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EP3715002B1 - Dispositif de laminage et procédé de fonctionnement d'un dispositif de laminage - Google Patents

Dispositif de laminage et procédé de fonctionnement d'un dispositif de laminage Download PDF

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Publication number
EP3715002B1
EP3715002B1 EP19739502.3A EP19739502A EP3715002B1 EP 3715002 B1 EP3715002 B1 EP 3715002B1 EP 19739502 A EP19739502 A EP 19739502A EP 3715002 B1 EP3715002 B1 EP 3715002B1
Authority
EP
European Patent Office
Prior art keywords
metal strip
exit
rolling
rolling mill
mill rolls
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP19739502.3A
Other languages
German (de)
English (en)
Other versions
EP3715002A4 (fr
EP3715002A1 (fr
EP3715002B2 (fr
Inventor
Yoichi Matsui
Yuta ODAWARA
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Primetals Technologies Japan Ltd
Original Assignee
Primetals Technologies Japan Ltd
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Filing date
Publication date
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Application filed by Primetals Technologies Japan Ltd filed Critical Primetals Technologies Japan Ltd
Publication of EP3715002A4 publication Critical patent/EP3715002A4/fr
Publication of EP3715002A1 publication Critical patent/EP3715002A1/fr
Publication of EP3715002B1 publication Critical patent/EP3715002B1/fr
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Classifications

    • 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
    • B21B37/52—Tension control; Compression control by drive motor control
    • B21B37/54—Tension control; Compression control by drive motor control including coiler drive control, e.g. reversing mills
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B1/30—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a non-continuous process
    • B21B1/32—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a non-continuous process in reversing single stand mills, e.g. with intermediate storage reels for accumulating work
    • 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
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C47/00—Winding-up, coiling or winding-off metal wire, metal band or other flexible metal material characterised by features relevant to metal processing only
    • 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
    • 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
    • B21B2015/0064—Uncoiling 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
    • B21B2265/04—Front or inlet tension
    • 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
    • B21B2265/00—Forming parameters
    • B21B2265/20—Slip
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2275/00—Mill drive parameters
    • B21B2275/02—Speed
    • B21B2275/04—Roll speed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2275/00—Mill drive parameters
    • B21B2275/02—Speed
    • B21B2275/06—Product speed

Definitions

  • the present disclosure relates to a rolling equipment, and a rolling device operation method.
  • a rolling device for rolling a metal strip by moving the metal strip, which is passed through a pair of rolling mill rolls, back and forth
  • rolling is normally performed while pressing and rotating the rolling mill rolls in a state where the metal strip is wound around an unwinding device and a winding device which are provided on both sides of the rolling mill rolls in a traveling direction of the metal strip, and applying tension to the metal strip by the unwinding device and the winding device.
  • a rolling device it is necessary to set the state where a tip part of the metal strip is wound around the winding device when starting to roll the metal strip. Therefore, a portion of the metal strip which is located closer to the winding device than the rolling mill rolls when starting to roll the metal strip cannot be rolled and this portion thereby cannot be formed into a product.
  • Patent Document 1 describes that a leader piece (lead material) is bonded to a tip part of the metal strip by means of welding and this leader piece is wound up by the winding device, so that the rolling is thereby started while applying exit-side tension to the metal strip via the leader piece. Accordingly, an attempt is made to roll the metal strip from a position closer to its tip side and thereby improve the yield by starting the rolling in the state where the leader piece is bonded to the metal strip.
  • Patent Document 1 JP4508949 B A rolling equipment with the features in the pre-characterizing portion of Claim 1 and a rolling device operation method with the features in the pre-characterizing portion of Claim 10 are disclosed in US 6 014 882 A .
  • a rolling equipment and a rolling device operation method which are capable of improving the yield of the metal strip with a simple configuration are provided.
  • FIG. 1 is a schematic configuration diagram of rolling equipment including a control device according to one embodiment.
  • rolling equipment 1 includes a rolling device 2 and a control device 30 for controlling the rolling device 2.
  • the rolling device 2 illustrated in FIG. 1 is a rolling device (reverse mill) for rolling a metal strip 50 by moving the metal strip 50, which is passed through a pair of rolling mill rolls 16A, 16B, back and forth.
  • the rolling device 2 includes a rolling mill 10 including the pair of rolling mill rolls (work rolls) 16A, 16B provided to sandwich the metal strip 50, which is a material to be rolled, an unwinding device 4 provided on an entrance side of the rolling mill rolls 16A, 16B in a traveling direction of the metal strip 50, and a winding device 14 provided on an exit side of the rolling mill rolls 16A, 16B in the traveling direction of the metal strip 50; and is configured to roll the metal strip 50 by the pair of rolling mill rolls 16A, 16B.
  • the rolling mill 10 includes, in addition to the pair of rolling mill rolls (work rolls) 16A, 16B, a pair of intermediate rolls 18A, 18B and a pair of backup rolls 20A, 20B, where the intermediate rolls 18A, 18B and the backup rolls 20A, 20B sandwich the pair of rolling mill rolls 16A, 16B and are provided respectively on opposite sides of the metal strip 50.
  • the intermediate rolls 18A, 18B and the backup rolls 20A, 20B are configured to support the rolling mill rolls 16A, 16B.
  • the rolling mill 10 includes a pressing device 22 for pressing the metal strip 50, which is sandwiched by the outside pair of rolling mill rolls 16A, 16B, by applying load to the pair of rolling mill rolls 16A, 16B.
  • the pressing device 22 may include a hydraulic cylinder.
  • a motor 11 is connected to the rolling mill rolls 16A, 16B via a spindle or the like which is not illustrated in the drawing and the rolling mill rolls 16A, 16B are designed to be driven and rotated by the motor 11.
