CN111295461A

CN111295461A - Plate warp correcting device for metal plate and continuous plating processing equipment for metal plate

Info

Publication number: CN111295461A
Application number: CN201780096430.XA
Authority: CN
Inventors: 米仓隆; 丹原正雄; 吉川雅司
Original assignee: Primetals Technologies Japan Ltd
Current assignee: Primetals Technologies Japan Ltd
Priority date: 2017-11-30
Filing date: 2017-11-30
Publication date: 2020-06-16
Also published as: EP3686311A1; EP3686311B1; WO2019106785A1; JP6381858B1; EP3686311A4; US20200261957A1; JPWO2019106785A1

Abstract

A device for correcting the warpage of a metal sheet, which is used in a continuous plating facility for metal sheets, is characterized by comprising: a sink roll disposed in the molten metal bath for plating on a downstream side in the conveying direction of the metal plate from the fixing roll that changes the conveying direction of the metal plate; and a correcting roller disposed between the fixed roller and the sink roller and correcting the warp of the metal plate, wherein a ratio D3/D1 between a diameter D3 of the sink roller and a diameter D1 of the fixed roller is 1.5 or more.

Description

Plate warp correcting device for metal plate and continuous plating processing equipment for metal plate

Technical Field

The present invention relates to a device for correcting warpage of a metal sheet and a continuous plating apparatus for metal sheets.

Background

When a strip-shaped metal plate is continuously subjected to a hot-dip plating treatment, it is sometimes required to reduce the warp of the metal plate in the plate width direction on the delivery side of a bath (plating bath) of molten metal and flatten the metal plate, for example, for the reason of making the amount of molten metal adhering to the metal plate uniform.

As a mechanism for reducing the warp of the metal plate in the width direction on the delivery side of the molten metal tank, for example, patent documents 1 and 2 disclose a continuous hot-dip plating apparatus in which a roll for applying a warp in the opposite direction to the warp in the width direction of the steel strip after passing through a sink roll in a plating bath is provided on the upstream side of the plating bath used for hot-dip plating of the steel strip.

Patent document 2 discloses: the axis of the above-mentioned roller (buffer roller) provided on the upstream side of the plating bath is moved in parallel to adjust the amount of press-fitting of the roller into the steel sheet in the conveyance line direction, and the amount of press-fitting can be adjusted according to the sheet width of the steel sheet.

Documents of the prior art

Patent document

Patent document 1: japanese laid-open patent publication No. 2-54746

Patent document 2: japanese laid-open patent publication No. 3-166354

Disclosure of Invention

Problems to be solved by the invention

However, as a result of intensive studies, the present inventors have found that, when a leveling roll for imparting a warp in a direction opposite to a warp in a width direction of a metal sheet passing through a sink roll is provided on an upstream side of a molten metal tank (plating bath) as described in patent documents 1 and 2, particularly when the thickness of the metal sheet is large (for example, about 1.5mm or more in the case of a steel sheet), even if an apparent diameter (press-in amount) of the leveling roll is changed between a minimum value and a maximum value, the metal warp sheet generated on the upstream side of the leveling roll cannot be effectively corrected.

In view of the above circumstances, an object of at least one embodiment of the present invention is to provide a device for correcting warpage in a metal plate and a continuous plating apparatus for a metal plate, which can effectively correct warpage in a plate width direction of a metal plate even when the plate thickness is large.

Means for solving the problems

A device for correcting a sheet warp of a metal sheet according to at least one embodiment of the present invention is a device for correcting a sheet warp of a metal sheet used in a continuous plating facility for a metal sheet, the device for correcting a sheet warp of a metal sheet including:

a sink roll disposed in the molten metal bath for plating on a downstream side in the conveying direction of the metal plate from the fixing roll that changes the conveying direction of the metal plate; and

a correcting roller disposed between the fixed roller and the sink roller and correcting a warp of the metal plate,

the ratio D3/D1 of the diameter D3 of the sink roll to the diameter D1 of the fixed roll is 1.5 or more.

Effects of the invention

According to at least one embodiment of the present invention, there is provided a warp correcting device for a metal plate and a continuous plating apparatus for a metal plate, which can effectively correct a warp of the metal plate in a plate width direction even when the plate thickness is large.

Drawings

Fig. 1 is a schematic configuration diagram of a continuous plating apparatus according to an embodiment.

