Control device for rolling device, rolling facility, and operating method for rolling device

Abstract

A control device for controlling a rolling device including a pair of rolling rollers for rolling a metal plate includes: a first plate end detection unit configured to detect a plate end position in a plate width direction of the metal plate at a first position on an exit side of the pair of rolling rollers in a conveying direction of the metal plate; a second plate end detection unit configured to detect a plate end position in a plate width direction of the metal plate at a second position downstream of the first position in the conveyance direction; and a leveling adjustment unit configured to adjust the leveling of the metal plate on the basis of 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. In this way, the leveling of the pair of rolling rollers that roll the metal plate in a state in which the tension on the exit side of the metal plate is zero is adjusted.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a control device for a rolling device, a rolling apparatus, and a method for operating a rolling device. BACKGROUND

[0002] In rolling of a metal sheet using a rolling mill including a pair of rolling rolls, in order to improve yield, sometimes rolling of the metal sheet is performed in a state where no tension is applied to the front end of the metal sheet (front end tensionless rolling) before the front end of the metal sheet is wound by a coiler, in a state where no tension is applied to the front end of the metal sheet on the out side of the rolling mill.

[0003] In Patent Literature 1, there is described a rolling apparatus provided with sheet end detection sections respectively provided on the in side and the out side of a pair of rolling rolls (rolling mill). In the rolling apparatus, based on the sheet end positions in the sheet width direction at the in side and the out side of the rolling mill detected by the sheet end detection sections, it is determined whether the metal sheet is parallel with respect to the conveying direction (rolling pass line), and the front end tensionless rolling is started when the metal sheet is substantially parallel with respect to the conveying direction. In addition, after the rolling of the metal sheet is started, the sheet end position in the sheet width direction on the out side of the rolling mill is used to perform a leveling adjustment, thereby suppressing the inclination of the metal sheet with respect to the conveying direction. In this way, the front end of the metal sheet is guided to the coiler while suppressing the inclination of the metal sheet.

[0004] PRIOR ART DOCUMENTS

[0005] PATENT LITERATURE

[0006] Patent Literature 1: Japanese Patent No. 7150994 SUMMARY

[0007] PROBLEMS TO BE SOLVED BY THE INVENTION

[0008] However, in the rolling apparatus of Patent Literature 1, since the front end tensionless rolling is started after the orientation of the metal sheet is made substantially parallel with respect to the conveying direction, time is required for adjusting the orientation of the metal sheet before the rolling is started. Therefore, there is room for improvement in terms of productivity.

[0009] In view of the above, it is an object of at least one embodiment of the present invention to provide a control device for a rolling device, a rolling apparatus, and a method for operating a rolling device, which can quickly start rolling of a metal sheet in a state where the out side tension of the metal sheet is zero (front end tensionless rolling).

[0010] MEANS FOR SOLVING THE PROBLEMS

[0011] The control device for a rolling device according to at least one embodiment of the present invention is used to control a rolling device including a pair of rolling rolls for rolling a metal sheet, wherein

[0012] The control device for the rolling device has:

[0013] a first plate end detection section configured to detect a plate end position of the metal plate in a plate width direction at a first position on an out side of the pair of rolling rolls in a conveyance direction of the metal plate;

[0014] a second plate end detection section configured to detect a plate end position of the metal plate in the plate width direction at a second position on a downstream side of the first position in the conveyance direction; and

[0015] a leveling adjustment section configured to adjust a leveling of the pair of rolling rolls in a state where a tension on the out side of the metal plate is zero, based on the first plate end position of the metal plate detected by the first plate end detection section and the second plate end position of the metal plate detected by the second plate end detection section.

[0016] Further, the rolling apparatus of at least one embodiment of the present application has:

[0017] a rolling device including a pair of rolling rolls for rolling a metal plate; and

[0018] the above-described control device configured to control the rolling device.

[0019] Further, the operation method of the rolling device of at least one embodiment of the present application is an operation method of a rolling device including a pair of rolling rolls for rolling a metal plate, in which,

[0020] the operation method of the rolling device includes:

[0021] a first plate end detection step of detecting a plate end position of the metal plate in a plate width direction at a first position on an out side of the pair of rolling rolls in a conveyance direction of the metal plate;

[0022] a second plate end detection step of detecting a plate end position of the metal plate in the plate width direction at a second position on a downstream side of the first position in the conveyance direction; and

[0023] a step of adjusting a leveling of the pair of rolling rolls in a state where a tension on the out side of the metal plate is zero, based on the first plate end position of the metal plate detected in the first plate end detection step and the second plate end position of the metal plate detected in the second plate end detection step.

[0024] Effects of the Invention

[0025] According to at least one embodiment of the present application, a control device for a rolling device capable of rapidly starting rolling of a metal sheet in a state where the exit side tension of the metal sheet is zero (front end tensionless rolling), a rolling apparatus, and a method of operating the rolling device are provided. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a schematic configuration diagram of a rolling apparatus provided with the control device of one embodiment.

[0027] Figure 2 is a schematic configuration diagram of the control device of one embodiment.

[0028] Figure 3 is a schematic view of a metal sheet in a rolling apparatus as viewed from above.

[0029] Figure 4 is a schematic view of a metal sheet in a rolling apparatus as viewed from above.

[0030] Figure 5 is a flowchart showing an example of the method of operating the rolling device of one embodiment.

[0031] Figure 6 is a flowchart showing an example of the method of operating the rolling device of one embodiment.

[0032] Figure 7 is a graph showing an example of the relationship between the difference δ of the first and second sheet end positions and the offset amount D.

