Method for controlling sheet passing speed of tandem rolling mill, method for manufacturing checkered steel sheet, control device, and tandem rolling equipment

Abstract

To provide a method for controlling the passing speed of a tandem rolling mill by which the deterioration in the accuracy of the width of a checkered steel sheet is suppressed.SOLUTION: The sheet passing speed control method includes a calculation step of calculating an added sheet thickness obtained by adding a sheet thickness increase due to streaks of a checkered steel sheet to a base material sheet thickness, a determination step of determining a roll peripheral speed of the finishing rolling stand by mass flow control using the added sheet thickness, and a control step of performing control such that a roll peripheral speed of the finishing rolling roll becomes the roll peripheral speed determined in the determination step.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a method for controlling the threading speed of a tandem rolling mill for rolling checkered steel plate, a method for manufacturing checkered steel plate, a control device, and tandem rolling equipment. [Background technology]

[0002] Checkered steel plate has a plurality of continuous rib shapes on the surface of the steel plate, and is manufactured by rolling the steel plate with patterned finishing rolls on a hot rolling line and winding it into a coil. As a technology for manufacturing checkered steel plate, Patent Document 1 discloses a hot rolling method for metal plate with a concave-convex pattern, in which the rear end of a preceding material sheet bar and the front end of a succeeding material sheet bar are joined, and the checkered steel plate is manufactured by cutting between the finishing rolling mill and the winding device.

[0003] Patent Document 2 discloses a speed compensation method for a tandem rolling mill that performs hot rolling of steel plates other than checkered steel plates, in which the method compensates for tension changes between two adjacent rolling stands using the base material thickness at the time of stand engagement and the stand forward slip ratio. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2002-137003 [Patent Document 2] Japanese Patent Application Publication No. 61-266111 Summary of the Invention [Problem to be solved by the invention]

[0005] When rolling steel plates other than checkered steel plates is applied to rolling checkered steel plates, the plate width accuracy of the checkered steel plates decreases due to the influence of plate thickness variations caused by the checker lines in the checkered steel plates. This results in products that are smaller than the target plate width required for checkered steel plates, resulting in a problem of reduced product yield.

[0006] The present invention has been made in consideration of the above problems of the prior art, and its object is to provide a method and a control device for controlling the threading speed of a checkered steel plate in a tandem rolling mill, which can suppress a decrease in the width accuracy of the checkered steel plate. Another object of the present invention is to provide a method and a tandem rolling mill, which can produce checkered steel plate while suppressing a decrease in the width accuracy. [Means for solving the problem]

