JP7119130B2 - Control device for rolling mill, rolling equipment, and method for operating rolling mill - Google Patents

Description

TECHNICAL FIELD The present disclosure relates to a rolling mill control device, rolling equipment, and a rolling mill operating method.

In a rolling mill (reverse mill) that reciprocates and rolls a metal plate passed between a pair of rolling rolls, the metal plate is usually placed in an unwinding device and a winding device provided on both sides of the rolling rolls in the traveling direction of the metal plate. In the state where the metal sheet is wrapped around the metal sheet, the rolling rolls are rolled down and rotated, and rolling is performed while tension is applied to the metal sheet by an unwinding device and a winding device. In such a rolling mill, it is necessary to wind the leading edge of the metal plate around the winding device at the start of rolling. Therefore, the portion of the metal plate that is closer to the winding device than the rolling rolls at the start of rolling cannot be rolled, and this portion cannot be used as a product.

Therefore, a configuration for improving the yield of metal plates has been proposed. For example, in Patent Literature 1, a leader piece (lead material) is welded to the tip of a metal plate, and the leader piece is wound up by a winding device, thereby applying tension to the metal plate on the delivery side via the leader piece. It is described that rolling is started while By starting rolling with the leader piece joined in this manner, rolling is performed from a position closer to the tip side of the metal plate, thereby improving the yield.

Japanese Patent No. 4508949

However, when a lead material is used as in Patent Literature 1, it is necessary to perform a joining operation for each rolled metal plate, which is laborious and costly, and also requires a joining device.
Therefore, it is desired to improve the yield with a simpler configuration.

In view of the circumstances described above, it is an object of at least one embodiment of the present invention to provide a rolling mill control device, a rolling mill, and a rolling mill operation method that can improve the yield of metal sheets with a simple configuration. do.

(1) A control device for a rolling mill according to at least one embodiment of the present invention,
a pair of rolling rolls provided so as to sandwich a metal sheet; and an unwinding device for unrolling the metal sheet on the entry side of the rolling rolls in the direction in which the metal sheet advances. A control device for controlling a rolling mill configured to roll with a pair of rolling rolls,
After the leading end of the metal plate is passed between the pair of rolls in a state in which the gap between the pair of rolls is larger than the thickness of the metal plate, the delivery side tension applied to the metal plate is zero. state, the metal sheet is rolled down by the pair of rolling rolls, the entry-side tension applied to the metal sheet by the unwinding device is made greater than zero, and the pair of rolling rolls is configured to start rotating. .

According to at least one embodiment of the present invention, there is provided a control device for a rolling mill, a rolling mill, and a method for operating the rolling mill that are capable of improving the yield of metal sheets with a simple configuration.

1 is a schematic configuration diagram of a rolling facility equipped with a control device according to one embodiment; FIG. 4 is a flowchart showing processing by a control device according to one embodiment; FIG. 4 is a schematic diagram showing the state of the rolling rolls and the metal plate at the start of rolling. FIG. 4 is a schematic diagram showing the state of the rolling rolls and the metal plate at the start of rolling. FIG. 4 is a schematic diagram showing the state of the rolling rolls and the metal plate at the start of rolling. FIG. 4 is a diagram showing changes over time in the roll speed Vm of the rolling rolls and the entry-side tension Te applied to the metal plate at the start of rolling. 4 is a flowchart showing part of processing by a control device according to an embodiment; 4 is a flowchart showing part of processing by a control device according to an embodiment;

Several embodiments of the present invention will now be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of the components described as embodiments or shown in the drawings are not intended to limit the scope of the present invention, and are merely illustrative examples. do not have.

First, the overall configuration of a rolling facility including rolling mills according to some embodiments will be described.
FIG. 1 is a schematic configuration diagram of a rolling facility equipped with a control device according to one embodiment. As shown in FIG. 1 , the rolling mill 1 includes a rolling mill 2 and a control device 30 for controlling the rolling mill 2 .

The rolling mill 2 shown in FIG. 1 is a rolling mill (reverse mill) that reciprocates and rolls a metal plate 50 passed between a pair of rolling rolls 16A and 16B. The rolling mill 2 includes a rolling mill 10 including a pair of rolling rolls (work rolls) 16A and 16B provided so as to sandwich a metal plate 50, which is a rolling material, and the rolling rolls 16A and 16B in the traveling direction of the metal plate 50. It includes an unwinding device 4 provided on the entry side and a winding device 14 provided on the exit side of the rolling rolls 16A and 16B in the traveling direction of the metal plate 50. It is configured to be rolled by

In addition to a pair of rolling rolls (work rolls) 16A and 16B, the rolling mill 10 includes a pair of intermediate rolls 18A and 18B provided on opposite sides of the metal plate 50 with the pair of rolling rolls 16A and 16B interposed therebetween. A pair of backup rolls 20A, 20B are included. Intermediate rolls 18A, 18B and backup rolls 20A, 20B are configured to support mill rolls 16A, 16B. The rolling mill 10 also includes a screw down device 22 for applying a load to the pair of rolling rolls 16A and 16B to roll down the metal plate 50 sandwiched between the pair of outer rolling rolls 16A and 16B. The screw down device 22 may include a hydraulic cylinder.

A motor 11 is connected to the rolling rolls 16A and 16B via a spindle or the like (not shown), and the rolling rolls 16A and 16B are rotationally driven by the motor 11. As shown in FIG. When the metal plate 50 is rolled, the rolls 16A and 16B are rotated by the motor 11 while the rolls 16A and 16B are rotated by the roll-down device 22, thereby generating a frictional force between the rolls 16A and 16B and the metal plate 50. This frictional force feeds the metal plate 50 to the delivery side of the rolling rolls 16A and 16B.

The unwinding device 4 is configured to unwind the metal sheet 50 toward the rolling mill 10 . The winding device 14 is configured to wind the metal sheet 50 from the rolling mill 10 . The unwinding device 4 and the winding device 14 are driven by motors 5 and 15, respectively.

