锻压技术

方管铝型材梯温优化及等温挤压金属流变的数值模拟

英文标题：Numerical simulation of aluminum alloy square tube gradient temperature optimization and metal rheology of isothermal extrusion process

作者：徐永礼王玉文庞祖高黄尚猛杨志高

单位：广西水利电力职业技术学院广西大学广西机电职业技术学院

关键词：等温挤压金属流变数值模拟正交试验

分类号：TG376

出版年,卷(期):页码：2014,39(11):33-38

摘要：

基于HyperXtrude瞬态分析，对方管铝型材进行四因素四水平正交试验获取的120 ℃的最优梯温进行模拟。结果表明，挤压塑性升温与坯料减小形成的温差刚好达到平衡状态，基本保证模具出口处于5 ℃温差的等温挤压状态，型材出口速度分布流速均方差由非等温状态的3.263 mm·s-1减少到0.362 mm·s-1，型材变形量也从1.690 mm减少为0.054 mm，坯料变形区轴向各层面温度分布呈阶梯状，越接近模口变形区温度、流速、变形程度越均匀。

Based on HyperXtrude transient analysis, 120 ℃ optimal gradient temperature obtained by four factors and four levels orthogonal experiment for the aluminum alloy square tube was simulated. The results show that at the die exit there maintains a temperature difference of 5 ℃ under isothermal extrusion condition when extrusion plastic heating temperature difference balances with the reduced temperature of billet. The mean-square deviation of profile exit velocity reduces from 3.263 mm·s-1 to 0.362 mm·s-1, and the deformation of profile reduces from 1.690 mm to 0.054 mm. The temperature distribution of axial section presents a stepped shape in deformation zone of the billet. The temperature, velocity and deformation degree of the deformation zone get more uniform when it is closer to the die exit.

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）

徐永礼 (1956-)，男，学士，副教授

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