WO2023047513A1

WO2023047513A1 - Control device for controlling rolling device, rolling facility, and method for controlling rolling device

Info

Publication number: WO2023047513A1
Application number: PCT/JP2021/034999
Authority: WO
Inventors: 陽一松井; 優太小田原
Original assignee: ＰｒｉｍｅｔａｌｓＴｅｃｈｎｏｌｏｇｉｅｓＪａｐａｎ株式会社
Priority date: 2021-09-24
Filing date: 2021-09-24
Publication date: 2023-03-30
Also published as: JPWO2023047513A1; EP4374984A1; CN117615863A

Abstract

A control device for controlling a rolling device that includes a pair of rolling rolls for rolling a metal strip, an unwinding machine for unwinding the metal strip toward the pair of rolling rolls, and a winding machine for winding the metal strip that has been rolled by the pair of rolling rolls, said control device comprising a rotation control unit for controlling the rotation of the rolling rolls, a speed acquisition unit configured so as to acquire the speed of the metal strip between the unwinding machine and the rolling rolls, and a separation detection unit configured so as to detect separation of the tail end of the metal strip from the unwinding machine, wherein the rotation control unit is configured so as to stop the rotation of the pair of rolling rolls on the basis of the separation timing, which is the timing at which separation of the tail end from the unwinding machine is detected by the separation detection unit, and the speed of the metal strip as acquired by the speed acquisition unit.

Description

Control device for rolling mill, rolling equipment, and method for controlling rolling mill

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

A reverse rolling mill is known that reciprocates and rolls a metal plate passed between a pair of rolling rolls.

Patent Document 1 discloses a reverse-type rolling mill equipped with a rolling stand including rolling rolls and two reels (unwinding machine and winding machine) arranged in front of and behind the rolling stand. there is In this rolling apparatus, in a process (rolling pass) in which the material unwound from the first reel is rolled by the rolling stand and wound by the second reel (rolling pass), the tail end of the material separated from the first reel is When the material reaches the delivery side of the rolling stand, the rolling device is stopped and the next pass of rolling (the process of rolling the material unwound from the second reel with the rolling stand and winding it with the first reel) is started. It's becoming

Japanese Patent Application Laid-Open No. 2000-202503

As in the reverse type rolling mill described in Patent Document 1, rolling is continued even after the tail end of the strip (rolled material) has left the unwinder, so that the tail end of the strip is gripped by the unwinder. The yield can be improved as compared with the case where rolling is performed while maintaining the state. On the other hand, it takes time to accurately stop the tail end of the strip unwound from the unwinder at a position suitable for starting rolling in the next pass. After the trailing end of the strip stops, when the next pass starts rolling, the leading end of the strip (the trailing end of the previous pass) is smoothed by a deflector roll or the like provided between the unwinder and the rolling rolls. It can be difficult to get through and can be a waste of time.

In view of the above circumstances, at least one embodiment of the present invention provides a rolling mill control device, a rolling mill, and a rolling mill control method capable of improving the yield while suppressing an increase in the time required for rolling. intended to

A control device for a rolling mill according to at least one embodiment of the present invention comprises:
A pair of rolling rolls for rolling a metal strip, an unwinder for unwinding the strip toward the pair of rolling rolls, and a winding of the strip rolled by the pair of rolling rolls. A control device for controlling a rolling mill comprising a winder for taking up,
a rotation control unit for controlling the rotation of the rolling rolls;
a speed acquisition unit configured to acquire the speed of the strip between the unwinder and the rolling roll;
a detachment detection unit configured to detect that the tail end of the strip is detached from the unwinder;
with
The rotation control unit is configured based on the detachment timing, which is the timing at which detachment of the tail end from the unwinder is detected by the detachment detection unit, and the speed of the strip acquired by the speed acquisition unit. , configured to stop the rotation of the pair of rolling rolls.

A rolling facility according to at least one embodiment of the present invention comprises:
A pair of rolling rolls for rolling a metal strip, an unwinder for unwinding the strip toward the pair of rolling rolls, and a winding of the strip rolled by the pair of rolling rolls. a rolling device including a winder for taking off;
a control device as described above for controlling the rolling mill;
Prepare.

A method for controlling a rolling mill according to at least one embodiment of the present invention comprises:
A pair of rolling rolls for rolling a metal strip, an unwinder for unwinding the strip toward the pair of rolling rolls, and a winding of the strip rolled by the pair of rolling rolls. A control method for controlling a rolling mill comprising:
a rotation control step of controlling the rotation of the rolling roll;
a speed obtaining step of obtaining the speed of the strip between the unwinder and the rolling roll;
a separation detection step of detecting separation of the tail end of the strip from the unwinder;
with
In the rotation control step, based on the detachment timing, which is the timing at which detachment of the tail end from the unwinder is detected in the detachment detection step, and the speed of the strip obtained in the speed obtaining step. , to stop the rotation of the pair of rolling rolls.

According to at least one embodiment of the present invention, there is provided a rolling mill control device, a rolling mill, and a rolling mill control method capable of improving the yield while suppressing an increase in the time required for rolling.

1 is a schematic configuration diagram of a rolling facility to which a control device according to one embodiment is applied; FIG. 1 is a partial cross-sectional view of an unwinder (winder) according to one embodiment; FIG. 1 is a schematic configuration diagram of a control device according to an embodiment; FIG. 4 is a flow chart of a method for controlling a rolling mill according to one embodiment. It is a figure for demonstrating the flow of control of the rolling mill which concerns on one Embodiment. It is a figure for demonstrating the flow of control of the rolling mill which concerns on one Embodiment. It is a figure for demonstrating the flow of control of the rolling mill which concerns on one Embodiment. It is a figure for demonstrating the flow of control of the rolling mill which concerns on one Embodiment. 5 is a graph showing an example of changes over time in sensor detection values, strip velocity, and gripper open/closed states; 5 is a graph showing an example of changes over time in sensor detection values, strip velocity, and gripper open/closed states; It is a figure for demonstrating the number of turns of the strip plate in an unwinding machine. It is a figure for demonstrating the number of turns of the strip plate in an unwinding machine. It is a schematic diagram of a pressing part according to one embodiment. It is a schematic diagram of a pressing part according to one embodiment. It is a schematic diagram of a pressing part according to one embodiment. FIG. 10 is a diagram for explaining an example of a procedure for correcting the shape of the tail end of the strip; FIG. 10 is a diagram for explaining an example of a procedure for correcting the shape of the tail end of the strip; FIG. 10 is a diagram for explaining an example of a procedure for correcting the shape of the tail end of the strip; FIG. 10 is a diagram for explaining an example of a procedure for correcting the shape of the tail end of the strip;

Several embodiments of the present invention will be described below 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.

(Composition of rolling equipment)
FIG. 1 is a schematic configuration diagram of a rolling facility to which a control device according to one embodiment is applied. As shown in FIG. 1 , the rolling facility 100 includes a rolling mill 1 for rolling a metal strip S (for example, a strip-shaped steel plate) and a control device 50 for controlling the rolling mill 1 .