The unwinding device 4 is configured to apply entry-side tension to the metal plate 50 when the metal plate 50 is rolled. Further, the winding device 14 is configured to apply a delivery-side tension to the metal plate 50 when the metal plate 50 is rolled. That is, by appropriately driving the unwinding device 4 and the winding device 14 by the motors 5 and 15, the metal plate 50 is provided with tension on the entry side and tension on the exit side. Meandering of the metal plate 50 during rolling can be suppressed by appropriately applying an entry-side tension and an exit-side tension to the metal plate 50 .

The rolling is stopped just before the tail end of the metal plate 50 unwound from the unwinding device 4, and when the rolling is completed while the metal plate 50 is rolled down by the rolling rolls 16A and 16B, the winding device 14 is rolled. While the metal sheet 50 is unwound from the rolling mill 10 toward the rolling mill 10, the metal sheet 50 is advanced in the direction opposite to the previous direction while being wound up by the unwinding device 4 to be rolled. That is, the role of the unwinding device 4 and the role of the winding device 14 are exchanged according to the traveling direction of the metal plate 50 .

The rolling mill 2 includes entry-side pinch rolls 6 and side guides 8 for guiding the metal plate 50 introduced into the rolling mill 10 from the unwinding device 4, and the metal plate 50 sent from the rolling mill 10 to the winding device 14. and an exit pinch roll 12 for guiding the .

In addition, the rolling mill 2 is provided with various measuring instruments. The rolling mill 2 shown in FIG. 1 includes speed sensors 32 and 36 for measuring the speeds of the motors 5 and 11, respectively, a tension sensor 34 for measuring entry-side tension acting on the metal plate 50, rolling rolls 16A, A roll-down position sensor 37 for detecting the roll-down position of 16B, a plate end position detector 38 for measuring the position of the width direction end of the metal plate 50 on the delivery side of the rolling rolls 16A and 16B, and A speed sensor 40 or the like is provided for measuring the speed of the metal plate 50 on the delivery side of the rolling rolls 16A and 16B. Signals indicating measurement results by these measuring instruments are sent to the control device 30 . Instead of the tension sensor 34 for measuring the tension on the entry side, an ammeter for measuring the current of the motor 5 that drives the unwinding device 4 is provided, and the tension on the entry side is calculated based on the measurement result of the ammeter. You may make it

The control device 30 receives signals indicating measurement results from the various measuring instruments described above, and based on these measurement results, the motor 11 for driving the rolling rolls 16A and 16B and the motor for driving the unwinding device 4 5 and/or the operation of the screw down device 22 or the like.

The control device 30 may include a CPU, a memory (RAM), an auxiliary storage section, an interface, and the like. The control device 30 receives signals from the various measuring instruments described above via an interface. The CPU is configured to process the signals received in this manner. Also, the CPU is configured to process a program expanded in the memory.

The processing contents of the control device 30 may be implemented as a program executed by the CPU and stored in the auxiliary storage unit. During program execution, these programs are expanded in memory. The CPU reads a program from memory and executes instructions contained in the program.

Next, control of the rolling mill 2 by the controller 30 described above will be described. The control of the rolling device 2 described below is the control when starting the rolling of the metal plate 50 wound on the unwinding device 4 . Note that the rolling mill 2 may be operated by manually performing part or all of the processing by the control device 30 described below.

FIG. 2 is a flowchart showing processing by the control device 30 according to one embodiment. 3 to 5 are schematic diagrams showing the states of the rolling rolls 16A and 16B and the metal plate 50 when rolling of the metal plate 50 is started under the control of the control device 30, respectively. FIG. 6 shows changes over time in the speed (peripheral speed) Vm of the rolling rolls 16A and 16B and the entry-side tension Te applied to the metal plate 50 when the metal plate 50 starts rolling under the control of the control device 30. It is a figure which shows.

In one embodiment, as shown in FIG. 2, the control device 30 first sets the pair of rolling rolls 16A and 16B so that the gap (roll-to-roll gap) between the pair of rolling rolls 16A and 16B is larger than the plate thickness of the metal plate 50. The positions of the rolling rolls 16A and 16B are adjusted (step S102). At this time, the screw down device 22 may be operated as necessary to adjust the positions of the pair of rolling rolls 16A and 16B. Then, while maintaining the gap between the rolls larger than the plate thickness, the tip portion 51 (see FIG. 3) of the metal plate 50 is passed between the pair of rolling rolls 16A and 16B (step S104).

FIG. 3 is a schematic diagram showing the states of the rolling rolls 16A and 16B and the metal plate 50 when step S104 is completed. As shown in FIG. 3, at the completion of step S104, the gap d0 between the pair of rolling rolls 16A and 16B is larger than the thickness H0 of the metal plate 50 before rolling, and the tip portion 51 of the metal plate 50 is is passed between the rolling rolls 16A and 16B. Further, the tip portion 51 of the metal plate 50 is located on the delivery side of the rolling rolls 16A and 16B and does not reach the winding device 14. As shown in FIG. Therefore, the delivery side tension Td acting on the metal plate 50 is zero. At this point, the entry-side tension Te is not applied to the metal plate 50, so the entry-side tension Te is also zero.

Next, the metal plate 50 is rolled down by the pair of rolling rolls 16A and 16B while the delivery side tension Td applied to the metal plate 50 is zero (step S106, time t0 in FIG. 6). In step S106, the screw-down device 22 is operated based on the measurement result of the screw-down position sensor 37 so that the gap between rolls becomes a value suitable for rolling. FIG. 4 is a schematic diagram showing the state of the rolling rolls 16A and 16B and the metal plate 50 when step S108 is completed. As shown in FIG. 4, the inter-roll gap d1 at the completion of step S108 is smaller than the plate thickness H0 of the metal plate 50 before rolling.

Then, the entry-side tension Te applied to the metal plate 50 by the unwinding device 4 is made greater than zero (step S108, time t1 in FIG. 6), and rolling is started by starting the rotation of the pair of rolling rolls 16A and 16B. (step S110, time t2 in FIG. 6). Note that, in steps S108 and S110, the exit side tension Td is maintained at zero.