[0007] The means for solving the above problems are as follows. [1] A method for controlling the plate threading speed of a tandem rolling mill having a rib stand equipped with grooved rolls for rolling checkered steel plate, and a finishing rolling stand equipped with finishing rolling rolls, which is provided upstream of the rib stand in the plate threading direction, and includes: a calculation step for calculating an added thickness by adding the thickness increase due to the checkering of the checkered steel plate to the base material thickness; a determination step for determining the roll peripheral speed of the finishing rolling stand by mass flow control using the added thickness; and a control step for controlling the roll peripheral speed of the finishing rolling rolls to become the roll peripheral speed determined in the determination step. [2] The method for controlling the plate threading speed of a tandem rolling mill according to [1], wherein in the calculation step, the increase in plate thickness is calculated by multiplying the base plate thickness by the ratio of the cross-sectional area of ​​the checkered pattern to the cross-sectional area of ​​the base plate. [3] The method for controlling the plate threading speed of a tandem rolling mill according to [2], wherein in the calculation step, the checkered cross-sectional area is calculated using the rib height of the checkered steel plate, the connection width of the rib, the peak width of the rib, the installation interval of the rib, and the width of the base plate. [4] A method for manufacturing checkered steel plate using a tandem rolling mill having a rib stand equipped with grooved rolls for rolling the checkered steel plate, and a finish rolling stand equipped with finishing rolls, which is provided upstream of the rib stand in the plate passing direction, and in which the roll peripheral speed of the finish rolling rolls is controlled to a roll peripheral speed determined by the plate passing speed control method for a tandem rolling mill described in any one of [1] to [3]. [5] A control device for controlling the plate passing speed of a tandem rolling mill having a rib stand equipped with grooved rolls for rolling checkered steel plate, and a finishing rolling stand equipped with finishing rolling rolls, which is located upstream of the rib stand in the plate passing direction, the control device comprising: a calculation unit for calculating an added thickness by adding the thickness increase due to the checkering of the checkered steel plate to the base material thickness; a determination unit for determining the roll peripheral speed of the finishing rolling stand by mass flow control using the added thickness; and a drive control unit for controlling a drive device that drives the finishing rolling rolls so that the roll peripheral speed of the finishing rolling rolls becomes the roll peripheral speed determined by the determination unit. [6] The control device described in [5], wherein the calculation unit calculates the increase in plate thickness by multiplying the ratio of the cross-sectional area of ​​the checkered pattern to the cross-sectional area of ​​the base material by the base material thickness. [7] The control device described in [6], wherein the calculation unit calculates the checkered cross-sectional area using the height of the rib of the checkered steel plate, the connection width of the rib, the peak width of the rib, the installation spacing of the rib, and the width of the base plate. [8] A tandem rolling facility comprising: a tandem rolling mill having a rib stand equipped with grooved rolls for rolling checkered steel plate; and a finishing rolling stand provided upstream of the rib stand in the plate passing direction and equipped with finishing rolling rolls; and a control device according to any one of [5] to [7]. [Effects of the Invention]

[0008] In the method for controlling the plate threading speed of a tandem rolling mill according to the present invention, the roll peripheral speed of the finishing rolling stand provided upstream of the rib stand in the plate threading direction is controlled taking into consideration thickness variations due to checker marks in the checker steel plate. This makes it possible to roll the checker steel plate with a small mass flow error between the finishing rolling stand and the rib stand, thereby suppressing a decrease in the plate width accuracy of the checker steel plate and thereby suppressing a decrease in product yield due to a decrease in plate width accuracy. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a schematic diagram showing an example of the configuration of a tandem rolling mill in which the method for controlling the strip threading speed of a tandem rolling mill according to this embodiment can be implemented. [Figure 2] FIG. 2 is a cross-sectional schematic diagram showing a checkered steel plate. [Figure 3] FIG. 3 is a cross-sectional schematic diagram showing the ribs of the checkered steel plate. [Figure 4] FIG. 4 is a schematic diagram showing an example of the configuration of the control device. [Figure 5] FIG. 5 is a graph showing the amount of reduction in width of the checkered steel plates produced in the inventive examples and the amount of reduction in width of the checkered steel plates produced in the comparative examples. DETAILED DESCRIPTION OF THE INVENTION

[0010] The present invention will be specifically described below through embodiments of the present invention. The following embodiments show preferred examples of the present invention, and the present invention is not limited to these embodiments. Figure 1 is a schematic diagram showing an example of the configuration of a tandem rolling mill 100 in which a method for controlling the strip threading speed of a tandem rolling mill according to this embodiment can be implemented.

[0011] The tandem rolling facility 100 is a facility that rolls a steel plate that has been rough-rolled to a predetermined thickness into a checkered steel plate. The tandem rolling facility 100 includes a tandem rolling mill 20 that rolls the steel plate into a checkered steel plate and a control device 30 that controls the plate threading speed of the tandem rolling mill 20. The tandem rolling mill 20 includes, for example, two finishing rolling stands 10 and 12, a rib stand 14, and two thickness gauges 22 and 24. The finishing rolling stands 10 and 12 are equipped with finishing rolls 11 and 13 and are rolling stands that perform finish rolling on the steel plate. On the other hand, the rib stand 14 is equipped with a grooved roll 15 and is a rolling stand that rolls the steel plate into a checkered steel plate.

