EP3686311B1 - Plate warp correction device for metal plates and continuous plating processing equipment for metal plates - Google Patents

Plate warp correction device for metal plates and continuous plating processing equipment for metal plates Download PDF

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Publication number
EP3686311B1
EP3686311B1 EP17933221.8A EP17933221A EP3686311B1 EP 3686311 B1 EP3686311 B1 EP 3686311B1 EP 17933221 A EP17933221 A EP 17933221A EP 3686311 B1 EP3686311 B1 EP 3686311B1
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EP
European Patent Office
Prior art keywords
roll
metal strip
warpage
correction
strip
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP17933221.8A
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German (de)
English (en)
French (fr)
Other versions
EP3686311A4 (en
EP3686311A1 (en
Inventor
Takashi Yonekura
Masao TAMBARA
Masashi Yoshikawa
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Primetals Technologies Japan Ltd
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Primetals Technologies Japan Ltd
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Publication of EP3686311A4 publication Critical patent/EP3686311A4/en
Publication of EP3686311A1 publication Critical patent/EP3686311A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D1/00—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling
    • B21D1/02—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling by rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D1/00—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling
    • B21D1/05—Stretching combined with rolling
    • 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
    • C23C2/003—Apparatus
    • C23C2/0034—Details related to elements immersed in bath
    • C23C2/00342—Moving elements, e.g. pumps or mixers
    • C23C2/00344—Means for moving substrates, e.g. immersed rollers or immersed bearings
    • 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
    • C23C2/003—Apparatus
    • C23C2/0035—Means for continuously moving substrate through, into or out of the bath
    • 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
    • C23C2/003—Apparatus
    • C23C2/0038—Apparatus characterised by the pre-treatment chambers located immediately upstream of the bath or occurring locally before the dipping process
    • 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
    • C23C2/003—Apparatus
    • C23C2/0038—Apparatus characterised by the pre-treatment chambers located immediately upstream of the bath or occurring locally before the dipping process
    • C23C2/004—Snouts
    • 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
    • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • C23C2/022—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating
    • 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
    • C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
    • C23C2/12—Aluminium or alloys based thereon
    • 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
    • C23C2/34—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
    • 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
    • C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
    • C23C2/06—Zinc or cadmium or alloys based thereon

