WO2017111523A1 - Plating device and plating method - Google Patents
Plating device and plating method Download PDFInfo
- Publication number
- WO2017111523A1 WO2017111523A1 PCT/KR2016/015153 KR2016015153W WO2017111523A1 WO 2017111523 A1 WO2017111523 A1 WO 2017111523A1 KR 2016015153 W KR2016015153 W KR 2016015153W WO 2017111523 A1 WO2017111523 A1 WO 2017111523A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- steel sheet
- cooling
- plating
- steel plate
- knife
- Prior art date
Links
- 238000007747 plating Methods 0.000 title claims abstract description 305
- 238000000034 method Methods 0.000 title claims abstract description 57
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 328
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- 238000001816 cooling Methods 0.000 claims abstract description 291
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Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/14—Removing excess of molten coatings; Controlling or regulating the coating thickness
- C23C2/16—Removing excess of molten coatings; Controlling or regulating the coating thickness using fluids under pressure, e.g. air knives
- C23C2/18—Removing excess of molten coatings from elongated material
- C23C2/20—Strips; Plates
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/26—After-treatment
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
- C23C2/36—Elongated material
- C23C2/40—Plates; Strips
Definitions
- the present invention relates to a plating apparatus and a plating method for continuously plating a molten metal on a steel sheet surface.
- the technique of providing corrosion resistance is widely performed by plating a zinc type metal or a metal alloy on the surface of a steel plate. Based on the excellent corrosion resistance, the coated steel sheet is increasingly used for exterior construction materials such as home appliances, automobiles, shipbuilding, etc., which require beautiful surface management.
- Continuous Galvanizing Line is a facility for producing galvanized steel by attaching molten zinc to the surface of steel sheet.
- the steel sheet is plated in a plating port containing molten zinc while going through a sink roll disposed in the plating port.
- Molten zinc is attached to the steel plate through the sink roll is turned to the top of the plating port.
- the steel sheet drawn out of the galvanizing port is then made into a plated steel sheet through a process of adjusting the coating amount on the surface of the steel sheet and then cooling the plating layer.
- It provides a plating apparatus and plating method that can increase productivity and product quality while simplifying the process.
- the present invention provides a plating apparatus and a plating method that enable easier and precise control of the coating weight.
- a plating apparatus and a plating method that simplify the plating deposition amount control process and minimize the occurrence of plating defects that may occur during the plating deposition amount control process.
- a plating apparatus and a plating method that simplify the steel sheet cooling process and enable faster cooling.
- the present invention provides a plating apparatus and a plating method which can improve plating quality by minimizing plating adhesion amount and plating layer structure deviation of plated steel sheet.
- a plating apparatus and a plating method capable of manufacturing plated steel sheets of various compositions are provided.
- Plating bath for hot-dip steel plate a wiping part disposed on one side or both sides of the steel plate at the rear end of the plating bath along the steel plate traveling direction to control the plating adhesion amount of the steel plate, and one side of the steel plate at the rear end of the wiping part along the steel plate traveling direction
- a cooling unit disposed on both sides to cool the steel sheet, wherein the wiping unit contacts the plating layer on the surface of the steel sheet to control the plating amount, and supplies the cryogenic liquid including liquid nitrogen or liquid helium to the knife. It may include a refrigerant supply for cooling the knife.
- Plating bath for hot-dip steel plate a wiping part disposed on one side or both sides of the steel plate at the rear end of the plating bath along the steel plate traveling direction to control the plating adhesion amount of the steel plate, and one side of the steel plate at the rear end of the wiping part along the steel plate traveling direction
- a cooling unit disposed on both sides to cool the steel sheet, wherein the cooling unit is in contact with the plating layer on the surface of the steel sheet and at least one cooling body for cooling the plating layer, and the cryogenic liquid containing liquid nitrogen or liquid helium as the cooling body. It may include a refrigerant supply for supplying to cool the cooling body.
- Plating bath for hot-dip steel plate a wiping part disposed on one side or both sides of the steel plate at the rear end of the plating bath along the steel plate traveling direction to control the plating adhesion amount of the steel plate, and one side of the steel plate at the rear end of the wiping part along the steel plate traveling direction Or a cooling unit disposed on both sides to cool the steel sheet, wherein the wiping unit contacts the plating layer on the surface of the steel sheet to control the plating amount, and supplies the cryogenic liquid including liquid nitrogen or liquid helium to the knife.
- Refrigerant supply unit for cooling the knife The cooling unit is in contact with the plating layer on the surface of the steel plate at least one cooling body for cooling the plating layer, and supplying the cryogenic liquid containing liquid nitrogen or liquid helium to the cooling body to cool the cooling body It may include a refrigerant supply for cooling.
- the knife may include a body extending in the width direction of the steel sheet and having a mild cryogenic liquid therein, and a tip portion installed at the tip of the body and in contact with the plating layer of the steel sheet to control the plating amount.
- the knife may be cooled to a temperature of the tip portion -250 to 5 °C.
- the knife extends in the width direction of the steel plate and is rotatably installed therein, and a rotating body in which cryogenic liquid is circulated therein, and is disposed at intervals along the circumferential direction on the outer circumferential surface of the rotating body and in contact with the plating layer on the surface of the steel plate to control the plating amount. It may include a tip portion, and a rotary driving portion connected to the rotating body to rotate the rotating body to place one tip portion toward the steel plate surface.
- the tip portion may be detachably installed on the body or the rotating body.
- the wiping unit further includes a load sensor provided in the knife to detect a contact load of the tip portion with respect to the steel plate, and a control unit for controlling the pressing force against the steel sheet by moving the knife with respect to the steel plate according to the detection signal of the load sensor. It may include.
- the tip portion may be a structure disposed parallel to the width direction on the steel sheet.
- the tip portion may have a structure inclined with respect to the width direction of the steel sheet.
- the tip portion may be bent to form a V-shape or an inverted V-shape along the moving direction of the steel sheet.
- the wiping part may further include a chill roll extending from the rear end of the knife in the steel plate width direction along the moving direction of the steel plate to circulate the cryogenic liquid therein, to control the coating amount by closely contacting the plating layer on the surface of the steel plate, and to quench the steel plate. .
- the wiping unit further includes a load sensor provided in the chill roll to detect a contact load of the chill roll with respect to the steel sheet, and a control unit for controlling the pressing force of the chill roll against the steel sheet by moving the chill roll with respect to the steel sheet according to the detection signal of the load sensor. It may include.
- the wiping unit may further include a scraper in contact with the chill roll to remove contaminants attached to the chill roll surface.
- the cooling body includes a cooling roll extending in the width direction of the steel sheet and having a cryogenic liquid circulated therein and pressurized by a plating layer on the surface of the steel sheet to apply cold air, and the plurality of cooling rolls are arranged at intervals along the advancing direction of the steel sheet. It may be a structure.
- the cooling body may further include a cooling belt wound and installed between at least two cooling rolls to apply cold air in close contact with the plating layer on the surface of the steel sheet.
- the cooling belt may be a pattern to be transferred to the plating layer on the surface.
- the cooling belt may be a pattern to be transferred to the plating layer on the surface.
- the chill roll or cooling roll may be cooled to a temperature of -250 to 5 °C.
- the chill roll or cooling roll may have an average surface roughness of 0.1 to 3um.
- the cooling unit is provided on the cooling roll to control the pressing force of the cooling belt against the steel sheet by moving the cooling roll with respect to the steel sheet in accordance with the load sensor for detecting the contact load of the cooling belt to the steel sheet, and the detection signal of the load sensor
- the control unit may further include.
- the gap from the steel plate decreases as it goes from the knife to the cooling roll, thereby reducing the thickness of the plated layer of the steel plate.
- the plating method of the present embodiment includes a plating step of plating the steel sheet, an adjusting step of adjusting the plating adhesion amount of the steel sheet, and a cooling step of cooling the steel sheet, wherein the adjusting step comprises adjusting the plating deposition amount with a knife contacting the plating layer on the surface of the steel sheet.
- the step of adjusting first, and cooling the knife by supplying a cryogenic liquid containing liquid nitrogen or liquid helium to the knife.
- the plating method of the present embodiment includes a plating step of plating the steel sheet, an adjusting step of adjusting the plating adhesion amount of the steel sheet, and a cooling step of cooling the steel sheet, wherein the cooling step is cold air to the steel sheet with a cooling body in contact with the plating layer on the surface of the steel sheet. Cooling the steel sheet by adding a, and supplying a cryogenic liquid containing liquid nitrogen or liquid helium to the cooling body to cool the cooling body.
- the plating method of the present embodiment includes a plating step of plating the steel sheet, an adjusting step of adjusting the plating adhesion amount of the steel sheet, and a cooling step of cooling the steel sheet, wherein the adjusting step comprises adjusting the plating deposition amount with a knife contacting the plating layer on the surface of the steel sheet.
- the adjusting step comprises adjusting the plating deposition amount with a knife contacting the plating layer on the surface of the steel sheet.
- the adjusting step includes the steps of: cooling the steel sheet while secondly adjusting the plating adhesion amount with the chill roll which is in close contact with the plating layer on the surface of the steel sheet, and supplying the cryogenic liquid containing liquid nitrogen or liquid helium to the chill roll to cool the chill roll. It may further include.
- the adjusting step may further include detecting a contact load of the knife or chill roll on the steel sheet, and controlling the pressing force of the knife or chill roll on the steel sheet according to the detected contact load.
- the cooling step may further include detecting a contact load of the cooling body against the steel sheet, and controlling a pressing force of the cooling body against the steel sheet according to the detected contact load.
- the adjusting step and the cooling step may be a structure that gradually reduces the thickness of the plated layer of the steel sheet along the moving direction of the steel sheet.
- the tip portion of the knife can be maintained at a temperature of -250 to 5 °C.
- the chillol may be maintained at a temperature of -250 to 5 °C.
- the cooling body may be maintained at a temperature of -250 to 5 °C.
- the plated steel sheet may be quenched at a cooling rate of 20 ° C./sec or more.
- the plated steel sheet may be quenched to a temperature of 250 ° C. or less at a cooling rate of 20 ° C./sec or more.
- the method may further include using the exhaust gas by the liquid nitrogen used in the adjusting or cooling step as a reducing gas in the heat treatment furnace, an atmosphere maintaining gas of the cooling process.
- the method may further include transferring the pattern formed on the surface of the cooling body to the plating layer to form a pattern on the surface of the plating layer.
- the cooling gas does not come into contact with the steel sheet, thereby eliminating problems of generation of galvanized scattering, dross and noise caused by conventional gas injection.
- FIG. 1 is a schematic diagram showing a hot dip galvanizing apparatus according to the present embodiment.
- FIG. 2 is a schematic view showing a knife structure of the hot dip galvanizing apparatus according to the present embodiment.
- FIG 3 is a schematic view showing another embodiment of a knife of the hot dip galvanizing apparatus according to the present embodiment.
- FIG. 4 is a schematic view showing a contact load control structure for the steel sheet of the knife according to the present embodiment.
- FIG. 5 is a schematic view showing various embodiments of the tip structure of the knife and the arrangement structure with respect to the steel sheet according to the present embodiment.
- FIG. 6 is a schematic diagram showing the structure of a chill roll of a hot dip galvanizing apparatus according to the present embodiment.
- FIG. 7 to 8 are schematic views showing the cooling unit structure of the hot dip galvanizing apparatus according to the present embodiment.
- the present embodiment will be described by way of example a hot dip galvanizing apparatus for plating a zinc-based metal or a metal alloy on a steel sheet surface with a plating apparatus.
- the present plating apparatus is not limited to the plating of zinc-based metals or metal alloys, and is applicable to both hot dip plating apparatuses for various metals.
- FIG. 1 schematically shows a hot dip galvanizing apparatus according to the present embodiment.
- the plating apparatus of the present embodiment is a plating bath 10 for hot-dip steel plate (P), the steel plate is disposed on one side or both sides of the steel plate at the rear end of the plating bath 10 along the steel plate traveling direction Wiping part for controlling the plating deposition of the, and the cooling unit for cooling the steel sheet is disposed on one side or both sides of the steel plate at the rear end of the wiping portion along the steel plate traveling direction.
- P hot-dip steel plate
- the steel sheet P guided to the plating bath 10 is immersed in the molten metal while passing through a sink roll 12 disposed in the plating bath 10 to perform a hot dip plating process.
- the steel sheet P is moved in the direction of movement by the sink roll 12 to move above the plating bath 10.
- the steel plate P whose surface is plated by the molten metal in the plating bath 10 is drawn out to the upper portion of the plating bath 10.
- the steel sheet is made of a plated steel sheet via a wiping portion and a cooling portion that are sequentially disposed along a traveling direction.
- the steel sheet quenched through the cooling section proceeds to the process via the tension roll (14).
- the plating solution applicable in the present embodiment may be applied to both metal and alloy melts such as zinc and zinc alloys and aluminum and aluminum alloys, and may be applied without any limitation as long as the plating solution is metal and alloy.
- the wiping part is in direct contact with the plating layer attached to the surface of the steel sheet to have a structure for adjusting the plating adhesion amount.
- the wiping unit 20 contacts the plating layer on the surface of the steel sheet P to control the coating amount, and supplies the cryogenic liquid including liquid nitrogen or liquid helium to the knife 20 to supply the knife 20. It may include a refrigerant supply unit 50 for cooling).
- the coolant supply unit 50 cools the knife 20 to a cryogenic liquid, thereby lowering the temperature of the knife 20 so that the plating solution is fused to the knife 20 even when the knife 20 is in direct contact with the hot plating layer. Can be prevented.
- the cooling unit is configured to cool the steel sheet by directly contacting the plating layer on the surface of the steel sheet.
- the cooling unit cools the cooling body 60 to a cryogenic liquid, thereby lowering the temperature of the cooling body 60 so that the plating solution is fused to the cooling body 60 even when the cooling body 60 is in direct contact with the hot plating layer. Can be prevented.
- the refrigerant supply unit 50 is for supplying cryogenic liquid to the knife 20 or the cooling body 60, for example, a tank containing cryogenic liquid, a supply line for transporting cryogenic liquid, a supply installed on a supply line It may include a pump.
- the refrigerant supply unit 50 is applicable to all of the structural surface to supply the cryogenic liquid can be variously modified.
- cryogenic liquid used in the refrigerant supply unit 50 various liquids such as liquid argon may be used in addition to liquid nitrogen and liquid helium.
- liquid nitrogen can be more economical.
- the knife 20 and the cooling body 60 cooled by using the cryogenic liquid directly contact the steel sheet P to control and rapidly cool the plating amount of the steel sheet, thereby precisely adjusting the plating adhesion amount of the plated steel sheet through this embodiment. It can control and can raise the cooling rate of a plated steel plate to 20 degree-C / sec or more. Therefore, it is possible to significantly shorten the equipment line length for cooling the steel sheet and increase the product production speed.
- the cryogenic liquid supplied to the knife 20 or the cooling body 60 through the coolant supply unit 50 may be gasified by heat exchange with the plating layer while passing through the knife 20 or the cooling body 60.
- the gas discharged from the knife 20 or the cooling body 60 may be recycled by using a reducing gas in a heat treatment furnace of a steelmaking process or a gas for maintaining a non-oxidizing atmosphere in a cooling process through an appropriate filtration device. .
- FIG. 2 illustrates a specific structure of the knife according to the present embodiment.
- the knife 20 is disposed opposite to both sides of the steel sheet to adjust the deposition amount of the plating liquid on both sides of the steel sheet (P).
- Knife 20 disposed on both sides of the steel sheet (P) is made of the same structure, the following description will be described by way of example only a knife for one surface of the steel sheet.
- the knife 20 extends in the width direction of the steel plate P and has a body 22 in which a cryogenic liquid is gentle, and is installed at the tip of the body 22 and in contact with a plating layer of the steel plate.
- a cryogenic liquid is gentle
- the body 22 and the tip portion 24 are made of metal, ceramic, or ceramic coated metal such as stainless steel having excellent cryogenic durability, so that the body 22 and the tip portion 24 can be stably used in a cryogenic environment due to the use of liquid nitrogen. Can be prepared.
- the body 22 has a flow path 26 formed therein so that cryogenic liquid passes therethrough.
- the refrigerant supply unit 50 connected to the body 22 circulates and supplies the cryogenic liquid through the flow path 26.
- the flow path 26 extends to the tip where the tip 24 is positioned to sufficiently cool the tip 24 installed at the tip of the body 22, so that the cryogenic liquid can contact the tip 24.
- the tip part 24 may be detachably installed with respect to the body 22.
- the tip portion 24 keeps in contact with the hot plating layer and wears out. Accordingly, the tip portion 24 that is consumable can be replaced to replace the tip portion 24 in the body 22 when worn, so that the knife 20 can be continuously used.
- the tip portion 24 may have a structure that is pointed toward the tip for more precise plating deposition control.
- the cryogenic liquid supplied to the body 22 is circulated along the flow path 26 to cool the tip 24, thereby keeping the tip 24 at a low temperature. Accordingly, the tip part 24 may first control the plating adhesion layer more accurately while preventing the plating solution from being attached to the tip part 24 in the state in contact with the plating layer.
- Knife according to the embodiment of Figure 3 has a structure having a plurality of tips to be used immediately to replace the tip portion.
- the knife 21 of the present embodiment extends in the width direction of the steel sheet and is rotatably installed therein and a space along the circumferential direction on the outer circumferential surface of the rotating body 23 and the outer surface of the rotating body 23 circulating cryogenic liquid.
- the tip part 24 which is installed in contact with the plated layer on the surface of the steel sheet P and controls the plating amount, and is connected to the rotating body 23 to rotate the rotating body 23 so that the one side tip part 24 faces the steel plate surface. It may include a rotation driving unit to be disposed.
- the tip part 24 is immediately moved by rotating the rotating body 23 to separate the tip part 24 in use from the steel plate and moving the other tip part 24 in the air toward the steel plate. It can be replaced.
- four tip parts 24 may be disposed at an angle of 90 degrees along the outer circumferential surface of the rotating body 23. As a result, the rotating body 23 is rotated at an angle of 90 degrees to move each tip portion 24 toward the steel plate surface.
- the number of installation of the tip portion 24 can be variously modified.
- the rotating body 23 may have a cylindrical shape.
- the rotating body 23 is not limited to a cylindrical shape, for example, may have a structure in which the above-mentioned body 22 is continuously disposed at an angle along the outer circumferential surface of the rotating shaft. Both ends of the rotating body 23 may be rotatably supported by a separate support (not shown) on the installation.
- the rotating body 23 may also be made of metal, ceramic, or ceramic coated metal material having excellent cryogenic durability such that it can be stably used for a long time in a cryogenic environment due to the use of liquid nitrogen.
- the rotating body 23 is formed with a flow path (not shown) so that the cryogenic liquid passes therein.
- the flow path formed inside the rotating body 23 may be connected to the refrigerant supply unit 50 through both ends of the rotating shaft of the rotating body 23.
- the cryogenic liquid supplied from the coolant supply unit 50 is circulated and supplied to the flow path inside the rotor 23 through the tip of the rotor 23.
- the flow path is formed to extend to the surface on which the tip portion 24 is located to sufficiently cool the tip portion 24 installed on the outer circumferential surface of the rotating body 23 to allow the cryogenic liquid to contact the tip portion 24.
- a tip portion 24 is installed along the axial direction on the surface of the rotating body 23.
- the tip part 24 may be detachably installed on the surface of the rotating body 23.
- the rotation driving unit is applicable to all of the structural surface to rotate the rotating body 23 by a predetermined angle.
- the rotating shaft may include a step motor 27 connected to the rotating body 23 and the driving belt 25 to transmit power.
- the step motor 27 is rotated by a predetermined amount, power is transmitted to the rotating body 23 through the driving belt 25 so that the rotating body 23 is rotated by the disposition interval of the tip portion 24.
- the new tip portion 24 provided on the rotor 23 surface in the air moves toward the steel sheet and contacts the plating layer on the steel sheet surface.
- the tip portion 24 that is worn or abnormal according to the rotation of the rotor 23 is spaced outward from the steel plate surface is moved to the standby position.
- the worn tip 24 is processed through a replacement or surface polishing operation in the standby position.
- the time required for replacing the tip portion 24 can be reduced and the work can be continuously performed.
- the knives 20 and 21 may circulate the cryogenic liquid therein to cool the tip portion 24 to -250 to 5 ° C.
- the temperature of the tip part 24 is higher than 5 ° C., a problem arises in that the hot plating solution is attached to the tip part 24.
