METHOD FOR CONTROLLING INTERSTAND TENSION AT FLYING THICKNESS CHANGE IN COLD-ROLLING MILL

摘要

PPROBLEM TO BE SOLVED: To provide a method of controlling interstand tension at flying thickness change in a cold-rolling mill by which the variation of interstand tension caused by roll-gap control is rapidly converged and troubles caused by the variation of the tension are reduced even when the rolling mill is rolling down with electric motors. PSOLUTION: When performing the flying thickness change in a tandem cold-rolling mill, the roll gap setting action at the stands on and after the second stand acts in the direction of the action at the same time when the flying thickness change is started by setting only the direction of the action and, when or just before the interstand tension of the succeeding steel sheet on the inlet side of the stand reaches the target value, the roll gap setting action is stopped and shifted to ordinary tension control. Furthermore, it is preferable to turn off the tension control during the roll gap setting action. PCOPYRIGHT: (C)2007,JPO&INPIT