[0012] The finishing rolling stands 10, 12 and the rib stand 14 each have a peripheral speed meter 16 and a motor 18. The peripheral speed meter 16 measures the peripheral speed of the finishing rolls 11, 13 or the grooved roll 15 and outputs the measured peripheral speed of each roll to the control device 30. The peripheral speed meter 16 is, for example, a non-contact optical tachometer. The motor 18 drives the finishing rolls 11, 13 or the grooved roll 15 to rotate. The motor 18 is an example of a drive device that drives the finishing rolls 11, 13 or the grooved roll 15.

[0013] Two thickness gauges 22, 24 are provided between the finish rolling stand 12 and the rib stand 14, and downstream of the rib stand 14, respectively. The thickness gauge 22 measures the thickness of the steel plate finish rolled in the finish rolling stand 12, and outputs the measured steel plate thickness to the control device 30. In addition, the thickness gauge 24 measures the rib shape and base material thickness of the checkered steel plate rolled in the rib stand 14, and outputs the measured rib shape and base material thickness to the control device 30.

[0014] The control device 30 controls the plate threading speed by controlling the roll peripheral speed of the finishing rolling stand 12, which is provided in the front stage on the upstream side in the plate threading direction of the rib stand 14 in the tandem rolling mill 20. In controlling the roll peripheral speed of the finishing rolling stand 12, the control device 30 calculates an added plate thickness by adding the plate thickness increase due to the checkering of the checkered steel plate to the base plate thickness. This is the calculation step in the plate threading speed control method for a tandem rolling mill.

[0015] The control device 30 determines the roll peripheral speed of the finish rolling rolls 13 of the finish rolling stand 12 by mass flow control using the added plate thickness. This is the determination step in the plate threading speed control method for the tandem rolling mill. The control device 30 controls the motor 18 of the finish rolling stand 12 so that the roll peripheral speed of the finish rolling rolls 13 becomes the determined roll peripheral speed. This is the control step in the plate threading speed control method for the tandem rolling mill 20.

[0016] Furthermore, the control device 30 controls the roll peripheral speed of the rib stand 14 and the roll peripheral speed of the finish rolling stand 10 so that the roll peripheral speed of the finish rolling stand 12 becomes the determined roll peripheral speed. In this way, the control device 30 controls the roll peripheral speed of each stand constituting the tandem rolling mill 20, thereby controlling the sheet threading speed of the tandem rolling mill 20.

[0017] Next, the checkered steel plate 40 rolled by the tandem rolling mill 20 will be described. Fig. 2 is a cross-sectional schematic diagram showing the checkered steel plate 40. Fig. 3 is a cross-sectional schematic diagram showing ribs 44 of the checkered steel plate 40. As shown in Figs. 2 and 3, the checkered steel plate 40 has a plurality of ribs 44 provided at predetermined intervals on the upper surface of the base steel plate 42. In this embodiment, the plurality of ribs 44 are referred to as "checkered patterns."

[0018] 2 and 3, the present embodiment will be described using a checkered steel plate 40 having a plurality of ribs 44 provided on the upper surface of a base steel plate 42 as the checkered steel plate 40 manufactured using the tandem rolling equipment 100. However, the checkered steel plate manufactured by the tandem rolling equipment 100 according to the present embodiment is not limited to this, and may be a checkered steel plate having ribs 44 provided on the lower surface of the base steel plate 42, or a checkered steel plate having a plurality of ribs 44 provided on the upper and lower surfaces of the base steel plate 42.

[0019] 2 and 3, an extra volume corresponding to the checkered portion is conveyed in the rib stand 14 that rolls the checkered steel plate 40. Therefore, if the roll peripheral speed of the finishing rolling stand 12 is determined by applying mass flow control for steel plate without checkered portions, an error occurs in the mass flow between the finishing rolling stand 12 and the rib stand 14. This mass flow error causes the steel plate between the finishing rolling stand 12 and the rib stand 14 to be pulled toward the rib stand 14, narrowing the base plate width of the checkered steel plate 40. As a result, the width accuracy of the produced checkered steel plate 40 decreases, and products are produced that are smaller than the target width required for the checkered steel plate 40, resulting in a decrease in product yield.

