(1. 中南大學(xué) 材料科學(xué)與工程學(xué)院，長(zhǎng)沙 410083;
2. 華中科技大學(xué) 塑性成形模擬及模具技術(shù)國(guó)家重點(diǎn)實(shí)驗(yàn)室，
武漢 430074;
3. 云南省機(jī)械研究設(shè)計(jì)院， 昆明 650031)
摘 要: 通過采用有限元法與有限體積法相結(jié)合， 并在有限體積法中進(jìn)行分步計(jì)算的模擬方法， 在MSC Superforge有限元商業(yè)軟件上成功實(shí)現(xiàn)了薄壁大擠壓比鋁型材擠壓過程的數(shù)值模擬仿真， 獲得壁厚t=1.0 mm、 擠壓比λ=98.27的卷閘門型材擠壓過程的材料流動(dòng)速度場(chǎng)、 應(yīng)力場(chǎng)、 應(yīng)變場(chǎng)、 溫度場(chǎng)分布圖， 數(shù)值模擬結(jié)果與理論分析結(jié)果吻合較好。 結(jié)果表明： 采用帶導(dǎo)流槽的平模擠壓大尺寸、 大擠壓比型材， 可有效分配金屬， 平衡金屬流動(dòng)速度。
關(guān)鍵字: 大擠壓比; 鋁型材; 有限元法; 有限體積法; 數(shù)值模擬
WANG Fang3, YANG Li-bin1, PENG Da-shu1
（ 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
