JPS5633109A - Controlling method for rolling mill - Google Patents

Abstract

PURPOSE: To normalize the operation of the rolling work, by controlling the suitable proportion between the roll bending forces on the work side and the drive side so as to satisfy the control variables for the roll bending force, at carrying out the off-center rolling work for the rolled materal.

CONSTITUTION: At carrying out the off-center rolling work for the rolled material by intentionally shifting the breadth center of the rolled material from the mill center, the suitable proportion between the roll bending forces is obtained, and the rolling reduction is controlled so as to compensate the elongation difference caused by the difference of the roll bending forces. The roll bending force on the work side is taken as Fw, and the roll gap increment on the work side to be caused by above Fw is taken as 2Δywd, and the roll gap increment on the drive side is taken as 2ywd; similarly, the roll gap increments on the work side and the drive side are respectively taken as 2Δydw, 2Δydd, for the roll bending force Fd to be loaded on the drive side; then, the formula I is established. Further, the material sheet breadth is taken as (b), the distance between the roll chocks is taken as l, the roll gap increments on both sides are taken as 2Δyw, 2Δyd, and the rolling reduction increments are taken as ΔSw, ΔSd; then, the formula II is established. According to the formulas I, II, the rolling mill is controlled.

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