Definitions

  • the present disclosure relates to a warpage correction apparatus for a metal strip and a continuous plating facility for a metal strip.
  • a metal plate in strip form is continuously plated with molten metal (hot dip coating)
  • Patent Documents 1 and 2 disclose a continuous hot dip coating apparatus provided with a roll disposed upstream of a plating bath for hot dip coating of a steel strip and configured to warp the steel strip in a direction opposite to crossbow warpage after passing through a sink roll in the plating bath.
  • Patent Document 2 discloses that the pressing amount of this roll (snubber roll) upstream of the plating bath with respect to the pass line direction of the steel strip is adjustable by translationally moving the axis of the roll, and the pressing amount is adjusted in accordance with the width of the steel strip, for instance.
  • JP H02 54746 A discloses a warpage correction device in a continuous plating facility with a fixed roll and a sink roll of approximately equal size.
  • JP H03 166354 A and JP 2007 238991 A disclose further warpage correction devices related to the one of the present invention.
  • the present inventors have intensively studied and consequently found that, when a correction roll for warping a metal strip in a direction opposite to crossbow warpage of the metal strip after passing through the sink roll is provided upstream of a molten metal pot (plating bath) as in Patent Documents 1 and 2, and in particular, when the metal strip is relatively thick (e.g., in the case of steel strip, the thickness is about 1.5 mm or more), warpage of the metal strip caused upstream of the correction roll may not be effectively corrected even by changing the apparent diameter (pressing amount) of the correction roll between minimum and maximum values.
  • an object of at least one embodiment of the present invention is to provide a warpage correction apparatus for a metal strip and a continuous plating facility for a metal strip whereby it is possible to effectively correct warpage of the metal strip in the strip width direction even when the metal strip is relatively thick.
  • the warpage correction apparatus according to the present invention is defined in independent claim 1. Further advantageous features are set out in the dependent claims.
  • a warpage correction apparatus for a metal strip and a continuous plating facility for a metal strip whereby it is possible to effectively correct warpage of the metal strip in the strip width direction even when the metal strip is relatively thick.
  • FIG. 1 is a schematic configuration diagram of a continuous plating facility according to an embodiment.
  • the continuous plating facility 100 is a facility for continuously plating a metal strip 2 (e.g., steel strip) and includes a furnace 3 for heat treatment of the metal strip 2, a pot 6 (molten metal pot) forming a plating bath 8, and a wiping nozzle 10 for adjusting the amount of a plating solution (molten metal) adhering to the metal strip 2.
  • a metal strip 2 e.g., steel strip
  • a furnace 3 for heat treatment of the metal strip 2
  • a pot 6 molten metal pot
  • a wiping nozzle 10 for adjusting the amount of a plating solution (molten metal) adhering to the metal strip 2.
  • the arrow in FIG. 1 represents the conveying direction (moving direction) of the metal strip 2.
  • the furnace 3 is a device for heat treatment of the metal strip 2 passing therethrough.
  • the furnace 3 may be configured to continuously anneal the metal strip 2.
  • the interior of the furnace 3 is provided with a plurality of rolls 14. These rolls 14 serve to apply tension to the metal strip 2 or change the direction of the metal strip 2 to convey the metal strip 2. This enables continuous treatment of the metal strip 2.
  • the interior of the furnace 3 may be provided with reducing or non-oxidizing gas.
  • An outlet portion 4 of the furnace 3 shown in FIG. 1 is provided with bridle rolls 16A, 16B for adjusting tension applied to the metal strip 2.
  • the temperature in the furnace 3 may vary with position.
  • the outlet portion 4 of the furnace 3 has a relatively low temperature, while a portion on the upstream side of the outlet portion 4 with respect to the conveying direction of the metal strip 2 (hereinafter, also simply referred to as "upstream side"), e.g., a portion in the vicinity of a burner, has a relatively high temperature.
  • upstream side a portion on the upstream side of the outlet portion 4 with respect to the conveying direction of the metal strip 2
  • the bridle rolls 16A, 16B may be configured to apply appropriate tension to the metal strip 2 in accordance with the temperature distribution in the furnace 3, for instance.
  • a snout 5 is provided which is a tubular member forming a passage for the metal strip 2.
  • An end portion of the snout 5 closer to the pot 6 is immersed in molten metal (plating bath 8) stored in the pot 6 to prevent leakage of gas from the inside to the outside of the furnace 3 or entrance of gas (e.g., air) from the outside to the inside of the furnace 3.
  • the pot 6 stores molten metal as the plating solution and forms a plating bath 8.
  • the molten metal stored in the pot 6 may be, but not limited to, zinc, aluminum, or an alloy containing them.
  • the pot 6 contains a sink roll 20.
  • the metal strip 2 introduced from the inside of the furnace 3 to the plating bath 8 through the snout 5 is directed upward by the sink roll 20, so that the metal strip 2 with the molten metal adhering thereto moves to the upper side of the pot 6.
