Method for controlling planeness of cold-rolling strip steel

Abstract

The invention discloses a method for controlling the planeness of cold-rolling strip steel, which comprises the following steps of: carrying out planeness feed-forward control, planeness feedback control and coordination control between both; detecting the cross-section shape and the planeness of a hot rolling incoming material, and actually-measured rolling technological parameters of each framein real time based on a profiler configured on a No. 1 frame inlet, wherein the parameters comprise rolling force actually-measured values and plate shape adjusting mechanism actually-measured values, and carrying out the feed-forward control on the planeness of each frame outlet; and actually measuring the planeness of the cold-rolling strip steel based on a plate shape roller configured on an outlet of a cold rolling mill, and intensively carrying out the feedback control on the planeness of a final frame outlet. The method can eliminate the influences of the cross-section shape and the planeness of the hot rolling incoming material and fluctuations of the rolling technological parameters on the planeness of the final frame outlet to improve the planeness quality of the cold-rolling strip steel on the one hand, and can automatically control the planeness of each frame outlet, reduce incidence of abnormal conditions, such as fracture surfaces, deviation and the like, and improve the stability in the production process of tandem cold strip rolling on the other hand.

Description

technical field [0001] The invention relates to a rolling method of strip steel, in particular to a method for controlling the flatness of cold rolled strip steel on a cold rolling mill. Background technique [0002] At present, there are mainly the following types of flatness control systems for cold rolling mills: [0003] Most cold rolling mills are equipped with an automatic flatness control system focusing on the feedback control of the last stand. That is to say, at present, the most common configuration is to configure a shape meter at the outlet of the final frame to perform closed-loop control on the flatness of the outlet of the final frame. [0004] Some tandem cold rolling units are equipped with flatness feedback control systems on the 1# stand and the last stand respectively. The shape meter is installed at the outlet of 1# rack and the last rack respectively for flatness feedback control. The straightness quality ensures the rolling process is stable and st...

AI Technical Summary

Problems solved by technology

[0007] For the above-mentioned types of flatness control systems, the control target is mainly the flatness of the exit strip of the last frame. In addition, it mainly relies on manual adjustment, and cannot perform automatic control, and it is difficult to respond in time to the rapid changes in the cross-sectional shape of the hot-rolled incoming material and the rolling process parameters.

However, thin strip steel is prone to strip breakage during high tension rolling.

When the strip is corrugated, even with high tension rolling, the possibility of strip breakage is reduced

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