JP7150994B2 - 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 the rolling of a metal plate using a rolling mill including a pair of rolling rolls, the metal plate is rolled in a state in which the tension on the delivery side of the rolling mill does not act on the metal plate before the leading end portion of the metal plate is wound on the winder. Rolling (rolling without tension at the tip) may be performed.

For example, in Patent Document 1, a rolling mill (rolling roll) and a tension reel (winding machine) provided on the delivery side of the rolling mill are used, and a rolled material (metal plate) is tensioned. Rolling is described before it is wound onto a reel and the tension on the exit side of the rolling mill is established. In addition, in Patent Document 1, a meandering detector is provided upstream of the tension reel on the delivery side of the rolling mill, and the offset amount detected by the meandering detector (the axial center position of the rolling roll and the plate of the rolled material) It is described that leveling control of the rolling mill is performed based on the difference from the center position in the width direction. As a result, it is intended to improve the yield by suppressing meandering and biased elongation of the rolled material, which may be caused by rolling in a state where there is no delivery-side tension.

JP-A-11-179414

As described above, in the tension-free state at the leading end where the tension on the delivery side does not act on the metal plate, the width of the metal plate is determined by using the position sensor (the meandering detector in Patent Document 1) provided on the delivery side of the rolling rolls. It is possible to detect the position of a predetermined part in the direction (center position or strip end position) and control the rolling mill based on the detected value. However, even if the position of the predetermined portion in the width direction of the metal plate to be detected deviates from the specified position at the position of the rolling mill (for example, the center position in the width direction of the metal plate is the center in the axial direction of the roll) However, if the direction of the metal sheet flowing out of the rolls is tilted from the conveying direction of the rolling mill for some reason, the position detected by the position sensor may coincide with the above-mentioned specified position. obtain. In this case, it is not possible to appropriately grasp that the outflow direction of the metal plate is tilted from the detection result by the position sensor. Therefore, if rolling is continued in this state, the leading end of the metal sheet may be separated from the conveying line of the rolling mill in the sheet width direction, and the rolled metal sheet may not be properly wound by the winding device. be.

In view of the above circumstances, at least one embodiment of the present invention provides a control device and rolling equipment for a rolling mill capable of appropriately winding a metal sheet rolled in a tension-free state with a winding device, and rolling The object is to provide a method of operating the device.

A control device for a rolling mill according to at least one embodiment of the present invention comprises:
A control device for controlling a rolling mill including a pair of rolling rolls provided to sandwich a metal plate,
A first plate provided on the entry side of the pair of rolling rolls in the conveying direction of the metal plate and configured to detect a plate end position in the width direction of the metal plate at a first position in the conveying direction. an edge detector;
A second plate end detection unit provided on the delivery side of the pair of rolling rolls in the conveying direction and configured to detect a plate end position in the plate width direction of the metal plate at a second position in the conveying direction. When,
Based on the first plate end position of the metal plate detected by the first plate end detection unit and the second plate end position of the metal plate detected by the second plate end detection unit, the a determination unit configured to determine whether or not to start tension-free rolling at the front end, which is rolling of the metal plate by the pair of rolling rolls in a state where the tension on the delivery side of the metal plate is zero;
Prepare.

According to at least one embodiment of the present invention, there is provided a control device for a rolling mill, a rolling equipment, and a method for operating a rolling mill that can appropriately wind a metal sheet rolled in a tension-free state by a winding device. provided.

1 is a schematic configuration diagram of a rolling facility equipped with a control device according to one embodiment; FIG. 1 is a schematic configuration diagram of a rolling facility equipped with a control device according to one embodiment; FIG. 1 is a schematic configuration diagram of a controller that constitutes a control device according to an embodiment; FIG. 4 is a flow chart showing an example of a method of operating a rolling mill according to one embodiment. FIG. 4 is a schematic diagram showing the states of the rolling rolls and the metal plate when tension-free rolling of the leading edge of the metal plate is started. FIG. 4 is a schematic diagram showing the states of the rolling rolls and the metal plate when tension-free rolling of the leading edge of the metal plate is started. FIG. 4 is a schematic diagram showing the states of the rolling rolls and the metal plate when tension-free rolling of the leading edge of the metal plate is started. It is a figure for demonstrating determination of the start propriety of tension-free rolling of an edge by a determination part. It is a figure for demonstrating determination of the start propriety of tension-free rolling of an edge by a determination part. It is a mimetic diagram showing a partial cross section containing a board width direction and a longitudinal direction of a metal plate rolled with rolling equipment concerning one embodiment. It is a graph which shows an example of the graph which shows the relationship between the gap between rolls and time. It is a graph which shows an example of the graph which shows the relationship between the gap between rolls and time. 4 is a flow chart showing an example of a method of operating a rolling mill according to one embodiment. FIG. 12 is a diagram showing the state transition of the metal plate when the rolling mill is operated based on the flowchart shown in FIG. 11; FIG. 12 is a diagram showing the state transition of the metal plate when the rolling mill is operated based on the flowchart shown in FIG. 11; FIG. 12 is a diagram showing the state transition of the metal plate when the rolling mill is operated based on the flowchart shown in FIG. 11; FIG. 12 is a diagram showing the state transition of the metal plate when the rolling mill is operated based on the flowchart shown in FIG. 11; It is a graph for demonstrating an example of the calculation method of the 1st difference in expansion of a metal plate, and a 2nd difference in expansion. 4 is a flow chart showing an example of a method of operating a rolling mill according to one embodiment. 15 is a diagram showing the state transition of the metal plate when the rolling mill is operated based on the flowchart shown in FIG. 14; FIG. 15 is a diagram showing the state transition of the metal plate when the rolling mill is operated based on the flowchart shown in FIG. 14; FIG. 15 is a diagram showing the state transition of the metal plate when the rolling mill is operated based on the flowchart shown in FIG. 14; FIG. 15 is a diagram showing the state transition of the metal plate when the rolling mill is operated based on the flowchart shown in FIG. 14; FIG.

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.
1 and 2 are schematic configuration diagrams of a rolling facility equipped with a control device according to one embodiment, respectively. As shown in FIGS. 1 and 2 , the rolling equipment 1 includes a rolling mill 2 and a control device 100 for controlling the rolling mill 2 . In some embodiments, the rolling mill 2 may include one rolling mill 10, for example as shown in FIG. 1, or two rolling mills 10 (10A, 10B), for example as shown in FIG. may be included, or three or more rolling mills 10 may be included.

The rolling mill 2 shown in FIG. 1 is a rolling mill (reverse mill) that reciprocates and rolls a metal plate 90 passed between a pair of rolling rolls 15 and 16 . The rolling mill 2 shown in FIG. 15 and 16, and a winding device 14 provided on the exit side of the rolling rolls 15 and 16 in the traveling direction of the metal plate 90. Rolls 15 and 16 are configured to roll.

The rolling mill 2 shown in FIG. 2 is a rolling mill (reverse mill) that reciprocates and rolls a metal plate 90 passed between a pair of first rolling rolls 15A and 16A and between a pair of second rolling rolls 15B and 16B. is. The rolling mill 2 shown in FIG. 2 includes a first rolling mill 10A including a pair of first rolling rolls (work rolls) 15A and 16A provided so as to sandwich a metal plate 90, which is a rolling material, and a first rolling mill 10A that sandwiches the metal plate 90. A second rolling mill 10B including a pair of second rolling rolls (work rolls) 15B and 16B provided in the second rolling mill 10B, and an unwinding device 4 provided on the entrance side of the first rolling rolls 15A and 16A in the traveling direction of the metal plate 90 and a winding device 14 provided on the exit side of the second rolling rolls 15B and 16B in the traveling direction of the metal plate 90, and winding the metal plate 90 on the pair of first rolling rolls 15A and 16A and the pair of second rolling rolls 15A and 16A. It is configured to be rolled by rolling rolls 15B and 16B.

The rolling mills 10, 10A and 10B shown have the same configuration. Although the configuration of the rolling mill 10 will be described below, the same description applies to the rolling mills 10A and 10B. In FIG. 2, the constituent elements (rolling rolls, etc.) of the rolling mills 10A and 10B are denoted by the same reference numerals as those of the rolling mill 10 shown in FIG. Have been described.

In addition to a pair of rolling rolls (work rolls) 15 and 16, the rolling mill 10 includes a pair of intermediate rolls 17 and 18 and a pair of intermediate rolls 17 and 18 provided on opposite sides of the pair of rolling rolls 15 and 16, respectively. and a pair of backup rolls 19,20. Intermediate rolls 17,18 and backup rolls 19,20 are configured to support mill rolls 15,16. The rolling mill 10 also includes a screw down device 22 for applying a load to the pair of rolling rolls 15 and 16 to roll down the metal plate 90 sandwiched between the pair of rolling rolls 15 and 16 . The screw down device 22 may include a hydraulic cylinder.

A motor (not shown) is connected to the rolling rolls 15 and 16 via a spindle (not shown) or the like, and the rolling rolls 5 and 16 are rotationally driven by the motor. When rolling the metal plate 90, the rolling rolls 15 and 16 are rotated by the motor while the rolling device 22 rolls down the metal plate 90, thereby generating a frictional force between the rolling rolls 15 and 16 and the metal plate 90. The metal plate 90 is sent to the delivery side of the rolling rolls 15 and 16 by frictional force.

The unwinding device 4 is configured to unwind the metal sheet 90 toward the rolling mill 10 . The winding device 14 is configured to wind the metal sheet 90 from the rolling mill 10 . The unwinding device 4 and the winding device 14 are each driven by a motor (not shown).

The unwinding device 4 is configured to apply entry-side tension to the metal plate 90 when the metal plate 90 is rolled. In addition, the winding device 14 is configured to apply a delivery-side tension to the metal plate 90 when rolling the metal plate 90 . That is, by appropriately driving the unwinding device 4 and the winding device 14 by the motor, the metal plate 90 is provided with tension on the entry side and tension on the exit side. Meandering of the metal plate 90 during rolling can be suppressed by appropriately applying an entry-side tension and an exit-side tension to the metal plate 90 .

