A flatness control method for a cold rolling mill

Abstract

The invention discloses a strip shape control method of a cold rolling mill, comprising the following steps: calculating the initial amount of bending roll adjustment and the initial amount of cooling adjustment according to the plate shape deviation; calculating the final amount of bending roll adjustment, the final amount of cooling adjustment and the rolling Controlled amount of braking force; finally adjust the shape of the plate according to the final adjustment amount of bending roll, the final adjustment amount of cooling and the controlled amount of rolling force. The invention improves the adjustment ability and adjustment range of the cold rolling mill for the shape of the plate, and also improves the adjustment quality of the shape of the plate.

Description

technical field [0001] The invention relates to the technical field of strip shape control, in particular to a strip shape control method for a cold rolling mill. Background technique [0002] The plate shape is the flatness of the metal plate and strip, indicating the degree of warping of the strip. Plate shape is one of the most important geometric shape indicators of plate and strip, and good plate shape is a must-have property for high-quality plate and strip. The cold rolling mill usually adopts the shape automatic control system to control the shape of the metal plate and strip, so that the shape of the output strip reaches the desired target state. [0003] The cold rolling mill is equipped with rolls and roll bending structures. In the flatness automatic control system, four-high cold rolling mills generally use three methods of roll tilting, bending and cooling to control and adjust the flatness. However, in the actual control and adjustment process Among them, du...

AI Technical Summary

Problems solved by technology

[0003] The cold rolling mill is equipped with rolls and roll bending structures. In the automatic control system of the plate shape, the four-high cold rolling mill generally uses three methods of roll tilting, bending and cooling to control and adjust the plate shape. However, in the actual control and adjustment process Among them, due to the limitation of the equipment structure, the bending roll has a certain limit condition, which is only allowed to change within a certain range, and for the strip with narrow width and thin thickness, the effect of adjusting the bending roll on the shape adjustment during rolling The effect is small, and it is often necessary to adjust a lot of bending rolls to affect the shape of the plate, and the adjustment effect is not good; similarly, the design of the cooling system also has a certain limit condition, which is only allowed to change under a certain flow pressure condition. There are also significant limitations in the ability to adjust

[0004] Therefore, the existing flatness control method for cold rolling mills has a weak ability to adjust the flatness and cannot meet the needs of use

Images