EP3974074B1 - Steuervorrichtung für eine walzvorrichtung, walzvorrichtung und verfahren zum betrieb einer walzvorrichtung - Google Patents

Steuervorrichtung für eine walzvorrichtung, walzvorrichtung und verfahren zum betrieb einer walzvorrichtung Download PDF

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Publication number
EP3974074B1
EP3974074B1 EP19937138.6A EP19937138A EP3974074B1 EP 3974074 B1 EP3974074 B1 EP 3974074B1 EP 19937138 A EP19937138 A EP 19937138A EP 3974074 B1 EP3974074 B1 EP 3974074B1
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EP
European Patent Office
Prior art keywords
metal plate
plate
rolling
pair
mill
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Active
Application number
EP19937138.6A
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English (en)
French (fr)
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EP3974074C0 (de
EP3974074A1 (de
EP3974074A4 (de
Inventor
Yoichi Matsui
Yuta ODAWARA
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Primetals Technologies Japan Ltd
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Primetals Technologies Japan Ltd
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Publication of EP3974074A1 publication Critical patent/EP3974074A1/de
Publication of EP3974074A4 publication Critical patent/EP3974074A4/de
Application granted granted Critical
Publication of EP3974074C0 publication Critical patent/EP3974074C0/de
Publication of EP3974074B1 publication Critical patent/EP3974074B1/de
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B2015/0057—Coiling the rolled product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2265/00—Forming parameters
    • B21B2265/02—Tension
    • B21B2265/08—Back or outlet tension
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2273/00—Path parameters
    • B21B2273/04—Lateral deviation, meandering, camber of product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2273/00—Path parameters
    • B21B2273/06—Threading
    • B21B2273/10—Threading-out or after threading-out
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2273/00—Path parameters
    • B21B2273/12—End of product
    • B21B2273/14—Front end or leading end
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/48—Tension control; Compression control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/68—Camber or steering control for strip, sheets or plates, e.g. preventing meandering
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product

Definitions

  • the present disclosure relates to a control device for a rolling mill device, a rolling mill facility, and a method for operating a rolling mill device.
  • the metal plate may be rolled in a state where no tension is applied to the metal plate on the exit side of the rolling mill (tip end tension-free rolling).
  • Patent Document 1 describes that, using a rolling mill device that includes a rolling mill (mill rolls) and a tension reel (winding device) disposed on the exit side of the rolling mill, rolling is performed before the tension is established on the exit side of the rolling mill by winding a rolled material (metal plate) with the tension reel.
  • Patent Document 1 describes the installation of a meandering detector upstream of the tension reel on the exit side of the rolling mill, and the tilting control of the rolling mill on the basis of the offset amount (the difference between the axial center position of the mill rolls and the widthwise center position of the rolled material) detected by the meandering detector. This is intended to improve yield by suppressing meandering and one-sided elongation that can occur due to rolling in a state where no exit-side tension is applied.
  • Other examples are known from Patent Documents 2 and 3.
  • a position sensor (meandering detector in Patent Document 1) disposed on the exit side of the mill rolls can be used to detect the position of a predetermined portion (center position or plate end position) of the metal plate in the plate width direction, and the rolling mill can be controlled based on the detected value.
  • the position of the predetermined portion of the metal plate in the plate width direction to be detected deviates from a specified position at the rolling mill (for example, even if the center position of the metal plate in the plate width direction deviates from the center position of the mill rolls in the axial direction)
  • the detected position by the position sensor matches the specified position when the outgoing direction of the metal plate from the mill rolls is oblique to the conveying direction by the rolling mill device for some reason.
  • the inclination of the outgoing direction of the metal plate cannot be properly grasped from the detection result by the position sensor. Therefore, if the rolling is continued in this state, the tip end of the metal plate will be separated from the conveyance line of the rolling mill in the plate width direction, and the rolled metal plate may not be appropriately wound by the winding device.
  • an object of at least one embodiment of the present invention is to provide a control device for a rolling mill device, a rolling mill facility, and a method for operating a rolling mill device whereby it is possible to appropriately wind by a winding device a metal plate rolled with no tension applied to the tip end.
  • At least one embodiment of the present invention provides a control device for a rolling mill device, a rolling mill facility, and a method for operating a rolling mill device whereby it is possible to appropriately wind by a winding device a metal plate rolled with no tension applied to the tip end.
  • FIGs. 1 and 2 are each a schematic configuration diagram of a rolling mill facility equipped with a control device according to an embodiment.
  • the rolling mill facility 1 includes a rolling mill device 2 and a control device 100 for controlling the rolling mill device 2.
  • the rolling mill device 2 may include one rolling mill 10 as shown in FIG. 1 for example, or may include two rolling mills 10 (10A, 10B) as shown in FIG. 2 for example, or may include three or more rolling mills 10.
  • the rolling mill device 2 shown in FIG. 1 is a rolling mill device (reverse mill) that reciprocates and rolls a metal plate 90 passed between a pair of mill rolls 15, 16.
  • the rolling mill device 2 shown in FIG. 1 includes a rolling mill 10 including a pair of mill rolls (work rolls) 15, 16 disposed on opposite sides of a metal plate 90, which is a rolled material, an unwinding device 4 disposed on the entry side of the mill rolls 15, 16 in the traveling direction of the metal plate 90, and a winding device 14 disposed on the exit side of the mill rolls 15, 16 in the traveling direction of the metal plate 90, and is configured to roll the metal plate 90 by the pair of mill rolls 15, 16.
  • the rolling mill device 2 shown in FIG. 2 is a rolling mill device (reverse mill) that reciprocates and rolls a metal plate 90 passed between a pair of first mill rolls 15A, 16A and a pair of second mill rolls 15B, 16B.
  • the rolling mill device 2 shown in FIG. 2 is a rolling mill device (reverse mill) that reciprocates and rolls a metal plate 90 passed between a pair of first mill rolls 15A, 16A and a pair of second mill rolls 15B, 16B.
  • first rolling mill 10A including a pair of first mill rolls (work rolls) 15A, 16A disposed on opposite sides of a metal plate 90, which is a rolled material
  • second rolling mill 10B including a pair of second mill rolls (work rolls) 15B, 16B disposed on opposite sides of the metal plate 90
  • an unwinding device 4 disposed on the entry side of the first mill rolls 15A, 16A in the traveling direction of the metal plate 90
  • a winding device 14 disposed on the exit side of the second mill rolls 15B, 16B in the traveling direction of the metal plate 90, and is configured to roll the metal plate 90 by the pair of first mill rolls 15A, 16A and the pair of second mill rolls 15B, 16B.
  • the illustrated rolling mills 10, 10A, and 10B have a similar configuration.
  • the configuration of the rolling mill 10 will be described, but the same description applies to the rolling mills 10A and 10B.
  • components (mill rolls, etc.) of the rolling mills 10A and 10B are marked with "A" or "B" respectively, with the same sign for components of the rolling mill 10 shown in FIG. 1 .
  • the rolling mill 10 includes, in addition to the pair of mill rolls (work rolls) 15, 16, a pair of intermediate rolls 17, 18 and a pair of backup rolls 19, 20 disposed on the opposite sides of the metal plate 90 to sandwich the pair of mill rolls 15, 16.
  • the intermediate rolls 17, 18 and the backup rolls 19, 20 are configured to support the mill rolls 15, 16.
  • the rolling mill 10 includes a roll reduction device 22 for reducing the thickness of the metal plate 90 sandwiched between the pair of mill rolls 15, 16 by applying a load to the pair of mill rolls 15, 16.
  • the roll reduction device 22 may include a hydraulic cylinder.
  • a motor (not shown) is connected to the mill rolls 15, 16 via, for example, a spindle (not shown), and the mill rolls 5, 16 are rotationally driven by the motor.
  • the mill rolls 15, 16 are rotated by the motor while the metal plate 90 is pressed by the roll reduction device 22, which creates a frictional force between the mill rolls 15, 16 and the metal plate 90 and moves the metal plate 90 to the exit side of the mill rolls 15, 16 by this frictional force.
  • the unwinding device 4 is configured to unwind the metal plate 90 toward the rolling mill 10.
  • the winding device 14 is configured to wind the metal plate 90 from the rolling mill 10.
  • the unwinding device 4 and the winding device 14 are driven by respective motors (not shown).
  • the unwinding device 4 is configured to apply an entry-side tension to the metal plate 90 during the rolling of the metal plate 90.
  • the winding device 14 is configured to apply an exit-side tension to the metal plate 90 during the rolling of the metal plate 90.
  • the motors appropriately drive the unwinding device 4 and the winding device 14 to apply the entry-side tension and exit-side tension to the metal plate 90.
  • the rolling is stopped just before the tail end of the metal plate 90 unwound from the unwinding device 4, and the odd-numbered rolling (e.g., first pass) is completed in a state where the metal plate 90 is pressed by the mill rolls 15, 16.
  • the metal plate 90 is then rewound from the winding device 14 toward the rolling mill 10, and the metal plate 90 travels in a direction opposite to the previous traveling direction and is wound by the unwinding device 4 for the even-numbered rolling (e.g., second pass).