The rolling is stopped just before the tail end of the metal plate 90 unwound from the unwinding device 4, and when the odd-numbered rolling (first pass, etc.) is completed while the metal plate 90 is pressed down by the rolling rolls 15 and 16, Next, the metal sheet 90 is unwound from the winding device 14 toward the rolling mill 10, and while being wound up by the unwinding device 4, the metal plate 90 is advanced in the direction opposite to that previously. and perform even-numbered rolling (second pass, etc.). 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 90 .

The rolling mill 2 shown in FIGS. 1 and 2 includes an entry-side pinch roll 6 and a side guide 8 for guiding a metal plate 90 introduced into the rolling mill 10 from the unwinding device 4, and a winding device from the rolling mill 10. and an exit pinch roll 12 for guiding the metal sheet 90 fed to 14 .

As shown in FIGS. 1 and 2, a control device 100 for controlling the rolling mill 2 includes a first plate edge detector 32 for detecting a plate edge position in the width direction of a metal plate 90, a second plate An edge detector 34 and a controller 40 configured to control the operation of the rolling mill 2 based on the detection results of the first strip edge detector 32 and the second strip edge detector 34 .

The first plate edge detection unit 32 is provided on the entry side of the pair of rolling rolls 15 and 16 in the conveying direction of the metal plate 90, and detects a plate edge position in the width direction of the metal plate at a first position Y1 in the conveying direction. It is configured to detect a certain first plate edge position x1. The second plate edge detector 34 is provided on the delivery side of the pair of rolling rolls 15 and 16 in the conveying direction, and is the second plate edge position in the plate width direction of the metal plate at the second position Y2 in the conveying direction. It is configured to detect the end position x2.

Note that the control device 100 shown in FIG. 2 is provided with the first strip edge detectors 32A and 32B on the inlet side in the conveying direction for the first rolling rolls 15A and 16A and the second rolling rolls 15B and 16B, respectively. , and second plate end detection units 34A and 34B are provided on the delivery side in the conveying direction.

The controller 40 receives signals indicating measurement results from the first strip edge detection unit 32 and the second strip edge detection unit 34, and drives the screw down device 22 and the rolling rolls 15 and 16 based on these measurement results. is configured to control the operation of the motor of

The controller 40 may include a CPU, memory (RAM), auxiliary storage, interface, and the like. The controller 40 receives signals from the first strip edge detection section 32 and the second strip edge detection section 34 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 content of the controller 40 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.

FIG. 3 is a schematic configuration diagram of the controller 40 that configures the control device 100 according to one embodiment. As shown in FIG. 3 , the controller 40 includes a determination section 42 and a rolling control section 44 . The determination unit 42 determines the first plate end position x1 of the metal plate 90 detected by the first plate end detection unit 32 and the second plate end position x1 of the metal plate 90 detected by the second plate end detection unit 34. Based on the position x2, it is configured to determine whether or not to start rolling of the metal plate 90 by the pair of rolling rolls 15 and 16 in a state where the tension on the delivery side of the metal plate 90 is zero (tensionless rolling at the leading end). . The rolling control section 44 is configured to control the operation of the pair of rolling rolls 15 and 16 . More specifically, the rolling control unit 44 is configured to control motors for driving the reduction device 22 and the rolling rolls 15 and 16 in order to adjust the inter-roll gap and the rotational speed of the rolling rolls 15 and 16. be.
Each unit of the controller 40 other than the determination unit 42 will be described later.

Note that the control device 100 may further include a display unit (such as a display; not shown) for displaying the determination result by the determination unit 42 .

The operation control of the rolling mill 2 by the control device 100 will be described below, but the rolling mill 2 may be operated by manually performing part or all of the processing by the control device 100 described below.

FIG. 4 is a flow chart showing an example of a method of operating the rolling mill 2 according to one embodiment. FIG. 4 is a flow chart showing an example of an operation method up to the start of tensionless rolling of the leading end of the metal plate 90. As shown in FIG. The operation method after starting tensionless rolling of the leading end of the metal plate 90 will be described later with reference to the flow charts of FIGS. 11 and 14 and the like.
5A to 5C are schematic diagrams showing the states of the rolling rolls 15 and 16 and the metal plate 90 when tension-free rolling of the metal plate 90 is started. FIGS. 6 and 7 are diagrams for explaining how the determining unit 42 determines whether or not tension-free rolling at the tip can be started.

In one embodiment, as shown in FIG. The positions of the rolling rolls 15 and 16 are adjusted (step S102). At this time, the position of the pair of rolling rolls 15 and 16 may be adjusted by operating the screw down device 22 as necessary. Then, while maintaining the gap between the rolls larger than the plate thickness, the leading end portion (see FIG. 5A) including the leading end 91 of the metal plate 90 is passed between the pair of rolling rolls 15 and 16 (step S104).

FIG. 5A is a schematic diagram showing the state of the rolling rolls 15 and 16 and the metal plate 90 when step S104 is completed. As shown in FIG. 5A, at the completion of step S104, the gap d0 between the pair of rolling rolls 15 and 16 is larger than the thickness H0 of the metal plate 90 before rolling, and the tip 91 of the metal plate 90 is rolled. The leading end portion including is passed between the mill rolls 15,16. Further, the leading end portion of the metal plate 90 including its leading end 91 is located on the delivery side of the rolling rolls 15 and 16 and does not reach the winding device 14 . Therefore, the delivery side tension Td acting on the metal plate 90 is zero. At this point, the entry-side tension Te is not applied to the metal plate 90, so the entry-side tension Te is also zero.

Next, the first plate edge detection unit 32 is used to detect the first plate edge position x1 at the first position Y1 in the conveying direction, and the second plate edge detector 34 is used to detect the second position in the conveying direction. A second plate edge position x2 at Y2 is detected (step S106).

Here, FIGS. 6 and 7 are schematic plan views of the rolling rolls 15 and 16 and the metal plate 90 before the start of rolling, respectively. As shown in FIGS. 6 and 7, the metal plate 90 has a plate width W and has a first edge 92 and a second edge 93 which are both edges in the plate width direction. In some embodiments, the first plate edge detector 32 and the second plate edge detector 34 detect the first position Y1 and the second position Y2 as the first plate edge position x1 and the second plate edge position x2, respectively. (see FIGS. 6 and 7). Alternatively, in another embodiment, the first board end detection unit 32 and the second board end detection unit 34 respectively detect the first position Y1 and the second position Y1 as the first board end position x1 and the second board end position x2. It may be configured to detect the position of the second edge 93 at Y2.

Then, after step S106, the determination unit 42 determines whether or not to start tension-free rolling of the leading end of the metal plate 90 based on the first plate end position x1 and the second plate end position x2 detected in step S106. (Step S108).

In step S108, for example, when the longitudinal direction of the metal plate 90 is substantially parallel to the conveying direction of the metal plate 90 by the rolling mill 2 (see FIG. 6), it is determined that tension-free rolling of the leading end of the metal plate 90 can be started. However, when the inclination of the longitudinal direction of the metal plate 90 with respect to the conveying direction of the metal plate 90 is equal to or greater than a specified degree (see FIG. 7), it is determined that tensionless rolling of the leading end of the metal plate 90 cannot be started.

More specifically, in one embodiment, in step S108, when the difference |x1-x2| between the first plate end position x1 and the second plate end position _x2 is equal to or less than the threshold It is determined that tension-free rolling can be started, and when the difference |x1-x2| is larger than the threshold value Δx _th1 , it is determined that tension-free rolling of the tip end of the metal plate 90 cannot be started.

Alternatively, in one embodiment, in step S108, the difference (x1−x _ref ) between the reference position x _ref and the first plate end position x1 in the plate width direction of the metal plate 90, and the reference position x _ref and the second plate When each of the differences (x2-x _ref ) from the end position x2 is equal to or less than the threshold value x _th2 , it is determined that tension-free rolling of the tip end of the metal plate 90 can be started, and the difference (x1-x _ref ) or ( x2−x _ref ) is larger than the threshold value x _th2 , it is determined that the tip tension-free rolling of the metal plate 90 cannot be started.

Here, the above reference position x _ref is the plate width direction (that is, the It is a specified position in the axial direction (the direction of the central axis O). The reference position x _ref described above may be, for example, the central position in the axial direction of the rolling rolls 15 and 16 (see FIGS. 6 and 7). In FIG. 6, the longitudinal direction of the metal plate 90 coincides with the conveying direction of the rolling rolls, and at this time, the position of the center line Lc along the longitudinal direction of the metal plate 90 is the width direction ( That is, it coincides with the reference position x _ref in the axial direction of the rolling rolls 15 and 16).

In step S108 described above, if it is determined that the leading edge tension-free rolling of the metal plate 90 cannot be started (No in step S108), the position of the metal plate 90 in the plate width direction is corrected (step S110), and step S110 is performed again. Returning to S106, detection of the first plate end position x1 and the second plate end position x2 (step S106), and determination of whether or not tension-free rolling of the tip end of the metal plate 90 can be started based on the detection result in step S106 (step S108) is performed.

On the other hand, if it is determined in step S108 that tension-free rolling of the leading end of the metal plate 90 can be started (Yes in step S108), the rolling control unit 44 starts tension-free rolling of the leading end of the metal plate 90 ( step S112).

In step S112, the metal plate 90 is pressed down by the pair of rolling rolls 15 and 16 in a state where the tension Td on the delivery side applied to the metal plate 90 is zero, and the rolling of the pair of rolling rolls 15 and 16 is started. Begin tensionless tip rolling of plate 90 (see FIG. 5B).

When rolling down the metal plate 90 with the pair of rolling rolls 15 and 16, the rolling device 22 is operated so that the gap between the rolls becomes the value d1 corresponding to the target plate thickness, as shown in FIG. 5B. The inter-roll gap d1 at this point is smaller than the plate thickness H0 of the metal plate 90 before being rolled. Further, when and after the rolling rolls 15 and 16 start rotating, the rotational speed of the rolling rolls 15 and 16 is adjusted to an appropriate value by adjusting the current value of the motor for driving the rolling rolls 15 and 16. .