[0020] In contrast, in the method for controlling the plate threading speed of a tandem rolling mill according to this embodiment, the roll peripheral speed of the finishing rolling stand 12 is determined by mass flow control using an added thickness obtained by adding the increase in plate thickness due to the checker lines of the checker steel plate 40 to the base plate thickness. This makes it possible to roll the checker steel plate 40 while reducing the mass flow error between the finishing rolling stand 12 and the rib stand 14. As a result, deterioration in the plate width accuracy of the produced checker steel plate 40 is suppressed, and it is possible to suppress a decrease in product yield due to a decrease in plate width accuracy.

[0021] The increase in thickness due to the checkered lines in the checkered steel plate 40 is calculated by multiplying the base plate thickness by the ratio of the checkered line cross-sectional area to the base plate cross-sectional area. The checkered line cross-sectional area is the total cross-sectional area of ​​the ribs 44 in the width direction of the checkered steel plate 40, and is calculated using the rib 44 height 50, connection width 52, peak width 54, rib 44 installation interval 56, and base plate width 48 shown in FIG. 3. Specifically, the cross-sectional area of ​​the ribs 44 is calculated by adding or subtracting the area of ​​the chamfered portion 58 to the area of ​​the trapezoid calculated using the rib 44 height 50, connection width 52, and peak width 54. The number of ribs 44 is calculated by dividing the base plate width 48 of the checkered steel plate 40 by the rib 44 installation interval 56, and the checkered line cross-sectional area is calculated by multiplying this number by the cross-sectional area of ​​the ribs 44. The cross-sectional area of ​​the rib 44 may be determined by creating a 3D model of the checkered steel plate 40 using 3D CAD, creating a cross section of the rib 44 using the 3D model, and then determining the cross-sectional area of ​​the cross section.

[0022] Next, the control device 30 will be described. Fig. 4 is a schematic diagram showing an example configuration of the control device 30. The control device 30 is, for example, a general-purpose computer such as a workstation or a personal computer. The control device 30 has a control unit 60, an input unit 62, an output unit 64, and a storage unit 66. The control unit 60 is, for example, a CPU, and functions as a calculation unit 68, a determination unit 70, and a drive control unit 72 by executing a program stored in the storage unit 66.

[0023] The input unit 62 is, for example, a keyboard, a touch panel integrated with a display, or the like. The output unit 64 is, for example, an LCD or CRT display, or the like. The storage unit 66 is, for example, an updatable flash memory, a built-in hard disk or a hard disk connected via a data communication terminal, an information recording medium such as a memory card, and a read / write device for the same. The storage unit 66 has stored therein in advance programs, formulas, and data used to determine the roll peripheral speed of the finishing rolling stand 12 via the input unit 62.

[0024] Next, the processing executed by the calculation unit 68, the determination unit 70, and the drive control unit 72 will be described. The calculation unit 68 calculates an added thickness by adding the thickness increase due to the checkering of the checker steel plate 40 to the base material thickness. The calculation unit 68 calculates the added thickness (mm) using the following formula (1). When calculating the added thickness, the calculation unit 68 calculates the added thickness using target values ​​for the base material thickness 46 and the dimensions of the rib 44 before the production of the checker steel plate 40. Furthermore, during the production of the checker steel plate 40, the calculation unit 68 calculates the added thickness using the dimensions of the base material thickness 46 and the rib 44 measured by the thickness gauge 24. The calculation unit 68 outputs the calculated added thickness (mm) to the determination unit 70. Furthermore, the calculation unit 68 outputs the measured value of the thickness of the finishing rolling stand 12 obtained from the thickness gauge 22 to the determination unit 70.

