Rolling device control device, rolling equipment and rolling device operation method

Abstract

A control device for a rolling device, the rolling device having at least one rolling stand for rolling a metal plate, wherein the control device for the rolling device comprises: a detection signal acquisition unit for receiving a detection signal of an edge crack at an end portion of the metal plate in a plate width direction from an edge crack sensor; and a rolling condition determination unit for determining the rolling conditions of the rolling device, the rolling condition determination unit being configured to change the rolling conditions of the rolling device from a first rolling condition before the edge crack is detected to a second rolling condition capable of suppressing the expansion of the edge crack compared with the first rolling condition when the detection signal of the edge crack is received by the detection signal acquisition unit.

Description

Technical Field

[0001] The present invention relates to a control device of a rolling device, rolling equipment and an operating method of the rolling device. Background Art

[0002] In the process of manufacturing metal plates, edge cracks may occur at the ends of the metal plates in the plate width direction. If the edge cracks expand, there is a possibility that the plate will break, so it is necessary to appropriately detect the edge cracks.

[0003] Patent Document 1 discloses a method of detecting edge cracks of steel plates using an edge profiler installed on the output side of a rolling process line, thereby preventing plate breakage in a processing step downstream of the rolling process line (eg, a continuous annealing step).

[0004] Prior Art Literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Laid-Open No. 9-89809 Summary of the invention

[0007] Problems to be solved by the invention

[0008] However, during the rolling of the metal plate, the edge cracks will also expand, which may easily lead to the state of plate fracture. In this regard, in the method described in Patent Document 1, the edge cracks are only detected in the rolling line, so the expansion of the edge cracks during rolling and the plate fracture caused by the expansion of the edge cracks cannot be suppressed.

[0009] In view of the above circumstances, an object of at least one embodiment of the present invention is to provide a control device for a rolling device, a rolling equipment, and an operating method for a rolling device that can suppress the expansion of edge cracks during rolling.

[0010] Solutions to Solve Problems

[0011] A rolling equipment control device according to at least one embodiment of the present invention is a rolling equipment control device having at least one rolling stand for rolling a metal plate, wherein:

[0012] The control device of the rolling device comprises:

[0013] a detection signal acquisition unit for receiving a detection signal of an edge crack at an end portion in a plate width direction of the metal plate from an edge crack sensor; and

[0014] a rolling condition determination unit for determining the rolling conditions of the rolling device,

[0015] The rolling condition determination unit is configured to change the rolling condition of the rolling device from a first rolling condition before the edge crack is detected to a second rolling condition that can suppress the expansion of the edge crack compared to the first rolling condition when the detection signal of the edge crack is received by the detection signal acquisition unit.

[0016] Furthermore, a rolling facility according to at least one embodiment of the present invention includes:

[0017] a rolling device comprising at least one rolling stand for rolling metal plates;

[0018] an edge crack sensor configured to detect an edge crack at an end portion in a plate width direction of the metal plate during rolling by the rolling device; and

[0019] The above-mentioned control device is configured to control the rolling device based on the detection signal from the edge crack sensor.

[0020] In addition, a method for operating a rolling mill according to at least one embodiment of the present invention is a method for operating a rolling mill including at least one rolling stand, wherein:

[0021] The operation method of the rolling device comprises the following steps:

[0022] Rolling the metal plate using the rolling device;

[0023] detecting edge cracks at the end portions of the metal plate in the plate width direction during rolling by the rolling device; and

[0024] When an edge crack of the metal plate is detected, the rolling condition of the rolling device is changed from a first rolling condition before the edge crack is detected to a second rolling condition capable of suppressing the expansion of the edge crack compared to the first rolling condition.

[0025] Effects of the Invention

[0026] According to at least one embodiment of the present invention, there are provided a control device for a rolling device, a rolling equipment, and an operating method for a rolling device, which are capable of suppressing the expansion of edge cracks during rolling. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic configuration diagram of a rolling facility including a control device according to one embodiment.

[0028] Figure 2 This is a schematic configuration diagram of a rolling facility including a control device according to one embodiment.

[0029] Figure 3 This is a schematic configuration diagram of a rolling facility including a control device according to one embodiment.

[0030] Figure 4 The figure schematically shows edge cracks generated in a metal plate.

[0031] Figure 5 This is a schematic configuration diagram of a control device according to one embodiment.

[0032] Figure 6 This is a flowchart of a method for operating a rolling mill according to one embodiment.

[0033] Figure 7 yes Figure 6 An example of the flow of steps S200 to S300 is shown.

[0034] Figure 8 This is a flowchart of a method for operating a rolling mill according to one embodiment. DETAILED DESCRIPTION

[0035] Hereinafter, several embodiments of the present invention will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, and relative arrangements of the components described in the embodiments or shown in the drawings are not intended to limit the scope of the present invention, but are merely illustrative examples.

[0036] (Structure of rolling equipment)

[0037] First, the overall structure of a rolling mill including control devices according to several embodiments will be described. Figure 1 to Figure 3 Each of them is a schematic structural diagram of a rolling equipment equipped with a control device according to one embodiment. Figure 1 to Figure 3 As shown, the rolling equipment 1 includes: a rolling device 2, which is configured to roll a metal plate S; an edge crack sensor 30, which is used to detect edge cracks of the metal plate S; and a control device 50, which is used to control the rolling device 2 based on the detection signal from the edge crack sensor 30.

[0038] The rolling device 2 comprises at least one rolling stand 10 for rolling the metal sheet S. The rolling device 2 may be, for example, Figure 1 The rolling mill 10 shown here may also be a rolling mill 10. Figure 2 or Figure 3 The figure shows a plurality of rolling stands 10. It should be noted that Figure 2 In the illustrated embodiment, the rolling device 2 includes two rolling stands 10, and the two rolling stands 10 include rolling stands 10A and 10B. Figure 3 In the illustrated exemplary embodiment, the rolling device 2 includes four rolling stands 10 including rolling stands 10A to 10D.

