锻压技术

模具入口角度对铜排连续挤压扩展成形的影响

英文标题：Effects of die entry angles on copper bus bar continuous extrusion extending forming

作者：曹雪刘元文裴久杨

单位：大连交通大学

分类号：TG376

出版年,卷(期):页码：2013,38(5):91-96

摘要：

连续挤压扩展成形是一种先进的铜排制造方法，而模具入口角度是影响产品成形的重要因素。根据连续挤压变形特点，采用刚粘塑性有限元法，应用Deform-3D软件，针对模具的不同入口角度进行连续挤压变形过程的模拟。分析了不同模具入口角度对连续挤压各变形区温度、等效应力、等效应变、速度场以及工模具载荷产生的影响。结果表明，在扩展成形阶段，当模具入口角度为15°时，变形金属等效应力分布均匀，拐角处应力集中小，定径带处金属流动速度的均方差最小仅为0.05，挤压轮扭矩和腔体载荷都比较合理，有利于扩展成形。通过试验验证了模拟结果，为连续挤压模具优化设计提供了重要的理论依据。

Continuous extrusion extending deformation is an advanced forming process for manufacturing copper bus bar and the entry angle of die is the important factor that affects product forming. According to the characteristics of continuous extrusion deformation, the copper bus bar continuous extrusion deforming process by adopting the dies of different entry angles was simulated using rigid-plastic FEM based on Deform-3D, the temperature, strain-effective, stress-effective, load and velocity field were analyzed. Results show that in the extending forming stage, when the die entry angle is 15°, the stress-effective distribution is more uniform, the stress concentrating on the corner is small, the metal flow velocity mean-squared error at die working area is the minimum of 0.05, the torque of extrusion wheel and load of chamber are reasonable, which are in favor of extending forming. The simulation results were verified by experiment，which provides important theoretical foundation for the continuous extrusion die-design optimization.

基金项目：

国家科技支撑计划资助项目（2011BAE23B01）

曹雪（1978-），女，硕士，助理工程师

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