  • the wiping nozzle 10 and a warpage measuring device 12 are provided on the downstream side of the sink roll 20 with respect to the conveying direction of the metal strip 2 (hereinafter, also simply referred to as "downstream side").
  • the wiping nozzle 10 may extend along the strip width direction of the metal strip 2 and include a slit opening to the pass line of the metal strip 2.
  • the wiping nozzle 10 is configured to jet a gas to the traveling metal strip 2, for example through the slit, to wipe and remove the molten metal excessively adhering to the metal strip 2 so as to make the thickness of the molten metal on the surface of the metal strip 2 uniform.
  • the warpage measuring device 12 is a device for measuring the warpage amount of the metal strip 2 at the installation position of the warpage measuring device 12.
  • the warpage measuring device 12 may be disposed upstream or downstream of the wiping nozzle 10.
  • the warpage measuring device 12 may include a plurality of position sensors arranged along the strip width direction of the metal strip 2 and each configured to measure a distance from the metal strip 2.
  • the warpage correction apparatus 1 may be configured to correct warpage of the strip based on a measurement result of the warpage measuring device 12.
  • At least some of the plurality of rolls 14 disposed in the furnace 3 are configured to change the conveying direction of the conveyed metal strip 2 during normal operation of the continuous plating facility 100.
  • the roll for changing the conveying direction of the metal strip 2 is generally configured so that the metal strip 2 is wound thereon. For instance, in case of a roll for changing the conveying direction of the metal strip 2 by 90 degrees or more, it can be visually confirmed that the metal strip is wound around the roll.
  • the metal strip 2 warps in the strip width direction (C-warp; crossbow).
  • the phrase “the metal strip 2 is wound around the roll 14" means that the bend diameter of the metal strip 2 coincides with the diameter of the roll 14, i.e., the metal strip 2 is in surface contact with the roll 14.
  • At least some of the plurality of rolls 14 are fixed rolls whose rotational axes are fixed during normal operation of the continuous plating facility 100.
  • FIG. 2 is a schematic diagram of the warpage correction apparatus 1 according to an embodiment.
  • FIG. 3 is a diagram for describing warpage amount w of the metal strip 2, which shows a cross-section of the metal strip 2 taken along a plane perpendicular to the conveying direction at a position of the wiping nozzle 10.
  • FIG. 2 is an enlarged partial view of the continuous plating facility 100 shown in FIG. 1 , but the furnace 3 and the snout 5 shown in FIG. 1 are not depicted in FIG. 2 for convenience of description.
  • the warpage correction apparatus 1 includes a sink roll 20 disposed downstream of the bridle roll 16B, which is a fixed roll for changing the conveying direction of the metal strip 2, and inside the pot 6, and a correction roll 18 disposed between the bridle roll 16B (fixed roll) and the sink roll 20.
  • the correction roll 18 is disposed above the plating bath 8.
  • the correction roll 18 may be disposed inside the snout 5 as shown in FIG. 1 .
  • the bridle roll 16B is the downstream one of the bridle rolls 16A, 16B disposed at the outlet portion 4 of the furnace 3.
  • the correction roll 18 is configured to be able to adjust the pressing amount d2 (see FIG. 2 ) toward the metal strip 2 (or toward the pass line of the metal strip 2) by moving the rotational axis 19 of the correction roll 18. As shown in FIGs. 1 and 2 , the correction roll 18 is disposed on the opposite side of the metal strip 2 from the bridle roll 16B (fixed roll) and the sink roll 20.
  • the correction roll 18 and the metal strip 2 when the pressing amount d2 is 0 are shown by the dotted line.
  • the metal strip 2 is not pressed to the correction roll 18, and has a linear shape between the bridle roll 16B and the sink roll 20.
  • the correction roll 18 has apparent diameter D2 corresponding to the pressing amount d2.
  • the apparent diameter D2 of the correction roll 18 is a value defined as twice the reciprocal of the curvature of the metal strip 2 around a contact portion between the metal strip 2 and the correction roll 18.
  • the apparent diameter D2 is affected by both geometrical conditions such as the correction roll, the fixed roll, the thickness and width of the metal strip, and mechanical properties such as Young's modulus, yield stress, and tension of the metal strip 2.
  • the apparent diameter D2 can be adjusted from the actual diameter of the correction roll 18 (in a state where the metal strip 2 is wound around the roll 18) to infinity (in a state where the pressing amount d2 is zero).
  • FIG. 8 is a diagram for describing an example of a method of calculating the apparent diameter D2.
  • a curvature radius is obtained, and twice the curvature radius is defined as the apparent diameter D2.
  • the curve of the metal strip 2 in the vertical plane can also be obtained based on continuous measurement on the height of the side surface of the metal strip 2 with respect to a certain horizontal line, or based on information processing of an image of the side surface of the metal strip 2.