In step S108, by appropriately adjusting the current value of the motor 5 for driving the unwinding device 4, the entry-side tension Te acting on the metal plate 50 is made larger than zero. Here, as shown in FIG. 6, the entry-side tension Te is set to a specified value Te1 larger than zero, and is kept at a constant value until the entry-side tension Te starts to increase in step S114 (time t3 in FIG. 6), which will be described later. may be maintained.

In step S109, the rolling rolls 16A and 16B are started to rotate by appropriately adjusting the current value of the motor 11 for driving the rolling rolls 16A and 16B. Note that when rolling is started in step S110, the metal plate 50 advances in the direction of the arrow shown in FIG.

FIG. 5 is a schematic diagram showing the state of the rolling rolls 16A and 16B and the metal plate 50 when rolling is started in step S110. As shown in FIG. 5, the portion of the metal plate 50 that has been rolled down by the rolling rolls 16A and 16B and advanced to the delivery side of the rolling rolls 16A and 16B has a plate thickness H1 that is thinner than the plate thickness H0 before rolling. is doing.

As described above, according to the above-described embodiment, after the leading end portion 51 of the metal plate 50 is passed between the pair of rolling rolls 16A and 16B, the delivery side tension Td applied to the metal plate 50 is zero. Then, the pair of rolling rolls 16A and 16B roll down the metal plate 50, and the rolling rolls 16A and 16B are started to rotate while applying an entry-side tension Te greater than zero to the metal plate 50 to start rolling the metal plate 50. Therefore, although the delivery-side tension Td is zero, rolling can be performed appropriately while suppressing the meandering of the metal plate 50 . Therefore, rolling can be started from a portion near the tip of the metal plate 50 without using a lead material or the like as described in Patent Document 1, and the yield of the metal plate 50 can be improved with a simple configuration. be able to.

The continuation of the flow of FIG. 2 will be described.
After starting rolling by starting rotation of the rolling rolls 16A and 16B in step S110, the speed of the rolling rolls 16A and 16B (roll speed Vm) is increased (step S112, times t2 to t4 in FIG. 6). After time t2, the entry-side tension Te applied to the metal plate 50 is increased (step S114, time t3 in FIG. 6), and the entry-side tension Te is adjusted so that the entry-side tension Te does not exceed the specified range ( Step S116, times t3 to t5 in FIG. 6).
In step S112, the speed of the rolling rolls 16A and 16B (roll speed Vm) is increased by appropriately adjusting the current value of the motor 11 for driving the rolling rolls 16A and 16B. In steps S114 and S116, the entry-side tension Te acting on the metal plate 50 is increased within a specified range by appropriately adjusting the current value of the motor 5 for driving the unwinding device 4 .

As described above, by applying the entry-side tension Te to the metal plate 50, rolling can be performed while suppressing meandering of the metal plate 50 even when the exit-side tension Td is zero. If the entry-side tension Te of 50 is excessive, the metal plate 50 tends to fail to advance to the exit side of the rolling rolls 16A and 16B (i.e. slippage tends to occur), and appropriate rolling may not be possible. .
In this regard, as described above, by increasing the entry-side tension Te applied to the metal plate 50 (step S114) and adjusting it within an appropriate range that does not cause slippage (step S116), the exit-side tension Te is reduced. Meandering of the metal plate 50 can be suppressed more effectively during rolling in the state of , and rolling can be performed more appropriately.

Further, if the entry-side tension Te is increased while the roll speed Vm is low, the relative speed of the metal plate 50 with respect to the roll speed Vm will be reduced, so that the metal plate 50 will not move between the rolling rolls 16A and 16B. An event that does not advance to the exit side may be likely to occur. In this regard, as described above, after the roll speed Vm is increased to some extent in step S112 (for example, when the roll speed Vm1 is increased to 40% or more and 60% or less of the target roll speed Vm2 (see FIG. 6)), step By increasing the entry-side tension Te in S114 to S116, the entry-side tension Te can be stably increased.

Step S116 for adjusting the entry-side tension Te so as not to exceed the specified range is repeatedly executed until the leading edge of the metal plate 50 reaches the winding device 14 (No in step S118). On the other hand, when the tension Td on the delivery side becomes greater than zero (Yes in step S118; that is, when the metal plate 50 starts to be wound by the winding device 14), the flow shown in FIG. Flow for properly performing rolling) is stopped, and normal control is performed when the delivery side tension Td is greater than zero.

Next, the processing in step S116 described above will be described more specifically. As described above, in step S116, the entry side tension Te is adjusted so as not to exceed the specified range.

In some embodiments, in step S116, the entry-side tension Te is adjusted so that the delivery-side speed Vd of the metal plate 50 is equal to or higher than the roll speed (rotational speed) Vm of the rolling rolls 16A and 16B. In this case, the controller 30 adjusts the entry-side tension Te within an appropriate range based on the delivery-side speed Vd measured by the speed sensor 40 and the roll speed Vm calculated from the speed of the motor 11 measured by the speed sensor 36. The current value of the motor 5 is appropriately adjusted so that

The fact that the delivery side speed Vd of the metal plate 50 is less than the rotational speed Vm of the rolling rolls 16A and 16B means that the metal plate 50 is not moving forward with respect to the rolling rolls 16A and 16B on the delivery side of the rolling rolls 16A and 16B. (That is, the metal plate 50 is starting to slip or is about to slip with respect to the rolling rolls 16A and 16B.) In this case, rolling may not be performed properly. In this respect, in the above-described embodiment, the entry-side tension Te applied to the metal plate 50 is adjusted so that the delivery-side speed Vd of the metal plate 50 is equal to or higher than the roll speed (rotational speed) Vm of the rolling rolls 16A and 16B. Therefore, it is possible to roll the metal plate 50 appropriately while suppressing the slippage of the metal plate 50 with respect to the rolling rolls 16A and 16B in a state of no tension on the delivery side.
Further, the rotation speed Vm of the rolling rolls 16A and 16B is measured a specified number of times for each specified period, and the delivery side speed Vd of the metal plate 50 is determined by using the measurement results of all or part of the specified number of times. The entry-side tension Te applied to the metal plate 50 may be adjusted so that the speed (rotational speed) Vm or higher.