When tip tension rolling of the metal plate 90 is started, the metal plate 90 advances in the direction of the arrow shown in FIG. 5B. Then, as shown in FIG. 5C, after the start of rolling, the portion of the metal plate 90 that has been rolled down by the rolling rolls 15 and 16 and progressed to the delivery side of the rolling rolls 15 and 16 has a thickness H0 greater than the plate thickness H0 before rolling. It has a thin plate thickness H1.

In this way, by performing tension-free rolling of the tip of the metal plate 90, the tip of the metal plate 90 is reduced in comparison with the case where the tip of the metal plate 90 is wound around a winding device and rolling is started in a state where the tension on the delivery side is applied. Rolling can be started from a portion close to , and the yield of the metal plate 90 can be improved.

Then, as described above, after it is determined in step S108 that tension-free rolling at the tip of the metal plate 90 can be started, tension-free rolling at the tip is started in step S112, whereby tension-free rolling at the tip is completed. The metal plate 90 can be properly wound up by the winding device 14 .

If the strip edge position detector is provided only at one place on the delivery side of the rolling rolls 15 and 16, the following problems may arise. That is, for example, as shown in FIG. 7, even if the longitudinal direction of the metal plate 90 is inclined with respect to the conveying direction of the metal plate 90 by the rolling rolls 15 and 16 (rolling mill 10) before starting rolling, It is unclear whether or not the longitudinal direction of the metal plate 90 is inclined with respect to the conveying direction described above from the plate end position detection result obtained at only one point in the direction. In this case, when tension-free rolling at the leading end is started, the direction of outflow of the metal plate 90 from the rolling rolls 15 and 16 remains inclined with respect to the conveying direction of the rolling mill 10 . Therefore, the strip edge position (for example, the second strip edge position x2 in FIG. 7) detected by the strip edge position detector arranged on the delivery side is substantially constant even after the start of rolling. Therefore, even if the control based on the detected plate edge position is performed, the tilt of the metal plate 90 with respect to the conveying direction cannot be corrected. In some cases, the metal sheet 90 after rolling cannot be properly wound by the winding device 14 because the rolled metal sheet 90 is separated from the conveying line by the winding device 14 in the sheet width direction.

In this regard, according to the above-described embodiment, in step S106, at each of the first position Y1 on the entry side and the second position Y2 on the exit side of the pair of rolling rolls 15 and 16, the width direction of the metal plate 90 are detected (the first plate end position x1 and the second plate end position x2). Therefore, based on these detection results, it is possible to grasp the degree of inclination of the longitudinal direction of the metal plate 90 with respect to the conveying direction before the start of tension-free rolling at the tip. It is possible to grasp the degree of inclination of the outflow direction of 90 with respect to the conveying direction. Then, in step S108, based on the detection results of the first strip end position x1 and the second strip end position x2, it is determined whether or not the tip tensionless rolling can be started. When it is determined that the longitudinal direction of the metal plate 90 (that is, the outflow direction of the metal plate 90 at the start of rolling) is substantially parallel to the conveying direction, tension-free rolling of the leading end of the metal plate 90 can be started. can be determined.

Therefore, according to the above-described embodiment, the leading end tension-free rolling can be started in a state in which the outflow direction of the metal plate 90 and the conveying direction are substantially parallel. Displacement in the width direction can be suppressed. Therefore, the rolled metal plate 90 can be easily wound appropriately by the winding device 14 .

In addition, according to the above-described embodiment, since tension-free rolling at the leading end can be started in a state in which the outflow direction and the conveying direction of the metal plate 90 are substantially parallel, the second strip end position x2 obtained at the start of tension-free rolling at the leading end is used as a reference, roll reduction leveling control of the rolling mill 10, such as meandering control of the metal plate 90, can be appropriately performed based on the second plate end position detected during tensionless rolling of the leading edge.

Therefore, it is possible to appropriately wind up the metal plate 90 that has been tension-free rolled at the leading end by the winding device 14 .

In the case of the rolling mill 1 including the two rolling mills 10 (first rolling mill 10A and second rolling mill 10B) shown in FIG. It is determined whether or not the first tension-free rolling of the metal plate 90 in the rolling mill 10A) can be started, and it is determined that the first tension-free rolling at the tip can be started, and the pair of first rolling rolls 15A, It is configured to determine whether or not to start the second tension-free rolling of the metal plate 90 on the pair of second rolls 15B, 16B after the tip tension-free rolling by 16A is started.
That is, steps S102 to S112 described above are performed for the first rolling mill 10A, and when tension-free rolling of the leading end of the metal plate 90 is started, then steps S102 to S112 described above are performed for the second rolling mill 10B. .

In this way, in each of the first rolling rolls 15A, 16A (first rolling mill 10A) and second rolling rolls 15B, 16B (second rolling mill 10B) arranged in the conveying direction, in step S108, the tip ends are untensioned. It is determined whether or not rolling can be started, and based on this determination result, tension-free rolling at the leading end is started in step S112. can be appropriately wound by the winding device, the rolling can be performed more efficiently using the pair of rolling rolls 15A and 16A and the pair of rolling rolls 15B and 16B.

It is preferable that the first plate edge detector 32 and the second plate edge detector 34 be provided as close to the rolls 15 and 16 as possible in the conveying direction of the metal plate 90 by the rolls 15 and 16 . As a result, the first plate end position x1 and the second plate end position are detected by the first plate end detection unit 32 and the second plate end detection unit 34 in a state where the leading end of the metal plate 90 is arranged near the rolling rolls 15 and 16 . x2 can be detected, and based on this detection result, rolling can be started with the tip 91 of the metal plate 90 positioned near the rolling rolls 15 and 16, and the yield of the metal plate 90 can be effectively improved. This is because it can be improved to

In some embodiments, when the distance in the conveying direction between the pair of rolling rolls 15 and 16 and the winding device 14 is L2 (see FIGS. 1 and 2), the pair of rolling rolls 15 and 16 and the second plate A distance Lb (see FIGS. 1 and 2) in the conveying direction from the edge detector 34 is 0.1×L2 or less. In some embodiments, the aforementioned distance Lb is less than or equal to 0.5*L2.

Here, the distance in the conveying direction between the pair of rolling rolls 15 and 16 and the winding device 14 is the distance in the conveying direction between the central axis O of the pair of rolling rolls 15 and 16 and the central axis of the winding device 14. is. Further, the distance between the pair of rolling rolls 15 and 16 and the second strip edge detecting section 34 in the conveying direction is the central axis of the pair of rolling rolls 15 and 16 and the center position of the second strip edge detecting section 34, or , and the position (second position Y2) detected by the second plate end detection unit 34 in the conveying direction. The direction of the central axis O of the rolling rolls 15 and 16, the direction of the central axis of the unwinding device 4, and the direction of the central axis of the winding device 14 are substantially parallel to each other.

In this manner, the distance Lb between the second plate edge detector 34 and the rolling rolls 15, 16 in the conveying direction is relatively short, so that the leading edge 91 of the metal plate 90 at the start of tension-free rolling is positioned between the rolling rolls. It is possible to detect the second strip end position x2 at the start of tension-free rolling and during tension-free rolling, while relatively close to each other. Therefore, the length of the tip portion of the metal plate 90 that is not rolled can be shortened, and the leading end can be appropriately tension-free rolled, thereby effectively improving the yield of the metal plate 90 .

In some embodiments, when the distance in the conveying direction between the pair of rolling rolls 15 and 16 and the unwinding device 4 is L1 (see FIGS. 1 and 2), the pair of rolling rolls 15 and 16 and the first plate A distance La in the conveying direction from the edge detector 32 is 0.1×L1 or less. In some embodiments, the aforementioned distance La is less than or equal to 0.5*L1.

Here, the distance L1 in the conveying direction between the pair of rolling rolls 15 and 16 and the unwinding device 4 is the distance between the central axis O of the pair of rolling rolls 15 and 16 and the central axis of the unwinding device 4 in the conveying direction Distance. Further, the distance in the conveying direction between the pair of rolling rolls 15 and 16 and the first plate edge detecting portion 32 is defined by the central axis O of the pair of rolling rolls 15 and 16 and the center position of the first plate edge detecting portion 32, Alternatively, it is the distance in the conveying direction from the board edge detection position (first position Y1) by the first board edge detection unit 32 .

In the case of a rolling mill (reverse mill) that reciprocates and rolls the metal plate 90 passed between a pair of rolling rolls 15 and 16, in the second pass after the end of the first pass, the conveying direction of the metal plate 90 is reversed. , rolling by the rolling rolls 15 and 16 is started from the rear end side of the metal plate 90 . In this respect, according to the above-described embodiment, the distance between the first strip edge detector 32 and the rolling rolls 15 and 16 is compared in the conveying direction in the second pass (opposite to the conveying direction in the first pass). Since it was shortened, while the rear end position of the metal plate 90 at the start of the tension-free rolling of the second pass is set relatively close to the rolling rolls, the first plate end position x1 can be detected. Therefore, the length of the rear end portion of the metal plate 90 that is not rolled can be shortened, and tension-free rolling can be appropriately performed at the leading end, thereby improving the yield of the metal plate 90 .

In some embodiments, the rolling facility 1 is provided on at least one of the entry side and exit side of the pair of rolling rolls 15 and 16 in the conveying direction, and is configured to measure the plate thickness of the metal plate 90. Equipped with a plate thickness gauge. In one embodiment, the first strip edge detector 32 or the second strip edge detector 34 is positioned between the pair of rolling rolls 15 and 16 and the thickness gauge in the conveying direction. Alternatively, in one embodiment, the first strip edge detector 32 or the second strip edge detector 34 may be arranged at the same position as the strip thickness gauge in the transport direction. In this case, the first strip edge detection section 32 or the second strip edge detection section 34 may be provided as one integrated with the strip thickness gauge.

In the embodiment shown in FIGS. 1 and 2, a plate thickness gauge 36 is provided on the inlet side of the pair of rolling rolls 15 and 16 in the conveying direction, and the first plate edge detector 32 is provided with a pair of rolls in the conveying direction. is located between the rolling rolls 15 and 16 and the plate thickness gauge 36 . Further, in the embodiment shown in FIGS. 1 and 2, a plate thickness gauge 38 is provided on the delivery side of the pair of rolling rolls 15 and 16 in the conveying direction, and the second plate edge detector 34 detects It is located between the pair of rolling rolls 15 and 16 and the plate thickness gauge 38 .

