US 12,434,283 B2
Hot rolling mills and hot 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. 17/914,779
Filed by PRIMETALS TECHNOLOGIES JAPAN, LTD., Hiroshima (JP)
PCT Filed Apr. 27, 2020, PCT No. PCT/JP2020/018022
§ 371(c)(1), (2) Date Sep. 27, 2022,
PCT Pub. No. WO2021/220367, PCT Pub. Date Nov. 4, 2021.
Prior Publication US 2023/0139351 A1, May 4, 2023
Int. Cl. B21B 13/02 (2006.01); B21B 1/26 (2006.01); B21B 13/14 (2006.01)
CPC B21B 1/26 (2013.01) [B21B 13/02 (2013.01); B21B 2013/025 (2013.01); B21B 13/14 (2013.01); B21B 2269/04 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A hot rolling mill comprising:
a pair of upper and lower work rolls;
a pair of upper and lower backup rolls that support the work rolls;
bending actuators that apply bending forces to the work rolls;
work-roll horizontal actuators that move the work rolls in a horizontal direction;
backup-roll horizontal actuators that move the backup rolls in the horizontal direction; and
an angle control apparatus configured to adjust an angle formed between an upper-side pair of the upper backup roll and the upper work roll and a lower-side pair of the lower backup roll and the lower work roll in a state where the upper-side pair is kept parallel and in a state where the lower-side pair is kept parallel using the work-roll horizontal actuator and the backup-roll horizontal actuator,
wherein the work rolls satisfy a condition that DW/Lb is equal to or smaller than 0.30 where DW is a diameter of the work rolls, and Lb is a maximum strip width of a rolled material.