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

摘要

Based on the important boundary conditions of rolling simulation including friction, heat conduction andinteractions of the workpiece and rolls, the hot continuous rolling processes of large-diameter mandrelround bar (200mm in diameter) in 6VH-stand hot tandem mill are successfully simulated by threedimensional coupled thermo-mechanical elastoplastic Finite Element Method (FEM). The distributions ofstress, strain, temperature and the rolling force and torque for the two-pass and four-pass continuousrolling are calculated respectively. Thus, the two and four-pass roll schedules are verified, respectively.The simulation results show that it is safe to produce 200mm round bar by the two-pass （oval pass andround 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 unevendeformations between the outside and inside of the workpiece as well as the free spreading close to theroll gap of the final pass.