The plate thickness gauges 36, 38 used to control the plate thickness of the metal plate 90 are preferably provided near the rolling rolls 15, 16 in the conveying direction in order to improve control response. In this regard, according to the above-described embodiment, the first strip edge detector 32 or the second strip edge detector is located at the same position as the strip thickness gauges 36, 38 or closer to the rolling rolls 15, 16 than the strip thickness gauges 36, 38 in the conveying direction. Since the portion 34 is provided, the tip position of the metal plate 90 at the start of tension-free rolling is brought closer to the rolling rolls 15 and 16, and the first plate end position x1 or the second plate end position x1 at the start of tension-free rolling and during tension-free rolling It is possible to detect the board end position x2. Therefore, while the length of the tip portion of the metal plate that is not rolled is shortened, the tip tension-free rolling can be appropriately performed, thereby improving the yield of the metal plate.

In some embodiments, the first strip edge detector 32 or the second strip edge detector 34 detects the first strip edge position x1 or the second strip edge position x2 using radiation (eg, X-rays or gamma rays). configured to

The vicinity of the rolling rolls 15 and 16 is often a harsh environment where a large amount of rolling oil and fumes scatter, the rolling rolls 15 and 16 vibrate, and it is dark. In this respect, according to the above-described embodiment, the first strip edge detection unit 32 or the second strip edge detection unit 34 that detects the strip edge position using radiation is used, so that the rolling rolls under a severe environment Even if they are arranged near 15 and 16, the plate edge position can be detected appropriately.

FIG. 8 is a schematic diagram showing a partial cross section including the width direction and the longitudinal direction of the metal plate 90 rolled by the rolling facility 1 according to one embodiment. As shown in FIG. 8 , the metal plate 90 has a first surface 94 positioned on the rolling roll 15 side in the plate thickness direction and a second surface 95 positioned on the rolling roll 16 side in the plate thickness direction.
9 and 10 are graphs each showing an example of a graph showing the relationship between the gap (inter-roll gap) between the pair of rolling rolls 15 and 16 in the period including the start of rolling of the metal plate 90 and time. be.

In some embodiments, the rolling control unit 44 of the controller 40, when the determining unit 42 determines in the above-described step S108 that tension-free rolling of the leading end of the metal plate 90 can be started, in the above-described step S120 , the pair of rolling rolls 15 and 16 are brought into contact with the metal plate 90 (time t0 in FIG. 9). At this point, the metal plate 90 has not yet been rolled down, and the contact position between the rolls 15 and 16 and the metal plate 90 (the position of the central axis O of the rolls 15 and 16 in the conveying direction) is closer than the tip 91. They are positions 94a and 95a on the downstream side (see FIG. 8), and the plate thickness at these positions 94a and 95a is H0 (initial value). After that, while rotating the pair of rolling rolls 15 and 16, the pair of rolling rolls 15 is moved to positions 94b and 95b (see FIG. 8) further downstream than the above-described positions 94a and 95a as the metal plate 90 is conveyed. , 16 gradually decreases until it reaches the control value dc corresponding to the target thickness Hc of the metal plate 90. time t1 to t2). After time t2, the inter-roll gap is maintained at the control value dc corresponding to the target thickness Hc so that the thickness of the metal sheet 90 passing through the rolling rolls 15 and 16 becomes the target thickness Hc.

As a result, the portion including the tip 91 of the metal plate 90 has the shape indicated by the solid line in FIG. That is, the metal plate 90 includes a tip 91, a tip portion 90a having a plate thickness H0, a trailing portion 90c having a plate thickness maintained at the target plate thickness Hc, and a tip portion 90a in the longitudinal direction of the metal plate. and a trailing portion 90c. At the transition portion 90b, the plate thickness gradually decreases from H0 to Hc from positions 94a and 95a to positions 94b and 95b.

With the front end portion of the metal plate 90 (the portion indicated by reference numeral 90a in FIG. 8) passed between the pair of rolling rolls 15 and 16, the rolling of the metal plate 90 by the rolling rolls 15 and 16 and the tensionless rolling of the front end are started. In this case, the difference in plate thickness between the tip portion 90a of the metal plate 90 that is not rolled by the rolling rolls 15 and 16 and the trailing portion 90c that is rolled may become large. For example, as shown in FIG. 10, it is assumed that the gap between the pair of rolling rolls 15 and 16 is narrowed to the control value dc corresponding to the target plate thickness Hc (time t1 in FIG. 10), and in that state the rolling rolls 15 and 16 16 rotation is started (time t1 in FIG. 10), the shape of the metal plate 90 changes, as indicated by the two-dot chain line in FIG. The plate thickness is H0) and the trailing portion 90c (plate thickness is Ht) behind the above-described positions 94a and 95a.

In this case, when the metal plate 90 is wound by the winding device 14, stress may concentrate on the boundary between the leading end portion 90a and the trailing portion 90c, and the metal plate 90 may be cut at this boundary. be.

In this regard, in the above-described embodiment, when the leading end of the metal plate 90 starts to be rolled without tension, after the pair of rolling rolls 15 and 16 are brought into contact with the metal plate 90, the rolling rolls 15 and 16 are rotated while the metal plate 90 is rolled. The number of rotations of the rolling rolls 15 and 16 and the reduction amount are adjusted so that the gap between the rolling rolls 15 and 16 gradually decreases to the control value dc corresponding to the target plate thickness Ht of the metal plate 90 as the metal plate 90 is conveyed. do. Therefore, a transition portion 90b (see FIG. 8) in which the plate thickness gradually decreases is formed between the leading end portion 90a having the same plate thickness H0 as before rolling and the trailing portion 90c rolled to the target plate thickness Hc. be. Therefore, stress concentration that may occur at the boundary between the leading end portion 90a and the trailing portion 90c when the metal plate is wound by the winding device 14 can be alleviated. As a result, the rolled metal plate 90 can be wound more appropriately by the winding device 14 .

In some embodiments, as described above, as the metal plate 90 is conveyed, the gap between the pair of rolling rolls 15 and 16 gradually decreases until it reaches the control value dc corresponding to the target thickness Hc of the metal plate 90. At this time, the inclination angle α1 of the first surface 94 at the transition portion 90b with respect to the longitudinal direction of the metal plate 90 or the inclination angle α2 of the second surface 95 at the transition portion 90b with respect to the longitudinal direction of the metal plate 90 is 20°. The number of revolutions of the pair of rolling rolls 15 and 16 and the reduction amount are adjusted so that the rolling speed is below 100 degrees.

As a result, the change in plate thickness at the transition portion 90b (see FIG. 8) does not become too abrupt. Possible stress concentration can be effectively relieved, and the rolled metal sheet 90 can be wound more appropriately by the winding device 14 .

Next, as described above, the operation method of the rolling mill 2 after starting tensionless rolling of the tip end of the metal plate 90 (the part following the flowchart in FIG. 4), and the rolling equipment for executing the operation method 1, the configuration of the control device 100 will be further described.

In some embodiments, the control device 100 rolls the metal plate 90 with the pair of rolling rolls 15 and 16 in a state where the delivery side tension applied to the metal plate 90 is zero (that is, the tip of the metal plate 90 It is provided with a detection unit configured to detect the plate edge position xB in the width direction of the metal plate 90 at the position on the delivery _side of the pair of rolling rolls 15 and 16 while performing tensionless rolling. In the embodiment shown in FIGS. 1 and 2, the second strip end detector 34 provided on the delivery side of the rolling rolls 15 and 16 functions as the detector described above.

Also, in some embodiments, the controller 40 (see FIG. 3) of the control device 100 includes a first leveling section 46 and a second leveling section 48 .

The first leveling unit 46 detects the strip edge position detected by the second strip edge detection unit 34 (hereinafter also simply referred to as the “second strip edge detection unit 34”) as the detection unit described above, and detects the strip width from the reference position. When deviating to one side of the direction (one side of the first edge 92 or the second edge 93; see FIG. 12A etc.), the outflow direction of the metal plate 90 from the rolling rolls 15 and 16 is the metal plate in the rolling device 2 It is configured to perform roll-down leveling control of the pair of rolling rolls 15 and 16 along the conveying direction of the roll 90 .

After the reduction leveling control by the first leveling section 46, the second leveling section 48 moves the outflow direction of the metal sheet 90 from the rolling rolls 15 and 16 to the other side of the sheet width direction (first edge 92) with respect to the conveying direction. or the other side of the second edge 93; see FIG. 12A, etc.), the pair of rolling rolls 15 and 16 are configured to perform reduction leveling control so that the outflow direction of the metal plate 90 returns to the conveying direction. be done.

In the control device 100 described above, while the metal plate 90 is rolled in a tension-free state at the leading end, the second plate end detection unit 34 (detection unit) detects the thickness of the metal plate 90 at the delivery side position of the rolling rolls 15 and 16 . Since the plate edge position xB in the plate width direction is detected, when the detected plate end position _xB deviates from the reference position to one _side in the plate width direction, the outflow direction of the metal plate 90 is detected. It is possible to detect the occurrence of a shift to one side in the plate width direction (bending of the tip of the metal plate 90). Then, when the edge bending of the metal plate 90 is detected, the first leveling unit 46 controls the roll-down leveling so that the outflow direction of the metal plate 90 is aligned with the conveying direction of the metal plate 90 in the rolling mill 2. The outflow direction of the metal plate 90 is shifted to the other side in the plate width direction with respect to the conveying direction by the reduction leveling control by the leveling unit 48, and then the outflow direction of the metal plate 90 is made to follow the conveying direction. is corrected, and the leading end edge (leading end 91) of the metal plate 90 is made parallel to the axial direction of the winding device 14, and the leading end tensionless rolling can be continued. Therefore, according to the above configuration, the metal plate 90 that has been tension-free rolled at the leading end can be properly wound up by the winding device 14 .

Also, in some embodiments, the controller 40 may include at least one of the differential expansion calculator 50 , the deviation angle calculator 52 , or the remaining time calculator 54 .