Fig. 2 is a schematic view of a plate warp correcting apparatus according to an embodiment.

Fig. 3 is a diagram for explaining the amount of plate warping of the metal plate.

Fig. 4 is a graph showing an example of the correlation between the amount of plate warp of the metal plate corrected by the plate warp correcting device and the diameter D3 of the sink roll according to the embodiment.

Fig. 5 is a graph showing an example of the correlation between the amount of plate warp of the metal plate corrected by the plate warp correcting device and the diameter D3 of the sink roll according to the embodiment.

Fig. 6 is a graph showing an example of the correlation between the amount of plate warp of the metal plate straightened by the plate warp straightening device and the apparent diameter D2 of the straightening roller according to the embodiment.

Fig. 7 is a graph showing an example of the correlation between the sheet warp amount of the metal sheet corrected by the sheet warp correcting device and the apparent diameter D2 of the correcting roller of the comparative example.

Fig. 8 is a diagram for explaining an example of a method of calculating the apparent diameter D2.

Detailed Description

Several embodiments of the present invention will be described below with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the constituent members described as the embodiments or shown in the drawings are not intended to limit the scope of the present invention to these, but are merely illustrative examples.

First, the overall structure of a continuous plating apparatus according to several embodiments will be described with reference to fig. 1.

Fig. 1 is a schematic configuration diagram of a continuous plating apparatus according to an embodiment. As shown in fig. 1, the continuous plating apparatus 100 is an apparatus for continuously performing a plating process on a strip-shaped metal plate 2 (for example, a steel plate), and includes a furnace 3 for heat-treating the metal plate 2, a pot 6 (molten metal pot) provided outside the furnace 3 and forming a plating bath 8, and a wiping nozzle 10 for adjusting an amount of a plating solution (molten metal) adhering to the metal plate 2.

Note that, an arrow in fig. 1 indicates a conveying direction (moving direction) of the metal plate 2.

The furnace 3 is a device for heat-treating the metal plate 2 passing through the inside of the furnace 3, and may be configured to continuously perform annealing treatment on the metal plate 2, for example.

A plurality of rollers 14 are provided inside the furnace 3. The metal sheet 2 can be continuously processed by applying tension to the metal sheet 2 by the rollers 14 or by transferring the direction of the metal sheet 2 to convey the metal sheet 2.

A reducing or non-oxidizing gas may be supplied into the furnace 3.

Tension rollers

16A, 16B for adjusting tension applied to the metal plate 2 are provided at the outlet portion 4 of the furnace 3 shown in fig. 1.

The temperature inside the furnace 3 may vary depending on the location. For example, the temperature at the outlet 4 of the furnace 3 is low, while the temperature at a position on the upstream side in the conveying direction of the metal plate 2 than the outlet 4 (hereinafter, also simply referred to as "upstream side"), for example, near the burner, is high. In this way, when there is a temperature distribution in the furnace, the tension to be applied to the metal plate differs depending on the position in the furnace. Therefore, the

tension rollers

16A and 16B may be configured to apply an appropriate tension to the metal plate 2 in accordance with the temperature distribution in the furnace 3, for example.

A furnace nose 5, which is a cylindrical member forming a passage for the metal plate 2, is provided between the outlet 4 of the furnace 3 and the kettle 6. The end of the snout 5 on the side of the vessel 6 is immersed in the molten metal (plating bath 8) stored in the vessel 6 to prevent gas from flowing out of the furnace 3 or gas (for example, air) from flowing in from the outside of the furnace 3.

Molten metal as a plating solution is stored in the pot 6, thereby forming a plating bath 8.

The type of the molten metal stored in the vessel 6 is not particularly limited, and for example, when the metal plate 2 is a steel plate, zinc, aluminum, or an alloy containing these metals may be used.

In addition, a sink roll 20 is provided in the tank 6. The metal plate 2 introduced into the plating bath 8 from the inside of the furnace 3 through the nose 5 is turned upward by the sink roll 20, and the metal plate 2 with the molten metal adhering to the surface thereof advances upward of the pot 6.

The wiping nozzle 10 and the plate warp measuring device 12 are provided on the downstream side (hereinafter, also simply referred to as "downstream side") of the sink roll 20 in the conveying direction of the metal plate 2.