The rolling mill 1 includes a rolling mill 10 for rolling the strip S, and an unwinder 2 provided on the entry side of the rolling mill 10 (that is, upstream of the rolling mill 10 in the traveling direction of the strip S being rolled). and a winder 3 provided on the delivery side of the rolling mill 10 (that is, on the downstream side of the rolling mill 10 in the traveling direction of the strip S being rolled). The rolling mill 1 may include, for example, one rolling mill 10 as shown in FIG. 1, or may include two or more rolling mills 10 .

The rolling mill 10 includes a pair of rolling rolls (work rolls) 15 and 16 provided on both sides of the strip S with the strip S sandwiched therebetween. As shown in FIG. 1, the rolling mill 10 includes a pair of

intermediate rolls

17 and 18 and a pair of

backup rolls

19 and 20 provided on opposite sides of the strip S with a pair of

rolling rolls

15 and 16 interposed therebetween. , may include

Intermediate rolls

17,18 and

backup rolls

19,20 are configured to support

mill rolls

15,16. Further, the rolling mill 10 is provided with a roll-down device (hydraulic cylinder or the like; not shown) for applying a load to the pair of rolling

rolls

15 and 16 to roll down the strip S between the pair of

rolling rolls

15 and 16. there is

A motor 11 is connected to the

rolling rolls

15 and 16 via a spindle (not shown) or the like, and the

rolling rolls

15 and 16 are rotationally driven by the motor. When the strip S is rolled, the

rolls

15 and 16 are rotated by the motor 11 while the strip S is rolled down by the roll-down device, thereby generating a frictional force between the

rolls

15 and 16 and the strip S. The strip S is sent to the delivery side of the rolling

rolls

15 and 16 by frictional force.

The unwinding machine 2 is configured to unwind the coil of the strip S toward the rolling mill 10 . The unwinding machine 2 includes a mandrel 4 which is rotated by a motor (not shown) to unwind the strip S toward the rolling mill 10 . When the strip S is rolled, the mandrel 4 of the unwinding machine 2 is driven by a motor (not shown) to apply tension to the strip S on the entry side.

The winder 3 is configured to wind the strip S from the rolling mill 10 . The winder 3 includes a mandrel 5, and the mandrel 5 is rotated by a motor (not shown) to wind the strip S. As shown in FIG. When the strip S is rolled while being wound on the mandrel 5 of the winder 3, the mandrel 5 of the winder 3 applies tension to the strip S on the delivery side.

As shown in FIG. 1, between the mandrel 4 of the unwinding machine 2 and the rolling mill 10, a guide part 12 for guiding the strip S introduced from the mandrel 4 of the unwinding machine 2 into the rolling mill 10 is provided. may be provided. Between the rolling mill 10 and the mandrel 5 of the winding machine 3, a guide part 13 for guiding the strip S sent from the rolling mill 10 to the mandrel 5 of the winding machine 3 may be provided. The

sections

12,13 may include deflector rolls 6,7 and/or guide tables 8,9.

In some embodiments, the rolling mill 1 is a reverse rolling mill (reverse mill) that reciprocates and rolls the strip S passed between a pair of rolling rolls 15 and 16 . In the reverse type rolling mill 1, the rolling is stopped just before the tail end St of the strip S unwound from the mandrel 4 of the unwinder 2, and the strip S is rolled down by the rolling rolls 15 and 16 for odd-numbered rolls. Rolling (first pass, etc.) is completed. Next, the strip S is unwound from the mandrel 5 of the winding machine 3 toward the rolling mill 10, and while the strip S is wound by the mandrel 4 of the unwinding machine 2, it is moved in the direction opposite to the previous one. The strip S is advanced to perform even-numbered rolling (second pass, etc.). That is, the role of the unwinding machine 2 and the role of the winding machine 3 are exchanged according to the traveling direction of the strip S.

FIG. 2 is a partial cross-sectional view of the unwinding machine 2 (winding machine 3) according to one embodiment, and is a diagram for explaining the operation of the unwinding machine 2 (winding machine 3). As shown in FIGS. 1 and 2, the unwinding machine 2 includes a gripper 22 for gripping the tail end portion Sa including the tail end St of the strip S. As shown in FIGS. The winder 3 also includes a gripper 23 for gripping the tip of the strip S including the tip.

In the exemplary embodiment shown in FIG. 2, the

grippers

22, 23 are provided radially inside the

mandrels

4, 5 relative to the outer peripheral surfaces of the

mandrels

4, 5 so as to be movable along the radial direction. The

mandrels

4,5 are provided with slots 24 which open into the surface of the

mandrels

4,5 and are capable of receiving the trailing or leading edge of the strip S.

The

grippers

22 and 23 are moved radially outward by an actuator (not shown) or the like, and a force directed from the

grippers

22 and 23 toward the

mandrels

4 and 5 is applied to the strip S, so that the trailing end or the leading end of the strip is moved. Grasped. By moving the

grippers

22 and 23 inward in the radial direction by an actuator or the like and releasing the force acting on the strip S from the

grippers

22 and 23, the

grippers

22 and 23 grip the tail end or the tip of the strip S. is released.

When the strip S is rolled by the rolling mill 1, basically, the

grippers

22 and 23 grip the trailing end and the leading end of the strip S, and apply tension to the strip S while rolling the rolling rolls. 15, 16 and the

mandrels

4, 5 of the unwinder 2 and winder 3 are rotated.

As shown in FIG. 1, the rolling facility 100 may include a pressing section 30 for correcting the shape of the trailing end portion Sa of the strip S. A more specific configuration of the pressing portion 30 will be described later.

As shown in FIG. 1, the rolling facility 100 may include a speed sensor 40 for detecting the speed of the strip S between the unwinder 2 and the rolling rolls 15,16. The speed sensor 40 and the control device 50 are electrically connected, and a signal indicating the speed of the strip S detected by the speed sensor 40 is sent to the control device 50 .

As shown in FIG. 1, the rolling facility 100 may include a sensor 42 for detecting the separation of the tail end St of the strip S from the unwinder 2. The sensor 42 may be a sensor capable of detecting the presence or absence of the strip S at a position above, below or on the side of the unwinding machine 2 . The sensor 42 may be a rangefinder (laser rangefinder or the like) capable of detecting the distance from the sensor 42 to the strip S. The sensor 42 and the control device 50 are electrically connected, and a signal indicating the detection result by the sensor 42 is sent to the control device 50 .

　The sensor 42 shown in FIG. 1 is a sensor capable of detecting the presence or absence of the strip S at a position below the unwinding machine 2. The sensor 42 shown in FIG. 1 is a distance sensor provided at a position below the unwinding machine 2 and capable of detecting the distance between the sensor 42 and the strip S in the horizontal direction.

FIG. 3 is a schematic configuration diagram of the control device 50 according to one embodiment. As shown in FIG. 3 , the control device 50 includes a rotation control section 52 , a speed acquisition section 54 and a detachment detection section 56 . The control device 50 may further comprise a gripping control 58 and/or a pressing control 60 .

