METHOD FOR CONTROLLING SHEET WIDTH, METHOD FOR PRODUCING COLD-ROLLED METAL SHEET AND COLD-ROLLING APPARATUS

PROBLEM TO BE SOLVED: To restrain the variation of a sheet width after rolling even when a rolling speed is changed. SOLUTION: The variation of a sheet crown rate for keeping the variation of the sheet width at the corresponding rolling speed constant is calculated on the basis of a relationship between the variation of the sheet crown rate and the variation of the sheet width of the rolled sheet corresponding to the rolling speed. The roll gap of working rolls in a stand is adjusted by controlling the correcting amount of a bending force of the work roll so as to match it to this calculated variation of the sheet crown ratio. The variation of the sheet width after rolling is restrained by rolling the sheet to be rolled with the work rolls adjusted in such a way. COPYRIGHT: (C)2004,JPO