CA2794925C - Device for coating metal strip and method therefor - Google Patents
Device for coating metal strip and method therefor Download PDFInfo
- Publication number
- CA2794925C CA2794925C CA2794925A CA2794925A CA2794925C CA 2794925 C CA2794925 C CA 2794925C CA 2794925 A CA2794925 A CA 2794925A CA 2794925 A CA2794925 A CA 2794925A CA 2794925 C CA2794925 C CA 2794925C
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- coating
- stripping
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- 239000011248 coating agent Substances 0.000 title claims abstract description 62
- 238000000576 coating method Methods 0.000 title claims abstract description 62
- 239000002184 metal Substances 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title claims abstract description 14
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 33
- 239000000463 material Substances 0.000 claims abstract description 22
- 239000007788 liquid Substances 0.000 claims abstract description 13
- 238000010438 heat treatment Methods 0.000 claims description 30
- 238000001816 cooling Methods 0.000 claims description 14
- 230000001939 inductive effect Effects 0.000 claims description 5
- 238000011105 stabilization Methods 0.000 description 22
- 230000006641 stabilisation Effects 0.000 description 21
- 230000000694 effects Effects 0.000 description 9
- 238000003618 dip coating Methods 0.000 description 6
- 238000010276 construction Methods 0.000 description 4
- 238000005246 galvanizing Methods 0.000 description 4
- 238000005244 galvannealing Methods 0.000 description 4
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000013178 mathematical model Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000000137 annealing Methods 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 229910001338 liquidmetal Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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
- 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
- C23C2/34—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
- C23C2/02—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
- C23C2/50—Controlling or regulating the coating processes
- C23C2/52—Controlling or regulating the coating processes with means for measuring or sensing
- C23C2/524—Position of the substrate
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Coating With Molten Metal (AREA)
- Coating Apparatus (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention relates to a device for coating a metal strip (1) with a coating material, comprising a coating container (2) filled with a liquid coating material, through which or out of which the coated strip (1) is guided vertically (V) upward, wherein a stripping nozzle (3) for stripping still liquid coating material from the strip surface is arranged above the coating container (2), wherein an electromagnetic apparatus (4) for stabilizing the position of the strip (1) in a central position (5) is arranged above the stripping nozzle (3), wherein the apparatus (4) comprises two magnets (6) arranged on both sides of the metal strip (1) at the same height. In order to be able to respond in an improved and simplified manner to different requirements with respect to the strip guidance, the invention is characterized by means (7) for adjusting the vertical distance (H) of the magnets (6) from the stripping nozzle (3). The invention further relates to a method for coating a metal strip.
Description
Device for Coating Metal Strip and Method Therefor The invention relates to a device for coating a metal strip with a coating material. The device includes a coating container filled with a liquid coating material, wherein the coated strip is conducted vertically upwardly through or out of the coating container, wherein a stripping nozzle for stripping off any coating material from the strip surface which is still liquid, wherein above the stripping nozzle is arranged an electromagnetic device for stabilizing the position of the strip in a center position, wherein the device includes at least two magnets arranged on both sides of the metal strip on the same level. The invention further relates to a method for coating a metal strip with a coating material.
Document DE 10 2007 045202 Al discloses a device for the strip edge stabilization of a strip which includes at least one sensor for recognizing the position of the at least one strip edge, and at least one device for adjusting the strip edge position in which, in dependence on the strip edge position, a means for strip edge stabilization can be positioned transversely of the strip.
Devices for stabilizing the travel of a metal strip are also known from publications DE 10 2006 052000 Al and DE 10 2005 060058 Al. A strip stabilization device is provided for adjusting and stabilizing the distance of the strip in the transverse direction between the blow nozzles.
A device of this type and a corresponding method are known.
DE 10 2008 039 244 Al shows a device for hot dip coating in which the metal strip is conducted through the coating bath and is vertically upwardly conducted out of the bath. Above the coating container a stripping nozzle is arranged by means of which the excess coating material is blown from the strip surface. Above the stripping nozzle a strip stabilization unit is arranged at a defined distance, by means of which the strip is supposed to be held centrally in the middle plane of the plant.
Document DE 10 2007 045202 Al discloses a device for the strip edge stabilization of a strip which includes at least one sensor for recognizing the position of the at least one strip edge, and at least one device for adjusting the strip edge position in which, in dependence on the strip edge position, a means for strip edge stabilization can be positioned transversely of the strip.
Devices for stabilizing the travel of a metal strip are also known from publications DE 10 2006 052000 Al and DE 10 2005 060058 Al. A strip stabilization device is provided for adjusting and stabilizing the distance of the strip in the transverse direction between the blow nozzles.
A device of this type and a corresponding method are known.
DE 10 2008 039 244 Al shows a device for hot dip coating in which the metal strip is conducted through the coating bath and is vertically upwardly conducted out of the bath. Above the coating container a stripping nozzle is arranged by means of which the excess coating material is blown from the strip surface. Above the stripping nozzle a strip stabilization unit is arranged at a defined distance, by means of which the strip is supposed to be held centrally in the middle plane of the plant.
A similar solution is known from WO 02/14574 Al. In addition, details concerning the hot dip coating method are shown in WO 01/11101 Al, EP 0 659 897 Bl, EP 0 854 940 31 and JP 1100 6046.