After the plate edge position xB detected by the second plate edge detector 34 moves away from the reference position toward the one _side , the differential expansion calculator 50 calculates the plate edge position xB by the roll-down leveling control by the first leveling unit 46. It is configured to calculate a first difference d1 in expansion of the other side of the metal plate 90 relative to the one side until _B returns to the reference position.

The shift angle calculator 52 acquires the first shift angle θ1 of the outflow direction of the metal plate 90 to the one side with respect to the conveying direction at the start of the reduction leveling control by the first leveling unit 46, and obtains the first shift angle θ1. Based on this, the second deviation angle θ2 of the outflow direction of the metal plate 90 to the other side with respect to the conveying direction during execution of the reduction leveling control by the second leveling section is determined.

The remaining time calculator 54 is configured to calculate the remaining time Tc until the tip 91 of the metal plate 90 reaches the winding device 14 provided downstream of the pair of rolling rolls 15 and 16 .

1 to 3 and 11 to 15, the operation method of the rolling mill 2 by the control device 100 according to some embodiments will be described. The rolling mill 2 may be operated partially or wholly manually.

11 and 14 are flowcharts each showing an example of a method of operating the rolling mill 2 according to one embodiment. 12A to 12D are diagrams showing state transitions of the metal plate 90 when the rolling mill 2 is operated based on the flowchart shown in FIG. FIG. 13 is a graph for explaining an example of a method of calculating the first differential expansion and the second differential expansion of the metal plate 90. In this graph, the horizontal axis indicates time, and the vertical axis indicates the shift amount Δe described later. indicate. 15A to 15D are diagrams showing state transitions of the metal plate 90 when the rolling mill 2 is operated based on the flowchart shown in FIG.

In the embodiment according to the flowchart shown in FIG. While performing tension-free rolling at the tip), the second plate end detection unit 34 is used to detect the metal plate at the position on the delivery side of the pair of rolling rolls 15 and 16 (“plate end detection position” shown in FIGS. 12A to 12D). The strip edge position _xB in the strip width direction of 90 is detected (step S202; detection step). Note that in the graph of FIG. 13, time t20 is the point in time when tension-free rolling of the leading edge of the metal plate 90 is started.

Next, the shift amount Δe of the strip edge position xB detected in step S202 from the reference position in the strip width direction to one side in the strip width direction (one side of the first edge 92 or the second edge 93) is calculated (step S204), and the calculated shift amount Δe is compared with a threshold value Δe_th (step S206).

Here, the reference position is a specific position in the plate width direction when the longitudinal direction of the metal plate 90 is parallel to the conveying direction of the rolling mill 2 (the direction orthogonal to the central axes of the rolling rolls 15 and 16). is. In the examples shown in FIGS. 12A to 12D, the position of the first edge 92 of the metal plate 90 when the longitudinal direction of the metal plate 90 is parallel to the conveying direction of the rolling mill 2 is defined as the "reference position." The center position (the position of the center line Lc) of the metal plate 90 in the width direction when the longitudinal direction of the metal plate 90 is parallel to the conveying direction of the rolling mill 2 may be set as the “reference position”.

At the stage shown in FIG. 12A, the reference position and the strip edge position xB match in the strip width direction, and the shift amount _Δe calculated in step S204 is zero. Therefore, in step S206, it is determined that the deviation amount _Δe is smaller than the threshold value (NO in step S206), and the process returns to step S202, and the second board edge detection unit 34 detects the board edge position xB again.

FIG. 12B shows a stage in which the leading edge of the metal plate 90 is bent from the state shown in FIG. 12A due to some disturbance (for example, non-uniformity of the plate thickness in the plate width direction of the metal plate 90). In the example shown in FIG. _12B , the strip edge position xB detected in step S202 deviates from the reference position toward the first edge 92 (one side) in the strip width direction. That is, the outflow direction of the metal sheet 90 from the rolling rolls 15 and 16 is shifted toward the first edge 92 side (one side) in the sheet width direction with respect to the conveying direction by the rolling rolls 15 and 16 . At this time, the shift amount Δe calculated in step S204 becomes larger than zero. In the graph shown in FIG. 13, the shift amount Δe starts to become larger than zero at time t21, and reaches a maximum at time t23 (the state shown in FIG. 12B).

When the shift amount Δe calculated in step S204 is equal to or less than the threshold value _{Δe_th} (NO in step S206), the process returns to step S202 and the second board edge detection unit 34 detects the board edge position xB again. On the other hand, when the displacement amount Δe calculated in step S204 becomes larger than the threshold value Δe_th (YES in step S206, time t23 in the graph of FIG. 13), in step S208, the screw-down device 22 is adjusted so that the displacement amount Δe becomes zero. leveling control of the rolling rolls 15 and 16 is performed (step S208). That is, in step S208, the pair of rolling rolls 15 and 16 is subjected to roll-down leveling control so that the outflow direction of the metal plate 90 from the rolling rolls 15 and 16 is along the conveying direction of the metal plate 90 in the rolling mill 2 (second 1 leveling step). FIG. 12C is a diagram showing the stage at the end of step S208 (when the above-described shift amount Δe becomes zero; time t24 in the graph of FIG. 13).

Next, after the strip edge position xB detected by the second strip edge detection unit 34 moves away from the reference position toward the one _side in the strip width direction (here, the first edge 92 side) (see FIG. 12B ). state shown in FIG. 12C) until the plate edge position _xB detected by the second plate edge detection unit 34 in the first leveling step (step S208) returns to the reference position (until the state shown in FIG. 12C is reached). A first differential expansion E1 relative to the one side (first edge 92 side) of the other side (here, the second edge 93 side) of the plate 90 is calculated (step S210; expansion difference calculation step). Here, in the example shown in FIGS. 12B and 12C, the elongation of the metal plate 90 on the second edge 93 side is E1, whereas the elongation of the metal plate 90 on the first edge 92 side is zero. Therefore, the above-mentioned first differential expansion is E1.

In the expansion difference calculation step (step S210), after the plate edge position xB detected by the second plate edge detection unit 34 moves away from the reference position toward one _side (here, the first edge 92 side) (Fig. 13), time integration of the shift amount _Δe of the strip edge position _xB from the reference position until the strip edge position xB returns to the reference position in the first leveling step (time t24 in the graph of FIG. 13). Based on (area S _1B ′ shown in graph FIG. 13), the first differential expansion E1 is calculated. Here, the reason _why the first differential expansion E1 can be calculated based on the area S _1B ' shown in the graph of FIG. 13 is that the triangle indicated by symbol S _1A in FIG. This is because there is a specific correlation between the triangle indicated by symbol S _1B in 12B and the area S _1B' in the graph of FIG.

Next, the remaining time Tc until the tip 91 of the metal plate 90 reaches the winding device 14 provided downstream of the pair of rolling rolls 15 and 16 is calculated (step S212; remaining time calculating step). The starting point of calculation of the remaining time Tc is, for example, the time when the deviation amount Δe becomes zero in the first leveling step (end of step S208; time t24 in the graph of FIG. 13), or the start of the second leveling step. It may be the point in time (start point of steps S214 to S218 described later; time t25 in the graph of FIG. 13). In the graph of FIG. 13, the time from the start of the second leveling step (time t25) to time t27 is the remaining time Tc. The remaining time Tc can be calculated based on the distance between the tip 91 of the metal plate 90 and the winding device 14 and the transport speed of the metal plate 90 .

Next, after the outflow direction of the metal sheet 90 from the rolling rolls 15 and 16 is shifted to the other side in the sheet width direction (here, the second edge 93 side) with respect to the conveying direction, the outflow direction of the metal sheet 90 is changed to Reduction leveling control of the pair of rolling rolls 15 and 16 is performed so as to return to the conveying direction (steps S214 to S218; second leveling step). Here, FIG. 12D shows the state at the end of the second leveling step (that is, the state at the end of step S218).

In step S214, the driving motors of the screw down device 22 and the rolling rolls 15 and 16 are adjusted so as to give the metal plate 90 a second differential expansion E2 (see FIG. 12D) equal to the first differential expansion E2 within the remaining time Tc. Calculate the control command value for Here, the second difference in expansion E2 is a second difference in expansion relative to the other side (here, the second edge 93 side) of the one side (here, the first edge 92 side) of the metal plate 90. be.

That is, by performing the second leveling step, as shown in FIGS. 12D and 13, the plate edge position xB is shifted toward the second edge 93, resulting in a shift amount _Δe . Then, the rolling rolls 15 and 16 are leveled so that the time integrated value of Δe on the second edge 93 side (area S _2B ' in the graph of FIG. 13) becomes equal to the area S _2A ' in the graph of FIG. By performing control, the second differential expansion E2 (see FIG. 12D) can be given to the metal plate 90 so as to form a triangle indicated by symbol _S2B in FIG. 12D. _12D and the area S _{2B '} of the graph of FIG _. is similar to

In step S216, leveling control of the rolling rolls 15 and 16 is performed based on the control command value calculated in step S214. Between the first difference E1 and the second difference E2, the control of step S216 is repeated until the difference |E1-E2| When the difference |E1−E2| is within the specified range (YES in step S218), it means that the bending of the leading edge of the metal plate 90 detected in steps S202 to S206 has been corrected. Returning to S<b>202 , the tip bending of the metal plate 90 that may occur next is detected.

The first differential expansion E1 caused by bending of the leading end of the metal plate 90 indicates the magnitude of displacement of the outflow direction of the metal plate 90 to one side in the plate width direction. In this respect, according to the above-described embodiment, the first difference in elongation E1 caused by bending the tip of the metal plate 90 is calculated, and the second difference in elongation E2 is rolled so as to be equal to the first difference in elongation E1. Roll-down leveling control of the rolls 15 and 16 is performed. That is, elongation (second elongation (Elongation corresponding to the difference E2) is applied to the other end side (here, the second edge 93 side) of the metal plate 90. Therefore, the tip bending of the metal plate 90 is appropriately corrected. Then, the leading edge (tip 91 ) of the metal plate 90 can be brought close to the axial direction of the winding device 14 in parallel. Therefore, the metal sheet that has been tension-free rolled at the leading end can be properly wound up by the winding device.

