METHOD FOR CONTROLLING PLATE THICKNESS IN WIDTH DIRECTION OF PLATE MATERIAL

摘要

PROBLEM TO BE SOLVED: To execute the rolling giving a good plate thickness distribution by correcting a crossing angle of work rolls based on a deviation between the plate thicknesses at the center of the plate width and at first evaluating points and correcting shifting quantity of the work rolls based on a deviation between the plate thicknesses at the first evaluating point and second evaluating points. SOLUTION: The first evaluating points are set to positions at a prescribed distance from the center of the plate width and further, the second evaluating points are set to positions on the edge part sides at a prescribed distance from the first evaluating points as the position contriving the effect of improvement to the deviation of the plate thicknesses (edge drop) caused by the roll shift. The first evaluating points are located at the positions correctable of the plate thickness profile with the roll crossing to contrive the improvement to the deviation between the plate thicknesses at the center of the plate width generally called as a body crown and at the positions of e.g. 100mm from the plate edges. On the other hand, the second evaluating points are located at the plate edge side from the first evaluating points and are located at the positions correctable of the plate thickness profile with the roll shift to contrive the improvement to the deviation between the plate thicknesses at the positions of e.g. 100mm from the plate edges and at the positions of 10mm to about 30mm from the plate edges.