  • the ratio D3/D1 of the diameter D3 of the sink roll to the diameter D1 of the bridle roll 16B (fixed roll) is not less than 1.5.
  • the diameter D1 of the bridle roll 16B (fixed roll), the apparent diameter D2 of the correction roll 18, and the diameter D3 of the sink roll 20 satisfy D1 ⁇ D2 ⁇ D3.
  • the strip may warp in the strip width direction (warp such that the widthwise central portion of the strip protrudes in the strip thickness direction with respect to both widthwise edges, as shown in FIG. 3 , i.e., C-warp).
  • the warpage amount w (see FIG. 3 ) of the metal strip 2 means a distance between both end points in the thickness direction of the metal strip 2 in the strip width direction.
  • the deformation direction of warpage in the strip width direction applied to the metal strip 2 by each roll is determined depending on a positional relationship between the roll and the metal strip 2.
  • warpage in the strip width direction applied to the metal strip 2 by the bridle roll 16B (fixed roll) and the sink roll 20 is warpage in which the central portion of the metal strip 2 protrudes toward the first surface 2a (i.e., in a direction shown in FIG. 3 ) in the strip thickness direction
  • warpage in the strip width direction applied to the metal strip 2 by the correction roll 18 is warpage in which the central portion of the metal strip 2 protrudes toward the second surface 2b (i.e., opposite to the direction shown in FIG. 3 ).
  • the distance between the wiping nozzle 10 and the metal strip 2 in the strip width direction is varied.
  • the removal amount of the molten metal (plating solution) by the wiping nozzle 10 becomes nonuniform in the strip width direction depending on the distance between the wiping nozzle 10 and the metal strip 2. For instance, as the wiping nozzle 10 is distant from the metal strip 2, the removal amount of the molten metal (plating solution) by the wiping nozzle 10 decreases, so that the plating thickness increases.
  • the wiping nozzle 10 is close to the metal strip 2, the removal amount of the molten metal (plating solution) by the wiping nozzle 10 increases, so that the plating thickness decreases.
  • the plating thickness is not uniform, the plating thickness increases for ensuring the plating at the thinnest portion, which leads to an increase in cost.
  • the plating thickness variation on the metal strip 2 may lead to uneven weldability (weld strength) at the time of welding the metal strip in a subsequent process, reducing the quality of a product of the metal strip 2.
  • the warpage correction apparatus 1 since the ratio D3/D1 of the diameter D3 of the sink roll 20 to the diameter D1 of the bridle roll 16B (fixed roll) is not less than 1.5, it is possible to effectively correct warpage in the strip width direction at the exit side of the sink roll 20, as described later with reference to FIGs. 4 to 7 .
  • FIGs. 4 and 5 are each a graph showing an example of a relationship between the diameter D3 of the sink roll 20 and the warpage amount w of the metal strip 2 at the exit side of the sink roll 20 of the warpage correction apparatus 1 according to an embodiment.
  • the hatched area represents a range of the warpage amount w when the thickness t of the metal strip 2 is 3.2 mm or 2.3 mm respectively, the diameter D1 of the bridle roll 16B (fixed roll) is 800 mm, and the apparent diameter D2 (or pressing amount d2) of the correction roll 18 is changed between 800 mm and 2000 mm.
  • FIGs. 6 and 7 are graphs showing an example of a relationship between the apparent diameter D2 of the correction roll 18 and the warpage amount w of the metal strip 2 at the exit side of the sink roll 20 of the warpage correction apparatus 1 according to Example and Comparative Example, respectively.
  • FIG. 6 is a graph when the diameter D1 of the bridle roll 16B (fixed roll) is 800mm, the diameter D3 of the sink roll 20 is 2000 mm, D3/D1 is 2.5 in the warpage correction apparatus 1 described above.
  • FIG. 7 is a graph when D1 is 800mm, D3 is 900 mm, D3/D1 is 1.1 in the warpage correction apparatus 1 described above.
  • "t" represents the thickness of the metal strip 2.
  • the warpage amount in the strip width direction at the exit side of the sink roll 20 can be reduced to about zero by adjusting the apparent diameter D2 of the correction roll 18 appropriately (i.e., by adjusting the pressing amount d2 of the correction roll 18 appropriately).
  • the thickness t is relatively thick, i.e., about 3 to 4 mm, the warpage amount in the strip width direction cannot be reduced to about zero even by adjusting the apparent diameter D2 of the correction roll 18.
  • the warpage amount in the strip width direction at the exit side of the sink roll 20 can be reduced to about zero in a relatively wide strip thickness range of 1.2 mm ⁇ t ⁇ 4.5 mm.
  • the thicker metal strip 2 can be corrected so that its warpage due to the sink roll 20 is reduced to zero by adjusting the apparent diameter D2 (or pressing amount d2) of the correction roll 18.
  • the warpage correction apparatus 1 is set so that the ratio D3/D1 of the diameter D3 of the sink roll 20 to the diameter D1 of the bridle roll 16B (fixed roll) is not less than 1.5.
  • the apparent diameter D2 (or pressing amount d2) of the correction roll 18 appropriately, even when the thickness t of the metal strip 2 is relatively thick, it is possible to effectively reduce the warpage amount w of the metal strip 2 in the strip width direction at the outlet of the pot 6, and it is possible to correct warpage of the metal strip 2.
