PURPOSE: To rapidly reduce the late thickness, i.e., reduce the edge drop in the vicinity of the width side end part of the rolled plate by operating the crown shape control device and/or the plate crown schedule in the rear step of a finishing mill so as to control the crown shape to be shifted more toward the tensile side.
CONSTITUTION: A plate crown schedule in a series of continuous hot rolling mill train calculate the allowable range of the plate shape where no rolling operation is disturbed at the respective stands from the target crown of the rough rolling outlet side and the final stand outlet side, and then, select in general the center within the allowable range and the rolling schedule (b) taking into consideration the safety of the rolling operation. But the plate crown schedule (a) executing the rolling of center buckle side in the later step of the finishing mill is selected in the allowable range of plate shape where no rolling operation is disturbed. Rolling by operating the crown control devices of the respective stands in accordance with the plate crown schedule allows the rolled plate to be controlled to the target crown on the final stand outlet side, and the edge drop to be reduced.
YAMADA KENJI
OGAWA SHIGERU
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