In hot dip coating plants, particularly in hot galvanizing plants, different requirements are made with respect to strip position and strip travel. Particularly in the area of the stripping nozzles the strip vibrations are to be reduced and the strip shape is to be influenced by systems which operate without contact, the so-called electromagnetic strip stabilization systems.
In plants with a downstream inductive heating system (galvannealer) additional guide rollers are arranged above the stripping nozzle in front of the heating device, to ensure a quiet strip travel between the heating coils and to avoid defects to the plant and on the strip by contact of the strip therewith.
In hot dip coating plants, particularly in hot galvanizing plants, different requirements are made with respect to strip position and strip travel. Particularly in the area of the stripping nozzles the strip vibrations are to be reduced and the strip shape is to be influenced by systems which operate without contact, the so-called electromagnetic strip stabilization systems.
In plants with a downstream inductive heating system (galvannealer) additional guide rollers are arranged above the stripping nozzle in front of the heating device, to ensure a quiet strip travel between the heating coils and to avoid defects to the plant and on the strip by contact of the strip therewith.
Also, a stable concentric strip travel in plants with and without subsequently arranged heating inductors is of great importance for the strip cooling devices downstream of the stripping nozzle in order to achieve a uniform cooling effect. It is also here desired to avoid damage to the plant and the strip surface.
Various systems have become known which exert tensile forces on the steel strip without contact, namely electromagnetically, in order to minimize strip movements in the form of vibrations. Moreover, with these systems the strip shape can be influenced transversely of the transport direction.
The strip position perpendicular to the strip surface is measured in the strip stabilization system by means of distance sensors, and is regulated in a closed control loop.
At the same time, additional measuring devices can be used within the subsequent devices as additional signals for the strip position regulation.
Various systems have become known which exert tensile forces on the steel strip without contact, namely electromagnetically, in order to minimize strip movements in the form of vibrations. Moreover, with these systems the strip shape can be influenced transversely of the transport direction.
The strip position perpendicular to the strip surface is measured in the strip stabilization system by means of distance sensors, and is regulated in a closed control loop.
At the same time, additional measuring devices can be used within the subsequent devices as additional signals for the strip position regulation.
,......
, The following has been found to be disadvantageous: The position of the strip stabilizing unit is defined by the type of construction and focuses, in the previously known solutions for the most part, on a spatial vicinity to the stripping nozzle. Consequently, depending on the conception there is a distance of the strip stabilization magnets from the nozzle lip of the stripping nozzle (air discharge from the nozzle).
As a result, the distance to the subsequently arranged devices, such as for example, the heating inductors or to the subsequently arranged strip cooling unit, is very large.
This means that the strip stabilizing magnets have no effect or only a minimal effect on the strip movement at that location and consequently, no possibility of influencing the strip stability in the area spaced apart from the stripping nozzle.
However, if the strip stabilizing magnets are mounted directly in front of the heating inductor or the strip cooling unit, a respectively significantly reduced effect on the centering of the strip in the area of the stripping nozzle takes place.
Therefore, in the previously known plants always only one selected position occurs which usually is adapted to the effect in the area of the stripping nozzle, i.e. the strip stabilizing magnets are usually arranged in the area of the stripping nozzle.
However, the requirements made of a modern strip galvanizing plant cannot be met or can only be met to a limited extent by the known plants.
In view of these disadvantages, the invention is based on the object to further develop a device for coating a metal strip with a coating material as well as to further develop a corresponding method in such a way that it is possible to react to the different requirements of the strip guidance unit in a better and less complicated manner. Consequently, the quality of the hot dip coating, particularly the hot galvanizing, can be increased.
In accordance with the invention, this object is met with respect to the device by means for adjusting the vertical distance of the magnets from the stripping nozzle.
These means for adjusting the vertical distance may include at least one lifting element which is connected directly or indirectly to the stripping nozzle. In this case, the stripping nozzle may have, or may be connected to, a frame structure on which the at least one lifting element is arranged.
A heating element for heating the strip may be arranged above the stripping nozzle in order to be able to carry out a so-called galvannealing process. In this regard, the heating element is preferably constructed as an inductive ,......
, , , element. In this case, the means for adjusting the vertical position are preferably constructed for adjusting the vertical distance of the magnets in the entire area of the vertical extension between the stripping nozzle and the heating element.
In addition, a cooling section can be arranged above the heating element. A holding furnace can be arranged between the heating element and the cooling section.
The means for adjusting the vertical distance may include at least one hydraulic or pneumatic actuator; they can also include at least one mechanical actuator, particularly a spindle/nut system.
The method for coating a metal strip with a coating material in which the strip is guided through liquid coating material which is present in a coating container and is then vertically upwardly conducted out of the coating container, wherein above the coating container any coating material ,......
, , which is still liquid is stripped from the strip surface by a stripping nozzle, and wherein above the stripping nozzle the strip is stabilized by means of an electromagnetic device for stabilizing the position of the strip in a concentric position, wherein the device includes two magnets arranged on both sides of the strip on the same level, is characterized according to the invention in that the vertical distance of the magnets from the stripping nozzle is adjusted to a predetermined value, wherein, for adjusting the distance, means for adjusting the vertical distance from the stripping nozzle are actuated by a control.
The magnets are preferably always held concentrically in the middle position when the vertical distance is adjusted.