- the temperature of the tip portion 24 is lower than ⁇ 250 ° C., low temperature brittle fracture of the tip portion 24 occurs.
- the knives 20 and 21 are moved relative to the steel plate to precisely control the amount of plating deposition by the tip portion 24 by varying the distance from the steel plate.
- the gap between the tip portion 24 and the steel sheet P is changed to control the plating adhesion amount of the steel sheet.
- the interval between the tip portion 24 and the steel sheet P can be confirmed through the contact load of the tip portion detected through the load sensor 30.
- the tip portion 24 deeply enters the plating layer of the steel sheet, and the contact load increases as the amount of contact with the plating solution increases, whereas the tip portion 24 becomes the steel sheet P.
- spaced apart from decreases the contact load with the plating solution.
- the controller 32 controls the plating amount by calculating the detection value of the load sensor 30 by moving the knife 20 with respect to the steel plate P according to the plating amount set primarily.
- Movement of the knife 20 relative to the steel sheet may be made through, for example, a driving unit 34 such as a driving cylinder coupled to the knife 20.
- the drive unit 34 may be used a variety of power sources such as a drive cylinder or a motor, it is possible to apply both of the structural surface to move the knife 20 in a straight line with respect to the steel sheet.
- control unit 32 may detect the change in the measured value of the load sensor 30, and determine whether there is a device abnormality. When determining the abnormality of the device, it is possible to immediately take the necessary measures, such as replacing the tip portion 24 in the knife 20.
- FIG 5 illustrates the shape of the tip portion of the knife with respect to the steel plate and the arrangement of the tip portion with respect to the steel plate.
- the tip portion 24 installed in the knife 20, 21 may be formed in a variety of structures, such as a straight form, or a bent in the middle to form a V-shape.
- the body 22 or the rotating body 23 of the knife in which the tip part 24 is installed may also have the same structure as that of the tip part 24.
- the body 22 of the knife 20 on which the tip portion 24 is installed may also have a V shape having the same shape as the tip portion 24. .
- the tip portion 24 may be disposed parallel to the steel plate P with respect to the width direction.
- the tip portion 24 may be disposed to be inclined with respect to the width direction of the steel sheet.
- the bent portion may be disposed in an inverted V shape or in a V shape so that the bent portion faces the moving direction of the steel plate or faces the moving direction of the steel plate. Can be.
- the wiping portion is disposed at the rear end of the knife 20 along the steel plate traveling direction to more precisely control the plating deposition amount of the steel sheet and to rapidly cool the plating layer of the steel sheet 40 It may further include.
- the chill roll 40 is a roll structure that is disposed in the width direction of the steel sheet and is in close contact with the plating layer. Both ends of the chill roll 40 may be rotatably supported by a separate support (not shown) on the installation.
- the chill roll 40 may be freely rotatable and may be rotated according to the movement of the steel sheet or may be rotated at a set speed by being connected to a separate driving source.
- the chill roll 40 may have an average surface roughness of 0.1 to 3um.
- the surface roughness of the chill roll 40 is higher than 3um, a non-uniform after-treatment problem occurs due to poor surface quality. If the surface roughness of the chill roll 40 is lower than 0.1um, there is a problem that post-treatment characteristics such as chemical conversion are lowered.
- the chill roll 40 has a structure in which the cryogenic liquid is circulated inside and cooled to a low temperature.
- the chill roll 40 may be made of metal, ceramic, or ceramic coated metal material having excellent cryogenic durability such that it can be stably used for a long time in a cryogenic environment due to the use of liquid nitrogen.
- a flow path is formed in the chill roll 40 to allow cryogenic liquid to pass.
- the flow path formed in the chill roll 40 may be connected to the refrigerant supply unit (see 50 of FIG. 1) through both ends of the rotation shaft of the chill roll 40.
- the cryogenic liquid supplied from the coolant supply unit 50 is circulated and supplied to the flow path inside the chill roll 40 through the tip of the chill roll 40.
- the surface of the chill roll 40 is maintained at a low temperature by the cryogenic liquid supplied into the chill roll 40.
- the chill roll 40 prevents the plating solution from adhering to the surface of the chill roll 40 in a state of being in contact with the plating layer of the steel sheet P, and rapidly cools the plating layer.
- the chill roll 40 is pressed in close contact with the plating layer on the surface of the steel sheet (P) to control the plating deposition amount of the steel sheet in which the plating deposition amount is primarily controlled while passing through the knife 20.
- the chill roll 40 is capable of rapidly cooling the plating layer through direct heat exchange with the steel sheet in a state of being in close contact with the steel plate plating layer.
- the chill roll 40 may circulate the cryogenic liquid therein to cool the temperature to -250 to 5 ° C.
- the temperature of the chill roll 40 is higher than 5 ° C., the cooling performance and the surface quality improvement efficiency of the coated steel sheet are deteriorated.
- the chill roll 40 has a temperature lower than ⁇ 250 ° C., low temperature brittle fracture of the chill roll 40 occurs.
- the plating apparatus of the present embodiment can more precisely control the plating adhesion amount and adjust the thickness of the plating layer through the low temperature knife 20 and the chill roll 40 in contact with the plating solution on the surface of the steel sheet.
- the chill roll (40) cooled to a low temperature pressurizes the plating layer and rapidly cools the microstructure of the plating layer, thereby making it possible to obtain a small and uniform surface solidification structure, and to effectively reduce the plating deposition amount variation and the plating layer structure variation in the width direction. do.
- the plating apparatus can quench the steel sheet at a cooling rate of 20 ° C / sec.
- the chill roll 40 can improve the plating performance even for the non-plated steel type because the cooling proceeds while pressing the plating layer under a predetermined pressure.
- the sink roll 12 and the chill roll 40 of the plating bath 10 are interlocked to support the steel sheet P so that the steel sheet passes through the contact knife 20 in the width direction. Bending does not occur at all. That is, the steel sheet passes through the sink roll 12 and the chill roll 40 at the front end and the rear end of the knife 20 in the steel plate moving direction, respectively. Thus, the steel sheet P passes through the knife 20 without the occurrence of the bending phenomenon in the flattened state by the sink roll 12 and the chill roll 40.
- the plating adhesion amount deviation in the width direction occurs, and plating surface defects such as comb defects due to side over plating occur.
- plating surface defects frequently occur due to the bending of the steel sheet, but in the present embodiment, by preventing bending of the steel sheet, it is possible to manufacture a coated steel sheet having almost no plating deposition amount and plating layer structure deviation in the width direction. .
- the wiping part of the present embodiment is provided on the chill roll 40 like a knife for precise control of the plating adhesion amount by the chill roll 40 and detects a contact load of the chill roll 40 against the steel sheet.
- a control unit 32 for controlling the pressing force of the chill roll 40 against the steel sheet by moving the chill roll 40 with respect to the steel sheet by operating the driving unit 34 according to the detection signal of the load sensor.
- the gap between the chill roll 40 and the steel sheet is changed to precisely control the plating adhesion amount of the steel sheet and the thickness of the plating layer.
- the structure of the load sensor and the control unit for the chill roll 40 is the same as that of the load sensor 30 and the control unit 32 and the drive unit 34 for the knife 20 mentioned above, and the same reference numerals are used, and the structure thereof. And the action refers to the description of the load sensor 30 and the control unit 32 for the knife 20, the detailed description thereof will be omitted.
- the control unit 32 may calculate the detection value of the load sensor 30 to move the chill roll 40 against the steel sheet to press the plating layer, thereby more precisely controlling the amount of plating and the thickness of the plating layer accordingly.
- the plating layer is pressed by the chill roll and quenched at a cooling rate of 20 ° C./sec or more, it is possible to obtain a plating layer having a finer structure while minimizing the variation in the width direction plating amount.
- the wiping unit is configured to remove contaminants on the surface of the chill roll 40 in case the surface of the chill roll 40 is contaminated.
- the wiping unit may further include a scraper 44 in contact with the chill roll 40 to remove contaminants attached to the surface of the chill roll 40.
- the scraper 44 may be installed to extend in the axial direction of the chill roll 40 to contact the surface of the chill roll 40. As a result, as the chill roll 40 is rotated, contaminants attached to the chill roll 40 surface are caught by the scraper 44 and removed from the chill roll 40 surface.
- the coating amount is precisely adjusted and quenched through the wiping part.
- the steel sheet is rapidly cooled below the set temperature while passing through the cooling unit disposed at the rear end of the wiping unit, and the thickness of the plating layer is precisely controlled.
- FIG 7 and 8 illustrate the structure of the cooling unit according to the present embodiment.
- the cooling unit adheres to the plating layer on the surface of the steel sheet to supply at least one cooling body 60 to cool the plating layer, and to supply the cryogenic liquid including liquid nitrogen or liquid helium to the cooling body 60 to supply the cooling body 60. It may include a refrigerant supply unit 50 for cooling.
- the cooling body 60 may include a cooling roll 62 extending in the width direction of the steel sheet and having a cryogenic liquid circulated therein and pressurized to the plating layer on the surface of the steel sheet P to apply cold air.
- the cooling rolls 62 may have a structure in which a plurality of cooling rolls 62 are arranged in multiple stages at intervals along a traveling direction of the steel sheet.
- the cooling roll 62 is a roll structure that is disposed in the width direction of the steel sheet similarly to the chill roll 40. Both ends of the cooling roll 62 may be rotatably supported by a separate support (not shown) on the installation.
- the cooling roll 62 may be freely rotatable and may be rotated according to the movement of the steel sheet or may be rotated at a set speed by being connected to a separate driving source.
- the cooling roll 62 has a structure in which the cryogenic liquid is circulated and cooled to low temperature.
- the cooling roll 62 has a flow path 64 formed therein to allow the cryogenic liquid to pass therethrough.
- the flow path 64 formed in the cooling roll 62 may be connected to the refrigerant supply unit (see 50 of FIG. 1) through both ends of the rotation shaft of the cooling roll 62.
- the cryogenic liquid supplied from the coolant supply unit 50 is circulated and supplied to the flow path 64 inside the cooling roll 62 through the tip of the cooling roll 62.
- the surface of the cooling roll 62 is maintained at a low temperature by the cryogenic liquid supplied into the cooling roll 62.
- the cooling body 60 may further include a cooling belt 66 that is wound and installed between at least two cooling rolls 62 and presses and adheres to the plating layer on the surface of the steel sheet P to apply cold air.
- the cooling belt 66 not the cooling roll 62, is in direct contact with the plated layer of the steel sheet.
- the cooling roll 62 and the cooling belt 66 are metal, ceramic, or ceramic coated metal such as stainless steel having excellent cryogenic durability, so that the cooling roll 62 and the cooling belt 66 can be stably used in a cryogenic environment due to the use of liquid nitrogen. Or the like.
- the cooling roll 62 or the cooling belt 66 in contact with the surface of the steel sheet may have an average surface roughness of 0.1 to 3um. If the surface roughness of the cooling roll 62 or the cooling belt 66 is higher than 3um, non-uniform after-treatment problems may occur due to poor surface quality, and if the surface roughness is lower than 0.1um, post-treatment such as chemical conversion The problem that a characteristic falls is produced.
- the cooling belts 66 are wound around the two cooling rolls 62 to form one cooling body 60, and one or more of these cooling bodies 60 are disposed at intervals along the advancing direction of the steel sheet. Structure. Installation intervals and the number of the respective cooling bodies 60 can be variously modified depending on the facilities and process conditions.
- Each of the cooling bodies 60 may have the same structure, and the structure of one cooling body will be described below as an example.
- the cooling belt 66 is wound around the two cooling rolls 62 spaced apart from each other, and the cooling belt 66 is in surface contact with the plating layer on the surface of the steel sheet.
- the cooling belt 66 may be rotated according to the moving speed of the steel sheet by, for example, the rotational drive of the cooling roll 62 in contact with the steel sheet. By rotating the cooling belt 66 in accordance with the moving speed of the steel sheet, it is possible to minimize the friction between the steel sheet and the cooling belt 66 and to prevent the plating layer damage due to the friction.
- the cooling roll 62 cools the provided cooling belt 66 to a low temperature.
- the cooling belt 66 is in surface contact with the plating layer in a state of being cooled to a low temperature by the cooling roll 62, so that the plating layer can be rapidly cooled. That is, the cooling belt 66 is in surface contact with the plated layer on the surface of the steel sheet between the two cooling rolls (62).
- the cooling unit of the present embodiment can increase the cooling area for the steel plate plated layer through the cooling belt 66 to increase the cooling rate.
- the cooling roll 62 may circulate the cryogenic liquid therein to cool the temperature of the cooling belt 66 in contact with the plating layer to -250 to 5 ° C.
- the temperature of the cooling belt 66 is higher than 5 °C causes a problem that the cooling performance and surface quality improvement efficiency of the coated steel sheet is lowered.
- the temperature of the cooling belt 66 is lower than -250 °C problem of low temperature brittle fracture of the cooling belt 66 occurs.
- the cooling belt 66 provided on the cooling roll 62 contacts the plating layer and rapidly solidifies the plating solution within a faster time, so that the plating apparatus of the present embodiment cools the steel sheet through the cooling section at a cooling rate of 20 ° C / sec. It can be quenched to the temperature below 250 degreeC.
- the cooling unit may tension the cooling belt 66 by adjusting a gap between two cooling rolls 62 constituting the unit. As the cooling belt 66 is tensioned and unfolded, the plating layer on the surface of the steel sheet and the cooling belt 66 are in contact with each other and the pressing force is uniform, and the plated layer can be pressure-cooled more evenly.
- a driving cylinder 68 may be installed between the cooling rolls 62 between the two cooling rolls 62 in which the cooling belt 66 is wound.
- the driving cylinder 68 is driven in accordance with the signal of the control unit 32 to be separated between the cooling roll 62. As the gap between the cooling rolls 62 opens, the cooling belt 66 is stretched taut.
- the cooling roll 62 can precisely adjust the pressing force on the plated layer of the steel sheet.
- the cooling roll 62 is not shown, but may be provided with a load sensor, a control unit and a driving unit in the same manner as the chill roll 40.
- the pressing force adjusting structure of the cooling roll is the same as the structure of the load sensor 30 and the control unit 32 and the driving unit 34 for the chill roll 40 mentioned above, and a detailed description thereof will be omitted.
- the cooling roll is pressed tightly to the cooling belt at a set pressure to precisely control the thickness of the plated layer of the steel sheet.
- the cooling unit calculates the detection value of the load sensor to move the cooling roll 62 with respect to the steel sheet to precisely adjust the plated layer pressing force by the cooling belt 66, thereby precisely controlling the thickness of the plated layer. .
- the pressing force of the cooling belt 66 according to the movement of the cooling roll 62 may be the same or different for each of the plurality of cooling bodies 60 arranged along the moving direction of the steel sheet. That is, each of the cooling bodies 60 arranged along the moving direction of the steel sheet may be in close contact with the steel sheet with the same pressing force. Alternatively, the cooling bodies 60 may be in close contact with the steel sheet by gradually increasing the pressing force along the moving direction of the steel sheet. In the case of such a structure, the steel sheet receives a progressively high pressing force while passing through each cooling body 60 to gradually reduce the thickness of the plating layer.
- the thickness of the plating layer may be gradually reduced by going from the knife 20 to the cooling unit along the moving direction of the steel sheet, thereby more precisely controlling the plating layer thickness.
- the cooling unit can improve the plating performance even for non-plated steel grades.
- the cooling unit may finally control the surface roughness of the steel plate plating layer through a cooling roll or a cooling belt disposed at the end of the rear end in the traveling direction of the steel sheet. Thus, higher quality products can be produced.
- the plating apparatus of the present embodiment can rapidly cool the plating layer in comparison with the prior art by closely cooling the cooling belt cooled by the cryogenic liquid to the plating layer.
- Plated steel sheet cooling has a direct impact on the surface quality of the product. If the uncondensed plating layer comes in contact with contaminated gas or rolls in the rear of the installation, the plating layer must be completely solidified before entering the rear of the installation, as this causes direct surface defects.
- the heat capacity is low, the cooling capacity is lowered, and in order to cool the plated steel sheet below a certain temperature to completely solidify the plated layer required a very long multi-stage cooling line.
- the cooling line is considerably complicated and the size of the facility is so large that it is difficult to effectively manage the facility, so that surface defects are frequently generated.
- the difference between the solidification start temperature and the solidification completion temperature of the plating layer is large, such as an alloy plated steel sheet in which a large amount of Al and Mg are added to the Zn plating solution, it is difficult to obtain a sufficient cooling effect using a conventional gas method. Accordingly, the cooling of the plating layer is not properly performed, and a coarse and fragile plating layer structure containing Al and Mg, which is a strong oxidizing metal, is generated. In this region, plating layer surface bonding such as black spots and black edges occurs, and problems of plating layer cracking and deterioration of corrosion resistance are generated. Will cause.
- the cooling belt 66 directly contacts the plating layer of the steel sheet, thereby applying the cooling ability by the cryogenic liquid to the plating layer, thereby further increasing the cooling efficiency.
- the time required for cooling the plating layer can be greatly shortened. Therefore, according to the present embodiment, the cooling rate of the plated steel sheet is increased to 20 ° C./sec or more, thereby further reducing the facility line of the cooling unit.
- gas is not directly in contact with the steel sheet, it is possible to minimize the occurrence of surface defects, and to obtain a smaller and more uniform surface structure, thereby manufacturing a high quality coated steel sheet.
- the cooling belt 66 may have a structure formed by stamping a pattern on the plating layer in the process of pressing and cooling the plating layer of the plated steel sheet.
- the pattern may mean a repetitive pattern or pattern.
- the surface of the plated layer may be processed through a structure in which various patterns are formed on the cooling belt and transferred.
- the cooling belt 66 may be a pattern to be transferred to the plating layer on the surface.
- the steel plate coated with molten zinc through the plating bath is moved to the upper portion of the plating bath to manufacture a plated steel sheet through a process of adjusting the plating adhesion amount of the steel plate and a process of cooling the steel plate.
- the steel sheet coming out of the plating bath is primarily controlled by the low temperature knife contacting the plating layer on the surface of the steel sheet. Then, the plating deposition amount is secondarily controlled by the low temperature chill roll in contact with the steel plate surface plating layer at the rear end of the knife.
- the coating amount adjustment by the knife and the chill roll can be precisely controlled by detecting the contact load between the knife and the chill roll with respect to the steel sheet, and controlling the pressing force by moving the knife and the chill roll with respect to the steel sheet in accordance with the detected contact load.
- the knife and chill roll are cooled to a low temperature by supplying a cryogenic liquid such as liquid nitrogen.
- the tip portion provided to the knife is cooled to a temperature of 5 ° C or lower by the cryogenic liquid supplied to the knife.
- the plating solution is not fused to the tip portion cooled to a low temperature in a state in which the tip portion contacts the plating layer to adjust the plating deposition amount. Therefore, the knife can accurately control the plating adhesion amount of the plating layer in a state where the tip portion is in physical contact with the plating layer. In this way, the plated amount of the plated layer of the steel sheet from the plating bath is controlled by the knife.
- the chill roll primarily contacts the plating layer of the steel sheet whose deposition amount is controlled by the knife and physically pressurizes the plating layer, thereby controlling the plating deposition amount more precisely.
- the chill roll is also cooled to low temperature by the cryogenic liquid supplied therein, so that the surface of the chill roll in contact with the plating layer is cooled to 5 ° C or lower.
- the plating solution does not adhere to the chill roll surface in the state where the chill roll is pressed against the plating layer and pressed. Therefore, by pressing the chill roll on the plating layer, it is possible to precisely control the plating adhesion amount of the plating layer, and to adjust the thickness of the plating layer of the steel sheet.
- the plated layer of the steel sheet is rapidly cooled by a chilled chill roll while the steel sheet is pressed by the chill roll to control the coating amount.
- the chill roll is rapidly cooled as the plating layer in contact with the chill roll heats up with the chill roll while being cooled by the cryogenic liquid as mentioned. In this way, the chill roll is in contact with the plating layer to cool the plating layer, the plated steel sheet can be quenched at a cooling rate of 20 ° C / sec or more.
- the steel sheet rapidly cooled while passing through the chill roll is quenched below a set temperature while passing through a cooling section disposed at the rear end of the chill roll.
- a plurality of units including a cooling roll and a cooling belt are continuously arranged as the cooling body, and the cooling belt of each unit is pressed against the plated layer on the surface of the steel sheet.
- the chill roll like the chill roll, is supplied with a cryogenic liquid such as liquid nitrogen to the inside, and cooled to a low temperature. Cold air of the cooling roll is applied to the plating layer through the cooling belt to quench the plating layer.