[0039] The rolling stand 10 includes a pair of rolling rolls (work rolls) 15, 16 arranged to sandwich a metal sheet S as a rolling material, and a pair of intermediate rolls 17, 18 and a pair of backup rolls 19, 20, which sandwich the pair of rolling rolls 15, 16 and are arranged on the opposite side of the metal sheet S. The intermediate rolls 17, 18 and the backup rolls 19, 20 are configured to support the rolling rolls 15, 16. In addition, the rolling stand 10 includes a pressing device 22 (22A to 22D) for applying a load to the pair of rolling rolls 15, 16 to press down the metal sheet S. The pressing device 22 may also include a hydraulic cylinder.

[0040] The rolling rollers 15 and 16 are connected to a motor 11 (11A to 11D) via a main shaft (not shown) and the like, and the rolling rollers 15 and 16 are driven to rotate by the motor 11. When the metal plate S is rolled, the rolling rollers 15 and 16 are rotated by the motor while the metal plate S is pressed down by the pressing device 22, thereby generating a friction force between the rolling rollers 15 and 16 and the metal plate S, and the metal plate S is transported to the output side of the rolling rollers 15 and 16 by the friction force.

[0041] The rolling device 2 includes: an unwinding machine 4, which is used to unwind a coil of a metal plate S toward a rolling stand 10; and a winding machine 14, which is used to wind the metal plate S from the rolling stand 10. The unwinding machine 4 and the winding machine 14 are driven by motors (not shown), respectively. An input side clamping roller 6 for guiding the metal plate S introduced from the unwinding machine 4 to the rolling stand 10 may also be provided between the rolling stand 10 and the unwinding machine 4. An output side clamping roller 12 for guiding the metal plate S transported from the rolling stand 10 toward the winding machine may also be provided between the rolling stand 10 and the winding machine. It should be noted that in Figure 3 In the figure, the unwinder 4, the winder 14, the input-side pinch roller 6, and the output-side pinch roller 12 are omitted.

[0042] The rolling device 2 may also be a rolling device (reverse mill) that rolls the metal plate S passing through a pair of rolling rollers 15 and 16 by reciprocating. That is, the rolling device 2 as a reversible mill is configured to roll the metal plate S in multiple passes. When a reversible mill is used, during the odd-numbered rolling (first pass, etc.), the metal plate S is unwound from the unwinder 4 and wound up by the coiler 14 while rolling. Then, the rolling is stopped just before the tail end of the metal plate S unwound from the unwinder 4 is reached, and the odd-numbered rolling (first pass, etc.) is completed while the metal plate S is pressed down by the rolling rollers 15 and 16. Next, the metal plate S is unwound from the coiler 14 toward the rolling stand 10 and wound up by the unwinder 4 while the metal plate S is moved in the opposite direction of the previous rolling to perform the even-numbered rolling (second pass, etc.). That is, the role of the unwinder 4 and the role of the winder 14 are switched according to the traveling direction of the metal sheet S. It should be noted that Figure 1 and Figure 2 The rolling device 2 shown is a reversing rolling mill.

[0043] Alternatively, the rolling device 2 may be configured to roll the metal sheet S passing between the pair of rolling rollers 15 and 16 while advancing in one direction. Figure 3 The rolling apparatus shown is a tandem type rolling apparatus configured to roll a metal sheet S while advancing the metal sheet S in one direction.

[0044] The edge crack sensor 30 is configured to detect edge cracks at the ends (hereinafter referred to as ends) in the plate width direction (direction substantially perpendicular to the traveling direction) of the metal plate S. The detection signal (signal indicating the presence or absence of edge cracks) based on the edge crack sensor 30 is sent to the control device 50.

[0045] Here, Figure 4 is a schematic diagram showing edge cracks generated in the metal plate S ( Figure 4 The shaded area in the figure. Figure 4 As shown, the edge crack 90 is a defect generated at the end portion in the plate width direction of the metal plate S. The edge crack 90 generally has a shape that is recessed from the plate end E of the metal plate S toward the inside in the plate width direction.

[0046] In some embodiments, the edge crack sensor 30 is disposed at the downstream side of any one of the rolling stands 10 in the traveling direction of the metal sheet S. Figure 1 to Figure 3 In the exemplary embodiment shown in the figure, in the rolling stands 10 (10A to 10D) included in the rolling device 2, the rolling stand 10 located most upstream (in Figure 2 , Figure 3The edge crack sensor 30 is provided on the downstream side of the rolling stand 10A (in the figure). Figure 1 Rolling stand 10, Figure 2 , Figure 3 The rolling stand 10A) is the upstream side stand 7.

[0047] In some embodiments, the edge crack sensor 30 is disposed between a pair of rolling stands 10 in the traveling direction of the metal sheet S. Figure 2 and Figure 3 In the illustrated embodiment, an edge crack sensor 30 is provided between the rolling stand 10A located at the most upstream side and the rolling stand 10B next to it in the traveling direction of the metal sheet S. Here, the rolling stand 10 ( Figure 2 , Figure 3 The rolling stand 10B) is the downstream side stand 9.

[0048] It should be noted that the position of the edge crack sensor 30 and the number of the edge crack sensors 30 are not limited to Figure 1 to Figure 3 For example, in some embodiments, the edge crack sensor 30 may be disposed on the upstream side of any one of the rolling stands 10 in the traveling direction of the metal sheet S. In addition, in some embodiments, a plurality of edge crack sensors 30 may be disposed relative to the rolling device 2.

[0049] For example, in Figure 1 In the rolling device 2 shown in the figure, in addition to the edge crack sensor 30 shown in the figure, another edge crack sensor 30 can be provided on the upstream side of the rolling stand 10. Figure 2 In the rolling device 2 shown in the figure, in addition to the edge crack sensor 30 shown in the figure, an edge crack sensor 30 may be provided on the upstream side of the rolling stand 10A and / or the downstream side of the rolling stand 10B. Figure 3 In the rolling device 2 shown, the edge crack sensor 30 may also be provided between the rolling stand 10B and the rolling stand 10C and / or between the rolling stand 10C and the rolling stand 10D.