  • a frictional force is generated between the rolling mill rolls 16A, 16B and the metal strip 50 as the motor 11 rotates the rolling mill rolls 16A, 16B while the pressing device 22 presses the metal strip 50; and this frictional force causes the metal strip 50 to be fed towards the exit side of the rolling mill rolls 16A, 16B.
  • the unwinding device 4 is configured to uncoil the metal strip 50 towards the rolling mill 10.
  • the winding device 14 is configured to wind up the metal strip 50 from the rolling mill 10.
  • the unwinding device 4 and the winding device 14 are designed to be driven by motors 5, 15, respectively.
  • the unwinding device 4 is configured to apply entrance-side tension to the metal strip 50 when rolling the metal strip 50.
  • the winding device 14 is configured to apply exit-side tension to the metal strip 50 when rolling the metal strip 50.
  • it is designed to apply the entrance-side tension and the exit-side tension to the metal strip 50 by having the motors 5, 15 drive the unwinding device 4 and the winding device 14 appropriately. It is possible to suppress meandering of the metal strip 50 during the rolling by appropriately applying the entrance-side tension and the exit-side tension to the metal strip 50.
  • the rolling is stopped immediately before a tail end of the metal strip 50 uncoiled from the unwinding device 4; and when the rolling is completed in the state where the metal strip 50 is pressed by the rolling mill rolls 16A, 16B, the metal strip 50 is then uncoiled from the winding device 14 and fed towards the rolling mill 10; and while the unwinding device 4 winds up the metal strip 50, the rolling is performed by making the metal strip 50 advance in an opposite traveling direction to the previous traveling direction.
  • the role of the unwinding device 4 and the role of the winding device 14 are switched to each other depending on the traveling direction of the metal strip 50.
  • the rolling device 2 further includes: an entrance-side pinch roll 6 and a side guide 8 for guiding the metal strip 50 which is introduced from the unwinding device 4 into the rolling mill 10; and an exit-side pinch roll 12 for guiding the metal strip 50 fed from the rolling mill 10 towards the winding device 14.
  • the rolling device 2 is equipped with various kinds of measuring instruments.
  • the rolling device 2 illustrated in FIG. 1 is provided with, for example, speed sensors 32, 36 for measuring speeds of the motors 5, 11, respectively, a tension sensor 34 for measuring the entrance-side tension which acts on the metal strip 50, a pressed position sensor 37 for detecting a position pressed by the rolling mill rolls 16A, 16B, a strip-edge position detector 38 for measuring positions of widthwise strip edges of the metal strip 50 on the exit side of the rolling mill rolls 16A, 16B, and a speed sensor 40 for measuring a speed of the metal strip 50 on the exit side of the rolling mill rolls 16A, 16B. Signals indicating the measurement results of these measuring instruments are designed to be sent to the control device 30.
  • an ammeter for measuring an electric current of the motor 5 to drive the unwinding device 4 may be provided to calculate the entrance-side tension based on the measurement result of the ammeter.
  • the control device 30 may be designed to receive the signals indicating the measurement results from the above-described various types of measuring instruments and control operations of, for example, the motor 11 for driving the rolling mill rolls 16A, 16B, the motor 5 for driving the unwinding device 4, and/or the pressing device 22.
  • the control device 30 may include, for example, a CPU, a memory (RAM), an auxiliary storage unit, and an interface.
  • the control device 30 is designed to receive the signals from the above-described various types of measuring instruments via the interface.
  • the CPU is configured to process the thus-received signals.
  • the CPU is also configured to process programs expanded in the memory.
  • the processing content of the control device 30 may be implemented as programs to be executed by the CPU and stored in the auxiliary storage unit. When executing the programs, these programs are expanded in the memory.
  • the CPU is designed to read the programs from the memory and execute commands included in the programs.
  • control of the rolling device 2 by the above-described control device 30 will be explained.
  • the control of the rolling device 2 which will be explained below is the control performed when starting the rolling of the metal strip 50 which is wound around the unwinding device 4.
  • the rolling device 2 may be operated by manually executing part or whole of the processing by the control device 30 which will be explained below.
  • FIG. 2 is a flowchart illustrating processing by the control device 30 according to one embodiment.
  • FIG. 3 to FIG. 5 is a schematic diagram illustrating a state of the rolling mill rolls 16A, 16B and the metal strip 50 when starting to roll the metal strip 50 under the control of the control device 30.
  • FIG. 6 is a diagram illustrating time changes in a speed (circumferential speed) Vm of the rolling mill rolls 16A, 16B and entrance-side tension Te applied to the metal strip 50 when starting to roll the metal strip 50 under the control of the control device 30.
  • the control device 30 firstly adjusts the position of the pair of rolling mill rolls 16A, 16B so that a gap between the pair of rolling mill rolls 16A, 16B (the gap between the rolls) becomes larger than a strip thickness of the metal strip 50 (step S102).
  • the pressing device 22 may be operated to adjust the position of the pair of rolling mill rolls 16A, 16B as the necessity arises.
  • a tip part 51 see FIG. 3 ) of the metal strip 50 is passed through the pair of rolling mill rolls 16A, 16B (step S104).
  • FIG. 3 is a schematic diagram illustrating the state of the rolling mill rolls 16A, 16B and the metal strip 50 when step S104 is completed.
  • step S104 is completed as illustrated in FIG. 3
  • the tip part 51 of the metal strip 50 has been passed through the pair of rolling mill rolls 16A, 16B in the state where a gap d0 between the pair of rolling mill rolls 16A, 16B is larger than a strip thickness H0 of the metal strip 50 before being rolled.