  • the roles of the unwinding device 4 and the winding device 14 are interchangeable depending on the traveling direction of the metal plate 90.
  • the rolling mill device 2 shown in FIGs. 1 and 2 further includes an entry pinch roll 6 and a side guide 8 for guiding the metal plate 90 introduced from the unwinding device 4 to the rolling mill 10, and an exit pinch roll 12 for guiding the metal plate 90 fed from the rolling mill 10 to the winding device 14.
  • the control device 100 for controlling the rolling mill device 2 includes a first plate end detection part 32 and a second plate end detection part 34 for detecting plate end positions in the plate width direction of the metal plate 90, and a controller 40 configured to control the operation of the rolling mill device 2 on the basis of detection results of the first plate end detection part 32 and the second plate end detection part 34.
  • the first plate end detection part 32 is disposed on the entry side of the pair of mill rolls 15, 16 in the conveying direction of the metal plate 90, and is configured to detect a first plate end position x1, which is the plate end position in the plate width direction of the metal plate at a first position Y1 in the conveying direction.
  • the second plate end detection part 34 is disposed on the exit side of the pair of mill rolls 15, 16 in the conveying direction, and is configured to detect a second plate end position x2, which is the plate end position in the plate width direction of the metal plate at a second position Y2 in the conveying direction.
  • the control device100 shown in FIG. 2 is provided with first plate end detection parts 32A, 32B on the entry side in the conveying direction and second plate end detection parts 34A, 34B on the exit side in the conveying direction for each of the first mill rolls 15A, 16A and the second mill rolls 15B, 16B.
  • the controller 40 is configured to receive signals indicating measurement results from the first plate end detection part 32 and the second plate end detection part 34, and to control the operation of the motors for driving the roll reduction device 22 and the mill rolls 15, 16 based on these measurement results.
  • the controller 40 may include a CPU, a memory (RAM), an auxiliary memory, and an interface.
  • the controller 40 is configured to receive signals from the first plate end detection part 32 and the second plate end detection part 34 via the interface.
  • the CPU is configured to process the signals thus received. Further, the CPU is configured to process a program loaded into the memory.
  • the processing contents in the controller 40 may be implemented as a program executed by the CPU and stored in the auxiliary memory.
  • the program is loaded into the memory.
  • the CPU reads the program from the memory and executes instructions contained in the program.
  • FIG. 3 is a schematic configuration diagram of the controller 40 constituting the control device 100 according to an embodiment.
  • the controller 40 includes a determination part 42 and a rolling control part 44.
  • the determination part 42 is configured to determine whether the rolling of the metal plate 90 by the pair of mill rolls 15, 16 in a state where the exit-side tension applied to the metal plate 90 is zero (tip end tension-free rolling) can be started, on the basis of the first plate end position x1 of the metal plate 90 detected by the first plate end detection part 32 and the second plate end position x2 of the metal plate 90 detected by the second plate end detection part 34.
  • the rolling control part 44 is configured to control the operation of the pair of mill rolls 15, 16. More specifically, the rolling control part 44 is configured to control the motors for driving the roll reduction device 22 and the mill rolls 15, 16 in order to adjust the gap between the rolls and the rotation speed of the mill rolls 15, 16.
  • the control device 100 may further have a display part (e.g., display; not shown) for displaying the determination result of the determination part 42.
  • a display part e.g., display; not shown
  • the rolling mill device 2 may be operated by manually performing some or all of the processing by the control device 100 described below.
  • FIG. 4 is a flowchart showing an example of the method for operating the rolling mill device 2 according to an embodiment.
  • FIG. 4 is a flowchart showing an example of the operating method up to the start of tip end tension-free rolling of the metal plate 90. The operating method after the start of tip end tension-free rolling of the metal plate 90 will be described later with reference to the flowcharts of FIGs. 11 and 14 .
  • FIGs. 5A to 5C are each a schematic diagram showing the state of the metal plate 90 and the mill rolls 15, 16 at the time of start of the tip end tension-free rolling of the metal plate 90.
  • FIGs. 6 and 7 are each a diagram for describing determination by the determination part 42 whether the tip end tension-free rolling can be started.
  • the controller 40 adjusts the positions of the pair of mill rolls 15, 16 so that the gap (roll-to-roll gap) between the pair of mill rolls 15, 16 is larger than the thickness of the metal plate 90 (step S102).
  • the position of the pair of mill rolls 15, 16 may be adjusted by operating the roll reduction device 22 as needed.
  • the tip end portion of the metal plate 90 including a tip end 91 is passed between the pair of mill rolls 15, 16 (step S104).
  • FIG. 5A is a schematic diagram showing the state of the metal plate 90 and the mill rolls 15, 16 when step S 104 is completed.
  • the tip end portion of the metal plate 90 including the tip end 91 has passed between the mill rolls 15, 16 while the gap d0 between the pair of mill rolls 15, 16 is larger than the thickness H0 of the metal plate 90 before rolling.
  • the tip end portion of the metal plate 90 including the tip end 91 is located on the exit side of the mill rolls 15, 16 and has not reached the winding device 14. Therefore, the exit-side tension Td acting on the metal plate 90 is zero. Further, at this point, the entry-side tension Te is also zero because it is not acting on the metal plate 90.
  • the first plate end detection part 32 is used to detect the first plate end position x1 at the first position Y1 in the conveying direction
  • the second plate end detection part 34 is used to detect the second plate end position x2 at the second position Y2 in the conveying direction (step S106).
  • FIGs. 6 and 7 are each a schematic diagram of the mill rolls 15, 16 and the metal plate 90 in plan view before the rolling is started.
  • the metal plate 90 has a plate width W, and has a first edge 92 and a second edge 93, which are opposite edges in the plate width direction.
  • the first plate end detection part 32 and the second plate end detection part 34 may be configured to detect the position of the first edge 92 at the first position Y1 and the second position Y2 as the first plate end position x1 and the second plate end position x2, respectively (see FIGs. 6 and 7 ).
  • the first plate end detection part 32 and the second plate end detection part 34 may be configured to detect the position of the second edge 93 at the first position Y1 and the second position Y2 as the first plate end position x1 and the second plate end position x2, respectively.
  • step S106 the determination part 42 determines whether the tip end tension-free rolling of the metal plate 90 can be started, on the basis of the first plate end position x1 and the second plate end position x2 detected in step S106 (step S108).
  • step S108 for example, if the longitudinal direction of the metal plate 90 is substantially parallel to the conveying direction of the metal plate 90 in the rolling mill device 2 (see FIG. 6 ), it is determined that the tip end tension-free rolling of the metal plate 90 can be started, and if the inclination of the longitudinal direction of the metal plate 90 with respect to the conveying direction of the metal plate 90 is greater than a specified degree (see FIG. 7 ), it is determined that the tip end tension-free rolling of the metal plate 90 cannot be started.
  • step S108 if the difference
  • step S108 if the difference (x1-x ref ) between the first plate end position x1 and a reference position x ref in the plate width direction of the metal plate 90 and the difference (x2-x ref ) between the second plate end position x2 and the reference position x ref are both equal to or less than a threshold x th2 , it is determined that the tip end tension-free rolling of the metal plate 90 can be started, and if at least one of the difference (x1-x ref ) or (x2-x ref ) is greater than the threshold x th2 , it is determined that the tip end tension-free rolling of the metal plate 90 cannot be started.
  • the reference position x ref is a predetermined position in the plate width direction (i.e., in the axial direction (direction of the center axis O) of the mill rolls 15, 16) when the longitudinal direction of the metal plate 90 coincides with the conveying direction by the mill rolls 15, 16 (rolling mill).
  • the reference position x ref may be, for example, the center position in the axial direction of the mill rolls 15, 16 (see FIGs. 6 and 7 ).
  • the longitudinal direction of the metal plate 90 coincides with the conveying direction by the mill rolls, and at this time, the position of the center line Lc along the longitudinal direction of the metal plate 90 coincides with the reference position x ref in the plate width direction (i.e., the axial direction of the mill rolls 15, 16).
  • step S108 If it is determined in the step S108 that the tip end tension-free rolling of the metal plate 90 cannot be started (No in step S 108), the position of the metal plate 90 in the plate width direction is corrected (step S110), and the process returns to step S106 to detect the first plate end position x1 and the second plate end position x2 (step S106 ) and it is determined whether the tip end tension-free rolling of the metal plate 90 can be started based on the detection results in step S106 (step S108).
  • step S108 if it is determined in the step S108 that the tip end tension-free rolling of the metal plate 90 can be started (Yes in step S108), the rolling control part 44 starts the tip end tension-free rolling of the metal plate 90.
  • step S 112 in a state where the exit-side tension Td applied to the metal plate 90 is zero, the metal plate 90 is pressed by the pair of mill rolls 15, 16, and the rotation of the pair of mill rolls 15, 16 is started to start the tip end tension-free rolling of the metal plate 90 (see FIG. 5B ).
  • the roll reduction device 22 When the metal plate 90 is pressed by the pair of mill rolls 15, 16, as shown in FIG. 5B , the roll reduction device 22 is operated so that the gap between the rolls is set to a value d1 corresponding to a target thickness.
  • the gap d1 between the rolls at this time is smaller than the thickness H0 of the metal plate 90 before rolling.
