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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 17    Special 1    November 2007

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Non-steady FE analysis on porthole dies extrusion of
aluminum harmonica-shaped tube
CHENG Lei(程  磊), XIE Shui-sheng(谢水生), HUANG Guo-jie(黄国杰),
WU Peng-yue(吴朋越), HE You-feng(和优锋)

State Key Laboratory for Fabrication and Process of Nonferrous Metals,
General Research Institute for Nonferrous Metals, Beijing 100088, China

Abstract:According to the rigid-viscoplasticity finite element method, the porthole die extrusion process of an aluminum harmonica-shaped tube was successfully simulated based on software Deform-3D. The distribution of stress field, effective strain field, velocity field and temperature field during the extrusion process were discussed and the metal flow in welding extrusion was analyzed. The simulation results show that the material flow velocities in the bearing exit are non-uniform with the originally designed die and the forepart of the profile is not neat or even. Aiming at solving this problem, the modification method of die structure was improved. The result shows that the uniform material flow velocities in the die exit and a perfect extruded are obtained by modification bearing length.

 

Key words: electrodeposited nickel coating; solid element; finite element method; variable blankholder force

ISSN 1672-7029
CN 43-1423/U

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