[0025]

number

[0026] When the determination unit 70 acquires the added thickness from the calculation unit 68, it calculates the roll peripheral speed using the added thickness and the following equation (2) to determine the roll peripheral speed of the finishing rolling stand 12. In the following equation (2), t i+1 wr×(1.0+S′ / S) is the added plate thickness calculated by the above formula (1).

[0027]

number

[0028] Furthermore, the following equation (3) is an equation for calculating the roll peripheral speed of the finishing rolling stand 12 without considering the increase in plate thickness due to the checkering of the checkered steel plate 40. The following equation (3) is calculated using the mass flow control equation for the rib stand 14 and the calculation equation for the forward slip of the finishing rolling roll 13 and the grooved roll 15, assuming that the base plate thickness and plate threading speed on the outlet side of the finishing rolling stand 12 are equal to the base plate thickness and plate threading speed on the inlet side of the rib stand 14.

[0029]

number

[0030] As can be seen from the above equations (2) and (3), the control device 30 according to this embodiment determines the roll peripheral speed of the finishing rolling stand 12 using the added plate thickness calculated by the calculation unit 68 instead of the plate thickness of the rib stand 14. This increases the roll peripheral speed of the finishing rolling stand 12 by the amount of increase in plate thickness, thereby reducing the mass flow error between the finishing rolling stand 12 and the rib stand 14, and as a result, it becomes possible to suppress a decrease in the plate width accuracy of the checkered steel plate 40 produced.

[0031] The determination unit 70 outputs the determined roll peripheral speed of the finishing rolling stand 12 to the drive control unit 72. Note that the determination unit 70 may cause the output unit 64 to output the determined roll peripheral speed of the finishing rolling stand 12.

[0032] When the drive control unit 72 acquires the roll circumferential speed of the finish rolling stand 12 from the determination unit 70, it refers to a table created in advance that associates roll circumferential speeds with drive voltages, and applies a drive voltage corresponding to the determined roll circumferential speed to the motor 18 to drive the finish rolling rolls 13. In this way, the drive control unit 72 controls the roll circumferential speed of the finish rolling rolls 13. The drive control unit 72 may also control the roll circumferential speed of the finish rolling rolls 13 by controlling the drive voltage of the motor 18 so that the circumferential speed measured by the circumferential speed meter 16 becomes the determined roll circumferential speed.

[0033] The drive control unit 72 also controls the roll peripheral speed of the rib stand 14 so that it becomes a target value of the roll peripheral speed determined from the productivity of the checkered steel plate 40. Furthermore, the drive control unit 72 controls the roll peripheral speed of the finishing rolling stand 10 so that it corresponds to the roll peripheral speed of the finishing rolling stand 12. Specifically, the drive control unit 72 calculates the roll peripheral speed of the finishing rolling stand 10 by mass flow control using the roll peripheral speed of the finishing rolling stand 12 and the base material thickness, and controls the roll peripheral speed of the finishing rolling stand 10 so that it becomes the calculated roll peripheral speed.

[0034] In this way, the control device 30 determines the roll peripheral speed of the finishing rolling stand 12 using an added thickness obtained by adding the increase in thickness due to checker marks to the base material thickness. Then, the roll peripheral speed of each stand in the tandem rolling mill 20 is controlled to achieve the determined roll peripheral speed of the finishing rolling stand 12, thereby producing the checkered steel plate 40. This makes it possible to roll the checkered steel plate 40 with a small mass flow error between the finishing rolling stand 12 and the rib stand 14, thereby suppressing a decrease in the plate width accuracy of the produced checkered steel plate 40 and making it possible to suppress a decrease in product yield due to a decrease in plate width accuracy.

[0035] Also, by reducing the mass flow error between the finish rolling stand 12 and the rib stand 14, it becomes possible to suppress the occurrence of scratches caused by the finish rolling rolls 13 and the grooved rolls 15. Furthermore, it is possible to suppress the tension of the steel plate between the finish rolling stand 12 and the rib stand 14 from becoming excessive, which makes it possible to suppress an increase in the load on the equipment.