[0033] Figure 8 is a graph showing an example of the relationship between the difference δ of the first and second sheet end positions and the offset amount D. DETAILED DESCRIPTION

[0034] Hereinafter, several embodiments of the present application will be described with reference to the drawings. However, the sizes, materials, shapes, relative arrangements, and the like of the constituent parts described as embodiments or shown in the drawings are not intended to limit the scope of the present application thereto, but are merely illustrative.

[0035] (Structure of Rolling Apparatus and Control Device)

[0036] Figure 1 is a schematic configuration diagram of a rolling apparatus provided with the control device of one embodiment. Figure 2 is a schematic configuration diagram of the control device of one embodiment.

[0037] As shown in Figure 1 , the rolling apparatus 1 is provided with a rolling device 2 for rolling a metal sheet S and a control device 100 for controlling the rolling device 2. In several embodiments, the rolling device 2 may, for example, be as shown in Figure 1The rolling apparatus 2 shown includes a single rolling mill 10, or can include a plurality of rolling mills arranged in the conveying direction of the metal sheet.

[0038] Figure 1 The rolling apparatus 2 shown is a rolling apparatus (reversing mill) that rolls a metal sheet S by reciprocating the metal sheet S between a pair of rolling rollers 15, 16. Figure 1 The rolling apparatus 2 shown includes a rolling mill 10 including a pair of rolling rollers (work rollers) 15, 16 disposed so as to sandwich a metal sheet S as a rolling material, a coiler 4 disposed on the entry side of the rolling rollers 15, 16 in the advancing direction of the metal sheet S, and a recoiler 14 disposed on the exit side of the rolling rollers 15, 16 in the advancing direction of the metal sheet S, and is configured to roll the metal sheet S using the pair of rolling rollers 15, 16.

[0039] The rolling mill 10 includes, in addition to the pair of rolling rollers (work rollers) 15, 16, a pair of intermediate rollers 17, 18 and a pair of backup rollers 19, 20 disposed on the side opposite the metal sheet S so as to sandwich the pair of rolling rollers 15, 16, respectively. The intermediate rollers 17, 18 and the backup rollers 19, 20 are configured to support the rolling rollers 15, 16. In addition, the rolling mill 10 is provided with a screwdown device 22 for applying a load to the pair of rolling rollers 15, 16 to press down the metal sheet S sandwiched by the pair of rolling rollers 15, 16. The screwdown device 22 can also include a hydraulic cylinder.

[0040] Motors (not shown) are connected to the rolling rollers 15, 16 via a main shaft (not shown) or the like, and the rolling rollers 15, 16 are driven to rotate by the motors. When rolling the metal sheet S, the rolling rollers 15, 16 are rotated by the motors while the metal sheet S is pressed down by the screwdown device 22, whereby a frictional force is generated between the rolling rollers 15, 16 and the metal sheet S, and the metal sheet S is conveyed toward the exit side of the rolling rollers 15, 16 by the frictional force.

[0041] The coiler 4 is configured to coil the metal sheet S toward the rolling mill 10. The recoiler 14 is configured to take up the metal sheet S from the rolling mill 10. The coiler 4 and the recoiler 14 are each driven by a motor (not shown).

[0042] The coiler 4 is configured to apply an entry side tension to the metal sheet S when rolling the metal sheet S. In addition, the recoiler 14 is configured to apply an exit side tension to the metal sheet S when rolling the metal sheet S. That is, by appropriately driving the coiler 4 and the recoiler 14 by the motors, the entry side tension and the exit side tension are applied to the metal sheet S. By appropriately applying the entry side tension and the exit side tension to the metal sheet S, the bending of the metal sheet S during rolling can be suppressed.

[0043] Note that, after the rolling of the odd number of times (first rolling pass, etc.) is completed in a state where the metal sheet S is pressed by the rolling rolls 15, 16, just before the metal sheet S is to be unrolled from the unrolling machine 4, the metal sheet S is unrolled from the coiling machine 14 toward the rolling machine 10, and the even number of times (second rolling pass, etc.) of rolling is performed while the metal sheet S is coiled by the unrolling machine 4 and the metal sheet S is made to travel in the opposite direction to the immediately preceding direction of travel. That is, the function of the unrolling machine 4 and the function of the coiling machine 14 are switched depending on the direction of travel of the metal sheet S.

[0044] Figure 1 The rolling device 2 shown also includes an entry side pinch roll 6 and a side guide 8 for guiding the metal sheet S introduced from the unrolling machine 4 toward the rolling machine 10, and an exit side pinch roll 12 for guiding the metal sheet S conveyed from the rolling machine 10 toward the coiling machine 14.

[0045] As shown in Figure 1 , the control device 100 for controlling the rolling device 2 includes a first sheet end detection section 32 and a second sheet end detection section 34 for detecting the sheet end position in the sheet width direction of the metal sheet S, and a controller 40 configured to control the operation of the rolling device 2 based on the detection results of the first sheet end detection section 32 and the second sheet end detection section 34.

[0046] Here, Figure 3 and Figure 4 are schematic views of the metal sheet S in the rolling apparatus 1 from above. In Figure 3 and Figure 4 , the metal sheet S has a front end St and a sheet end Se A , Se B in the sheet width direction. In Figure 3 and Figure 4 , the metal sheet S when it reaches the coiling machine 14 is indicated by a double-dotted line. In Figure 3 , the orientation of the metal sheet S (the lengthwise direction of the metal sheet S) is substantially parallel to the direction of conveyance, and the position of the sheet end Se A is substantially in agreement with the target sheet end position X A . In Figure 4 , the orientation of the metal sheet S is inclined with respect to the direction of conveyance. Also, in Figure 3 and Figure 4 , the position of the rolling rolls 15, 16 in the direction of conveyance of the metal sheet S is indicated by lx0, and the position of the coiling machine 14 is indicated by lx3.