[0050] In some embodiments, the edge crack sensor 30 is configured to detect edge cracks using radiation (X-rays, etc.). Figures 1 to 3In the illustrated embodiment, the edge crack sensor 30 includes: a radiation generating unit 32 configured to generate radiation toward the end of the metal plate S in the plate width direction; and a radiation detecting unit 34 configured to be provided on the opposite side of the radiation generating unit 32 across the metal plate S and to receive radiation from the radiation generating unit 32. The edge crack sensor 30 is configured to detect edge cracks based on the range in the plate width direction where the radiation detecting unit 34 receives radiation.

[0051] In one embodiment, the radiation detection unit 34 includes a semiconductor element that outputs a signal when receiving radiation. In this case, since semiconductor elements are easily miniaturized, the edge crack sensor 30 can be miniaturized compared to, for example, a radiation detector having a gas chamber as a component, and even a small edge crack can be detected.

[0052] The semiconductor element mentioned above may be a CdTe (cadmium telluride)-based semiconductor element. Since a CdTe-based semiconductor element has high resolution, even a small edge crack can be easily and appropriately detected.

[0053] Figure 5 FIG. 5 is a schematic diagram of a control device 50 according to an embodiment of the present invention. The control device 50 is configured to receive a detection signal from the edge crack sensor 30 and control the operation of the rolling device 2 based on the detection signal. Figure 5 As shown, the control device 50 includes a detection signal acquisition unit 52 , a rolling condition determination unit 54 , and a control unit 56 .

[0054] The control device 50 includes a computer having a processor (CPU, etc.), a storage device (storage device, RAM, etc.), an auxiliary storage unit, and an interface. The control device 50 receives the detection signal from the edge crack sensor 30 via the interface. The processor is configured to process the signal received as above. In addition, the processor is configured to process the program developed in the storage device. Thus, the functions of the above-mentioned functional units (rolling condition determination unit 54, etc.) are realized.

[0055] The processing contents in the control device 50 are implemented as programs executed by the processor. The programs may also be stored in the auxiliary storage unit. When the programs are executed, the programs are expanded in the storage device. The processor reads the programs from the storage device and executes the commands included in the programs.

[0056] The detection signal acquisition unit 52 is configured to receive a detection signal (a signal indicating the presence or absence of an edge crack) from the edge crack sensor 30 .

[0057] The rolling condition determination unit 54 is configured to determine the rolling condition of the rolling device 2 based on the detection signal received by the detection signal acquisition unit 52. Here, the rolling condition may include the traveling speed of the metal sheet S or the tension of the metal sheet S.

[0058] The control unit 56 is configured to control the operation of the rolling device 2 so as to realize the rolling condition determined by the rolling condition determination unit 54. The control unit 56 may also be configured to control the motors 11 (11A to 11D) provided corresponding to the rolling stands 10 (10A to 10D), the roller bender 23 (23A to 23D) (in Figure 1 to Figure 3 Not shown), heater 24 (24A to 24D) or shift cylinder 26 (26A to 26D) (in Figure 1 to Figure 3 The action (not shown in the figure) is performed to achieve the above-mentioned rolling conditions.

[0059] It should be noted that the roller bender 23 is configured to press the axial ends of the rolling rollers 15 and 16 in the vertical direction to bend and deform the rolling rollers 15 and 16. When the rolling rollers 15 and 16 are deformed in this way and the ends of the metal sheet S being rolled are compressed, the material is stretched and the tension of the ends of the metal sheet S is reduced. The roller bender 23 may also include a hydraulic cylinder capable of pressing the ends of the rolling rollers 15 and 16 in the vertical direction.

[0060] The heater 24 is configured to heat the end of the metal plate S being rolled. When the end of the metal plate S is heated in this way, the temperature of the end of the metal plate S rises, the material stretches, and the tension of the end of the metal plate S decreases. The heater 24 may be configured to be disposed near the end of the metal plate S to heat the end of the metal plate S. Alternatively, the heater 24 may be configured to be disposed near the end of the rolling rollers 15 and 16 to indirectly heat the end of the metal plate S rolled by the rolling rollers 15 and 16 by heating the end of the rolling rollers 15 and 16. The heater 24 may also be configured to heat the end of the metal plate S using an electromagnetic induction coil, a heat medium, or a laser beam.

[0061] The shift cylinder 26 is configured to displace the rolling rollers 15 and 16 in the axial direction. In this case, the rolling rollers 15 and 16 have a tapered portion at the axial end, the front end of which tapers as it approaches the axial end. By displacing the rolling rollers 15 and 16 having the tapered portion toward the axial outer side, the tension at the end of the metal sheet S can be relieved. The shift cylinder 26 may also include a hydraulic cylinder capable of moving the rolling rollers 15 and 16 in the axial direction.

[0062] (Flow of the method for operating the rolling device)

[0063] The following describes the operation methods of the rolling devices of several embodiments. It should be noted that, the following describes the case where the operation of the rolling device of one embodiment is controlled by the above-mentioned control device 50, but in several embodiments, other devices may be used to operate the rolling device. Alternatively, in several embodiments, part or all of the operation methods described below may be performed by the operation of the operator.

[0064] Figure 6 This is a flow chart of a method for operating a rolling mill according to one embodiment. Figure 6 In the embodiment involved in the flowchart of , first, the rolling device 2 is operated under the first rolling condition to roll the metal plate S (S100). During the operation under the first rolling condition, the speed of the metal plate S in the traveling direction (travel speed) and the tension at the end of the metal plate S are respectively within a prescribed range. That is, in step S100, the rolling condition determination unit 54 sets the rolling condition of the rolling device 2 to the first rolling condition, and the control unit 56 controls the operation of the motor 11 of the rolling device 2, etc., to achieve the operation under the first rolling condition (the speed of the metal plate S and the tension at the end).

