锻压技术

铝合金空心型材挤压截面内凹变形有限元分析及模具结构优化设计

英文标题：FE analysis and die structure optimization design on concave distortion of extrusion section for aluminum alloy hollow profile

作者：王震虎何芯李落星

单位：湖南大学

关键词：铝合金空心型材截面变形挤压内凹数值模拟模具结构

分类号：TG376

出版年,卷(期):页码：2017,42(11):73-78

摘要：

截面变形是复杂空心型材挤压过程中经常遇到的难题，实际生产中需通过反复试模、修模才能得到合格的产品。针对6063铝合金空心型材截面内凹问题，采用数值模拟方法获得了挤压过程中不同方向上的金属流速及模具焊合室内不同高度的压力分布，分析与讨论了产生缺陷的原因，并优化了模具结构。模拟仿真结果表明，添加阻流块后挤压过程中型材不同位置和不同方向上的流动速度更加均匀，挤出型材向内凹的现象得到改善。实测结果显示，采用改进后的模具结构，挤压型材最大内凹量减小为0.15 mm，可以满足实际应用要求。

Section distortion is a difficult problem encountered in the extrusion process of complex hollow profile, and the repeated die tryout and modification were required to get qualified products. For the concave distortion of a complex thin-walled hollow profile 6063 aluminum alloy, the metal flow behavior in different directions and the pressure distributions for different heights in welding chamber were obtained by FE method. Then, the causes for section collapse were analyzed, and the mold structure was optimized. The simulation results show that the flow speeds of material at different positions and directions are more uniform in the extrusion process of profile after adding a restrictive block, and the concave distortion in the extrusion profile is modified. The experiment results show that the maximun concave amount of the extruded profile is reduced to 0.15 mm by adopting the improved die structure, and it can meet the requirements of practical applications.

基金项目：

国家自然科学基金资助项目（1664252，51475156）

作者简介：王震虎（1986-），男，博士研究生 E-mail：18216229991@163.com 通讯作者：李落星（1969-），男，博士，教授 E-mail: llxly2000@163.com

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