Finite element simulation of the effects of friction on the equal channel angular pressing for high-strength aluminum alloy

Cai Gangyi; Ma Zhuang; Lv Guangshu

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Finite element simulation of the effects of friction on the equal channel angular pressing for high-strength aluminum alloy
Issue S1, Pages: 531-534(2008)
Published： 2008 ，
DOI：

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[1]蔡刚毅,马壮,吕广庶.摩擦条件对高强铝合金ECAP变形作用的有限元模拟[J].特种铸造及有色合金,2008(S1):531-534.

Cai Gangyi, Ma Zhuang, Lv Guangshu. Finite element simulation of the effects of friction on the equal channel angular pressing for high-strength aluminum alloy. [J]. Special Casting & Nonferrous Alloys (S1):531-534(2008)
[1]蔡刚毅,马壮,吕广庶.摩擦条件对高强铝合金ECAP变形作用的有限元模拟[J].特种铸造及有色合金,2008(S1):531-534. DOI：

Cai Gangyi, Ma Zhuang, Lv Guangshu. Finite element simulation of the effects of friction on the equal channel angular pressing for high-strength aluminum alloy. [J]. Special Casting & Nonferrous Alloys (S1):531-534(2008) DOI：

摘要

应用三维金属塑性成形模拟软件DEFORM-3D

对高强铝合金等通道转角挤压（ECAP）变形过程中摩擦力的作用进行了有限元模拟。计算模拟结果表明

挤压过程中载荷-位移曲线可分为快速增加、载荷稳定、快速增加、载荷稳定及快速下降5个阶段。摩擦系数越大

变形载荷越大;摩擦系数从0到0.3

最大载荷增加了2.1倍

所消耗的功增加了1.3倍

摩擦条件下

载荷一部分用于克服摩擦阻力

一部分用于材料变形

增大了能耗

同时减少了模具使用寿命。此外摩擦系数大

材料平均等效应变基本不变

而芯部应变不均匀程度增大。因此在等通道转角挤压的过程中

应保证挤压凹模内壁表面光洁、使用合适的润滑剂

以减小摩擦

减小载荷

从而改善晶粒细化及组织的均匀性效果。

Abstract

Finite element simulation of the effects of friction on the equal channel angular pressing for high-strength aluminum alloy was conducted by using DEFORM-3D program. The results show that the work load ascended with the increasing of the friction coefficient. When the constant increased from 0 to 0.3

the maxium load increased by 2.1 times. One part of load overcome the friction and the other part is used for deformation of the sample. Therefore the energy is wasted

and mold life was reduced on the condition of friction. In addition

with the increasement of friction coefficient

the average effective strain keep steady value

and the degree of effective strain uniformatiy at the inner of the sample decreased. As mentioned above

in the course of ECAP deformation

the inner wall of the mold should keep slippy and the appropriate lubricant is choosed to decrease the friction and the load

then grian refinement and microsturcture uniformity will be improved.