In addition, the above-described first difference in elongation E1 generated in the metal plate 90 due to the tip bending of the metal plate 90 has a correlation with the time integral of the deviation amount _Δe of the plate end position xB from the above-described reference position, and is typically , there is a proportional relationship between the first differential expansion E1 and the time integration of the deviation amount .DELTA.e. In this respect, according to the above-described embodiment, the first differential expansion E1 can be appropriately calculated based on the time integration of the deviation amount Δe. Therefore, in the second leveling step, the roll-down leveling control is performed so as to give the metal plate 90 the second difference E2 equal to the first difference E1 calculated in this way, so that the leading end of the metal plate 90 is bent appropriately. can be rectified.

Further, in the above-described embodiment, the remaining time Tc until the leading end 91 of the metal plate 90 reaches the winding device 14 after the leading end bending of the metal plate 90 occurs is calculated, and the second winding is performed within the calculated remaining time Tc. Since the difference in elongation E2 is given to the metal plate 90, it is possible to appropriately correct the bending of the leading end of the metal plate 90 before the metal plate 90 starts winding.

In the above-described embodiment, the first difference in elongation E1 is calculated based on the time integration of the amount of deviation _Δe of the detected plate end position xB from the reference position, and the rolling rolls 15 are calculated based on the first difference in elongation E1. , 16 roll-down leveling control was performed. On the other hand, in the embodiment according to the flowchart of FIG. 14, the reduction leveling control of the rolling rolls 15 and 16 is based on the deviation angle of the outflow direction of the metal plate 90 from the conveying direction when the leading end of the metal plate 90 is bent. I do. More specifically, in the embodiment according to the flowchart of FIG. 14 , the first leveling step toward one side (here, the first edge 92 side) with respect to the conveying direction of the outflow direction of the metal plate 90 at the start of the first leveling step. Based on the deviation angle θ1 (see FIG. 15B), a second deviation angle θ2 (see FIG. 15C) of the outflow direction toward the other side (here, the second edge 93 side) with respect to the conveying direction during execution of the second leveling step is calculated. decide.

In the flowchart of FIG. 14, the contents of steps S302, S304, S306, S312, S316, and S318 are the same as steps S202, S204, S206, S212, S216, and S218 shown in FIG.

In the embodiment according to the flowchart shown in FIG. 14, when the deviation amount _Δe calculated in step S304 based on the board edge position xB detected in step S302 (detection step) is larger than the threshold (YES in step S306), this 15B), the outflow direction of the metal plate 90 toward one side (here, the first edge 92 side) with respect to the conveying direction. 15B) is obtained (step S308). The first deviation angle θ1 may be obtained based on the deviation amount Δe and the distance m between the central axis O of the rolling rolls 15 and 16 in the conveying direction and the strip edge detection position by the second strip edge detector 34 (tan θ1 = Δe/m). Alternatively, the first deviation angle θ1 may be obtained based on an image captured by an imaging device or the like.

Next, based on the first deviation angle θ1 acquired in step S308, the second deviation angle θ2 to be given to the metal plate 90 in the second leveling step, that is, the other side of the outflow direction of the metal plate 90 with respect to the conveying direction ( Here, the second deviation angle θ2 to the second edge 93 side) is determined (step S310; see FIG. 15C).

Then, within the remaining time Tc calculated in step S312, the screw-down device 22 is such that the deviation angle of the metal plate 90 toward the other side (here, the side of the second edge 93) becomes the above-described second deviation angle θ2. And the control command value for the driving motors of the rolling rolls 15 and 16 is calculated (step S314). Then, leveling control (first leveling step and second leveling step) of the rolling rolls 15 and 16 is performed based on the control command value thus calculated (step S316). Then, when the deviation angle of the metal plate 90 to the other side (here, the second edge 93 side) becomes the second deviation angle θ2 (YES in step S318), the metal plate detected in steps S302 to S306 Since the bending of the tip of the metal plate 90 has been corrected, the process returns to step S302 again to detect the bending of the tip of the metal plate 90 that may occur next.

The first deviation angle θ1 of the outflow direction of the metal plate 90 to one side (here, the first edge 92 side) with respect to the conveying direction caused by the bending of the leading end of the metal plate 90 is the same as the above-described first differential expansion E1, The magnitude of deviation of the outflow direction of the metal plate 90 to the one side (first edge 92 side) in the plate width direction is shown. In this respect, in the above-described embodiment, it is possible to appropriately determine the second deviation angle θ2 of the outflow direction toward the other side of the transport direction during execution of the second leveling step based on the above-described first deviation angle θ1. . Therefore, by performing roll-down leveling control so as to give the metal plate 90 the second deviation angle θ2 determined in this manner, the leading edge bending of the metal plate 90 is appropriately corrected, and the leading edge of the metal plate 90 is wound. It can be approached parallel to the axial direction of the take-up device 14 . Therefore, the metal plate 90 that has been tension-free rolled at the leading end can be properly wound up by the winding device 14 .

Note that the second deviation angle θ2 determined in step S310 may be applied to the metal plate 90 at once (see FIG. 15C) in the second leveling step of step S316, or may be divided into multiple times. , may be applied to the metal plate 90 (see FIG. 15D). In FIG. 15D, the deviation angles of the metal plate 90 toward the other side (second edge 93 side) are given as an angle θ2a for the first time, an angle θ2b for the second time, and an angle θ2c for the third time. Here, the sum of θ2a, θ2b and θ2c is θ2 (θ2a+θ2b+θ2c=θ2).

In this case, compared to the case where the large second deviation angle θ2 is given to the other side (second edge 93 side) of the metal plate 90 at once (see FIG. 15C), small amounts of the second deviation angles θ2a, θ2b, and θ2c are applied. Since it is divided and applied to the metal plate 90, the tip bending of the metal plate 90 can be corrected more stably.

In some embodiments, after completing the first leveling step, the second leveling step is started within a time period equal to or less than the time required for the first leveling step.

For example, in the embodiment described with reference to FIGS. 11 to 12D, the time required for the first leveling step (from the YES determination in step S206 in FIG. 11 to the end of step S208) is shown in the graph in FIG. It is from time t22 to time t24. The time from the end of the first leveling step to the start of the second leveling step is from time t24 to t25 in the graph of FIG. 13, which is shorter than the time required for the first leveling step.

Further, in the embodiment described with reference to FIGS. 14 to 15D, the first leveling step and the second leveling step are performed indiscriminately (continuously) in step S316, and after the first leveling step, the second leveling step is performed. The time until the start of the step is substantially zero, and the first leveling step (from the outflow direction of the metal plate 90 shifting to one side (first edge 92 side) to returning to the same direction as the conveying direction) Less than required time.

In this case, after the outflow direction of the metal plate 90 is aligned with the conveying direction in the first leveling step, the second leveling step is started within the time required for the first leveling step or less, and the metal plate 90 is leveled. The outflow direction is shifted to the other side (the second edge 93 side). That is, after the end of the first leveling step, the outflow direction of the metal plate 90 is shifted to the other side (the side of the second edge 93) within a short period of time. It is possible to reduce the amount of deviation (Δd shown in FIG. 12D ) in the width direction between the width direction center position of the tip bending portion and the width direction center position of the metal plate 90 on the rolling rolls 15 and 16 . (In other words, the area of the rectangular portion A1 shown in FIGS. 12C and 12D can be made as small as possible.) For example, as shown in FIG. 15C, the first leveling step and the second leveling step are continuously performed. Therefore, the above-described deviation amount Δd becomes almost zero. Therefore, the metal sheet 90 that has been tension-free rolled at the leading end can be wound more appropriately by the winding device 14 .

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 control device for controlling a rolling mill including a pair of rolling rolls provided to sandwich a metal plate,
A first plate provided on the entry side of the pair of rolling rolls in the conveying direction of the metal plate and configured to detect a plate end position in the width direction of the metal plate at a first position in the conveying direction. an edge detector;
A second plate end detection unit provided on the delivery side of the pair of rolling rolls in the conveying direction and configured to detect a plate end position in the plate width direction of the metal plate at a second position in the conveying direction. When,
Based on the first plate end position of the metal plate detected by the first plate end detection unit and the second plate end position of the metal plate detected by the second plate end detection unit, the a determination unit configured to determine whether or not to start tension-free rolling at the front end, which is rolling of the metal plate by the pair of rolling rolls in a state where the tension on the delivery side of the metal plate is zero;
Prepare.

According to the configuration (1) above, at each of the first position on the entry side and the second position on the exit side of the pair of rolling rolls, the plate edge positions (the first plate end position and the first plate end position) in the width direction of the metal plate 2 board end position) is detected. Therefore, based on these detection results, it is possible to grasp the degree of inclination of the metal plate in the longitudinal direction with respect to the conveying direction before the start of tension-free rolling at the tip. It is possible to grasp the degree of inclination of the outflow direction with respect to the conveying direction. In the above configuration (1), it is determined whether or not to start tensionless rolling at the tip based on the detection results of the first strip end position and the second strip end position. When it is determined that the longitudinal direction of the metal plate (that is, the outflow direction of the metal plate at the start of rolling) is substantially parallel to the conveying direction, tension-free rolling of the tip end of the metal plate can be started. can judge.
Therefore, according to the above configuration (1), since the leading end tension-free rolling can be started in a state in which the outflow direction and the conveying direction of the metal plate are substantially parallel, the leading end portion of the metal plate can be moved from the conveying line by the rolling mill to the width of the plate. It is possible to suppress deviating in the direction. For this reason, it becomes easy to wind up the rolled metal plate appropriately with a winding device.
In addition, according to the above configuration (1), since the tip tension-free rolling can be started in a state in which the outflow direction and the conveying direction of the metal plate are substantially parallel, the second plate end position acquired at the start of the tip tension-free rolling is used as a reference, it is possible to appropriately control the rolling mill, such as meandering control of the metal plate, based on the second plate end position detected during tensionless rolling of the tip.
Therefore, it is possible to appropriately wind up the metal sheet that has been tension-free rolled at the leading end by the winder.

