JPS55120407A - Controlling method for shape in six-stage rolling mill - Google Patents

Abstract

PURPOSE: To make possible the effective straightening for the edge wave and center buckle or the pocket type shape defect, by performing the control of the roll bending force together with the axial shift of the intermediate roll, depending on the output of the shape detector on the delivery side of the rolling mill during the rolling work.

CONSTITUTION: In the six-stage rolling mill like as the final stand, etc., of the tandem mill, if the shape detector installed on the delivery side of the rolling mill detects that the edge wave and the center buckle exceeded the aim shape, the roll bending force of the work roll is first increased. Hereby, the edge wave partly decreases, and the center buckle a little increases on the contrary. At the next timing, if the intermediate roll is shifted in the direction to reduce the position of the drum end, the center buckle decreases and the edge wave a little increases. By repeating this procedure, the edge wave together with the center buckle finally get the aim shape. Against the pocket type shape defect, first the roll bending force is lowered, and next, the intermediate roll is shifted in the direction to increase the position of the drum end so as to increase the elongation of the rolled material at the middle zone.

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