Accordingly, at the core of the invention is the fact that the position of the strip stabilizing magnets is not stationary, but can be adapted to the respective requirements by means of a suitable lifting device. In this regard, the aligned (centered) and optimized position of the strip stabilizing magnets relative to the traveling steel ,......
strip - in a direction perpendicular to the strip - is always maintained by a mechanical coupling of the strip stabilizing magnets with the stripping nozzle.
Based on physical considerations, it can be concluded that the strip stabilizing system must be positioned as closely as possible to the respective device or operating location to achieve an optimum function and, thus, to reduce the strip movements (Principle of St. Vernant). For example, for an optimization of the coating with liquid metal this is a position as close as possible to the stripping nozzles, wherein, for a concentric and quiet strip travel within the reheating device, the position of the contactless strip stabilization should be selected as closely as possible near this device. Consequently, it is useful to be able to reach both positions (once near the stripping nozzle and once near the heating device) by means of a suitable auxiliary device without the loss of the stabilizing functions. Moreover, additional positions can be reached which facilitate influencing both plant portions (stripping nozzle and heating device) with the strip stabilization.
,......
, , In accordance with the invention, the vertical position of the strip stabilizing magnets, which are a component of a strip stabilizing unit, can be adjusted flexibly to a desired value by a lifting device. This takes place in dependence on the state of operation or the desired contactless influence on the strip position. Positioning takes place preferably between the stripping nozzle and the heating inductors, arranged downstream in the conveying direction of the strip, for the galvannealing operation or a subsequently arranged strip cooling operation.
The actuating means for the vertical adjustment of the magnets remain always centered relative to the stripping nozzle because they are mechanically coupled therewith.
Accordingly, the invention makes possible a changeable position in a targeted manner of the strip stabilizing magnets above the stripping nozzle in a hot annealing plant.
Thus, the vertical adjustment possibility of the strip stabilizing magnets relative to the stripping nozzle permits any position for obtaining an optimized manner of operation between the extreme locations directly at the stripping nozzle and directly in front of the subsequently arranged heating elements, or prior to strip cooling.
In combined applications in which the strip position influences in the stripping nozzle as well as in the subsequently arranged devices are important, the effects on the respective devices are determined by means of a mathematical model taking into consideration the tension distribution in the strip; in the same manner, a vertical position of the strip stabilizing magnets, which is optimal for the case of application, is adjusted.
Accordingly, in one aspect the present invention resides in a method for coating a metal strip with a coating material, wherein the strip is guided through liquid coating material contained in the coating container and is then vertically upwardly conducted out of the coating container, wherein above the coating container any coating material which is still liquid is stripped of the strip surface by a stripping nozzle, and wherein above the stripping nozzle the strip is stabilized by means of an electromagnetic device for stabilizing the position of the strip in a center position, wherein the device includes at least two magnets arranged on both sides of the strip on the same level, and wherein the vertical distance (H) of the magnets from the stripping nozzle is adjusted by adjustment means in accordance with a predetermined value, and wherein the adjustment means are actuated by a control.
BRIEF DESCRIPTION OF THE DRAWING
In the drawing, embodiments of the invention are illustrated.
In the drawing:
12a Fig. 1 schematically shows a hot dip coating plant according to a first embodiment of the invention, Fig. 2 shows an alternative embodiment of the invention similar to Fig. 1, Fig. 3 is a perspective illustration of a holding frame for the stripping nozzle on which magnets for strip stabilization are arranged so as to be vertically adjustable, and Fig. 4 is a perspective illustration of the magnets for strip stabilization, arranged in a vertical adjusting device.
Fig. 1 is a sketch of a hot dip coating plant which serves for coating a strip 1 with a coating metal. In the embodiment, the strip 1 is introduced in the conventional manner into a coating container 2 which contains liquid coating material. In this embodiment, a deflection of the strip 1 into the vertical direction V is achieved by means of a deflection roller 14. Of course, the CVGL method can also be used in the same manner in which the strip 1 enters the coating container 2 vertically from below and the bottom opening is sealed by means of an electromagnetic closure.
After the coated strip 1 has left the coating container 2 vertically upwardly, any excess coating metal is blown away by a stripping nozzle 3. A device 4 for stabilizing the strip 1 is provided above the stripping nozzle 3. This device 4 has as its core two electromagnets 6 arranged on both sides of the strip 1. This makes it possible to subject the strip to magnetic forces in a targeted manner such that it is held in a symmetrical center position 5 of the device.
It is essential that means 7 are provided by means of which the vertical distance H of the magnets 6 from the stripping nozzle 3 can be adjusted in a targeted manner. This is illustrated in Fig. 1 by the double arrows next to the magnets 6 and by the fact that the magnets 6 are sketched once (in a middle position) with solid lines and two further alternative positions with broken lines, namely in a lower position adjacent the stripping nozzle 3 and, in an upper position at the upper end of the travel movement which can be carried out with the means 7.
The distance of the magnets 6 from the upper end of the stripping nozzle 3 is denoted by H and indicates to what extent the magnets 6 have been raised by the means 7.
A cooling section 11 for the strip 1 is provided above the stabilizing device 4 in Fig. 1. Above the cooling section 11, the strip 1 is deflected into the horizontal by a deflection roller 13.