[0047] The first sheet end detection section 32 is configured to detect a first sheet end position xl, which is a first position lx1 on the exit side of the pair of rolling rolls 15, 16 in the direction of conveyance of the metal sheet S (see Figure 3 and Figure 4The second plate end detection unit 34 is configured to detect the second plate end position x2, which is the plate end position of the metal plate S in the width direction at the second position lx2, which is downstream of the first position lx1 in the conveying direction. That is, both the first position lx1 and the second position lx2 are positions on the exit side of a pair of rolling rolls 15 and 16 in the conveying direction.

[0048] The control device 100 may also be equipped with a function to detect the end position x3 and the target end position X of the metal plate S in the winding machine 14. A The difference is the offset D (refer to) Figure 4 The offset detection unit 36. The offset D can also be the plate end position x3 of the front end St' of the metal plate S when the front end of the metal plate S reaches the winding machine 14 and the target plate end position X. A The difference (refer to) Figure 4 ).

[0049] The offset detection unit 36 ​​may, for example, include a device capable of capturing images of the end of the metal sheet S wound on the winding machine 14 in the width direction and / or indicating the target end position X. A The camera is marked with markers, etc. The target plate end position X is indicated. A The marking can also be set on the winding machine 14. The offset detection unit 36 ​​can also be configured to obtain the aforementioned offset D from the image obtained by the camera, etc.

[0050] The controller 40 is configured to receive signals from the first plate end detection unit 32, the second plate end detection unit 34 and / or the offset detection unit 36 ​​indicating the detection results of the first plate end position x1, the second plate end position x2 and / or the offset D, and control the operation of the motors used to drive the pressing device 22 and the rolling rolls 15 and 16 based on these detection results.

[0051] The controller 40 may also include a processor (CPU, etc.), memory (RAM), auxiliary storage, and an interface. The controller 40 receives signals from the first board-side detection unit 32 and the second board-side detection unit 34 via the interface. The processor is configured to process these received signals. Furthermore, the processor is configured to process programs deployed in the memory.

[0052] The processing content in controller 40 can also be loaded as a program executed by the processor and stored in auxiliary storage. When executing the program, these programs are expanded in memory. The processor reads the program from memory and executes the commands contained in the program.

[0053] like Figure 2As shown, the controller 40 of the control device 100 constituting one embodiment includes a leveling adjustment unit 42. Additionally, the controller 40 may also include a target value acquisition unit 44, a data acquisition unit 46, and / or a correlation acquisition unit 48.

[0054] The leveling adjustment unit 42 is configured to adjust the leveling of a pair of rolling rolls 15 and 16 rolling the metal plate S when the tension on the exit side of the metal plate S is zero (i.e., when there is no tension at the front end), based on the first end position x1 of the metal plate S detected by the first end detection unit 32, the second end position x2 of the metal plate S detected by the second end detection unit 34, and / or the offset D detected by the offset detection unit 36. It should be noted that the leveling of the pair of rolling rolls 15 and 16 is the difference in the roll gap (roll clearance) at both ends of the pair of rolling rolls 15 and 16. The leveling adjustment unit 42 can also be configured to adjust the leveling of the pair of rolling rolls 15 and 16 by adjusting the amount of reduction based on the reduction device 22.

[0055] The target value acquisition unit 44 is configured to be based on the difference δ between the first plate end position x1 detected by the first plate end detection unit 32 and the second plate end position x2 detected by the second plate end detection unit 34 (refer to...). Figure 4 The correlation between the offset D and the above-mentioned offset D is used to obtain the difference δ between the first plate end position x1 and the second plate end position x2, where the offset D becomes a predetermined value, as the target value δtgt of the difference δ. The above-mentioned correlation can also be obtained by the correlation acquisition unit 48 described later.

[0056] The data acquisition unit 46 is configured to acquire the difference δ between the first plate end position x1 and the second plate end position x2 and the offset D corresponding to the difference δ multiple times.

[0057] The correlation acquisition unit 48 is configured to acquire the correlation between the difference δ between the first plate end position x1 and the second plate end position x2 and the aforementioned offset D based on the plurality of differences δ and the plurality of offsets D acquired by the data acquisition unit 46.

[0058] (Operation control process of rolling mill)

[0059] The following describes the operation control of the rolling mill 2 by the control device 100 described above. However, the rolling mill 2 can also be operated manually by performing part or all of the processing of the control device 100 described below.

[0060] Figure 5 and Figure 6 These are flowcharts illustrating an example of an operation method of a rolling apparatus according to one embodiment.

[0061] exist Figure 5In the operation method shown in the flowchart, first, in the rolling device 2, the rolling of the metal sheet S is started in a state where the out-side tension of the metal sheet S is zero (endless tensionless rolling) (S2). Note that, during the endless tensionless rolling, the front end St of the metal sheet S is located on the downstream side of the rolling rolls 15, 16 and on the upstream side of the coiler 14 in the conveying direction (refer to FIG. 1). The endless tensionless rolling is performed until the front end St of the metal sheet S reaches the position of the first plate end detection section 32. Figure 3 and Figure 4 ).

[0062] Next, the first plate end position xl of the metal sheet S at the first position lx1 in the conveying direction is detected by the first plate end detection section 32, and the second plate end position x2 of the metal sheet S at the second position lx2 in the conveying direction is detected by the second plate end detection section 34 (S4). The controller 40 acquires the first plate end position xl and the second plate end position x2.