The rotation control unit 52 is configured to control the rotation of the rolling rolls 15 and 16. More specifically, the rotation control unit 52 controls the separation timing, which is the timing at which separation of the tail end St of the strip S from the unwinding machine 2 is detected by the separation detection unit 56 (described later), and the speed acquisition unit 54 . The rolling rolls 15, 16 are configured to be stopped based on the speed of the strip S obtained by (described later). The rotation control unit 52 controls the length of the strip S from the position of the tail end St at the above-mentioned release timing to the planned stop position of the tail end St, in addition to the above-described release timing and the speed of the strip S. It may be configured to stop the rotation of the rolling rolls 15 and 16 .

The speed acquisition unit 54 is configured to acquire the speed of the strip S between the unwinder 2 and the rolling rolls 15 and 16 . The speed acquisition unit 54 may acquire the speed of the strip S based on the signal indicating the speed of the strip S received from the speed sensor 40 described above. Alternatively, the speed acquisition unit 54 acquires the rotation speed of the rolling rolls 15 and 16 or the motor 11 that drives the rolling rolls 15 and 16 from a rotation speed sensor or the like, and uses the backward movement rate or the like from the rotation speed to determine the strip S The velocity of the strip S may be obtained by estimating the velocity of .

The separation detection unit 56 is configured to detect that the tail end St of the strip S has separated from the unwinding machine 2 . The detachment detection unit 56 unwinds the strip S in the same direction as the guide unit 12 (the deflector roll 6 or the guide table 8, etc.) Based on a signal from a sensor 42 capable of detecting the presence or absence of the strip S at a position on the machine 2 side and above, below, or to the side of the unwinding machine 2, the unwinding machine 2 at the tail end St It may be configured to detect disengagement.

The sensor 42 may be configured to detect the presence or absence of the strip S at a position below the unwinder 2 (see sensor 42 in FIG. 1 and sensor 42A in FIGS. 5A to 5D). In this case, the detachment detection unit 56 detects that the tail end St is detached from the unwinder 2 based on the signal from the sensor 42 when the presence of the strip S at the position below the unwinder 2 is detected. You may be comprised so that it may determine.

The sensor 42 in FIG. 1 and the sensor 42A in FIGS. 5A to 5D are provided below the unwinding machine 2, and can detect the distance between the

sensors

42, 42A and the strip S in the horizontal direction. distance sensor.

Alternatively, sensor 42 may be configured to detect the presence or absence of strip S at a position above the unwinder (see

sensors

42B or 42C in FIGS. 5A-5D). In this case, the detachment detection unit 56 detects that the strip S is no longer present at a position above the unwinding machine 2 based on the signal from the sensor 42, and the trailing edge St is detected by the unwinding machine. It may be configured to determine that it has left 2.

A sensor 42B in FIGS. 5A to 5D is a distance sensor provided at a position above the unwinding machine 2 and capable of detecting the distance between the sensor 42B and the strip S in the horizontal direction. A sensor 42C in FIGS. 5A to 5D is a distance sensor provided at a position above the unwinding machine 2 and capable of detecting the distance between the sensor 42C and the strip S in the vertical direction.

Note that FIGS. 5A to 5D are diagrams for explaining the control flow of the rolling mill according to one embodiment. Although three

sensors

42A, 42B, and 42C are shown as sensors 42 in FIGS. 5A-5D, there is only one sensor 42 (eg, any one of sensors 42A-42C in FIGS. 5A-5D). If provided, separation of the tail end St of the strip S from the unwinding machine 2 can be detected.

The grip control unit 58 is configured to control the operation of the gripper 22 (that is, gripping and/or releasing the trailing end or leading end of the strip S by the gripper 22). The grip control unit 58 may be configured to release the gripping of the tail end portion Sa of the strip S by the gripper based on the number of turns of the strip S in the unwinding machine 2 . The number of turns of the strip S in the unwinder 2 is calculated from the number of turns or the length of the strip S at the start of the rolling pass and/or the angular position of the gripper 22 about the axis of rotation of the mandrel 4, etc. can be

The pressing control section 60 is configured to control the operation of the pressing section 30 . A more specific configuration of the press control unit 60 will be described later.

The control device 50 includes a computer equipped with a processor (CPU, etc.), a main storage device (memory device; RAM, etc.), an auxiliary storage device, an interface, and the like. Controller 50 is adapted to receive signals from speed sensor 40 and/or sensor 42 via an interface. The processor is configured to process the signal thus received. Also, the processor is configured to process the program deployed in the main memory. As a result, the functions of the above functional units (the rotation control unit 52, the speed acquisition unit 54, the detachment detection unit 56, etc.) are realized.

The processing content of the control device 50 is implemented as a program executed by the processor. The program may be stored, for example, in an auxiliary storage device. During program execution, these programs are expanded in the main memory. The processor reads the program from the main memory and executes the instructions contained in the program.

(Flow of control of rolling mill)
Next, control methods for the rolling mill 1 according to some embodiments will be described with reference to FIGS. 4 to 9. FIG. In the following, a case of controlling the above-described rolling mill 1 using the above-described control device 50 will be described, but in some embodiments, another device is used to execute the rolling mill control method. Alternatively, some of the steps described below may be performed manually.

FIG. 4 is a flowchart of a method for controlling a rolling mill according to one embodiment. 5A to 5D are diagrams for explaining the flow of control of the rolling mill according to one embodiment, and are diagrams showing temporal changes in the position of the strip S in the control of the rolling mill.

As shown in FIG. 4 , in the control method according to one embodiment, during the rolling of the strip S in the rolling mill 1 , the grip control unit 58 causes the gripper 22 of the unwinding machine 2 to grip the tail end Sa of the strip S. (S2). Also, the speed acquisition unit 54 acquires the speed of the strip S between the unwinder 2 and the rolling rolls 15 and 16 (S4). Further, the detachment detector 56 detects that the trailing end St of the strip S is detached from the unwinding machine 2 (S6). Then, based on the speed of the strip S acquired in step S4 and the timing (separation timing) at which separation of the tail end St from the unwinding machine 2 is detected by the rotation control unit 52, the rolling rolls The rotation of 15 and 16 is controlled and stopped (S8).

In step S2, when the number of turns of the strip S in the unwinding machine 2 becomes small during rolling of the strip S in the rolling mill 1, the actuator for moving the gripper 22 of the unwinding machine 2 is appropriately operated. Then, the gripper 22 releases the tail end portion Sa of the strip S (S2). In step S2, typically, the strip S is wound around the mandrel 4 of the unwinding machine 2 by one turn or more, and the gripper 22 releases the tail end Sa.

Before the gripper 22 releases the gripping of the tail end Sa of the strip S in step S2, the tail end and the tail end of the strip S are not separated from the mandrel 4, as shown in FIG. 5A. When the gripper 22 releases the tail end Sa of the strip S in step S2, as shown in FIG. 5B, the tail end St and the tail end Sa of the strip S are separated from the mandrel 4 (unwinder 2). do. As time elapses, the positions of the strip S and the tail end St change as shown in FIG. 5C and further as shown in FIG. 5D.