In Fig. 2, an alternative solution is sketched, wherein in this case, compared to Fig. 1, an additional inductive heating device 10 is provided above the strip stabilization 4 by means of which a galvannealing process can be carried ,......
out in the manner which is known per se. In this case, a holding furnace 12 is provided between the heating device 10 and the cooling section 11.
Fig. 3 provides an idea of the construction of the proposed device. It can be seen that the stripping nozzle 3 is arranged at a frame structure 9 on which four elements 8 are fastened by means of which the magnets 6 can be raised or lowered relative to the stripping nozzle 3.
Further details of the structural configuration can be found in Fig. 4. As can be seen in this case, four lifting elements 8 - in the present embodiment constructed as mechanical actuators in the form of spindle/nut systems -are used for moving and adjusting the magnets 6 in the vertical direction V. The stripping nozzles 3 are not illustrated here; they can be found in the lower portion of the illustration according to Fig. 4.
When strip length changes occur, which lead to a readjustment of the stripping nozzle, the position of the strip stabilization is also changed due to the mechanical coupling of the strip stabilizing magnets.
The infinitely variable vertical adjustment of the magnets 6 of the strip stabilization facilitates the following procedure:
For the optimum galvannealing operation (GA operation), the strip stabilizing unit 4, and especially the magnets 6, are positioned by the means 7 (lifting device) directly underneath the inductive heating elements 10. Since the coating thickness for GA products is very thin (maximum 90g/m2) and, therefore, only small improvements in the coating structure can be achieved through the effect of strip stabilization, the main focus of the stabilizing effect concerns the strip travel in the heating element 10 (GA inductor) and, thus, the quality of the GA coating.
Because of the mechanical coupling with the stripping nozzle 3, the stripping nozzle 3 and the magnets 6 of the strip stabilizing unit are always centered relative to the strip 1.
The effect of the strip stabilization into the area of the stripping nozzle 3 is reduced in this case, but is not lost because of the optimal position computation through a mathematical model as it is used in this case. The magnets 6 are positioned more closely adjacent the heating elements (GA inductors) than at the stripping nozzle 3, but with the consideration of the physical effect in both directions.
In other coating products, the focus of the stabilization effect is to minimize the strip movement within the stripping nozzle 3. For this purpose, the position of the magnets 6 of the strip stabilization is selected to be in the area of the stripping nozzle 3.
The guide rollers in front of the heating element, which are used in the previously known plants for stabilizing the strip, are no longer required because it is now possible to . -influence the stabilizing effect in a targeted manner over the entire vertical range between the stripping nozzle and the heating element.
The means 7 (lifting device) also facilitate in an advantageous manner a manual cleaning of the stripping nozzle 3 during operation. The strip stabilizing unit or the magnets 6 are moved into a raised position without losing the stabilizing effect. In previously known systems, this is not possible. This gives the maintenance personnel free access to the stripping nozzle 3 and, thus, can manually clean the nozzle lips. This requirement is available in any hot galvanizing plant.
Positioning of the magnets 6 of the strip stabilization takes place, as explained above, with a device which may include two guides, supports and appropriate clamping devices which cause tensioning of the system and, thus, the parallel alignment of the strip stabilization (of the magnets 6) relative to the strip or to the stripping nozzle carrier system. This device for changing the strip . -stabilization position is fixedly mounted on the stripping nozzle 3, which contains a frame structure with adjusting elements for alignment.
Consequently, the invention in principle is a frame construction which, in turn, is fixedly connected to the basic frame construction of the stripping nozzle 3. This means that with the alignment of the stripping nozzle 3 relative to the strip 1, a synchronous alignment of the magnets 6 of the strip stabilization unit relative to the strip 1 always takes place.
List of Reference Numerals 1 Strip 2 Coating container 3 Stripping nozzle 4 Device for stabilizing Center position 6 Magnet 7 Means for adjusting the vertical position 8 Lifting element 9 Frame structure Heating element 11 Cooling section 12 Holding furnace 13 Deflection roller 14 Deflection roller V Vertical direction Distance
, The following has been found to be disadvantageous: The position of the strip stabilizing unit is defined by the type of construction and focuses, in the previously known solutions for the most part, on a spatial vicinity to the stripping nozzle. Consequently, depending on the conception there is a distance of the strip stabilization magnets from the nozzle lip of the stripping nozzle (air discharge from the nozzle).
As a result, the distance to the subsequently arranged devices, such as for example, the heating inductors or to the subsequently arranged strip cooling unit, is very large.
This means that the strip stabilizing magnets have no effect or only a minimal effect on the strip movement at that location and consequently, no possibility of influencing the strip stability in the area spaced apart from the stripping nozzle.
However, if the strip stabilizing magnets are mounted directly in front of the heating inductor or the strip cooling unit, a respectively significantly reduced effect on the centering of the strip in the area of the stripping nozzle takes place.
Therefore, in the previously known plants always only one selected position occurs which usually is adapted to the effect in the area of the stripping nozzle, i.e. the strip stabilizing magnets are usually arranged in the area of the stripping nozzle.
However, the requirements made of a modern strip galvanizing plant cannot be met or can only be met to a limited extent by the known plants.