  • the tip part 51 of the metal strip 50 is positioned on the exit side of the rolling mill rolls 16A, 16B and has not reached the winding device 14, yet. Therefore, exit-side tension Td which acts on the metal strip 50 is zero.
  • the entrance-side tension Te is not caused to act on the metal strip 50, so that the entrance-side tension Te is also zero.
  • step S106 the pair of rolling mill rolls 16A, 16B is used to press the metal strip 50 in the state where the exit-side tension Td applied on the metal strip 50 is zero (step S106; time t0 in FIG. 6 ).
  • step S106 the pressing device 22 is operated based on the measurement result of the pressed position sensor 37 so that the gap between the rolls will become an appropriate value for the rolling.
  • FIG. 4 illustrates a schematic diagram illustrating the state of the rolling mill rolls 16A, 16B and the metal strip 50 when step S108 is completed. A gap d1 between the rolls upon the completion of step S108, as illustrated in FIG. 4 , is smaller than the strip thickness H0 of the metal strip 50 before being rolled.
  • the rolling is started by setting the entrance-side tension Te, which is applied to the metal strip 50 by the unwinding device 4, as larger than zero (step S108; time t1 in FIG. 6 ) and starting the rotation of the pair of rolling mill rolls 16A, 16B (step S110; time t2 in FIG. 6 ).
  • the exit-side tension Td is maintained as zero.
  • step S108 the entrance-side tension Te which acts on the metal strip 50 is set as larger than zero by appropriately adjusting an electric current value of the motor 5 for driving the unwinding device 4.
  • the entrance-side tension Te is set as a specified value Te1 larger than zero; and the specified value Te1 may be maintained as a constant value until the entrance-side tension Te starts increasing in step S114 (time t3 in FIG. 6 ) described later.
  • step S109 the rotation of the rolling mill rolls 16A, 16B is started by appropriately adjusting an electric current value of the motor 11 for driving the rolling mill rolls 16A, 16B.
  • the metal strip 50 advances towards the direction indicated with an arrow in FIG. 4 .
  • FIG. 5 is a schematic diagram illustrating the state of the rolling mill rolls 16A, 16B and the metal strip 50 when the rolling is started in step S110.
  • a portion of the metal strip 50 which is pressed by the rolling mill rolls 16A, 16B and has advanced to the exit side of the rolling mill rolls 16A, 16B has a thinner strip thickness H1 than the strip thickness H0 before being rolled.
  • the metal strip 50 is pressed by the pair of rolling mill rolls 16A, 16B in the state where the exit-side tension Td applied on the metal strip 50 is zero; and the rolling of the metal strip 50 is started by starting the rotation of the rolling mill rolls 16A, 16B while applying the entrance-side tension Te, which is larger than zero, to the metal strip 50.
  • the exit-side tension Td is zero, it is possible to perform the rolling appropriately while suppressing meandering of the metal strip 50. Therefore, it is possible to start the rolling from a portion of the metal strip 50 close to its tip part without using, for example, the lead material as described in Patent Document 1 and improve the yield of the metal strip 50 with the simple configuration.
  • step S110 After starting the rolling by starting the rotation of the rolling mill rolls 16A, 16B in step S110, the speed (roll speed Vm) of the rolling mill rolls 16A, 16B is increased (step S112; time t2 to t4 in FIG. 6 ). Then, the entrance-side tension Te applied to the metal strip 50 is increased at and after time t2 (step S114; time t3 in FIG. 6 ); and the entrance-side tension Te is adjusted so that the entrance-side tension Te will not exceed a specified range (step S116; time t3 to t5 in FIG. 6 ).
  • step S112 the speed (roll speed Vm) of the rolling mill rolls 16A, 16B is increased by appropriately adjusting the electric current value of the motor 11 for driving the rolling mill rolls 16A, 16B.
  • steps S114 and S116 the entrance-side tension Te which acts on the metal strip 50 is increased within a specified range by appropriately adjusting the electric current value of the motor 5 for driving the unwinding device 4.
  • step S114 by increasing the entrance-side tension Te applied to the metal strip 50 (step S114) and making adjustments within an appropriate range so as not to cause slipping (step S116) as described above, it is possible to perform the rolling more appropriately while more effectively suppressing meandering of the metal strip 50 during the rolling in the state of no tension on the exit side.
  • the entrance-side tension Te can be increased stably by increasing the roll speed Vm to a certain degree in step S112 (for example, increasing the roll speed Vm to a roll speed Vm1 which is 40% to 60%, inclusive, of a target roll speed Vm2 [see FIG. 6 ]) and then increasing the entrance-side tension Te in steps S114 to S116 as described above.
  • Step S116 in which the entrance-side tension Te is adjusted not to exceed the specified range is repeatedly executed until the tip part of the metal strip 50 reaches the winding device 14 (No in step S118).
  • the exit-side tension Td becomes larger than zero (Yes in step S118; that is, when the metal strip 50 starts being wound up by the winding device 14)
  • the control according to the flow illustrated in FIG. 2 the flow for performing the rolling appropriately in the state of no tension on the exit side
  • normal control is performed for the case where the exit-side tension Td is larger than zero.
  • step S116 the entrance-side tension Te is adjusted not to exceed the specified range as described above.
  • step S116 the entrance-side tension Te is adjusted so that the exit-side speed Vd of the metal strip 50 becomes equal to or higher than the roll speed (rotational speed) Vm of the rolling mill rolls 16A, 16B.
  • the control device 30 adjusts the electric current value of the motor 5 appropriately on the basis of the exit-side speed Vd measured by the speed sensor 40 and the roll speed Vm calculated from the speed of the motor 11 which is measured by the speed sensor 36 so that the entrance-side tension Te is maintained within an appropriate range.