[0036] In the above embodiment, an example has been shown in which a tandem rolling mill 20 having two finishing rolling stands 10, 12 and a rib stand 14 is used, but the present invention is not limited to this. The tandem rolling mill 20 in which the plate threading speed is controlled by the method for controlling the plate threading speed of a tandem rolling mill according to this embodiment may have at least the rib stand 14 for rolling checkered steel plate and a finish rolling stand 12 provided in front of the rib stand 14 on the upstream side in the plate threading direction. Furthermore, a plurality of finish rolling stands may be provided upstream of the finish rolling stand 12 in the plate threading direction, and one or more finish rolling stands may be provided downstream of the rib stand 14 in the plate threading direction.

[0037] In the above embodiment, an example was shown in which the tandem rolling mill 20 had thickness gauges 22, 24, but this is not limited to this. The tandem rolling mill 20 does not have to have the thickness gauge 22 as long as it has the thickness gauge 24. In this case, the control device 30 uses the calculated value of the plate thickness of the finishing rolling stand 12 calculated using the measurement value measured by the thickness gauge 24. [Example]

[0038] Next, an example will be described in which a checkered steel plate with a target width of 1474 mm was manufactured using the tandem rolling equipment 100 shown in Figure 1. In the method for controlling the plate threading speed of a tandem rolling mill of the invention, the roll peripheral speed was determined taking into account the increase in plate thickness due to checker marks, and the plate threading speed of the tandem rolling mill 20 was controlled to manufacture the checkered steel plate. On the other hand, in the method for controlling the plate threading speed of a tandem rolling mill of the comparative example, the roll peripheral speed was determined without taking into account the increase in plate thickness due to checker marks, and the plate threading speed of the tandem rolling mill 20 was controlled to manufacture the checkered steel plate. The manufacturing conditions for the checkered steel plate manufactured in this example (invention example and comparative example) are as follows.

[0039] The roll peripheral speed of the rib stand 14 (F i+1 Target value for wr: 200mpm Rib stand 14 advance rate (F i+1 fs) setting: 5% (use 0.05 for calculation) Base plate thickness of rib stand 14 (t i+1 Target value of wr: 9.3 mm Advance rate (F) of finishing rolling stand 12 i fs) setting: 7% (use 0.07 for calculation) The base material thickness (t i wr) setting value: 18.0 mm Cross-sectional area of ​​grain (S') / cross-sectional area of ​​base material (S): 0.16

[0040] When the roll peripheral speed of the finishing rolling stand 12 was calculated using the above manufacturing conditions and the above formula (2), the roll peripheral speed of the finishing rolling stand 12 was found to be 118 mpm. Therefore, in the example of the invention, the roll peripheral speed of the finishing rolling stand 12 was controlled to 118 mpm by the control device 30, and checkered steel plate was manufactured.

[0041] When the roll peripheral speed of the finish rolling stand 12 was calculated using the above manufacturing conditions and the above formula (3), the roll peripheral speed of the finish rolling stand 12 was found to be 101 mpm. Therefore, in the comparative example, the roll peripheral speed of the finish rolling stand 12 was controlled to 101 mpm by the control device 30 to manufacture checkered steel plate.

[0042] Figure 5 is a graph showing the width reduction of the checkered steel plate produced in the inventive example and the comparative example. As shown in Figure 5, the difference in width between the minimum width portion and the steady portion of the produced checkered steel plate in the inventive example was 3.8 mm. On the other hand, the difference in width between the minimum width portion and the steady portion of the produced checkered steel plate in the comparative example was 25.0 mm.