The wiping nozzle 10 may also include, for example, a slit that extends in the sheet width direction of the metal sheet 2 and opens toward the conveyance line of the metal sheet 2. The wiping nozzle 10 is configured to blow a gas toward the conveyed metal plate 2 from the slit, for example, and remove the molten metal adhering excessively to the metal plate 2 by blowing off the gas so that the thickness of the molten metal on the surface of the metal plate 2 becomes uniform.

The board warp measuring device 12 is a device for measuring the warp amount of the metal plate 2 at the installation position of the board warp measuring device 12, and may be installed at any one of the upstream side or the downstream side of the wiping nozzle 10. The board warp measuring device 12 may include, for example, a plurality of position sensors arranged along the width direction of the metal plate 2 and configured to be capable of measuring the distance from the metal plate 2.

As described later, the board warp correction device 1 according to some embodiments may be configured to correct the board warp based on the measurement result of the board warp measurement device 12.

At least some of the plurality of rollers 14 provided inside the furnace 3 are configured to change the conveying direction of the metal sheet 2 to be conveyed during normal operation of the continuous plating apparatus 100. In the roller that changes the conveying direction of the metal plate 2, the metal plate 2 is usually wound around the roller, and for example, in the roller that changes the conveying direction of the metal plate 2 by 90 ° or more, it is easy to visually confirm that the metal plate is wound around the roller. In this manner, in a state where the metal plate 2 is wound around the roller, a warp (C-shaped warp) in the plate width direction is usually generated in the metal plate 2.

The phrase "the metal plate 2 is wound around the roller 14" means that the bending diameter of the metal plate 2 is equal to the diameter of the roller 14, that is, the metal plate 2 is in surface contact with the roller 14.

In addition, at least some of the plurality of rolls 14 are fixed rolls in which the positions of the rotational axes of the rolls 14 are fixed at the time of normal operation of the continuous plating apparatus 100.

Next, referring to fig. 1 to 3, a description will be given of a board warp correction device 1 applied to the continuous plating apparatus 100 described above.

Fig. 2 is a schematic diagram of the plate warp correcting apparatus 1 according to the embodiment, and fig. 3 is a diagram for explaining the plate warp amount w of the metal plate 2, and shows a cross section of the metal plate 2 at a plane orthogonal to the conveying direction at the position of the wiping nozzle 10. Fig. 2 is a partially enlarged view of the continuous plating apparatus 100 shown in fig. 1, and in fig. 2, the furnace 3 and the furnace nose 5 shown in fig. 1 are omitted for convenience of explanation.

As shown in fig. 1 and 2, a plate warp correcting device 1 according to one embodiment includes: a sink roll 20 disposed in the tank 6 downstream of the tension roll 16B as a fixed roll for changing the conveying direction of the metal sheet 2, and a leveling roll 18 disposed between the tension roll 16B (fixed roll) and the sink roll 20. The leveling roll 18 is disposed above the plating bath 8, and may be disposed inside the snout 5 as shown in fig. 1.

The tension roller 16B is one of the

tension rollers

16A and 16B provided in the outlet portion 4 of the furnace 3, which is located on the downstream side.

The leveling roller 18 is constituted by: by moving the rotation shaft 19 of the leveling roller 18, the pushing amount d2 (see fig. 2) toward the metal plate 2 (or toward the conveyance line of the metal plate 2) can be adjusted. As shown in fig. 1 and 2, the leveling roller 18 is provided on the opposite side of the tension roller 16B (fixed roller) and the sink roller 20 with the metal plate 2 interposed therebetween.

In fig. 2, the leveling roller 18 and the metal plate 2 when the pushing amount d2 is zero are shown by broken lines, and in this case, the metal plate 2 has a linear shape between the tension roller 16B and the sink roller 20 without being pushed by the leveling roller 18.

The leveling roller 18 has an apparent diameter D2 corresponding to the penetration D2. The apparent diameter D2 of the leveling roller 18 is a value defined by 2 times the reciprocal of the curvature of the metal sheet 2 in the vicinity of the contact portion where the metal sheet 2 contacts the leveling roller 18. The apparent diameter D2 is influenced by both geometrical conditions such as the thickness and width of the leveling roll, the fixed roll, and the metal plate, and mechanical characteristics such as the young's modulus, yield stress, and plate tension of the metal plate 2, but can be adjusted from the actual diameter of the leveling roll 18 (the state where the metal plate 2 is wound around the roll 18) to infinity (the state where the press-in amount D2 is zero) by adjusting the press-in amount D2.

