| 摘要 |
PROBLEM TO BE SOLVED: To prevent the generation of camber of a rolled stock by preventing the generation of circumferential speed difference between upper and lower rolls in a method for controlling the speed of an upper and lower rolls individually driving type rolling mill. SOLUTION: In the upper and lower rolls individually driving type rolling mill, the currents respective motors 3, 4 for driving the upper and lower rolls 1, 2 in a state where the upper and lower rolls 1, 2 are brought into contact by applying load after completing speed setting are detected and, when the current difference exceeds a dead band, the setting of the circumferential speed of roll is changed in the direction in which the current difference is eliminated and the circumferential speed difference between the upper and lower rolls 1, 2 before the rolled stock is bitten with the rolling mill. |