  • the exit-side speed Vd of the metal strip 50 is lower than the rotational speed Vm of the rolling mill rolls 16A, 16B means that the metal strip 50 on the exit side of the rolling mill rolls 16A, 16B is not advancing towards the rolling mill rolls 16A, 16B (that is, the metal strip 50 is starting to slip, or is likely to slip, along the rolling mill rolls 16A, 16B); and in this case, the rolling may not be sometimes performed appropriately.
  • the above-described embodiment is designed to adjust the entrance-side tension Te applied to the metal strip 50 so that the exit-side speed Vd of the metal strip 50 becomes equal to or higher than the roll speed (rotational speed) Vm of the rolling mill rolls 16A, 16B. So, it is possible to perform the rolling more appropriately while appropriately suppressing slipping (sliding) of the metal strip 50 along the rolling mill rolls 16A, 16B in the state of no tension on the exit side.
  • the rotational speed Vm of the rolling mill rolls 16A, 16B may be measured a specified number of times for every specified period and the entrance-side tension Te applied to the metal strip 50 may be adjusted by using all or some measurement results for the specified number of times so that the exit-side speed Vd of the metal strip 50 becomes equal to or higher than the roll speed (rotational speed) Vm of the rolling mill rolls 16A, 16B.
  • step S116 the exit-side speed Vd of the metal strip 50 measured a plurality of number of times for every specified period is acquired and the entrance-side tension Te is adjusted based on the measurement results of the exit-side speed Vd for the plurality of number of times.
  • the exit-side speed Vd of the metal strip 50 can be an index indicating whether sliding of the metal strip 50 along the rolling mill rolls 16A, 16B will occur or not.
  • the above-described embodiment is designed to measure the exit-side speed Vd of the metal strip 50 the plurality of number of times for every specified period. So, changes in the exit-side speed Vd with the passage of time can be recognized. Therefore, by adjusting the entrance-side tension Te applied to the metal strip 50 on the basis of the measurement results of the exit-side speed Vd for the plurality of number of times, it is possible to perform the rolling appropriately while appropriately suppressing slipping of the metal strip 50 along the rolling mill rolls 16A, 16B in the state of no tension on the exit side.
  • the increase of the entrance-side tension Te is stopped when it is detected that the metal strip 50 is not advancing towards the exit side of the rolling mill rolls 16A, 16B in the state where the exit-side tension Td applied on the metal strip 50 is zero.
  • the metal strip 50 is not advancing towards the exit side of the rolling mill rolls 16A, 16B indicates that the metal strip 50 is starting to slip along the rolling mill rolls 16A, 16B or may possibly slip along the rolling mill rolls 16A, 16B in the near future (a predictor of slipping).
  • the above-described embodiment is designed to stop increasing the entrance-side tension Te when it is detected that the metal strip 50 is not advancing towards the exit side of the rolling mill rolls 16A, 16B. So, it is possible to perform the rolling appropriately while more reliably suppressing slipping of the metal strip 50 along the rolling mill rolls 16A, 16B in the state of no tension on the exit side.
  • an advancement of the metal strip 50 may be measured a specified number of times for every specified period and the fact that the metal strip 50 is not advancing towards the exit side of the rolling mill rolls 16A, 16B may be detected based on all or some measurement results for the specified number of times.
  • the fact that the metal strip 50 is not advancing towards the exit side of the rolling mill rolls 16A, 16B may be detected by, for example, monitoring the metal strip 50 near the rolling mill rolls 16A, 16B by using a camera.
  • the fact that the metal strip 50 is not advancing towards the exit side of the rolling mill rolls 16A, 16B may be detected by, for example, using the exit-side speed Vd measured a specified number of times for every specified period.
  • step S116 the exit-side speed Vd measured the specified number of times for every specified period is acquired; and when all differences between an exit-side speed Vdi measured i-th time and an exit-side speed Vd (i-1) measured (i-1)th time are negative, the metal strip 50 is considered to be not advancing towards the exit side of the rolling mill rolls 16A, 16B and the increase of the entrance-side tension Te is stopped .
  • FIG. 7 is a flowchart of step S116 according to this embodiment.
  • step S116 may be designed so that the above-described exit-side speed Vd measured the specified number of times for every specified period is acquired; and when an integrated value of differences between the exit-side speed Vdi measured i-th time and the exit-side speed Vd (i-1) measured (i-1)th time is less than a specified value, the increase of the entrance-side tension Te is stopped by recognizing that the metal strip 50 is not advancing towards the exit side of the rolling mill rolls 16A, 16B.
  • FIG. 8 is a flowchart of step S116 according to this embodiment.
  • the possibility that slipping may occur in the near future can be found based on the difference between the exit-side speed Vd i measured i-th time and the exit-side speed Vd (i-1) measured (i-1)th time or the integrated value of the differences between the exit-side speed Vd i measured i-th time and the exit-side speed Vd (i-1) measured (i-1)th time; and it is designed to stop increasing the entrance-side tension Te when the above-described possibility is high. So, it is possible to perform the rolling appropriately while more reliably suppressing slipping of the metal strip 50 along the rolling mill rolls 16A, 16B in the state of no tension on the exit side.
  • the embodiment illustrated in FIG. 7 and FIG. 8 is designed to perform the control relating to the adjustment of the entrance-side tension Te by using the exit-side speed Vd measured the specified number of times for every specified period; however, other embodiments may be designed to perform the control relating to the adjustment of the entrance-side tension Te by using the exit-side speed Vd measured for a specified length of time for every specified period.
  • Some embodiments are configured so that the exit-side speed Vd of the metal strip 50 and the roll speed Vm which is the circumferential speed of the rolling mill rolls 16A, 16B are acquired and the entrance-side tension Te is adjusted based on the difference (Vd-Vm) between the exit-side speed Vd of the metal strip 50 and the roll speed Vm.