Here, fig. 8 is a diagram for explaining an example of a method of calculating the apparent diameter D2.

As shown in fig. 8, for example, the apparent diameter D2 of the leveling roller 18 is defined by x-axis and y-axis in any two directions orthogonal to each other in a vertical plane including the direction in which the metal plate 2 extends, and an approximate curve is established as a function of y ═ f (x) before and after the contact point Pc (state of approaching point contact in side view) between the metal plate 2 and the press-in roller with respect to the curved shape of the metal plate 2 in the vertical plane. The curvature radius is obtained by differentiating x by 2 th order in the vicinity of the contact portion where the sheet and the roller contact each other, and 2 times the curvature radius becomes the apparent diameter D2.

The curve of the metal plate 2 in the vertical plane can also be obtained based on continuous actual measurement of the height of the side surface of the metal plate 2 with respect to a horizontal line and information processing of a photograph of the side surface of the metal plate 2.

However, during the actual operation of the apparatus for correcting sheet warp 1, the apparent radius D2 may be in a state of an appropriate range as a result of adjusting the press-fitting amount D2 of the correcting roller 18 without measuring the curvature radius.

In the plate warp correcting device 1 shown in fig. 1 and 2, the ratio D3/D1 between the diameter D3 of the sink roller and the diameter D1 of the tension roller 16B (fixed roller) is 1.5 or more.

In the plate warp correcting apparatus 1 shown in fig. 1 and 2, the diameter D1 of the tension roller 16B (fixed roller), the apparent diameter D2 of the correcting roller 18, and the diameter D3 of the sink roller 20 satisfy the relationship of D1 < D2 < D3.

In the continuous plating apparatus 100 described above, there are cases where a sheet warp in the sheet width direction (as shown in fig. 3, a warp in which the central portion in the sheet width direction protrudes in the sheet thickness direction beyond both ends in the sheet width direction, that is, a C-shaped warp) occurs on the output side of each of the tension roll 16B (fixed roll), the leveling roll 18, and the sink roll 20.

Here, the plate warping amount w (see fig. 3) of the metal plate 2 in the present specification means a distance between both end points of the metal plate 2 in the plate thickness direction in the plate width direction.

The direction of deformation of the warp in the sheet width direction applied to the metal sheet 2 by each of the rollers (the projecting direction of the central portion of the metal sheet 2 in the sheet width direction) is determined according to the positional relationship between the roller and the metal sheet 2.

For example, as shown in fig. 3, in the plate warp correcting device 1 shown in fig. 1 and 2, when both surfaces of the metal plate 2 are a first surface 2a and a second surface 2B, the warp in the plate width direction applied to the metal plate 2 by the tension roller 16B (fixed roller) and the sink roller 20 is a warp in a direction in which the central portion of the metal plate 2 protrudes in the plate thickness direction to the first surface 2a side (i.e., a direction shown in fig. 3), and the warp in the plate width direction applied to the metal plate 2 by the correcting roller 18 is a warp in a direction in which the central portion of the metal plate 2 protrudes in the plate thickness direction to the second surface 2B side (i.e., a direction opposite to the direction shown in fig. 3).

When the sheet metal 2 is warped in the sheet width direction as described above at the position of the wiping nozzle 10 on the downstream side of the sink roll 20, the distances between the wiping nozzle 10 and the sheet metal 2 are distributed in the sheet width direction. In this way, the amount of the molten metal (plating solution) blown off by the wiping nozzle 10 becomes uneven in the plate width direction depending on the distance between the wiping nozzle 10 and the metal plate 2. For example, in a place where the distance between the wiping nozzle 10 and the metal plate 2 is large, the amount of molten metal (plating solution) blown off by the wiping nozzle 10 is reduced, and thus the plating thickness becomes thick. In contrast, where the distance between the wiping nozzle 10 and the metal plate 2 is small, the amount of molten metal (plating solution) blown off by the wiping nozzle 10 increases, and thus the plating thickness becomes thin. In the case where the plating thickness is not uniform, if the plating thickness is to be ensured at the minimum portion, the cost increases according to the plating thickness. In addition, in the case of welding the metal plates in the subsequent step due to such unevenness in plating thickness in the metal plate 2, unevenness may occur in weldability (welding strength), and the quality of the product as the metal plate 2 may be degraded.