- a cryogenic liquid such as liquid nitrogen
- the cooling belt is cooled to low temperature by the cryogenic liquid so that the plating layer is not attached to the cooling belt while the cooling belt is pressed against the plating layer.
- the cooling belt cools the plating layer in a state in which the plating layer of the steel sheet is pressed at an appropriate pressure. Adjusting the pressing force of the cooling belt with respect to the steel sheet can detect the contact load of the cooling belt with respect to the steel sheet, and move the cooling belt with respect to the steel sheet according to the detected contact load to precisely control the pressing force.
- the plated steel sheet subjected to the chill roll may be cooled by a cooling belt while passing through a cooling section, and may be quenched to a temperature of 250 ° C. or less at a cooling rate of 20 ° C./sec or more.
- the thickness of the steel sheet is gradually reduced along the moving direction of the steel sheet, so that the thickness of the steel sheet can be more precisely controlled. do.
- Liquid nitrogen may be gasified in the process of adjusting the coating weight and cooling the plating layer, and the exhaust gas generated in this process may be reduced gas in the furnace or gas for maintaining the atmosphere of the plating steel plate cooling process after filtration. Can be recycled.
- a pattern may be formed on the surface of the plated layer of the plated steel sheet.
- the pattern formed on the surface of the cooling belt presses the plated layer.
- the pattern formed on the surface of the cooling belt is transferred to the plating layer as it is, the same pattern as the pattern formed on the surface of the cooling belt is formed on the surface of the plating layer.
- a pattern having a desired shape may be formed on the surface of the plated steel sheet.
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Abstract
A plating device is provided in order to enable a simplified process and increase productivity and product quality, the plating device comprising: a plating bath for hot-dipping a steel sheet; a wiping part disposed on the rear-end of the plating bath on one surface or both surfaces of the steel sheet along the progressing direction of the steel sheet so as to control the amount of plating attached to the steel sheet; and a cooling part disposed on the rear-end of the wiping part on one surface or both surfaces of the steel sheet along the progressing direction of the steel sheet in order to cool the steel sheet, wherein the wiping part comprises a knife and a refrigerant supply part, the knife making contact with the plating layer on the surface of the steel sheet so as to control the plating attachment amount, and the refrigerant supply part cooling the knife by supplying, to the knife, a cryogenic liquid including liquid nitrogen or liquid helium.
Description
본 발명은 강판 표면에 용융 금속을 연속으로 도금하는 도금 장치와 도금 방법을에 관한 것이다.The present invention relates to a plating apparatus and a plating method for continuously plating a molten metal on a steel sheet surface.
강판의 표면에 아연계의 금속이나 금속 합금을 도금하는 것에 의해 내식성을 부여하는 기술이 폭넓게 행해지고 있다. 도금 강판은 우수한 내식성을 바탕으로 일반 건축자재를 비롯하여 미려한 표면 관리가 요구되는 가전 제품, 자동차, 조선 등의 외판재까지 점점 그 사용 범위가 확대되고 있는 실정이다.The technique of providing corrosion resistance is widely performed by plating a zinc type metal or a metal alloy on the surface of a steel plate. Based on the excellent corrosion resistance, the coated steel sheet is increasingly used for exterior construction materials such as home appliances, automobiles, shipbuilding, etc., which require beautiful surface management.
용융아연 도금설비(CGL;Continuous Galvanizing Line)는 강판 표면에 용융 아연을 부착하여 도금강판을 생산하는 설비이다. 용융아연 도금설비에서 강판은 도금포트 내에 배치된 싱크롤(sink roll)을 거치면서 용융 아연이 수용된 도금포트에 담겨져 도금이 이루어진다. Continuous Galvanizing Line (CGL) is a facility for producing galvanized steel by attaching molten zinc to the surface of steel sheet. In the hot-dip galvanizing equipment, the steel sheet is plated in a plating port containing molten zinc while going through a sink roll disposed in the plating port.
용융 아연이 부착된 강판은 싱크롤을 지나 방향이 전환되어 도금포트 상부로 나오게 된다. 아연도금포트에서 인출된 강판은 이후 강판 표면에서 도금 부착량을 조절하는 공정을 거친 후 도금층을 냉각하는 공정을 거쳐 도금강판으로 제조된다.Molten zinc is attached to the steel plate through the sink roll is turned to the top of the plating port. The steel sheet drawn out of the galvanizing port is then made into a plated steel sheet through a process of adjusting the coating amount on the surface of the steel sheet and then cooling the plating layer.
최근에 다양한 업체에서 도금강판을 양산하고 있는 실정으로, 제품 경쟁력을 보다 높일 수 있도록, 도금 공정을 단순화하면서 도금 품질을 높일 수 있는 차별화된 기술의 개발이 요구된다. Recently, various companies have been mass-producing plated steel sheets. In order to enhance product competitiveness, it is required to develop differentiated technologies that can improve plating quality while simplifying the plating process.
공정을 단순화하면서 생산성 및 제품의 품질을 높일 수 있는 도금 장치 및 도금 방법을 제공한다.It provides a plating apparatus and plating method that can increase productivity and product quality while simplifying the process.
도금 부착량을 보다 쉽게 정밀 제어할 수 있도록 된 도금 장치 및 도금 방법을 제공한다.The present invention provides a plating apparatus and a plating method that enable easier and precise control of the coating weight.
도금 부착량 제어 공정을 단순화시키고, 도금 부착량 제어 공정시 발생될 수 있는 도금 결함 발생을 최소화할 수 있는 도금 장치 및 도금 방법을 제공한다.Provided are a plating apparatus and a plating method that simplify the plating deposition amount control process and minimize the occurrence of plating defects that may occur during the plating deposition amount control process.
강판 냉각 공정을 단순화시키고 보다 신속하게 냉각을 수행할 수 있도록 된 도금 장치 및 도금 방법을 제공한다.Provided are a plating apparatus and a plating method that simplify the steel sheet cooling process and enable faster cooling.
도금 강판의 도금 부착량이나 도금층 조직 편차를 최소화하여 도금 품질을 높일 수 있도록 된 도금 장치 및 도금 방법을 제공한다.The present invention provides a plating apparatus and a plating method which can improve plating quality by minimizing plating adhesion amount and plating layer structure deviation of plated steel sheet.
다양한 조성의 도금강판 제조가 가능한 도금 장치 및 도금 방법을 제공한다.Provided are a plating apparatus and a plating method capable of manufacturing plated steel sheets of various compositions.
이를 위해 본 구현예의 도금 장치는,To this end, the plating apparatus of the present embodiment,
강판을 용융 도금하는 도금 욕조, 강판 진행방향을 따라 상기 도금 욕조 후단에서 강판의 일면 또는 양면에 배치되어 강판의 도금 부착량을 제어하는 와이핑부, 및 강판 진행방향을 따라 상기 와이핑부 후단에서 강판의 일면 또는 양면에 배치되어 강판을 냉각시키기 위한 냉각부를 포함하고, 상기 와이핑부는 강판 표면의 도금층에 접촉하여 도금 부착량을 제어하는 나이프, 및 상기 나이프로 액체 질소나 액체 헬륨을 포함하는 극저온 액체를 공급하여 나이프를 냉각하는 냉매공급부를 포함할 수 있다.Plating bath for hot-dip steel plate, a wiping part disposed on one side or both sides of the steel plate at the rear end of the plating bath along the steel plate traveling direction to control the plating adhesion amount of the steel plate, and one side of the steel plate at the rear end of the wiping part along the steel plate traveling direction Or a cooling unit disposed on both sides to cool the steel sheet, wherein the wiping unit contacts the plating layer on the surface of the steel sheet to control the plating amount, and supplies the cryogenic liquid including liquid nitrogen or liquid helium to the knife. It may include a refrigerant supply for cooling the knife.
본 구현예의 도금 장치는,Plating apparatus of this embodiment,
강판을 용융 도금하는 도금 욕조, 강판 진행방향을 따라 상기 도금 욕조 후단에서 강판의 일면 또는 양면에 배치되어 강판의 도금 부착량을 제어하는 와이핑부, 및 강판 진행방향을 따라 상기 와이핑부 후단에서 강판의 일면 또는 양면에 배치되어 강판을 냉각시키기 위한 냉각부를 포함하고, 상기 냉각부는 강판 표면의 도금층에 밀착하여 도금층을 냉각하는 적어도 하나 이상의 냉각체, 및 상기 냉각체로 액체 질소나 액체 헬륨을 포함하는 극저온 액체를 공급하여 냉각체를 냉각하는 냉매공급부를 포함할 수 있다.Plating bath for hot-dip steel plate, a wiping part disposed on one side or both sides of the steel plate at the rear end of the plating bath along the steel plate traveling direction to control the plating adhesion amount of the steel plate, and one side of the steel plate at the rear end of the wiping part along the steel plate traveling direction Or a cooling unit disposed on both sides to cool the steel sheet, wherein the cooling unit is in contact with the plating layer on the surface of the steel sheet and at least one cooling body for cooling the plating layer, and the cryogenic liquid containing liquid nitrogen or liquid helium as the cooling body. It may include a refrigerant supply for supplying to cool the cooling body.
본 구현예의 도금 장치는,Plating apparatus of this embodiment,
강판을 용융 도금하는 도금 욕조, 강판 진행방향을 따라 상기 도금 욕조 후단에서 강판의 일면 또는 양면에 배치되어 강판의 도금 부착량을 제어하는 와이핑부, 및 강판 진행방향을 따라 상기 와이핑부 후단에서 강판의 일면 또는 양면에 배치되어 강판을 냉각시키기 위한 냉각부를 포함하고, 상기 와이핑부는 강판 표면의 도금층에 접촉하여 도금 부착량을 제어하는 나이프, 및 상기 나이프로 액체 질소나 액체 헬륨을 포함하는 극저온 액체를 공급하여 나이프를 냉각하는 냉매공급부를 포함하고,상기 냉각부는 강판 표면의 도금층에 밀착하여 도금층을 냉각하는 적어도 하나 이상의 냉각체, 및 상기 냉각체로 액체 질소나 액체 헬륨을 포함하는 극저온 액체를 공급하여 냉각체를 냉각하는 냉매공급부를 포함할 수 있다.Plating bath for hot-dip steel plate, a wiping part disposed on one side or both sides of the steel plate at the rear end of the plating bath along the steel plate traveling direction to control the plating adhesion amount of the steel plate, and one side of the steel plate at the rear end of the wiping part along the steel plate traveling direction Or a cooling unit disposed on both sides to cool the steel sheet, wherein the wiping unit contacts the plating layer on the surface of the steel sheet to control the plating amount, and supplies the cryogenic liquid including liquid nitrogen or liquid helium to the knife. Refrigerant supply unit for cooling the knife, The cooling unit is in contact with the plating layer on the surface of the steel plate at least one cooling body for cooling the plating layer, and supplying the cryogenic liquid containing liquid nitrogen or liquid helium to the cooling body to cool the cooling body It may include a refrigerant supply for cooling.
상기 나이프는 강판 폭방향으로 연장되고 내부에는 극저온 액체가 순한되는 바디, 및 상기 바디 선단에 설치되고 강판의 도금층에 접촉하여 도금 부착량을 제어하는 팁부를 포함할 수 있다.The knife may include a body extending in the width direction of the steel sheet and having a mild cryogenic liquid therein, and a tip portion installed at the tip of the body and in contact with the plating layer of the steel sheet to control the plating amount.
상기 나이프는 팁부가 -250 내지 5℃의 온도로 냉각될 수 있다. The knife may be cooled to a temperature of the tip portion -250 to 5 ℃.
상기 나이프는 강판 폭방향으로 연장되고 회전가능하게 설치되며 내부에는 극저온 액체가 순환되는 회전체와, 상기 회전체 외주면에 원주방향을 따라 간격을 두고 설치되고 강판 표면의 도금층에 접하여 도금 부착량을 제어하는 팁부, 및 상기 회전체에 연결되어 회전체를 회전시켜 일측 팁부를 강판 표면을 향하여 배치시키는 회전구동부를 포함할 수 있다.The knife extends in the width direction of the steel plate and is rotatably installed therein, and a rotating body in which cryogenic liquid is circulated therein, and is disposed at intervals along the circumferential direction on the outer circumferential surface of the rotating body and in contact with the plating layer on the surface of the steel plate to control the plating amount. It may include a tip portion, and a rotary driving portion connected to the rotating body to rotate the rotating body to place one tip portion toward the steel plate surface.
상기 팁부는 바디 또는 회전체에 착탈가능하게 설치될 수 있다. The tip portion may be detachably installed on the body or the rotating body.
상기 와이핑부는 상기 나이프에 구비되어 강판에 대한 팁부의 접촉 하중을 검출하는 로드센서, 및 상기 로드센서의 검출신호에 따라 강판에 대해 나이프를 이동하여 강판에 대한 팁부의 가압력을 제어하는 제어부를 더 포함할 수 있다.The wiping unit further includes a load sensor provided in the knife to detect a contact load of the tip portion with respect to the steel plate, and a control unit for controlling the pressing force against the steel sheet by moving the knife with respect to the steel plate according to the detection signal of the load sensor. It may include.
상기 팁부는 강판에 폭방향에 대해 평행하게 배치된 구조일 수 있다.The tip portion may be a structure disposed parallel to the width direction on the steel sheet.
상기 팁부는 강판의 폭방향에 대해 경사지게 배치된 구조일 수 있다. The tip portion may have a structure inclined with respect to the width direction of the steel sheet.
상기 팁부는 꺽여져 형성되어, 강판의 이동방향을 따라 V 자 형태 또는 역V 자 형태로 배치된 구조일 수 있다.The tip portion may be bent to form a V-shape or an inverted V-shape along the moving direction of the steel sheet.
상기 와이핑부는 강판 진행방향을 따라 상기 나이프 후단에서 강판 폭방향으로 연장되고 내부에는 극저온 액체가 순환되며, 강판 표면의 도금층에 밀착하여 도금 부착량을 제어하고 강판을 급냉시키는 칠롤을 더 포함할 수 있다.The wiping part may further include a chill roll extending from the rear end of the knife in the steel plate width direction along the moving direction of the steel plate to circulate the cryogenic liquid therein, to control the coating amount by closely contacting the plating layer on the surface of the steel plate, and to quench the steel plate. .
상기 와이핑부는 상기 칠롤에 구비되어 강판에 대한 칠롤의 접촉 하중을 검출하는 로드센서, 및 상기 로드센서의 검출신호에 따라 강판에 대해 칠롤을 이동하여 강판에 대한 칠롤의 가압력을 제어하는 제어부를 더 포함할 수 있다.The wiping unit further includes a load sensor provided in the chill roll to detect a contact load of the chill roll with respect to the steel sheet, and a control unit for controlling the pressing force of the chill roll against the steel sheet by moving the chill roll with respect to the steel sheet according to the detection signal of the load sensor. It may include.
상기 와이핑부는 칠롤에 접하여 칠롤 표면에 부착된 오염물을 제거하는 스크레퍼를 더 포함할 수 있다.The wiping unit may further include a scraper in contact with the chill roll to remove contaminants attached to the chill roll surface.
상기 냉각체는 강판 폭방향으로 연장되고 내부에는 극저온 액체가 순환되며 강판 표면의 도금층에 가압되어 냉기를 가하는 냉각롤을 포함하고, 상기 냉각롤은 복수개가 강판의 진행방향을 따라 간격을 두고 배치된 구조일 수 있다.The cooling body includes a cooling roll extending in the width direction of the steel sheet and having a cryogenic liquid circulated therein and pressurized by a plating layer on the surface of the steel sheet to apply cold air, and the plurality of cooling rolls are arranged at intervals along the advancing direction of the steel sheet. It may be a structure.
상기 냉각체는 적어도 두 개의 냉각롤 사이에 감겨져 설치되고 강판 표면의 도금층에 밀착하여 냉기를 가하는 냉각벨트를 더 포함할 수 있다.The cooling body may further include a cooling belt wound and installed between at least two cooling rolls to apply cold air in close contact with the plating layer on the surface of the steel sheet.
상기 냉각벨트는 표면에 도금층으로 전사될 패턴이 형성될 수 있다.The cooling belt may be a pattern to be transferred to the plating layer on the surface.
상기 냉각벨트는 표면에 도금층에 전사될 패턴이 형성될 수 있다. The cooling belt may be a pattern to be transferred to the plating layer on the surface.
상기 칠롤 또는 냉각롤은 -250 내지 5℃의 온도로 냉각될 수 있다.The chill roll or cooling roll may be cooled to a temperature of -250 to 5 ℃.
상기 칠롤 또는 냉각롤은 표면조도가 평균 0.1 내지 3um 일 수 있다.The chill roll or cooling roll may have an average surface roughness of 0.1 to 3um.
상기 냉각부는 상기 냉각롤에 구비되어 강판에 대한 냉각벨트의 접촉 하중을 검출하는 로드센서, 및 상기 로드센서의 검출신호에 따라 강판에 대해 냉각롤을 이동하여 강판에 대한 냉각벨트의 가압력을 제어하는 제어부를 더 포함할 수 있다.The cooling unit is provided on the cooling roll to control the pressing force of the cooling belt against the steel sheet by moving the cooling roll with respect to the steel sheet in accordance with the load sensor for detecting the contact load of the cooling belt to the steel sheet, and the detection signal of the load sensor The control unit may further include.
상기 강판의 이동방향을 따라 상기 나이프에서 냉각롤로 갈수록 강판과의 간격이 줄어들어 강판의 도금층 두께를 점차 줄이는 구조일 수 있다.In the moving direction of the steel sheet, the gap from the steel plate decreases as it goes from the knife to the cooling roll, thereby reducing the thickness of the plated layer of the steel plate.
본 구현예의 도금 방법은, 강판을 도금하는 도금 단계, 강판의 도금 부착량을 조절하는 조절 단계, 강판을 냉각하는 냉각 단계를 포함하고, 상기 조절 단계는 강판 표면의 도금층에 접촉하는 나이프로 도금 부착량을 1차적으로 조절하는 단계, 및 상기 나이프로 액체 질소나 액체 헬륨을 포함하는 극저온 액체를 공급하여 나이프를 냉각하는 단계를 포함할 수 있다.The plating method of the present embodiment includes a plating step of plating the steel sheet, an adjusting step of adjusting the plating adhesion amount of the steel sheet, and a cooling step of cooling the steel sheet, wherein the adjusting step comprises adjusting the plating deposition amount with a knife contacting the plating layer on the surface of the steel sheet. The step of adjusting first, and cooling the knife by supplying a cryogenic liquid containing liquid nitrogen or liquid helium to the knife.
본 구현예의 도금 방법은, 강판을 도금하는 도금 단계, 강판의 도금 부착량을 조절하는 조절 단계, 강판을 냉각하는 냉각 단계를 포함하고, 상기 냉각 단계는 강판 표면의 도금층에 접촉하는 냉각체로 강판에 냉기를 가하여 강판을 냉각하는 단계, 및 상기 냉각체로 액체 질소나 액체 헬륨을 포함하는 극저온 액체를 공급하여 냉각체를 냉각하는 단계를 포함할 수 있다.The plating method of the present embodiment includes a plating step of plating the steel sheet, an adjusting step of adjusting the plating adhesion amount of the steel sheet, and a cooling step of cooling the steel sheet, wherein the cooling step is cold air to the steel sheet with a cooling body in contact with the plating layer on the surface of the steel sheet. Cooling the steel sheet by adding a, and supplying a cryogenic liquid containing liquid nitrogen or liquid helium to the cooling body to cool the cooling body.
본 구현예의 도금 방법은, 강판을 도금하는 도금 단계, 강판의 도금 부착량을 조절하는 조절 단계, 강판을 냉각하는 냉각 단계를 포함하고, 상기 조절 단계는 강판 표면의 도금층에 접촉하는 나이프로 도금 부착량을 1차적으로 조절하는 단계, 및 상기 나이프로 액체 질소나 액체 헬륨을 포함하는 극저온 액체를 공급하여 나이프를 냉각하는 단계를 포함하며, 상기 냉각 단계는 강판 표면의 도금층에 접촉하는 냉각체로 강판에 냉기를 가하여 강판을 냉각하는 단계, 및 상기 냉각체로 액체 질소나 액체 헬륨을 포함하는 극저온 액체를 공급하여 냉각체를 냉각하는 단계를 포함할 수 있다.The plating method of the present embodiment includes a plating step of plating the steel sheet, an adjusting step of adjusting the plating adhesion amount of the steel sheet, and a cooling step of cooling the steel sheet, wherein the adjusting step comprises adjusting the plating deposition amount with a knife contacting the plating layer on the surface of the steel sheet. Firstly adjusting, and cooling the knife by supplying a cryogenic liquid containing liquid nitrogen or liquid helium to the knife, wherein the cooling step comprises cooling air to the steel sheet by a cooling body in contact with a plating layer on the surface of the steel sheet. And cooling the steel sheet to supply the cryogenic liquid including liquid nitrogen or liquid helium to the cooling body to cool the cooling body.