In view of these disadvantages, the invention is based on the object to further develop a device for coating a metal strip with a coating material as well as to further develop a corresponding method in such a way that it is possible to react to the different requirements of the strip guidance unit in a better and less complicated manner. Consequently, the quality of the hot dip coating, particularly the hot galvanizing, can be increased.
In accordance with the invention, this object is met with respect to the device by means for adjusting the vertical distance of the magnets from the stripping nozzle.
These means for adjusting the vertical distance may include at least one lifting element which is connected directly or indirectly to the stripping nozzle. In this case, the stripping nozzle may have, or may be connected to, a frame structure on which the at least one lifting element is arranged.
A heating element for heating the strip may be arranged above the stripping nozzle in order to be able to carry out a so-called galvannealing process. In this regard, the heating element is preferably constructed as an inductive ,......
, , , element. In this case, the means for adjusting the vertical position are preferably constructed for adjusting the vertical distance of the magnets in the entire area of the vertical extension between the stripping nozzle and the heating element.
In addition, a cooling section can be arranged above the heating element. A holding furnace can be arranged between the heating element and the cooling section.
The means for adjusting the vertical distance may include at least one hydraulic or pneumatic actuator; they can also include at least one mechanical actuator, particularly a spindle/nut system.
The method for coating a metal strip with a coating material in which the strip is guided through liquid coating material which is present in a coating container and is then vertically upwardly conducted out of the coating container, wherein above the coating container any coating material ,......
, , which is still liquid is stripped from the strip surface by a stripping nozzle, and wherein above the stripping nozzle the strip is stabilized by means of an electromagnetic device for stabilizing the position of the strip in a concentric position, wherein the device includes two magnets arranged on both sides of the strip on the same level, is characterized according to the invention in that the vertical distance of the magnets from the stripping nozzle is adjusted to a predetermined value, wherein, for adjusting the distance, means for adjusting the vertical distance from the stripping nozzle are actuated by a control.
The magnets are preferably always held concentrically in the middle position when the vertical distance is adjusted.
Accordingly, at the core of the invention is the fact that the position of the strip stabilizing magnets is not stationary, but can be adapted to the respective requirements by means of a suitable lifting device. In this regard, the aligned (centered) and optimized position of the strip stabilizing magnets relative to the traveling steel ,......
strip - in a direction perpendicular to the strip - is always maintained by a mechanical coupling of the strip stabilizing magnets with the stripping nozzle.
Based on physical considerations, it can be concluded that the strip stabilizing system must be positioned as closely as possible to the respective device or operating location to achieve an optimum function and, thus, to reduce the strip movements (Principle of St. Vernant). For example, for an optimization of the coating with liquid metal this is a position as close as possible to the stripping nozzles, wherein, for a concentric and quiet strip travel within the reheating device, the position of the contactless strip stabilization should be selected as closely as possible near this device. Consequently, it is useful to be able to reach both positions (once near the stripping nozzle and once near the heating device) by means of a suitable auxiliary device without the loss of the stabilizing functions. Moreover, additional positions can be reached which facilitate influencing both plant portions (stripping nozzle and heating device) with the strip stabilization.
,......
, , In accordance with the invention, the vertical position of the strip stabilizing magnets, which are a component of a strip stabilizing unit, can be adjusted flexibly to a desired value by a lifting device. This takes place in dependence on the state of operation or the desired contactless influence on the strip position. Positioning takes place preferably between the stripping nozzle and the heating inductors, arranged downstream in the conveying direction of the strip, for the galvannealing operation or a subsequently arranged strip cooling operation.
The actuating means for the vertical adjustment of the magnets remain always centered relative to the stripping nozzle because they are mechanically coupled therewith.
Accordingly, the invention makes possible a changeable position in a targeted manner of the strip stabilizing magnets above the stripping nozzle in a hot annealing plant.
Thus, the vertical adjustment possibility of the strip stabilizing magnets relative to the stripping nozzle permits any position for obtaining an optimized manner of operation between the extreme locations directly at the stripping nozzle and directly in front of the subsequently arranged heating elements, or prior to strip cooling.
In combined applications in which the strip position influences in the stripping nozzle as well as in the subsequently arranged devices are important, the effects on the respective devices are determined by means of a mathematical model taking into consideration the tension distribution in the strip; in the same manner, a vertical position of the strip stabilizing magnets, which is optimal for the case of application, is adjusted.
Accordingly, in one aspect the present invention resides in a method for coating a metal strip with a coating material, wherein the strip is guided through liquid coating material contained in the coating container and is then vertically upwardly conducted out of the coating container, wherein above the coating container any coating material which is still liquid is stripped of the strip surface by a stripping nozzle, and wherein above the stripping nozzle the strip is stabilized by means of an electromagnetic device for stabilizing the position of the strip in a center position, wherein the device includes at least two magnets arranged on both sides of the strip on the same level, and wherein the vertical distance (H) of the magnets from the stripping nozzle is adjusted by adjustment means in accordance with a predetermined value, and wherein the adjustment means are actuated by a control.
BRIEF DESCRIPTION OF THE DRAWING
In the drawing, embodiments of the invention are illustrated.
In the drawing:
12a Fig. 1 schematically shows a hot dip coating plant according to a first embodiment of the invention, Fig. 2 shows an alternative embodiment of the invention similar to Fig. 1, Fig. 3 is a perspective illustration of a holding frame for the stripping nozzle on which magnets for strip stabilization are arranged so as to be vertically adjustable, and Fig. 4 is a perspective illustration of the magnets for strip stabilization, arranged in a vertical adjusting device.
