A Thickness Control Method of 1720mm Strip Steel Continuous Cold Rolling Mill

Abstract

The invention discloses a method for controlling the thickness of a 1720mm strip steel cold tandem rolling unit, which belongs to the technical field of material processing engineering. The first thickness gauge and the first velocity gauge are installed on the front side of the first frame; the second thickness gauge and the second velocity gauge are installed on the rear side of the first frame; the third velocity gauge is installed on the rear side of the second frame The rear side of the fifth stand is equipped with a third thickness gauge; the present invention adjusts in advance according to the incoming material situation through the feedforward signal, and uses the indirect thickness measurement information of the thickness gauge at the entrance of the rolling mill to control the pressing of the rolling mill behind it. Reduce the control increment by delaying the pressing to avoid oscillation and reduce the lag time; through the feedback signal, the monitoring amount is fed back to the front frame in time, that is, the roll gap pressure is adjusted according to the deviation signal after comparing the measured value with the given value. Down position, control the thickness within the deviation range.

Description

technical field [0001] The invention relates to the technical field of material processing engineering, in particular to a method for controlling the thickness of a 1720mm strip steel cold tandem rolling unit. Background technique [0002] With the development of production and the advancement of science and technology, the quality requirements for strips are getting higher and higher, especially the requirements for the accuracy of their geometric dimensions are becoming more and more stringent. Many scholars at home and abroad have conducted in-depth research on how to improve the geometrical precision of strips for many years. Like the development of other technologies, the development of thickness adjustment technology for strip mills has also gone through a process from coarse to fine, and has successively experienced manual pressing to adjust plate thickness, electric pressing to adjust plate thickness, and electric double pressing system adjustment. Plate thickness, ...

AI Technical Summary

Problems solved by technology

[0004] The traditional AGC is mainly based on the thickness feedback method, that is, the thickness at the exit of the rolling mill is used for feedback closed-loop control of the reduction. A thickness gauge is installed at the exit of the rolling mill, and feedback control with the signal of the thickness gauge can make full use of the effect of the thickness gauge on the rolling thickness. Accurate thickness measurement information, but the lag is too large. Not only does the pressing mechanism have a response time, but it also takes a few seconds for the rolled piece to go from the rolling mill to the thickness gauge (the lower the rolling speed, the longer the time)

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