  • the difference (Vd-Vm) between the exit-side speed Vd of the metal strip 50 and the roll speed Vm can be an index indicating whether sliding of the metal strip 50 along the rolling mill rolls 16A, 16B will occur or not.
  • the above-described embodiment is designed so that the entrance-side tension Te applied to the metal strip 50 is adjusted based on the difference (Vd-Vm) between the exit-side speed Vd of the metal strip 50 and the roll speed Vm; and it is thereby possible to perform the rolling appropriately while appropriately suppressing slipping of the metal strip 50 along the rolling mill rolls 16A, 16B in the state of no tension on the exit side.
  • Some embodiments may be configured to decrease the entrance-side tension Te by a specified amount after stopping increasing the entrance-side tension Te (for example, after step S116 in FIG. 2 or steps S212, S232 in FIG. 7 and FIG. 8 ).
  • FIG. 7 and FIG. 8 are designed to decrease the entrance-side tension Te by the specified amount (step S214 or S234) after stopping increasing the entrance-side tension Te in step S212 or S232.
  • the above-described configuration (1) is designed so that after passing the tip part of the metal strip through the pair of rolling mill rolls, the metal strip is pressed by the pair of rolling mill rolls in the state where the exit-side tension applied to the metal strip is zero; and rolling of the metal strip is started by starting the rotation of the rolling mill rolls while applying the entrance-side tension larger than zero to the metal strip. So, even though the exit-side tension is zero, the metal strip can be rolled appropriately while suppressing meandering of the metal strip. Therefore, it is possible to start the rolling from a portion of the metal strip close to its tip part without using the lead material of the like and improve the yield of the metal strip with the simple configuration.
  • control device is configured to increase the entrance-side tension within a specified range after starting the rotation of the rolling mill rolls in the state where the exit-side tension applied to the metal strip is zero.
  • the entrance-side tension is increased within the specified range in the state where the exit-side tension applied to the metal strip is zero. So, it is possible to perform the rolling more appropriately while suppressing meandering of the metal strip more effectively during the rolling in the state of no tension on the exit side.
  • control device is configured to adjust the entrance-side tension so that an exit-side speed Vd of the metal strip becomes equal to or higher than a rotational speed Vm of the rolling mill rolls.
  • the fact that the exit-side speed Vd of the metal strip is lower than the rotational speed Vm of the rolling mill rolls means that the metal strip on the exit side of the rolling mill rolls is not advancing relative to the rolling mill rolls (that is, the metal strip is starting slipping, or is likely to slip, along the rolling mill rolls); and in this case, it is sometimes impossible to perform the rolling appropriately.
  • the above-described configuration (3) is designed so that the entrance-side tension applied to the metal strip is adjusted so that the exit-side speed Vd of the metal strip becomes equal to or higher than the rotational speed Vm of the rolling mill rolls. So, it is possible to perform the rolling more appropriately while appropriately suppressing slipping (sliding) of the metal strip along the rolling mill rolls in the state of no tension on the exit side.
  • control device is configured to: acquire the exit-side speed Vd of the metal strip which is measured a plurality of number of times for every specified period; and adjust the entrance-side tension based on a result of the measurement of the exit-side speed Vd conducted the plurality of number of times.
  • the exit-side speed Vd of the metal strip can be an index indicating whether sliding of the metal strip along the rolling mill rolls will occur or not.
  • the above-described configuration (4) is designed so that the exit-side speed Vd of the metal strip is measured the plurality of number of times for every specified period and, therefore, changes in the exit-side speed Vd with the passage of time can be recognized. Accordingly, by adjusting the entrance-side tension applied to the metal strip on the basis of the measurement results of the exit-side speed Vd for the plurality of number of times, it is possible to perform the rolling appropriately while appropriately suppressing slipping of the metal strip along the rolling mill rolls in the state of no tension on the exit side.
  • control device is configured to stop increasing the entrance-side tension when it is detected that the metal strip is not advancing towards an exit side of the rolling mill rolls in the state where the exit-side tension applied to the metal strip is zero.
  • the metal strip is not advancing towards the exit side of the rolling mill rolls indicates that the metal strip is starting to slip along the rolling mill rolls or may possibly slip along the rolling mill rolls in the near future (a predictor of slipping).
  • the above-described configuration (5) is designed to stop increasing the entrance-side tension when it is detected the metal strip is not advancing towards the exit side of the rolling mill rolls. So, it is possible to perform the rolling appropriately while more reliably suppressing slipping of the metal strip along the rolling mill rolls in the state of no tension on the exit side.
  • control device is configured to: acquire the exit-side speed Vd measured a specified number of times for every specified period; and stop increasing the entrance-side tension when all differences between an exit-side speed Vd i measured i-th time and an exit-side speed Vd (i-1) measured (i-1)th time are negative.
  • the above-described configuration (6) is designed to stop increasing the entrance-side tension when all differences between the exit-side speed Vd i measured i-th time and the exit-side speed Vd (i-1) measured (i-1)th time are negative, that is, when the exit-side speed Vd is gradually decreasing while measuring the exit-side speed Vd the specified number of times for every specified period and there is a high possibility that slipping may occur in the near future. So, it is possible to perform the rolling appropriately while more reliably suppressing slipping of the metal strip along the rolling mill rolls in the state of no tension on the exit side.
  • the control device is configured to: acquire the exit-side speed Vd measured a specified number of times for every specified period; and stop increasing the entrance-side tension when an integrated value of differences between an exit-side speed Vd i measured i-th time and an exit-side speed Vd (i-1) measured (i-1)th time is less than a specified value.
