Dynamic roll gap compensation method during cold continuous rolling flying gauge control

Abstract

The invention discloses a dynamic roll gap compensation method during cold continuous rolling flying gauge control and belongs to the technical field of automatic control of cold continuous rolling. The method includes a part of roll gap compensation for a welding gap position at the position of a rolling mill inlet front thickness gauge and a part of roll gap compensation for the welding gap position at the positions of all rolling mill outlet thickness gauges. A roll gap adjustment value is determined by a model system of a process computer to a great degree due to the fact that a large part of AGC functions are not introduced during flying gauge control. Therefore, computational accuracy of the model system can directly affect thickness control accuracy during flying gauge control. A practical inlet thickness acquired by using a practical thickness gauge at the position of the rolling mill inlet front thickness gauge is adopted to replace a raw material thickness to improve initial data accuracy for setting a model, and a set value of a roll gap during FGC is corrected according to calculated deviation between a front steel coil roll gap and a back steel coil roll gap so as to improve setting accuracy of the roll gap. More accurate roll force is acquired in the method of dynamic self-adapting at the positions of all the rolling mill outlet thickness gauges, setting accuracy of the roll gap is improved, and then the roll gap value can be compensated during flying gauge control.

Description

technical field [0001] The invention belongs to the technical field of automatic control of continuous cold rolling, and in particular provides a dynamic roll gap compensation method when the continuous specification of cold rolling changes dynamically. Background technique [0002] FGC (Flying Gauge Control) is to change the rolling schedule of the previous coil to the rolling schedule of the next coil under the condition of non-stop rolling mill, and complete the change of the thickness and width of the strip before and after. FGC is a complicated change process, in which the roll gap and roll speed of each stand of the cold tandem rolling mill will be adjusted several times, the tension and rolling force of each stand will also change accordingly, and the exit thickness of each stand cannot be changed. Avoid fluctuations will occur, thereby affecting the thickness accuracy of the finished strip. In addition, because the roll gap and roll speed have to be adjusted many ti...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a dynamic roll gap compensation method when the specification is dynamically changed in continuous cold rolling, which solves the technical problems of low thickness control accuracy and out-of-tolerance thickness at the head and tail when the specification is dynamically changed; and improves the yield of cold-rolled strips Rate

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