In this regard, according to the plate warp correcting device 1 of the above embodiment, since the ratio D3/D1 of the diameter D3 of the sink roll 20 to the diameter D1 of the tension roll 16B (fixed roll) is set to 1.5 or more, as described below with reference to fig. 4 to 7, the plate warp in the plate width direction on the output side of the sink roll 20 can be effectively corrected.

Here, fig. 4 and 5 are graphs each showing an example of the correlation between the plate warp amount w of the metal plate 2 on the output side of the sink roll 20 and the diameter D3 of the sink roll 20 in the plate warp correction device 1 according to the embodiment, and show, with diagonal lines, the range of the plate warp amount w that can be generated when the apparent diameter D2 (or the press-in amount D2) of the correction roll 18 is changed between 800mm and 2000mm when the plate thickness t of the metal plate 2 is 3.2mm and 2.3mm and the diameter D1 of the tension roll 16B (fixed roll) is 800 mm. In any of the figures, the line with the smaller value of the warpage amount w indicates the case where D2 is 800mm, and the line with the larger value of the warpage amount w indicates the case where D2 is 2000 mm.

As is clear from the graphs of fig. 4 and 5, the larger the diameter D3 of the sink roll is, the larger the width of the plate warp amount w that can be adjusted by the apparent diameter D2 (or the press-in amount D2) of the leveling roll 18 is, regardless of the plate thickness t, and the more easily the plate warp w can be adjusted to 0.

Fig. 6 and 7 are graphs each showing an example of a correlation between the sheet warp amount w of the metal sheet 2 on the output side of the sink roll 20 and the apparent diameter D2 of the leveling roll 18 in the sheet warp leveling devices 1 of the examples and comparative examples. Fig. 6 is a graph in the case where the diameter D1 of the tension roller 16B (fixed roller) is 800mm, the diameter D3 of the sink roller 20 is 2000mm, and D3/D1 is 2.5 in the above-described board warp correction device 1, and fig. 7 is a graph in the case where D1 is 800mm, D3 is 900mm, and D3/D1 is 1.1 in the above-described board warp correction device 1. In the graph, t represents the thickness of the metal plate 2.

As is clear from the graph of fig. 7, in the board warp correction device set to D3/D1 equal to 1.1, when the board thickness is 1 to 2mm and is thin, the board warp amount in the board width direction on the output side of the sink roll 20 can be reduced to near zero by appropriately adjusting the apparent diameter D2 of the correction roll 18 (that is, by appropriately adjusting the press-in amount D2 of the correction roll 18), while when the board thickness is 3 to 4mm and is large, the board warp amount in the board width direction cannot be reduced to near zero even if the apparent diameter D2 of the correction roll 18 is adjusted.

On the other hand, as is apparent from the graph of fig. 6, in the board warp correction device set to D3/D1 of 2.5, the board warp amount in the board width direction on the output side of the sink roll 20 can be reduced to near zero by appropriately adjusting the apparent diameter D2 of the correcting roll 18 (i.e., by appropriately adjusting the press-in amount D2 of the correcting roll 18) in a wide board thickness range where t is 1.2mm to 4.5 mm.

That is, it is found that the larger the ratio D3/D1 between the diameter D3 of the sink roll 20 and the diameter D1 of the tension roll 16B (fixed roll), the larger the plate thickness t of the metal plate 2, which can make the amount of plate warp of the sink roll 20 close to zero, can be increased by adjusting the apparent diameter D2 (or the press-in amount D2) of the leveling roll 18.

Based on these findings, in the plate warp correction device 1 of the above embodiment, the ratio D3/D1 between the diameter D3 of the sink roll 20 and the diameter D1 of the tension roll 16B (fixed roll) is set to 1.5 or more, and therefore, by appropriately adjusting the apparent diameter D2 (or the press-in amount D2) of the correction roll 18, even when the plate thickness t of the metal plate 2 is large, the warp amount w in the plate width direction of the metal plate 2 on the output side of the reactor 6 can be effectively reduced, and the plate warp of the metal plate 2 can be corrected.