In step S4, the speed of the strip S between the unwinder 2 and the rolling rolls 15, 16 is obtained. In step S4, the speed of the above-described strip S may be obtained before the gripping of the tail end portion Sa by the gripper 22 is released in step S2. The velocity of S may be obtained. Further, the speed of the strip S described above may be acquired until the rolling rolls 15 and 16 are stopped in subsequent step S8. In step S4, the speed of the strip S may be obtained continuously or at predetermined intervals.

In step S6, separation of the tail end St from the unwinding machine 2 is detected based on a signal from the sensor 42 capable of detecting the presence or absence of the strip at a position above or below the mandrel 4 of the unwinding machine 2.

In one embodiment, the detection signal of a sensor 42A (see FIGS. 5A-5D) configured to detect the presence or absence of a strip at a position below the mandrel 4 of the unwinder 2 is used to detect the tail of the strip S. It is determined whether the end St is separated from the unwinding machine 2 or not.

Here, FIG. 6 shows the detected value of the sensor 42A and the speed of the strip S between the unwinder 2 and the rolling rolls 15 and 16 (hereinafter simply referred to as the speed of the strip S) during the period when the rolling mill is controlled. ), and a graph showing an example of changes over time in the open/closed state of the gripper 22. FIG. When the detected value _of the sensor 42A is DA _or more, the detected value indicates the horizontal distance between the sensor 42A and the strip S detected by the sensor 42A. This indicates that the presence of strip S has not been detected.

In the example shown in FIG. 6, the strip S is rolled at a steady speed by the rolling mill 1 until time t11. At time t12 after time t11, the gripper 22 releases the tail end Sa (step S2). Until time t12, the tail end and the tail end portion of the strip S are not separated from the mandrel 4, as shown in FIG. 5A. At time t12, as shown in the graph of FIG. 6, the detected value of sensor 42A is less than _DA , and the presence of strip S is not detected.

For a while from time t14 after time t12, the detected value of the sensor 42A is greater than or equal to _DA . That is, during this period, the sensor 42A detects the presence of the strip S at a position below the unwinding machine 2. As shown in FIG.

Note that FIG. 5B shows the state after time t12 and before time t14, in which the tail end St has separated from the unwinding machine 2, but has not reached the detection position of the sensor 42A. The presence of strip S is not detected by sensor 42A. FIG. 5C shows the state immediately after time t14, and since the tail end St has reached below the detection position of the sensor 42A, the presence of the strip S is detected by the sensor 42A. Thereafter, when the tail end St moves above the detection position of the sensor 42A, the existence of the strip S is no longer detected by the sensor 42A.

The detachment detection unit 56 determines that the tail end St has detached from the unwinding machine 2 at time t14 when the sensor 42A detects the presence of the strip S at the position below the unwinding machine 2. In this case, the timing (detachment timing) when the tail end St of the strip S is detached from the unwinding machine 2 is time t14.

In one embodiment, the detection signal of a

sensor

42B or 42C (see FIGS. 5A-5D) configured to detect the presence or absence of a strip at a position above the mandrel 4 of the unwinder 2 is used to determine the strip S is separated from the unwinding machine 2 or not.

Here, FIG. 7 shows the detection value of the sensor 42B, the speed of the strip S between the unwinder 2 and the rolling rolls 15 and 16, and the opening/closing state of the gripper 22 during the period when the rolling mill is controlled. It is a graph which shows an example of a time change. When the detection value of the sensor 42B is D _B or more, the detection value indicates the horizontal distance between the sensor 42B and the strip _S detected by the sensor 42B. This indicates that the presence of strip S has not been detected.

In the example shown in FIG. 7, the strip S is rolled at a steady speed by the rolling mill 1 until time t21. At time t22 after time t21, the gripper 22 releases the tail end Sa (step S2). Until time t22, the tail end and the tail end portion of the strip S are not separated from the mandrel 4, as shown in FIG. 5A. Further, at time t22, as shown in the graph of FIG. 6, the detection value of the sensor 42A is D _B or more, and the existence of the strip S is detected.

During the period after time t24 after time t22, the detected value of sensor 42B is less than _DB . That is, during this period, the sensor 42B does not detect the existence of the strip S at the position above the unwinding machine 2 .

Note that FIG. 5C shows the state after time t22 and before time t24, in which the tail end St is separated from the unwinding machine 2, but the strip S is present at the detection position of the sensor 42B. , the presence of the strip S is detected by the sensor 42B. FIG. 5D shows the state immediately after time t24, where the tail end St reaches above the detection position of the sensor 42B, so the presence of the strip S is no longer detected by the sensor 42A.

The detachment detection unit 56 determines that the tail end St has detached from the unwinding machine 2 at time t24 when the sensor 42B no longer detects the presence of the strip S at the position above the unwinding machine 2. In this case, the timing (detachment timing) at which the tail end St of the strip S is detached from the unwinding machine 2 is time t24.

In step S8, the rotation of the motor 11 is controlled based on the speed of the strip S obtained in step S4 and the timing (detachment timing) at which the tail end St is detected to be detached from the unwinder 2 in step S6. Then, the rolling rolls 15 and 16 stop rotating (S8).

In this way, by stopping the rotation of the rolling rolls 15 and 16 based on the speed of the strip S and the release timing of the trailing end St, the trailing end St is positioned at a desired position (for example, the rolling of the next pass can be started smoothly). The strip S can be stopped in any possible position; Therefore, in the reverse type rolling mill 1, even after the tail end St is separated from the unwinder 2, rolling can be continued until the rolling rolls 15 and 16 stop, and the rolling of the next pass can be started smoothly. can do. Therefore, the yield can be improved while suppressing an increase in the time required for rolling.

In step S8, in addition to the speed of the strip S and the release timing of the tail end St, the length of the strip S from the position of the tail end St at the release timing to the planned stop position of the tail end St is calculated. The rotation of 15 and 16 may be stopped. Since the length of movement of the strip S (that is, the length of movement of the tail end St) can be expressed as a time integral of the speed of the strip S, the time integral of the speed of the strip S acquired by the speed acquisition unit 54 is the above-mentioned By controlling the rotation and stop of the rolling rolls 15 and 16 (motor 11) by the rotation control unit so that the length of the strip S is obtained, the strip is adjusted such that the trailing end St is positioned at a desired stop position. Makes it easier to stop S. Therefore, it becomes easier to smoothly start rolling in the next pass.

A sensor for detecting the separation of the tail end St is the length of the strip S from the position of the tail end St at the time when the tail end St is separated from the unwinder 2 to the planned stop position of the tail end St. 42 (sensors 42A to 42C, etc.) and the expected stopping position of the tail end St may be used.

In step S8, for example, as shown in FIGS. 6 and 7, the speed of the strip S is increased from the timing at which the tail end St is separated from the unwinder 2 until the rolling rolls 15 and 16 are stopped. You can slow it down or slow it down. In the examples shown in FIGS. 6 and 7, the speed of the strip S is increased from time t15 or t25 to t16 or t26 after the departure timing (time t14 or t24), and from time t16 or t26 to time t17 or The speed of the strip S is reduced until t27 (when the rolling rolls 15 and 16 are stopped). In this way, by increasing the speed of the strip S as much as possible until just before the strip S stops, the time required for rolling the strip S can be shortened, and the speed of the strip S just before the strip S stops can be reduced. By doing so, it becomes easier to stably position the tail end St at the desired planned stop position.