  • the warpage correction apparatus 1 when the diameter D1 of the bridle roll 16B (fixed roll), the apparent diameter D2 of the correction roll 18, and the diameter D2 of the sink roll 20 satisfy D1 ⁇ D2 ⁇ D3, the plastic deformation amount provided to the metal strip 2 by each of the bridle roll 16B (fixed roll), the correction roll 18, and the sink roll 20 is the greatest in the sink roll 20, followed by the correction roll 18 and the bridle roll 16B (fixed roll). Accordingly, warpage of the metal strip 2 at the exit side of the sink roll 20 can be effectively corrected in an adjustment range of plastic deformation by the correction roll 18.
  • the warpage correction apparatus 1 may further include a controller (not shown) configured to adjust the pressing amount d2 of the correction roll 18 toward the metal strip 2 based on a measurement result of the warpage amount by the warpage measuring device 12.
  • the controller may be configured to adjust the pressing amount d2 of the correction roll 18 toward the metal strip 2 so that the warpage amount w approximates zero by feedback control based on the warpage amount w at the exit side of the sink roll 20 measured by the warpage measuring device 12.
  • the controller may be configured to calculate the warpage amount w of the metal strip 2 at the exit side of the sink roll 20 based on detection results of the position sensors, and adjust the pressing amount d2 of the correction roll 18 toward the metal strip 2 based on the warpage amount w thus calculated.
  • a warpage correction apparatus is a warpage correction apparatus for a metal strip to be used in a continuous plating facility for the metal strip comprising: a sink roll disposed downstream of a fixed roll with respect to a conveying direction of the metal strip and inside a molten metal pot for plating, the fixed roll being configured to change the conveying direction of the metal strip; and a correction roll disposed between the fixed roll and the sink roll and configured to correct warpage of the metal strip, wherein a ratio D3/D1 of a diameter D3 of the sink roll to a diameter D1 of the fixed roll is not less than 1.5.
  • the metal strip may warp in the strip width direction (hereinafter, referred to as "C-warp” or simply “warpage") at the exit side of each roll.
  • C-warp the strip width direction
  • the ratio D3/D1 of the diameter D3 of the sink roll to the diameter D1 of the fixed roll increases, it is possible to expand the adjustable range of warpage amount in the strip width direction at the exit side of the sink roll by adjusting the apparent diameter D2 of the correction roll, and it is possible to bring the warpage amount of a thicker metal strip close to zero.
  • the bearing of the correction roll requires a large clearance to prevent biting of foreign matter. In this case, backlash is likely to occur due to the clearance of the bearing, so that it is difficult to accurately correct warpage of the metal strip.
  • the correction roll is disposed between the fixed roll and the sink roll (i.e., upstream of the sink roll with respect to the conveying direction of the metal strip), it is unnecessary to dispose the correction roll inside the molten metal pot. Accordingly, a bearing with little backlash can be adopted, and the warpage amount of the metal strip can be accurately adjusted. Further, since the correction roll in the molten metal pot can be eliminated, a sink roll having a larger diameter can be adopted without increasing the size of the existing molten metal pot which assumes that the correction roll is disposed inside the pot.
  • the "fixed roll” in the above (1) may be a roll that mainly causes warpage of the metal strip at the exit side of the sink roll. More specifically, the "fixed roll” in the above (1) may be the bridle roll 16B of the warpage correction apparatus 1 or may be another roll 14 fixed in the furnace 3. Moreover, the “fixed roll” in the above (1) may be one disposed on the most downstream side of the fixed rolls for changing the conveying direction of the metal strip.
  • an expression of relative or absolute arrangement such as “in a direction”, “along a direction”, “parallel”, “orthogonal”, “centered”, “concentric” and “coaxial” shall not be construed as indicating only the arrangement in a strict literal sense, but also includes a state where the arrangement is relatively displaced by a tolerance, or by an angle or a distance whereby it is possible to achieve the same function.
  • an expression of an equal state such as “same” “equal” and “uniform” shall not be construed as indicating only the state in which the feature is strictly equal, but also includes a state in which there is a tolerance or a difference that can still achieve the same function.
  • an expression of a shape such as a rectangular shape or a cylindrical shape shall not be construed as only the geometrically strict shape, but also includes a shape with unevenness or chamfered corners within the range in which the same effect can be achieved.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Coating With Molten Metal (AREA)
  • Straightening Metal Sheet-Like Bodies (AREA)
EP17933221.8A 2017-11-30 2017-11-30 Plate warp correction device for metal plates and continuous plating processing equipment for metal plates Active EP3686311B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2017/043023 WO2019106785A1 (ja) 2017-11-30 2017-11-30 金属板の板反り矯正装置及び金属板の連続めっき処理設備