상기 조절 단계는, 강판 표면의 도금층에 밀착되는 칠롤로 도금 부착량을 2차 조절하면서 강판을 냉각하는 단계, 및 상기 칠롤로 액체 질소나 액체 헬륨을 포함하는 극저온 액체를 공급하여 칠롤을 냉각하는 단계를 더 포함할 수 있다.The adjusting step includes the steps of: cooling the steel sheet while secondly adjusting the plating adhesion amount with the chill roll which is in close contact with the plating layer on the surface of the steel sheet, and supplying the cryogenic liquid containing liquid nitrogen or liquid helium to the chill roll to cool the chill roll. It may further include.
상기 조절 단계는 강판에 대한 나이프 또는 칠롤의 접촉 하중을 검출하는 단계, 및 검출된 접촉 하중에 따라 강판에 대한 나이프 또는 칠롤의 가압력을 제어하는 단계를 더 포함할 수 있다.The adjusting step may further include detecting a contact load of the knife or chill roll on the steel sheet, and controlling the pressing force of the knife or chill roll on the steel sheet according to the detected contact load.
상기 냉각 단계는 강판에 대한 냉각체의 접촉 하중을 검출하는 단계, 및 검출된 접촉 하중에 따라 강판에 대한 냉각체의 가압력을 제어하는 단계를 더 포함할 수 있다.The cooling step may further include detecting a contact load of the cooling body against the steel sheet, and controlling a pressing force of the cooling body against the steel sheet according to the detected contact load.
상기 조절 단계와 냉각 단계는 강판의 이동방향을 따라 강판의 도금층 두께를 점차 줄이는 구조일 수 있다.The adjusting step and the cooling step may be a structure that gradually reduces the thickness of the plated layer of the steel sheet along the moving direction of the steel sheet.
상기 조절 단계에서, 나이프의 팁부는 -250 내지 5℃의 온도로 유지될 수 있다.In the adjusting step, the tip portion of the knife can be maintained at a temperature of -250 to 5 ℃.
상기 조절 단계에서, 칠롤은 -250 내지 5℃의 온도로 유지될 수 있다.In the adjusting step, the chillol may be maintained at a temperature of -250 to 5 ℃.
상기 냉각 단계에서, 냉각체는 -250 내지 5℃의 온도로 유지될 수 있다.In the cooling step, the cooling body may be maintained at a temperature of -250 to 5 ℃.
상기 도금 강판은 20℃/sec 이상의 냉각속도로 급냉될 수 있다.The plated steel sheet may be quenched at a cooling rate of 20 ° C./sec or more.
상기 도금 강판은 20℃/sec 이상의 냉각속도로 250℃ 이하의 온도까지 급냉될 수 있다.The plated steel sheet may be quenched to a temperature of 250 ° C. or less at a cooling rate of 20 ° C./sec or more.
상기 조절 단계 또는 냉각 단계에서 사용된 액체 질소에 의한 배출가스를 열처리로 내 환원가스, 냉각 공정의 분위기 유지용 가스로 사용하는 단계를 더 포함할 수 있다.The method may further include using the exhaust gas by the liquid nitrogen used in the adjusting or cooling step as a reducing gas in the heat treatment furnace, an atmosphere maintaining gas of the cooling process.
상기 냉각 단계에서, 냉각체 표면에 형성된 패턴을 도금층으로 전사하여 도금층 표면에 패턴을 형성하는 단계를 더 포함할 수 있다.In the cooling step, the method may further include transferring the pattern formed on the surface of the cooling body to the plating layer to form a pattern on the surface of the plating layer.
이상 설명한 바와 같은 본 구현예에 의하면, 공정을 단순화하여 품질 관리 요소들을 줄임으로써, 관리가 용이하고 생산성을 높일 수 있게 된다. 이에 경쟁사와 비교하여 제품 경쟁력을 높이고 수익성을 개선할 수 있게 된다.According to the present embodiment as described above, by simplifying the process to reduce the quality control elements, it is easy to manage and increase the productivity. As a result, it is possible to increase product competitiveness and improve profitability compared to competitors.
또한, 냉각 효율을 높여 보다 효과적으로 강판을 급냉시킴으로써, 냉각을 위한 설비의 길이를 줄일 수 있고, 강판 표면 결함 발생을 저감하여 표면 품질이 우수한 도금강판을 제조할 수 있게 된다.In addition, by quenching the steel sheet more effectively by increasing the cooling efficiency, it is possible to reduce the length of the equipment for cooling, to reduce the occurrence of steel sheet surface defects can be produced a plated steel sheet with excellent surface quality.
또한, 강판에 냉각용 가스가 접촉되지 않아, 종래 가스 분사에 따른 아연 도금 비산이나 드로스, 소음의 발생의 문제를 해소할 수 있게 된다.In addition, the cooling gas does not come into contact with the steel sheet, thereby eliminating problems of generation of galvanized scattering, dross and noise caused by conventional gas injection.
또한, 강판에 직접 접촉되는 칠롤을 이용하여 급속 냉각이 이루어짐에 따라, 난도금성 강종에 대해서도 도금성 개선의 효과를 얻을 수 있다.In addition, as the rapid cooling is performed by using the chill roll in direct contact with the steel sheet, it is possible to obtain an effect of improving the plating property even for non-plated steel grades.
또한, 도금 부착량에 대한 정밀 제어가 용이하고, 강판의 폭방향으로 도금 부착량 편차나 도금층 조직 편차를 최소화하여 고품질의 도금강판을 제조할 수 있게 된다.In addition, it is easy to precisely control the plating deposition amount, it is possible to manufacture a high quality plated steel sheet by minimizing the plating deposition amount deviation or plating layer structure deviation in the width direction of the steel sheet.
도 1은 본 실시예에 따른 용융 아연 도금 장치를 도시한 개략적인 도면이다.1 is a schematic diagram showing a hot dip galvanizing apparatus according to the present embodiment.
도 2는 본 실시예에 따른 용융 아연 도금 장치의 나이프 구조를 도시한 개략적인 도면이다.2 is a schematic view showing a knife structure of the hot dip galvanizing apparatus according to the present embodiment.
도 3은 본 실시예에 따른 용융 아연 도금 장치의 나이프에 대한 또다른 실시예를 도시한 개략적인 도면이다.3 is a schematic view showing another embodiment of a knife of the hot dip galvanizing apparatus according to the present embodiment.
도 4는 본 실시예에 따른 나이프의 강판에 대한 접촉하중 제어 구조를 도시한 개략적인 도면이다.4 is a schematic view showing a contact load control structure for the steel sheet of the knife according to the present embodiment.
도 5는 본 실시예에 따른 나이프의 팁부 구조 및 강판에 대한 배치 구조의 다양한 실시예를 도시한 개략적인 도면이다.5 is a schematic view showing various embodiments of the tip structure of the knife and the arrangement structure with respect to the steel sheet according to the present embodiment.
도 6은 본 실시예에 따른 용융 아연 도금 장치의 칠롤의 구조를 도시한 개략적인 도면이다.6 is a schematic diagram showing the structure of a chill roll of a hot dip galvanizing apparatus according to the present embodiment.
도 7 내지 도 8은 본 실시예에 따른 용융 아연 도금 장치의 냉각부 구조를 도시한 개략적인 도면이다.7 to 8 are schematic views showing the cooling unit structure of the hot dip galvanizing apparatus according to the present embodiment.
이하, 첨부한 도면을 참조하여, 본 발명이 속하는 기술분야에서 통상의 지식을 가진 자가 용이하게 실시할 수 있도록 본 발명의 실시예를 설명한다. 본 발명이 속하는 기술분야에서 통상의 지식을 가진 자가 용이하게 이해할 수 있는 바와 같이, 후술하는 실시예는 본 발명의 개념과 범위를 벗어나지 않는 한도 내에서 다양한 형태로 변형될 수 있으며 여기에서 설명하는 실시예에 한정되지 않는다.Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art can easily understand, the embodiments described below may be modified in various forms without departing from the concept and scope of the invention, and the embodiments described herein. It is not limited to the example.
도면들은 개략적이고 축적에 맞게 도시되지 않았다는 것을 일러둔다. 도면에 있는 부분들의 상대적인 치수 및 비율은 도면에서의 명확성 및 편의를 위해 그 크기에 있어 과장되거나 감소되어 도시되었으며 임의의 치수는 단지 예시적인 것이지 한정적인 것은 아니다.It is noted that the figures are schematic and not drawn to scale. The relative dimensions and ratios of the parts in the figures have been exaggerated or reduced in size for clarity and convenience in the figures and any dimensions are merely exemplary and not limiting.
이하, 본 실시예는 도금 장치로 강판 표면에 아연계 금속이나 금속 합금을 을 도금하는 용융 아연 도금 장치를 예로서 설명한다. 본 도금 장치는 아연계 금속이나 금속 합금의 도금에 한정되지 않으며, 다양한 금속에 대한 용융 도금 장치에 모두 적용가능하다.Hereinafter, the present embodiment will be described by way of example a hot dip galvanizing apparatus for plating a zinc-based metal or a metal alloy on a steel sheet surface with a plating apparatus. The present plating apparatus is not limited to the plating of zinc-based metals or metal alloys, and is applicable to both hot dip plating apparatuses for various metals.
도 1은 본 실시예에 따른 용융 아연 도금 장치를 개략적으로 도시하고 있다.1 schematically shows a hot dip galvanizing apparatus according to the present embodiment.
도 1에 도시된 바와 같이, 본 실시예의 도금 장치는 강판(P)을 용융 도금하는 도금 욕조(10), 강판 진행방향을 따라 상기 도금 욕조(10) 후단에서 강판의 일면 또는 양면에 배치되어 강판의 도금 부착량을 제어하는 와이핑부, 및 강판 진행방향을 따라 상기 와이핑부 후단에서 강판의 일면 또는 양면에 배치되어 강판을 냉각시키기 위한 냉각부를 포함한다.As shown in Figure 1, the plating apparatus of the present embodiment is a plating bath 10 for hot-dip steel plate (P), the steel plate is disposed on one side or both sides of the steel plate at the rear end of the plating bath 10 along the steel plate traveling direction Wiping part for controlling the plating deposition of the, and the cooling unit for cooling the steel sheet is disposed on one side or both sides of the steel plate at the rear end of the wiping portion along the steel plate traveling direction.
도금 욕조(10)로 안내된 강판(P)은 도금 욕조(10) 내에 배치된 싱크롤(sink roll)(12)을 지나면서 용융 금속에 담겨져 용융 도금 공정이 진행된다. 강판(P)은 싱크롤(12)에 의해 진행 방향이 전환되어 도금 욕조(10) 상부로 이동하게된다. 도금 욕조(10) 내의 용융 금속에 의해 표면이 도금된 강판(P)은 도금 욕조(10) 상부로 인출된다. 강판은 진행방향을 따라 차례로 배치된 와이핑부 및 냉각부를 거쳐 도금 강판으로 제조된다. 냉각부를 거쳐 급냉된 강판은 텐션롤(14)을 거쳐 공정으로 진행된다.The steel sheet P guided to the plating bath 10 is immersed in the molten metal while passing through a sink roll 12 disposed in the plating bath 10 to perform a hot dip plating process. The steel sheet P is moved in the direction of movement by the sink roll 12 to move above the plating bath 10. The steel plate P whose surface is plated by the molten metal in the plating bath 10 is drawn out to the upper portion of the plating bath 10. The steel sheet is made of a plated steel sheet via a wiping portion and a cooling portion that are sequentially disposed along a traveling direction. The steel sheet quenched through the cooling section proceeds to the process via the tension roll (14).
본 실시예에서 적용 가능한 도금 용액은 아연 및 아연 합금과 알루미늄 및 알루미늄 합금 등 금속 및 합금 용융액은 모두 적용이 가능하고 금속 및 합금의 도금이라면 별도의 제한이 없이 적용될 수 있다.The plating solution applicable in the present embodiment may be applied to both metal and alloy melts such as zinc and zinc alloys and aluminum and aluminum alloys, and may be applied without any limitation as long as the plating solution is metal and alloy.
본 실시예에서, 상기 와이핑부는 강판 표면에 부착된 도금층에 직접 접촉하여 도금 부착량을 조절하는 구조로 되어 있다.In this embodiment, the wiping part is in direct contact with the plating layer attached to the surface of the steel sheet to have a structure for adjusting the plating adhesion amount.
이를 위해, 상기 와이핑부는 강판(P) 표면의 도금층에 접촉하여 도금 부착량을 제어하는 나이프(20), 및 상기 나이프(20)로 액체 질소나 액체 헬륨을 포함하는 극저온 액체를 공급하여 나이프(20)를 냉각하는 냉매공급부(50)를 포함할 수 있다.To this end, the wiping unit 20 contacts the plating layer on the surface of the steel sheet P to control the coating amount, and supplies the cryogenic liquid including liquid nitrogen or liquid helium to the knife 20 to supply the knife 20. It may include a refrigerant supply unit 50 for cooling).
나이프(20)를 도금층에 직접 접촉함으로써, 도금욕면의 산화물 혼입을 방지하고 보다 용이하게 강판의 도금 부착량을 제어할 수 있다. 상기 냉매공급부(50)는 나이프(20)를 극저온 액체로 냉각시킴으로써, 나이프(20)의 온도를 낮춰 나이프(20)가 고온의 도금층에 직접 접촉하는 상태에서도 도금 용액이 나이프(20)에 융착되는 것을 방지할 수 있게 된다.By directly contacting the knife 20 with the plating layer, it is possible to prevent the oxide mixing of the plating bath surface and to control the plating deposition amount of the steel sheet more easily. The coolant supply unit 50 cools the knife 20 to a cryogenic liquid, thereby lowering the temperature of the knife 20 so that the plating solution is fused to the knife 20 even when the knife 20 is in direct contact with the hot plating layer. Can be prevented.
또한, 본 실시예에서 상기 냉각부는 강판 표면의 도금층에 직접 접촉하여 강판을 냉각하는 구조로 되어 있다. In addition, in the present embodiment, the cooling unit is configured to cool the steel sheet by directly contacting the plating layer on the surface of the steel sheet.
이를 위해, 상기 냉각부는 강판 표면의 도금층에 밀착하여 도금층을 냉각하는 적어도 하나 이상의 냉각체(60), 및 상기 냉각체(60)로 액체 질소나 액체 헬륨을 포함하는 극저온 액체를 공급하여 냉각체(60)를 냉각하는 냉매공급부(50)를 포함할 수 있다.To this end, the cooling unit is in contact with the plating layer on the surface of the steel sheet at least one cooling body 60 for cooling the plating layer, and supplying a cryogenic liquid containing liquid nitrogen or liquid helium to the cooling body (60) 60 may include a refrigerant supply unit 50 for cooling.
냉각체(60)를 도금층에 직접 접촉하여 강판의 도금층을 냉각시킴으로써, 냉각 능력을 극대화하여 보다 신속하게 강판 도금층을 급냉시킬 수 있게 된다. 상기 냉각부는 냉각체(60)를 극저온 액체로 냉각시킴으로써, 냉각체(60)의 온도를 낮춰 냉각체(60)가 고온의 도금층에 직접 접촉하는 상태에서도 도금 용액이 냉각체(60)에 융착되는 것을 방지할 수 있게 된다.By directly cooling the plate 60 to the plated layer to cool the plated layer of the steel sheet, it is possible to maximize the cooling capacity to quench the plated layer more quickly. The cooling unit cools the cooling body 60 to a cryogenic liquid, thereby lowering the temperature of the cooling body 60 so that the plating solution is fused to the cooling body 60 even when the cooling body 60 is in direct contact with the hot plating layer. Can be prevented.
상기 냉매공급부(50)는 나이프(20) 또는 냉각체(60)로 극저온 액체를 공급하기 위한 것으로, 예를 들어 극저온 액체가 수용된 탱크, 극저온 액체가 이송되는 공급라인, 공급라인 상에 설치되는 공급펌프를 포함할 수 있다. 상기 냉매공급부(50)는 극저온 액체를 공급할 수 있는 구조면 모두 적용가능하며 다양하게 변형될 수 있다.The refrigerant supply unit 50 is for supplying cryogenic liquid to the knife 20 or the cooling body 60, for example, a tank containing cryogenic liquid, a supply line for transporting cryogenic liquid, a supply installed on a supply line It may include a pump. The refrigerant supply unit 50 is applicable to all of the structural surface to supply the cryogenic liquid can be variously modified.
상기 냉매공급부(50)에서 사용되는 극저온 액체는 액체 질소, 액체 헬륨 이외에 액체 아르곤 등 다양한 액체가 사용될 수 있다. 액체 질소를 사용하는 경우 보다 경제성을 높일 수 있다.As the cryogenic liquid used in the refrigerant supply unit 50, various liquids such as liquid argon may be used in addition to liquid nitrogen and liquid helium. The use of liquid nitrogen can be more economical.
이와 같이, 극저온 액체를 사용하여 냉각된 나이프(20)와 냉각체(60)가 강판(P)에 직접 접촉되어 강판의 도금량을 제어하고 급냉시킴으로써, 본 실시예를 통해 도금 강판의 도금 부착량을 정밀 제어할 수 있고, 도금 강판의 냉각속도를 20℃/sec 이상으로 높일 수 있게 된다. 따라서, 강판 냉각을 위한 설비 라인 길이를 획기적으로 단축하고 제품 생산 속도를 높일 수 있게 된다.As such, the knife 20 and the cooling body 60 cooled by using the cryogenic liquid directly contact the steel sheet P to control and rapidly cool the plating amount of the steel sheet, thereby precisely adjusting the plating adhesion amount of the plated steel sheet through this embodiment. It can control and can raise the cooling rate of a plated steel plate to 20 degree-C / sec or more. Therefore, it is possible to significantly shorten the equipment line length for cooling the steel sheet and increase the product production speed.
상기 냉매공급부(50)를 통해 나이프(20) 또는 냉각체(60)로 공급된 극저온 액체는 나이프(20) 또는 냉각체(60)를 지나면서 도금층과 열교환되어 기체화될 수 있다. 나이프(20) 또는 냉각체(60)에서 배출되는 가스는 적절한 여과 장치를 거쳐 제철 공정의 열처리로(furnace) 내 환원가스 또는 냉각공정에서의 비산화성 분위기 유지를 위한 가스로 사용하여 재활용될 수 있다.The cryogenic liquid supplied to the knife 20 or the cooling body 60 through the coolant supply unit 50 may be gasified by heat exchange with the plating layer while passing through the knife 20 or the cooling body 60. The gas discharged from the knife 20 or the cooling body 60 may be recycled by using a reducing gas in a heat treatment furnace of a steelmaking process or a gas for maintaining a non-oxidizing atmosphere in a cooling process through an appropriate filtration device. .
도 2는 본 실시예에 따른 나이프의 구체적인 구조를 예시하고 있다.2 illustrates a specific structure of the knife according to the present embodiment.
본 실시예에서, 상기 나이프(20)는 강판의 양면에 대향 배치되어 강판(P) 양면에 대해 도금액의 부착량을 조절한다. 강판(P) 양면에 배치되는 나이프(20)는 동일한 구조로 이루어지며, 이하 설명은 강판의 일면에 대한 나이프만을 예로서 설명한다.In this embodiment, the knife 20 is disposed opposite to both sides of the steel sheet to adjust the deposition amount of the plating liquid on both sides of the steel sheet (P). Knife 20 disposed on both sides of the steel sheet (P) is made of the same structure, the following description will be described by way of example only a knife for one surface of the steel sheet.
도 2에 도시된 바와 같이, 상기 나이프(20)는 강판(P) 폭방향으로 연장되고 내부에는 극저온 액체가 순한되는 바디(22), 및 상기 바디(22) 선단에 설치되고 강판의 도금층에 접하는 팁부(24)를 포함하여, 강판 표면의 도금 부착량을 1차적으로 제어하는 구조일 수 있다.As shown in FIG. 2, the knife 20 extends in the width direction of the steel plate P and has a body 22 in which a cryogenic liquid is gentle, and is installed at the tip of the body 22 and in contact with a plating layer of the steel plate. Including the tip portion 24, it may be a structure that primarily controls the amount of plating on the surface of the steel sheet.