Here, FIGS. 8 and 9 are diagrams for explaining the number of turns of the strip S in the unwinding machine 2. FIG. The number of turns of strip S is counted with reference to the angular position of gripper 22 about the axis of rotation of mandrel 4 of unwinder 2 . In FIG. 8, the angular position of the gripper 22 is the angular position T at which the strip S wound around the unwinder 2 is unwound toward the rolling rolls 15 and 16 (the shape of the strip S is changed from an arc to a straight line). changing position). That is, FIG. 8 shows a state in which the strip S is wound around the mandrel 4 of the unwinding machine 2 by one turn. In FIG. 9, the angular position of the gripper 22 is rotated 180 degrees from the angular position T described above. That is, FIG. 9 shows a state in which the strip S is wound around the mandrel 4 of the unwinding machine 2 by 1.5 turns.

In the above-described method, in step S2, the gripping of the tail end portion Sa by the gripper 22 may be released immediately before the tail end St of the strip S is separated from the unwinding machine 2.

While the gripper 22 of the unwinding machine 2 grips the tail end portion Sa of the strip S, tension acts on the strip S, so the portion of the strip S that is rolled during this period can become a product. In this regard, as described above, by releasing the grip of the tail end Sa by the gripper 22 immediately before the tail end St separates from the unwinder 2, the belt is held until just before the tail end St separates from the unwinder 2. The tension acting on the plate S can be maintained. Therefore, the yield can be improved more effectively.

More specifically, in step S2, the gripping of the tail end portion Sa by the gripper 22 may be released while the strip S is wound around the unwinder 2 by 2 turns or less or 1.7 turns or less.

In this way, by releasing the grip of the tail end Sa by the gripper 22 while the strip is wound around the unwinder 2 by 2 turns or less or 1.7 turns or less, the tail end St is wound. The tension acting on the strip S can be maintained until just before it leaves the delivery machine 2. - 特許庁

In addition, in step S2, the gripping of the tail end portion Sa by the gripper 22 may be released while the strip S is wound around the unwinder 2 by one turn or more than 1.5 turns.

The tail end St of the strip S can be detached from the unwinder 2 when the strip S is wound around the unwinder 2 by one turn or less. In this regard, as described above, while the strip S is wound around the unwinder 2 by more than 1 turn or 1.5 turns, that is, before the tail end of the strip S can be detached from the unwinder. Since the gripping of the tail end by the gripper is released, the tail end of the strip can be smoothly removed from the unwinding machine.

In some embodiments, the gripping of the tail end portion Sa by the gripper 22 may be released while the strip S is wound around the unwinder 2 by one or more and two or less turns. In some embodiments, the gripping of the tail end portion Sa by the gripper 22 may be released while the strip S is wound around the unwinder 2 by 1.5 turns or more and 1.7 turns or less.

In the above-described method, in step S2, the rotation speed of the rolling rolls 15 and 16 may be reduced during a period including the timing at which the gripper 22 releases the tail end portion Sa. For example, in the example shown in FIG. 6 or 7, a period (a period from t11 to t13 or a period from t21 to t23) including time t12 or t22 at which the gripper 22 releases the grip of the tail end Sa. , the rotational speeds of the rolling rolls 15 and 16 are reduced.

In this way, by reducing the rotation speed of the rolling rolls 15 and 16 when the grip of the trailing end portion Sa by the gripper 22 is released, the rolling rolls can be held until just before the timing when the trailing end portion Sa is released from the gripping. The rotational speed of 15, 16 is kept relatively high. Therefore, an increase in the time required for rolling can be effectively suppressed.

(Correcting the shape of the tail end by the pressing part)
Next, more specific configurations of the pressing portion 30 and the pressing control portion 60 for correcting the shape of the tail end portion Sa of the strip S will be described.

As shown in FIG. 1 , the pressing portion 30 is arranged in the direction of movement of the strip S from the rotation axis O of the deflector rolls 6 provided between the unwinder 2 and the rolling rolls 15 and 16 . , 16 at least partially. The pressing portion 30 is configured to apply a pressing force to the strip S along the plate thickness direction of the strip S. As shown in FIG.

The pressing control section 60 (see FIG. 3) is configured to control the operation of the pressing section 30 . The pressing control unit 60 may be configured to operate the pressing unit 30 so that the pressing unit 30 applies a pressing force to the strip S after the tail end St of the strip S is separated from the unwinding machine 2 . . The pressing control unit 60 may be configured to apply a pressing force to the strip S by the pressing unit 30 while the rolling rolls 15 and 16 are rotating (that is, while the strip S is being conveyed). good.

The tail end Sa of the strip S separated from the unwinding machine 2 usually has a relatively large curved shape (strong curl). According to the above-described configuration, after the tail end St is separated from the unwinder 2, the rolling rolls 15 and 16 are pushed in a state in which a pressing force is applied to the strip S by the pressing portion 30 provided near the deflector roll 6. Since it is made to rotate, the degree of bending of the tail end portion Sa can be reduced. By correcting the shape of the tail end portion Sa of the strip S in this manner, the rolling of the next pass can be started more smoothly. For example, the leading end of the strip S in the next pass (tail end Sa of the previous pass) can be easily passed through the guide portion 12, or the leading end of the strip S in the next pass can be passed through the winder (unwinding in the previous pass). It becomes easier to grip with the gripper of machine 2). Therefore, it is possible to effectively suppress an increase in the time required for rolling.

10 to 12 are schematic diagrams of the pressing portion 30 according to one embodiment.

The pressing part 30 shown in FIG. 10 is partially provided closer to the rolling rolls 15 and 16 than the deflector roll 6, and pinch rolls 32 configured to sandwich the strip S together with the deflector roll 6, and the strip S. and a push roll 34 provided on the opposite side of the pinch roll 32 with the strip S therebetween on the rolling rolls 15 and 16 side of the deflector roll 6 in the traveling direction. The push roll 34 is configured to be able to apply a pressing force to the strip S along the upward direction. As shown in FIG. 10, the center of the pinch rolls 32 in the traveling direction of the strip S (hereinafter also simply referred to as the traveling direction) is located on the side of the rolling rolls 15 and 16 by a distance L1 from the rotation axis of the deflector roll 6 in the traveling direction. It is located off. In addition, the center of the push roll 34 in the direction of travel is shifted from the center of the pinch roll 32 in the direction of travel by a distance L2 toward the rolling rolls 15 and 16 .

In this embodiment, the strip S is sandwiched between the deflector rolls 6 and the pinch rolls 32, and the

pressing rolls

15 and 16 are rotated in a state where the pressing force from the push rolls 34 is applied to the strip S, whereby the strip is The shape of the tail end portion Sa of the plate S can be corrected.