  • the rotation speed of the mill rolls 15, 16 is adjusted to an appropriate value by adjusting the current value of the motor used to drive the mill rolls 15, 16.
  • the metal plate 90 travels in the direction of the arrow shown in FIG. 5B . Then, as shown in FIG. 5C , after the start of rolling, the portion of the metal plate 90 that has been pressed by the mill rolls 15, 16 and has advanced to the exit side of the mill rolls 15, 16 has a thickness H1 that is thinner than the thickness H0 before rolling.
  • the tip end tension-free rolling of the metal plate 90 allows the rolling to start from a portion close to the tip end of the metal plate 90, compared to the case where the rolling is started in a state where the tip end of the metal plate is wound around the winding device and the exit-side tension is applied, so that the yield of the metal plate 90 can be improved.
  • step S108 after it is determined in step S108 that the tip end tension-free rolling of the metal plate 90 can be started, the tip end tension-free rolling is started in step S112, so that the metal plate 90 rolled with no tension applied to the tip end can be appropriately wound by the winding device 14.
  • a plate end position detection part is installed only at one position on the exit side of the mill roll 15, 16, the following problems may occur. Specifically, as shown in FIG. 7 for example, even if the longitudinal direction of the metal plate 90 is oblique to the conveying direction of the metal plate 90 by the mill rolls 15, 16 (rolling mill 10) before the start of rolling, it is unclear whether the longitudinal direction of the metal plate 90 is oblique to the conveying direction from the detection result of the plate end position at only one point in the conveying direction. When the tip end tension-free rolling is started in this case, the outgoing direction of the metal plate 90 from the mill rolls 15, 16 remains oblique to the conveying direction by the rolling mill 10.
  • the plate end position (e.g., second plate end position x2 in FIG. 7 ) detected by the plate end position detection part disposed on the exit side is almost fixed even after the rolling is started. Therefore, even if the control is based on the detected plate end position, the inclination of the metal plate 90 with respect to the conveying direction cannot be corrected, and if the rolling is continued in this state, the tip end of the metal plate 90 will be separated from the conveyance line of the rolling mill 10 in the plate width direction, and the rolled metal plate 90 may not be appropriately wound by the winding device 14.
  • step S106 the plate end positions (first plate end position x1 and second plate end position x2) in the plate width direction of the metal plate 90 are detected at the first position Y1 on the entry side and the second position Y2 on the exit side of the pair of mill rolls 15, 16. Accordingly, on the basis of these detection results, it is possible to ascertain the degree of inclination of the longitudinal direction of the metal plate 90 with respect to the conveying direction before the tip end tension-free rolling is started, that is, it is possible to ascertain the degree of inclination of the outgoing direction of the metal plate 90 with respect to the conveying direction at the start of tip end tension-free rolling.
  • step S108 it is determined whether the tip end tension-free rolling can be started based on the detection results of the first plate end position x1 and the second plate end position x2.
  • the longitudinal direction of the metal plate 90 i.e., the outgoing direction of the metal plate 90 at the start of rolling
  • the tip end tension-free rolling can be started in a state where the outgoing direction of the metal plate 90 is almost parallel to the conveying direction, so that the tip end portion of the metal plate 90 can be prevented from deviating from the conveyance line by the rolling mill 10 in the plate width direction.
  • the winding device 14 it is easy to appropriately wind the rolled metal plate 90 by the winding device 14.
  • the tip end tension-free rolling can be started in a state where the outgoing direction of the metal plate 90 is almost parallel to the conveying direction, by using the second plate end position x2 obtained at the start of tip end tension-free rolling as a reference, the roll tilting control of the rolling mill 10, such as meandering control of the metal plate 90, can be appropriately performed based on the second plate end position detected during the tip end tension-free rolling.
  • the metal plate 90 rolled with no tension applied to the tip end can be wound by the winding device 14 appropriately.
  • the control device 100 is configured to determine whether the first tip end tension-free rolling of the metal plate 90 by the pair of first mill rolls 15A, 16A (first rolling mill 10A) can be started, and if it is determined that the first tip end tension-free rolling can be started, after the tip end tension-free rolling is started by the pair of first mill rolls 15A, 16A, determine whether the second tip end tension-free rolling of the metal plate 90 by the pair of second mill rolls 15B, 16B can be started.
  • step S108 it is determined whether the tip end tension-free rolling can be started in step S108, and on the basis of the determination result, the tip end tension-free rolling is started in step S112.
  • This enables more efficient rolling using the pair of mill rolls 15A, 16A and the pair of mill rolls 15B, 16B, while enabling the winding device to appropriately wind the metal plate 90 rolled by the mill rolls 15, 16 with no tension applied to the tip end.
  • the first plate end detection part 32 and the second plate end detection part 34 are preferably disposed as close as possible to the mill rolls 15, 16 in the conveying direction of the metal plate 90 by the mill rolls 15, 16.
  • the first plate end position x1 and the second plate end position x2 can be detected by the first plate end detection part 32 and the second plate end detection part 34 in a state where the tip end portion of the metal plate 90 is placed close to the mill rolls 15, 16, and on the basis of the detection results, the rolling can be started in a state where the tip end 91 of the metal plate 90 is placed close to the mill rolls 15, 16, so that the yield of the metal plate 90 can be improved.
  • a distance between the pair of mill rolls 15, 16 and the winding device 14 in the conveying direction is defined as L2 (see FIGs. 1 and 2 )
  • a distance Lb (see FIGs. 1 and 2 ) between the pair of mill rolls 15, 16 and the second plate end detection part 34 in the conveying direction is 0.1 ⁇ L2 or less. In some embodiments, the distance Lb is 0.5 ⁇ L2 or less.
  • the distance in the conveying direction between the pair of mill rolls 15, 16 and the winding device 14 is the distance in the conveying direction between the center axis O of the pair of mill rolls 15, 16 and the center axis of the winding device 14.
  • the distance in the conveying direction between the pair of mill rolls 15, 16 and the second plate end detection part 34 is the distance in the conveying direction between the center axis of the pair of mill rolls 15, 16 and the center position of the second plate end detection part 34 or the plate end detection position (second position Y2) by the second plate end detection part 34.
  • the direction of the center axis O of the mill rolls 15, 16, the direction of the center axis of the unwinding device 4, and the direction of the center axis of the winding device 14 are substantially parallel to each other.
  • the second plate end position x2 can be detected at the start of tension-free rolling and during tension-free rolling while keeping the tip end 91 of the metal plate 90 relatively close to the mill rolls at the start of tension-free rolling. Therefore, the tip end tension-free rolling can be appropriately performed while reducing the length of the tip end portion of the metal plate 90 not to be rolled, so that the yield of the metal plate 90 can be effectively improved.
  • a distance between the pair of mill rolls 15, 16 and the unwinding device 4 in the conveying direction is defined as L1 (see FIGs. 1 and 2 )
  • a distance La (see FIGs. 1 and 2 ) between the pair of mill rolls 15, 16 and the first plate end detection part 32 in the conveying direction is 0.1 ⁇ L1 or less.
  • the distance La is 0.5 ⁇ L1 or less.
  • the distance in the conveying direction between the pair of mill rolls 15, 16 and the unwinding device 4 is the distance in the conveying direction between the center axis O of the pair of mill rolls 15, 16 and the center axis of the unwinding device 4.
  • the distance in the conveying direction between the pair of mill rolls 15, 16 and the first plate end detection part 32 is the distance in the conveying direction between the center axis of the pair of mill rolls 15, 16 and the center position of the first plate end detection part 32 or the plate end detection position (first position Y1) by the first plate end detection part 32.
  • the rolling mill device reverse mill
  • the conveying direction of the metal plate 90 is reversed, and the rolling with the mill rolls 15, 16 starts from the rear end side of the metal plate 90.
  • the first plate end position x1 can be detected at the start of tension-free rolling and during tension-free rolling while keeping the rear end of the metal plate 90 relatively close to the mill rolls at the start of tension-free rolling in the second pass. Therefore, the tip end tension-free rolling can be appropriately performed while reducing the length of the rear end portion of the metal plate 90 not to be rolled, so that the yield of the metal plate 90 can be effectively improved.
  • the rolling mill facility 1 is equipped with a plate thickness gauge disposed on at least one of the entry side or exit side of the pair of mill rolls 15, 16 in the conveying direction and configured to measure the thickness of the metal plate 90.
  • the first plate end detection part 32 or the second plate end detection part 34 is disposed between the pair of mill rolls 15, 16 and the plate thickness gauge in the conveying direction.
  • the first plate end detection part 32 or the second plate end detection part 34 may be disposed at the same position as the plate thickness gauge in the conveying direction. In this case, the first plate end detection part 32 or the second plate end detection part 34 may be provided integrally with the plate thickness gauge.
  • a plate thickness gauge 36 is disposed on the entry side of the pair of mill rolls 15, 16 in the conveying direction, and the first plate end detection part 32 is disposed between the pair of mill rolls 15, 16 and the plate thickness gauge 36 in the conveying direction.