In some embodiments, in step S116, the delivery side speed Vd of the metal plate 50 measured multiple times for each prescribed period is acquired, and the entry side tension Te is calculated based on the measurement results of the delivery side speed Vd over multiple times. Adjust.

The delivery side speed Vd of the metal plate 50 can be an index of whether or not the metal plate 50 slips on the rolling rolls 16A and 16B. In this regard, in the above-described embodiment, the delivery speed Vd of the metal plate 50 is measured a plurality of times at regular intervals, so that changes in the delivery speed Vd over time can be grasped. Therefore, by adjusting the entry-side tension Te applied to the metal plate 50 based on the results of measuring the delivery-side speed Vd over a plurality of times, the metal plate 50 can be prevented from slipping on the rolling rolls 16A and 16B with no tension on the delivery side. Rolling can be performed appropriately while suppressing it appropriately.

In some embodiments, when it is detected that the metal plate 50 is not advancing to the delivery side of the rolling rolls 16A and 16B while the delivery side tension Td applied to the metal plate 50 is zero, the entry side tension Te is increased. Stop.

The fact that the metal plate 50 has not advanced to the delivery side of the rolling rolls 16A and 16B means that the metal plate 50 is starting to slip with respect to the rolling rolls 16A and 16B, or there is a possibility that it will slip in the near future. omen). In this respect, according to the above-described embodiment, when it is detected that the metal plate 50 has not advanced to the delivery side of the rolling rolls 16A and 16B, the increase in the entry side tension Te is stopped. In this state, it is possible to roll the metal plate 50 properly while suppressing the slip of the metal plate 50 with respect to the rolling rolls 16A and 16B more reliably.
Furthermore, the advance of the metal plate 50 is measured a specified number of times for each specified period, and it is detected that the metal plate 50 has not advanced to the delivery side of the rolling rolls 16A and 16B in the measurement results of all or part of the specified times. You may do so.

The fact that the metal plate 50 has not advanced to the delivery side of the rolling rolls 16A and 16B may be detected by monitoring the metal plate 50 in the vicinity of the rolling rolls 16A and 16B using a camera, for example.

Alternatively, the fact that the metal plate 50 has not advanced to the delivery side of the rolling rolls 16A and 16B may be detected, for example, by using the delivery side speed Vd measured a specified number of times for each specified period.

In one embodiment, step S116 acquires the delivery speed Vd measured a specified number of times in each specified period, and the delivery speed Vd i measured for the i-th time and the delivery speed Vd _i measured for the (i−1)th time When the difference from the delivery side speed Vd _(i−1) is all negative, it is assumed that the metal plate 50 has not advanced to the delivery side of the rolling rolls 16A and 16B, and the increase in the entry side tension Te is stopped. It may be.

FIG. 7 is a flow chart of step S116 according to this embodiment.
In steps S202 to S208 of the flowchart shown in FIG. 7, αi=(Vd _i −Vd _(i-1) )/ΔT is calculated (i.e., the difference between the i-th measured delivery speed Vd _i and the (i-1)-th measured delivery speed Vd _(i-1) is calculated). Then, it is determined whether αi<0 (that is, whether (Vd _i −Vd _(i−1) )<0) for all i=1, 2, 3 (step S210). .

For all i=1, 2, 3, if αi<0 (that is, if at least one αi is greater than or equal to zero) (No in step S210), instead of decreasing the exit speed Vd, Since the tension sometimes increases, it is judged that the possibility of slippage is low, so the entry side tension Te is continued to be increased (step S216). On the other hand, if αi<0 for all i=1, 2, and 3 (Yes in step S210), the delivery side speed Vd is gradually decreasing, and there is a possibility that the metal plate 50 will slip. Since it is determined to be high, the increase in the entry-side tension Te is stopped (step S212). Further, when the increase in the entry-side tension Te is stopped in this way, the entry-side tension Te is decreased by a specified amount (step S214).

In one embodiment, the step S116 obtains the delivery speed Vd measured a specified number of times in each specified period, and obtains the delivery speed Vd measured at the i-th time and the delivery speed Vd _i measured at the (i-1)th time. If the integrated value of the difference from the calculated delivery side speed Vd _(i-1) is less than the specified value, it is considered that the metal plate 50 has not advanced to the delivery side of the rolling rolls 16A and 16B, and the entry side tension Te You may come to stop an increase.

FIG. 8 is a flow chart of step S116 according to this embodiment.
In steps S222 to S228 of the flowchart shown in FIG. 8, ΣΔVi=Σ(Vd _i − Vd _(i−1) ) (Integral value of the difference between the i-th measured delivery speed Vd _i and the (i−1)-th measured delivery speed Vd _(i−1) ) is calculated. be. Then, it is determined whether or not ΣΔVi is smaller than a specified value C (where C is a negative number) (step S230).

If ΣΔVi is equal to or greater than the above specified value C (No in step S230), it is determined that the delivery side speed Vd is not decreasing and slippage is unlikely to occur. Continue (step S236). On the other hand, when ΣΔVi is less than the above-described specified value C (Yes in step S230), it is determined that the delivery side speed Vd tends to decrease, and it is highly likely that the metal plate 50 will slip. The increase in the side tension Te is stopped (step S232). Further, when the increase in the entry-side tension Te is stopped in this way, the entry-side tension Te is decreased by a specified amount (step S234).

In this way, the difference between the i-th measured delivery speed Vd _i and the (i-1)-th measured delivery speed Vd _(i-1) , or the i-th measured delivery speed Based on the integrated value of the difference between Vd _i and the (i−1)-th measured output speed Vd _(i−1) , the possibility of slip occurring in the near future can be known, and the possibility is high, the increase in the tension Te on the entry side is stopped, so that the metal plate 50 is properly rolled while the slip of the metal plate 50 on the rolling rolls 16A and 16B is more reliably suppressed with no tension on the delivery side. be able to.