(2) In some embodiments, in the configuration of (1) above,
The determination unit is configured to determine that the tension-free rolling of the leading end of the metal plate can be started when a difference between the first plate end position and the second plate end position is within a specified range. be.

The difference between the first plate end position and the second plate end position is the inclination of the direction connecting the first plate end position and the second plate end position, that is, the longitudinal direction of the metal plate with respect to the conveying direction of the metal plate by the rolling mill. Indicates degree. Further, the fact that the difference between the first plate end position and the second plate end position is zero indicates that the longitudinal direction of the metal plate is parallel to the conveying direction.
In this respect, according to the configuration (2) above, when the difference between the first plate end position and the second plate end position is within the specified range, that is, the inclination of the longitudinal direction of the metal plate with respect to the conveying direction is small, When it is nearly parallel, it is determined that tension-free rolling of the leading end of the metal plate is possible. Therefore, by starting tension-free rolling of the tip of the metal sheet according to this determination, it is possible to appropriately wind the rolled metal sheet by the winding device as described in (1) above.

(3) In some embodiments, in the configuration of (1) above,
When the difference between the reference position and the first plate end position in the width direction of the metal plate and the difference between the reference position and the second plate end position are within specified ranges, It is configured to determine that the tip tension-free rolling of the metal plate can be started.

The difference between the reference position and the first plate edge position in the plate width direction and the difference between the same reference position and the second plate edge position are the plate edge positions at the first position and the second position in the conveying direction, respectively. It indicates the magnitude of the deviation of the position from the reference position.
In this regard, according to the configuration (3) above, when the deviation of the first plate end position from the reference position and the deviation of the second plate end position from the reference position are relatively small, that is, the longitudinal direction of the metal plate When the inclination with respect to the conveying direction is small and nearly parallel, it is determined that tension-free rolling of the leading end of the metal plate is possible. Therefore, by starting tension-free rolling of the tip of the metal sheet according to this determination, it is possible to appropriately wind the rolled metal sheet by the winding device as described in (1) above.

(4) In some embodiments, in the configuration of any one of (1) to (3) above,
The control device of the rolling mill comprises:
Further comprising a rolling control unit for controlling the operation of the pair of rolling rolls,
When the determination unit determines that the tension-free rolling of the leading edge of the metal plate can be started, the rolling control unit brings the pair of rolls into contact with the metal plate, and then the pair of rolls. while rotating the pair of rolling rolls so that the gap between the pair of rolling rolls gradually decreases as the metal plate is conveyed until it reaches a control value corresponding to the target thickness of the metal plate. It is configured to adjust the number and the amount of reduction.

When the rolling of the metal plate by the rolling rolls and the tensionless rolling of the leading end are started with the leading end of the metal plate passed between the pair of rolling rolls, the leading end of the metal plate that is not rolled by the rolling rolls and the rolled There may be a large difference in plate thickness between the following part and the following part. In this case, when the metal plate is wound by the winding device, stress may concentrate on the boundary between the leading end portion and the trailing portion, and the metal plate may be cut at this boundary.

In this regard, according to the above configuration (4), when the leading end of the metal plate starts to be rolled without tension, after the pair of rolling rolls are brought into contact with the metal plate, the rolling rolls are rotated while rolling as the metal plate is conveyed. The number of rotations of the rolling rolls and the reduction amount are adjusted so that the gap between the rolls gradually decreases to a controlled value corresponding to the target thickness of the metal plate. Therefore, a transition portion in which the thickness gradually decreases is formed between the tip portion having the same thickness as before rolling and the trailing portion rolled to the target thickness. Therefore, it is possible to alleviate stress concentration that may occur at the boundary between the leading end portion and the trailing portion described above when the metal plate is wound by the winding device. As a result, the rolled metal sheet can be wound more appropriately by the winding device.

(5) In some embodiments, in the configuration of any one of (1) to (4) above,
The control device of the rolling mill comprises:
After the leading end tension-free rolling of the metal plate is started, when the detection result of the second plate end position by the second plate end detection unit deviates from the reference position to one side in the plate width direction, the roll from the rolling roll a first leveling section configured to perform roll-down leveling control of the pair of rolling rolls so that the outflow direction of the metal sheet is along the conveying direction of the metal sheet in the rolling mill;
After the reduction leveling control by the first leveling section, the outflow direction of the metal sheet from the rolling rolls is shifted to the other side in the sheet width direction with respect to the conveying direction, and then the outflow direction of the metal sheet is a second leveling unit configured to perform roll-down leveling control of the pair of rolling rolls so as to return to the conveying direction;
Prepare.

According to the above configuration (5), while the metal plate is rolled with no tension at the tip end, the plate end position of the metal plate in the plate width direction is detected at the position on the delivery side of the rolling rolls. Based on the fact that the detected plate end position deviates from the reference position to one side in the plate width direction, the outflow direction of the metal plate is displaced to one side in the plate width direction (tip bending of the metal plate). can be detected. Then, when the edge bending of the metal plate is detected, the outflow direction of the metal plate is aligned with the conveying direction of the metal plate in the rolling mill by the reduction leveling control, and then the outflow direction of the metal plate is changed to the conveying direction. After shifting to the other side in the width direction, the roll-down leveling control is performed so that the outflow direction follows the conveying direction. , tension-free rolling can be continued. Therefore, according to the above configuration (5), the metal sheet that has been tension-free rolled at the leading end can be properly wound up by the winding device.

(6) A rolling facility according to at least one embodiment of the present invention,
A pair of rolling rolls provided so as to sandwich the metal plate;
The control device according to any one of (1) to (5) above;
Prepare.

According to the configuration (6) above, at each of the first position on the entry side and the second position on the exit side of the pair of rolling rolls, the plate edge positions in the plate width direction of the metal plate (the first plate end position and the second position) 2 board end position) is detected. Therefore, based on these detection results, it is possible to grasp the degree of inclination of the metal plate in the longitudinal direction with respect to the conveying direction before the start of tension-free rolling at the tip. It is possible to grasp the degree of inclination of the outflow direction with respect to the conveying direction. In the above configuration (6), it is determined whether or not to start tensionless rolling at the tip based on the detection results of the first strip end position and the second strip end position. When it is determined that the longitudinal direction of the metal plate (that is, the outflow direction of the metal plate at the start of rolling) is substantially parallel to the conveying direction, tension-free rolling of the tip end of the metal plate can be started. can judge.
Therefore, according to the above configuration (6), since the leading end tension-free rolling can be started in a state in which the outflow direction and the conveying direction of the metal plate are substantially parallel, the leading end portion of the metal plate can be moved from the conveying line by the rolling mill to the width of the plate. It is possible to suppress deviating in the direction. For this reason, it becomes easy to wind up the rolled metal plate appropriately with a winding device.
In addition, according to the above configuration (6), the tip tension-free rolling can be started in a state in which the outflow direction and the conveying direction of the metal plate are substantially parallel. is used as a reference, it is possible to appropriately control the rolling mill, such as meandering control of the metal plate, based on the second plate end position detected during tensionless rolling of the tip.
Therefore, it is possible to appropriately wind up the metal sheet that has been tension-free rolled at the leading end by the winder.

(7) In some embodiments, in the configuration of (6) above,
The rolling equipment is
Further comprising a winding device provided downstream of the second plate end detection unit in the conveying direction,
When the distance in the conveying direction between the pair of rolling rolls and the winding device is L2, the distance in the conveying direction between the pair of rolling rolls and the second plate edge detection section is 0.1×L2. It is below.

In order to detect the plate end position (second plate end position) of the metal plate by the second plate end detection section arranged on the delivery side of the rolling roll, the position of the tip of the metal plate in the conveying direction must be detected by the second plate end position. It should be located at the same level as or downstream of the detector. In this regard, according to the above configuration (7), the distance between the second plate end detection unit and the rolling rolls in the conveying direction is relatively short, so that the tip position of the metal plate at the start of tensionless rolling is It is possible to detect the second strip end position at the start of tensionless rolling and during tensionless rolling while relatively close to the rolling rolls. Therefore, while the length of the tip portion of the metal plate that is not rolled is shortened, the tip tension-free rolling can be appropriately performed, thereby improving the yield of the metal plate.

(8) In some embodiments, in the configuration of (6) or (7) above,
The rolling equipment is
Further comprising an unwinding device provided on the upstream side of the first plate end detection unit in the conveying direction,
When the distance in the conveying direction between the pair of rolling rolls and the unwinding device is L1, the distance in the conveying direction between the pair of rolling rolls and the first strip edge detection section is 0.1×L1. It is below.

In the case of a rolling mill (reverse mill) that reciprocates and rolls a metal plate passed between a pair of rolling rolls, in the second pass after the first pass, the conveying direction of the metal plate is reversed, and the metal plate is moved backward. Rolling with rolling rolls is started from the end side. In this respect, according to the above configuration (8), the distance between the first plate edge detection unit and the rolling rolls is relatively short in the conveying direction in the second pass (opposite to the conveying direction in the first pass). Therefore, it is possible to detect the first plate end position at the start of tension-free rolling and during tension-free rolling while keeping the rear end position of the metal plate relatively close to the rolling rolls at the start of tension-free rolling in the second pass. is. Therefore, the length of the rear end portion of the metal plate that is not rolled can be shortened, and the front end can be appropriately tension-free rolled, thereby improving the yield of the metal plate.

(9) In some embodiments, in any of the above configurations (6) to (7),
The rolling equipment is
A plate thickness gauge provided on at least one of the entry side and the exit side of the pair of rolling rolls in the conveying direction and configured to measure the plate thickness of the metal plate,
The first strip edge detection section or the second strip edge detection section is positioned between the pair of rolling rolls and the strip thickness gauge in the conveying direction.

A plate thickness gauge used for controlling the plate thickness of the metal plate is preferably provided near the rolling rolls in the conveying direction in order to improve control response. In this respect, according to the configuration of (9) above, the first plate end detector or the second plate end detector is provided closer to the rolling rolls than the plate thickness gauge for measuring the plate thickness of the metal plate. Therefore, it is possible to detect the first plate end position or the second plate end position at the start of tension-free rolling and during tension-free rolling while bringing the tip position of the metal plate closer to the rolling rolls at the start of tension-free rolling. . Therefore, while the length of the tip portion of the metal plate that is not rolled is shortened, the tip tension-free rolling can be appropriately performed, thereby improving the yield of the metal plate.