  • a plate thickness gauge 38 is disposed on the exit side of the pair of mill rolls 15, 16 in the conveying direction, and the second plate end detection part 34 is disposed between the pair of mill rolls 15, 16 and the plate thickness gauge 38 in the conveying direction.
  • the plate thickness gauges 36, 38 used to control the thickness of the metal plate 90 are preferably disposed near the mill rolls 15, 16 in the conveying direction to ensure good control response.
  • the first plate end detection part 32 or the second plate end detection part 34 is disposed at the same position as the plate thickness gauges 36, 38 or at a position closer to the mill rolls 15, 16 than the plate thickness gauges 36, 38 in the conveying direction, the first plate end position x1 or the second plate end position x2 can be detected at the start of tension-free rolling and during tension-free rolling while keeping the tip end of the metal plate 90 relatively close to the mill rolls 15, 16 at the start of tension-free rolling. Therefore, the tip end tension-free rolling can be appropriately performed while reducing the length of the tip end portion of the metal plate not to be rolled, so that the yield of the metal plate can be effectively improved.
  • the first plate end detection part 32 or the second plate end detection part 34 is configured to detect the first plate end position x1 or the second plate end position x2 using radiation (e.g., X-rays or gamma rays).
  • radiation e.g., X-rays or gamma rays.
  • the vicinity of the mill rolls 15, 16 is often a harsh environment, such as a large amount of rolling oil and fumes, vibration of the mill rolls 15 and 16, and darkness.
  • the first plate end detection part 32 or the second plate end detection part 34 is configured to detect the plate end position using radiation, it is possible to detect the plate end position appropriately even if they are disposed in the vicinity of the mill rolls 15, 16 in a harsh environment.
  • FIG. 8 is a schematic partial cross-sectional view of the metal plate 90 rolled by the rolling mill facility 1 according to an embodiment, in a cross-section including the plate width direction and the longitudinal direction of the metal plate 90.
  • the metal plate 90 has a first surface 94 located adjacent to the mill roll 15 in the thickness direction, and a second surface 95 located adjacent to the mill roll 16 in the thickness direction.
  • FIGs. 9 and 10 are each a graph showing an example of a graph representing a relationship between time and gap (roll-to-roll gap) between the pair of mill rolls 15, 16 in a period including the start of rolling of the metal plate 90.
  • the rolling control part 44 of the controller 40 brings the pair of mill rolls 15, 16 into contact with the metal plate 90 in the step S 120 (time t0 in FIG. 9 ).
  • the metal plate 90 is not yet pressed, and the contact position between the mill rolls 15, 16 and the metal plate 90 (the position of the center axis O of the mill rolls 15, 16 in the conveying direction) is at positions 94a, 95a (see FIG. 8 ) downstream of the tip end 91, and the thickness of the plate at the positions 94a, 95a is H0 (initial value).
  • the rolling reduction and the rotation speed of the pair of mill rolls 15, 16 are adjusted so that the gap between the pair of mill rolls 15, 16 gradually decreases to a control value dc corresponding to the target thickness Hc of the metal plate 90 as the metal plate 90 is conveyed until the positions 94b, 95b (see FIG. 8 ) downstream of the positions 94a, 95a are reached (from time t1 to t2 in FIG. 9 ).
  • the gap between the rolls is maintained at the control value dc corresponding to the target thickness Hc so that the thickness of the metal plate 90 passed between the mill rolls 15, 16 becomes the target thickness Hc.
  • the portion including the tip end 91 of the metal plate 90 has a shape shown by the solid line in FIG. 8 .
  • the metal plate 90 includes a tip end portion 90a including the tip end 91 and having the thickness H0, a following portion 90c kept at the target thickness Hc, and a transition portion 90b disposed between the tip end portion 90a and the following portion 90c in the longitudinal direction of the metal plate.
  • the plate thickness gradually decreases from H0 to Hc from the positions 94a, 95a to the positions 94b, 95b.
  • the shape of the metal plate 90 changes abruptly in thickness between the tip end portion 90a (thickness is H0), which is in front of the positions 94a, 95a where rolling starts, and the following portion 90c (thickness is Ht), which is behind the positions 94a, 95a.
  • the pair of mill rolls 15, 16 are brought into contact with the metal plate 90, and then while rotating the pair of mill rolls 15, 16, the rolling reduction and the rotation speed of the pair of mill rolls 15, 16 are adjusted so that the gap between the mill rolls 15, 16 gradually decreases to the control value dc corresponding to the target thickness Hc of the metal plate 90 as the metal plate 90 is conveyed.
  • the transition portion 90b (see FIG. 8 ) where the thickness gradually decreases is formed between the tip end portion 90a, which has the same thickness H0 as before rolling, and the following portion 90c, which is rolled to the target thickness Hc.
  • the rolling reduction and the rotation speed of the pair of mill rolls 15, 16 are adjusted so that the inclination angle ⁇ 1 of the first surface 94 at the transition portion 90b with respect to the longitudinal direction of the metal plate 90 or the inclination angle ⁇ 2 of the second surface 95 at the transition portion 90b with respect to the longitudinal direction of the metal plate 90 is 20 degrees or less.
  • the control device 100 includes a detection part configured to detect a plate end position x B in the plate width direction of the metal plate 90 at a position on the exit side of the pair of mill rolls 15, 16 while rolling the metal plate 90 by the pair of mill rolls 15, 16 in a state where the exit-side tension applied to the metal plate 90 is zero (i.e., while performing the tip end tension-free rolling of the metal plate 90).
  • the second plate end detection part 34 disposed on the exit side of the pair of mill rolls 15, 16 functions as this detection part.
  • the controller 40 (see FIG. 3 ) of the control device 100 includes a first tilting part 46 and a second tilting part 48.
  • the first tilting part 46 is configured to perform, when the detection result of the plate end position by the second plate end detection part 34 as the detection part (hereinafter, also simply referred to as "plate end detection part 34") is deviated from a reference position to one side (one of the first edge 92 side or the second edge 93 side; see FIG. 12A , etc.) in the plate width direction, a roll tilting control of the pair of mill rolls 15, 16 so that the outgoing direction of the metal plate 90 from the mill rolls 15, 16 is along the conveying direction of the metal plate 90 in the rolling mill device 2.
  • the second tilting part 48 is configured to perform a roll tilting control of the pair of mill rolls 15, 16 after the roll tilting control by the first tilting part 46 so that the outgoing direction of the metal plate 90 from the mill rolls 15, 16 is displaced to the other side (the other of the first edge 92 side or the second edge 93 side; see FIG. 12A , etc.) in the plate width direction with respect to the conveying direction, and then the outgoing direction of the metal plate 90 returns to the conveying direction.
  • the second plate end detection part 34 detects the plate end position x B in the plate width direction of the metal plate 90 at the position on the exit side of the mill rolls 15, 16. This allows to detect the displacement of the outgoing direction of the metal plate 90 to one side in the plate width direction (tip end bending of the metal plate 90) based on the fact that the detected plate end position x B has deviated from the reference position to one side in the plate width direction.
  • the first tilting part 46 performs the roll tilting control to make the outgoing direction of the metal plate 90 parallel to the conveying direction of the metal plate 90 in the rolling mill device 2
  • the second tilting part 48 performs the roll tilting control to displace the outgoing direction of the metal plate 90 to the other side in the plate width direction with respect to the conveying direction and then make the outgoing direction of the metal plate 90 parallel to the conveying direction.
  • the controller 40 may include at least one of an elongation difference calculation part 50, a displacement angle calculation part 52, or a remaining time calculation part 54.
  • the elongation difference calculation part 50 is configured to calculate a relative first elongation difference d1 on the other side relative to the one side of the metal plate 90 from the time the plate end position x B detected by the second plate end detection part 34 moves away from the reference position to the one side until the plate end position x B returns to the reference position by the roll tilting control by the first tilting part 46.
  • the displacement angle calculation part 52 is configured to acquire a first displacement angle ⁇ 1 of the outgoing direction of the metal plate 90 to the one side with respect to the conveying direction at the time of start of the roll tilting control by the first tilting part 46, and determine a second displacement angle ⁇ 2 of the outgoing direction of the metal plate 90 to the other side with respect to the conveying direction during execution of the roll tilting control by the second tilting part.
  • the remaining time calculation part 54 is configured to calculate a remaining time Tc until the tip end 91 of the metal plate 90 reaches the winding device 14 disposed downstream of the pair of mill rolls 15, 16.
  • the method for operating the rolling mill device 2 by the control device 100 will now be described with reference to FIGs. 1 to 3 and 11 to 15 .
  • the rolling mill device 2 may be operated by manually performing some or all of the processing by the control device 100 described below.
  • FIGs. 11 and 14 are each a flowchart showing an example of the method for operating the rolling mill device 2 according to an embodiment.
  • FIG. 12A to 12D are each a diagram showing a state transition of the metal plate 90 when the rolling mill device 2 is operated according to the flowchart shown in FIG. 11 .
  • FIG. 13 is a graph for describing an example of a method of calculating a first elongation difference and a second elongation difference of the metal plate 90. In this graph, the horizontal axis represents time, and the vertical axis represents displacement amount ⁇ e described later.
  • FIGs. 15A to 15D are a diagram showing a state transition of the metal plate 90 when the rolling mill device 2 is operated according to the flowchart shown in FIG. 14 .