In the embodiment shown in FIGS. 7 and 8, the delivery side speed Vd measured a specified number of times in each specified period is used to control the adjustment of the entry side tension Te. In a form, the control related to the adjustment of the entry-side tension Te may be performed using the delivery-side speed Vd measured for each specified period for a specified length of time.

In some embodiments, the delivery side speed Vd of the metal plate 50 and the roll speed Vm, which is the peripheral speed of the rolling rolls 16A and 16B, are obtained, and the difference between the delivery side speed Vd of the metal plate 50 and the roll speed Vm (Vd -Vm) to adjust the entry side tension Te.

The difference (Vd−Vm) between the delivery speed Vd of the metal plate 50 and the roll speed Vm can be an index of whether or not the metal plate 50 slips on the rolling rolls 16A and 16B. In this regard, in the above-described embodiment, by adjusting the entry-side tension Te applied to the metal plate 50 based on the difference (Vd−Vm) between the exit-side speed Vd of the metal plate 50 and the roll speed Vm, Rolling can be properly performed while the slip of the metal plate 50 on the rolling rolls 16A and 16B is appropriately suppressed in the state of tension.

In some embodiments, after stopping the increase in the entry side tension Te (for example, after step S116 in FIG. 2 or steps S212 and S232 in FIGS. 7 and 8), the entry side tension Te is decreased by a specified amount. It may be configured as
For example, in the flowcharts shown in FIGS. 7 and 8, after stopping the increase in the entry-side tension Te in steps S212 and S232, the entry-side tension Te is reduced by a specified amount (steps S214 and S234).
In this way, after stopping the increase in the entry-side tension Te in order to suppress the slip, the entry-side tension Te is reduced by a specified amount, so that the rolling roll of the metal plate 50 is in a state of no tension on the delivery side. Rolling can be performed appropriately while further reliably suppressing slips on 16A and 16B.

Hereinafter, an outline of a rolling mill control device, a rolling equipment, and a method of operating a rolling mill according to some embodiments will be described.

(1) A control device for a rolling mill according to at least one embodiment of the present invention,
a pair of rolling rolls provided so as to sandwich a metal sheet; and an unwinding device for unrolling the metal sheet on the entry side of the rolling rolls in the direction in which the metal sheet advances. A control device for controlling a rolling mill configured to roll with a pair of rolling rolls,
After the leading end of the metal plate is passed between the pair of rolls in a state in which the gap between the pair of rolls is larger than the thickness of the metal plate, the delivery side tension applied to the metal plate is zero. state, the metal sheet is rolled down by the pair of rolling rolls, the entry-side tension applied to the metal sheet by the unwinding device is made greater than zero, and the pair of rolling rolls is configured to start rotating. .

According to the above configuration (1), after the leading end of the metal plate is passed between the pair of rolling rolls, the metal plate is rolled down by the pair of rolling rolls in a state where the tension on the delivery side applied to the metal plate is zero. , while applying an entry-side tension greater than zero to the metal plate, the rolling rolls are started to rotate to start rolling the metal plate. can be appropriately rolled while suppressing Therefore, rolling can be started from a portion near the tip of the metal plate without using a lead material or the like, and the yield of the metal plate can be improved with a simple structure.

(2) In some embodiments, in the configuration of (1) above,
The control device is
After the rolling rolls start rotating, the entry side tension is increased within a specified range while the exit side tension applied to the metal plate is zero.

According to the configuration (2) above, after the rolling rolls start rotating, the tension on the exit side applied to the metal plate is zero, and the tension on the exit side is increased within a specified range, so there is no tension on the exit side. Meandering of the metal plate can be more effectively suppressed during rolling in the state of , and rolling can be performed more appropriately.

(3) In some embodiments, in the configuration of (2) above,
The control device is
The entry-side tension is adjusted so that the delivery-side speed Vd of the metal plate is equal to or higher than the rotational speed Vm of the rolling rolls.

The fact that the delivery side speed Vd of the metal plate is less than the rotation speed Vm of the rolling rolls means that the metal plate is not moving forward with respect to the rolling rolls on the delivery side of the rolling rolls (that is, the metal plate is moving with respect to the rolling rolls It means that it is starting to slip or is about to slip), in which case it may not be possible to perform rolling properly. In this respect, according to the above configuration (3), the entry-side tension applied to the metal plate is adjusted so that the delivery-side speed Vd of the metal plate is equal to or higher than the rotation speed Vm of the rolling rolls. Rolling can be performed more appropriately while properly suppressing the slip of the metal plate on the rolling rolls in a non-tensioned state.

(4) In some embodiments, in the configuration of (2) or (3) above,
The control device is
It is configured to acquire the delivery side velocity Vd of the metal plate measured a plurality of times for each prescribed period, and to adjust the entry side tension based on the measurement results of the delivery side velocity Vd over the plurality of times.

The delivery side velocity Vd of the metal plate can be an index of whether or not the metal plate slips on the rolling rolls. In this regard, according to the above configuration (4), the delivery side speed Vd of the metal plate is measured a plurality of times in each prescribed period, so that changes in the delivery side speed Vd over time can be grasped. . Therefore, by adjusting the entry-side tension applied to the metal plate based on the results of measuring the delivery-side speed Vd over a plurality of times, the slip of the metal plate on the rolling rolls is appropriately suppressed while the delivery-side is in a state of no tension. Rolling can be performed appropriately.

(5) In some embodiments, in the configurations of (2) to (4) above,
The control device is
When it is detected that the metal plate is not advancing to the delivery side of the rolling roll in a state where the delivery side tension applied to the metal plate is zero, the increase in the entry side tension is stopped.

