Finish rolling stability control method

Abstract

The invention discloses a finish rolling stability control method, and belongs to the technical field of rolling processes. The finish rolling stability control method comprises the following steps: the load distribution of a finish rolling machine is controlled; the tension distribution of the finish rolling machine is controlled; the plate strip convexity ratio is controlled; the control of theplate strip convexity ratio comprises the following steps: a formula of Ci / Hi=Ci+1 / Hi=1 is adopted according to a frame plate type straightness control theory, wherein Ci is the outlet convexity of anupstream frame, Hi is the outlet thickness of the upstream frame, and i is the ith frame number; the frame convexity distribution adopts the set convexity 1; and when the frame outlet thickness is larger than 7 mm, a formula of Ci / Hi=(Ci+1 / Hi+1)*delta is adopted, wherein delta is the transverse nonuniform extension coefficient. The finish rolling stability control method guarantees the stabilityin the finish rolling process, and solves the vibration problem of the rolling machine, the surface quality problem, the center wire control problem and the plate type problem.

Description

technical field [0001] The invention relates to the technical field of rolling technology, in particular to a method for controlling the stability of finish rolling. Background technique [0002] When the finishing mill rolls wide and thin specifications, especially the limit specifications with a width-to-thickness ratio greater than 750 and a thickness less than 2mm, the rolling performance is outstanding. The problem is that the load of the rolling mill is heavy, the vibration of the rolling mill is serious, and the rolling stability is poor, and it is impossible to form batch rolling. production mode. After the vibration of the rolling mill is severe, the oxide film on the surface of the roll is severely damaged, causing the surface oxide scale to be pressed in by foreign matter, which is unacceptable for automobile sheets, pickling sheets and other varieties. The 2160 rolling mill in the prior art is a six-stand continuous rolling mill. There is no powerful small verti...

AI Technical Summary

Problems solved by technology

[0003] The invention provides a finishing rolling stability control method, which solves or partially solves the poor stability in the finishing rolling process in the prior art, especially for hot-rolled high-strength strip steel with a width-to-thickness ratio greater than 750 and a thickness less than 2 mm. , the rolling mill has large vibration fluctuations, poor surface quality, center line control cannot be guaranteed, and technical problems of poor plate shape

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