[0063] Next, the flattening adjustment section 42 adjusts the flattening of the pair of rolling rolls 15, 16 that rolls the metal sheet S in a state where the out-side tension of the metal sheet S is zero, based on the first plate end position xl of the metal sheet S detected by the first plate end detection section 32 and the second plate end position x2 of the metal sheet S detected by the second plate end detection section 34 (S6 to S10).

[0064] More specifically, the flattening adjustment section 42 acquires the difference δ of the first plate end position xl of the metal sheet S detected by the first plate end detection section 32 and the second plate end position x2 of the metal sheet S detected by the second plate end detection section 34 (δ = x2 - xl; refer to FIG. 2) (S6). Figure 4

[0065] Then, the flattening adjustment section 42 determines whether the difference δ of the first plate end position xl and the second plate end position x2 is within a prescribed range (S8). Then, in a case where the above difference δ is not within the prescribed range (NO in step S8), the flattening of the rolling rolls 15, 16 is changed so that the difference δ is within the prescribed range (S10).

[0066] Alternatively, in one embodiment, instead of the above steps S8 to S10, the difference δ of the first plate end position xl and the second plate end position x2 is acquired, and the flattening of the rolling rolls 15, 16 is adjusted in such a manner that the difference δ becomes smaller (i.e., in such a manner that the difference δ of the first plate end position xl and the second plate end position x2 approaches zero).

[0067] According to the above embodiment, in the rolling of the metal sheet S in a state where the out-side tension of the metal sheet S is zero (endless tensionless rolling), the flattening adjustment is performed based on the detection results of the plate end positions (the first plate end position xl and the second plate end position x2) at a plurality of positions (the first position lx1 and the second position lx2) on the out-side of the pair of rolling rolls 15, 16. Therefore, for example, as shown in FIG. 3, the difference δ of the first plate end position xl and the second plate end position x2 is small, and the flattening of the rolling rolls 15, 16 is adjusted in such a manner that the difference δ is within a prescribed range. Figure 4 ​As shown, even if the metal sheet S is assumed to be inclined with respect to the conveying direction at the start of the front-end tensionless rolling, by the above-described level adjustment, the inclination of the metal sheet S can be eliminated while the metal sheet S is being rolled. Thus, in the front-end tensionless rolling, the straightness of the metal sheet S can be maintained while the front end St of the metal sheet S is guided to the coiler 14, and the metal sheet S can be appropriately coiled by the coiler 14. Therefore, adjustment of the orientation of the metal sheet S at the start of the front-end tensionless rolling can be omitted, and thus the front-end tensionless rolling can be started promptly, and the productivity is improved.

[0068] In Figure 6 the operation method shown in the flowchart, first, in the rolling device 2, rolling of the metal sheet S is started in a state where the outgoing side tension of the metal sheet S is zero (front-end tensionless rolling) (S22; same as step S2 in Figure 5 ).

[0069] Next, the target value acquisition section 44 acquires a correlation between the difference δ of the first sheet end position xl detected by the first sheet end detection section 32 and the second sheet end position x2 detected by the second sheet end detection section 34, and the difference, i.e., the offset D, of the sheet end position x3 of the metal sheet S in the coiler 14 and the target sheet end position X A of the metal sheet S in the coiler 14. In addition, the target value acquisition section 44 acquires, from this correlation, a target value δtgt related to the difference δ of the first sheet end position xl and the second sheet end position x2, such that the offset D becomes a prescribed value (typically, zero) (S24).

[0070] The correlation between the difference δ of the first sheet end position xl and the second sheet end position x2 and the offset D can also be one acquired by the correlation acquisition section 48 based on the data of the first sheet end position xl, the second sheet end position x2, and the offset D acquired by the data acquisition section 46.

[0071] Figure 7 and Figure 8 are charts each showing an example of the correlation between the difference δ of the first sheet end position xl and the second sheet end position x2 (horizontal axis) and the offset D (vertical axis).

[0072] The correlation acquisition section 48 can also derive an approximate curve (curve L in Figure 7 and Figure 8 ) showing the plot of the combination of the difference δ of the first sheet end position xl and the second sheet end position x2 and the offset D, and acquire this approximate curve L as the correlation between the difference δ and the offset D. In addition, the target value acquisition section 44 can also acquire the value of δ at the intersection of the above-described approximate curve L and the horizontal axis representing δ, as the target value δtgt related to the above-described difference δ such that the offset D becomes zero as the prescribed value.

[0073] If there is no measurement error, setting error, etc. of the first sheet end detection section 32, the second sheet end detection section 34, and / or the offset amount detection section 36, as shown in Figure 7 , an approximate curve L showing the correlation between the difference δ of the first sheet end position xl and the second sheet end position x2 and the offset amount D passes through the origin (i.e., when the offset amount D is zero, the difference of the first sheet end position xl and the second sheet end position x2 is zero). In this case, the target value δtgt involved in the difference δ of the first sheet end position xl and the second sheet end position x2 when the offset amount D becomes zero (a prescribed value) is zero.

[0074] In reality, due to the measurement error, setting error, etc. of the first sheet end detection section 32, the second sheet end detection section 34, and / or the offset amount detection section 36, as shown in Figure 8 , in the above-described correlation between the difference δ and the offset amount D, when the offset amount D is zero, the difference δ of the first sheet end position xl and the second sheet end position x2 sometimes becomes δa deviating from zero. In this case, the target value δtgt involved in the difference δ of the first sheet end position xl and the second sheet end position x2 when the offset amount D becomes zero (a prescribed value) is δa.

