(1. 中南大学 材料科学与工程学院，长沙 410083;
2. 华中科技大学 塑性成形模拟及模具技术国家重点实验室，
武汉 430074;
3. 云南省机械研究设计院， 昆明 650031)
摘 要: 通过采用有限元法与有限体积法相结合， 并在有限体积法中进行分步计算的模拟方法， 在MSC Superforge有限元商业软件上成功实现了薄壁大挤压比铝型材挤压过程的数值模拟仿真， 获得壁厚t=1.0 mm、 挤压比λ=98.27的卷闸门型材挤压过程的材料流动速度场、 应力场、 应变场、 温度场分布图， 数值模拟结果与理论分析结果吻合较好。 结果表明： 采用带导流槽的平模挤压大尺寸、 大挤压比型材， 可有效分配金属， 平衡金属流动速度。
关键字: 大挤压比; 铝型材; 有限元法; 有限体积法; 数值模拟
（ 1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. State Key Laboratory of Plastic Forming Simulation and Die Technology, Huazhong University of Science and Technology, Wuhan 430074, China;
3. Yunnan Mechanical Research and Design Institute, Kunming 650031, China）
Abstract: A new simulation system was developed by integrating the finite element method (FEM) and the finite volume method (FVM) based on the theories of large deformation elastic-plastic finite element method and finite volume method. To avoid time-consuming and obtain reasonable results in the simulation, the optimized geometry models were employed in the pre-processor. The forming of a complex thin-walled aluminum profile with large extrusion ratio λ=98.27 and 1 mm in thickness, was successfully simulated in the new simulation system on the platform of MSC Superforge. The simulation results are agreeable to the general extrusion principles. The distributions of velocity field, effective stress field, effective strain field and temperature field during the extrusion process were discussed and the metal process was analyzed in details. The results indicate that the flow guide is effective in balancing the metal deforming during the profile extrusion process with large extrusion ratio.
Key words: large extrusion ratio; aluminum profile; finite element method; finite volume method; numerical simulation
