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工艺参数对AZ31镁合金往复挤压过程的影响
引用本文:刘君,郭学锋,张忠明,叶永南. 工艺参数对AZ31镁合金往复挤压过程的影响[J]. 材料工程, 2012, 0(5): 70-75
作者姓名:刘君  郭学锋  张忠明  叶永南
作者单位:1. 西安理工大学材料科学与工程学院,西安,710048
2. 河南理工大学材料科学与工程学院,河南焦作,454000
基金项目:教育部博士点基金(20070700003);河南省科技攻关项目(102102210031);陕西省科技计划项目(2010K10-08);河南省教育厅自然科学项目(2010A430008)
摘    要:运用刚黏塑性有限元法对不同工艺参数下的AZ31镁合金往复挤压过程进行了热力耦合数值模拟,研究了不同初始坯料温度、挤压速率和摩擦因数对往复挤压过程中等效应变、等效应力及温度场的影响。结果表明:在往复挤压过程中,挤压速率对等效应变峰值影响不大,随着挤压速率的增大,工件内温度峰值直线上升,温度分布不均匀程度增大,应力峰值先增加后减小;随着初始坯料温度升高,等效应力峰值呈直线趋势减小;摩擦因数对温度峰值的影响很小,随着摩擦因数的增大,等效应变峰值先增大然后趋于平稳,等效应力峰值增大,其增大幅度减小。

关 键 词:往复挤压  工艺参数  AZ镁合金  数值模拟

Influences of Processing Parameters on Reciprocating Extrusion Process of AZ31 Magnesium Alloy
LIU Jun , GUO Xue-feng , ZHANG Zhong-ming , YE Yong-nan. Influences of Processing Parameters on Reciprocating Extrusion Process of AZ31 Magnesium Alloy[J]. Journal of Materials Engineering, 2012, 0(5): 70-75
Authors:LIU Jun    GUO Xue-feng    ZHANG Zhong-ming    YE Yong-nan
Affiliation:1(1 School of Materials Science and Engineering,Xi’an University of Technology, Xi’an 710048,China;2 School of Materials Science and Engineering, Henan Polytechnic University,Jiaozuo 454000,Henan,China)
Abstract:The rigid visco-plastic finite element method was used for the study on the coupling thermal-mechanical numerical simulation of reciprocating extrusion process of AZ31 magnesium alloy.The influence of initial temperature of blank,extrusion velocity and friction factor on the equivalent strain,equivalent stress and temperature field of reciprocating extrusion process was investigated.The results show that the extrusion velocity has little effect on the peak value of equivalent strain,with the increasing of the extrusion velocity,the peak value of temperature within the workpiece ascends linearly,the temperature distribution becomes more inhomogeneous,while the peak value of stress first increases and then decreases.With the increasing of initial blank temperature,the peak value of equivalent stress decreases linearly;and the friction factor has little effect on the peak value of temperature;with the increasing of friction factor,the peak value of equivalent strain first increases and then remains stable,and the peak value of equivalent stress increases with decreasing amplitude.
Keywords:reciprocating extrusion  processing parameter  AZ31 magnesium alloy  numerical simulation
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