A roll bending compensation method and system aiming at flatness control

Abstract

The invention discloses a bending roll compensation method and system aiming at strip shape control. The method comprises: dividing the speed-up and down-speed process of rolling the strip into multiple sections; for each section, based on the process parameters of the equipment in the tandem cold rolling mill and the process parameters of the speed-up and down-speed section of the strip produced by the tandem cold rolling mill, the thickness of the oil film, the friction coefficient and rolling force; for each section, calculate the work roll bending force compensation value, the intermediate roll bending force compensation value and the compensated front tension based on the initial value of the compensation coefficient; construct the objective function according to the compensated front tension, and pass The objective function optimizes the pre-compensated tension; determines the optimized work roll bending force compensation value and the optimized intermediate roll bending force compensation value based on the optimized pre-compensated tension; based on the optimized work roll bending force compensation value And the optimized intermediate roll bending force compensation value compensates the work roll bending force and intermediate roll bending force of 1-4 stands.

Description

technical field [0001] The invention relates to the technical field of cold rolling, in particular to a roll bending compensation method and system aiming at strip shape control. Background technique [0002] In the tandem cold rolling mill, the head of the strip will bite into each stand in turn at the initial stage of rolling. Before the speed reaches a stable level, the thickness of the oil film between the strip and the roll will change due to the change of the speed. The change of the thickness of the oil film will lead to The friction coefficient between the two changes drastically, which causes the rolling pressure to change, resulting in unstable plate shape; at the end of rolling, the strip is thrown out of each stand in turn, and the rolling speed gradually drops to 0. During this period, the back tension Extremely unstable, the rolling force will also change drastically, resulting in poor plate shape; during the rolling period, the rolling speed of each stand may ...

AI Technical Summary

Problems solved by technology

In the rolling process of the cold tandem rolling mill, the rolling force of the rolled strip often changes drastically during the speed-up and down-speed stages, and the law of the rolling force varies with whether the emulsion flow rate is sufficient or not, resulting in flatness in the speed-up and down-speed sections. Poor, affecting production or use

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