[0043] Since a large difference between the minimum width portion and the steady width portion means that the width accuracy in the production of checkered steel plates is low, it has been confirmed that by implementing the method for controlling the plate threading speed of a tandem rolling mill according to this embodiment, it is possible to significantly suppress the deterioration of the width accuracy of checkered steel plates. In other words, it has been confirmed that by determining the roll peripheral speed of the finishing rolling stand using an added thickness obtained by adding the thickness increase due to checkering to the base material thickness in mass flow control, it is possible to significantly suppress the deterioration of the width accuracy of the produced checkered steel plates. [Explanation of symbols]

[0044] 10, 12 Finishing rolling stands 11, 13 Finishing roll 14 Rib Stand 15 Grooved roll 16 Circumferential speed meter 18 Motor 20 Tandem Rolling Mill 22, 24 Thickness gauge 30 Control device 40 Checkered steel plate 42 Base material steel plate 44 Ribs 46 Base material thickness 48 Base plate width 50 height 52 Connection width 54 Peak Width 56 Installation interval 58 Chamfer 60 Control Unit 62 Input section 64 Output section 66 Storage area 68 Calculation Unit 70 Decision Section 72 Drive control unit 100 Tandem Rolling Equipment

Claims

1. A method for controlling a plate threading speed of a tandem rolling mill having a rib stand equipped with grooved rolls for rolling checkered steel plate, and a finish rolling stand provided upstream of the rib stand in the plate threading direction and equipped with finish rolling rolls, comprising: A calculation step of calculating an added thickness by adding an increase in thickness due to the checkered pattern of the checkered steel plate to the base material thickness; a determining step of determining a roll peripheral speed of the finishing rolling stand by mass flow control using the added plate thickness; a control step of controlling the roll peripheral speed of the finish rolling roll to the roll peripheral speed determined in the determination step; A method for controlling the threading speed of a plate in a tandem rolling mill, comprising:

2. 2. The method for controlling a plate threading speed in a tandem rolling mill according to claim 1, wherein in the calculation step, the plate thickness increase is calculated by multiplying the base plate thickness by a ratio of a checkered cross-sectional area to a base plate cross-sectional area.

3. 3. The plate threading speed control method for a tandem rolling mill according to claim 2, wherein in the calculation step, the checkered cross-sectional area is calculated using a rib height of the checkered steel plate, a connection width of the rib, a peak width of the rib, an installation interval of the rib, and a width of the base plate.

4. A method for producing a checkered steel plate using a tandem rolling mill having a rib stand equipped with a grooved roll for rolling the checkered steel plate, and a finish rolling stand provided upstream of the rib stand in the plate passing direction and equipped with a finish rolling roll, A method for producing checkered steel plate, comprising controlling the roll peripheral speed of the finish rolling rolls to a roll peripheral speed determined by the method for controlling the plate threading speed in a tandem rolling mill according to any one of claims 1 to 3.

5. A control device for controlling a plate threading speed of a tandem rolling mill having a rib stand equipped with grooved rolls for rolling checkered steel plate, and a finish rolling stand provided upstream of the rib stand in the plate threading direction and equipped with finish rolling rolls, A calculation unit that calculates an added thickness by adding an increase in thickness due to the checkered lines of the checkered steel plate to the base material plate thickness; a determination unit that determines a roll peripheral speed of the finishing rolling stand by mass flow control using the added plate thickness; a drive control unit that controls a drive device that drives the finish rolling rolls so that the roll peripheral speed of the finish rolling rolls becomes the roll peripheral speed determined by the determination unit; A control device having:

6. The control device according to claim 5, wherein the calculation unit calculates the thickness increase by multiplying the base material thickness by a ratio of a checkered cross-sectional area to a base material cross-sectional area.

7. The control device according to claim 6, wherein the calculation unit calculates the checkered cross-sectional area using the height of the ribs of the checkered steel plate, the connection width of the ribs, the peak width of the ribs, the installation interval of the ribs, and the width of the base plate.

8. a tandem rolling mill including a rib stand equipped with grooved rolls for rolling checkered steel plate, and a finish rolling stand provided upstream of the rib stand in the plate passing direction and equipped with finish rolling rolls; The control device according to any one of claims 5 to 7; Tandem rolling equipment.

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