方管铝型材梯温优化及等温挤压金属流变的数值模拟  

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

作　　者：徐永礼[1] 王玉文[2] 庞祖高[2] 黄尚猛[3] 杨志高[2] 

机构地区：[1]广西水利电力职业技术学院,广西南宁530023 [2]广西大学材料科学与工程学院,广西南宁530004 [3]广西机电职业技术学院,广西南宁530007

出　　处：《锻压技术》2014年第11期33-38,共6页Forging & Stamping Technology

基　　金：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)

摘　　要：基于Hyper Xtrude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 Hyper Xtrude 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-1to 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.

关 键 词：等温挤压 金属流变 数值模拟 正交试验 

分 类 号：TG379[金属学及工艺—金属压力加工]