US 12,330,198 B2
Rolling mills and rolling methods
Tatsunori Sugimoto, Hiroshima (JP); Kenji Horii, Hiroshima (JP); Akio Kuroda, Hiroshima (JP); Akira Sako, Hiroshima (JP); and Shinya Kanemori, Tokyo (JP)
Assigned to PRIMETALS TECHNOLOGIES JAPAN, LTD., Hiroshima (JP)
Appl. No. 17/914,776
Filed by PRIMETALS TECHNOLOGIES JAPAN, LTD., Hiroshima (JP)
PCT Filed Apr. 17, 2020, PCT No. PCT/JP2020/016934
§ 371(c)(1), (2) Date Sep. 27, 2022,
PCT Pub. No. WO2021/210175, PCT Pub. Date Oct. 21, 2021.
Prior Publication US 2023/0330729 A1, Oct. 19, 2023
Int. Cl. B21B 37/68 (2006.01); B21B 1/22 (2006.01); B21B 38/00 (2006.01); B21B 38/04 (2006.01); B21B 38/06 (2006.01); B21B 39/16 (2006.01); B21D 5/14 (2006.01); G01B 11/02 (2006.01)
CPC B21B 37/68 (2013.01) [B21B 1/22 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A rolling mill comprising:
a pair of upper and lower work rolls;
roll chocks that rotatably support the work rolls;
a plurality of pressing devices provided on an entry side and an exit side of the roll chocks in a rolling direction, and the plurality of pressing devices being provided on a work side and a drive side, wherein the plurality of pressing devices are configured to be capable of changing positions of the roll chocks in the rolling direction, and measuring first pressing forces on the roll chocks; and
a control device that drives the pressing devices, and controls the positions of the roll chocks, the control device being configured to:
obtain second pressing forces acting on the roll chocks on the work side and the drive side on a basis of the first pressing forces on the entry side and the exit side, and
drive-control at least one of the plurality of pressing devices changing a position of a roll chock of at least one of the pair of upper and lower work rolls in such a manner that a difference between the second pressing force on the work side and the second pressing force on the drive side is equal to or smaller than a predetermined value; and
a tension information acquiring device that acquires information about a tension applied to a rolled material on the exit side of the work rolls,
wherein the control device is configured to:
obtain a tension distribution in a widthwise direction of the rolled material on a basis of the information, and
control the pressing device on a basis of the tension distribution while the difference is greater than a predetermined value.
 
7. A method of controlling a rolling mill; the rolling mill including
a pair of upper and lower work rolls;
roll chocks that rotatably support the work rolls;
a plurality of pressing devices provided on an entry side and an exit side of the roll chocks in a rolling direction, and the plurality of pressing devices being provided on a work side and a drive side, wherein the plurality of pressing devices are configured to be capable of changing positions of the roll chocks in the rolling direction, and measuring first pressing forces on the roll chocks; and
a control device that drives the pressing devices, and controls the positions of the roll chocks, the method comprising:
a pressing force measurement step of measuring the first pressing forces on the roll chocks;
a pressing force calculation step of obtaining second pressing forces acting on the roll chocks on the work side and the drive side on a basis of the first pressing forces on the entry side and the exit side;
a difference calculation step of obtaining a difference between the second pressing force on the work side and the second pressing force on the drive side;
a press control step of drive-controlling at least one of the plurality of pressing devices changing a position of a roll chock of at least one of the pair of upper and lower work rolls in such a manner that the difference is equal to or smaller than a predetermined value;
a tension information acquisition step of acquiring information about a tension applied to a rolled material on the exit side of the work rolls; and
a tension distribution calculation step of obtaining a tension distribution in a widthwise direction of the rolled material on a basis of the information,
wherein at the press control step, the pressing device is controlled on a basis of the tension distribution while the difference is greater than a predetermined value.