The fact that the metal plate is not advancing to the exit side of the mill rolls indicates that the metal plate is starting to slip on the mill rolls or is likely to slip in the near future (sign of slip). In this regard, according to the configuration (5) above, when it is detected that the metal plate is not advancing to the delivery side of the rolling roll, the increase in the entry side tension is stopped. , rolling can be performed appropriately while suppressing the slip of the metal plate on the rolling rolls more reliably.

(6) In some embodiments, in the configuration of (4) or (5) above,
The control device is
The delivery speed Vd measured a specified number of times in each specified period is obtained, and the delivery speed Vd _i measured for the i-th time and the delivery speed Vd measured for the (i-1) time _(i-1) are obtained. is configured to stop increasing the entry side tension when the difference between is all negative.

According to the above configuration (6), when the difference between the i-th measured delivery speed Vd _i and the (i-1)-th measured delivery speed Vd _(i-1) is all negative. That is, the delivery side speed Vd is gradually decreasing while the delivery side speed Vd is being measured a specified number of times for each specified period. Since it is made to stop, it is possible to roll the metal plate appropriately while suppressing the slip of the metal plate on the rolling rolls in a state of no tension on the delivery side.

(7) In some embodiments, in the configuration of (4) or (5) above,
The control device is
The delivery speed Vd measured a specified number of times in each specified period is obtained, and the delivery speed Vd _i measured for the i-th time and the delivery speed Vd measured for the (i-1) time _(i-1) are obtained. is less than a specified value, the increase in the entry-side tension is stopped.

According to the above configuration (7), the integrated value of the difference between the i-th measured delivery speed Vd _i and the (i-1)-th measured delivery speed Vd _(i-1) is defined. value, i.e., while the delivery side speed Vd is being measured a specified number of times for each specified period, the delivery side speed Vd is gradually decreasing and there is a high possibility that a slip will occur in the near future. Since the increase in tension is stopped, it is possible to roll the metal plate appropriately while suppressing the slip of the metal plate on the rolling rolls in a state of no tension on the delivery side.

(8) In some embodiments, in the configuration of any one of (5) to (7) above,
The control device is
After stopping the increase in the entry-side tension, the entry-side tension is reduced by a specified amount.

According to the above configuration (8), after the increase in the tension on the entry side is stopped in order to suppress the slip, the tension on the entry side is reduced by a specified amount. Rolling can be performed appropriately while further reliably suppressing slip on the rolling rolls.

(9) In some embodiments, in any of the above configurations (2) to (5),
The control device is
The delivery side speed Vd of the metal plate and the roll speed Vm, which is the peripheral speed of the rolling roll, are obtained, and the input Configured to adjust lateral tension.

The difference (Vd−Vm) between the delivery side speed Vd of the metal plate and the roll speed Vm can be an index of whether or not the metal plate slips on the rolling rolls. In this respect, according to the above configuration (9), the delivery side is adjusted by adjusting the entry side tension applied to the metal plate based on the difference (Vd−Vm) between the delivery side speed Vd of the metal plate and the roll speed Vm. In a non-tensioned state, it is possible to appropriately roll the metal plate while appropriately suppressing the slip of the metal plate on the rolling rolls.

(10) A rolling facility according to at least one embodiment of the present invention,
a pair of rolling rolls provided so as to sandwich a metal sheet; and an unwinding device for unrolling the metal sheet on the entry side of the rolling rolls in the direction in which the metal sheet advances. A rolling device configured to roll with a pair of rolling rolls;
and a control device according to any one of (1) to (9) above.

According to the above configuration (10), after the leading end of the metal plate is passed between the pair of rolling rolls, the metal plate is pressed down by the pair of rolling rolls in a state where the tension on the delivery side applied to the metal plate is zero. , while applying an entry-side tension greater than zero to the metal plate, the rolling rolls are started to rotate to start rolling the metal plate. can be appropriately rolled while suppressing Therefore, rolling can be started from a position near the tip of the metal plate without using a lead material or the like, and the yield of the metal plate can be improved with a simple structure.

(11) A method for operating a rolling mill according to at least one embodiment of the present invention includes:
An unwinding device for applying an entry-side tension to the metal plate, and a pair of rolling rolls provided so as to sandwich the metal plate on the delivery side of the unwinding device in the advancing direction of the metal plate, An operation method for operating a rolling mill configured to roll a metal plate with the pair of rolling rolls,
a sheet threading step of passing the front end portion of the metal plate between the pair of rolling rolls in a state where the gap between the pair of rolling rolls is larger than the plate thickness of the metal plate;
a rolling step of rolling down the metal plate with the pair of rolling rolls in a state where tension on the delivery side applied to the metal plate is zero after the step of threading;
After the rolling step, a tension applying step of increasing the entry-side tension applied to the metal plate by the unwinding device to more than zero while the delivery-side tension applied to the metal plate is zero;
After the tension applying step, a rolling start step of starting rotation of the pair of rolling rolls in a state where the delivery side tension applied to the metal plate is zero;
Prepare.

According to the above method (11), after the leading end of the metal plate is passed between the pair of rolling rolls, the metal plate is rolled down by the pair of rolling rolls in a state where no tension is applied to the metal plate on the delivery side. , while applying an entry-side tension greater than zero to the metal plate, the rolling rolls are started to rotate to start rolling the metal plate. can be appropriately rolled while suppressing Therefore, rolling can be started from a portion near the tip of the metal plate without using a lead material or the like, and the yield of the metal plate can be improved with a simple structure.

(12) In some embodiments, in the method of (11) above,
After the rolling start step, the entry side tension is increased within a specified range while the exit side tension applied to the metal plate is zero.

According to the above method (12), after the rolling rolls start rotating, the tension on the exit side applied to the metal plate is zero, and the tension on the exit side is increased within a specified range, so there is no tension on the exit side. Meandering of the metal plate can be more effectively suppressed during rolling in the state of , and rolling can be performed more appropriately.

(13) In some embodiments, in the method of (12) above,
The entry-side tension is adjusted so that the delivery-side speed Vd of the metal plate is equal to or higher than the rotation speed Vm of the rolling rolls.

