METHOD OF CONTROLLING SHAPE IN PLATE ROLLING MILL IN COLD-ROLLING

摘要

PROBLEM TO BE SOLVED: To provide a method of controlling the shape in a plate rolling mill in cold-rolling by which the defective plate shape caused by a fluctuation in rolling load, especially the defective plate shape at acceleration and deceleration and the defective plate shape in skid-mark parts are finely controlled.

SOLUTION: The plate shape (shape evaluation parameterλ2) is estimated from the changeβof a measured mechanical plate crown ratio and linear load p; the deviationΔλ2of the shape evaluation parameterλ2is calculated from the deviationΔβof the changeβof the mechanical plate crown ratio and the deviationΔp of the change of the line load from the reference state; the controlled variable of work-roll bender force which offsets the shape evaluation parameter deviationΔλ2is calculated by using an expression obtained from the multiple regression model of aboveβandλ2from this shape evaluation parameter deviationΔλ2and the work-roll bender force is controlled so that a desired plate shape is obtained even when the line load fluctuates from the reference line load.

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