Therefore, for example, the amount of molten metal adhering to the surface of the metal plate 2 can be easily made uniform by the wiping nozzle 10 or the like provided on the downstream side of the vessel 6 in the metal plate conveying direction.

In the sheet warp correcting device 1, when the diameter D1 of the tension roller 16B (fixed roller), the apparent diameter D2 of the correction roller 18, and the diameter D2 of the sink roller 20 satisfy the relationship of D1 < D2 < D3, the amount of plastic deformation applied to the metal sheet 2 by the tension roller 16B (fixed roller), the correction roller 18, and the sink roller 20 increases in the order of the sink roller 20, the correction roller 18, and the tension roller 16B (fixed roller). Thus, the sheet warp of the metal sheet 2 on the output side of the sink roll 20 can be effectively corrected within the adjustment range of the plastic deformation of the correcting roll 18.

In some embodiments, the board warp correcting apparatus 1 may further include a controller (not shown) configured to adjust the pressing amount d2 of the correcting roller 18 toward the metal plate 2 based on the measurement result of the board warp amount measured by the board warp measuring device 12.

For example, the controller may be configured to adjust the amount d2 of pressing the leveling rollers 18 into the metal plate 2 so that the plate warp amount w approaches zero by feedback control based on the plate warp amount w on the output side of the sink roller 20 measured by the plate warp measuring device 12.

In the case where the plate warp measuring device 12 includes the plurality of position sensors arranged in the plate width direction of the metal plate 2 and configured to be able to measure the distances from the metal plate 2, the controller may be configured to calculate the plate warp w on the output side of the sink roll 20 of the metal plate 2 based on the detection results detected by the plurality of position sensors and adjust the press-in amount d2 of the leveling roll 18 toward the metal plate 2 based on the plate warp w thus calculated.

The board warp correction device 1 and the continuous plating apparatus 100 according to some embodiments will be described in brief below.

(1) A device for correcting a sheet warp of a metal sheet according to at least one embodiment of the present invention is a device for correcting a sheet warp of a metal sheet used in a continuous plating facility for a metal sheet, the device for correcting a sheet warp of a metal sheet including:

When the metal sheet is deformed in this order of the fixed rollers, the leveling rollers, and the sink rollers, the metal sheet may be warped in the sheet width direction (hereinafter, also referred to as "C-shaped warp" or simply "warp") on the output side of each roller. According to the findings of the present inventors, as the ratio D3/D1 between the diameter D3 of the sink roll and the diameter D1 of the fixed roll is larger, the width of the adjustable plate warp amount in the plate width direction on the output side of the sink roll can be increased by adjusting the apparent diameter D2 of the leveling roll, and the plate thickness of the metal plate in which the plate warp amount can be made close to zero can be increased.

In this regard, in the configuration of the above (1), since D3/D1 is set to 1.5 or more, even when the plate thickness is large, the warp of the metal plate in the plate width direction on the delivery side of the molten metal pot can be effectively reduced and the warp of the metal plate can be corrected by appropriately adjusting the apparent diameter D2 of the correcting roller.

Therefore, for example, the amount of molten metal adhering to the surface of the metal plate can be easily made uniform by a gas wiper or the like on the downstream side of the molten metal bath in the metal plate conveying direction.

In the case where the leveling rolls for leveling the warp on the outlet side of the molten metal pot are provided in the molten metal pot on the downstream side of the sink rolls, unlike in the case of (1), the bearings of the leveling rolls need to have a large gap for preventing the foreign matter from biting into them. In this case, the backlash is likely to occur due to the clearance of the bearing, and it is difficult to correct the warpage of the metal plate with high accuracy.

In this regard, in the configuration of the above (1), since the leveling rolls are disposed between the fixed rolls and the sink rolls (i.e., on the upstream side of the sink rolls in the conveying direction of the metal sheet), it is not necessary to provide the leveling rolls in the molten metal bath. Therefore, the bearing with less backlash can be used, and the amount of warp of the metal plate can be accurately adjusted. Further, since the leveling rollers in the molten metal vessel can be eliminated, it is possible to use the sink rollers having a larger diameter without increasing the size of the conventional molten metal vessel on the premise of providing the leveling rollers in the vessel.