[0065] Next, the edge crack sensor 30 is used to detect the edge crack of the metal plate S (S200). In step S200, Figure 1 to Figure 3 As shown, it is possible to use a rolling mill set at any rolling mill stand 10 ( Figure 1 Rolling stand 10, Figure 2 and Figure 3 The edge crack is detected by the edge crack sensor 30 on the downstream side of the rolling stand 10A; that is, the upstream stand 7. In this case, since the edge crack is detected to some extent due to the upstream stand 7, the edge crack can be detected more reliably.

[0066] During the period when the edge crack is not detected by the edge crack sensor 30 (No in S200), the operation under the first rolling condition is continued (S100). After the edge crack is detected in step S200 (i.e., after the detection signal acquisition unit 52 receives the detection signal; Yes in S200), the operating condition of the rolling device 2 is changed from the first rolling condition to the second rolling condition that can suppress the expansion of the edge crack (S300).

[0067] That is, in step S300, the rolling condition determination unit 54 sets the rolling condition of the rolling device 2 to the second rolling condition. Furthermore, the control unit 56 controls the operation of the rolling device 2 to realize operation under the second rolling condition (speed of the metal plate S and tension at the end). In this way, when edge cracks at the ends of the metal plate S in the plate width direction are detected, the rolling condition of the rolling device 2 is changed to a rolling condition (second rolling condition) that can suppress the expansion of edge cracks during rolling and the plate breakage caused by the expansion of the edge cracks.

[0068] In one embodiment, during the operation of the rolling device 2 under the second rolling condition in step S300, the rolling device 2 is controlled so that the tension at the end of the metal plate S is smaller than the tension at the end of the metal plate S under the first rolling condition (the tension in step S100). Specifically, the roller bender 23, the heater 24, or the shift cylinder 26 provided corresponding to the rolling stand 10 is operated by the control unit 56 to obtain the desired tension. In this way, in step S300, the tension at the end of the metal plate S in the plate width direction is reduced compared to the operation under the first rolling condition, thereby effectively suppressing the expansion of edge cracks during rolling.

[0069] Alternatively, in one embodiment, during the operation of the rolling device 2 under the second rolling condition in step S300, the rolling device 2 is controlled so that the travel speed of the metal plate is smaller than the travel speed of the metal plate S under the first rolling condition (the travel speed in step S100). Specifically, the motor 11 of the rolling stand 10 is controlled by the control unit 56 to achieve the desired travel speed. In this way, by step S300, the travel speed of the metal plate S is reduced compared to the operation under the first rolling condition, thereby reducing damage to surrounding equipment and the like even if a plate breakage due to edge cracks occurs during rolling.

[0070] Next, it is determined whether the edge crack portion is wound by the winder 14 (S400). Here, the edge crack portion is wound by the winder 14 means that the edge crack portion is wound by the winder 14 once.

[0071] In step S400, the position of the edge crack portion can be calculated, and based on the calculation result, it can be determined whether the edge crack portion is wound by the winder 14. The position of the edge crack portion can be calculated based on, for example, the length of time from the moment when the detection signal acquisition unit 52 receives the detection signal (the detection signal indicating the presence of the edge crack) from the edge crack sensor 30, the speed of the metal sheet S, the distance between the edge crack sensor 30 and the winder 14, and the mandrel diameter of the winder 14. Alternatively, in step S400, a camera or other imaging device provided near the winder 14 can be used to photograph the metal sheet S wound on the winder 14, thereby determining whether the edge crack portion is wound by the winder 14.

[0072] In step S400, while it is not determined that the edge crack portion is wound by the coiler (No in S400), the operation under the second rolling condition is continued (S300). After it is determined that the edge crack portion is wound by the coiler in step S400 (Yes in S400), the operating condition of the rolling device 2 is restored from the second rolling condition to the first rolling condition and the rolling device 2 is operated (S100).

[0073] In this way, after the edge crack is detected, by maintaining the operation under the second rolling condition until the edge crack portion of the metal sheet S is wound by the coiler 14, it is possible to effectively suppress the detected edge crack from expanding during rolling.

[0074] In addition, as described above, after the edge crack portion is coiled by the coiler, by returning the rolling conditions from the second rolling conditions to the first rolling conditions, a decrease in production efficiency can be suppressed, and the expansion of the edge crack during rolling can be suppressed.

[0075] In some embodiments, in the case of a rolling device 2 comprising a plurality of rolling stands 10, in step S200 (see Figure 6 ), using the upstream rack 7 ( Figure 2 and Figure 3 The edge crack sensor 30 on the downstream side of the rolling stand 10A of the rolling mill 10A is used to detect the edge crack. After the edge crack is detected by the edge crack sensor 30 (Yes in S200), as described above, the operating condition of the rolling device 2 is changed from the first rolling condition to the second rolling condition that can suppress the expansion of the edge crack (S300). During the operation under the second rolling condition in step S300, the edge crack is not detected until the edge crack passes through the downstream side stand 9 ( Figure 2 and Figure 3The tension of the end of the metal sheet S in the area between the upstream side stand 7 and the downstream side stand 9 is made smaller than the tension under the first rolling condition until the rolling stand 10B of the upstream side stand 7 is reached. In addition, after the edge crack passes through the downstream side stand 9, the tension of the end of the metal sheet S in the area between the upstream side stand 7 and the downstream side stand 9 is restored to the tension under the first rolling condition (the tension in step S100).

[0076] In the above-mentioned embodiment, after the edge crack is detected, the tension of the end portion in the plate width direction in the region between the upstream side frame 7 and the downstream side frame 9 is made smaller than the tension under the first rolling condition until the edge crack portion passes through the downstream side frame 9, thereby suppressing the expansion of the edge crack during rolling. In addition, after the edge crack portion passes through the downstream side frame 9, the tension of the end portion in the plate width direction in the region between the upstream side frame 7 and the downstream side frame 9 is restored to the tension under the first rolling condition, thereby suppressing the reduction in production efficiency and suppressing the expansion of the edge crack during rolling.

