中國有色金屬學(xué)報(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 17 No. 2 April 2007 |
on continuous extrusion forming process
of copper concave bus bar
YAN Ming(鄢 明)1, HUANG Guo-jie(黃國杰)1, CHENG Lei(程 磊)1
（1. State Key Laboratory for Fabrication and Process of Nonferrous Metals,
General Research Institute for Nonferrous Metals, Beijing 100088, China;
2. Yunnan Copper Products Ltd, Kunming 650102, China）
Abstract: The continuous extrusion forming process for producing large section copper concave bus bar under different extrusion wheel angular velocities was studied by three-dimensional finite element technology based on software DEFORM-3D. The rigid-viscoplastic constitutive equation was employed in the model. The numerical simulation results show that the deformation body flow velocity in the die orifice increases gradually with the increase of the extrusion wheel angular velocity. But slippage between the rod and extrusion wheel occurs when the extrusion wheel angular velocity is high. The effective stress near the die orifice enhances gradually with increasing extrusion wheel angular velocity. High stress is concentrated in adjacent regions of the flash gap. The effective strain gradient is greater near the abutment than that near the die orifice. The effective strain of the product increases gradually with increasing extrusion wheel angular velocity. In the deformation process, the deformation body temperature increases remarkably due to friction and deformation. So the cooling is necessary in the region of the die and tools.
Key words: copper concave bar; continuous extrusion forming; extrusion wheel angular velocity; finite-element method