The "fixed roller" in the above (1) may be a roller that causes a sheet warp occurring in the metal sheet on the output side of the sink roller. That is, the "fixed roll" in the above (1) may be the tension roll 16B in the above-described board warp correcting device 1, or may be another roll 14 fixed inside the furnace 3. The "fixed roller" in the above (1) may be a fixed roller located on the most downstream side among the fixed rollers that change the conveying direction of the metal sheet.

(2) In some embodiments, in addition to the structure of the above (1),

the leveling roller can adjust the amount of pressing of the leveling roller into the metal plate side.

According to the configuration of the above (2), the amount of plastic deformation of the metal plate can be changed by the leveling roll by adjusting the amount of press-fitting of the leveling roll to the metal plate side (that is, by adjusting the apparent diameter D2 of the leveling roll). Therefore, by appropriately adjusting the press-fitting amount, the warp of the metal plate in the plate width direction on the delivery side of the molten metal pot can be effectively corrected.

(3) In some embodiments, in addition to the structure of the above (1) or (2),

when the apparent diameter of the leveling roll corresponding to the press-in amount of the leveling roll to the metal plate side is D2, the relationship of D1 < D2 < D3 is established.

According to the configuration of the above (3), the plastic deformation amounts applied to the metal plate by the fixed roll, the leveling roll, and the sink roll are increased in the order of the sink roll, the leveling roll, and the fixed roll. Thereby. The warp of the metal plate on the output side of the molten metal pot can be effectively corrected within the adjustment range of the plastic deformation of the correcting roller.

(4) In several embodiments, in addition to any one of the structures (1) to (3) above,

the diameter D3 of the sink roll is 1200mm or more.

Alternatively, in some embodiments, in addition to any one of the configurations (1) to (3), the diameter D3 of the sink roll is 1300mm or more.

In general, the diameter of the sink roll provided in the molten metal bath is about 1000mm even if it is large. Further, in the case where a sink roll having a larger diameter is used, a larger facility is required for facilities other than the sink roll (for example, a molten metal pot for housing the sink roll), and the facility cost increases.

According to the configuration of the above (4), although the above-described case exists, since the sink roll having a diameter of 1200mm or more or 1300mm or more which is much larger than usual is used, it is easy to set D3/D1 to 1.5 or more when a fixed roll of a typical size is used. Thus, even when the plate thickness is large, the warp of the metal plate in the plate width direction on the delivery side of the molten metal pot can be corrected effectively by appropriately adjusting the apparent diameter D2 of the correcting roller.

(5) In several embodiments, in addition to any one of the structures (1) to (4) above,

the fixed rollers are provided inside a furnace for heat-treating a metal sheet.

According to the configuration of the above (5), when the fixed rolls are provided inside a furnace (e.g., an annealing furnace or the like) for heat-treating the metal sheet, the warp of the metal sheet in the sheet width direction on the delivery side of the molten metal pot can be effectively corrected even when the sheet thickness is large by appropriately adjusting the apparent diameter D2 of the correcting rolls as described in the above (1).

(6) In some embodiments, in addition to the structure of (5) above,

the fixed roller is arranged at the outlet part of the furnace.

In some cases, a plurality of rollers are provided inside a heating furnace for a metal sheet to convey the metal sheet while appropriately changing the direction, and the roller provided at the exit portion of the furnace is a roller provided at the most downstream side among the plurality of rollers. Further, the roller provided on the most downstream side is likely to cause the predominant warp of the sheet in the sheet width direction on the input side of the leveling roller.

In this regard, according to the configuration of the above (6), the warp in the sheet width direction which is predominantly formed by the fixed rolls provided at the outlet portion of the furnace can be effectively corrected by the correcting rolls and the sink rolls.

(7) In several embodiments, in addition to any one of the structures (1) to (6) above,

the fixed roller is a tension roller for adjusting tension applied to the metal plate.

The tension roll is generally provided at the exit of the furnace, and tends to cause the predominant warp of the sheet in the sheet width direction on the entry side of the leveling roll.

According to the configuration of the above (7), the warp in the sheet width direction which is predominantly formed by the tension roller can be effectively corrected by the correcting roller and the sink roller.

(8) In several embodiments, in addition to any one of the structures (1) to (7) above,

the leveling roller is disposed inside a furnace nose disposed between an outlet portion of a furnace for heat-treating a metal plate and a molten metal pot.