[0075] Next, the first sheet end position xl of the metal sheet S at the first position lx1 in the conveyance direction is detected by the first sheet end detection section 32, and the second sheet end position x2 of the metal sheet S at the second position lx2 in the conveyance direction is detected by the second sheet end detection section 34 (S26; the same as step S4 in Figure 5 ). The controller 40 acquires the first sheet end position xl and the second sheet end position x2.

[0076] Next, the leveling adjustment section 42 adjusts the leveling of the pair of rolling rolls 15, 16 in which the metal sheet S is rolled in a state where the out-side tension of the metal sheet S is zero, using the first sheet end position xl of the metal sheet S detected by the first sheet end detection section 32, the second sheet end position x2 of the metal sheet S detected by the second sheet end detection section 34, and the above-described offset amount D (S28 to S30).

[0077] More specifically, the leveling adjustment section 42 acquires the difference δ of the first sheet end position xl of the metal sheet S detected by the first sheet end detection section 32 and the second sheet end position x2 of the metal sheet S detected by the second sheet end detection section 34 (S28).

[0078] Then, the leveling adjustment section 42 adjusts the leveling of the rolling rolls 15, 16 so that the difference δ of the first sheet end position xl and the second sheet end position x2 approaches the target value δtgt acquired in step S24 (i.e., the target value δtgt acquired based on the correlation between the difference δ of the first sheet end position xl and the second sheet end position x2 and the offset amount D).

[0079] The inventors conducted in-depth research and found that even if the actual plate end positions (first plate end position x1 and second plate end position x2) at the first position lx1 and the second position lx2 are not different, due to measurement errors and setting errors of the first plate end detection unit 32 and the second plate end detection unit 34, the detection results (measured values) of the first plate end position x1 and the second plate end position x2 based on these plate end detection units may sometimes differ. Regarding this, according to the above-described embodiment, in addition to using the detection results (first plate end position x1 and second plate end position x2) based on the first plate end detection unit 32 and the second plate end detection unit 34, the plate end position x3 of the metal plate S at the position of the winding machine 14 and the target plate end position x are also used. A The difference, i.e., the offset D, is used for leveling adjustment, thereby enabling more appropriate elimination of the tilt of the metal plate S relative to the conveying direction in front-end tensionless rolling.

[0080] For example, as described above, based on the correlation between the difference δ between the first plate end position x1 and the second plate end position x2 and the aforementioned offset D, a target value δtgt corresponding to a predetermined offset D (e.g., zero) is obtained, and a leveling adjustment is performed in a manner that brings the difference δ between the first plate end position x1 and the second plate end position x2 close to this target value δtgt, thereby enabling the offset D to approach a predetermined value (e.g., zero). This allows for more appropriate elimination of the tilt of the metal plate S relative to the conveying direction during front-end tensionless rolling.

[0081] In several embodiments, the data acquisition unit 46 is configured to repeatedly acquire the difference δ between the first plate end position x1 and the second plate end position x2 and the offset D, and the correlation acquisition unit 48 is configured to reacquire the correlation between the difference δ and the offset D (e.g., the approximate curve L mentioned above) whenever the data acquisition unit 46 acquires the above-mentioned difference δ and offset D.

[0082] The relationship between the difference δ between the first plate end position x1 and the second plate end position x2 and the aforementioned offset D may vary depending on the operating time and operating state of the rolling mill 1. In this regard, according to the above-described embodiment, during the operation of the rolling mill 1, data relating to the difference δ between the first plate end position x1 and the second plate end position x2 and the offset D corresponding to that difference δ are repeatedly acquired, and the aforementioned relationship is re-acquired using the newly acquired data (i.e., the relationship is updated). Therefore, leveling adjustments can be performed based on the aforementioned relationship corresponding to the state of the rolling mill 1, thus enabling more appropriate elimination of the tilt of the metal plate S relative to the conveying direction during tensionless rolling at the front end.

[0083] In several embodiments, the correlation acquisition unit 48 is configured to acquire the correlation using a plurality of the above-described differences δ and a plurality of the offset amounts D selected from the plurality of the above-described differences δ and the plurality of the offset amounts D acquired by the data acquisition unit 46.

[0084] According to the above-described embodiments, for the data related to the difference δ of the first plate end position xl and the second plate end position x2 acquired in the operation of the rolling apparatus 1 and the offset amount D corresponding to the difference δ, the latest data is used to acquire the above-described correlation, and thus the flattening adjustment can be performed based on the above-described correlation corresponding to the latest state of the rolling apparatus 1. Therefore, the inclination of the metal plate S with respect to the conveying direction can be more appropriately eliminated in the front-end tension-free rolling.

[0085] The content described in each of the above-described embodiments is grasped, for example, as follows.

[0086] [1] The control device (100) for a rolling apparatus according to at least one embodiment of the present application is a control device for controlling a rolling apparatus (2) including a pair of rolling rolls (15, 16) for rolling a metal plate (S), in which

[0087] The control device (100) for a rolling apparatus includes:

[0088] a first plate end detection unit (32) configured to detect a plate end position of the metal plate in a plate width direction at a first position (lx1) on an out side of the pair of rolling rolls in a conveying direction of the metal plate;

[0089] a second plate end detection unit (34) configured to detect a plate end position of the metal plate in the plate width direction at a second position (lx2) on a downstream side of the first position in the conveying direction; and

[0090] a flattening adjustment unit (42) configured to adjust flattening of the pair of rolling rolls for rolling the metal plate in a state where a tension on the out side of the metal plate is zero, based on the first plate end position (xl) of the metal plate detected by the first plate end detection unit and the second plate end position (x2) of the metal plate detected by the second plate end detection unit.

