Comprehensive optimization technology of rolling temperature for seven stand hot strip mill
LI Xue-tong1,2, ZHANG Yan-dong1, YIN Bao-liang3, LI Zi-zheng1, KUANG Shuang3, WANG Rui3
1. National Engineering Research Center for Equipment and Technology of Cold Strip Rolling, Yanshan University, Qinhuangdao 066004, Hebei, China; 2. State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, Hebei, China; 3. Tangshan Iron and Steel Group Co., Ltd., Tangshan 063000, Hebei, China
Abstract:The rolling temperature during hot rolling will affect the deformation resistance and rolling force of the strip steel. Then the exit thickness and the exit shape distribution of the strip steel are changed. Therefore,the outlet thickness accuracy of strip steel will become lower and the outlet shape quality will become worse when the rolling temperature is set unreasonably. Fully consider the equipment characteristics and rolling process characteristics of the hot strip mill. Firstly,deformation resistance model and outlet thickness model and width model and outlet shape model are studied to solve these problems. The influence of rolling temperature on deformation resistance and exit thickness and strip width and exit shape is analyzed quantitatively. Aiming at the problem of poor exit shape quality caused by unreasonable rolling temperature setting. The horizontal control objective function and the longitudinal control objective function of strip shape are established with the extreme difference degree and fluctuation degree of strip shape distribution as constraints. And then,the shape synthesis control objective function is established. Aiming at the problem of low outlet thickness accuracy caused by unreasonable rolling temperature setting. Taking the standard deviation of the exit thickness deviation and the average value of the exit thickness deviation as constraints,the comprehensive control objective function of the strip thickness deviation was established. The comprehensive control objective function of the strip thickness deviation was established taking the standard deviation of the exit thickness deviation and the average value of the exit thickness deviation as constraints. On this basis,the best shape of the exit and the minimum deviation of the exit thickness are set as the goals. The limit rolling force and the spread and the range of rolling temperature of the seven stands are taken as constraints. The objective function of rolling temperature optimization for seven stand hot strip mill was established. The comprehensive optimization of the rolling temperature setting value of the seven-stand hot strip mill is realized. After the optimization technology is applied to the strip production of a domestic hot strip mill,the quality of strip shape at the exit is improved,and the accuracy of strip thickness control at the exit is improved.
李学通, 张燕东, 尹宝良, 李子正, 邝霜, 王瑞. 七机架热连轧机组轧制温度综合优化技术[J]. 钢铁, 2023, 58(3): 104-110.
LI Xue-tong, ZHANG Yan-dong, YIN Bao-liang, LI Zi-zheng, KUANG Shuang, WANG Rui. Comprehensive optimization technology of rolling temperature for seven stand hot strip mill[J]. Iron and Steel, 2023, 58(3): 104-110.
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