상기 바디(22)와 상기 팁부(24)는 액체 질소 사용에 따른 극저온 환경에서 장시간 안정적으로 사용 가능하도록, 극저온 내구성이 우수한 스테인레스 등의 금속(metal), 세라믹(ceramic) 또는 세라믹 코팅된 금속재 등으로 제조될 수 있다.The body 22 and the tip portion 24 are made of metal, ceramic, or ceramic coated metal such as stainless steel having excellent cryogenic durability, so that the body 22 and the tip portion 24 can be stably used in a cryogenic environment due to the use of liquid nitrogen. Can be prepared.
상기 바디(22)는 내부에 극저온 액체가 지나가도록 유로(26)가 형성된다. 상기 바디(22)에 연결된 냉매공급부(50)는 유로(26)를 통해 극저온 액체를 순환 공급한다. 상기 유로(26)는 바디(22)의 선단에 설치된 팁부(24)를 충분히 냉각할 수 있도록 팁부(24)가 위치한 선단까지 연장 형성되어, 팁부(24)에 극저온 액체가 접촉될 수 있도록 한다. The body 22 has a flow path 26 formed therein so that cryogenic liquid passes therethrough. The refrigerant supply unit 50 connected to the body 22 circulates and supplies the cryogenic liquid through the flow path 26. The flow path 26 extends to the tip where the tip 24 is positioned to sufficiently cool the tip 24 installed at the tip of the body 22, so that the cryogenic liquid can contact the tip 24.
본 실시예에서, 상기 팁부(24)는 바디(22)에 대해 착탈가능하게 설치될 수 있다. In this embodiment, the tip part 24 may be detachably installed with respect to the body 22.
상기 팁부(24)는 고온의 도금층과 계속 접촉되어 마모된다. 이에, 소모성인 팁부(24)를 교체가능한 부품화하여 마모시 바디(22)에서 팁부(24)만을 교체하여 나이프(20)를 계속 사용할 수 있다. 상기 팁부(24)는 보다 정밀한 도금 부착량 제어를 위해 선단으로 갈수록 뾰족하게 형성된 구조일 수 있다. The tip portion 24 keeps in contact with the hot plating layer and wears out. Accordingly, the tip portion 24 that is consumable can be replaced to replace the tip portion 24 in the body 22 when worn, so that the knife 20 can be continuously used. The tip portion 24 may have a structure that is pointed toward the tip for more precise plating deposition control.
상기 바디(22)로 공급된 극저온 액체는 유로(26)를 따라 순환되면서 팁부(24)를 냉각시켜, 팁부(24)를 저온 상태를 유지시키게 된다. 이에, 팁부(24)는 도금층에 접한 상태에서 도금용액이 팁부(24)에 부착되는 것을 방지하면서, 일차적으로 도금 부착층을 보다 정확하게 제어할 수 있게 된다.The cryogenic liquid supplied to the body 22 is circulated along the flow path 26 to cool the tip 24, thereby keeping the tip 24 at a low temperature. Accordingly, the tip part 24 may first control the plating adhesion layer more accurately while preventing the plating solution from being attached to the tip part 24 in the state in contact with the plating layer.
도 3은 나이프의 또다른 실시예를 예시하고 있다. 도 3의 실시예에 따른 나이프는 팁부 이상시 바로 교환하여 사용할 수 있도록 복수개의 팁부를 구비한 구조로 되어 있다.3 illustrates another embodiment of a knife. Knife according to the embodiment of Figure 3 has a structure having a plurality of tips to be used immediately to replace the tip portion.
이를 위해, 본 실시예의 나이프(21)는 강판 폭방향으로 연장되고 회전가능하게 설치되며 내부에는 극저온 액체가 순환되는 회전체(23)와, 상기 회전체(23) 외주면에 원주방향을 따라 간격을 두고 설치되고 강판(P) 표면의 도금층에 접하여 도금 부착량을 제어하는 팁부(24), 및 상기 회전체(23)에 연결되어 회전체(23)를 회전시켜 일측 팁부(24)를 강판 표면을 향하여 배치시키는 회전구동부를 포함할 수 있다.To this end, the knife 21 of the present embodiment extends in the width direction of the steel sheet and is rotatably installed therein and a space along the circumferential direction on the outer circumferential surface of the rotating body 23 and the outer surface of the rotating body 23 circulating cryogenic liquid. The tip part 24 which is installed in contact with the plated layer on the surface of the steel sheet P and controls the plating amount, and is connected to the rotating body 23 to rotate the rotating body 23 so that the one side tip part 24 faces the steel plate surface. It may include a rotation driving unit to be disposed.
이에, 팁부(24) 마모와 같은 이상 발생시 회전체(23)를 회전시켜 사용중인 팁부(24)를 강판에서 이격시키고 대기중에 있는 다른 팁부(24)를 강판쪽으로 이동시킴으로써, 바로 팁부(24)를 교체하여 사용할 수 있게 된다. 상기 팁부(24)는 도 3에 도시된 바와 같이 4개가 회전체(23) 외주면을 따라 90도 각도로 배치될 수 있다. 이에 회전체(23)가 90도 각도로 회전되어 각 팁부(24)를 강판 표면쪽으로 이동시킬 수 있게 된다. 상기 팁부(24)의 설치 개수는 다양하게 변형 가능하다. Accordingly, when an abnormality such as wear of the tip part 24 occurs, the tip part 24 is immediately moved by rotating the rotating body 23 to separate the tip part 24 in use from the steel plate and moving the other tip part 24 in the air toward the steel plate. It can be replaced. As illustrated in FIG. 3, four tip parts 24 may be disposed at an angle of 90 degrees along the outer circumferential surface of the rotating body 23. As a result, the rotating body 23 is rotated at an angle of 90 degrees to move each tip portion 24 toward the steel plate surface. The number of installation of the tip portion 24 can be variously modified.
본 실시예에서, 상기 회전체(23)는 원통형태로 이루어질 수 있다. 상기 회전체(23)는 원통형태에 한정되지 않으며, 예를 들어 회전축의 외주면을 따라 위에서 언급한 바디(22)가 각도를 두고 연속적으로 배치된 구조일 수 있다. 상기 회전체(23)의 양 선단은 설비 상에 별도의 지지대(도시되지 않음)에 회전가능하게 지지될 수 있다.In this embodiment, the rotating body 23 may have a cylindrical shape. The rotating body 23 is not limited to a cylindrical shape, for example, may have a structure in which the above-mentioned body 22 is continuously disposed at an angle along the outer circumferential surface of the rotating shaft. Both ends of the rotating body 23 may be rotatably supported by a separate support (not shown) on the installation.
상기 회전체(23) 역시 액체 질소 사용에 따른 극저온 환경에서 장시간 안정적으로 사용 가능하도록, 극저온 내구성이 우수한 스테인레스 등의 금속(metal), 세라믹(ceramic) 또는 세라믹 코팅된 금속재 등으로 제조될 수 있다.The rotating body 23 may also be made of metal, ceramic, or ceramic coated metal material having excellent cryogenic durability such that it can be stably used for a long time in a cryogenic environment due to the use of liquid nitrogen.
상기 회전체(23)는 내부에 극저온 액체가 지나가도록 유로(도시되지 않음)가 형성된다. 회전체(23) 내부에 형성되는 유로는 회전체(23)의 회전축 양 선단을 통해 냉매공급부(50)와 연결될 수 있다. 냉매공급부(50)로부터 공급된 극저온 액체는 상기 회전체(23)의 선단을 통해 회전체(23) 내부의 유로로 순환 공급된다. 상기 유로는 회전체(23) 외주면에 설치된 팁부(24)를 충분히 냉각할 수 있도록 팁부(24)가 위치한 표면으로 연장 형성되어, 팁부(24)에 극저온 액체가 접촉될 수 있도록 한다. The rotating body 23 is formed with a flow path (not shown) so that the cryogenic liquid passes therein. The flow path formed inside the rotating body 23 may be connected to the refrigerant supply unit 50 through both ends of the rotating shaft of the rotating body 23. The cryogenic liquid supplied from the coolant supply unit 50 is circulated and supplied to the flow path inside the rotor 23 through the tip of the rotor 23. The flow path is formed to extend to the surface on which the tip portion 24 is located to sufficiently cool the tip portion 24 installed on the outer circumferential surface of the rotating body 23 to allow the cryogenic liquid to contact the tip portion 24.
상기 회전체(23)의 표면에 축방향을 따라 팁부(24)가 설치된다. 상기 팁부(24)는 회전체(23) 표면에 착탈가능하게 설치될 수 있다.A tip portion 24 is installed along the axial direction on the surface of the rotating body 23. The tip part 24 may be detachably installed on the surface of the rotating body 23.
상기 회전구동부는 회전체(23)를 설정된 각도만큼 회전시키는 구조면 모두 적용가능하다. 도 3에 도시된 바와 같이 예를 들어, 상기 회전동부는 회전체(23)와 구동벨트(25)로 연결되어 동력을 전달하는 스텝모터(27)를 포함할 수 있다. 이에, 스텝모터(27)가 일정량 회전구동되면 구동벨트(25)를 통해 회전체(23)에 동력이 전달되어 회전체(23)가 팁부(24)의 배치 간격만큼 회전된다. 회전체(23)의 회전에 따라 회전체(23) 표면에 설치되어 대기 중에 있던 새 팁부(24)가 강판 쪽으로 이동하여 강판 표면의 도금층에 접촉된다. 그리고 회전체(23) 회전에 따라 마모되거나 이상이 있는 팁부(24)는 강판 표면에서 외측으로 이격되어 대기 위치로 이동된다. 마모된 팁부(24)는 대기 위치에서 교체 또는 표면 연마 작업을 통해 처리된다.The rotation driving unit is applicable to all of the structural surface to rotate the rotating body 23 by a predetermined angle. For example, as shown in FIG. 3, the rotating shaft may include a step motor 27 connected to the rotating body 23 and the driving belt 25 to transmit power. Thus, when the step motor 27 is rotated by a predetermined amount, power is transmitted to the rotating body 23 through the driving belt 25 so that the rotating body 23 is rotated by the disposition interval of the tip portion 24. As the rotor 23 rotates, the new tip portion 24 provided on the rotor 23 surface in the air moves toward the steel sheet and contacts the plating layer on the steel sheet surface. And the tip portion 24 that is worn or abnormal according to the rotation of the rotor 23 is spaced outward from the steel plate surface is moved to the standby position. The worn tip 24 is processed through a replacement or surface polishing operation in the standby position.
이와 같이, 본 실시예의 경우 회전체(23)를 소정 각도로 회전시키는 것으로 간단하게 팁부(24)를 교체함으로써, 팁부(24) 교체에 따른 시간을 줄이고 연속적으로 작업을 진행할 수 있게 된다.As described above, in the present embodiment, by simply rotating the tip portion 24 by rotating the rotor 23 at a predetermined angle, the time required for replacing the tip portion 24 can be reduced and the work can be continuously performed.
본 실시예에서, 상기 나이프(20,21)는 내부로 극저온 액체를 순환시켜 팁부(24)를 -250 내지 5℃로 냉각시킬 수 있다. 상기 팁부(24)의 온도가 5℃ 보다 높게 되면 고온의 도금용액이 팁부(24)에 부착되는 문제가 발생된다. 상기 팁부(24)의 온도가 -250℃ 보다 낮은 경우에는 상기 팁부(24)의 저온취성 파괴 문제가 발생된다.In the present embodiment, the knives 20 and 21 may circulate the cryogenic liquid therein to cool the tip portion 24 to -250 to 5 ° C. When the temperature of the tip part 24 is higher than 5 ° C., a problem arises in that the hot plating solution is attached to the tip part 24. When the temperature of the tip portion 24 is lower than −250 ° C., low temperature brittle fracture of the tip portion 24 occurs.
상기 나이프(20,21)는 강판에 대해 이동되어 강판과의 간격을 가변함으로써 팁부(24)에 의한 도금 부착량을 정밀하게 조절하게 된다. The knives 20 and 21 are moved relative to the steel plate to precisely control the amount of plating deposition by the tip portion 24 by varying the distance from the steel plate.
상기 나이프(20)가 강판의 도금층으로 더 접근하거나 도금층에서 외측으로 이격됨으로써, 팁부(24)와 강판(P)과의 간격이 달라져 강판의 도금 부착량이 조절된다.As the knife 20 approaches the plated layer of the steel sheet further or is spaced outward from the plated layer, the gap between the tip portion 24 and the steel sheet P is changed to control the plating adhesion amount of the steel sheet.
도 4에 도시된 바와 같이, 상기 나이프(20)에 의한 도금 부착량의 정밀 제어를 위해, 상기 와이핑부는 상기 나이프(20)에 구비되어 강판(P)에 대한 팁부(24)의 접촉 하중을 검출하는 로드센서(30), 및 상기 로드센서(30)의 검출신호에 따라 강판에 대해 나이프(20)를 이동하여 강판에 대한 팁부(24)의 가압력을 제어하는 제어부(32)를 더 포함할 수 있다.As shown in FIG. 4, in order to precisely control the plating amount by the knife 20, the wiping part is provided in the knife 20 to detect a contact load of the tip part 24 against the steel plate P. The load sensor 30 and the control unit 32 for controlling the pressing force of the tip portion 24 with respect to the steel sheet by moving the knife 20 with respect to the steel sheet in accordance with the detection signal of the load sensor 30 have.
팁부(24)와 강판(P) 사이의 간격은 로드센서(30)를 통해 검출된 팁부의 접촉 하중을 통해 확인할 수 있다. 팁부(24)와 강판(P) 사이의 간격이 좁아지면 팁부(24)가 강판의 도금층에 깊이 들어가 도금 용액과의 접촉량이 많아지면서 접촉하중이 커지게 되며, 반대로 팁부(24)가 강판(P)에서 이격되면 도금 용액과의 접촉량이 줄면서 접촉하중이 작아지게 된다.The interval between the tip portion 24 and the steel sheet P can be confirmed through the contact load of the tip portion detected through the load sensor 30. When the gap between the tip portion 24 and the steel sheet P is narrowed, the tip portion 24 deeply enters the plating layer of the steel sheet, and the contact load increases as the amount of contact with the plating solution increases, whereas the tip portion 24 becomes the steel sheet P. When spaced apart from) decreases the contact load with the plating solution.
상기 제어부(32)는 로드센서(30)의 검출값을 연산하여 1차적으로 설정된 도금 부착량에 맞춰 강판(P)에 대해 나이프(20)를 이동시켜 도금 부착량을 제어한다. The controller 32 controls the plating amount by calculating the detection value of the load sensor 30 by moving the knife 20 with respect to the steel plate P according to the plating amount set primarily.
강판에 대한 상기 나이프(20)의 이동은 예를 들어, 나이프(20)에 결합된 구동실린더 등의 구동부(34)를 통해 이루어질 수 있다. 상기 구동부(34)는 구동실린더나 모터 등 다양한 동력원이 이용될 수 있으며, 나이프(20)를 강판에 대해 직선 이동시킬 수 있는 구조면 모두 적용가능하다.Movement of the knife 20 relative to the steel sheet may be made through, for example, a driving unit 34 such as a driving cylinder coupled to the knife 20. The drive unit 34 may be used a variety of power sources such as a drive cylinder or a motor, it is possible to apply both of the structural surface to move the knife 20 in a straight line with respect to the steel sheet.
또한, 상기 제어부(32)는 로드센서(30)의 측정값 변화를 감지하여, 장치 이상 유무를 확인할 수 있다. 장치 이상 판별시 나이프(20)에서 팁부(24)를 교체하는 등 필요한 조치를 바로 취할 수 있게 된다.In addition, the control unit 32 may detect the change in the measured value of the load sensor 30, and determine whether there is a device abnormality. When determining the abnormality of the device, it is possible to immediately take the necessary measures, such as replacing the tip portion 24 in the knife 20.
도 5는 강판에 대한 나이프의 팁부 형태 및 강판에 대한 팁부의 배치 구조를 예시하고 있다.5 illustrates the shape of the tip portion of the knife with respect to the steel plate and the arrangement of the tip portion with respect to the steel plate.
본 실시예에서, 상기 나이프(20,21)에 설치되는 팁부(24)는 직선 형태이거나, 중간이 꺽여져 V자 형태를 이루는 구조 등 다양한 구조로 형성될 수 있다. 상기 팁부(24)가 설치되는 나이프의 바디(22) 또는 회전체(23) 역시 팁부(24)의 형태와 동일한 구조로 이루어질 수 있다. 예를 들어, 상기 팁부(24)가 V자 형태로 이루어진 경우 팁부(24)가 설치되는 나이프(20)의 바디(22) 역시 선단부는 팁부(24)와 같은 형태인 V 자 형태로 이루어질 수 있다.In the present embodiment, the tip portion 24 installed in the knife 20, 21 may be formed in a variety of structures, such as a straight form, or a bent in the middle to form a V-shape. The body 22 or the rotating body 23 of the knife in which the tip part 24 is installed may also have the same structure as that of the tip part 24. For example, when the tip portion 24 has a V shape, the body 22 of the knife 20 on which the tip portion 24 is installed may also have a V shape having the same shape as the tip portion 24. .
도 5에 도시된 바와 같이, 상기 팁부(24)는 강판(P)에 폭방향에 대해 평행하게 배치될 수 있다. 또한, 상기 팁부(24)는 강판의 폭방향에 대해 경사지게 배치될 수 있다.As shown in FIG. 5, the tip portion 24 may be disposed parallel to the steel plate P with respect to the width direction. In addition, the tip portion 24 may be disposed to be inclined with respect to the width direction of the steel sheet.
또한, 상기 팁부(24)가 V자 형태로 꺽여진 구조의 경우, 꺽여진 부분이 강판의 이동방향을 향하거나 강판의 이동방향에 반대방향을 향하도록 역V 자 형태 또는 V자 형태로 배치될 수 있다.In addition, in the case where the tip portion 24 is bent in a V shape, the bent portion may be disposed in an inverted V shape or in a V shape so that the bent portion faces the moving direction of the steel plate or faces the moving direction of the steel plate. Can be.
이와 같이, 강판(P)에 대해 도금층과 접하는 팁부(24)의 배치를 다양하게 함으로써, 도금층 접촉 시 팁부(24)에 가해지는 도금 용액의 하중을 줄여 보다 원활하게 도금층의 부착량을 조절할 수 있게 된다.In this way, by varying the arrangement of the tip portion 24 in contact with the plated layer with respect to the steel plate (P), it is possible to reduce the load of the plating solution applied to the tip portion 24 when the plated layer contacts, thereby more smoothly adjusting the deposition amount of the plated layer. .
도 1과 도 6에 도시된 바와 같이, 상기 와이핑부는 강판 진행방향을 따라 상기 나이프(20) 후단에 배치되어 강판의 도금 부착량을 보다 정밀하게 제어하고 강판의 도금층을 급속 냉각시키는 칠롤(40)을 더 포함할 수 있다.1 and 6, the wiping portion is disposed at the rear end of the knife 20 along the steel plate traveling direction to more precisely control the plating deposition amount of the steel sheet and to rapidly cool the plating layer of the steel sheet 40 It may further include.
상기 칠롤(chill roll)(40)은 강판의 폭방향으로 배치되고 도금층에 가압 밀착되는 롤 구조물이다. 상기 칠롤(40)의 양 선단은 설비 상에 별도의 지지대(도시되지 않음)에 회전가능하게 지지될 수 있다. 상기 칠롤(40)은 자유롭게 회전가능한 구조로 강판의 이동에 따라 같이 회전되거나, 별도의 구동원에 연결되어 설정된 속도로 회전되는 구조일 수 있다. The chill roll 40 is a roll structure that is disposed in the width direction of the steel sheet and is in close contact with the plating layer. Both ends of the chill roll 40 may be rotatably supported by a separate support (not shown) on the installation. The chill roll 40 may be freely rotatable and may be rotated according to the movement of the steel sheet or may be rotated at a set speed by being connected to a separate driving source.
본 실시예에서, 상기 칠롤(40)은 표면조도가 평균 0.1 내지 3um 일 수 있다.In this embodiment, the chill roll 40 may have an average surface roughness of 0.1 to 3um.
