锻压技术

基于Deform-3D方管铝合金型材等温挤压的变速挤压数值模拟

英文标题：Numerical simulation of variable speed extrusion for isothermal extrusion process of aluminum alloy square tube based on Deform-3D

作者：杨志高1 徐永礼2 庞祖高1 黄尚猛3 班米扁1

单位：1.广西大学 2.广西水利电力职业技术学院 3.广西机电职业技术学院

关键词：铝合金型材 Deform-3D 等温挤压数值模拟

分类号：

出版年,卷(期):页码：2015,40(4):152-157

摘要：

基于Deform-3D有限元分析，建立分段变速挤压模型对方管铝合金型材的挤压工艺进行数值模拟研究。结果表明：挤压速度越高，型材在模具出口处温度越高，温度差也越大，采取7，5和3 mm·s-1的分段变速挤压能有效实现模具出口处温度差恒定于8 ℃左右的等温挤压。在等温挤压环境下，最大等效应力值为47.4 MPa，最大等效应变值为7.92，最大损伤程度为1.70，比中间速度5 mm·s-1等速挤压模型的相应值分别下降了10%、23.8%和48.5%，且型材表面质量好，金相组织细致均匀，力学性能高。

ased on Deform-3D finite element analysis, the variable speed extrusion model of aluminum alloy square tube was built and the extrusion process was simulated numerically. The results show that the higher the extrusion speed is, the higher the temperature in the mold exitis, and the bigger the temperature difference is. The isothermal extrusion with constant temperature difference of 8 ℃ in the mold exit can be realized effectively by segmented variable speed extrusion with velocities of 7，5，3 mm·s-1. The maximum effective stress is 47.4 MPa,the maximum effective strain is 7.92, and the maximum damage is 1.70 under isothermal extrusion condition, which are reduced by 10%, 23.8% and 48.5% respectively compared to the corresponding values obtained by the constant speed extrusion model with velocity of 5 mm·s-1. The good surface quality, the tiny and uniform metallographic structure and the high mechanical properties of aluminum alloy square tube are obtained.

基金项目：

广西自然科学基金资助项目（2013GXNSFAA019303)；广西有色金属及特色材料加工重点实验室开放课题基金项目（GXKFJ12-04）

杨志高(1988-），男，硕士研究生

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