The pressing part 30 shown in FIG. 11 includes a pinch roll 33 that is partially provided closer to the rolling rolls 15 and 16 than the deflector roll 6 and configured to pinch the strip S together with the deflector roll 6 . The pinch rolls 33 are configured to apply a pressing force to the strip S along the direction from the center of the pinch rolls 33 to the center of the deflector rolls 6 . As shown in FIG. 11, the center of the pinch rolls 33 in the traveling direction of the strip S is located at a distance L3 from the rotation axis of the deflector rolls 6 toward the rolling rolls 15 and 16 in the traveling direction.

In this embodiment, the strip S is sandwiched between the deflector roll 6 and the pinch roll 33, and the pressing force from the pinch roll 33 is applied to the strip S while rotating the deflector roll 6 and the pinch roll 33. Rolling rolls 15 and 16 are rotated. By applying tension to the strip S in this manner, the shape of the tail end portion Sa of the strip S can be corrected.

The pressing portion 30 shown in FIG. 12 includes a forming portion 36 provided closer to the rolling rolls 15 and 16 than the deflector roll 6, and a receiving portion 38 provided on the side opposite to the forming portion 36 across the strip S. ,including. The forming part 36 is provided so as to be vertically movable. The receiving portion 38 has a contact surface 38a capable of coming into contact with the surface of the strip S with the strip S sandwiched between the forming portion 36 and the forming portion 36 . Further, the receiving portion 38 is configured to change its posture according to the vertical movement of the forming portion 36 . Moreover, in the embodiment shown in FIG. 12 , a pinch roll 35 configured to pinch the strip S together with the deflector roll 6 is provided above the deflector roll 6 .

In the exemplary embodiment shown in FIG. 12, the cross section of the forming portion 36 has a circular shape, but the shape of the forming portion 36 is not limited to this. For example, the cross-sectional shape of the forming portion 36 may be rectangular, polygonal, home base, elliptical, or the like.

In this embodiment, the strip S is sandwiched between the deflector rolls 6 and the pinch rolls 33, and the strip S is sandwiched between the forming section 36 and the receiving section 38. By moving the forming section 36 downward, is applied to the strip S, the rolling rolls 15 and 16 are rotated. Thereby, the shape of the tail end portion Sa of the strip S can be corrected.

In some embodiments, the rotation control unit 52 may be configured to repeatedly rotate and stop the rolling rolls 15 and 16 while the pressing unit 30 is applying a pressing force to the strip S. .

According to the above-described embodiment, since the pair of rolling rolls 15 and 16 are repeatedly rotated and stopped while the pressing portion 30 is applying a pressing force to the strip S, the position of the strip S is It is possible to correct the shape of the tail end while shifting little by little. This makes it possible to finely adjust the shape of the tail end.

13A to 13D are for explaining an example of a procedure for correcting the shape of the tail end portion Sa while repeating rotation and stop of the rolling rolls 15 and 16 (that is, while inching the strip S). It is a diagram. In this example, the pressing portion 30 shown in FIG. 12 is used to correct the shape of the tail end portion Sa of the strip S. As shown in FIG.

First, as shown in FIG. 13A , at the position of the forming portion 36 in the direction of travel, the vertical position (height) of the strip S is approximately the same as that of the strip S between the rolling rolls 15 and 16 . Then, the position of the forming part 36 is adjusted. In this state, the strip S is sandwiched between the forming portion 36 and the receiving portion 38, and while the pressing force from the forming portion 36 is applied to the strip S, the rolling rolls 15 and 16 are slightly rotated and stopped.

Next, as shown in FIG. 13B, the position of the forming portion 36 is adjusted to a lower position than in FIG. 13A. In this state, the strip S is sandwiched between the forming portion 36 and the receiving portion 38, and while the pressing force from the forming portion 36 is applied to the strip S, the rolling rolls 15 and 16 are slightly rotated and stopped.

Furthermore, as shown in FIG. 13C, the position of the forming part 36 is adjusted to a lower position than in the case of FIG. 13B. In this state, the strip S is sandwiched between the forming portion 36 and the receiving portion 38, and while the pressing force from the forming portion 36 is applied to the strip S, the rolling rolls 15 and 16 are slightly rotated and stopped. Thus, by increasing the pressing amount (pressing down amount) of the forming portion 36, it is possible to effectively correct the shape of the portion of the strip S near the tail end St, which has a stronger tendency to curl.

When the tail end St of the strip S passes over the deflector roll 6 and the forming part 36, as shown in FIG. Application of the pressing force to S may be released.

In this manner, the rolling rolls 15 and 16 are slightly moved while the forming section 36 is appropriately moved in accordance with the change in the shape of the tail end portion Sa, and the pressing force from the forming section 36 is applied to the strip S. By repeating the procedure of rotating and stopping, it is possible to effectively correct the shape of the tail end portion Sa while shifting the position of the strip S little by little.

The outlines of the rolling mill control device, the rolling equipment, and the rolling mill control method according to some embodiments will be described below.

(1) A control device (50) of a rolling mill (1) according to at least one embodiment of the present invention,
A pair of rolling rolls (15, 16) for rolling a metal strip (S), an unwinding machine (2) for unwinding the strip toward the pair of rolling rolls, and the pair of A control device for controlling a rolling device including a winder (3) for winding the strip rolled by the rolling rolls,
a rotation control unit (52) for controlling the rotation of the rolling rolls;
a velocity acquisition unit (54) configured to acquire the velocity of the strip between the unwinder and the rolling rolls;
a detachment detector (56) configured to detect that the trailing end (St) of the strip is detached from the unwinder;
with
The rotation control unit is configured based on the detachment timing, which is the timing at which detachment of the tail end from the unwinder is detected by the detachment detection unit, and the speed of the strip acquired by the speed acquisition unit. , configured to stop the rotation of the pair of rolling rolls.

According to the above configuration (1), the rotation of the rolling mill is based on the timing at which the separation of the tail end of the strip from the unwinder is detected and the speed of the strip between the unwinder and the rolling rolls. is controlled to stop the strip, the strip can be stopped at an appropriate position (for example, a position where the rolling of the next pass can be started smoothly). Therefore, in the reverse-type rolling mill, even after the trailing edge is separated from the unwinder, rolling can be continued until the rolling mill stops, and rolling of the next pass can be started smoothly. Therefore, the yield can be improved while suppressing an increase in the time required for rolling.

(2) In some embodiments, in the configuration of (1) above,
The detachment detection unit detects detachment of the tail end from the unwinder based on a signal from a sensor (42) capable of detecting the presence or absence of the strip at a position above or below the unwinder. configured to

According to the above configuration (2), the separation of the tail end from the unwinder can be detected appropriately by the sensor capable of detecting the presence or absence of the strip at the position above or below the unwinder. Therefore, as described in (1), the yield can be improved while suppressing an increase in the time required for rolling.

