Method for eliminating local wear of working roller of CVC (continually variable crown) mill

Abstract

The invention relates to the technical field of steel rolling, in particular to a method for eliminating local wear of a working roller of a CVC (continually variable crown) mill, which comprises the following steps: (1) setting the shifting step, the upper bending force compensation limit and the lower bending force compensation limit of the working roller, given that the shifting increment of the working roller deltaD = Delta; (2) calculating the set bending force value F(i) of the ith roll of strip steel; (3) judging whether F(i) exceeds the bending force compensation limit; (4) outputtingthe set shifting value D(i) and the set bending force value F(i) of the working roller of the ith roll of strip steel; and (5) given that i = i +1,, carrying out presetting calculation of control parameters of a following roll of strip steel sheet. The periodic shifting frequency and amplitude of the working roller can be changed through changing the shifting step, the bending force compensation limits and other parameters, the effects of eliminating the local wear of the working roller and controlling local high points of edges of a hot-rolled sheets can be achieved, the promotion and application on CVC mills of the same category can be easily realized.

Description

technical field [0001] The invention relates to the technical field of steel rolling, in particular to a method for eliminating local wear of work rolls of a CVC rolling mill. Background technique [0002] With the increasing demand for automobiles and household appliances in my country, the manufacturing industry of automobiles and household appliances has developed rapidly, and at the same time, the requirements for various quality indicators of raw materials have also been continuously improved. As the main raw material for automobiles and home appliances, the shape quality of cold-rolled sheets has a decisive impact on the appearance of the final automobile and home appliances. The shape quality of cold-rolled sheet depends largely on the shape quality of its hot-rolled raw materials. [0003] The local high point refers to the phenomenon that the thickness of the thin plate is obviously too large in a small width range, which belongs to the high-order plate shape defec...

AI Technical Summary

Problems solved by technology

Due to the thinner thickness of the strip steel during the cold rolling process, the lateral fluidity of the metal is weakened, and the longitudinal elongation rate of the strip steel at the local high point position is obviously higher than that at other positions, and it is easy to produce local high-order waves. Seriously affect the extraction process and final product quality

Therefore, hot-rolled raw materials with local high-point defects have extremely bad effects on the quality of cold-rolled final products

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