  • the above-described configuration (7) is designed to stop increasing the entrance-side tension when the integrated value of differences between the exit-side speed Vd i measured i-th time and an exit-side speed Vd (i-1) measured (i-1)th time is less than the specified value, that is, when the exit-side speed Vd is gradually decreasing while measuring the exit-side speed Vd the specified number of times for every specified period and there is a high possibility that slipping may occur in the near future. So, it is possible to perform the rolling appropriately while more reliably suppressing slipping of the metal strip along the rolling mill rolls in the state of no tension on the exit side.
  • control device is configured to decrease the entrance-side tension by a specified amount after stopping increasing the entrance-side tension.
  • the above-described configuration (8) is designed to decrease the entrance-side tension by the specified amount after stopping increasing the entrance-side tension in order to suppress slipping. So, it is possible to perform the rolling appropriately while further reliably suppressing slipping of the metal strip along the rolling mill rolls in the state of no tension on the exit side.
  • control device is configured to: acquire the exit-side speed Vd of the metal strip and a roll speed Vm which is a circumferential speed of the rolling mill rolls; and adjust the entrance-side tension based on a difference (Vd-Vm) between the exit-side speed Vd of the metal strip and the roll speed Vm.
  • the difference (Vd-Vm) between the exit-side speed Vd of the metal strip and the roll speed Vm can be an index indicating whether sliding of the metal strip along the rolling mill rolls will occur or not.
  • the above-described configuration (9) is designed so that by adjusting the entrance-side tension applied to the metal strip on the basis of the difference (Vd-Vm) between the exit-side speed Vd of the metal strip and the roll speed Vm, it is possible to perform the rolling appropriately while suppressing slipping of the metal strip along the rolling mill rolls appropriately in the state of no tension on the exit side.
  • Rolling equipment includes:
  • the above-described configuration (10) is designed so that after passing the tip part of the metal strip through the pair of rolling mill rolls, the metal strip is pressed by the pair of rolling mill rolls in the state where the exit-side tension applied to the metal strip is zero; and the rotation of the rolling mill rolls is started while applying the entrance-side tension, which is larger than zero, to the metal strip, thereby starting to roll the metal strip. So, even though the exit-side tension is zero, it is possible to perform the rolling appropriately while suppressing meandering of the metal strip. Therefore, it is possible to start the rolling from a portion of the metal strip close to its tip part without using the lead material of the like and improve the yield of the metal strip with the simple configuration.
  • a rolling device operation method is a method for operating a rolling device which includes an unwinding device for applying entrance-side tension to a metal strip and a pair of rolling mill rolls provided to sandwich the metal strip at an exit side of the unwinding device in a traveling direction of the metal strip and which is configured to roll the metal strip by the pair of rolling mill rolls, wherein the rolling device operating method includes:
  • the above-described method (11) is designed so that after passing the tip part of the metal strip through the pair of rolling mill rolls, the metal strip is pressed by the pair of rolling mill rolls in the state where the exit-side tension applied to the metal strip is zero; and the rotation of the rolling mill rolls is started while applying the entrance-side tension, which is larger than zero, to the metal strip, thereby starting to roll the metal strip. So, even though the exit-side tension is zero, it is possible to perform the rolling appropriately while suppressing meandering of the metal strip. Therefore, it is possible to start the rolling from a portion of the metal strip close to its tip part without using the lead material of the like and improve the yield of the metal strip with the simple configuration.
  • the entrance-side tension is increased within a specified range after the roll start step in the state where the exit-side tension applied to the metal strip is zero.
  • the above-described method (12) is designed so that after starting the rotation of the rolling mill rolls, the entrance-side tension is increased within the specified range in the state where the exit-side tension applied to the metal strip is zero. So, it is possible to perform the rolling more appropriately by more effectively suppressing meandering of the metal strip during the rolling in the state of no tension on the exit side.
  • the entrance-side tension is adjusted so that an exit-side speed Vd of the metal strip becomes equal to or higher than a rotational speed Vm of the rolling mill rolls.
  • the exit-side speed Vd of the metal strip is lower than the rotational speed Vm of the rolling mill rolls means that the metal strip on the exit side of the rolling mill rolls is not advancing relative to the rolling mill rolls; and in this case, it may sometimes be impossible to perform the rolling appropriately.
  • the above-described method (13) is designed to adjust the entrance-side tension applied to the metal strip so that the exit-side speed Vd of the metal strip becomes equal to or higher than the rotational speed Vm of the rolling mill rolls. So, it is possible to perform the rolling appropriately while appropriately suppressing slipping (sliding) of the metal strip along the rolling mill rolls in the state of no tension on the exit side. in the state of no tension on the exit side.
  • the exit-side speed Vd of the metal strip which is measured a plurality of number of times for every specified period is acquired and the entrance-side tension is adjusted based on a result of the measurement of the exit-side speed Vd conducted the plurality of number of times.
  • the exit-side speed Vd of the metal strip can be an index indicating whether sliding of the metal strip along the rolling mill rolls will occur or not.
  • the above-described method (14) is designed so that the exit-side speed Vd of the metal strip is measured the plurality of number of times for every specified period and, therefore, changes in the exit-side speed Vd with the passage of time can be recognized. Accordingly, by adjusting the entrance-side tension applied to the metal strip on the basis of the measurement results of the exit-side speed Vd conducted the plurality of number of times, it is possible to perform the rolling appropriately while suppressing slipping of the metal strip along the rolling mill rolls appropriately in the state of no tension on the exit side.
  • the increase of the entrance-side tension is stopped when it is detected that the metal strip is not advancing towards an exit side of the rolling mill rolls in the state where the exit-side tension applied to the metal strip is zero.