상기 칠롤(40)의 표면조도가 3um보다 높게 되면 열위한 표면 품질로 인한 불균일한 후처리 문제가 발생된다. 상기 칠롤(40)의 표면조도가 0.1um 보다 낮은 경우에는 화성처리와 같은 후처리 특성이 저하되는 문제가 발생된다.If the surface roughness of the chill roll 40 is higher than 3um, a non-uniform after-treatment problem occurs due to poor surface quality. If the surface roughness of the chill roll 40 is lower than 0.1um, there is a problem that post-treatment characteristics such as chemical conversion are lowered.
상기 칠롤(40)은 내부로 극저온 액체가 순환되어 저온으로 냉각되는 구조로 되어 있다. 상기 칠롤(40)은 액체 질소 사용에 따른 극저온 환경에서 장시간 안정적으로 사용 가능하도록, 극저온 내구성이 우수한 스테인레스 등의 금속(metal), 세라믹(ceramic) 또는 세라믹 코팅된 금속재 등으로 제조될 수 있다.The chill roll 40 has a structure in which the cryogenic liquid is circulated inside and cooled to a low temperature. The chill roll 40 may be made of metal, ceramic, or ceramic coated metal material having excellent cryogenic durability such that it can be stably used for a long time in a cryogenic environment due to the use of liquid nitrogen.
도 6에 도시된 바와 같이, 상기 칠롤(40) 내부에는 극저온 액체가 지나가도록 유로가 형성된다. 칠롤(40) 내부에 형성되는 유로는 칠롤(40)의 회전축 양 선단을 통해 냉매공급부(도 1의 50 참조)와 연결될 수 있다. 냉매공급부(50)로부터 공급된 극저온 액체는 상기 칠롤(40)의 선단을 통해 칠롤(40) 내부의 유로로 순환 공급된다. 칠롤(40) 내부로 공급된 극저온 액체에 의해 칠롤(40) 표면은 저온의 냉각 상태를 유지한다. 이에, 칠롤(40)은 강판(P)의 도금층에 접한 상태에서 도금용액이 칠롤(40) 표면에 부착되는 것을 방지하고, 도금층을 급속 냉각시킬 수 있게 된다. As shown in FIG. 6, a flow path is formed in the chill roll 40 to allow cryogenic liquid to pass. The flow path formed in the chill roll 40 may be connected to the refrigerant supply unit (see 50 of FIG. 1) through both ends of the rotation shaft of the chill roll 40. The cryogenic liquid supplied from the coolant supply unit 50 is circulated and supplied to the flow path inside the chill roll 40 through the tip of the chill roll 40. The surface of the chill roll 40 is maintained at a low temperature by the cryogenic liquid supplied into the chill roll 40. Thus, the chill roll 40 prevents the plating solution from adhering to the surface of the chill roll 40 in a state of being in contact with the plating layer of the steel sheet P, and rapidly cools the plating layer.
상기 칠롤(40)은 강판(P) 표면의 도금층에 가압 밀착하여 나이프(20)를 거치면서 일차적으로 도금 부착량이 제어된 강판의 도금 부착량을 이차적으로 정밀하게 제어한다. 더불어 상기 칠롤(40)은 강판 도금층에 가압 밀착한 상태로 강판과의 직접적인 열교환을 통해 도금층을 급속 냉각시시킬 수 있게 된다.The chill roll 40 is pressed in close contact with the plating layer on the surface of the steel sheet (P) to control the plating deposition amount of the steel sheet in which the plating deposition amount is primarily controlled while passing through the knife 20. In addition, the chill roll 40 is capable of rapidly cooling the plating layer through direct heat exchange with the steel sheet in a state of being in close contact with the steel plate plating layer.
본 실시예에서, 상기 칠롤(40)은 내부로 극저온 액체를 순환시켜 온도를 -250 내지 5℃로 냉각시킬 수 있다. 상기 칠롤(40)의 온도가 5℃ 보다 높게 되면 도금 강판의 냉각성능 및 표면 품질 개선 효율이 저하되는 문제가 발생된다. 상기 칠롤(40)의 온도가 -250℃ 보다 낮은 경우에는 상기 칠롤(40)의 저온취성 파괴 문제가 발생된다.In the present embodiment, the chill roll 40 may circulate the cryogenic liquid therein to cool the temperature to -250 to 5 ° C. When the temperature of the chill roll 40 is higher than 5 ° C., the cooling performance and the surface quality improvement efficiency of the coated steel sheet are deteriorated. When the chill roll 40 has a temperature lower than −250 ° C., low temperature brittle fracture of the chill roll 40 occurs.
이와 같이, 본 실시예의 도금 장치는 강판 표면의 도금용액에 접촉하는 저온의 나이프(20)와 칠롤(40)을 통해 도금 부착량을 보다 정밀하게 제어하고 도금층의 두께를 조절할 수 있게 된다. 또한, 저온으로 냉각된 칠롤(40)이 도금층을 가압하여 급속 냉각시킴으로서, 도금층의 조직을 미세화시켜 작고 균일한 표면 응고조직을 얻을 수 있으며, 폭방향으로의 도금 부착량 편차나 도금층 조직 편차를 효과적으로 줄이게 된다.As described above, the plating apparatus of the present embodiment can more precisely control the plating adhesion amount and adjust the thickness of the plating layer through the low temperature knife 20 and the chill roll 40 in contact with the plating solution on the surface of the steel sheet. In addition, the chill roll (40) cooled to a low temperature pressurizes the plating layer and rapidly cools the microstructure of the plating layer, thereby making it possible to obtain a small and uniform surface solidification structure, and to effectively reduce the plating deposition amount variation and the plating layer structure variation in the width direction. do.
칠롤(40)이 도금층에 접촉하여 보다 빠른 시간 내에 도금 용액을 응고시킴으로써, 상기 도금 장치는 강판을 20℃/sec 의 냉각 속도로 급냉시킬 수 있게 된다. 또한, 상기 칠롤(40)은 소정의 압력 하에 도금층을 가압하면서 냉각이 진행되므로 난도금성 강종에 대해서도 도금성능을 개선할 수 있게 된다. By the chill roll 40 contacting the plating layer to solidify the plating solution in a faster time, the plating apparatus can quench the steel sheet at a cooling rate of 20 ° C / sec. In addition, the chill roll 40 can improve the plating performance even for the non-plated steel type because the cooling proceeds while pressing the plating layer under a predetermined pressure.
또한, 본 실시예의 경우 도금 욕조(10)의 싱크롤(12)과 칠롤(40)이 연동하여 강판(P)을 지지하고 있는 상태가 되어 강판이 접촉식 나이프(20)를 지나는 과정에서 폭방향으로 굽어지는 반곡 현상이 전혀 발생되지 않는다. 즉, 강판 이동방향을 따라 나이프(20)의 전단과 후단에서 강판은 각각 싱크롤(12)과 칠롤(40)을 지나게 된다. 이에 강판(P)은 싱크롤(12)과 칠롤(40)에 의해 평평하게 펴진 상태로 반곡 현상의 발생없이 나이프(20)를 지나게 된다. In addition, in the present embodiment, the sink roll 12 and the chill roll 40 of the plating bath 10 are interlocked to support the steel sheet P so that the steel sheet passes through the contact knife 20 in the width direction. Bending does not occur at all. That is, the steel sheet passes through the sink roll 12 and the chill roll 40 at the front end and the rear end of the knife 20 in the steel plate moving direction, respectively. Thus, the steel sheet P passes through the knife 20 without the occurrence of the bending phenomenon in the flattened state by the sink roll 12 and the chill roll 40.
강판이 반곡되는 경우, 폭방향으로의 도금 부착량 편차가 발생되고 측면 과도금으로 인한 빗살 무늬 결함 등의 도금 표면 결함이 발생된다. 종래 구조의 경우 이러한 강판 반곡 현상에 따른 도금 표면 결함이 빈번하게 발생되나, 본 실시예의 경우 강판의 반곡 발생을 방지함으로써, 폭방향의 도금 부착량 및 도금층 조직 편차가 거의 없는 도금 강판의 제조가 가능하다. When the steel sheet is bent, the plating adhesion amount deviation in the width direction occurs, and plating surface defects such as comb defects due to side over plating occur. In the conventional structure, plating surface defects frequently occur due to the bending of the steel sheet, but in the present embodiment, by preventing bending of the steel sheet, it is possible to manufacture a coated steel sheet having almost no plating deposition amount and plating layer structure deviation in the width direction. .
본 실시예의 와이핑부는 상기 칠롤(40)에 의한 도금 부착량의 정밀 제어를 위해, 나이프와 마찬가지로 상기 칠롤(40)에 구비되어 강판에 대한 칠롤(40)의 접촉 하중을 검출하는 로드센서(30), 및 상기 로드센서의 검출신호에 따라 구동부(34)를 작동하여 강판에 대해 칠롤(40)을 이동하여 강판에 대한 칠롤(40)의 가압력을 제어하는 제어부(32)를 더 포함할 수 있다.The wiping part of the present embodiment is provided on the chill roll 40 like a knife for precise control of the plating adhesion amount by the chill roll 40 and detects a contact load of the chill roll 40 against the steel sheet. And a control unit 32 for controlling the pressing force of the chill roll 40 against the steel sheet by moving the chill roll 40 with respect to the steel sheet by operating the driving unit 34 according to the detection signal of the load sensor.
상기 칠롤(40)이 강판(P)의 도금층으로 접근하거나 도금층에서 외측으로 이격됨으로써, 칠롤(40)과 강판과의 간격이 달라져 강판의 도금 부착량과 도금층의 두께가 정밀하게 조절된다.As the chill roll 40 approaches the plating layer of the steel sheet P or is spaced outward from the plating layer, the gap between the chill roll 40 and the steel sheet is changed to precisely control the plating adhesion amount of the steel sheet and the thickness of the plating layer.
칠롤(40)에 대한 로드센서와 제어부의 구조는 위에서 언급한 나이프(20)에 대한 로드센서(30)와 제어부(32) 및 구동부(34)의 구조와 동일하므로 동일한 부호를 사용하고, 그 구조와 작용은 나이프(20)에 대한 로드센서(30)와 제어부(32)의 설명을 참조하며, 이하 상세한 설명은 생략한다. 이에, 상기 제어부(32)는 로드센서(30)의 검출값을 연산하여 강판에 대해 칠롤(40)을 이동시켜 도금층을 가압함으로써, 도금 부착량과 이에 따른 도금층 두게를 보다 정밀하게 제어할 수 있다. 또한, 칠롤에 의해 도금층이 가압되면서 20℃/sec 이상의 냉각속도로 급냉됨으로써, 폭방향 도금 부착량 편차를 최소화하면서 보다 미세한 조직의 도금층을 얻을 수 있게 된다.The structure of the load sensor and the control unit for the chill roll 40 is the same as that of the load sensor 30 and the control unit 32 and the drive unit 34 for the knife 20 mentioned above, and the same reference numerals are used, and the structure thereof. And the action refers to the description of the load sensor 30 and the control unit 32 for the knife 20, the detailed description thereof will be omitted. Thus, the control unit 32 may calculate the detection value of the load sensor 30 to move the chill roll 40 against the steel sheet to press the plating layer, thereby more precisely controlling the amount of plating and the thickness of the plating layer accordingly. In addition, as the plating layer is pressed by the chill roll and quenched at a cooling rate of 20 ° C./sec or more, it is possible to obtain a plating layer having a finer structure while minimizing the variation in the width direction plating amount.
또한, 상기 와이핑부는 칠롤(40) 표면이 오염되었을 경우에 대비하여 칠롤(40) 표면의 오염물을 제거하는 구조로 되어 있다. 이를 위해, 도 7에 도시된 바와 같이, 상기 와이핑부는 칠롤(40)에 접하여 칠롤(40) 표면에 부착된 오염물을 제거하기 위한 스크레퍼(44)를 더 포함할 수 있다. 상기 스크레퍼(44)는 칠롤(40)의 축방향으로 연장되어 칠롤(40) 표면에 접촉되도록 설치될 수 있다. 이에, 상기 칠롤(40)이 회전되면서 칠롤(40) 표면에 부착된 오염물이 스크레퍼(44)에 걸려 칠롤(40) 표면에서 제거된다.In addition, the wiping unit is configured to remove contaminants on the surface of the chill roll 40 in case the surface of the chill roll 40 is contaminated. To this end, as shown in FIG. 7, the wiping unit may further include a scraper 44 in contact with the chill roll 40 to remove contaminants attached to the surface of the chill roll 40. The scraper 44 may be installed to extend in the axial direction of the chill roll 40 to contact the surface of the chill roll 40. As a result, as the chill roll 40 is rotated, contaminants attached to the chill roll 40 surface are caught by the scraper 44 and removed from the chill roll 40 surface.
상기 와이핑부를 거쳐 도금 부착량이 정밀 조절되고 급냉이 이루어진다. 강판은 와이핑부 후단에 배치된 냉각부를 거치면서 설정 온도 이하로 급속 냉각되며, 도금층 두께가 정밀하게 제어된다. The coating amount is precisely adjusted and quenched through the wiping part. The steel sheet is rapidly cooled below the set temperature while passing through the cooling unit disposed at the rear end of the wiping unit, and the thickness of the plating layer is precisely controlled.
도 7과 도 8은 본 실시예에 따른 냉각부의 구조를 예시하고 있다.7 and 8 illustrate the structure of the cooling unit according to the present embodiment.
상기 냉각부는 강판 표면의 도금층에 밀착하여 도금층을 냉각하는 적어도 하나 이상의 냉각체(60), 및 상기 냉각체(60)로 액체 질소나 액체 헬륨을 포함하는 극저온 액체를 공급하여 냉각체(60)를 냉각하는 냉매공급부(50)를 포함할 수 있다.The cooling unit adheres to the plating layer on the surface of the steel sheet to supply at least one cooling body 60 to cool the plating layer, and to supply the cryogenic liquid including liquid nitrogen or liquid helium to the cooling body 60 to supply the cooling body 60. It may include a refrigerant supply unit 50 for cooling.
본 실시예에서, 상기 냉각체(60)는 강판 폭방향으로 연장되고 내부에는 극저온 액체가 순환되며 강판(P) 표면의 도금층에 가압되어 냉기를 가하는 냉각롤(62)을 포함할 수 있다. 상기 냉각롤(62)은 복수개가 강판의 진행방향을 따라 간격을 두고 다단으로 배치된 구조일 수 있다.In the present embodiment, the cooling body 60 may include a cooling roll 62 extending in the width direction of the steel sheet and having a cryogenic liquid circulated therein and pressurized to the plating layer on the surface of the steel sheet P to apply cold air. The cooling rolls 62 may have a structure in which a plurality of cooling rolls 62 are arranged in multiple stages at intervals along a traveling direction of the steel sheet.
상기 냉각롤(62)은 상기 칠롤(40)과 마찬가지로 강판의 폭방향으로 배치되는 롤 구조물이다. 상기 냉각롤(62)의 양 선단은 설비 상에 별도의 지지대(도시되지 않음)에 회전가능하게 지지될 수 있다. 상기 냉각롤(62)은 자유롭게 회전가능한 구조로 강판의 이동에 따라 같이 회전되거나, 별도의 구동원에 연결되어 설정된 속도로 회전되는 구조일 수 있다. The cooling roll 62 is a roll structure that is disposed in the width direction of the steel sheet similarly to the chill roll 40. Both ends of the cooling roll 62 may be rotatably supported by a separate support (not shown) on the installation. The cooling roll 62 may be freely rotatable and may be rotated according to the movement of the steel sheet or may be rotated at a set speed by being connected to a separate driving source.
상기 냉각롤(62)은 내부로 극저온 액체가 순환되어 저온으로 냉각되는 구조로 되어 있다. The cooling roll 62 has a structure in which the cryogenic liquid is circulated and cooled to low temperature.
칠롤(40)과 마찬가지로 상기 냉각롤(62) 내부에는 극저온 액체가 지나가도록 유로(64)가 형성된다. 냉각롤(62) 내부에 형성되는 유로(64)는 냉각롤(62)의 회전축 양 선단을 통해 냉매공급부(도 1의 50 참조)와 연결될 수 있다. 냉매공급부(50)로부터 공급된 극저온 액체는 상기 냉각롤(62)의 선단을 통해 냉각롤(62) 내부의 유로(64)로 순환 공급된다. 냉각롤(62) 내부로 공급된 극저온 액체에 의해 냉각롤(62) 표면은 저온의 냉각 상태를 유지한다.Like the chill roll 40, the cooling roll 62 has a flow path 64 formed therein to allow the cryogenic liquid to pass therethrough. The flow path 64 formed in the cooling roll 62 may be connected to the refrigerant supply unit (see 50 of FIG. 1) through both ends of the rotation shaft of the cooling roll 62. The cryogenic liquid supplied from the coolant supply unit 50 is circulated and supplied to the flow path 64 inside the cooling roll 62 through the tip of the cooling roll 62. The surface of the cooling roll 62 is maintained at a low temperature by the cryogenic liquid supplied into the cooling roll 62.
또한, 상기 냉각체(60)는 적어도 두 개의 냉각롤(62) 사이에 감겨져 설치되고 강판(P) 표면의 도금층에 가압 밀착하여 냉기를 가하는 냉각벨트(66)를 더 포함할 수 있다. 이러한 구조의 경우 냉각롤(62)이 아닌 냉각벨트(66)가 강판의 도금층에 직접 접하게 된다.In addition, the cooling body 60 may further include a cooling belt 66 that is wound and installed between at least two cooling rolls 62 and presses and adheres to the plating layer on the surface of the steel sheet P to apply cold air. In this structure, the cooling belt 66, not the cooling roll 62, is in direct contact with the plated layer of the steel sheet.
상기 냉각롤(62)과 상기 냉각벨트(66)는 액체 질소 사용에 따른 극저온 환경에서 장시간 안정적으로 사용 가능하도록, 극저온 내구성이 우수한 스테인레스 등의 금속(metal), 세라믹(ceramic) 또는 세라믹 코팅된 금속재 등으로 제조될 수 있다.The cooling roll 62 and the cooling belt 66 are metal, ceramic, or ceramic coated metal such as stainless steel having excellent cryogenic durability, so that the cooling roll 62 and the cooling belt 66 can be stably used in a cryogenic environment due to the use of liquid nitrogen. Or the like.
본 실시예에서, 상기 강판 표면에 접하는 냉각롤(62) 또는 냉각벨트(66)는 표면조도가 평균 0.1 내지 3um 일 수 있다. 상기 냉각롤(62) 또는 냉각벨트(66)의 표면조도가 3um보다 높게 되면 열위한 표면 품질로 인한 불균일한 후처리 문제가 발생되며, 표면조도가 0.1um 보다 낮은 경우에는 화성처리와 같은 후처리 특성이 저하되는 문제가 발생된다.In this embodiment, the cooling roll 62 or the cooling belt 66 in contact with the surface of the steel sheet may have an average surface roughness of 0.1 to 3um. If the surface roughness of the cooling roll 62 or the cooling belt 66 is higher than 3um, non-uniform after-treatment problems may occur due to poor surface quality, and if the surface roughness is lower than 0.1um, post-treatment such as chemical conversion The problem that a characteristic falls is produced.
본 실시예에서, 두 개의 냉각롤(62)에 냉각벨트(66)가 감겨져 하나의 냉각체(60)를 이루며, 이러한 냉각체(60) 하나 또는 복수개가 강판의 진행방향을 따라 간격을 두고 배치된 구조로 되어 있다. 각 냉각체(60)의 설치 간격이나 개수 등은 설비나 공정 조건에 따라 다양하게 변형 가능하다. In this embodiment, the cooling belts 66 are wound around the two cooling rolls 62 to form one cooling body 60, and one or more of these cooling bodies 60 are disposed at intervals along the advancing direction of the steel sheet. Structure. Installation intervals and the number of the respective cooling bodies 60 can be variously modified depending on the facilities and process conditions.
각 냉각체(60)는 동일한 구조로 이루어질 수 있으며, 이하 일측 냉각체에 대한 구조를 예로서 설명한다.Each of the cooling bodies 60 may have the same structure, and the structure of one cooling body will be described below as an example.
이격된 두 개의 냉각롤(62) 사이에 냉각벨트(66)가 감겨져 설치되고, 냉각벨트(66)는 강판 표면의 도금층에 면접촉된다. 상기 냉각벨트(66)는 예를 들어, 강판에 접한 상태에서 냉각롤(62)의 회전구동에 의해 강판의 이동 속도에 맞춰 회전될 수 있다. 강판의 이동 속도에 맞춰 냉각벨트(66)가 회전됨으로써, 강판과 냉각벨트(66) 사이의 마찰을 최소화하고 마찰에 의한 도금층 손상을 방지할 수 있다.The cooling belt 66 is wound around the two cooling rolls 62 spaced apart from each other, and the cooling belt 66 is in surface contact with the plating layer on the surface of the steel sheet. The cooling belt 66 may be rotated according to the moving speed of the steel sheet by, for example, the rotational drive of the cooling roll 62 in contact with the steel sheet. By rotating the cooling belt 66 in accordance with the moving speed of the steel sheet, it is possible to minimize the friction between the steel sheet and the cooling belt 66 and to prevent the plating layer damage due to the friction.