The fact that the delivery side speed Vd of the metal plate is less than the rotation speed Vm of the rolls means that the metal plate is not moving forward with respect to the rolls on the delivery side of the rolls. There are things that cannot be done. In this respect, according to the above method (13), the entry-side tension applied to the metal plate is adjusted so that the delivery-side speed Vd of the metal plate is equal to or higher than the rotation speed Vm of the rolling rolls. Rolling can be performed more appropriately while properly suppressing the slip of the metal plate on the rolling rolls in a non-tensioned state.

(14) In some embodiments, in the method of (12) or (13) above,
The delivery side velocity Vd of the metal plate measured a plurality of times for each prescribed period is obtained, and the entry side tension is adjusted based on the measurement results of the delivery side velocity Vd over the plurality of times.

The delivery side velocity Vd of the metal plate can be an index of whether or not the metal plate slips on the rolling rolls. In this regard, according to the above method (14), the delivery speed Vd of the metal plate is measured a plurality of times for each specified period, so that changes in the delivery speed Vd over time can be grasped. . Therefore, by adjusting the entry-side tension applied to the metal plate based on the results of measuring the delivery-side speed Vd over a plurality of times, the slip of the metal plate on the rolling rolls is appropriately suppressed with no tension on the delivery side. Rolling can be performed appropriately.

(15) In some embodiments, in the method of any one of (12) to (14) above,
When it is detected that the metal plate is not advancing to the delivery side of the rolling rolls while the delivery side tension applied to the metal plate is zero, the increase in the entry side tension is stopped.

The fact that the metal plate is not advancing to the exit side of the mill rolls indicates that the metal plate is starting to slip on the mill rolls or is likely to slip in the near future (sign of slip). In this respect, according to the above method (15), when it is detected that the metal plate has not advanced to the delivery side of the rolling roll, the increase in the entry side tension is stopped. , rolling can be performed appropriately while suppressing the slip of the metal plate on the rolling rolls more reliably.

(16) In some embodiments, in the method of (14) or (15) above,
The delivery speed Vd measured a specified number of times in each specified period is obtained, and the delivery speed Vd _i measured for the i-th time and the delivery speed Vd measured for the (i-1) time _(i-1) are obtained. When the difference between is all negative, the increase in the entry side tension is stopped.

According to the above method (16), when the difference between the delivery speed Vd _i measured for the i-th time and the delivery speed Vd _(i-1) measured for the (i-1) time is all negative That is, the delivery side speed Vd is gradually decreasing while the delivery side speed Vd is being measured a specified number of times for each specified period. Since it is made to stop, it is possible to roll the metal plate appropriately while suppressing the slip of the metal plate on the rolling rolls in a state of no tension on the delivery side.

(17) In some embodiments, in the method of (14) or (15) above,
The delivery speed Vd measured a specified number of times in each specified period is obtained, and the delivery speed Vd _i measured for the i-th time and the delivery speed Vd measured for the (i-1) time _(i-1) are obtained. When the integrated value of the difference between is less than a specified value, the increase in the entry side tension is stopped.

According to the method (17) above, the integrated value of the difference between the delivery speed Vd _i measured for the i-th time and the delivery speed Vd _(i-1) measured for the (i-1) time is defined. value, i.e., while the delivery side speed Vd is being measured a specified number of times for each specified period, the delivery side speed Vd is gradually decreasing and there is a high possibility that a slip will occur in the near future. Since the increase in tension is stopped, it is possible to roll the metal plate appropriately while suppressing the slip of the metal plate on the rolling rolls in a state of no tension on the delivery side.

(18) In some embodiments, in the method of any one of (15) to (17) above,
After stopping the increase in the entry-side tension, the entry-side tension is decreased by a specified amount.

According to the above method (18), after stopping the increase in the tension on the entry side in order to suppress the slip, the tension on the entry side is reduced by a specified amount. Rolling can be performed appropriately while further reliably suppressing slip on the rolling rolls.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and includes modifications of the above-described embodiments and modes in which these modes are combined as appropriate.

As used herein, expressions such as "in a certain direction", "along a certain direction", "parallel", "perpendicular", "center", "concentric" or "coaxial", etc. express relative or absolute arrangements. represents not only such arrangement strictly, but also the state of being relatively displaced with a tolerance or an angle or distance to the extent that the same function can be obtained.
For example, expressions such as "identical", "equal", and "homogeneous", which express that things are in the same state, not only express the state of being strictly equal, but also have tolerances or differences to the extent that the same function can be obtained. It shall also represent the existing state.
Further, in this specification, expressions representing shapes such as a quadrilateral shape and a cylindrical shape not only represent shapes such as a quadrilateral shape and a cylindrical shape in a geometrically strict sense, but also within the range in which the same effect can be obtained. , a shape including an uneven portion, a chamfered portion, and the like.
Moreover, in this specification, the expressions “comprising”, “including”, or “having” one component are not exclusive expressions excluding the presence of other components.

1 Rolling Equipment 2 Rolling Mill 4 Unwinding Device 5 Motor 6 Entrance Pinch Roll 8 Side Guide 10 Rolling Mill 11 Motor 12 Exit Pinch Roll 14 Winding Device 15 Motor 16A Rolling Roll 16B Rolling Roll 18A Intermediate Roll 18B Intermediate Roll 20A Backup Roll 20B Backup roll 22 Rolling device 30 Control device 32 Speed sensor 34 Tension sensor 36 Speed sensor 37 Rolling position sensor 38 Plate edge position detector 40 Speed sensor 50 Metal plate 51 Tip

