摘要
采用基于任意拉格朗日—欧拉(Arbitrary Largrang-Euler,ALE)算法的HyperXtrude软件模拟带有细小特征的薄壁空心铝型材挤压过程,以模孔出口处材料流速均方差作为衡量其均匀性的指标,通过设计一系列阻流块有效控制材料流速及型材变形。研究阻流块对流速均匀性的影响规律,提出阻流块设计的一般原则。结果表明,阻流块的截面形状对流速控制起着关键作用,应保证阻流块截面形状合理,再调整阻流块高度及其到模孔的距离,可有效控制材料流速及型材的变形,获得形状和尺寸符合要求的型材。在阻流块高度的一定范围内,增加其高度可增加型材整个截面上材料流速的均匀性,但阻流块的宽度对平衡材料流速作用不大。
The extrusion process of a thin-walled hollow aluminum alloy profile with small features is simulated by using arbitrary Largrang-Euler（ALE） algorithm based HyperXtrude software. The material flow velocity standard deviation in the exit of the die hole is used as a criterion to evaluate velocity uniformity. By designing a series of baffle-blocks, the material flow velocity and the deformation of extrudate are controlled effectively. Effect of baffle-blocks on velocity uniformity is analyzed and a design method of baffle-blocks is proposed. The simulation results demonstrate that the section shapes of baffle-blocks play a key role in controlling material flow velocity in exit. When baffle-blocks have a reasonable section shape, material flow velocity and the deformation of extrudate can be controlled effectively and qualified profiles can be gained by adjusting height and distance between baffle-blocks and mold hole. In a certain range of the baffle-block＇s height, the increase of the height of baffle-block can increase the uniformity of the materials flow velocity effectively. However, the increase of the width of baffle-blocks may not work on the balance of material flow material.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2012年第16期52-58,共7页
Journal of Mechanical Engineering
基金
国家科技支撑计划(2009BAG12A07-B01)
教育部长江学者和创新团队发展计划创新团队(IRT0931)资助项目
关键词
铝合金
挤压模具
数值分析
流速
Aluminum alloy Extrusion die Numerical analysis Flow velocity
作者简介
作者简介：喻俊荃，男，1987年出生。主要研究方向为材料成形与数值模拟。E—mail：yjq1688．happy@163．com
赵国群（通信作者），男，1962年出生，教授，博士研究生导师。主要研究方向为塑性成形理论与工艺。E—mail：zhaogq@sdu．edu．cn