Fig. 1 is a sketch of a hot dip coating plant which serves for coating a strip 1 with a coating metal. In the embodiment, the strip 1 is introduced in the conventional manner into a coating container 2 which contains liquid coating material. In this embodiment, a deflection of the strip 1 into the vertical direction V is achieved by means of a deflection roller 14. Of course, the CVGL method can also be used in the same manner in which the strip 1 enters the coating container 2 vertically from below and the bottom opening is sealed by means of an electromagnetic closure.
After the coated strip 1 has left the coating container 2 vertically upwardly, any excess coating metal is blown away by a stripping nozzle 3. A device 4 for stabilizing the strip 1 is provided above the stripping nozzle 3. This device 4 has as its core two electromagnets 6 arranged on both sides of the strip 1. This makes it possible to subject the strip to magnetic forces in a targeted manner such that it is held in a symmetrical center position 5 of the device.
It is essential that means 7 are provided by means of which the vertical distance H of the magnets 6 from the stripping nozzle 3 can be adjusted in a targeted manner. This is illustrated in Fig. 1 by the double arrows next to the magnets 6 and by the fact that the magnets 6 are sketched once (in a middle position) with solid lines and two further alternative positions with broken lines, namely in a lower position adjacent the stripping nozzle 3 and, in an upper position at the upper end of the travel movement which can be carried out with the means 7.
The distance of the magnets 6 from the upper end of the stripping nozzle 3 is denoted by H and indicates to what extent the magnets 6 have been raised by the means 7.
A cooling section 11 for the strip 1 is provided above the stabilizing device 4 in Fig. 1. Above the cooling section 11, the strip 1 is deflected into the horizontal by a deflection roller 13.
In Fig. 2, an alternative solution is sketched, wherein in this case, compared to Fig. 1, an additional inductive heating device 10 is provided above the strip stabilization 4 by means of which a galvannealing process can be carried ,......
out in the manner which is known per se. In this case, a holding furnace 12 is provided between the heating device 10 and the cooling section 11.
Fig. 3 provides an idea of the construction of the proposed device. It can be seen that the stripping nozzle 3 is arranged at a frame structure 9 on which four elements 8 are fastened by means of which the magnets 6 can be raised or lowered relative to the stripping nozzle 3.
Further details of the structural configuration can be found in Fig. 4. As can be seen in this case, four lifting elements 8 - in the present embodiment constructed as mechanical actuators in the form of spindle/nut systems -are used for moving and adjusting the magnets 6 in the vertical direction V. The stripping nozzles 3 are not illustrated here; they can be found in the lower portion of the illustration according to Fig. 4.
When strip length changes occur, which lead to a readjustment of the stripping nozzle, the position of the strip stabilization is also changed due to the mechanical coupling of the strip stabilizing magnets.
The infinitely variable vertical adjustment of the magnets 6 of the strip stabilization facilitates the following procedure:
For the optimum galvannealing operation (GA operation), the strip stabilizing unit 4, and especially the magnets 6, are positioned by the means 7 (lifting device) directly underneath the inductive heating elements 10. Since the coating thickness for GA products is very thin (maximum 90g/m2) and, therefore, only small improvements in the coating structure can be achieved through the effect of strip stabilization, the main focus of the stabilizing effect concerns the strip travel in the heating element 10 (GA inductor) and, thus, the quality of the GA coating.
Because of the mechanical coupling with the stripping nozzle 3, the stripping nozzle 3 and the magnets 6 of the strip stabilizing unit are always centered relative to the strip 1.
The effect of the strip stabilization into the area of the stripping nozzle 3 is reduced in this case, but is not lost because of the optimal position computation through a mathematical model as it is used in this case. The magnets 6 are positioned more closely adjacent the heating elements (GA inductors) than at the stripping nozzle 3, but with the consideration of the physical effect in both directions.
In other coating products, the focus of the stabilization effect is to minimize the strip movement within the stripping nozzle 3. For this purpose, the position of the magnets 6 of the strip stabilization is selected to be in the area of the stripping nozzle 3.
The guide rollers in front of the heating element, which are used in the previously known plants for stabilizing the strip, are no longer required because it is now possible to . -influence the stabilizing effect in a targeted manner over the entire vertical range between the stripping nozzle and the heating element.
The means 7 (lifting device) also facilitate in an advantageous manner a manual cleaning of the stripping nozzle 3 during operation. The strip stabilizing unit or the magnets 6 are moved into a raised position without losing the stabilizing effect. In previously known systems, this is not possible. This gives the maintenance personnel free access to the stripping nozzle 3 and, thus, can manually clean the nozzle lips. This requirement is available in any hot galvanizing plant.
Positioning of the magnets 6 of the strip stabilization takes place, as explained above, with a device which may include two guides, supports and appropriate clamping devices which cause tensioning of the system and, thus, the parallel alignment of the strip stabilization (of the magnets 6) relative to the strip or to the stripping nozzle carrier system. This device for changing the strip . -stabilization position is fixedly mounted on the stripping nozzle 3, which contains a frame structure with adjusting elements for alignment.
