Differential roll bending method of working roll and used for controlling nonsymmetrical flatness defects

Abstract

The invention belongs to the field of rolling of cold-rolling strip steel and particularly relates to a differential roll bending method of a working roll and used for controlling nonsymmetrical flatness defects. The method is characterized in that differential adjustment is conducted on roll bending force on two sides of the working roll, roll bending force difference value enables roll gap shape to have nonsymmetrical change to offset the nonsymmetrical flatness defects. The method includes an achieving step of differential roll bending of the working roll and an effect coefficient initial value determining step of differential roll bending of the working roll. The effect coefficient Eff of the differential roll bending can be calculated according to relation between FS, delta F and actual flatness value, and the effect coefficient is the initial value of the differential roll bending of the working roll. Compared with the prior art, the method has the advantages that when nonsymmetrical flatness offset component is small, roll inclination can be replaced to control the nonsymmetrical flatness defects, and the problems of low stable state accuracy, large simultaneous fluctuation and the like existing in the roll inclination adjusting process can be remarkably removed. Differential roll bending of the working roll can be adopted to obtain stable flatness standard deviation distribution and smaller even flatness standard deviation.

Description

technical field [0001] The invention belongs to the field of cold strip steel rolling, in particular to a work roll differential bending method for controlling asymmetric plate shape defects. Background technique [0002] In the cold-rolled strip rolling process, the shape and thickness accuracy are two important external dimension indicators to measure the quality of the strip. The strip shape control technology has been widely studied as a cutting-edge technology in the field of steel rolling. Up to now, The research on the shape control mechanism and control method is still being improved and updated. Most of the flatness systems of domestic rolling mills are introduced with the rolling mill as a complete set, and the flatness control means are relatively solidified. At present, the shape control methods mainly include: CVC technology, PC technology, VC technology, back-up roll DSR technology, intermediate roll shifting, intermediate roll bending, work roll shifting, wor...

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a work roll differential bending method for controlling asymmetrical shape defects. When the asymmetrical shape deviation component is small, the work roll differential bending control is used instead of the roll inclination to control the asymmetrical plate shape defects, and eliminate the problems of low steady-state accuracy and large instantaneous fluctuations in the process of roll tilt adjustment

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