(9) In several embodiments, in addition to the structures of (1) to (8) above,

the device for correcting sheet warpage in a metal sheet further comprises:

a plate warp measuring device provided on the downstream side of the sink roll in the conveying direction; and

and a controller configured to control the press-fitting amount of the leveling roller to the metal plate side based on the measurement result of the plate warp measuring device, and adjust the apparent diameter D2 of the leveling roller.

According to the configuration of the above (9), the apparent diameter D2 of the leveling roller is adjusted by controlling the amount of pressing the leveling roller into the metal plate side based on the measurement result of the plate warp measuring device by the controller, and therefore, by appropriately adjusting the apparent diameter D2 of the leveling roller, the warp of the metal plate in the plate width direction can be effectively corrected.

(10) The continuous plating equipment for metal plates according to at least one embodiment of the present invention is characterized by including any one of the plate warp correction devices (1) to (9).

According to the configuration of the above (10), since D3/D1 is set to 1.5 or more, even when the plate thickness is large, the warp of the metal plate in the plate width direction on the delivery side of the molten metal pot can be effectively reduced and the warp of the metal plate can be corrected by appropriately adjusting the apparent diameter D2 of the correcting roller.

Therefore, for example, the amount of molten metal adhering to the surface of the metal plate can be easily made uniform by a gas wiper or the like located downstream of the molten metal kettle in the metal plate conveying direction.

While the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and includes a mode in which the above embodiments are modified and a mode in which these modes are appropriately combined.

In the present specification, expressions indicating relative or absolute arrangements such as "in a certain direction", "along a certain direction", "parallel", "orthogonal", "central", "concentric", or "coaxial" indicate not only such arrangements as being strict but also a state in which angles or distances having tolerances or degrees to obtain the same function are relatively displaced.

For example, expressions indicating states of equality such as "equal", and "homogeneous" indicate not only states of strict equality but also states of tolerance or difference in degree of obtaining the same function.

In the present specification, the expression "shape" such as a rectangular shape or a cylindrical shape means not only a shape such as a geometrically strict rectangular shape or a cylindrical shape, but also a shape including a concave-convex portion, a chamfered portion, and the like within a range in which the same effect can be obtained.

In the present specification, the expression "including", or "having" a component is not an exclusive expression excluding the presence of other components.

Description of the reference numerals

1 plate warping correction device

2 Metal plate

2a first side

2b second side

3 furnace

4 outlet part

5 furnace nose

6 kettle (molten metal kettle)

8 plating bath

10 wiping nozzle

12 board warpage measuring device

14 rolls

16A tensioning roller

16B tensioning roller

17 imaginary roller

18 correcting roller

19 rotating shaft

20 sink roll

100 continuous plating treatment apparatus

d2 indentation capacity

w amount of warpage of the board.

Claims

1. A plate warp correcting device for a metal plate, which is used in a continuous plating treatment apparatus for a metal plate, characterized in that

The device for correcting the sheet warp of the metal sheet comprises:

2. The apparatus for correcting plate warpage of metal plates according to claim 1,

3. The device for correcting warp of a metal sheet according to claim 1 or 2,

4. The device for correcting plate warpage of metal plates according to any one of claims 1 to 3,

the diameter D3 of the sink roll is 1200mm or more.

5. The device for correcting plate warpage of metal plates according to any one of claims 1 to 4, wherein,

the fixing roller is disposed inside a furnace for heat-treating the metal sheet.

6. The apparatus for correcting plate warpage of metal plates according to claim 5,

the fixed roller is disposed at an outlet portion of the furnace.

7. The device for correcting plate warpage of metal plates according to any one of claims 1 to 6, wherein,

8. The device for correcting plate warpage of metal plates according to any one of claims 1 to 7, wherein,

the leveling roller is disposed inside a furnace nose disposed between an outlet portion of a furnace for heat-treating the metal plate and the molten metal pot.

9. The device for correcting plate warpage of metal plates according to any one of claims 1 to 8, wherein,

the device for correcting sheet warpage in a metal sheet further comprises:

a plate warp measuring device provided on a downstream side in the conveying direction from the sink roll; and

and a controller configured to adjust an amount of press-fitting of the leveling roller to the metal plate side based on a measurement result of the plate warp measuring device.

10. A continuous plating treatment apparatus for a metal sheet, characterized in that,

the apparatus for continuous plating treatment of a metal plate is provided with the device for correcting plate warp according to any one of claims 1 to 9.