Consequently, the invention in principle is a frame construction which, in turn, is fixedly connected to the basic frame construction of the stripping nozzle 3. This means that with the alignment of the stripping nozzle 3 relative to the strip 1, a synchronous alignment of the magnets 6 of the strip stabilization unit relative to the strip 1 always takes place.
List of Reference Numerals 1 Strip 2 Coating container 3 Stripping nozzle 4 Device for stabilizing Center position 6 Magnet 7 Means for adjusting the vertical position 8 Lifting element 9 Frame structure Heating element 11 Cooling section 12 Holding furnace 13 Deflection roller 14 Deflection roller V Vertical direction Distance
Claims (13)
1. Device for coating a metal strip (1) with a coating material, the device including a coating container (2) filled with a liquid coating material, through which or out of which the coated strip (1) is conducted vertically (V) upwardly, wherein above the coating container (2) is arranged a stripping nozzle (3) for stripping coating material which is still liquid from the surface of the strip, wherein above the stripping nozzle (3) is arranged an electromagnetic device (4) for stabilizing the position of the strip (1) in a center position (5), and wherein the device (4)includes at least two magnets (6) arranged on both sides of the metal strip (1) on the same level, and a control for positioning the magnets (6) characterized by means (7) for flexibly adjusting the vertical distance (H) of the magnets (6) from the stripping nozzle (3), and a control for actuating the means (7).
2. Device according to Claim 1, characterized in that the means (7) for adjusting the vertical distance (H) includes at least one lifting element (8) which is connected directly or indirectly to the stripping nozzle (3).
3. Device according to Claim 2, characterized in that the stripping nozzle (3) has a frame structure (9) on which the at least one lifting element (8) is arranged.
4. Device according to one of Claims 1 to 3, characterized in that a heating element (10) for heating the strip (1) is arranged above the stripping nozzle (3).
5. Device according to Claim 4, characterized in that the heating element (10) is constructed as an inductive element.
6. Device according to Claim 4 or 5, characterized in that the means (7) are constructed for adjusting the vertical distance (H) of the magnets (6) over the entire area in the vertical extension between the stripping nozzle (3) and the heating element (10).
7. Device according to one of Claims 4 to 6, characterized in that a cooling section (11) is arranged above the heating element (10).
8. Device according to Claim 7, characterized in that a holding furnace (12) is arranged between the heating element (10) and the cooling section (11).
9. Device according to one of Claims 1 to 8, characterized in that the means (7) for adjusting the vertical distance (H) includes at least one hydraulic or pneumatic actuator.
10. Device according to one of Claims 1 to 8, characterized in that the means (7) for adjusting the vertical distance (H) includes at least one mechanical actuator.
11. Device according to claim 10 wherein said mechanical actuator comprises a spindle/nut system.
12. Method for coating a metal strip (1) with a coating material, wherein the strip (1) is guided through liquid coating material contained in the coating container (2) and is then vertically upwardly conducted out of the coating container (2), wherein above the coating container (2) any coating material which is still liquid is stripped of the strip surface by a stripping nozzle (3), and wherein above the stripping nozzle (3) the strip is stabilized by means of an electromagnetic device (4) for stabilizing the position of the strip (1) in a center position (5), wherein the device includes at least two magnets (6) arranged on both sides of the strip (1) on the same level, and wherein the vertical distance (H) of the magnets (6) from the stripping nozzle (3) is adjusted by adjustment means in accordance with a predetermined value, and wherein the adjustment means (7) are actuated by a control.
13. Method according to Claim 12, characterized in that during the adjustment of the vertical distance (H) the magnets are always held centered in the center position (5).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102009051932.7 | 2009-11-04 | ||
| DE102009051932A DE102009051932A1 (en) | 2009-11-04 | 2009-11-04 | Apparatus for coating a metallic strip and method therefor |
| PCT/EP2010/066810 WO2011054902A1 (en) | 2009-11-04 | 2010-11-04 | Device for coating a metal strip and method therefor |
Publications (2)
| Publication Number | Publication Date |
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| CA2794925A1 CA2794925A1 (en) | 2011-05-12 |
| CA2794925C true CA2794925C (en) | 2014-08-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CA2794925A Active CA2794925C (en) | 2009-11-04 | 2010-11-04 | Device for coating metal strip and method therefor |
Country Status (11)
| Country | Link |
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| EP (1) | EP2496728B1 (en) |
