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| Improved model for calculating rolling load of ultra-high strength steel in cold rolling process |
| LIU Ya-xing1, GU Qing2, ZHANG Wen-jun1, BAI Zhen-hua1,3 |
1. National Engineering Research Center for Equipment and Technology of Cold Strip Rolling, Yanshan University, Qinhuangdao 066004, Hebei, China;
2. Institute of Electrical Engineering, Yanshan University, Qinhuangdao 066004, Hebei, China;
3. State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, Hebei, China |
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Abstract In order to solve the problem of large error in calculation of roll flattening curve in rolling deformation zone of ultra-high strength steel during cold rolling,fully considering the rolling characteristics of ultra-high strength steel,a new function model of roll flattening curve was constructed by analyzing the variation of roll flattening curve under different flattening radius,and the solution method of characteristic parameters of contact arc length and roll flattening curve in the function was given. Based on this,according to the relationship between deformation and stress in elastic-plastic theory,the calculation process of unit rolling pressure distribution in entrance elastic deformation zone,plastic reduction deformation zone and exit elastic deformation zone was deduced,and the calculation model of total rolling force in cold rolling process of ultra-high strength steel was established. And,the model has been applied to 2030 tandem cold rolling mill of a steel plant to verify the calculation accuracy of the model. The results showed that the roll flattening curve in the cold rolling process of ultra-high strength steel is expressed by quadratic function,which can more accurately reflect the roll flattening state,and the calculated results are in good agreement with the actual values. Meanwhile,it provides a theoretical basis for the evaluation of ultimate rolling capacity and the formulation of rolling schedule of ultra-high strength steel products produced by tandem cold rolling mill.
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Received: 26 February 2021
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2021, Vol. 56 
