Smart-shifting strategy of work rolls for downstream stands in hot rolling

Abstract

In the hot rolling process, the shifting strategy of downstream work rolls has been explored for a long time, as much as possible to guarantee uniformity of roll wear along the width of the strip, thereby improving the steel strip profile. So a smart-shifting strategy based on differentiated step size in the cycle with the sine function is proposed to make the roll wear distribute more evenly, in which a new hybrid optimization algorithm is adopted to find the optimal control parameters. A large number of industrial experiments for the production of non-oriented silicon steel demonstrated that the new strategy was able to improve the wear contour of work roll, and increased the uniformity of the thickness distribution of the strip along the width direction. This has important implications for the improvement of the dimensional accuracy of the strip.