냉각롤(62)은 외측의 구비된 냉각벨트(66)를 저온으로 냉각시키게 된다. 냉각벨트(66)는 냉각롤(62)에 의해 저온으로 냉각된 상태로 도금층에 면접촉하고 있어, 도금층을 급속 냉각시킬 수 있게 된다. 즉, 상기 냉각벨트(66)는 두 개의 냉각롤(62) 사이에서 강판 표면의 도금층에 면접촉하고 있다. 이에, 강판의 도금층에 대한 냉각 면적은 냉각벨트(66)에 의한 접촉면적만큼 커지게 된다. 따라서, 본 실시예의 냉각부는 냉각벨트(66)를 통해 강판 도금층에 대한 냉각 면적을 늘려 냉각 속도를 높일 수 있게 된다.The cooling roll 62 cools the provided cooling belt 66 to a low temperature. The cooling belt 66 is in surface contact with the plating layer in a state of being cooled to a low temperature by the cooling roll 62, so that the plating layer can be rapidly cooled. That is, the cooling belt 66 is in surface contact with the plated layer on the surface of the steel sheet between the two cooling rolls (62). Thus, the cooling area of the plated layer of the steel sheet is increased by the contact area by the cooling belt 66. Therefore, the cooling unit of the present embodiment can increase the cooling area for the steel plate plated layer through the cooling belt 66 to increase the cooling rate.
본 실시예에서, 상기 냉각롤(62)은 내부로 극저온 액체를 순환시켜 도금층과 접하는 냉각벨트(66)의 온도를 -250 내지 5℃로 냉각시킬 수 있다. 상기 냉각벨트(66)의 온도가 5℃ 보다 높게 되면 도금 강판의 냉각성능 및 표면 품질 개선 효율이 저하되는 문제가 발생된다. 상기 냉각벨트(66)의 온도가 -250℃ 보다 낮은 경우에는 상기 냉각벨트(66)의 저온취성 파괴 문제가 발생된다.In this embodiment, the cooling roll 62 may circulate the cryogenic liquid therein to cool the temperature of the cooling belt 66 in contact with the plating layer to -250 to 5 ° C. When the temperature of the cooling belt 66 is higher than 5 ℃ causes a problem that the cooling performance and surface quality improvement efficiency of the coated steel sheet is lowered. When the temperature of the cooling belt 66 is lower than -250 ℃ problem of low temperature brittle fracture of the cooling belt 66 occurs.
이와 같이, 냉각롤(62)에 설치된 냉각벨트(66)가 도금층에 접촉하여 보다 빠른 시간 내에 도금 용액을 급속 응고시킴으로써, 본 실시예의 도금 장치는 냉각부를 통해 강판을 20℃/sec 의 냉각 속도로 250℃ 이하의 온도까지 급냉시킬 수 있게 된다.As such, the cooling belt 66 provided on the cooling roll 62 contacts the plating layer and rapidly solidifies the plating solution within a faster time, so that the plating apparatus of the present embodiment cools the steel sheet through the cooling section at a cooling rate of 20 ° C / sec. It can be quenched to the temperature below 250 degreeC.
상기 냉각부는 유닛을 구성하는 두 개의 냉각롤(62) 사이의 간격을 조절하여 냉각벨트(66)를 팽팽하게 긴장시킬 수 있다. 냉각벨트(66)가 긴장되어 팽팽하게 펼쳐짐에 따라 강판 표면의 도금층과 냉각벨트(66)의 접촉 및 가압력이 균일하게 이루어지고 도금층을 보다 고르게 가압 냉각시킬 수 있게 된다. The cooling unit may tension the cooling belt 66 by adjusting a gap between two cooling rolls 62 constituting the unit. As the cooling belt 66 is tensioned and unfolded, the plating layer on the surface of the steel sheet and the cooling belt 66 are in contact with each other and the pressing force is uniform, and the plated layer can be pressure-cooled more evenly.
도 8에 도시된 바와 같이, 이를 위해 상기 냉각부는 냉각벨트(66)가 감겨진 두 개의 냉각롤(62) 사이에 냉각롤(62) 사이를 신축시키는 구동실린더(68)가 설치될 수 있다. 상기 구동실린더(68)는 제어부(32)의 신호에 따라 구동되어 냉각롤(62) 사이를 벌리게 된다. 냉각롤(62) 사이가 벌어짐에 따라 냉각벨트(66)가 팽팽하게 펼쳐지게 된다.As shown in FIG. 8, for this purpose, a driving cylinder 68 may be installed between the cooling rolls 62 between the two cooling rolls 62 in which the cooling belt 66 is wound. The driving cylinder 68 is driven in accordance with the signal of the control unit 32 to be separated between the cooling roll 62. As the gap between the cooling rolls 62 opens, the cooling belt 66 is stretched taut.
또한, 상기 냉각롤(62)은 강판의 도금층에 대한 가압력을 정밀하게 조절할 수 있다. 이를 위해, 상기 냉각롤(62)은 도시되지 않았으나, 칠롤(40)과 동일하게 로드센서와 제어부 및 구동부를 구비할 수 있다. 냉각롤의 가압력 조절 구조는 위에서 언급한 칠롤(40)에 대한 로드센서(30)와 제어부(32) 및 구동부(34)의 구조와 동일하므로, 그 구조와 작용에 대한 상세한 설명은 생략한다. 이에, 냉각롤은 설정된 압력으로 냉각벨트를 강판에 가압 밀착시켜 강판의 도금층 두께를 정밀하게 제어하게 된다.In addition, the cooling roll 62 can precisely adjust the pressing force on the plated layer of the steel sheet. To this end, the cooling roll 62 is not shown, but may be provided with a load sensor, a control unit and a driving unit in the same manner as the chill roll 40. The pressing force adjusting structure of the cooling roll is the same as the structure of the load sensor 30 and the control unit 32 and the driving unit 34 for the chill roll 40 mentioned above, and a detailed description thereof will be omitted. Thus, the cooling roll is pressed tightly to the cooling belt at a set pressure to precisely control the thickness of the plated layer of the steel sheet.
즉, 상기 냉각롤(62)이 강판의 도금층으로 접근하거나 도금층에서 외측으로 이격됨으로써, 냉각롤(62)에 감겨진 냉각벨트(66)와 강판과의 간격이 달라져 강판의 도금층에 대한 가압력이 조절된다. 이와 같이, 상기 냉각부는 로드센서의 검출값을 연산하여 강판에 대해 냉각롤(62)을 이동시켜 냉각벨트(66)에 의한 도금층 가압력을 정밀하게 조절함으로써, 도금층 두께를 정밀하게 제어할 수 있게 된다.That is, as the cooling roll 62 approaches the plating layer of the steel sheet or is spaced outward from the plating layer, the gap between the cooling belt 66 wound on the cooling roll 62 and the steel sheet is changed to adjust the pressing force on the plating layer of the steel sheet. do. As described above, the cooling unit calculates the detection value of the load sensor to move the cooling roll 62 with respect to the steel sheet to precisely adjust the plated layer pressing force by the cooling belt 66, thereby precisely controlling the thickness of the plated layer. .
여기서, 상기 냉각롤(62)의 이동에 따른 냉각벨트(66)의 가압력은 강판의 이동방향을 따라 배치된 복수개의 냉각체(60) 각각에 대해 동일하거나 상이할 수 있다. 즉, 강판의 이동 방향을 따라 배치된 각 냉각체(60)는 동일한 가압력으로 강판에 밀착될 수 있다. 또는 상기 각 냉각체(60)는 강판의 이동방향을 따라 점차적으로 가압력을 높여 강판에 밀착될 수 있다. 이러한 구조의 경우, 강판은 각 냉각체(60)를 지나면서 점차적으로 높은 가압력을 받아 도금층 두께를 점차적으로 줄일 수 있게 된다.Here, the pressing force of the cooling belt 66 according to the movement of the cooling roll 62 may be the same or different for each of the plurality of cooling bodies 60 arranged along the moving direction of the steel sheet. That is, each of the cooling bodies 60 arranged along the moving direction of the steel sheet may be in close contact with the steel sheet with the same pressing force. Alternatively, the cooling bodies 60 may be in close contact with the steel sheet by gradually increasing the pressing force along the moving direction of the steel sheet. In the case of such a structure, the steel sheet receives a progressively high pressing force while passing through each cooling body 60 to gradually reduce the thickness of the plating layer.
이에, 상기 강판의 이동방향을 따라 상기 나이프(20)에서 냉각부로 가면서 점차적으로 도금층 두께를 줄여 보다 정밀하게 도금층 두께를 제어할 수 있게 된다.As a result, the thickness of the plating layer may be gradually reduced by going from the knife 20 to the cooling unit along the moving direction of the steel sheet, thereby more precisely controlling the plating layer thickness.
또한, 상기 냉각부는 소정의 압력 하에 도금층을 가압하면서 도금층을 급냉시킴으로써, 난도금성 강종에 대해서도 도금성능을 개선할 수 있게 된다. 또한, 상기 냉각부는 강판의 진행방향을 따라 후단쪽 마지막에 배치된 냉각롤 또는 냉각벨트를 통해 최종적으로 강판 도금층의 표면 조도를 제어할 수 있다. 따라서, 보다 고 품질의 제품을 생산할 수 있게 된다.In addition, by cooling the plated layer while pressing the plated layer under a predetermined pressure, the cooling unit can improve the plating performance even for non-plated steel grades. In addition, the cooling unit may finally control the surface roughness of the steel plate plating layer through a cooling roll or a cooling belt disposed at the end of the rear end in the traveling direction of the steel sheet. Thus, higher quality products can be produced.
이와 같이, 본 실시예의 도금 장치는 극저온 액체에 의해 냉각된 냉각벨트를 도금층에 밀착시켜 냉각시킴으로써, 종래와 비교하여 도금층을 급속 냉각시킬 수 있게 된다. 도금 강판 냉각은 제품의 표면 품질에 직접적인 영향을 미친다. 만약 미응고 도금층이 오염된 가스 또는 설비 후단의 롤에 접촉되는 경우 직접적인 표면 결함 발생의 원인이 되기 때문에 도금층은 설비 후단으로 진입하기 전에 완전히 응고되어야 한다. 종래 구조의 경우 가스나 수냉방식을 이용함에 따라 열용량이 낮아 냉각능력이 떨어지고, 이에 도금강판을 일정 온도 이하로 냉각시켜 도금층을 완전히 응고시키기 위해서는 매우 긴 다단계의 냉각라인을 필요로 하였다. 따라서 종래에는 냉각 라인이 상당히 복잡하고 설비 규모가 방대하여 설비를 효과적으로 관리하기 어려워 표면 결함 발생이 빈번하였다. 특히, Zn 도금 용액에 Al, Mg가 다량 첨가된 합금도금 강판과 같이 도금층의 응고 시작 온도와 응고 완료 온도 차가 큰 경우에는 종래의 가스를 이용한 방식으로는 충분한 냉각효과를 얻기 어렵다. 이에, 도금층의 냉각이 제대로 이루어지지 못해, 강산화성 금속인 Al, Mg 함유 조대하고 취약한 도금층 조직이 생성되며, 이러한 영역에서 흑점, 흑변과 같은 도금층 표면 결합이 발생되고 도금층 크랙발생 및 내식성 저하의 문제를 유발하게 된다.As described above, the plating apparatus of the present embodiment can rapidly cool the plating layer in comparison with the prior art by closely cooling the cooling belt cooled by the cryogenic liquid to the plating layer. Plated steel sheet cooling has a direct impact on the surface quality of the product. If the uncondensed plating layer comes in contact with contaminated gas or rolls in the rear of the installation, the plating layer must be completely solidified before entering the rear of the installation, as this causes direct surface defects. In the case of the conventional structure by using the gas or water cooling method, the heat capacity is low, the cooling capacity is lowered, and in order to cool the plated steel sheet below a certain temperature to completely solidify the plated layer required a very long multi-stage cooling line. Therefore, in the related art, the cooling line is considerably complicated and the size of the facility is so large that it is difficult to effectively manage the facility, so that surface defects are frequently generated. In particular, when the difference between the solidification start temperature and the solidification completion temperature of the plating layer is large, such as an alloy plated steel sheet in which a large amount of Al and Mg are added to the Zn plating solution, it is difficult to obtain a sufficient cooling effect using a conventional gas method. Accordingly, the cooling of the plating layer is not properly performed, and a coarse and fragile plating layer structure containing Al and Mg, which is a strong oxidizing metal, is generated. In this region, plating layer surface bonding such as black spots and black edges occurs, and problems of plating layer cracking and deterioration of corrosion resistance are generated. Will cause.
이에 반해, 본 실시예의 경우, 강판의 도금층에 직접 냉각벨트(66)가 접촉하여 극저온 액체 의한 냉각능을 도금층에 가함으로써, 냉각효율을 보다 높일 수 있게 된다. 이에, 도금층 냉각에 소요되는 시간을 크게 단축시킬 수 있게 된다. 따라서, 본 실시예에 따라 도금 강판의 냉각속도가 20℃/sec 이상으로 높아져 냉각부의 설비라인을 보다 줄일 수 있게 된다. 또한, 강판에 가스가 직접적으로 접촉하지 않아 표면 결함 발생을 최소화할 수 있고, 보다 작고 균일한 표면 조직을 얻어 고품질의 도금 강판 제조가 가능하다. 또한, 냉각용 가스를 사용하지 않아 환경에 유해한 분진 발생을 방지할 수 있게 된다. On the contrary, in the present embodiment, the cooling belt 66 directly contacts the plating layer of the steel sheet, thereby applying the cooling ability by the cryogenic liquid to the plating layer, thereby further increasing the cooling efficiency. As a result, the time required for cooling the plating layer can be greatly shortened. Therefore, according to the present embodiment, the cooling rate of the plated steel sheet is increased to 20 ° C./sec or more, thereby further reducing the facility line of the cooling unit. In addition, since gas is not directly in contact with the steel sheet, it is possible to minimize the occurrence of surface defects, and to obtain a smaller and more uniform surface structure, thereby manufacturing a high quality coated steel sheet. In addition, it is possible to prevent the generation of dust harmful to the environment by not using the cooling gas.
또한, 본 실시예에서, 상기 냉각벨트(66)는 도금 강판의 도금층을 가압하여 냉각하는 과정에서 도금층에 패턴을 각인하여 형성하는 구조일 수 있다. 여기서 패턴이라 함은 반복적인 문양이나 무늬를 의미할 수 있다. In addition, in the present embodiment, the cooling belt 66 may have a structure formed by stamping a pattern on the plating layer in the process of pressing and cooling the plating layer of the plated steel sheet. Here, the pattern may mean a repetitive pattern or pattern.
도금강판의 도금층은 냉각을 위해 도금층과 접촉하고 있는 냉각벨트의 표면 형상에 영향을 받으므로, 냉각벨트에 다양한 패턴을 형성시켜 전사시키는 구조를 통해 도금층 표면을 가공할 수 있다. 이를 위해, 상기 냉각벨트(66)는 표면에 도금층에 전사될 패턴이 형성될 수 있다. 이에, 냉각벨트가 도금층에 가압 밀착되어 도금층을 냉각하는 과정에서, 냉각벨트 표면에 형성된 패턴이 도금층에 눌려져 전사되면서 도금층에 냉각벨트의 패턴과 동일한 형태의 패턴이 형성된다. Since the plated layer of the plated steel sheet is influenced by the surface shape of the cooling belt in contact with the plated layer for cooling, the surface of the plated layer may be processed through a structure in which various patterns are formed on the cooling belt and transferred. To this end, the cooling belt 66 may be a pattern to be transferred to the plating layer on the surface. Thus, in the process of cooling the plating layer by pressing the cooling belt in close contact with the plating layer, the pattern formed on the surface of the cooling belt is pressed and transferred to the plating layer, thereby forming a pattern having the same shape as the pattern of the cooling belt on the plating layer.
이와 같이, 도금강판의 도금층에 냉각벨트를 접촉시켜 급속 냉각시킴으로써, 별도의 패턴 형성을 위한 장치를 거치지 않고 도금층에 패턴을 용이하게 형성할 수 있게 된다.As such, by rapidly cooling the contacting cooling belt to the plated layer of the plated steel sheet, a pattern can be easily formed on the plated layer without going through an apparatus for forming a separate pattern.
이하, 본 실시예에 따른 도금 공정에 대해 설명한다.Hereinafter, the plating process which concerns on a present Example is demonstrated.
본 실시예에 따라 도금 욕조를 거쳐 용융 아연이 도금된 강판은 도금 욕조 상부로 이동되어 강판의 도금 부착량을 조절하는 공정과 강판을 냉각하는 공정을 거쳐 도금강판으로 제조된다.According to the present embodiment, the steel plate coated with molten zinc through the plating bath is moved to the upper portion of the plating bath to manufacture a plated steel sheet through a process of adjusting the plating adhesion amount of the steel plate and a process of cooling the steel plate.
강판의 도금 부착량을 조절하기 위해, 도금 욕조에서 나온 강판은 일차적으로 강판 표면의 도금층에 접촉하는 저온의 나이프에 의해 일차적으로 도금 부착량이 제어된다. 그리고 나이프의 후단에서 강판 표면 도금층에 접촉하는 저온의 칠롤에 의해 이차적으로 도금 부착량이 제어된다. In order to adjust the plating deposition amount of the steel sheet, the steel sheet coming out of the plating bath is primarily controlled by the low temperature knife contacting the plating layer on the surface of the steel sheet. Then, the plating deposition amount is secondarily controlled by the low temperature chill roll in contact with the steel plate surface plating layer at the rear end of the knife.
상기 나이프와 칠롤에 의한 도금 부착량 조절은, 강판에 대한 나이프와 칠롤의 접촉 하중을 검출하고, 검출된 접촉 하중에 따라 강판에 대해 나이프와 칠롤을 이동시켜 가압력을 제어함으로써, 정밀하게 조절할 수 있다. The coating amount adjustment by the knife and the chill roll can be precisely controlled by detecting the contact load between the knife and the chill roll with respect to the steel sheet, and controlling the pressing force by moving the knife and the chill roll with respect to the steel sheet in accordance with the detected contact load.
상기 나이프와 칠롤은 내부로 액체 질소 등의 극저온 액체가 공급되어 저온으로 냉각된다. 나이프로 공급된 극저온 액체에 의해 나이프에 설치된 팁부는 5℃ 이하의 온도로 냉각된다. 이에, 팁부가 도금층에 접촉하여 도금 부착량을 조절하는 상태에서 도금 용액이 저온으로 냉각된 팁부에 융착되지 않는다. 따라서, 나이프는 팁부를 물리적으로 도금층에 접촉한 상태에서 도금층의 도금 부착량을 정확하게 제어할 수 있게 된다. 이와 같이 도금 욕조에서 나온 강판은 나이프에 의해 일차적으로 도금층의 도금 부착량이 제어된다. The knife and chill roll are cooled to a low temperature by supplying a cryogenic liquid such as liquid nitrogen. The tip portion provided to the knife is cooled to a temperature of 5 ° C or lower by the cryogenic liquid supplied to the knife. As a result, the plating solution is not fused to the tip portion cooled to a low temperature in a state in which the tip portion contacts the plating layer to adjust the plating deposition amount. Therefore, the knife can accurately control the plating adhesion amount of the plating layer in a state where the tip portion is in physical contact with the plating layer. In this way, the plated amount of the plated layer of the steel sheet from the plating bath is controlled by the knife.
칠롤은 일차적으로 나이프에 의해 부착량이 제어된 강판의 도금층에 접촉되어 도금층을 물리적으로 가압함으로써, 도금 부착량을 이차적으로 보다 정밀하게 제어한다. The chill roll primarily contacts the plating layer of the steel sheet whose deposition amount is controlled by the knife and physically pressurizes the plating layer, thereby controlling the plating deposition amount more precisely.