  • the plate end position x B in the plate width direction of the metal plate 90 at the position ("plate end detection position" shown in FIGs. 12A to 12D ) on the exit side of the pair of mill rolls 15, 16 is detected using the second plate end detection part 34 while rolling the metal plate 90 by the pair of mill rolls 15, 16 in a state where the exit-side tension applied to the metal plate 90 is zero (i.e., while performing the tip end tension-free rolling of the metal plate 90) (step S202; detection step).
  • the time t20 is the point when the tip end tension-free rolling of the metal plate 90 is started.
  • step S204 the displacement amount ⁇ e of the plate end position x B detected in step S202 from the reference position in the plate width direction to one side in the plate width direction (one of the first edge 92 side or the second edge 93 side) is calculated (step S204), and the calculated displacement amount ⁇ e is compared with a threshold ⁇ e_th (step S206).
  • the reference position is a specific position in the plate width direction when the longitudinal direction of the metal plate 90 is parallel to the conveying direction by the rolling mill device 2 (the direction perpendicular to the center axis of the mill rolls 15, 16).
  • the "reference position” is the position of the first edge 92 of the metal plate 90 when the longitudinal direction of the metal plate 90 is parallel to the conveying direction by the rolling mill device 2.
  • the “reference position” may be the center position of the metal plate 90 in the plate width direction (the position of the center line Lc) when the longitudinal direction of the metal plate 90 is parallel to the conveying direction by the rolling mill device 2.
  • step S206 it is determined that the displacement amount ⁇ e is smaller than the threshold (NO in step S206), and the process returns to step S202 to detect the plate end position x B by the second plate end detection part 34 again.
  • FIG. 12B shows the stage where the tip end bending of the metal plate 90 occurs due to some disturbance (e.g., non-uniformity of the thickness of the metal plate 90 in the plate width direction) from the state shown in FIG. 12A .
  • the plate end position x B detected in step S202 is deviated from the reference position to the first edge 92 side (one side) in the plate width direction.
  • the outgoing direction of the metal plate 90 from the mill rolls 15, 16 is displaced to the first edge 92 side (one side) in the plate width direction with respect to the conveying direction by the mill rolls 15, 16.
  • the displacement amount ⁇ e calculated in step S204 is greater than zero.
  • the displacement amount ⁇ e starts to increase from zero at time t21, and the displacement amount ⁇ e reaches the maximum at time t23 (the state shown in FIG. 12B ).
  • step S204 If the displacement amount ⁇ e calculated in step S204 is not greater than the threshold ⁇ e_th (NO in step S206), the process returns to step S202 to detect the plate end position x B by the second plate end detection part 34 again. Conversely, if the displacement amount ⁇ e calculated in step S204 is greater than the threshold ⁇ e_th (YES in step S206, time t23 in the graph of FIG. 13 ), a tilting control of the mill rolls 15, 16 by the roll reduction device 22 is performed in step S208 so that the displacement amount ⁇ e is zero (step S208).
  • step S208 the roll tilting control of the pair of mill rolls 15, 16 is performed so that the outgoing direction of the metal plate 90 from the mill rolls 15, 16 is along the conveying direction of the metal plate 90 in the rolling mill device 2 (first tilting step).
  • FIG. 12C shows the stage at the completion of step S208 (when the displacement amount ⁇ e is zero; time t24 in the graph of FIG. 13 ).
  • the elongation of the metal plate 90 on the second edge 93 side is E1
  • the elongation of the metal plate 90 on the first edge 92 side is zero. That is, the first elongation difference is E1.
  • the first elongation difference E1 is calculated based on a time integral (area S 1B ' shown in the graph of FIG. 13 ) of the displacement amount ⁇ e of the plate end position x B with respect to the reference position from the time the plate end position x B moves away from the reference position to the one side (the first edge 92 side) (time t21 in the graph of FIG. 13 ) until the plate end position x B returns to the reference position (time t24 in the graph of FIG. 13 ) in the first tilting step.
  • a remaining time Tc until the tip end 91 of the metal plate 90 reaches the winding device 14 disposed downstream of the pair of mill rolls 15, 16 is calculated (step S212; remaining time calculation step).
  • the starting point of the remaining time Tc may be, for example, the point when the displacement amount ⁇ e becomes zero in the first tilting step (at the completion of step S208; time t24 in the graph of FIG. 13 ), or the start of the second tilting step (at the start of steps S214 to S218 described below; time t25 in the graph of FIG. 13 ).
  • the time from the start of the second tilting step (time t25) to time t27 is the remaining time Tc.
  • the remaining time Tc can be calculated based on the distance between the tip end 91 of the metal plate 90 and the winding device 14, and the conveyance speed of the metal plate 90.
  • FIG. 12D shows the state at the completion of the second tilting step (i.e., the state at the completion of step S218).
  • step S214 the control command values for the driving motors of the roll reduction device 22 and the mill rolls 15, 16 are calculated so that a second elongation difference E2 (see FIG. 12D ) equal to the first elongation difference E1 is applied to the metal plate 90 within the remaining time Tc.
  • the second elongation difference E2 is a relative second elongation difference on the one side (first edge 92 side) of the metal plate 90 relative to the other side (second edge 93 side).
  • the plate end position x B is displaced to the second edge 93 side by the displacement amount ⁇ e, as shown in FIGs. 12D and 13 .
  • the second elongation difference E2 can be given to the metal plate 90 to form the triangle shown by the sign S 2B in FIG. 12D . This is because there is a specific correlation between the triangle indicated by the sign S 2B in FIG. 12D and the area S 2B ' in the graph of FIG. 13 , and the triangle indicated by the sign S 2A in FIG. 12D is similar to the triangle indicated by the sign S 2B .
  • step S216 tilting control of the mill rolls 15, 16 is performed based on the control command values calculated in step S214. While the difference
  • the first elongation difference E1 caused by the tip end bending of the metal plate 90 indicates the magnitude of the displacement of the outgoing direction of the metal plate 90 to one side in the plate width direction.
  • the first elongation difference E1 caused by the tip end bending of the metal plate 90 is calculated, and the roll tilting control of the mill rolls 15, 16 is performed so that the second elongation difference E2 is equal to the first elongation difference E1.
  • the roll tilting control is performed so that an elongation (corresponding to the second elongation difference E2) equal to the elongation (corresponding to the first elongation difference E1) caused on one side (the first edge 92 side) of the metal plate 90 due to the tip end bending of the metal plate 90 is applied to the other side (the second edge 93 side) of the metal plate 90, the tip end bending of the metal plate 90 can be appropriately corrected, and the front edge (tip end 91) of the metal plate 90 can be brought closer to parallel to the axial direction of the winding device 14.
  • the metal plate rolled with no tension applied to the tip end can be wound by the winding device appropriately.
  • the first elongation difference E1 caused in the metal plate 90 due to the tip end bending of the metal plate 90 has a correlation with the time integral of the displacement amount ⁇ e of the plate end position x B with respect to the reference position, and typically, the first elongation difference E1 and the time integral of the displacement amount ⁇ e have a proportional relationship.
  • the first elongation difference E1 can be appropriately calculated based on the time integral of the displacement amount ⁇ e. Therefore, by performing the roll tilting control in the second tilting step to apply the second elongation difference E2 equal to the first elongation difference E1 thus calculated to the metal plate 90, the tip end bending of the metal plate 90 can be appropriately corrected.
  • the remaining time Tc until the tip end 91 of the metal plate 90 reaches the winding device 14 is calculated, and the second elongation difference E2 is applied to the metal plate 90 within the calculated remaining time Tc, so that the tip end bending of the metal plate 90 can be appropriately corrected before the metal plate 90 starts to be wound.
  • the first elongation difference E1 is calculated based on the time integral of the displacement amount ⁇ e of the detected plate end position x B from the reference position, and the roll tilting control of the mill rolls 15, 16 is performed based on this first elongation difference E1.
  • the roll tilting control of the mill rolls 15, 16 is performed based on the displacement angle of the outgoing direction of the metal plate 90 with respect to the conveying direction when the tip end bending of the metal plate 90 occurs. More specifically, in the embodiment according to the flowchart of FIG. 14 , on the basis of a displacement angle ⁇ 1 (see FIG.
  • a second displacement angle ⁇ 2 (see FIG. 15C ) of the outgoing direction to the other side (second edge 93 side) with respect to the conveying direction during execution of the second tilting step is determined.
  • steps S302, S304, S306, S312, S316, and S318 are the same as in steps S202, S204, S206, S212, S216, and S218 shown in FIG. 11 , so detailed explanations will be omitted.
  • step S304 if the displacement amount ⁇ e calculated in step S304 based on the plate end position x B detected in step S302 (detection step) is greater than a threshold (YES in step S306), the first displacement angle ⁇ 1 of the outgoing direction of the metal plate 90 to one side (the first edge 92 side) with respect to the conveying direction at this point (the start point of the first tilting step; stage shown in FIG. 15B ) is acquired (step S308).
  • the first displacement angle ⁇ 1 may be acquired based on an image captured by an imaging device.