(3) In some embodiments, in the configuration of (2) above,
The rolling mill includes a guide section (12) for guiding the strip between the unwinder and the pair of rolling rolls,
The detachment detection unit detects the presence or absence of the strip at a position that is the same as or closer to the unwinding machine than the guide in the traveling direction of the strip and above or below the unwinding machine. is configured to detect detachment of the tail end from the unwinder based on a signal from a sensor (42) capable of detecting .

The passage of the band plate in the guide part usually has a narrow gap in the plate thickness direction, making it relatively difficult to pass the tip of the band plate through. In this respect, according to the above configuration (3), the sensor that can detect the presence or absence of the strip at a position that is the same as the guide portion or closer to the unwinder than the guide portion in the traveling direction of the strip is used to unwind the strip. Since the separation of the trailing end from the machine is detected, the trailing end of the strip (that is, the leading end of the next pass) can be easily stopped at the same position as the guide section or closer to the unwinding machine side than the guide section. Therefore, it becomes easier to smoothly start rolling in the next pass.

(4) In some embodiments, in the configuration of (2) or (3) above,
The detachment detection unit determines that the tail end has detached from the unwinder when the presence of the strip is detected at a position below the unwinder based on the signal from the sensor. configured to

According to the configuration (4) above, since the separation of the trailing strip from the unwinder is detected based on the presence of the strip at the position below the unwinder, the strip is released from the unwinder. can be determined quickly.

(5) In some embodiments, in the configuration of (2) or (3) above,
The detachment detection section detects that the strip plate is no longer present at a position above the unwinding machine based on the signal from the sensor, and the tail end is removed from the unwinding machine. It is configured to determine that it has left.

According to the above configuration (5), since the separation of the tail end from the unwinding machine is detected based on the absence of the strip at the position above the unwinding machine, the strip is unwound. Detachment from the aircraft can be determined relatively quickly.

(6) In some embodiments, in the configuration of any one of (1) to (5) above,
The rotation control unit controls the length of the strip from the position of the tail end at the release timing to the planned stop position of the tail end in addition to the release timing and the speed of the strip. is configured to stop the rotation of the rolling rolls.

According to the above configuration (6), in addition to the release timing of the tail end from the unwinder and the speed of the strip, Since the rotation of the rolling rolls is stopped based on the length of the strip, the strip can be stopped so that the trailing end is positioned at a desired position (predicted stop position). Therefore, it becomes easier to smoothly start rolling in the next pass.

(7) In some embodiments, in the configuration of any one of (1) to (6) above,
The control device is
A grip control unit (58) for controlling a gripper (22) provided in the unwinding machine for gripping a tail end (Sa) including the tail end of the strip,
The gripping control unit is configured to release the gripping of the tail end by the gripper immediately before the tail end is separated from the unwinder.

　While the gripper of the unwinder grips the tail end of the strip, tension acts on the strip, so the portion of the strip that is rolled during this period can become a product. In this respect, according to the above configuration (7), the gripping of the tail end portion by the gripper is released immediately before the tail end is separated from the unwinder, so that the tail end is held until just before the tail end is separated from the unwinder. The tension acting on the strip can be maintained. Therefore, the yield can be improved more effectively.

(8) In some embodiments, in the configuration of (7) above,
The gripping control unit is configured to release gripping of the trailing end by the gripper while the strip is wound around the unwinder more than once.

The tail end of the strip can be detached from the unwinder when the strip is wrapped around the unwinder by one turn or less. In this regard, according to the above configuration (8), the gripper grips the tail end portion of the strip before the tail end of the strip becomes detachable from the unwinder and immediately before the tail end is detached from the unwinder. Since it is released, the tail end of the strip can be smoothly removed from the unwinder, and the tension acting on the strip is maintained until just before the tail end is separated from the unwinder, improving the yield. can do.

(9) In some embodiments, in the configuration of (7) or (8) above,
The gripping control unit is configured to release gripping of the tail end portion by the gripper while the strip is wound around the unwinder by two turns or less.

According to the above configuration (9), since the grip of the tail end portion by the gripper is released while the band plate is wound around the unwinder by two turns or less, the tail end is separated from the unwinder. The tension acting on the strip can be maintained until just before. Therefore, the yield can be improved more effectively.

(10) In some embodiments, in any of the above configurations (7) to (9),
The rotation control section is configured to reduce the rotation speed of the pair of rolling rolls in a period including the timing at which the gripping of the tail end portion is released by the gripping control section.

According to the configuration (10) above, since the rotation speed of the rolling rolls is reduced when the gripping of the trailing end is released, the rolling rolls rotate until immediately before the trailing end is released from the gripping. Velocity remains relatively high. Therefore, an increase in the time required for rolling can be effectively suppressed.

(11) In some embodiments, in the configuration of any one of (1) to (10) above,
The rolling apparatus includes a deflector roll (6) provided between the unwinder and the pair of rolling rolls, and at least a deflector roll (6) closer to the pair of rolling rolls than the deflector roll in the traveling direction of the strip. a pressing part (30) located partially for applying a pressing force along the thickness direction of the strip to the strip,
The control device is
A pressing control part (60) configured to operate the pressing part so as to apply a pressing force to the strip plate after the tail end is separated from the unwinding machine,
The rotation control section is configured to rotate the pair of rolling rolls while the pressing section applies a pressing force to the strip.

The tail end of the strip removed from the unwinder usually has a relatively large curved shape (strong curl). According to the above configuration (11), after the tail end is separated from the unwinder, the rolling rolls are rotated while a pressing force is applied to the strip by the pressing portion provided near the deflector roll. , the degree of curvature of the tail end can be reduced. By correcting the shape of the trailing edge of the strip in this way, for example, the leading edge of the strip in the next pass (the trailing edge of the previous pass) can be gripped by the gripper of the winder (unwinder in the previous pass). Rolling in the next pass can be started more smoothly. Therefore, it is possible to effectively suppress an increase in the time required for rolling.

(12) In some embodiments, in the configuration of (11) above,
The rotation control section is configured to repeatedly rotate and stop the pair of rolling rolls while the pressing section applies a pressing force to the strip.

According to the configuration (12) above, since the pair of rolling rolls are repeatedly rotated and stopped while the pressing portion is applying a pressing force to the strip, the position of the strip is shifted little by little. It is possible to correct the shape of the tail end. This makes it possible to finely adjust the shape of the tail end.

(13) The rolling facility (100) according to at least one embodiment of the present invention is
A pair of rolling rolls (15, 16) for rolling a metal strip (S), an unwinding machine (2) for unwinding the strip toward the pair of rolling rolls, and the pair of a rolling mill (1) comprising a winding machine (3) for winding the strip rolled by the rolling rolls;
a control device (50) according to any one of (1) to (12) above for controlling the rolling mill;
Prepare.

According to the above configuration (13), the rotation of the rolling mill is based on the timing at which the separation of the tail end of the strip from the unwinder is detected and the speed of the strip between the unwinder and the rolling rolls. is controlled to stop the strip, the strip can be stopped at an appropriate position (for example, a position where the rolling of the next pass can be started smoothly). Therefore, in the reverse-type rolling mill, even after the trailing edge is separated from the unwinder, rolling can be continued until the rolling mill stops, and rolling of the next pass can be started smoothly. Therefore, the yield can be improved while suppressing an increase in the time required for rolling.