(10) In some embodiments, in any of the above configurations (6) to (9),
The first strip edge detection section or the second strip edge detection section is configured to detect the first strip edge position or the second strip edge position using radiation.

The vicinity of the rolling rolls is often a harsh environment, with a large amount of rolling oil and fumes scattering, rolling rolls vibrating, and being dark. In this regard, according to the configuration (10) above, since the first strip edge detection unit or the second strip edge detection unit that detects the strip edge position using radiation is used, the rolling rolls under a severe environment , the plate end position can be detected appropriately.

(11) In some embodiments, in the configuration of any one of (6) to (10) above,
The rolling equipment is
A pair of first rolling rolls, which are the pair of rolling rolls;
a pair of second rolling rolls, which are the pair of rolling rolls, provided downstream of the pair of first rolling rolls in the conveying direction;
an unwinding device provided upstream of the pair of first rolling rolls;
a winding device provided downstream of the pair of second rolling rolls,
The control device determines whether or not the first tension-free rolling of the metal plate on the pair of first rolling rolls can be started, and it is determined that the first tension-free rolling of the tip can be started. and determining whether or not to start the second tension-free rolling of the metal plate on the pair of second rolls after the tension-free rolling on the front ends by the pair of first rolls is started. .

According to the configuration (11) above, in each of the first rolling roll and the second rolling roll arranged in the conveying direction, it is determined whether or not to start tensionless rolling at the tip described in (1) above. Since tension-free rolling at the leading end is started based on the determination result, the two pairs of rolling rolls can be properly wound up by the winding device while the metal sheet rolled without tension at the leading end by these rolling rolls can be wound appropriately. can be used to perform rolling more efficiently.

(12) A method for operating a rolling mill according to at least one embodiment of the present invention comprises:
A method of operating a rolling mill including a pair of rolling rolls provided to sandwich a metal plate,
a first plate end detection step of detecting a first plate end position, which is a plate end position in the plate width direction of the metal plate, at a first position on the entry side of the pair of rolling rolls in the conveying direction of the metal plate;
a second plate end detection step of detecting a second plate end position, which is a plate end position in the plate width direction of the metal plate, at a second position on the delivery side of the pair of rolling rolls in the conveying direction;
Delivery side tension of the metal plate based on the first plate end position detected in the first plate end detection step and the second plate end position detected in the second plate end detection step A determination step of determining whether or not to start tension-free rolling at the leading end, which is rolling of the metal plate by the pair of rolling rolls in a state where is zero;
Prepare.

According to the method (12) above, at each of the first position on the entry side and the second position on the exit side of the pair of rolling rolls, the plate edge positions in the width direction of the metal plate (the first plate end position and the second position) 2 board end position) is detected. Therefore, based on these detection results, it is possible to grasp the degree of inclination of the metal plate in the longitudinal direction with respect to the conveying direction before the start of tension-free rolling at the tip. It is possible to grasp the degree of inclination of the outflow direction with respect to the conveying direction. In the above method (12), it is determined whether or not to start tensionless rolling at the tip based on the detection results of the first strip end position and the second strip end position. When it is determined that the longitudinal direction of the metal plate (that is, the outflow direction of the metal plate at the start of rolling) is substantially parallel to the conveying direction, tension-free rolling of the tip end of the metal plate can be started. can judge.
Therefore, according to the above method (12), since the leading end tension-free rolling can be started in a state in which the outflow direction and the conveying direction of the metal plate are substantially parallel, the leading end portion of the metal plate extends from the conveying line of the rolling mill to the width of the plate. It is possible to suppress deviating in the direction. For this reason, it becomes easy to wind up the rolled metal plate appropriately with a winding device.
Further, according to the above method (12), the tip tension-free rolling can be started in a state in which the outflow direction and the conveying direction of the metal plate are substantially parallel. is used as a reference, it is possible to appropriately control the rolling mill, such as meandering control of the metal plate, based on the second plate end position detected during tensionless rolling of the tip.
Therefore, it is possible to appropriately wind up the metal sheet that has been tension-free rolled at the leading end by the winder.

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 Rolling Roll 6 Entrance Pinch Roll 8 Side Guide 10 Rolling Mill 10A First Rolling Mill 10B Second Rolling Mill 12 Exit Pinch Roll 14 Winding Device 15 Rolling Roll 15A First Rolling Roll 15B Second rolling roll 16 Rolling roll 16A First rolling roll 16B Second rolling roll 17 Intermediate roll 18 Intermediate roll 19 Backup roll 20 Backup roll 22 Rolling down device 30 Metal plate 32 First plate edge detector 32A First plate edge detector Section 32B First strip edge detection section 34 Second strip edge detection section 34A Second strip edge detection section 34B Second strip edge detection section 36 Strip thickness gauge 38 Strip thickness gauge 40 Controller 42 Judgment section 44 Rolling control section 46 First leveling Part 48 Second leveling part 50 Difference calculation part 52 Deviation angle calculation part 54 Time calculation part 90 Metal plate 90a Tip part 90b Transition part 90c Trailing part 91 Tip 92 First edge 93 Second edge 94 First surface 95 Second Surface 100 Control device A1 Rectangular part Lc Center line O Central axis S2A' Area S2B' Area Y1 First position Y2 Second position m Distance x1 First plate end position x2 Second plate end position x _B plate end position x _ref reference position Δe Deviation amount θ1 First deviation angle θ2 Second deviation angle

Claims (10)

A control device for controlling a rolling mill including a pair of rolling rolls provided to sandwich a metal plate,
A first plate provided on the entry side of the pair of rolling rolls in the conveying direction of the metal plate and configured to detect a plate end position in the width direction of the metal plate at the first position in the conveying direction. an edge detector;
A second plate end detection unit provided on the delivery side of the pair of rolling rolls in the conveying direction and configured to detect a plate end position in the plate width direction of the metal plate at a second position in the conveying direction. When,
Based on the first plate end position of the metal plate detected by the first plate end detection unit and the second plate end position of the metal plate detected by the second plate end detection unit, the a determining unit configured to determine whether or not to start tension-free rolling of the metal plate, which is rolling of the metal plate by the pair of rolling rolls in a state where the tension on the delivery side of the metal plate is zero;
A control device for a rolling mill comprising: The determination unit is configured to determine that the tension-free rolling of the leading end of the metal plate can be started when a difference between the first plate end position and the second plate end position is within a specified range. A control device for a rolling mill according to claim 1. When the difference between the reference position and the first plate end position in the width direction of the metal plate and the difference between the reference position and the second plate end position are within specified ranges, 2. A control device for a rolling mill according to claim 1, configured to determine that said tip tensionless rolling of said metal plate can be started. Further comprising a rolling control unit for controlling the operation of the pair of rolling rolls,
When the determination unit determines that the tension-free rolling of the leading edge of the metal plate can be started, the rolling control unit brings the pair of rolls into contact with the metal plate, and then the pair of rolls. while rotating the pair of rolling rolls so that the gap between the pair of rolling rolls gradually decreases as the metal plate is conveyed until it reaches a control value corresponding to the target thickness of the metal plate. 4. A control device for a rolling mill according to any one of claims 1 to 3, configured to adjust the number and the amount of rolling reduction. After the leading end tension-free rolling of the metal plate is started, when the detection result of the second plate end position by the second plate end detection unit deviates from the reference position to one side in the plate width direction, the roll from the rolling roll a first leveling section configured to perform roll-down leveling control of the pair of rolling rolls so that the outflow direction of the metal sheet is along the conveying direction of the metal sheet in the rolling mill;
After the reduction leveling control by the first leveling section, the outflow direction of the metal sheet from the rolling rolls is shifted to the other side in the sheet width direction with respect to the conveying direction, and then the outflow direction of the metal sheet is a second leveling unit configured to perform roll-down leveling control of the pair of rolling rolls so as to return to the conveying direction;
The rolling mill control device according to any one of claims 1 to 4, comprising: A pair of rolling rolls provided so as to sandwich the metal plate;
A control device according to any one of claims 1 to 5;
rolling equipment. A plate thickness gauge provided on at least one of the entry side and the exit side of the pair of rolling rolls in the conveying direction and configured to measure the plate thickness of the metal plate,
7. The first strip edge detector or the second strip edge detector according to claim 6, wherein the pair of rolling rolls is closer to the thickness gauge than the thickness gauge in the conveying direction, or the thickness gauge is provided at the same position as the thickness gauge. rolling equipment. The rolling according to claim 6 or 7, wherein the first strip edge detection unit or the second strip edge detection unit is configured to detect the first strip edge position or the second strip edge position using radiation. Facility. A pair of first rolling rolls, which are the pair of rolling rolls;
a pair of second rolling rolls, which are the pair of rolling rolls, provided downstream of the pair of first rolling rolls in the conveying direction;
an unwinding device provided upstream of the pair of first rolling rolls;
a winding device provided downstream of the pair of second rolling rolls,
The control device determines whether or not the first tension-free rolling of the metal plate on the pair of first rolling rolls can be started, and it is determined that the first tension-free rolling of the tip can be started. and determining whether or not to start the second tension-free rolling of the metal plate by the pair of second rolls after the tension-free rolling of the front ends by the pair of first rolls is started. Rolling equipment according to any one of claims 6 to 8. A method of operating a rolling mill including a pair of rolling rolls provided to sandwich a metal plate,
a first plate end detection step of detecting a first plate end position, which is a plate end position in the plate width direction of the metal plate, at a first position on the entry side of the pair of rolling rolls in the conveying direction of the metal plate;
a second plate end detection step of detecting a second plate end position, which is a plate end position in the plate width direction of the metal plate, at a second position on the delivery side of the pair of rolling rolls in the conveying direction;
Delivery side tension of the metal plate based on the first plate end position detected in the first plate end detection step and the second plate end position detected in the second plate end detection step A determination step of determining whether or not to start tension-free rolling at the leading end, which is rolling of the metal plate by the pair of rolling rolls in a state where is zero;
A method of operating a rolling mill comprising

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