  • a second displacement angle ⁇ 2 to be given to the metal plate 90 in the second tilting step i.e., the second displacement angle ⁇ 2 of the outgoing direction of the metal plate 90 to the other side (the second edge 93 side) with respect to the conveying direction is determined (step S310; see FIG. 15C ).
  • step S316 the tilting control (first tilting step and second tilting step) of the mill rolls 15, 16 is performed (step S316).
  • step S3108 If the displacement angle to the other side (the second edge 93 side) of the metal plate 90 reaches the second displacement angle ⁇ 2 (YES in step S318), the tip end bending of the metal plate 90 detected in steps S302 to S306 has been corrected, and the process returns to step S302 to detect the next possible tip end bending of the metal plate 90.
  • the first displacement angle ⁇ 1 of the outgoing direction of the metal plate 90 to one side (first edge 92 side) with respect to the conveying direction caused by the tip end bending of the metal plate 90 indicates the magnitude of the displacement of the outgoing direction of the metal plate 90 to one side (first edge 92 side) in the plate width direction as well as the first elongation difference E1 described above.
  • the second displacement angle ⁇ 2 of the outgoing direction to the other side with respect to the conveying direction during execution of the second tilting step can be appropriately determined based on the first displacement angle ⁇ 1.
  • the tip end bending of the metal plate 90 can be appropriately corrected, and the front edge of the metal plate 90 can be brought close to parallel to the axial direction of the winding device 14.
  • the metal plate 90 rolled with no tension applied to the tip end can be wound by the winding device 14 appropriately.
  • the second displacement angle ⁇ 2 determined in step S310 may be given to the metal plate 90 at once in the second tilting step of step S316 (see FIG. 15C ), or may be divided and given to the metal plate 90 at separate times (see FIG. 15D ).
  • angle ⁇ 2a is given for the first time
  • angle ⁇ 2b for the second time
  • angle ⁇ 2c for the third time as the displacement angle to the other side (second edge 93 side) of the metal plate 90.
  • the second tilting step is started within a time equal to or less than the time required for the first tilting step.
  • the time required for the first tilting step (from the YES determination in step S206 of FIG. 11 to the end of step S208) is from time t22 to time t24 in the graph of FIG. 13 .
  • the time from the end of the first tilting step to the start of the second tilting step is from time t24 to t25 in the graph of FIG. 13 , which is shorter than the time required for the first tilting step.
  • the first tilting step and the second tilting step are performed without distinction (continuously) in step S316, and the time from the end of the first tilting step to the start of the second tilting step is substantially zero, which is smaller than the time required for the first tilting step (from the time when the outgoing direction of the metal plate 90 is displaced to one side (the first edge 92 side) until it returns to the same direction as the conveying direction).
  • the second tilting step is started within a time equal to or less than the time required for the first tilting step to displace the outgoing direction of the metal plate 90 to the other side (second edge 93 side). That is, by displacing the outgoing direction of the metal plate 90 to the other side (the second edge 93 side) without much time after the completion of the first tilting step, it is possible to reduce the displacement amount ( ⁇ d shown in FIG.
  • the plate end positions (first plate end position and second plate end position) in the plate width direction of the metal plate are detected at the first position on the entry side and the second position on the exit side of the pair of mill rolls. Accordingly, on the basis of these detection results, it is possible to ascertain the degree of inclination of the longitudinal direction of the metal plate with respect to the conveying direction before the tip end tension-free rolling is started, that is, it is possible to ascertain the degree of inclination of the outgoing direction of the metal plate with respect to the conveying direction at the start of tip end tension-free rolling. Further, in the above configuration (1), it is determined whether the tip end tension-free rolling can be started based on the detection results of the first plate end position and the second plate end position.
  • the longitudinal direction of the metal plate i.e., the outgoing direction of the metal plate at the start of rolling
  • the tip end tension-free rolling of the metal plate can be started.
  • the tip end tension-free rolling can be started in a state where the outgoing direction of the metal plate is almost parallel to the conveying direction, so that the tip end portion of the metal plate can be prevented from deviating from the conveyance line by the rolling mill in the plate width direction.
  • it is easy to appropriately wind the rolled metal plate by the winding device.
  • the tip end tension-free rolling can be started in a state where the outgoing direction of the metal plate is almost parallel to the conveying direction, by using the second plate end position obtained at the start of tip end tension-free rolling as a reference, the control of the rolling mill, such as meandering control of the metal plate, can be appropriately performed based on the second plate end position detected during the tip end tension-free rolling.
  • the metal plate rolled with no tension applied to the tip end can be wound by the winding device appropriately.
  • the determination part is configured to determine that the tip end tension-free rolling of the metal plate can be started if a difference between the first plate end position and the second plate end position is within a predetermined range.
  • the difference between the first plate end position and the second plate end position indicates the degree of inclination of the direction connecting the first plate end position and the second plate end position, i.e., the longitudinal direction of the metal plate with respect to the conveying direction of the metal plate by the rolling mill.
  • the fact that the difference between the first plate end position and the second plate end position is zero indicates that the longitudinal direction of the metal plate is parallel to the conveying direction.
  • the tip end tension-free rolling of the metal plate can be started.
  • the metal plate rolled with no tension applied to the tip end can be wound by the winding device appropriately as described in (1).
  • the determination part is configured to determine that the tip end tension-free rolling of the metal plate can be started if a difference between the first plate end position and a reference position in the plate width direction of the metal plate and a difference between the second plate end position and the reference position are within a predetermined range.
  • the difference between the first plate end position and the reference position in the plate width direction and the difference between the second plate end position and the same reference position indicate the magnitude of displacement of the plate end positions with respect to the reference position at the first position and the second position in the conveying direction, respectively.
  • the tip end tension-free rolling of the metal plate can be started.
  • the metal plate rolled with no tension applied to the tip end can be wound by the winding device appropriately as described in (1).
  • the control device for the rolling mill device further comprises a rolling control part for controlling operation of the pair of mill rolls.
  • the rolling control part is configured to bring, if it is determined by the determination part that the tip end tension-free rolling of the metal plate can be started, the pair of mill rolls into contact with the metal plate and then, while rotating the pair of mill rolls, adjust a rolling reduction and a rotation speed of the pair of mill rolls so that a gap between the pair of mill rolls gradually decreases to a control value corresponding to a target thickness of the metal plate as the metal plate is conveyed.
  • the thickness difference between the tip end portion, which is not rolled by the mill rolls, and the following portion, which is rolled, of the metal plate may become large.
  • stress may concentrate at the boundary between the tip end portion and the following portion, and the metal plate may be broken at this boundary.
  • the pair of mill rolls are brought into contact with the metal plate, and then while rotating the pair of mill rolls, the rolling reduction and the rotation speed of the pair of mill rolls are adjusted so that the gap between the mill rolls gradually decreases to the control value corresponding to the target thickness of the metal plate as the metal plate is conveyed.
  • the transition portion where the thickness gradually decreases is formed between the tip end portion, which has the same thickness as before rolling, and the following portion, which is rolled to the target thickness.
  • the control device for the rolling mill device comprises: a first tilting part configured to perform, when a detection result of the second plate end position by the second plate end detection part is deviated from a reference position to one side in the plate width direction after the tip end tension-free rolling of the metal plate is started, a roll tilting control of the pair of mill rolls so that an outgoing direction of the metal plate from the mill rolls is along the conveying direction of the metal plate in the rolling mill device; and a second tilting part configured to perform a roll tilting control of the pair of mill rolls after the roll tilting control by the first tilting part so that the outgoing direction of the metal plate from the mill rolls is displaced to the other side in the plate width direction with respect to the conveying direction, and then the outgoing direction of the metal plate returns to the conveying direction.
  • the plate end position in the plate width direction of the metal plate is detected at the position on the exit side of the mill rolls. This allows to detect the displacement of the outgoing direction of the metal plate to one side in the plate width direction (tip end bending of the metal plate) based on the fact that the detected plate end position has deviated from the reference position to one side in the plate width direction.
  • the roll tilting control is performed to make the outgoing direction of the metal plate parallel to the conveying direction of the metal plate in the rolling mill device, and then the roll tilting control is performed to displace the outgoing direction of the metal plate to the other side in the plate width direction with respect to the conveying direction and then make the outgoing direction parallel to the conveying direction.
  • This allows to correct the tip end bending of the metal plate, and the tip end tension-free rolling to continue with the front edge of the metal plate close to parallel to the axial direction of the winding device. Therefore, with the above configuration (5), the metal plate rolled with no tension applied to the tip end can be wound by the winding device appropriately.
  • a rolling mill facility comprises: a pair of mill rolls disposed on opposite sides of a metal plate; and the control device described in any one of the above (1) to (5).
  • the plate end positions (first plate end position and second plate end position) in the plate width direction of the metal plate are detected at the first position on the entry side and the second position on the exit side of the pair of mill rolls. Accordingly, on the basis of these detection results, it is possible to ascertain the degree of inclination of the longitudinal direction of the metal plate with respect to the conveying direction before the tip end tension-free rolling is started, that is, it is possible to ascertain the degree of inclination of the outgoing direction of the metal plate with respect to the conveying direction at the start of tip end tension-free rolling. Further, in the above configuration (6), it is determined whether the tip end tension-free rolling can be started based on the detection results of the first plate end position and the second plate end position.