[0077] Figure 7 The present invention relates to a rolling device 2 including a plurality of rolling stands 10 (see Figure 2 or Figure 3 ) is an example of the process of the above-mentioned steps S200 to S300. Figure 7 In the embodiment shown in FIG. 1 , in step S200, the upstream rack 7 ( Figure 2 and Figure 3 After the edge crack sensor 30 on the downstream side of the rolling stand 10A detects the edge crack (S202), step S300 is performed in the following order.

[0078] First, lower the upstream side frame 7 ( Figure 2 and Figure 3 Specifically, the control unit 56 operates the roller bender 23, the heater 24 or the shift cylinder 26 corresponding to the upstream side stand 7 (rolling stand 10A) and each rolling stand 10 (10B to 10D) located downstream of the upstream side stand 7, so as to obtain a tension smaller than the tension under the first rolling condition in each area between a pair of adjacent rolling stands 10 (for example, the area between the rolling stands 10A and 10B or the area between the rolling stands 10B and 10C, etc.).

[0079] Next, the edge crack portion passes through the rolling stand 10 ( Figure 2 and Figure 3After the rolling stand 10B (Yes in S306), the tension of the end of the metal sheet S in the area between the rolling stand 10 (rolling stand 10B) and the rolling stand (rolling stand 10A) located on the upstream side thereof is restored to the same tension as the first rolling condition (S308). In this way, the edge crack portion passes through the rolling stand 10 on the most downstream side (final stand; Figure 2 Rolling stand 10B, Figure 3 The operation of restoring the tension of the end of the metal sheet S in the area between the rolling stand 10 through which the edge crack passes and the rolling stand 10 adjacent to it on the upstream side is repeated until the rolling stand 10D through which the edge crack passes (No in S310, S312). After the edge crack passes through the final stand (Yes in S310), step S300 is terminated and the process proceeds to step S400 (refer to Figure 6 ).

[0080] In the above-mentioned embodiment, the tension of the end of the metal sheet S in the area between the rolling stand 10 and the adjacent rolling stand 10 on the upstream side is made smaller than the tension under the first rolling condition until the detected edge crack portion passes through the rolling stand 10 on the downstream side, thereby suppressing the expansion of the edge crack during rolling. In addition, after the edge crack portion passes through the rolling stand 10 on the downstream side, the tension of the end of the metal sheet S in the area between the rolling stand 10 and the adjacent rolling stand 10 on the upstream side is restored to the tension under the first rolling condition, thereby suppressing the reduction in production efficiency and suppressing the expansion of the edge crack during rolling.

[0081] The rolling device 2 is a reversing rolling mill configured to perform a plurality of passes of rolling of the metal sheet S (see Figure 1 and Figure 2 ), the rolling condition determination unit 54 can determine the rolling conditions of the metal plate S after the next pass performed by the rolling device 2 based on the detection results received from the edge crack sensor 30 during the rolling of the rolling device 2.

[0082] In this way, by determining the rolling conditions for the next pass and thereafter based on the detection result of the edge crack sensor 30 during rolling, it is possible to suppress the expansion of edge cracks and plate breakage during the next pass and thereafter.

[0083] In one embodiment, the rolling condition determination unit 54 is configured to determine whether to perform the next pass rolling of the metal plate S by the rolling device 2 based on the size of the edge crack of the metal plate S detected by the edge crack sensor 30. Here, the size of the edge crack may be the length W of the edge crack 90 in the plate width direction of the metal plate S (see Figure 4 ), or the length L of the edge crack 90 in the longitudinal direction (travel direction) of the metal plate S (refer to Figure 4 ).

[0084] In the above-described embodiment, since whether or not to perform the next rolling pass is determined based on the size of the detected edge crack, it is possible to effectively suppress the expansion of the edge crack and the plate breakage in the next and subsequent rolling passes.

[0085] In one embodiment, the rolling condition determination unit 54 is configured to determine the timing of changing the rolling conditions of the metal plate S in the next rolling by the rolling device 2 based on the position of the edge crack in the longitudinal direction of the metal plate S detected by the edge crack sensor 30.

[0086] In the above-mentioned embodiment, since the timing of changing the rolling conditions in the next rolling pass is determined based on the position of the detected edge crack in the length direction of the metal plate, it is possible to suppress the reduction in production efficiency and the expansion of the edge crack during rolling.

[0087] Figure 8 This is a flowchart of an operating method of the rolling device 2 according to one embodiment. Figure 8 The flowchart shown is based on a reversing mill (refer to Figure 1 and Figure 2 ) is the object. In this embodiment, in the Mth rolling, after the edge crack is detected by the edge crack sensor 30 (S502), the rolling condition determination unit 54 determines whether the next rolling (the (M+1)th) pass) can be performed based on the size of the detected edge crack (S504).

[0088] In step S504, for example, if the size of the edge crack is larger than a predetermined value, it is determined that the next rolling pass cannot be performed (No in S504), and the rolling of the metal plate S is stopped (S505). On the other hand, in step S504, for example, if the size of the edge crack is less than a predetermined value, it is determined that the next rolling pass can be performed (Yes in S504).

[0089] Next, the rolling condition determination unit 54 determines whether it is necessary to change the rolling schedule (pass schedule) (i.e., change the target plate thickness) in the next rolling pass (the (M+1)th pass) (S506). In step S506, the above-mentioned determination can be made based on the size of the edge crack detected in step S502. For example, when the size of the edge crack is larger than the specified value, it can be determined that the target plate thickness needs to be set larger than the initial predetermined value. Alternatively, in step S506, it can also be determined whether it is necessary to change the rolling schedule based on the stress associated with the edge crack or the shape of the edge crack. When it is determined in step S506 that it is necessary to change the rolling schedule (yes in S506), the rolling schedule is changed (i.e., the target plate thickness of the rolling device 2 is changed; step S508).

[0090] Next, the rolling device 2 tracks the position of the edge crack while rolling the metal plate S in the next pass (the (M+1)th pass) (S510). In step S510, the position of the edge crack in the length direction of the metal plate S is calculated, for example, based on the detection result of the edge crack sensor 30 in step S502. Moreover, the rolling conditions may be changed before and after the time point when the edge crack starts from the unwinder 4 based on the position of the edge crack calculated in this way. For example, compared with the period from the first time point when the rolling of the (M+1)th pass is started to the second time point when the edge crack starts from the unwinder 4, the tension at the end of the metal plate S may be reduced or the travel speed of the metal plate S may be reduced during the period from the second time point to the third time point when the edge crack is wound by the winder.