Claims (15)

a pair of rolling rolls provided so as to sandwich a metal sheet; and an unwinding device for unrolling the metal sheet on the entry side of the rolling rolls in the direction in which the metal sheet advances. A control device for controlling a rolling mill configured to roll with a pair of rolling rolls,
After the leading end of the metal plate is passed between the pair of rolls in a state in which the gap between the pair of rolls is larger than the thickness of the metal plate, the delivery side tension applied to the metal plate is zero. state, the metal plate is rolled down by the pair of rolling rolls, the entry-side tension applied to the metal plate by the unwinding device is made greater than zero, and the pair of rolling rolls is configured to start rotating ,
After the rolling rolls start rotating, the entry-side tension is increased within a specified range while the exit-side tension applied to the metal plate is zero.
Rolling mill controller. 2. A control device for a rolling mill according to claim 1 , wherein said entry-side tension is adjusted so that the delivery-side speed Vd of said metal plate is greater than or equal to the rotational speed Vm of said rolling rolls. 2. A method of obtaining the delivery side speed Vd of the metal plate which is measured a plurality of times for each specified period, and adjusting the entry side tension based on the measurement results of the delivery side speed Vd over the plurality of times. 3. A control device for a rolling mill according to 1 or 2 . 2. When it is detected that the metal plate is not advancing to the delivery side of the rolling rolls in a state where the delivery side tension applied to the metal plate is zero, the increase in the entry side tension is stopped. 4. A control device for a rolling mill according to any one of items 1 to 3 . The delivery speed Vd measured a specified number of times in each specified period is obtained, and the delivery speed Vd _i measured for the i-th time and the delivery speed Vd measured for the (i-1) time _(i-1) are obtained. 5. A control device for a rolling mill according to claim 3 or 4 , configured to stop increasing the entry side tension when all the differences between and are negative. The delivery speed Vd measured a specified number of times in each specified period is obtained, and the delivery speed Vd _i measured for the i-th time and the delivery speed Vd measured for the (i-1) time _(i-1) are obtained. 5. A control device for a rolling mill according to claim 3 or 4 , configured to stop increasing the entry-side tension when the integrated value of the difference between is less than a specified value. 7. The control device for a rolling mill according to claim 4 , wherein said entry-side tension is reduced by a specified amount after stopping the increase of said entry-side tension. The delivery side speed Vd of the metal plate and the roll speed Vm, which is the peripheral speed of the rolling roll, are obtained, and the input 5. A control device for a rolling mill according to any one of claims 1 to 4 , adapted to adjust the lateral tension. a pair of rolling rolls provided so as to sandwich a metal sheet; and an unwinding device for unrolling the metal sheet on the entry side of the rolling rolls in the direction in which the metal sheet advances. A control device for controlling a rolling mill configured to roll with a pair of rolling rolls,
After the leading end of the metal plate is passed between the pair of rolls in a state in which the gap between the pair of rolls is larger than the thickness of the metal plate, the delivery side tension applied to the metal plate is zero. state, the metal plate is rolled down by the pair of rolling rolls, the entry-side tension applied to the metal plate by the unwinding device is made greater than zero, and the pair of rolling rolls is configured to start rotating,
After starting the rotation of the rolling rolls, the speed of the rolling rolls is increased in a state where the tension on the exit side applied to the metal plate is zero and the tension on the entry side is greater than zero .
Rolling mill controller. a pair of rolling rolls provided so as to sandwich a metal sheet; and an unwinding device for unrolling the metal sheet on the entry side of the rolling rolls in the direction in which the metal sheet advances. A rolling device configured to roll with a pair of rolling rolls;
a control device according to any one of claims 1 to 9 ;
rolling equipment. An unwinding device for applying an entry-side tension to the metal plate, and a pair of rolling rolls provided so as to sandwich the metal plate on the delivery side of the unwinding device in the advancing direction of the metal plate, An operation method for operating a rolling mill configured to roll a metal plate with the pair of rolling rolls,
a sheet threading step of passing the front end portion of the metal plate between the pair of rolling rolls in a state where the gap between the pair of rolling rolls is larger than the plate thickness of the metal plate;
a rolling step of rolling down the metal plate with the pair of rolling rolls in a state where tension on the delivery side applied to the metal plate is zero after the step of threading;
After the rolling step, a tension applying step of increasing the entry-side tension applied to the metal plate by the unwinding device to greater than zero while the delivery-side tension applied to the metal plate is zero;
After the tension applying step, a rolling start step of starting rotation of the pair of rolling rolls in a state where the delivery side tension applied to the metal plate is zero;
with
After the rolling start step, the entry side tension is increased within a specified range while the exit side tension applied to the metal plate is zero.
How to operate a rolling mill. 12. The method of operating a rolling mill according to claim 11 , wherein the entry-side tension is adjusted such that the delivery-side speed Vd of the metal sheet is equal to or higher than the rotational speed Vm of the rolling rolls. 13. The method according to claim 11 or 12 , wherein the delivery side speed Vd of the metal plate measured multiple times for each prescribed period is acquired, and the entry side tension is adjusted based on the measurement results of the delivery side speed Vd over the multiple times. method of operating the rolling mill. 14. The method according to any one of claims 11 to 13 , wherein when it is detected that the metal plate is not advancing to the delivery side of the rolling rolls while the delivery side tension applied to the metal plate is zero, the increase in the entry side tension is stopped. A method of operating the rolling mill according to item 1. An unwinding device for applying an entry-side tension to the metal plate, and a pair of rolling rolls provided so as to sandwich the metal plate on the delivery side of the unwinding device in the advancing direction of the metal plate, An operation method for operating a rolling mill configured to roll a metal plate with the pair of rolling rolls,
a sheet threading step of passing the front end portion of the metal plate between the pair of rolling rolls in a state where the gap between the pair of rolling rolls is larger than the plate thickness of the metal plate;
a rolling step of rolling down the metal plate with the pair of rolling rolls in a state where tension on the delivery side applied to the metal plate is zero after the step of threading;
After the rolling step, a tension applying step of increasing the entry-side tension applied to the metal plate by the unwinding device to more than zero while the delivery-side tension applied to the metal plate is zero;
After the tension applying step, a rolling start step of starting rotation of the pair of rolling rolls in a state where the delivery side tension applied to the metal plate is zero;
with
After the rolling start step, the speed of the rolling rolls is increased while the exit side tension applied to the metal sheet is zero and the entry side tension is greater than zero.
How to operate a rolling mill .

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