Publications (3)

Publication Number Publication Date
EP3686311A4 EP3686311A4 (en) 2020-07-29
EP3686311A1 EP3686311A1 (en) 2020-07-29
EP3686311B1 true EP3686311B1 (en) 2021-06-23

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EP17933221.8A Active EP3686311B1 (en) 2017-11-30 2017-11-30 Plate warp correction device for metal plates and continuous plating processing equipment for metal plates

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US (1) US20200261957A1 (ja)
EP (1) EP3686311B1 (ja)
JP (1) JP6381858B1 (ja)
CN (1) CN111295461A (ja)
WO (1) WO2019106785A1 (ja)

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Publication number Priority date Publication date Assignee Title
US11384419B2 (en) * 2019-08-30 2022-07-12 Micromaierials Llc Apparatus and methods for depositing molten metal onto a foil substrate
IT202000016012A1 (it) * 2020-07-02 2022-01-02 Danieli Off Mecc Apparato di correzione della planarità di un nastro metallico e relativo metodo di correzione

Family Cites Families (10)

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Publication number Priority date Publication date Assignee Title
JPS5511171A (en) * 1978-07-10 1980-01-25 Sumitomo Metal Ind Ltd Fused zinc one side plating apparatus of steel belt
JPS5554359U (ja) * 1978-10-04 1980-04-12
JPH0254746A (ja) 1988-08-18 1990-02-23 Kawasaki Steel Corp 帯状物の幅方向反り防止方法およびその装置
KR0174815B1 (ko) * 1989-09-18 1999-02-18 미다 가쓰시게 교정장치 및 교정방법
JPH03166354A (ja) 1989-11-24 1991-07-18 Kawasaki Steel Corp 鋼帯の連続溶融めっき装置
JP3111857B2 (ja) * 1995-07-06 2000-11-27 日本鋼管株式会社 溶融めっき鋼板の形状制御方法
JP2005097748A (ja) * 2001-03-15 2005-04-14 Jfe Steel Kk 溶融めっき金属帯の製造方法及び製造装置
JP2004107681A (ja) * 2002-09-13 2004-04-08 Jfe Steel Kk 溶融めっき金属帯の製造方法および製造装置
JP4912699B2 (ja) * 2006-03-07 2012-04-11 新日本製鐵株式会社 溶融めっき設備
WO2013121891A1 (ja) * 2012-02-13 2013-08-22 スチールプランテック株式会社 ローラレベラおよび板材の矯正方法

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Title
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Also Published As

Publication number Publication date
CN111295461A (zh) 2020-06-16
WO2019106785A1 (ja) 2019-06-06
EP3686311A4 (en) 2020-07-29
JPWO2019106785A1 (ja) 2019-12-12
US20200261957A1 (en) 2020-08-20
EP3686311A1 (en) 2020-07-29
JP6381858B1 (ja) 2018-08-29

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