Fengli SUI
,
Liqing CHEN
,
Xianghua LIU
,
Lintao WANG
,
Wei LI
金属学报(英文版)
doi:10.1016/S1006-7191(08)60074-5
A coupled thermo-mechanical model containing metal flow and temperature field for calculating temperature variation has been developed on fourteen-pass hot continuous rolling of round rod for Inconel 718 alloy using 3D elastic-plastic finite element method (FEM). The temperature of characteristic analysis points in the intermediate cross-section of the workpiece has been simulated at initial temperature ranging from 960 to 1000 ℃ and initial velocity in range of 0.15-0.55 m．s-1. Based on finite element analysis and microstructural observation in cylindrical hot compression experiments, the appropriate hot continuous rolling technologies have been designed for rod products with different diameters. For a real rolling practice, the simulated surface temperature was examined and is in good agreement with the measured one.
关键词:
Hot continuous rolling
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Huiping HONG
,
Yonglin KANG
,
Changtao FENG
,
Xiqiang CHEN
材料科学技术（英文）
Based on the important boundary conditions of rolling simulation including friction, heat conduction and interactions of the workpiece and rolls, the hot continuous rolling processes of large-diameter mandrel round bar (200 mm in diameter) in 6VH-stand hot tandem mill are successfully simulated by three-dimensional coupled thermomechanical elastoplastic finite element method (FEM). The distributions of stress, strain, temperature and the rolling force and torque for the two-pass and four-pass continuous rolling are calculated respectively. Thus, the two and four-pass roll schedules are verified, respectively. The simulation results show that it is safe to produce 200 mm round bar by the two-pass (oval pass and round pass) continuous rolling on the existing equipment compared to the four-pass continuous rolling. There are concave surfaces and increased widths occurring at the end of rolled billet due to uneven deformations between the outside and inside of the workpiece as well as the free spreading close to the roll gap of the final pass.
关键词:
Mandrel
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