Flying gauge change control method of tandem cold mill

Abstract

The invention discloses a flying gauge change control method of a tandem cold mill. The method comprises the following steps: determining a transition region of flying gauge change, computing transition coefficients according to the length of the transition region, the original thickness of strip steel before the strip steel is rolled by a frame and the set thickness of the strip steel after the strip steel is rolled by the frame, computing a roll gap set value for dynamic adjustment of each frame according to the transition coefficients when a transition process is performed, and adjusting the strip steel discharge speed of each frame according to fair current. By adopting the method, the flying gauge change process of the tandem cold mill can be optimized, the smoothness of flying gauge change is improved, equipment impact is reduced, out-of-tolerance of strip steel is reduced, the speed of flying gauge change is increased, and the time of flying gauge change is shortened.

Description

technical field [0001] The invention relates to metallurgical automation technology, in particular to a dynamic specification-variable control method of a cold tandem rolling mill. Background technique [0002] The fully continuous tandem cold rolling mill can not only roll the same raw material into products with the same or different thicknesses, but also roll different raw materials into products with the same or different thicknesses, which requires that it can be dynamically rolled during the rolling process. The realization of product specification transformation. Because if the specification change cannot be completed while the rolling mill is rolling, but must be realized by shutting down, it cannot be called fully continuous rolling. Therefore, the dynamic specification change is very important for realizing the full continuous rolling method. It is not only the most obvious feature of the full continuous cold rolling mill to distinguish the conventional cold rolli...

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Problems solved by technology

[0016] The main logical functional units that complete the dynamic gauge change control at the basic automation layer include roll gap control, speed control, and tension control. Logic function units such as control and on-line inspection instruments are closely related, so it is not ideal to optimize the dynamic variable specification control only by L2. In addition to the best adjustment (control) method, it is also necessary to establish a calculation method for the speed of each frame and the adjustment amount of the roll gap

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