  • the metal strip is not advancing towards the exit side of the rolling mill rolls indicates that the metal strip is starting to slip along the rolling mill rolls or may possibly slip along the rolling mill rolls in the near future (a predictor of slipping).
  • the above-described method (15) is designed to stop increasing the entrance-side tension when it is detected the metal strip is not advancing towards the exit side of the rolling mill rolls. So, it is possible to perform the rolling appropriately while more reliably suppressing slipping of the metal strip along the rolling mill rolls in the state of no tension on the exit side.
  • the exit-side speed Vd measured a specified number of times for every specified period is acquired; and the increase of the entrance-side tension is stopped when all differences between an exit-side speed Vd i measured i-th time and an exit-side speed Vd (i-1) measured (i-1)th time are negative.
  • the above-described method (16) is designed to stop increasing the entrance-side tension when all the differences between the exit-side speed Vd i measured i-th time and the exit-side speed Vd (i-1) measured (i-1)th time are negative, that is, when the exit-side speed Vd is gradually decreasing while measuring the exit-side speed Vd the specified number of times for every specified period and there is a high possibility that slipping may occur in the near future. So, it is possible to perform the rolling appropriately while more reliably suppressing slipping of the metal strip along the rolling mill rolls in the state of no tension on the exit side.
  • the exit-side speed Vd measured a specified number of times for every specified period is acquired; and the increase of the entrance-side tension is stopped when an integrated value of differences between an exit-side speed Vd i measured i-th time and an exit-side speed Vd (i-1) measured (i-1)th time is less than a specified value.
  • the above-described method (17) is designed to stop increasing the entrance-side tension when the integrated value of the differences between the exit-side speed Vd i measured i-th time and the exit-side speed Vd (i-1) measured (i-1)th time is less than the specified value, that is, when the exit-side speed Vd is gradually decreasing while measuring the exit-side speed Vd the specified number of times for every specified period and there is a high possibility that slipping may occur in the near future. So, it is possible to perform the rolling appropriately while more reliably suppressing slipping of the metal strip along the rolling mill rolls in the state of no tension on the exit side.
  • the entrance-side tension is decreased by a specified amount after stopping increasing the entrance-side tension.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)
  • Winding, Rewinding, Material Storage Devices (AREA)

Claims (14)

  1. Équipement de laminage incluant :
    un dispositif (2) de laminage comprenant une paire de cylindres (16A, 16B) de laminoir prévus pour prendre en sandwich une bande métallique (50) et un dispositif (4) de débobinage pour dérouler la bande métallique au niveau d'un côté d'entrée des cylindres de laminoir dans un sens de déplacement de la bande métallique, le dispositif de laminage étant configuré pour laminer la bande métallique par la paire de cylindres de laminoir, et
    un dispositif (30) de commande pour commander le dispositif de laminage ;
    caractérisé en ce que
    après le passage d'une partie d'extrémité de la bande métallique à travers la paire de cylindres de laminoir dans un état où un espace entre la paire de cylindres de laminoir est plus grand qu'une épaisseur de bande de la bande métallique, le dispositif de commande est configuré pour :
    presser la bande métallique par la paire de cylindres de laminoir dans un état où une tension côté sortie appliquée à la bande métallique est zéro ;
    amener la tension côté entrée appliquée à la bande métallique par le dispositif de débobinage à devenir supérieure à zéro ; et
    démarrer la rotation de la paire de cylindres de laminoir.
  2. Équipement de laminage selon la revendication 1,
    dans lequel le dispositif (30) de commande est configuré pour augmenter la tension côté entrée à l'intérieur d'une plage spécifiée après le démarrage de la rotation des cylindres (16A, 16B) de laminoir dans l'état où la tension côté sortie appliquée à la bande métallique est zéro.
  3. Équipement de laminage selon la revendication 2,
    dans lequel le dispositif (30) de commande est configuré pour ajuster la tension côté entrée de manière à ce qu'une vitesse côté sortie Vd de la bande métallique (50) devienne égale ou supérieure à une vitesse de rotation Vm des cylindres (16A, 16B) de laminoir.
  4. Équipement de laminage selon la revendication 2 ou 3,
    dans lequel le dispositif (30) de commande est configuré pour : acquérir la vitesse côté sortie Vd de la bande métallique (50) qui est mesurée une pluralité de nombre de fois pour chaque période spécifiée ; et ajuster la tension côté entrée sur la base d'un résultat de la mesure de la vitesse côté sortie Vd effectuée la pluralité de nombre de fois.
  5. Équipement de laminage selon l'une quelconque des revendications 2 à 4,
    dans lequel le dispositif (30) de commande est configuré pour arrêter d'augmenter la tension côté entrée lorsqu'il est détecté que la bande métallique (50) n'avance pas vers un côté sortie des cylindres (16A, 16B) de laminoir dans l'état où la tension côté sortie appliquée à la bande métallique est zéro.
  6. Équipement de laminage selon la revendication 4 ou 5,
    dans lequel le dispositif (30) de commande est configuré pour : acquérir la vitesse côté sortie Vd mesurée un nombre spécifié de fois pour chaque période spécifiée ; et arrêter d'augmenter la tension côté entrée lorsque toutes les différences entre une vitesse côté sortie Vdi mesurée une iième fois et une vitesse côté sortie Vd(i-1) mesurée une (i-1)ième fois sont négatives.
  7. Équipement de laminage selon la revendication 4 ou 5,
    dans lequel le dispositif (30) de commande est configuré pour : acquérir la vitesse côté sortie Vd mesurée un nombre spécifié de fois pour chaque période spécifiée ; et arrêter d'augmenter la tension côté entrée lorsqu'une valeur intégrée de différences entre une vitesse côté sortie Vdi mesurée une iième fois et une vitesse côté sortie Vd(i-1) mesurée une (i-1)ième fois est inférieure à une valeur spécifiée.
