Integrated flatness control technology for seven-stand tandem hot strip mill
ZHANG Jin-fei1, YAO Hong-yong1, LI Zi-zheng1, KUANG Shuang2, BAI Zhen-hua1,3
1. National Engineering Research Center for Equipment and Technology of Cold Strip Rolling, Yanshan University, Qinhuangdao 066004, Hebei, China; 2. Technical Center, Tangshan Iron and Steel Group Co., Ltd., Tangshan 063000, Hebei, China; 3. State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, Hebei, China
Abstract：In the seven-stand tandem hot strip mill, due to the large number of stands, the complex rolling process and the control capability of each stand cannot be fully exerted, resulting in problems such as medium wave, edge wave and complex wave in the shape of the rolled product. Taking full account of the structural characteristics of the equipment of the seven-stand tandem hot strip mill, combined with the rolling process conditions, the relative length difference method is used to express the shape value of the rolled piece. Taking the loaded roll gap of the rolling mill as a bridge, the coupling relationship between the elastic deformation model of the roll system and the metal deformation model is used to solve the problem, and the shape prediction model of the hot strip mill is established. According to the characteristics that work roll bending force and roll shifting amount can rapidly adjust the flatness of the rolled piece, and combined with the actual production situation, the research scope of work roll bending force and roll shifting amount is determined. Based on the shape prediction model, the change process of the roll gap crown with load of the rolling mill and the flatness of the rolled piece under the conditions of different work roll bending forces and roll shifting amount is quantitatively analyzed, and the control region of the flatness of the rolled piece is obtained. On this basis, the comprehensive flatness control strategy is proposed. At the same time, in order to ensure the requirements of the crown of the rolled piece and avoid excessive wear of the rolls, the constraint conditions of the thickness accuracy of the rolled piece outlet and the contact pressure uniformity between rolls of each stand are proposed. Taking the minimum fluctuation of the rolled piece flatness of each stand as the objective function, the bending force and roll shifting amount of the work roll are comprehensively optimized, and the comprehensive flatness control technology suitable for the hot strip mill is developed. The technology was applied to the production practice of a 2 050 hot strip mill, and the results showed that the flatness quality of the rolled piece during the hot strip mill process was significantly improved before and after the optimization of the bending force of the work roll and the roll shifting amount of the typical products, and the flatness at the exit of the rolled piece was improved from 10.5 I to 4.8 I. The field application effect was good.
张金飞, 么洪勇, 李子正, 邝霜, 白振华. 七机架热连轧机组板形综合控制技术[J]. 钢铁, 2023, 58(3): 97-103.
ZHANG Jin-fei, YAO Hong-yong, LI Zi-zheng, KUANG Shuang, BAI Zhen-hua. Integrated flatness control technology for seven-stand tandem hot strip mill[J]. Iron and Steel, 2023, 58(3): 97-103.
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2023, Vol. 58 