칠롤 역시 내부로 공급된 극저온 액체에 의해 저온으로 냉각되어 있어서, 도금층에 접촉되는 칠롤의 표면은 5℃ 이하로 냉각된다. 이에, 칠롤이 도금층에 밀착되어 가압하는 상태에서 도금용액이 칠롤 표면에 부착되지 않는다. 따라서, 칠롤을 도금층에 가압하여 도금층의 도금 부착량을 정밀하게 제어하고, 강판의 도금층 두께를 조절할 수 있게 된다.The chill roll is also cooled to low temperature by the cryogenic liquid supplied therein, so that the surface of the chill roll in contact with the plating layer is cooled to 5 ° C or lower. Thus, the plating solution does not adhere to the chill roll surface in the state where the chill roll is pressed against the plating layer and pressed. Therefore, by pressing the chill roll on the plating layer, it is possible to precisely control the plating adhesion amount of the plating layer, and to adjust the thickness of the plating layer of the steel sheet.
칠롤에 의해 강판이 가압되어 도금 부착량이 제어되는 과정에서 저온의 칠롤에 의해 강판의 도금층이 급속하게 냉각된다. 칠롤은 언급한 바와 같이 극저온 액체에 의해 냉각된 상태로 칠롤과 접촉하고 있는 도금층이 칠롤과 열교환되면서 급속하게 냉각된다. 이와 같이, 칠롤이 도금층과 접하여 도금층을 냉각시킴으로써, 상기 도금 강판은 20℃/sec 이상의 냉각속도로 급냉될 수 있다.The plated layer of the steel sheet is rapidly cooled by a chilled chill roll while the steel sheet is pressed by the chill roll to control the coating amount. The chill roll is rapidly cooled as the plating layer in contact with the chill roll heats up with the chill roll while being cooled by the cryogenic liquid as mentioned. In this way, the chill roll is in contact with the plating layer to cool the plating layer, the plated steel sheet can be quenched at a cooling rate of 20 ° C / sec or more.
칠롤을 지나면서 급속 냉각된 강판은 칠롤 후단에 배치된 냉각구간을 지나면서 설정 온도 이하로 급냉된다. The steel sheet rapidly cooled while passing through the chill roll is quenched below a set temperature while passing through a cooling section disposed at the rear end of the chill roll.
냉각구간에는 냉각체로써 냉각롤과 냉각벨트를 포함하여 구성된 유닛 복수개가 연속적으로 배치되고, 각 유닛의 냉각벨트가 강판 표면의 도금층에 가압 밀착되어 있다. In the cooling section, a plurality of units including a cooling roll and a cooling belt are continuously arranged as the cooling body, and the cooling belt of each unit is pressed against the plated layer on the surface of the steel sheet.
냉각롤은 칠롤과 같이, 내부로 액체 질소 등의 극저온 액체가 공급되어 저온으로 냉각된다. 냉각롤의 냉기는 냉각벨트를 통해 도금층에 가해져 도금층을 급냉시키게 된다.The chill roll, like the chill roll, is supplied with a cryogenic liquid such as liquid nitrogen to the inside, and cooled to a low temperature. Cold air of the cooling roll is applied to the plating layer through the cooling belt to quench the plating layer.
냉각벨트는 극저온 액체에 의해 저온으로 냉각되어 냉각벨트가 도금층에 가압된 상태에서 도금층이 냉각벨트에 부착되지 않는다. The cooling belt is cooled to low temperature by the cryogenic liquid so that the plating layer is not attached to the cooling belt while the cooling belt is pressed against the plating layer.
상기 냉각벨트는 강판의 도금층을 적정 압력으로 가압한 상태로 도금층을 냉각시키게 된다. 강판에 대한 냉각벨트의 가압력 조절은, 강판에 대한 냉각벨트의 접촉 하중을 검출하고, 검출된 접촉 하중에 따라 강판에 대해 냉각벨트를 이동시켜 가압력을 정밀하게 제어할 수 있다. The cooling belt cools the plating layer in a state in which the plating layer of the steel sheet is pressed at an appropriate pressure. Adjusting the pressing force of the cooling belt with respect to the steel sheet can detect the contact load of the cooling belt with respect to the steel sheet, and move the cooling belt with respect to the steel sheet according to the detected contact load to precisely control the pressing force.
이에, 칠롤을 거친 도금 강판은 냉각구간을 지나면서 냉각벨트에 의해 냉각되어 20℃/sec 이상의 냉각속도로 250℃ 이하의 온도까지 급냉될 수 있다.Thus, the plated steel sheet subjected to the chill roll may be cooled by a cooling belt while passing through a cooling section, and may be quenched to a temperature of 250 ° C. or less at a cooling rate of 20 ° C./sec or more.
도금 부착량 조절 과정과 도금층 냉각 과정을 거치면서 칠롤과 냉각벨트가 도금층을 직접 접하여 가압함에 따라, 강판의 이동방향을 따라 강판의 도금층 두께를 점차 줄여, 강판의 도금층 두께를 보다 정밀하게 제어할 수 있게 된다.As the chill roll and the cooling belt directly contact and press the plating layer during the process of adjusting the coating weight and cooling the plating layer, the thickness of the steel sheet is gradually reduced along the moving direction of the steel sheet, so that the thickness of the steel sheet can be more precisely controlled. do.
또한, 칠롤과 냉각벨트에 의한 압력하에 도금층의 냉각이 진행되므로 용융 아연 도금뿐만 아니라 난도금성 강종의 도금성을 개선할 수 있다.In addition, since the cooling of the plating layer proceeds under pressure by the chill roll and the cooling belt, it is possible to improve the plating property of the non-galvanized steel as well as hot dip galvanizing.
도금 부착량 조절 과정과 도금층 냉각 과정에서 액체 질소가 기체화될 수 있으며, 이 과정에서 발생된 배출가스는 여과 과정을 거친 후 열처리로(Furnace) 내 환원가스 또는 도금 강판 냉각 공정의 분위기 유지용 가스로 재활용할 수 있다.Liquid nitrogen may be gasified in the process of adjusting the coating weight and cooling the plating layer, and the exhaust gas generated in this process may be reduced gas in the furnace or gas for maintaining the atmosphere of the plating steel plate cooling process after filtration. Can be recycled.
여기서, 상기 냉각벨트에 의한 강판의 도금층 냉각과정에서, 도금 강판의 도금층 표면에 패턴을 형성할 수 있다. Here, in the cooling process of the plated layer of the steel sheet by the cooling belt, a pattern may be formed on the surface of the plated layer of the plated steel sheet.
냉각벨트가 도금층을 가압하여 냉각하면서, 냉각벨트 표면에 형성된 패턴이 도금층을 눌러 가압하게 된다. 이에, 냉각벨트 표면에 형성된 패턴이 그대로 도금층에 전사되어 도금층 표면에 냉각벨트 표면에 형성된 패턴과 동일한 형태의 패턴이 형성된다.While the cooling belt presses and cools the plated layer, the pattern formed on the surface of the cooling belt presses the plated layer. Thus, the pattern formed on the surface of the cooling belt is transferred to the plating layer as it is, the same pattern as the pattern formed on the surface of the cooling belt is formed on the surface of the plating layer.
이와 같이, 간단히 도금층을 냉각하는 과정에서 도금강판 표면에 원하는 형태의 패턴을 형성할 수 있게 된다.As such, in the process of simply cooling the plating layer, a pattern having a desired shape may be formed on the surface of the plated steel sheet.
이상 설명한 바와 같이 본 발명의 예시적인 실시예가 도시되어 설명되었지만, 다양한 변형과 다른 실시예가 본 분야의 숙련된 기술자들에 의해 행해질 수 있을 것이다. 이러한 변형과 다른 실시예들은 첨부된 청구범위에 모두 고려되고 포함되어, 본 발명의 진정한 취지 및 범위를 벗어나지 않는다 할 것이다.While the exemplary embodiments of the invention have been illustrated and described as described above, various modifications and other embodiments may be made by those skilled in the art. Such modifications and other embodiments are all considered and included in the appended claims, without departing from the true spirit and scope of the invention.
Claims (20)
- 강판을 용융 도금하는 도금 욕조;Plating bath for hot-dip steel plate;상기 강판 진행방향을 따라 상기 도금 욕조 후단에서 강판의 일면 또는 양면에 배치되어 강판의 도금 부착량을 제어하는 와이핑부; 및A wiping part disposed on one side or both sides of the steel plate at the rear end of the plating bath along the advancing direction of the steel plate to control the plating adhesion amount of the steel plate; And상기 강판 진행방향을 따라 상기 와이핑부 후단에서 강판의 일면 또는 양면에 배치되어 강판을 냉각시키기 위한 냉각부를 포함하고,A cooling unit for cooling the steel sheet is disposed on one side or both sides of the steel sheet at the rear end of the wiping portion along the steel plate traveling direction,상기 냉각부는 강판 표면의 도금층에 밀착하여 도금층을 냉각하는 적어도 하나 이상의 냉각체, 및 상기 냉각체로 액체 질소나 액체 헬륨을 포함하는 극저온 액체를 공급하여 냉각체를 냉각하는 냉매공급부를 포함하는 도금 장치. The cooling unit plating apparatus comprising at least one cooling body in close contact with the plating layer on the surface of the steel sheet to cool the plating layer, and a refrigerant supply unit for supplying cryogenic liquid containing liquid nitrogen or liquid helium to the cooling body to cool the cooling body.
- 제 1 항에 있어서, The method of claim 1,상기 와이핑부는 강판 표면의 도금층에 접촉하여 도금 부착량을 제어하는 나이프, 및 상기 나이프로 액체 질소나 액체 헬륨을 포함하는 극저온 액체를 공급하여 나이프를 냉각하는 냉매공급부를 포함하는 도금 장치.The wiping unit includes a knife for contacting the plated layer on the surface of the steel sheet to control the plating amount, and a refrigerant supply unit for supplying a cryogenic liquid containing liquid nitrogen or liquid helium to the knife to cool the knife.
- 제 2 항에 있어서,The method of claim 2,상기 와이핑부는 강판 진행방향을 따라 상기 나이프 후단에서 강판 폭방향으로 연장되고 내부에는 극저온 액체가 순환되며, 강판 표면의 도금층에 밀착하여 도금 부착량을 제어하고 강판을 급냉시키는 칠롤을 더 포함하는 도금 장치.The wiping part further includes a chill roll extending from the rear end of the knife in the steel plate width direction along the steel plate traveling direction, and having a cryogenic liquid circulated therein, in close contact with the plating layer on the surface of the steel plate, to control the coating amount and to quench the steel plate. .
- 강판을 용융 도금하는 도금 욕조;Plating bath for hot-dip steel plate;상기 강판 진행방향을 따라 상기 도금 욕조 후단에서 강판의 일면 또는 양면에 배치되어 강판의 도금 부착량을 제어하는 와이핑부; 및A wiping part disposed on one side or both sides of the steel plate at the rear end of the plating bath along the advancing direction of the steel plate to control the plating adhesion amount of the steel plate; And상기 강판 진행방향을 따라 상기 와이핑부 후단에서 강판의 일면 또는 양면에 배치되어 강판을 냉각시키기 위한 냉각부를 포함하고,A cooling unit for cooling the steel sheet is disposed on one side or both sides of the steel sheet at the rear end of the wiping portion along the steel plate traveling direction,상기 와이핑부는 강판 표면의 도금층에 접촉하여 도금 부착량을 제어하는 나이프, 및 상기 나이프로 액체 질소나 액체 헬륨을 포함하는 극저온 액체를 공급하여 나이프를 냉각하는 냉매공급부를 포함하는 도금 장치.The wiping unit includes a knife for contacting the plated layer on the surface of the steel sheet to control the plating amount, and a refrigerant supply unit for supplying a cryogenic liquid containing liquid nitrogen or liquid helium to the knife to cool the knife.
- 제 4 항에 있어서,The method of claim 4, wherein상기 와이핑부는 강판 진행방향을 따라 상기 나이프 후단에서 강판 폭방향으로 연장되고 내부에는 극저온 액체가 순환되며, 강판 표면의 도금층에 밀착하여 도금 부착량을 제어하고 강판을 급냉시키는 칠롤을 더 포함하는 도금 장치.The wiping part further includes a chill roll extending from the rear end of the knife in the steel plate width direction along the steel plate traveling direction, and having a cryogenic liquid circulated therein, in close contact with the plating layer on the surface of the steel plate, to control the coating amount and to quench the steel plate. .
- 제 2 항 내지 제 5 항 중 어느 한 항에 있어서,The method according to any one of claims 2 to 5,상기 나이프는 강판 폭방향으로 연장되고 내부에는 극저온 액체가 순한되는 바디, 및 상기 바디 선단에 설치되고 강판의 도금층에 접촉하여 도금 부착량을 제어하는 팁부를 포함하는 도금 장치.The knife includes a body extending in the width direction of the steel sheet and the inside is a mild cryogenic liquid, and a tip portion provided at the tip of the body and in contact with the plating layer of the steel sheet to control the coating amount.
- 제 2 항 내지 제 5 항 중 어느 한 항에 있어서,The method according to any one of claims 2 to 5,상기 나이프는 강판 폭방향으로 연장되고 회전가능하게 설치되며 내부에는 극저온 액체가 순환되는 회전체와, 상기 회전체 외주면에 원주방향을 따라 간격을 두고 설치되고 강판 표면의 도금층에 접하여 도금 부착량을 제어하는 팁부, 및 상기 회전체에 연결되어 회전체를 회전시켜 일측 팁부를 강판 표면을 향하여 배치시키는 회전구동부를 포함하는 도금 장치.The knife extends in the width direction of the steel plate and is rotatably installed therein, and a rotating body in which cryogenic liquid is circulated therein, and is disposed at intervals along the circumferential direction on the outer circumferential surface of the rotating body and in contact with the plating layer on the surface of the steel plate to control the plating amount A plating apparatus comprising a tip portion, and a rotary driving portion connected to the rotating body to rotate the rotating body to place one tip portion toward the steel plate surface.
- 제 6 항에 있어서,The method of claim 6,상기 와이핑부는 상기 나이프에 구비되어 강판에 대한 팁부의 접촉 하중을 검출하는 로드센서, 및 상기 로드센서의 검출신호에 따라 강판에 대해 나이프를 이동하여 강판에 대한 팁부의 가압력을 제어하는 제어부를 더 포함하는 도금 장치.The wiping unit further includes a load sensor provided in the knife to detect a contact load of the tip portion with respect to the steel plate, and a control unit for controlling the pressing force against the steel sheet by moving the knife with respect to the steel plate according to the detection signal of the load sensor. Plating device comprising.
- 제 6 항에 있어서,The method of claim 6,상기 나이프는 팁부가 -250 내지 5℃의 온도로 냉각되는 도금 장치.The knife is a plating apparatus wherein the tip is cooled to a temperature of -250 to 5 ℃.
- 제 6 항에 있어서,The method of claim 6,상기 팁부는 강판에 폭방향에 대해 평행하게 배치된 구조의 도금 장치.And the tip portion is disposed on the steel sheet in parallel with the width direction.
- 제 6 항에 있어서,The method of claim 6,상기 팁부는 강판의 폭방향에 대해 경사지게 배치된 구조의 도금 장치.The tip portion plating apparatus having a structure arranged inclined with respect to the width direction of the steel sheet.
- 제 6 항에 있어서,The method of claim 6,상기 팁부는 꺽여져 형성되어, 강판의 이동방향을 따라 V 자 형태 또는 역V 자 형태로 배치된 구조의 도금 장치.The tip portion is formed by bending, the plating apparatus having a structure arranged in a V-shape or inverted V-shape along the moving direction of the steel sheet.
- 제 3 항 또는 제 5 항에 있어서,The method according to claim 3 or 5,상기 와이핑부는 상기 칠롤에 구비되어 강판에 대한 칠롤의 접촉 하중을 검출하는 로드센서, 및 상기 로드센서의 검출신호에 따라 강판에 대해 칠롤을 이동하여 강판에 대한 칠롤의 가압력을 제어하는 제어부를 더 포함하는 도금 장치.The wiping unit further includes a load sensor provided in the chill roll to detect a contact load of the chill roll with respect to the steel sheet, and a control unit for controlling the pressing force of the chill roll against the steel sheet by moving the chill roll with respect to the steel sheet according to the detection signal of the load sensor. Plating device comprising.
- 제 3 항 또는 제 5 항에 있어서,The method according to claim 3 or 5,상기 칠롤은 -250 내지 5℃의 온도로 냉각되는 도금 장치.The chill roll is a plating apparatus that is cooled to a temperature of -250 to 5 ℃.
- 제 3 항 또는 제 5 항에 있어서,The method according to claim 3 or 5,상기 칠롤 또는 냉각롤은 표면조도가 평균 0.1 내지 3um 인 도금 장치.The chill roll or the cooling roll has a surface roughness of 0.1 to 3um average plating device.
- 제 1 항 내지 제 3 항 중 어느 한 항에 있어서,The method according to any one of claims 1 to 3,상기 냉각체는 강판 폭방향으로 연장되고 내부에는 극저온 액체가 순환되며 강판 표면의 도금층에 가압되어 냉기를 가하는 냉각롤을 포함하고, 상기 냉각롤은 복수개가 강판의 진행방향을 따라 간격을 두고 배치된 구조의 도금 장치.The cooling body includes a cooling roll extending in the width direction of the steel sheet and having a cryogenic liquid circulated therein and pressurized by a plating layer on the surface of the steel sheet to apply cold air, and the plurality of cooling rolls are arranged at intervals along the advancing direction of the steel sheet. Plating device of structure.
- 제 16 항에 있어서,The method of claim 16,상기 냉각체는 적어도 두 개의 냉각롤 사이에 감겨져 설치되고 강판 표면의 도금층에 밀착하여 냉기를 가하는 냉각벨트를 더 포함하는 도금 장치.The cooling apparatus further comprises a cooling belt wound and installed between at least two cooling rolls and in close contact with the plating layer on the surface of the steel sheet to apply cold air.
- 제 17 항에 있어서,The method of claim 17,상기 냉각벨트는 -250 내지 5℃의 온도로 냉각되는 도금 장치.The cooling belt is a plating apparatus that is cooled to a temperature of -250 to 5 ℃.
- 제 17 항에 있어서,The method of claim 17,상기 냉각부는 상기 냉각롤에 구비되어 강판에 대한 냉각벨트의 접촉 하중을 검출하는 로드센서, 및 상기 로드센서의 검출신호에 따라 강판에 대해 냉각롤을 이동하여 강판에 대한 냉각벨트의 가압력을 제어하는 제어부를 더 포함하는 도금 장치.The cooling unit is provided on the cooling roll to control the pressing force of the cooling belt against the steel sheet by moving the cooling roll with respect to the steel sheet in accordance with the load sensor for detecting the contact load of the cooling belt to the steel sheet, and the detection signal of the load sensor Plating apparatus further comprising a control unit.
- 제 16 항에 있어서,The method of claim 16,상기 냉각벨트는 표면에 도금층으로 전사될 패턴이 형성된 도금 장치.The cooling belt is a plating apparatus having a pattern to be transferred to the plating layer on the surface.
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| JP2018533132A JP6667641B2 (en) | 2015-12-24 | 2016-12-23 | Plating apparatus and plating method |
| MX2018007843A MX2018007843A (en) | 2015-12-24 | 2016-12-23 | Plating device and plating method. |
| CN201680075453.8A CN108431284A (en) | 2015-12-24 | 2016-12-23 | Plater and coating method |
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| KR1020150186322A KR101711856B1 (en) | 2015-12-24 | 2015-12-24 | Continuous galvanizing apparatus and method |
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| JP7328542B2 (en) * | 2019-11-29 | 2023-08-17 | 日本製鉄株式会社 | Hot dip plated steel sheet |
| CN113463001B (en) * | 2021-07-01 | 2023-08-01 | 深圳市展鑫威科技有限公司 | Metal plating device applicable to steel belts with different thicknesses |
| CN113322427B (en) * | 2021-08-02 | 2021-10-29 | 天津市新宇彩板有限公司 | Method for controlling spangles on surface of steel plate by adopting aluminum-zinc-magnesium plating solution |
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| KR960000868Y1 (en) * | 1993-08-09 | 1996-02-02 | 포항종합제철 주식회사 | Cooling device of continuous hot-dipping tester |
| JPH09256131A (en) * | 1996-03-18 | 1997-09-30 | Kawasaki Steel Corp | Method for adjusting spangle of continuously hot dip galvanized steel strip |
| KR20000041285A (en) * | 1998-12-22 | 2000-07-15 | 이구택 | Method and apparatus for cooling alloyed molten galvanized steel sheet |
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| CN108431284A (en) | 2018-08-21 |
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| JP2018538448A (en) | 2018-12-27 |
| JP6667641B2 (en) | 2020-03-18 |
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