  • the longitudinal direction of the metal plate i.e., the outgoing direction of the metal plate at the start of rolling
  • the tip end tension-free rolling of the metal plate can be started.
  • the tip end tension-free rolling can be started in a state where the outgoing direction of the metal plate is almost parallel to the conveying direction, so that the tip end portion of the metal plate can be prevented from deviating from the conveyance line by the rolling mill in the plate width direction.
  • it is easy to appropriately wind the rolled metal plate by the winding device.
  • the control of the rolling mill such as meandering control of the metal plate, can be appropriately performed based on the second plate end position detected during the tip end tension-free rolling.
  • the metal plate rolled with no tension applied to the tip end can be wound by the winding device appropriately.
  • the rolling mill facility further comprises a winding device disposed downstream of the second plate end detection part in the conveying direction, and when a distance between the pair of mill rolls and the winding device in the conveying direction is defined as L2, a distance between the pair of mill rolls and the second plate end detection part in the conveying direction is 0.1 ⁇ L2 or less.
  • the tip end of the metal plate In order to detect the plate end position (second plate end position) of the metal plate by the second plate end detection part disposed on the exit side of the mill rolls, the tip end of the metal plate needs to be placed at the same position as or downstream of the second plate detection part in the conveying direction.
  • the second plate end position can be detected at the start of tension-free rolling and during tension-free rolling while keeping the tip end of the metal plate relatively close to the mill rolls at the start of tension-free rolling. Therefore, the tip end tension-free rolling can be appropriately performed while reducing the length of the tip end portion of the metal plate not to be rolled, so that the yield of the metal plate can be effectively improved.
  • the rolling mill facility further comprises an unwinding device disposed upstream of the first plate end detection part in the conveying direction, and when a distance between the pair of mill rolls and the unwinding device in the conveying direction is defined as L1, a distance between the pair of mill rolls and the first plate end detection part in the conveying direction is 0.1 ⁇ L1 or less.
  • the rolling mill device reverse mill
  • the conveying direction of the metal plate is reversed, and the rolling with the mill rolls starts from the rear end side of the metal plate.
  • the first plate end position can be detected at the start of tension-free rolling and during tension-free rolling while keeping the rear end of the metal plate relatively close to the mill rolls at the start of tension-free rolling in the second pass. Therefore, the tip end tension-free rolling can be appropriately performed while reducing the length of the rear end portion of the metal plate not to be rolled, so that the yield of the metal plate can be effectively improved.
  • the rolling mill facility comprises a plate thickness gauge disposed on at least one of an entry side or an exit side of the pair of mill rolls in the conveying direction and configured to measure a thickness of the metal plate.
  • the first plate end detection part or the second plate end detection part is disposed between the pair of mill rolls and the plate thickness gauge in the conveying direction.
  • the plate thickness gauge used to control the thickness of the metal plate is preferably disposed near the mill rolls in the conveying direction to ensure good control response.
  • the first plate end detection part or the second plate end detection part is disposed closer to the mill rolls than the plate thickness gauge for measuring the thickness of the metal plate, the first plate end position or the second plate end position can be detected at the start of tension-free rolling and during tension-free rolling while keeping the tip end of the metal plate relatively close to the mill rolls at the start of tension-free rolling. Therefore, the tip end tension-free rolling can be appropriately performed while reducing the length of the tip end portion of the metal plate not to be rolled, so that the yield of the metal plate can be effectively improved.
  • the first plate end detection part or the second plate end detection part is configured to detect the first plate end position or the second plate end position using radiation.
  • the vicinity of the mill rolls is often a harsh environment, such as a large amount of rolling oil and fumes, vibration of the mill rolls, and darkness.
  • the first plate end detection part or the second plate end detection part is configured to detect the plate end position using radiation, it is possible to detect the plate end position appropriately even if they are disposed in the vicinity of the mill rolls in a harsh environment.
  • the rolling mill facility comprises: a pair of first mill rolls which is the pair of mill rolls; a pair of second mill rolls which is the pair of mill rolls and disposed downstream of the pair of first mill rolls in the conveying direction; an unwinding device disposed upstream of the pair of first mill rolls; and a winding device disposed downstream of the pair of second mill rolls.
  • the control device is configured to determine whether a first tip end tension-free rolling of the metal plate by the pair of first mill rolls can be started, and if it is determined that the first tip end tension-free rolling can be started, after the tip end tension-free rolling by the pair of first mill rolls is started, determine whether a second tip end tension-free rolling of the metal plate by the pair of second mill rolls can be started.
  • a method for operating a rolling mill device is a method for operating a rolling mill device including a pair of mill rolls disposed on opposite sides of a metal plate, comprising: a first plate end detection step of detecting a first plate end position which is a plate end position in a plate width direction of the metal plate at a first position on an entry side of the pair of mill rolls in a conveying direction of the metal plate; a second plate end detection step of detecting a second plate end position which is a plate end position in the plate width direction of the metal plate at a second position on an exit side of the pair of mill rolls in the conveying direction; and a determination step of determining whether tip end tension-free rolling, which is rolling of the metal plate by the pair of mill rolls in a state where an exit-side tension of the metal plate is zero, can be started, on the basis of 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.
  • the plate end positions (first plate end position and second plate end position) in the plate width direction of the metal plate are detected at the first position on the entry side and the second position on the exit side of the pair of mill rolls. Accordingly, on the basis of these detection results, it is possible to ascertain the degree of inclination of the longitudinal direction of the metal plate with respect to the conveying direction before the tip end tension-free rolling is started, that is, it is possible to ascertain the degree of inclination of the outgoing direction of the metal plate with respect to the conveying direction at the start of tip end tension-free rolling. Further, in the above method (12), it is determined whether the tip end tension-free rolling can be started based on the detection results of the first plate end position and the second plate end position.
  • the longitudinal direction of the metal plate i.e., the outgoing direction of the metal plate at the start of rolling
  • the tip end tension-free rolling of the metal plate can be started.
  • the tip end tension-free rolling can be started in a state where the outgoing direction of the metal plate is almost parallel to the conveying direction, so that the tip end portion of the metal plate can be prevented from deviating from the conveyance line by the rolling mill in the plate width direction.
  • it is easy to appropriately wind the rolled metal plate by the winding device.
  • the tip end tension-free rolling can be started in a state where the outgoing direction of the metal plate is almost parallel to the conveying direction, by using the second plate end position obtained at the start of tip end tension-free rolling as a reference, the control of the rolling mill, such as meandering control of the metal plate, can be appropriately performed based on the second plate end position detected during the tip end tension-free rolling.
  • the metal plate rolled with no tension applied to the tip end can be wound by the winding device appropriately.
  • an expression of relative or absolute arrangement such as “in a direction”, “along a direction”, “parallel”, “orthogonal”, “centered”, “concentric” and “coaxial” shall not be construed as indicating only the arrangement in a strict literal sense, but also includes a state where the arrangement is relatively displaced by a tolerance, or by an angle or a distance whereby it is possible to achieve the same function.
  • an expression of an equal state such as “same” “equal” and “uniform” shall not be construed as indicating only the state in which the feature is strictly equal, but also includes a state in which there is a tolerance or a difference that can still achieve the same function.
  • an expression of a shape such as a rectangular shape or a cylindrical shape shall not be construed as only the geometrically strict shape, but also includes a shape with unevenness or chamfered corners within the range in which the same effect can be achieved.
  • an expression such as “comprise”, “include”, “have” are not intended to be exclusive of other components.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)

Claims (10)

  1. Steuervorrichtung (100) zum Steuern einer Walzwerkvorrichtung (2) mit einem Paar von Walzrollen (15, 16), die auf gegenüberliegenden Seiten einer Metallplatte (90) angeordnet sind, wobei die Steuervorrichtung (100) umfasst:
    ein erstes Plattenende-Erfassungsteil (32), das an einer Eingangsseite des Paars von Walzrollen (15, 16) in einer Förderrichtung der Metallplatte (90) angeordnet ist und so konfiguriert ist, dass es eine Plattenende-Position (x1) in einer Plattenbreitenrichtung der Metallplatte (90) an einer ersten Position (Y1) in der Förderrichtung erfasst;
    ein zweites Plattenende-Erfassungsteil (34), das an einer Ausgangsseite des Paars von Walzwerkswalzen (15, 16) in der Förderrichtung angeordnet und konfiguriert ist, um eine Plattenendeposition (x2) in der Plattenbreitenrichtung der Metallplatte (90) an einer zweiten Position (Y2) in der Förderrichtung zu erfassen; und
    einen Bestimmungsteil (42), der so konfiguriert ist, dass er bestimmt, ob ein zugfreies Walzen des vorderen Endes, d.h. ein Walzen der Metallplatte (90) durch das Paar Walzwerkswalzen (15, 16) in einem Zustand gestartet werden kann, in dem eine auf die Metallplatte (90) ausgeübter ausgangsseitiger Zug Null beträgt, begonnen werden kann, auf der Grundlage der ersten Plattenende-Position (x1) der Metallplatte (90), die von dem ersten Plattenende-Erfassungsteil (32) erfasst wird, während ein Spalt zwischen dem Paar von Walzrollen (15, 16) größer als eine Dicke der Metallplatte (90) ist, und der zweiten Plattenende-Position der Metallplatte, die von dem zweiten Plattenende-Erfassungsteil (34) erfasst wird, während der Spalt größer als die Dicke der Metallplatte (90) ist.
