Head bending law during rough rolling processbased on thermo-mechanical coupling
PENG Wen1,2, WEN Hong-bo1, LI Xu-dong3, FAN Xing-guo3, SUN Jie1,2, ZHANG Dian-hua1,2
1. State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, Liaoning, China; 2. Institute for Frontier Technologies of Low-Carbon Steelmaking, Northeastern University, Shenyang 110819, Liaoning, China; 3. Research Institute of Technology, Shougang Group Co., Ltd., Beijing 100043, China
Abstract：Head bending is a common defect in the process of hot rough rolling process. It affects the quality and rolling stability of strip products during the production process seriously. In actual production,due to the asymmetry of the temperature drop on the upper and lower surfaces of the rolled piece and the rolling process parameters,the rolled piece is prone to head bending after rough rolling. In order to realize the modeling description of the head bending law,based on the heat transfer theory and the rigid-plastic variational principle,the thermo-mechanical coupling finite element model is established by ABAQUS. In the case of misalignment of the rolling line,the effect of the temperature distribution of the rolled piece on the head bending,and the effect of roll speed ratio,reduction rate and entry thickness on the head bending under the condition of misalignment of rolling line and temperature difference between upper and lower surfaces of rolled piece were systematically analyzed. Finally,the effect of various process factors on the head bending was obtained by fitting,and the prediction of the head bending was realized. The simulation results show that with the increase of the temperature difference between the upper and lower surfaces,the downward bending of the rolled piece gradually increases;the roll speed ratio,the reduction rate and the entry thickness all have an effect on the head bending,and are coupled with each other;with the increase of the roll speed ratio,the bending angle gradually becomes larger,and the head the rolled piece changes from the downward bending to upward bending;with the increase of the thickness,the head of the rolled piece gradually tends to be straight;with the increase of the reduction rate,the bending angle fluctuates within a certain range. The field measurement data shows that based on the established prediction model,the proportion of the predicted angle deviation within ±5° is 90.10%,which verifies the validity of the established model and achieves accurate prediction of head bending. It can provide a reference for the process optimization of the rough rolling process.
彭文, 文红博, 李旭东, 樊兴国, 孙杰, 张殿华. 基于热-力耦合的粗轧过程头部弯曲规律[J]. 钢铁, 2023, 58(1): 116-124.
PENG Wen, WEN Hong-bo, LI Xu-dong, FAN Xing-guo, SUN Jie, ZHANG Dian-hua. Head bending law during rough rolling processbased on thermo-mechanical coupling[J]. Iron and Steel, 2023, 58(1): 116-124.
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2023, Vol. 58 