[0091] According to the structure of the above [1], in the rolling in a state where the tension on the exit side of the metal sheet is zero (front-end tensionless rolling), the flattening adjustment is performed based on the detection results of the sheet end positions (first sheet end position and second sheet end position) at a plurality of positions (first position and second position) on the exit side of the pair of rolling rolls, so even if the metal sheet is inclined with respect to the conveying direction at the start of the front-end tensionless rolling, the inclination of the metal sheet can be eliminated by the flattening adjustment described above while the metal sheet is being rolled. Thus, the metal sheet can be guided to the coiler with the straightness of the metal sheet being maintained in the front-end tensionless rolling, and the metal sheet can be appropriately coiled by the coiler. Therefore, the adjustment of the orientation of the metal sheet at the start of the front-end tensionless rolling can be omitted, so the front-end tensionless rolling can be started quickly, and the productivity is improved.

[0092] [2] In several embodiments, on the basis of the structure of the above [1],

[0093] The flattening adjustment section is configured to adjust the flattening in such a manner that the difference (δ) between the first sheet end position and the second sheet end position is within a prescribed range.

[0094] According to the structure of the above [2], in the rolling in a state where the tension on the exit side of the metal sheet is zero (front-end tensionless rolling), the flattening adjustment is performed in such a manner that the difference between the first sheet end position and the second sheet end position is within a prescribed range, so even if the metal sheet is inclined with respect to the conveying direction at the start of the front-end tensionless rolling, the inclination of the metal sheet can be appropriately eliminated by the flattening adjustment described above while the metal sheet is being rolled. Therefore, as described in the above [1], the front-end tensionless rolling can be started quickly, and the productivity is improved.

[0095] [3] In several embodiments, on the basis of the structure of the above [1] or [2],

[0096] The flattening adjustment section is configured to adjust the flattening in such a manner that the difference between the first sheet end position and the second sheet end position is reduced.

[0097] According to the structure of the above [3], in the rolling in a state where the tension on the exit side of the metal sheet is zero (front-end tensionless rolling), the flattening adjustment is performed in such a manner that the difference between the first sheet end position and the second sheet end position is reduced (i.e., in such a manner that the difference between the first sheet end position and the second sheet end position approaches zero), so even if the metal sheet is inclined with respect to the conveying direction at the start of the front-end tensionless rolling, the inclination of the metal sheet can be appropriately eliminated by the flattening adjustment described above while the metal sheet is being rolled. Therefore, as described in the above [1], the front-end tensionless rolling can be started quickly, and the productivity is improved.

[0098] [4] In several embodiments, on the basis of the structure of the above [1],

[0099] The flatness adjustment section is configured to adjust the flatness using a deviation (D) that is a difference between a plate end position (x3) of the metal sheet in a coiler (14) that coils the metal sheet after being rolled by the pair of rolling rolls and a target plate end position (X A

[0100] The present inventors and others have conducted intensive research, and as a result, it has been found that even if there is no difference in the plate end positions at the first and second positions in reality, due to measurement errors, setting errors, and the like of the first and second plate end detection sections, sometimes there is a difference in the detection results (measured values) of the first and second plate end positions based on these plate end detection sections. According to the structure of the above [4], in addition to the detection results (first and second plate end positions) of the first and second plate end detection sections, the flatness adjustment is performed using the deviation of the plate end position of the metal sheet at the position of the coiler from the target plate end position, and thus in front-end tensionless rolling, the inclination of the metal sheet with respect to the conveying direction can be more appropriately eliminated.

[0101] [5] In several embodiments, on the basis of the structure of the above [4],

[0102] The flatness adjustment section is configured to adjust the flatness based on a correlation between the difference between the first and second plate end positions and the deviation.

[0103] The present inventors and others have conducted intensive research, and as a result, it has been found that there is a correlation between the difference between the first plate end position (based on the detection result of the first plate end detection section) and the second plate end position (based on the detection result of the second plate end detection section) and the above deviation. According to the structure of the above [5], the flatness adjustment is performed based on the correlation between the difference between the first and second plate end positions and the above deviation, and thus in front-end tensionless rolling, the inclination of the metal sheet with respect to the conveying direction can be more appropriately eliminated.

[0104] [6] In several embodiments, on the basis of the structure of the above [5],

[0105] The control device has a target value acquisition section (44) configured to acquire, as a target value (δtgt), a difference between the first and second plate end positions at which the deviation becomes a prescribed value, based on the correlation,

[0106] The flatness adjustment section is configured to adjust the flatness in such a way that the difference between the first and second plate end positions approaches the target value.

[0107] ​According to the structure described in [6] above, based on the correlation between the difference between the first plate end position and the second plate end position and the offset, the difference between the first plate end position and the second plate end position at which the offset becomes a predetermined value (e.g., zero) is taken as a target value, and the flattening adjustment is performed in such a manner that the difference between the first plate end position and the second plate end position approaches the target value, so that the inclination of the metal plate with respect to the conveying direction can be more appropriately eliminated in the front-end tension-free rolling.

[0108] [7] In several embodiments, on the basis of the structure of any one of [4] to [6] above,

[0109] The control device has:

[0110] an offset detection section (36) for detecting the offset;

[0111] a data acquisition section (46) configured to acquire the difference between the first plate end position and the second plate end position and the offset corresponding to the difference respectively a plurality of times; and

[0112] a correlation acquisition section (48) configured to acquire the correlation based on the plurality of differences and the plurality of offsets acquired by the data acquisition section.

