Formation Mechanism in Alloy Steel Rolling Process Using Thermo-mechanical Coupling Method  

作　　者：杨理诚 

机构地区：[1]Department of Mechanical Engineering, Hunan Institute of Engineering [2]Faculty of Engineering, University of Technology

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2012年第3期422-426,共5页武汉理工大学学报（材料科学英文版）

基　　金：Funded by National Natural Science Foundation of China (No. 51004047);Scientific Research Fund of Hunan Provincial Education Department (No. 10B020);Provincial Natural Science Foundation of Hunan (No. 09jj4024)

摘　　要：Based on the theory of elastic-plastic finite element method, the high-speed hot continuous rolling process of a billet is simulated and analyzed in vertical and horizontal passes. The billet is dragged into the passes by contact friction force between the billet and rollers. The rollers and billet are represented by respectively rigid and deformable bodies, and three-dimensional models are developed for the billet and rollers. The distribution of deformation field, effective strain, rolling force and temperature field are accurately calculated for the whole rolling process （including unstable and stable stages）. In addition, the rolling pressure on the width symmetry center is compared with that in the in-situ experimental measurements. It is revealed that various heat exchange phenomena among the billet, rollers and surroundings can result in unbalanced temperature distribution on the cross section. Rolling force and strain can change significantly when the billet is moved towards or away from the roller gap, and keep almost invariable in the stable stage. It is expected that the simulation results would be useful for practical manufacture and provide the theoretical foundation for improvement of process planning and optimization of process parameters.Based on the theory of elastic-plastic finite element method, the high-speed hot continuous rolling process of a billet is simulated and analyzed in vertical and horizontal passes. The billet is dragged into the passes by contact friction force between the billet and rollers. The rollers and billet are represented by respectively rigid and deformable bodies, and three-dimensional models are developed for the billet and rollers. The distribution of deformation field, effective strain, rolling force and temperature field are accurately calculated for the whole rolling process （including unstable and stable stages）. In addition, the rolling pressure on the width symmetry center is compared with that in the in-situ experimental measurements. It is revealed that various heat exchange phenomena among the billet, rollers and surroundings can result in unbalanced temperature distribution on the cross section. Rolling force and strain can change significantly when the billet is moved towards or away from the roller gap, and keep almost invariable in the stable stage. It is expected that the simulation results would be useful for practical manufacture and provide the theoretical foundation for improvement of process planning and optimization of process parameters.

关 键 词：thermo-mechanical coupling temperature field deformation mechanism hot rolling process 

分 类 号：TG335[金属学及工艺—金属压力加工]