  8. Équipement de laminage selon l'une quelconque des revendications 5 à 7,
    dans lequel le dispositif (30) de commande est configuré pour diminuer la tension côté entrée d'une quantité spécifiée après avoir arrêté d'augmenter la tension côté entrée.
  9. Équipement de laminage selon l'une quelconque des revendications 2 à 5,
    dans lequel le dispositif (30) de commande est configuré pour : acquérir la vitesse côté sortie Vd de la bande métallique (50) et une vitesse de cylindres Vm qui est une vitesse circonférentielle des cylindres (16A, 16B) de laminoir; et ajuster la tension côté entrée sur la base d'une différence (Vd-Vm) entre la vitesse côté sortie Vd de la bande métallique et la vitesse de cylindres Vm.
  10. Procédé de fonctionnement d'un dispositif de laminage incluant un dispositif (4) de débobinage pour appliquer une tension côté entrée à une bande métallique (50) et une paire de cylindres (16A, 16B) de laminoir prévus pour prendre en sandwich la bande métallique au niveau d'un côté sortie du dispositif de débobinage dans un sens de déplacement de la bande métallique, le dispositif de laminage étant configuré pour laminer la bande métallique par la paire de cylindres de laminoir,
    le procédé de fonctionnement de dispositif de laminage comprenant :
    une étape (S104) de passage de bande pour faire passer une partie d'extrémité de la bande métallique à travers la paire de cylindres de laminoir dans un état où un espace entre la paire de cylindres de laminoir est supérieur à une épaisseur de bande de la bande métallique ;
    le procédé caractérisé par les étapes consécutives suivantes :
    une étape (S106) de pressage pour amener la paire de cylindres de laminoir à presser la bande métallique après l'étape de passage de bande dans un état où la tension côté sortie appliquée à la bande métallique est zéro ;
    une étape (S108) d'application de tension pour amener le dispositif de débobinage à amener la tension côté entrée appliquée à la bande métallique à devenir supérieure à zéro après l'étape de pressage dans l'état où la tension côté sortie appliquée à la bande métallique est zéro ; et
    une étape (S110) de démarrage de cylindres pour démarrer la rotation de la paire de cylindres de laminoir après l'étape d'application de tension dans l'état où la tension côté sortie appliquée à la bande métallique est zéro.
  11. Procédé de fonctionnement de dispositif de laminage selon la revendication 10,
    dans lequel la tension côté entrée est augmentée (S112) à l'intérieur d'une plage spécifiée après l'étape (S110) de démarrage de cylindres dans l'état où la tension côté sortie appliquée à la bande métallique (50) est zéro.
  12. Procédé de fonctionnement de dispositif de laminage selon la revendication 11,
    dans lequel la tension côté entrée est ajustée (S116) de manière à ce qu'une vitesse côté sortie Vd de la bande métallique (50) devient égale ou supérieure à une vitesse de rotation Vm des cylindres (16A, 16B) de laminoir.
  13. Procédé de fonctionnement de dispositif de laminage selon la revendication 11 ou 12,
    dans lequel la vitesse côté sortie Vd de la bande métallique (50) qui est mesurée une pluralité de nombre de fois pour chaque période spécifiée est acquise et la tension côté entrée est ajustée (S116) sur la base d'un résultat de la mesure de la vitesse côté sortie Vd effectuée la pluralité de nombre de fois.
  14. Procédé de fonctionnement de dispositif de laminage selon l'une quelconque des revendications 11 à 13,
    dans lequel l'augmentation de la tension côté entrée est arrêtée lorsqu'il est détecté que la bande métallique (50) n'avance pas vers un côté sortie des cylindres (16A, 16B) de laminoir dans l'état où la tension côté sortie appliquée à la bande métallique est zéro.
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EP4257256A4 (fr) * 2020-12-07 2024-05-22 JFE Steel Corporation Procédé de laminage à froid et procédé de production de tôle d'acier laminée à froid
JP7727001B2 (ja) * 2021-09-24 2025-08-20 Ｐｒｉｍｅｔａｌｓ Ｔｅｃｈｎｏｌｏｇｉｅｓ Ｊａｐａｎ株式会社 圧延装置の制御装置、圧延設備及び圧延装置の制御方法
WO2025224989A1 (fr) * 2024-04-26 2025-10-30 Ｐｒｉｍｅｔａｌｓ Ｔｅｃｈｎｏｌｏｇｉｅｓ Ｊａｐａｎ株式会社 Dispositif de commande pour dispositif de laminage, équipement de laminage et procédé de fonctionnement de dispositif de laminage
WO2025224991A1 (fr) * 2024-04-26 2025-10-30 Ｐｒｉｍｅｔａｌｓ Ｔｅｃｈｎｏｌｏｇｉｅｓ Ｊａｐａｎ株式会社 Dispositif de commande de dispositif de laminage, équipement de laminage et procédé de fonctionnement de dispositif de laminage

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JP2006334647A (ja) 2005-06-03 2006-12-14 Jp Steel Plantech Co 圧延方法および圧延設備
CN104785532A (zh) 2015-04-01 2015-07-22 山东钢铁股份有限公司 一种穿带控制方法及装置
CN107052049A (zh) 2017-06-13 2017-08-18 浙江协和陶瓷有限公司 冷轧带钢加工工艺

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CN112334243A (zh) 2021-02-05
EP3715002A4 (fr) 2020-09-30
EP3715002A1 (fr) 2020-09-30
CN112334243B (zh) 2022-09-13
JP7119130B2 (ja) 2022-08-16
JPWO2020157819A1 (ja) 2021-10-07
EP3715002B2 (fr) 2024-10-30

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