[0113] According to the structure described in [7] above, the difference between the first plate end position and the second plate end position in the operation of the rolling apparatus and the offset corresponding to the difference are acquired a plurality of times, and based on the data thus acquired, the correlation between the difference between the first plate end position and the second plate end position and the offset is acquired. Therefore, by performing the flattening adjustment based on the correlation, the inclination of the metal plate with respect to the conveying direction can be more appropriately eliminated in the front-end tension-free rolling.

[0114] [8] In several embodiments, on the basis of the structure of [7] above,

[0115] the data acquisition section is configured to repeatedly acquire the difference and the offset,

[0116] the correlation acquisition section is configured to newly acquire the correlation each time the data acquisition section acquires the difference and the offset.

[0117] The correlation between the difference between the first plate end position and the second plate end position and the above-described offset amount can vary depending on the operation time, operation state, and the like of the rolling apparatus. According to the structure of the above-described [8], the data relating to the difference between the first plate end position and the second plate end position and the offset amount corresponding to the difference are repeatedly acquired during the operation of the rolling apparatus, and the above-described correlation is reacquired using the newly acquired data (i.e., the correlation is updated). Thus, the flattening adjustment can be performed based on the above-described correlation corresponding to the state of the rolling apparatus, and thus the inclination of the metal plate with respect to the conveying direction can be more appropriately eliminated in the front-end tensionless rolling.

[0118] [9] In several embodiments, on the basis of the structure of the above-described [7] or [8],

[0119] The correlation acquisition section is configured to acquire the correlation using a plurality of the differences and a plurality of the offset amounts selected from the plurality of the differences and the plurality of the offset amounts acquired by the data acquisition section.

[0120] According to the structure of the above-described [9], for the data relating to the difference between the first plate end position and the second plate end position and the offset amount corresponding to the difference acquired during the operation of the rolling apparatus, the above-described correlation is acquired using the latest data, and thus the flattening adjustment can be performed based on the above-described correlation corresponding to the latest state of the rolling apparatus. Thus, the inclination of the metal plate with respect to the conveying direction can be more appropriately eliminated in the front-end tensionless rolling.

[0121]

[10] The rolling apparatus (1) of at least one embodiment of the present application includes:

[0122] a rolling device (2) including a pair of rolling rolls for rolling a metal plate; and

[0123] The control device (100) according to any one of the above-described [1] to [9] is configured to control the rolling device.

[0124] According to the structure described in

[10] above, in the rolling in a state where the tension on the exit side of the metal sheet is zero (front-end tensionless rolling), the flattening adjustment is performed based on the detection results of the sheet end positions (first sheet end position and second sheet end position) at a plurality of positions (first position and second position) on the exit side of the pair of rolling rolls, and thus even if the metal sheet is inclined with respect to the conveying direction at the start of the front-end tensionless rolling, the inclination of the metal sheet can be eliminated while the metal sheet is rolled by the flattening adjustment described above. Thus, it is possible to guide the front end of the metal sheet to the coiler while maintaining the straightness of the metal sheet in the front-end tensionless rolling, and the metal sheet can be appropriately coiled by the coiler. Therefore, it is possible to eliminate the adjustment of the orientation of the metal sheet at the start of the front-end tensionless rolling, and thus it is possible to quickly start the front-end tensionless rolling, and the productivity is improved.

[0125]

[11] The operation method of the rolling device of at least one embodiment of the present application is an operation method of a rolling device including a pair of rolling rolls for rolling a metal sheet, in which,

[0126] The operation method of the rolling device includes:

[0127] a first sheet end detection step (S4, S26) of detecting a sheet end position in the sheet width direction of the metal sheet at a first position on the exit side of the pair of rolling rolls in the conveying direction of the metal sheet;

[0128] a second sheet end detection step (S4, S26) of detecting a sheet end position in the sheet width direction of the metal sheet at a second position on the downstream side from the first position in the conveying direction; and

[0129] a flattening adjustment step (S8 to S10, S30) of adjusting the flattening of the pair of rolling rolls for rolling the metal sheet in a state where the tension on the exit side of the metal sheet is zero, based on the first sheet end position of the metal sheet detected in the first sheet end detection step and the second sheet end position of the metal sheet detected in the second sheet end detection step.

[0130] According to the method of the above

[11] , in the rolling in which the tension of the metal sheet at the exit side of the metal sheet is zero (front-end tensionless rolling), the flattening adjustment is performed based on the detection results of the sheet end positions (first sheet end position and second sheet end position) at a plurality of positions (first position and second position) of the exit side of the pair of rolling rolls, so that even if the metal sheet is inclined with respect to the conveying direction at the start of the front-end tensionless rolling, the inclination of the metal sheet can be eliminated while the metal sheet is rolled by the flattening adjustment. Thus, the metal sheet can be guided to the coiler with the straightness of the metal sheet maintained while the metal sheet is rolled in the front-end tensionless rolling, and the metal sheet can be appropriately coiled by the coiler. Therefore, the adjustment of the orientation of the metal sheet at the start of the front-end tensionless rolling can be omitted, so that the front-end tensionless rolling can be started quickly, and the productivity is improved.

[0131] The above describes the embodiments of the present application, but the present application is not limited to the above-described embodiments, and includes the embodiments in which the above-described embodiments are modified, and the embodiments in which the above-described embodiments are appropriately combined.

