Wedge control analysis of finishing strip based on finite element simulation in hot continuous rolling
LIU Kun1, WANG Xiaochen2, ZHANG Tianming2, HE Hainan2
1. Technology Center, Tianjin Iron Works Company, Handan 056400, Hebei, China; 2. National Engineering Research Center of Flat Rolling Equipment, University of Science and Technology Beijing, Beijing 100083, China
Abstract：Strip wedge is key evaluation indicator for hot-rolled strip shape, and high quality hot-rolled strip steel places high demands on wedge indicators. The wedge control in finishing strip is coupled with plate shape problems such as strip deviation and flatness, and the wedge adjustment is difficult. On one hand, strip wedge will cause misalignment and production problems in the rolling process. On the other hand, strip wedge is one of the important indicators of finishing rolling export quality, if the wedge control is not up to standard, it is easy to cause strip with small thickness to wave in the rolling process, resulting in serious plate shape problems. Moreover, for the control of wedges in steel mills, relying on operator labor control, there are serious subjectivity, non-scientificity, inaccuracy, inefficiency and other control problems. The F7 exit wedge closed-loop feedback control model was established through finite element modelling as well as relationship between roll levelling and exit wedge on both sides of the mill. Based on different strip entrance thicknesses, strip widths and reduction, the influence for roll levelling on the exit wedge of both sides for the hot strip finishing mill was analyzed. A multi-stand regulation strategy based on genetic coefficients and roll levelling value distribution strategy based on wedge regulation limits were proposed. A model for calculating the tilted depression value of each stand for wedge control in finishing mills was obtained. The results have been used in industrial production, which ensures the rolling stability during wedge regulation and avoids additional strip profile problems caused by excessive tilting depression amount of single stand.
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2023, Vol. 33 