  2. Steuervorrichtung (100) für eine Walzwerkvorrichtung (2) nach Anspruch 1,
    wobei der Bestimmungsteil (42) so konfiguriert ist, dass er bestimmt, dass das zugfreie Walzen der Metallplatte (90) am vorderen Ende begonnen werden kann, wenn eine Differenz zwischen der ersten Plattenende-Position (x1) und der zweiten Plattenende-Position (x2) innerhalb eines vorgegebenen Bereichs liegt.
  3. Steuervorrichtung (100) für eine Walzwerkeinrichtung (2) nach Anspruch 1,
    wobei der Bestimmungsteil (42) so konfiguriert ist, dass er bestimmt, dass das zugfreie Walzen der Metallplatte (90) am vorderen Ende gestartet werden kann, wenn eine Differenz zwischen der ersten Plattenende-Position (x1) und einer Referenzposition in der Plattenbreitenrichtung der Metallplatte (90) und eine Differenz zwischen der zweiten Plattenende-Position (x2) und der Referenzposition innerhalb eines vorbestimmten Bereichs liegen.
  4. Steuervorrichtung (100) für eine Walzwerkvorrichtung (2) nach einem der Ansprüche 1 bis 3, ferner umfassend ein Walzsteuerteil (44) zum Steuern des Betriebs des Walzwerkrollenpaares (15, 16),
    wobei das Walzsteuerteil (44) so konfiguriert ist, dass es, wenn durch das Bestimmungsteil (42) bestimmt wird, dass das zugfreie Walzen der Metallplatte (90) am vorderen Ende begonnen werden kann, den Spalt zwischen dem Paar von Walzrollen (15, 16) verringert, um das Paar von Walzrollen (15, 16) in Kontakt mit der Metallplatte (90) zu bringen und dann, während der Drehung des Walzrollenpaares (15, 16) eine Walzreduzierung und eine Drehgeschwindigkeit des Walzrollenpaares (15, 16) einstellen, so dass der Spalt zwischen dem Walzrollenpaar (15, 16) allmählich auf einen Steuerwert abnimmt, der einer Solldicke der Metallplatte (90) entspricht, während die Metallplatte (90) befördert wird.
  5. Steuervorrichtung (100) für eine Walzwerkvorrichtung (2) nach einem der Ansprüche 1 bis 4, umfassend:
    ein erstes Nivellierungsteil, das so konfiguriert ist, dass es, wenn ein Erfassungsergebnis der zweiten Plattenende-Position (x2) durch das zweite Plattenende-Erfassungsteil (34) von einer Referenzposition (xref) zu einer Seite in der Plattenbreitenrichtung abweicht, nachdem das zugfreie Walzen der Metallplatte (90) am vorderen Ende begonnen hat, eine Walzen-Nivellierungssteuerung des Paares von Walzwerkswalzen (15, 16) durchführt, so dass eine Austrittsrichtung der Metallplatte aus den Walzwerkswalzen (15, 16) entlang der Förderrichtung der Metallplatte (90) in der Walzwerkvorrichtung (2) verläuft; und
    ein zweites Nivellierteil, das so konfiguriert ist, dass es eine Walzen-Nivelliersteuerung des Paares von Walzrollen (15, 16) nach der Walzen-Nivelliersteuerung durch das erste Nivellierteil durchführt, so dass die Austrittsrichtung der Metallplatte (90) aus den Walzrollen (15, 16) zur anderen Seite in der Plattenbreitenrichtung in Bezug auf die Förderrichtung verschoben wird, und dann die Austrittsrichtung der Metallplatte (90) zur Förderrichtung zurückkehrt.
  6. Eine Walzwerkanlage, die Folgendes umfasst:
    ein Paar Walzrollen (15, 16), die auf gegenüberliegenden Seiten einer Metallplatte (90) angeordnet sind; und
    die Steuereinrichtung (100) nach einem der Ansprüche 1 bis 5.
  7. Walzwerkeinrichtung nach Anspruch 6, umfassend ein Plattendickenmessgerät (36, 38), das an mindestens einer Eingangsseite oder einer Ausgangsseite des Paars von Walzrollen (15, 16) in der Förderrichtung angeordnet ist und zum Messen einer Dicke der Metallplatte (90) konfiguriert ist,
    wobei das erste Plattenende-Erfassungsteil (32) oder das zweite Plattenende-Erfassungsteil (34) an einer Position angeordnet ist, die näher an dem Paar von Walzwerkswalzen (15, 16) ist als das Plattendickenmessgerät (36, 38) oder an der gleichen Position wie das Plattendickenmessgerät (36, 38).
  8. Walzwerkanlage nach Anspruch 6 oder 7,
    wobei das erste Plattenende-Erfassungsteil (32) oder das zweite Plattenende-Erfassungsteil (34) so konfiguriert ist, dass es die erste Plattenende-Position (x1) oder die zweite Plattenende-Position (x2) unter Verwendung von Strahlung erfasst.
  9. Walzwerkanlage nach einem der Ansprüche 6 bis 8, umfassend:
    ein Paar erster Walzrollen (15A, 16A), das das Paar Walzrollen ist;
    ein Paar zweiter Walzenrollen (15B, 16b), das das Paar von Walzen ist und in Förderrichtung hinter dem Paar erster Walzen (15A, 16A) angeordnet ist;
    eine Abwickelvorrichtung (4), die stromaufwärts des Paares der ersten Walzen (15A, 16A) angeordnet ist; und
    eine Aufwickelvorrichtung (14), die stromabwärts des Paares der zweiten Walzen (15B, 16B) angeordnet ist,
    wobei die Steuervorrichtung (100) konfiguriert ist, um zu bestimmen, ob ein erstes zugfreies Walzen der Metallplatte (90) am vorderen Ende durch das Paar erster Walzrollen (15A, 16A) gestartet werden kann, und wenn bestimmt wird, dass das erste zugfreie Walzen am vorderen Ende gestartet werden kann, nachdem das zugfreie Walzen am Kopfende durch das Paar erster Walzrollen (15A, 16A) gestartet wurde, zu bestimmen, ob ein zweites zugfreies Walzen der Metallplatte (90) am vorderen Ende durch das Paar zweiter Walzrollen (15B, 16B) gestartet werden kann.
  10. Verfahren zum Betreiben einer Walzwerkvorrichtung (2) mit einem Paar von Walzrollen (15, 16), die auf gegenüberliegenden Seiten eines Metallblechs (90) angeordnet sind, wobei das Verfahren umfasst:
    einen ersten Schritt zur Erfassung des Plattenendes, bei dem, während ein Spalt zwischen dem Paar Walzrollen (15, 16) größer ist als eine Dicke der Metallplatte (90), eine erste Plattenende-Position (x1) erfasst wird, die eine Plattenende-Position in einer Plattenbreitenrichtung der Metallplatte (90) an einer ersten Position (Y1) auf einer Eingangsseite des Paares von Walzrollen (15, 16) in einer Förderrichtung der Metallplatte (90) ist;
    einen zweiten Plattenende-Erfassungsschritt, bei dem, während der Spalt größer als die Dicke der Metallplatte (90) ist, eine zweite Plattenende-Position (x2) erfasst wird, die eine Plattenende-Position in der Plattenbreitenrichtung der Metallplatte (90) an einer zweiten Position (Y2) an einer Austrittsseite des Paares von Walzwerkswalzen (15, 16) in der Förderrichtung ist; und
    einen Bestimmungsschritt zum Bestimmen, ob ein zugfreies Walzen des vorderen Ende, das ein Walzen der Metallplatte (90) durch das Walzwerkwalzenpaar (15, 16) in einem Zustand ist, in dem ein ausgangsseitiger Zug auf die Metallplatte (90) Null beträgt, auf der Grundlage der ersten Plattenende-Position (x1), die in dem ersten Plattenende-Erfassungsschritt erfasst wird, und der zweiten Plattenende-Position (x2), die in dem zweiten Plattenende-Erfassungsschritt erfasst wird, begonnen werden kann.
EP19937138.6A 2019-07-11 2019-07-11 Steuervorrichtung für eine walzvorrichtung, walzvorrichtung und verfahren zum betrieb einer walzvorrichtung Active EP3974074B1 (de)

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JPH0220608A (ja) * 1988-07-05 1990-01-24 Sumitomo Metal Ind Ltd 圧延材の蛇行制御方法
JPH07132310A (ja) * 1993-11-10 1995-05-23 Mitsubishi Heavy Ind Ltd 圧延方法
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JPH11179414A (ja) 1997-12-24 1999-07-06 Nkk Corp 冷間圧延機における片伸び量推定方法及び形状制御方法
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EP3974074A4 (de) 2022-05-18
WO2021005778A1 (ja) 2021-01-14
CN114007771A (zh) 2022-02-01
JP7150994B2 (ja) 2022-10-11

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