[0091] Thus, when the rolling device 2 is a reversing mill, by determining the rolling conditions after the next pass based on the detection result of the edge crack sensor 30 during rolling, the expansion of edge cracks and plate breakage during the next pass and after rolling can be effectively suppressed.

[0092] Hereinafter, a rolling equipment control device, a rolling equipment, and an operating method of a rolling equipment according to several embodiments will be described in outline.

[0093] (1) A rolling equipment control device according to at least one embodiment of the present invention is a rolling equipment control device having at least one rolling stand for rolling a metal plate, wherein:

[0094] The control device of the rolling device comprises:

[0095] a detection signal acquisition unit for receiving a detection signal of an edge crack at an end portion in a plate width direction of the metal plate from an edge crack sensor; and

[0096] a rolling condition determination unit for determining the rolling conditions of the rolling device,

[0097] The rolling condition determination unit is configured to change the rolling condition of the rolling device from a first rolling condition before the edge crack is detected to a second rolling condition that can suppress the expansion of the edge crack compared to the first rolling condition when the detection signal of the edge crack is received by the detection signal acquisition unit.

[0098] According to the structure of (1) above, when edge cracks are detected at the ends of the metal plate in the plate width direction, the rolling conditions of the rolling device are changed to rolling conditions (second rolling conditions) that can suppress the expansion of the edge cracks during rolling and the plate breakage caused by the expansion of the edge cracks.

[0099] (2) In some embodiments, based on the structure of (1) above,

[0100] The rolling condition determination unit is configured to maintain the rolling condition of the rolling device at the second rolling condition after the detection signal acquisition unit receives the detection signal of the edge crack, at least until the portion of the metal plate containing the edge crack is wound by the winding machine of the rolling device.

[0101] According to the structure of (2) above, after the edge crack is detected, the operation under the second rolling condition is maintained until the portion of the metal plate containing the edge crack (hereinafter referred to as the edge crack portion) is wound by the coiler. Therefore, it is possible to effectively suppress the detected edge crack from expanding during rolling.

[0102] (3) In some embodiments, based on the structure of (2) above,

[0103] The rolling condition determination unit is configured to restore the rolling condition in the rolling device to the first rolling condition after the portion of the metal plate including the edge crack is wound by the coiler.

[0104] According to the above-mentioned structure (3), after the edge crack portion is wound by the coiler, the rolling conditions are restored from the second rolling conditions to the first rolling conditions, thereby suppressing the reduction in production efficiency and suppressing the expansion of edge cracks during rolling.

[0105] (4) In some embodiments, based on the structure of any one of (1) to (3),

[0106] The rolling condition determination unit is configured to make the advancing speed of the metal plate lower than the advancing speed of the metal plate under the first rolling condition when the rolling device is operating under the second rolling condition.

[0107] According to the above-mentioned structure (4), during the operation of the rolling device under the second rolling condition, the travel speed of the metal plate is reduced compared to the operation under the first rolling condition. Therefore, even if plate breakage caused by edge cracks occurs during rolling, damage to surrounding equipment, etc. can be reduced.

[0108] (5) In some embodiments, based on the structure of any one of (1) to (3),

[0109] The rolling condition determination unit is configured to make the tension at the end portions in the sheet width direction of the metal sheet smaller than the tension under the first rolling condition when the rolling device is operated under the second rolling condition.

[0110] According to the above-mentioned structure (5), when the rolling device is operated under the second rolling condition, the tension at the ends in the width direction of the metal plate is reduced compared to the operation under the first rolling condition, thereby suppressing the expansion of edge cracks during rolling.

[0111] (6) In some embodiments, based on the structure of any one of (1) to (5),

[0112] The at least one rolling stand includes an upstream stand provided at a position upstream of a detection position of the edge crack in a traveling direction of the metal plate.

[0113] When the size of the edge crack generated in the metal plate is small, it is sometimes difficult to detect the edge crack with the detector. In this regard, according to the above-mentioned structure (6), since the edge crack that has been enlarged to some extent by passing through the upstream side frame is detected, the edge crack can be detected more reliably.

[0114] (7) In some embodiments, based on the structure of (6) above,

[0115] The at least one rolling stand includes a downstream stand, the downstream stand being disposed at a position downstream of the detection position of the edge crack in the traveling direction,

[0116] The rolling condition determination unit is configured such that, during the operation of the rolling device under the second rolling condition,

[0117] until the edge crack passes through the downstream stand, the tension at the end portion in the plate width direction of the metal plate in the region between the upstream stand and the downstream stand is made smaller than the tension under the first rolling condition,

[0118] After the edge crack passes through the downstream stand, the tension in the region is restored to the tension under the first rolling condition.

[0119] According to the configuration of (7) above, after edge cracks are detected, the tension at the end portion in the plate width direction in the region between the upstream side stand and the downstream side stand is made smaller than the tension under the first rolling condition until the edge crack portion passes through the downstream side stand, thereby suppressing the expansion of the edge crack during rolling. In addition, after the edge crack portion passes through the downstream side stand, the tension at the end portion in the plate width direction in the region between the upstream side stand and the downstream side stand is restored to the tension under the first rolling condition, thereby suppressing the reduction in production efficiency and suppressing the expansion of the edge crack during rolling.

[0120] (8) In some embodiments, based on the structure of any one of (1) to (7),

[0121] The rolling device is configured to perform a plurality of passes of rolling of the metal plate.

[0122] The rolling condition determination unit is configured to determine rolling conditions of the metal plate for a next pass and subsequent passes by the rolling device based on a detection result received from the edge crack sensor during rolling by the rolling device.