[0132] In the present specification, the expressions indicating relative or absolute arrangement such as "in a certain direction", "along a certain direction", "parallel", "orthogonal", "center", "concentric", or "coaxial" indicate not only such arrangement but also a state in which the angle, distance, or the like is relatively displaced within a tolerance or to a degree in which the same function can be obtained.

[0133] For example, the expressions indicating the state in which things are equal such as "same", "equal", and "homogeneous" indicate not only the state in which they are strictly equal but also the state in which there is a difference within a tolerance or to a degree in which the same function can be obtained.

[0134] In addition, in the present specification, the expressions indicating shapes such as quadrangular shape and cylindrical shape indicate not only the shapes in the strict geometrical sense but also shapes including concave-convex portions, chamfered portions, and the like within a range in which the same effect can be obtained.

[0135] In addition, in the present specification, the expressions such as "provided with", "including", or "having" one component are not exclusive expressions.

[0136] Explanation of Reference Numerals:

[0137] 1 Rolling apparatus

[0138] 2 Rolling device

[0139] 4 Uncoiler

[0140] 6 Inlet side pinch roll

[0141] 8 Side guide

[0142] 10 rolling mill

[0143] 12 exit pinch roll

[0144] 14 coiler

[0145] 15 rolling roll

[0146] 16 rolling roll

[0147] 17 intermediate roll

[0148] 18 intermediate roll

[0149] 19 backup roll

[0150] 20 backup roll

[0151] 22 reduction device

[0152] 32 first plate end detection section

[0153] 34 second plate end detection section

[0154] 36 offset amount detection section

[0155] 40 controller

[0156] 42 leveling adjustment section

[0157] 44 target value acquisition section

[0158] 46 data acquisition section

[0159] 48 correlation relationship acquisition section

[0160] 100 control device

[0161] D offset amount

[0162] L approximate curve

[0163] S metal plate

[0164] Se A plate end

[0165] Se B plate end

[0166] St front end

[0167] St' front end

[0168] X A target plate end position

[0169] lx1 first position

[0170] lx2 second position

[0171] x1 first strip end position

[0172] x2 second strip end position

[0173] x3 strip end position in the coiler 14

[0174] δtgt target value.

Claims

1. A control device for a rolling mill, used to control the rolling mill, the rolling mill comprising a pair of rolling rolls for rolling a metal sheet, wherein, The control device for the rolling mill includes: The first plate end detection unit is configured to detect the plate end position in the width direction of the metal plate at a first position on the exit side of the pair of rolling rolls in the conveying direction of the metal plate. The second plate end detection unit is configured to detect the plate end position of the metal plate in the width direction at a second position downstream of the first position in the conveying direction. as well as The leveling adjustment unit is configured to adjust the leveling of the pair of rolling rolls rolling the metal plate when the outward tension of the metal plate is zero, 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.

2. The control device for the rolling apparatus according to claim 1, wherein, The leveling adjustment unit is configured to adjust the leveling in such a way that the difference between the position of the first plate end and the position of the second plate end is within a specified range.

3. The control device for the rolling apparatus according to claim 1 or 2, wherein, The leveling adjustment unit is configured to adjust the leveling by reducing the difference between the position of the first plate end and the position of the second plate end.

4. The control device for the rolling mill according to claim 1, wherein, The leveling adjustment unit is configured to adjust the leveling using an offset, which is the difference between the end position of the metal sheet in a coiler for coiling the metal sheet after it has been rolled by the pair of rolling rolls and the target end position.

5. The control device for the rolling apparatus according to claim 4, wherein, The leveling adjustment unit is configured to adjust the leveling based on the correlation between the difference between the first plate end position and the second plate end position and the offset.

6. The control device for the rolling apparatus according to claim 5, wherein, The control device for the rolling mill includes a target value acquisition unit, which is configured to acquire, based on the correlation, the difference between the first plate end position and the second plate end position where the offset becomes a predetermined value as a target value. The leveling adjustment unit is configured to adjust the leveling in such a way that the difference between the position of the first plate end and the position of the second plate end is close to the target value.

7. The control device for a rolling mill according to any one of claims 4 to 6, wherein, The control device for the rolling mill includes: An offset detection unit is used to detect the offset. The data acquisition unit is configured to acquire, multiple times, the difference between the first plate end position and the second plate end position, and the offset corresponding to the difference; and The correlation acquisition unit is configured to acquire the correlation based on a plurality of differences and a plurality of offsets obtained by the data acquisition unit.

8. The control device for the rolling apparatus according to claim 7, wherein, The data acquisition unit is configured to repeatedly acquire the difference and the offset. The correlation acquisition unit is configured to reacquire the correlation whenever the data acquisition unit acquires the difference and the offset.

9. The control device for a rolling mill according to claim 7, wherein, The correlation acquisition unit is configured to acquire the correlation using a plurality of differences and offsets selected from the newer plurality of differences and offsets obtained by the data acquisition unit.

10. A rolling mill, wherein, The rolling equipment includes: A rolling apparatus comprising a pair of rolling rolls for rolling a sheet of metal; and The control device according to claim 1 or 2 is configured to control the rolling device.

11. A method of operating a rolling mill, the rolling mill comprising a pair of rolling rolls for rolling a metal sheet, wherein, The operation method of the rolling device includes: The first plate end detection step involves detecting the plate end position of the metal plate in the width direction at a first position on the exit side of the pair of rolling rolls in the conveying direction of the metal plate. The second plate end detection step involves detecting the plate end position in the width direction of the metal plate at a second position downstream of the first position in the conveying direction; and The leveling step of the pair of rolling rolls that roll the metal plate while the outward tension of the metal plate is zero is 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.

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