Effect of extrusion wheel angular velocity on continuous extrusion forming process of copper concave bus bar
Effect of extrusion wheel angular velocity on continuous extrusion forming process of copper concave bus bar
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DOI：
10.1016/s1003-6326(07)60085-5
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发表时间：
2007-04-01
影响因子：
4.5
通讯作者：
Cheng Lei
中科院分区：
文献类型：
--
作者：
Wu Peng-yue;Xie Shui-sheng;Cheng Lei
基于DEFORM-3D软件，采用三维有限元技术，对不同挤压轮角速度下大截面铜凹母线连续挤压成形过程进行了研究。模型采用刚粘塑性本构方程。数值模拟结果表明，随着挤压轮角速度的增大，模孔内变形体流动速度逐渐增大。但当挤压轮角速度较大时，杆与挤压轮之间会发生滑移。随着挤压轮角速度的增大，口模口附近的有效应力逐渐增大。高应力集中在闪光间隙的相邻区域中。有效应变梯度在支座附近大于模孔附近。随着挤压轮角速度的增大，制品的有效应变逐渐增大。在变形过程中，由于摩擦和变形，变形体温度显著升高。因此，在模具和工具的区域冷却是必要的。
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.