[0123] According to the structure of (8) above, in a rolling device configured to perform multiple passes of rolling of metal plates, the rolling conditions after the next pass are determined based on the detection results of the edge crack sensor during rolling, thereby suppressing the expansion of edge cracks and plate breakage during the next pass and after rolling.

[0124] (9) In some embodiments, based on the structure of (8),

[0125] The rolling condition determination unit is configured to determine whether to perform a next pass of rolling of the metal plate by the rolling device based on a size of the edge crack of the metal plate detected by the edge crack sensor.

[0126] According to the configuration of (9) above, whether or not to perform the next rolling pass is determined based on the size of the detected edge crack, thereby effectively suppressing the expansion of the edge crack and the plate breakage in the next and subsequent rolling passes.

[0127] (10) In some embodiments, based on the structure of (8) above,

[0128] The rolling condition determination unit is configured to determine the timing of changing the rolling conditions of the metal plate in the next rolling pass of the rolling device based on the position of the edge crack of the metal plate detected by the edge crack sensor in the longitudinal direction of the metal plate.

[0129] According to the above-mentioned structure (10), since the timing of changing the rolling conditions in the next rolling pass is determined based on the position of the detected edge crack in the length direction of the metal plate, the reduction in production efficiency can be suppressed and the expansion of the edge crack during rolling can be suppressed.

[0130] (11) A rolling facility according to at least one embodiment of the present invention comprises:

[0131] a rolling device comprising at least one rolling stand for rolling metal plates;

[0132] an edge crack sensor configured to detect an edge crack at an end portion in a plate width direction of the metal plate during rolling by the rolling device; and

[0133] The control device described in any one of (1) to (10) above is configured to control the rolling device based on the detection signal from the edge crack sensor.

[0134] According to the above-mentioned structure (11), when edge cracks at the ends of the metal plate in the plate width direction are detected, the rolling conditions of the rolling device are changed to rolling conditions (second rolling conditions) that can suppress the expansion of the edge cracks during rolling and the plate breakage caused by the expansion of the edge cracks.

[0135] (12) In some embodiments, based on the structure of (11) above,

[0136] The edge crack sensor comprises:

[0137] a radiation generating unit configured to generate radiation toward an end portion of the metal plate; and

[0138] The radiation detection section is provided on the opposite side to the radiation generation section via the metal plate, and is configured to receive the radiation from the radiation generation section.

[0139] The vicinity of the rolling rolls of a rolling stand is often a harsh environment where rolling oil and smoke are scattered in large quantities, the rolling rolls vibrate, and it is dark. In this regard, according to the structure of (12) above, an edge crack sensor including a radiation generating unit and a radiation detecting unit and detecting edge cracks using radiation is used, so that edge cracks can be detected near the rolling rolls in a harsh environment.

[0140] (13) A method for operating a rolling mill according to at least one embodiment of the present invention is a method for operating a rolling mill including at least one rolling stand, wherein:

[0141] The operation method of the rolling device comprises the following steps:

[0142] Rolling the metal plate using the rolling device;

[0143] detecting edge cracks at the end portions of the metal plate in the plate width direction during rolling by the rolling device; and

[0144] When an edge crack of the metal plate is detected, the rolling condition of the rolling device is changed from a first rolling condition before the edge crack is detected to a second rolling condition capable of suppressing the expansion of the edge crack compared to the first rolling condition.

[0145] According to the above-mentioned method (13), when edge cracks at the ends of the metal plate in the plate width direction are detected, the rolling conditions of the rolling device are changed to rolling conditions (second rolling conditions) that can suppress the expansion of the edge cracks during rolling and the plate breakage caused by the expansion of the edge cracks.

[0146] As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment, and also includes the form which added the deformation|transformation of the said embodiment, and the form which combined these forms suitably.

[0147] In this specification, expressions such as "in a certain direction", "along a certain direction", "parallel", "orthogonal", "center", "concentric" or "coaxial" that indicate relative or absolute configurations not only indicate such configurations in a strict sense, but also indicate a state of relative displacement at an angle or distance with a tolerance or a degree that can achieve the same function.

[0148] For example, expressions such as “same”, “equal”, and “homogeneous” indicating a state in which things are equal not only indicate a state of being strictly equal but also indicate a state in which there is a tolerance or a difference to the extent that the same function can be obtained.

[0149] In the present specification, expressions such as a quadrilateral and a cylindrical shape indicate not only shapes such as a quadrilateral and a cylindrical shape in a strict geometric sense, but also shapes including concave-convex portions, chamfered portions, etc. within a range that can obtain the same effect.

[0150] In addition, in this specification, the expression “having”, “including” or “having” a component is not an exclusive expression that excludes the existence of other components.

[0151] Description of reference numerals:

[0152] 1 Rolling equipment

[0153] 2 Rolling device

[0154] 4 Unwinding machine

[0155] 6 Input side pinch roller

[0156] 7 Upstream side rack

[0157] 9 Downstream side rack

[0158] 10 Rolling stand

[0159] 10A rolling stand

[0160] 10B rolling stand

[0161] 10C rolling stand

[0162] I0D rolling stand

[0163] 11 Motor

[0164] 12 Output side pinch roller

[0165] 14 Winding Machine

[0166] 15 Rolling Roll

[0167] 16 Roller

[0168] 17 Middle Roller

[0169] 18 Middle Roller

[0170] 19 Support roller

[0171] 20 Support roller

[0172] 22 Pressing device

[0173] 23 Roller Bending Machine

[0174] 24 Heater

[0175] 26 Shift cylinder

[0176] 30 Edge Crack Sensor

[0177] 32 Radiation generating unit

[0178] 34 Radiation Detection Department

[0179] 50 Control device

[0180] 52 Detection signal acquisition unit

[0181] 54 Rolling condition determination department

[0182] 56 Control Department

[0183] E Board end

[0184] S Metal sheet.

