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Three-Dimensional Thermo-mechanical Coupled FEM Simulation for Hot Continuous Rolling of Large-Diameter Mandrel Bar

Journal of Materials Science & Technology 2003年第Z1期19卷 228-230页

作者： Huiping HONG Yonglin KANG Changtao FENG Xiqiang CHEN School of Materials Science and Engineering University of Sicence and Technology Beijing Beijing 100083 China Baoshan Iron and Stddl Co. Ltd.Shanghai 201900China School of Materials Science and Engineering University of Sicence and Technology Beijing Beijing 100083 China Baoshan Iron and Stddl Co. Ltd.Shanghai 201900China School of Materials Science and Engineering University of Sicence and Technology Beijing Beijing 100083 China Baoshan Iron and Stddl Co. Ltd.Shanghai 201900China School of Materials Science and Engineering University of Sicence and Technology Beijing Beijing 100083 China Baoshan Iron and Stddl Co. Ltd.Shanghai 201900China

Based on the important boundary conditions of rolling simulation including friction, heat conduction and interactionsof the workpiece and rolls, the hot continuous rolling processes of large-diameter mandrel round bar (200 mm indiameter) in 6VH-stand hot tandem mill are successfully simulated by three-dimensional coupled thermomechanicalelastoplastic finite element method (FEM). The distributions of stress, strain, temperature and the rolling force andtorque for the two-pass and four-pass continuous rolling are calculated respectively. Thus, the two and four-passroll schedules are verified, respectively. The simulation results show that it is safe to produce 200 mm round barby the two-pass (oval pass and round pass) continuous rolling on the existing equipment compared to the four-passcontinuous rolling. There are concave surfaces and increased widths occurring at the end of rolled billet due touneven deformations between the outside and inside of the workpiece as well as the free spreading close to the rollgap of the final pass.

关键词： Mandrel, Round bar, Hot continuous rolling, Thermomechanical coupled analysis,finite element method.

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