| JP (1) | JP5663763B2 (en) |
| KR (1) | KR101421981B1 (en) |
| CN (1) | CN102597295B (en) |
| CA (1) | CA2794925C (en) |
| DE (1) | DE102009051932A1 (en) |
| ES (1) | ES2660746T3 (en) |
| HU (1) | HUE038462T2 (en) |
| PL (1) | PL2496728T3 (en) |
| TR (1) | TR201802499T4 (en) |
| WO (1) | WO2011054902A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102014225516B3 (en) | 2014-11-21 | 2016-03-31 | Fontaine Engineering Und Maschinen Gmbh | Method and device for coating a metal strip |
| NO2786187T3 (en) | 2014-11-21 | 2018-07-28 | ||
| DE102015216721B3 (en) * | 2015-09-01 | 2016-11-24 | Fontaine Engineering Und Maschinen Gmbh | Apparatus for treating a metal strip |
| DE102016222230A1 (en) | 2016-08-26 | 2018-03-01 | Sms Group Gmbh | Method and coating device for coating a metal strip |
| DE102017109559B3 (en) | 2017-05-04 | 2018-07-26 | Fontaine Engineering Und Maschinen Gmbh | Apparatus for treating a metal strip |
| DE102018215100A1 (en) * | 2018-05-28 | 2019-11-28 | Sms Group Gmbh | Vacuum coating apparatus, and method for coating a belt-shaped material |
| DE102018219134B3 (en) * | 2018-11-09 | 2020-01-30 | Thyssenkrupp Ag | Device and method for the thermal treatment of a surface of a moving metal strip |
| CN109526081A (en) * | 2018-12-27 | 2019-03-26 | 邵阳高华工贸实业有限公司 | A kind of induction heating equipment and method for reinforcing bar production |
| IT201900023484A1 (en) * | 2019-12-10 | 2021-06-10 | Danieli Off Mecc | STABILIZATION APPARATUS |
Family Cites Families (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0681093A (en) * | 1992-08-31 | 1994-03-22 | Kawasaki Steel Corp | Hot dip metal coating equipment for strip |
| DE4344939C1 (en) | 1993-12-23 | 1995-02-09 | Mannesmann Ag | Method for the control, suitable for the process, of an installation for coating strip-shaped material |
| DE19535854C2 (en) | 1995-09-18 | 1997-12-11 | Mannesmann Ag | Process for strip stabilization in a plant for coating strip-like material |
| KR100207710B1 (en) * | 1996-12-27 | 1999-07-15 | 윤종용 | Printing apparatus for pda and method therefor |
| JPH116046A (en) | 1997-06-18 | 1999-01-12 | Nippon Steel Corp | Method for removing dross in continuous hot-dipping metal coating line and device therefor |
| FR2797277A1 (en) | 1999-08-05 | 2001-02-09 | Lorraine Laminage | METHOD AND DEVICE FOR THE CONTINUOUS PRODUCTION OF A METAL SURFACE COATING ON A SLIP |
| JP2001150015A (en) * | 1999-11-30 | 2001-06-05 | Shinko Electric Co Ltd | Position and vibratory control apparatus for steel plate |
| SE0002889L (en) | 2000-08-11 | 2002-02-12 | Abb Ab | An apparatus and method for controlling the thickness of a coating on a metallic article |
| JP4547818B2 (en) * | 2001-03-16 | 2010-09-22 | Ｊｆｅスチール株式会社 | Method for controlling the coating amount of hot dip galvanized steel sheet |
| JP4450662B2 (en) * | 2004-04-05 | 2010-04-14 | 三菱日立製鉄機械株式会社 | Steel plate damping device |
| SE527507C2 (en) * | 2004-07-13 | 2006-03-28 | Abb Ab | An apparatus and method for stabilizing a metallic article as well as a use of the apparatus |
| DE102005060058B4 (en) * | 2005-12-15 | 2016-01-28 | Emg Automation Gmbh | Method and device for stabilizing a band |
| DE102006052000A1 (en) * | 2006-11-03 | 2008-05-08 | Emg Automation Gmbh | Device for stabilizing the run of a metal strip |
| US20100285239A1 (en) * | 2007-08-22 | 2010-11-11 | Holger Behrens | Method of and hot-dip installation for stabilizing a strip guided between stripping dies of the hot-dip coating installation and provided with a coating |
| DE102007045202A1 (en) * | 2007-09-21 | 2009-04-02 | Sms Demag Ag | Device for strip edge stabilization |
| KR100899550B1 (en) * | 2007-11-01 | 2009-05-26 | 현대하이스코 주식회사 | Manufacturing process of galvannealed hot dip coated steel sheet |
-
2009
- 2009-11-04 DE DE102009051932A patent/DE102009051932A1/en not_active Withdrawn
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2010
- 2010-11-04 EP EP10774210.8A patent/EP2496728B1/en active Active
- 2010-11-04 PL PL10774210T patent/PL2496728T3/en unknown
- 2010-11-04 KR KR1020127011678A patent/KR101421981B1/en active IP Right Grant
- 2010-11-04 WO PCT/EP2010/066810 patent/WO2011054902A1/en active Application Filing
- 2010-11-04 TR TR2018/02499T patent/TR201802499T4/en unknown
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- 2010-11-04 JP JP2012537399A patent/JP5663763B2/en active Active
- 2010-11-04 HU HUE10774210A patent/HUE038462T2/en unknown
Also Published As
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|---|---|
| KR101421981B1 (en) | 2014-08-13 |
| CA2794925A1 (en) | 2011-05-12 |
| EP2496728A1 (en) | 2012-09-12 |
| CN102597295B (en) | 2015-04-22 |
| TR201802499T4 (en) | 2018-03-21 |
| KR20120063550A (en) | 2012-06-15 |
| EP2496728B1 (en) | 2018-01-03 |
| WO2011054902A1 (en) | 2011-05-12 |
| DE102009051932A1 (en) | 2011-05-05 |
| CN102597295A (en) | 2012-07-18 |
| ES2660746T3 (en) | 2018-03-26 |
| JP2013510236A (en) | 2013-03-21 |
| HUE038462T2 (en) | 2018-10-29 |
| JP5663763B2 (en) | 2015-02-04 |
| PL2496728T3 (en) | 2018-06-29 |
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