Claims

1. A control device for a rolling device, the rolling device having at least one rolling stand for rolling a metal plate, wherein: The control device of the rolling device comprises: a detection signal acquisition unit for receiving a detection signal of an edge crack at an end portion in a plate width direction of the metal plate from an edge crack sensor; and a rolling condition determination unit for determining the rolling conditions of the rolling device, The rolling condition determination unit is configured to change the rolling condition of the rolling device from a first rolling condition before the edge crack is detected to a second rolling condition that can suppress the expansion of the edge crack compared with the first rolling condition when the detection signal acquisition unit receives the detection signal of the edge crack. The rolling condition determination unit is configured to maintain the rolling condition of the rolling device at the second rolling condition at least until the portion of the metal plate including the edge crack is wound by the winding machine of the rolling device after the detection signal acquisition unit receives the detection signal of the edge crack. The rolling condition determination unit is configured to restore the rolling condition in the rolling device to the first rolling condition after the portion of the metal plate including the edge crack is wound by the coiler.

2. The control device for a rolling device according to claim 1, wherein: The rolling condition determination unit is configured to make the advancing speed of the metal plate lower than the advancing speed of the metal plate under the first rolling condition when the rolling device is operating under the second rolling condition.

3. The control device for a rolling device according to claim 1 or 2, wherein: The rolling condition determination unit is configured to make the tension at the end portions in the sheet width direction of the metal sheet smaller than the tension under the first rolling condition when the rolling device is operated under the second rolling condition.

4. The control device for a rolling device according to claim 1 or 2, wherein: The at least one rolling stand includes an upstream stand provided at a position upstream of a detection position of the edge crack in a traveling direction of the metal plate.

5. A control device for a rolling device, the rolling device having at least one rolling stand for rolling a metal plate, wherein: The control device of the rolling device comprises: a detection signal acquisition unit for receiving a detection signal of an edge crack at an end portion in a plate width direction of the metal plate from an edge crack sensor; and a rolling condition determination unit for determining the rolling conditions of the rolling device, The rolling condition determination unit is configured to change the rolling condition of the rolling device from a first rolling condition before the edge crack is detected to a second rolling condition that can suppress the expansion of the edge crack compared with the first rolling condition when the detection signal acquisition unit receives the detection signal of the edge crack. The at least one rolling stand includes an upstream stand, the upstream stand being arranged at a position upstream of a detection position of the edge crack in a traveling direction of the metal plate, The at least one rolling stand includes a downstream stand, the downstream stand being disposed at a position downstream of the detection position of the edge crack in the traveling direction, The rolling condition determination unit is configured such that, during the operation of the rolling device under the second rolling condition, until the edge crack passes through the downstream stand, the tension at the end portion in the plate width direction of the metal plate in the region between the upstream stand and the downstream stand is made smaller than the tension under the first rolling condition, After the edge crack passes through the downstream stand, the tension in the region is restored to the tension under the first rolling condition.

6. The control device for a rolling device according to claim 1 or 5, wherein: The rolling device is configured to perform a plurality of passes of rolling of the metal plate. The rolling condition determination unit is configured to determine rolling conditions of the metal plate for a next pass and subsequent passes by the rolling device based on a detection result received from the edge crack sensor during rolling by the rolling device.

7. The control device for a rolling device according to claim 6, wherein: The rolling condition determination unit is configured to determine whether to perform a next pass of rolling of the metal plate by the rolling device based on a size of the edge crack of the metal plate detected by the edge crack sensor.

8. The control device for a rolling device according to claim 6, wherein: The rolling condition determination unit is configured to determine the timing of changing the rolling conditions of the metal plate in the next rolling pass of the rolling device based on the position of the edge crack of the metal plate detected by the edge crack sensor in the longitudinal direction of the metal plate.

9. A rolling equipment comprising: a rolling device comprising at least one rolling stand for rolling metal plates; an edge crack sensor configured to detect an edge crack at an end portion in a plate width direction of the metal plate during rolling by the rolling device; and The control device according to any one of claims 1 to 8 is configured to control the rolling device based on the detection signal from the edge crack sensor.

10. The rolling equipment according to claim 9, wherein: The edge crack sensor comprises: a radiation generating unit configured to generate radiation toward an end portion of the metal plate; and The radiation detection section is provided on the opposite side to the radiation generation section via the metal plate, and is configured to receive the radiation from the radiation generation section.

11. A method for operating a rolling device, the rolling device comprising at least one rolling stand, wherein: The operation method of the rolling device comprises the following steps: Rolling the metal plate using the rolling device; detecting edge cracks at the ends of the metal plate in the plate width direction during rolling by the rolling device; When an edge crack of the metal plate is detected, changing the rolling condition of the rolling device from a first rolling condition before the edge crack is detected to a second rolling condition capable of suppressing the expansion of the edge crack compared with the first rolling condition; After the edge crack is detected, the rolling condition of the rolling device is maintained at the second rolling condition at least until the portion of the metal plate including the edge crack is wound by the winding machine of the rolling device; as well as After the portion of the metal plate including the edge crack is coiled by the coiler, the rolling conditions in the rolling device are restored to the first rolling conditions.

12. A method for operating a rolling device, the rolling device comprising at least one rolling stand, wherein: The operation method of the rolling device comprises the following steps: Rolling the metal plate using the rolling device; detecting edge cracks at the ends of the metal plate in the plate width direction during rolling by the rolling device; as well as When an edge crack of the metal plate is detected, the rolling condition of the rolling device is changed from a first rolling condition before the edge crack is detected to a second rolling condition that can suppress the expansion of the edge crack compared to the first rolling condition, The operation method of the rolling device further comprises the following steps: The at least one rolling stand includes an upstream stand, the upstream stand being arranged at a position upstream of a detection position of the edge crack in a traveling direction of the metal plate, The at least one rolling stand includes a downstream stand, the downstream stand being disposed at a position downstream of the detection position of the edge crack in the traveling direction, During operation of the rolling device under the second rolling condition, until the edge crack passes through the downstream stand, the tension at the end portion in the plate width direction of the metal plate in the region between the upstream stand and the downstream stand is made smaller than the tension under the first rolling condition, After the edge crack passes through the downstream stand, the tension in the region is restored to the tension under the first rolling condition.

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