ROLLING METHOD FOR STRIP TO BE ROLLED HAVING WIDTH CHANGE POINT BY WORK ROLL MOVING TYPE ROLLING MILL

摘要

PURPOSE:To efficiently change a strip width without interrupting a rolling operation by moving the relative positions of work rolls having a convergent shape at one end in the directions opposite from each other relative to an axial line direction in the axial line direction. CONSTITUTION:A working fluid is fed from a hydraulic unit 6 into a moving cylinder 4 in a moving device by changing over a selector valve 5 for a narrow width direction and broad width direction in accordance with the signal of a computer 7 for commanding the movement at the time when the width change point of a material 3 to be rolled passes a four high mill. The upper and lower work rolls 2 which are tapered on one side are moved in the directions opposite from each other by such control. The movement is completed before the width change point passes the rolling mill. Not only the rolling efficiency but also the quality are improved by the above-mentioned method.