Spalling analysis and roll shape optimization of support roll for continuous annealing and temper mill
YAN Lei1, QI Chunyu1, SUN Jianhua1, SHANG Guangpeng1, LIU Zhibo1, SONG Yuankun2
1. Continuous Annealing Division, Beijing Shougang Cold Rolled Sheet Co., Ltd., Beijing 101300, China; 2. School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, China
Abstract：Aiming at the problem of support roll spalling in the production process of a continuous annealing and temper unit in a factory, the research was carried out from the aspects of field test, theoretical analysis and finite element simulation, etc. It is found that the spalling of support roll is related to the concentration of contact stress between intermediate roll and support roll. Combined with the equipment and process characteristics of temper mill, roller shape optimization design of the support roller is carried out. The new roll shape makes the contact pressure distribution between the support roll and the intermediate roll more uniform, and the average contact pressure between the rolls can be reduced by 5.82%-17.16% compared with the original roll shape, and the peak contact pressure between the rolls can be reduced by 26.16%-62.37% compared with the original roll shape, which reduces the stress concentration and does not affect the shape control performance. After the application of the new roll shape, the supporting roll of the unit does not spalling again, and the quality of the strip shape produced is good.
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