(14) A method for controlling a rolling mill according to at least one embodiment of the present invention includes:
A pair of rolling rolls (15, 16) for rolling a metal strip (S), an unwinding machine (2) for unwinding the strip toward the pair of rolling rolls, and the pair of A control method for controlling a rolling device (1) including a winding machine (3) for winding the strip rolled by the rolling rolls,
A rotation control step (S8) for controlling the rotation of the rolling rolls;
a speed acquisition step (S4) of acquiring the speed of the strip between the unwinder and the rolling roll;
a detachment detection step (S6) for detecting that the trailing edge of the strip is detached from the unwinder;
with
In the rotation control step, based on the detachment timing, which is the timing at which detachment of the tail end from the unwinder is detected in the detachment detection step, and the speed of the strip obtained in the speed obtaining step. , to stop the rotation of the pair of rolling rolls.

According to the above method (14), the rotation of the rolling mill is based on the timing at which the separation of the tail end of the strip from the unwinder is detected and the speed of the strip between the unwinder and the rolling rolls. is controlled to stop the strip, the strip can be stopped at an appropriate position (for example, a position where the rolling of the next pass can be started smoothly). Therefore, in the reverse-type rolling mill, even after the trailing edge is separated from the unwinder, rolling can be continued until the rolling mill stops, and rolling of the next pass can be started smoothly. Therefore, the yield can be improved while suppressing an increase in the time required for rolling.

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 Mill 2 Unwinding Machine 3

Winding Machines

4, 5

Mandrels

6, 7

Deflector Rolls

8, 9 Guide Table 10 Rolling Mill 11

Motors

12, 13

Guide Parts

15, 16

Rolling Rolls

17, 18

Intermediate Rolls

19, 20

Backup Rolls

22, 23 Gripper 24 Slot 30 Pressing part 32 Pinch roll 33 Pinch roll 34 Push roll 35 Pinch roll 36 Forming part 38 Receiving part 38a Contact surface 40

Speed sensors

42, 42A to 42C Sensor 50 Control device 52 Rotation control part 54 Speed acquisition Part 56 Separation detection part 58 Gripping control part 60 Pressing control part 100 Rolling equipment S Strip Sa Tail end St Tail end

Claims

A pair of rolling rolls for rolling a metal strip, an unwinder for unwinding the strip toward the pair of rolling rolls, and a winding of the strip rolled by the pair of rolling rolls. A control device for controlling a rolling mill comprising a winder for taking up,
a rotation control unit for controlling the rotation of the rolling rolls;
a speed acquisition unit configured to acquire the speed of the strip between the unwinder and the rolling roll;
a detachment detection unit configured to detect that the tail end of the strip is detached from the unwinder;
with
The rotation control unit is configured based on the detachment timing, which is the timing at which detachment of the tail end from the unwinder is detected by the detachment detection unit, and the speed of the strip acquired by the speed acquisition unit. , a control device for a rolling mill configured to stop the rotation of the pair of rolling rolls.
The detachment detection unit detects detachment of the tail end from the unwinder based on a signal from a sensor capable of detecting the presence or absence of the strip at a position above or below the unwinder. 2. A control device for a rolling mill according to claim 1.
The rolling device includes a guide section for guiding the strip between the unwinder and the pair of rolling rolls,
The detachment detection unit detects the presence or absence of the strip at a position that is the same as or closer to the unwinding machine than the guide in the traveling direction of the strip and above or below the unwinding machine. 3. The control device for a rolling mill according to claim 2, wherein separation of said tail end from said unwinder is detected based on a signal from a sensor capable of detecting .
The detachment detection unit determines that the tail end has detached from the unwinder when the presence of the strip is detected at a position below the unwinder based on the signal from the sensor. 4. A control device for a rolling mill according to claim 2 or 3, configured to:
The detachment detection section detects that the strip plate is no longer present at a position above the unwinding machine based on the signal from the sensor, and the tail end is removed from the unwinding machine. 4. A control device for a rolling mill according to claim 2 or 3, configured to determine that the rolling mill has detached.
The rotation control unit controls the length of the strip from the position of the tail end at the release timing to the planned stop position of the tail end in addition to the release timing and the speed of the strip. 6. A control device for a rolling mill according to claim 1, configured to stop the rotation of the rolling mill rolls.
A gripping control unit for controlling a gripper provided in the unwinding machine for gripping a tail end including the tail end of the strip plate,
7. The grip control unit according to any one of claims 1 to 6, wherein the grip control unit is configured to release the grip of the tail end by the gripper immediately before the tail end is separated from the unwinder. Rolling mill controller.
8. The rolling mill according to claim 7, wherein the gripping control unit is configured to release gripping of the trailing end portion by the gripper while the strip is wound around the unwinder more than once. Control device.
9. The rolling mill according to claim 7, wherein the gripping control unit is configured to release gripping of the trailing end portion by the gripper while the strip is wound around the unwinder by two turns or less. controller.
10. The rotation control section according to any one of claims 7 to 9, wherein the rotation control section is configured to decelerate the rotational speed of the pair of rolling rolls in a period including a timing at which the gripping of the tail end portion is released by the gripping control section. 1. A control device for a rolling mill according to claim 1.
The rolling device includes a deflector roll provided between the unwinder and the pair of rolling rolls, and a deflector roll positioned at least partially toward the pair of rolling rolls relative to the deflector roll in the traveling direction of the strip. and a pressing part for applying a pressing force along the thickness direction of the strip plate to the strip plate,
A pressing control unit configured to operate the pressing unit so that the pressing unit applies a pressing force to the strip plate after the tail end is separated from the unwinder,
11. The rotation control unit according to any one of claims 1 to 10, wherein the rotation control unit is configured to rotate the pair of rolling rolls while the pressing unit applies a pressing force to the strip. Rolling mill controller.
12. The rolling mill according to claim 11, wherein the rotation control unit is configured to repeat rotation and stop of the pair of rolling rolls while a pressing force is applied to the strip by the pressing unit. Control device.
A pair of rolling rolls for rolling a metal strip, an unwinder for unwinding the strip toward the pair of rolling rolls, and a winding of the strip rolled by the pair of rolling rolls. a rolling device including a winder for taking off;
a control device according to any one of claims 1 to 12 for controlling the rolling mill;
rolling equipment.
A pair of rolling rolls for rolling a metal strip, an unwinder for unwinding the strip toward the pair of rolling rolls, and a winding of the strip rolled by the pair of rolling rolls. A control method for controlling a rolling mill comprising:
a rotation control step of controlling the rotation of the rolling roll;
a speed obtaining step of obtaining the speed of the strip between the unwinder and the rolling roll;
a separation detection step of detecting separation of the tail end of the strip from the unwinder;
with
In the rotation control step, based on the detachment timing, which is the timing at which detachment of the tail end from the unwinder is detected in the detachment detection step, and the speed of the strip obtained in the speed obtaining step. and a method of controlling a rolling mill for stopping the rotation of the pair of rolling rolls.