METHOD FOR CONTROLLING WIDTH OF MATERIAL TO BE ROLLED IN FINISH HOT ROLLING LINE

摘要

PURPOSE: To mitigate control range and to enable exact width control by arranging a vertical mill between mutual stands of a finish hot rolling mill, detecting the state of fluctuation in the width of a material to be rolled and adjusting tension between mutual stands in a width detecting region based on it. ;CONSTITUTION: The state of fluctuation in the breadthwise direction of the material S to be rolled by utilizing an edger mill 3 which is arranged between the mutual stands of the finish hot rolling line 1-1, etc., is grasped and the fluctuation of width is reduced by changing the tension between the mutual stands. To ascertain the state of fluctuation in the width of the material S to be rolled in the edger mill 3, the opening degree of roll of the edger mill 3 is preliminarily set at a prescribed value and the region of especially large fluctuation in the rolling load of this edger mill 3 is detected. And, tension between the stands is changed based on obtained information. In this way, a hot strip of which the fluctuation of width is extremely small and quality is good can be obtained.;COPYRIGHT: (C)1993,JPO&Japio