Roll-bending force feed-forward compensation method and compensation system for cold-rolling mill

Abstract

The invention discloses a roll-bending force feed-forward compensation method for a cold-rolling mill. The method includes the steps: firstly, determining feed-forward compensation enable signals according to rolling conditions, speed values and acceleration and deceleration conditions; secondly, saving average value of lower rolling force to serve as rolling force reference values of the acceleration and deceleration process when the enable signals appear sampling instant of rising edges, enabling rolling force actual values to subtract the rolling force reference values to obtain rolling force fluctuating values, and calculating change values of corresponding roll-bending force according to the rolling force fluctuating values; finally, adding the change values of the roll-bending force to roll-bending force compensation values saved at the last minute of last acceleration and deceleration to obtain final roll-bending force compensation values, accumulating the obtained final roll-bending force compensation values to set values of roll-bending force of a working roller, and executing the process by the aid of a roll-bending force hydraulic cylinder to finish the roll-bending force feed-forward compensation method. The invention further provides a roll-bending force feed-forward compensation system for the cold-rolling mill. The compensation method is automatic, high in accuracy, rapid in response and good in instantaneity, and control accuracy of plate shapes at the acceleration and deceleration stage of the cold-rolling mill can be effectively improved.

Description

technical field [0001] The invention belongs to the technical field of strip shape control of rolling mills, and in particular relates to a roll bending force feed-forward compensation method and compensation system for a single-stand reversing cold rolling mill or a multi-stand cold rolling mill. Background technique [0002] The cold rolling mill will experience multiple acceleration and deceleration processes during the rolling process: after the rolling mill starts, it will generally undergo multiple accelerations until it reaches a stable rolling speed; when a coil of steel is about to be rolled, it will also undergo several decelerations to gradually Speed ​​down to zero. During the acceleration and deceleration stages of the rolling mill, the technical parameters such as rolling force, tension, and roll gap are in a state of large fluctuations, thus affecting the flatness index of the strip. Generally speaking, the shape value fluctuates greatly during the accelerati...

AI Technical Summary

Problems solved by technology

[0003] (1) The accuracy of manual adjustment is very limited, and skilled operators can only ensure that the adjustment trend is correct, and the compensation amount of bending force cannot be accurate; this is because the high-precision adjustment of bending force is based on the If the braking force changes and changes in real time, manual adjustment can only increase or reduce the bending force by slope, and cannot follow the change of rolling force in real time;

[0004] (2) Manual adjustment is generally only completed at low speeds, and no adjustments will be made during subsequent large-scale speed-ups;

[0005] (3) Manual adjustment takes a long time; in order to speed up the adjustment speed, generally a bending force adjustment amount is given in advance based on experience, and then the shape of the plate is observed for a period of time. If the shape of the plate is better, no adjustment is made. If the shape of the plate is not ideal, it will continue to adjust, so the whole adjustment process will take a long time

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