蝶形模具挤压过程的数值模拟 - 中国有色金属学报.pdf

21 5 2011 5 Vol.21 No.5 The Chinese Journal of Nonferrous Metals May 2011 1004-0609(2011)05-0995-08 ( 100088) Simufact9.0 Euler 72.2%17.3% 11.2% TG146.2 A Numerical simulation of butterfly die extrusion process HE You-feng, XIE Shui-sheng, CHENG Lei, HUANG Guo-jie, FU Yao (State Key Laboratory of Nonferrous Metals and Processes, General Research Institute for Non-ferrous Metals, Beijing 100088, China) Abstract: Based on Simufact9.0 commercial software the non-steady state extrusion process of butterfly die was investigated using finite volume method (FVM) of Euler mesh description and compared with the traditional porthole die extrusion. The simulation results show that when the square tube profile is extruded using the butterfly die, the metal flow and deformation are more homogeneous than those of the traditional die, and the dead metal zone at the top of dividing bridge and welding chamber decreases. Furthermore, the extrusion load curve is smoother and there is no obvious mutation change. The breaking portholes load and the maximum extrusion load of the butterfly die are reduced by 72.2% and 17.3%, respectively. The effective stress distribution is more uniform, and the maximum effective stress is reduced by 11.2%which improves the die operating life. Moreover, the elastic deformation of the dividing bridge is lowered, and the stability of the die core is improved. Key words: butterfly die; aluminium profiles; finite volume method (FVM); numerical simulat