EW75镁合金反挤压成形的有限元模拟
FEM simulation of backward extrusion process of EW75 magnesium alloy
王献文，陈丽芳，张越，林海涛，袁家伟，李婷，张奎，李兴刚
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作者单位：西南铝业（集团）有限责任公司;
北京有色金属研究总院
中文关键字：EW75镁合金；反挤压；数值模拟
英文关键字： EW75 magnesium alloy; backward extrusion; rigid-plastic finite element
中文摘要：通过热模拟压缩实验得到EW75镁合金的流动应力—应变曲线，应用DEFORM-3D软件建立材料模型。基于刚塑性有限元法，对EW75镁合金反挤压过程进行数值模拟。分析了挤压过程的载荷—行程曲线，以及坯料内部的应力、应变、速度等分布，并对挤压温度和挤压速度对反挤压过程的影响做了分析。模拟结果表明：EW75镁合金的反挤压最佳工艺为变形为500 ℃，挤压速度为5 mm/s。模拟结果为果为AZ80镁合金管材挤压工艺参数的制定、优化提供了科学依据。
英文摘要：The flow stress-strain curves of EW75 magnesium alloy were obtained by the hot simulated method, and the material model was built by the software DEFORM-3D. Based on rigid-plastic finite element method, backward extrusion process of EW75 magnesium alloy was simulated numerically. The load-stroke curve of extrusion process and the distribution of stress and strain of the billet were analyzed. The effects of the extrusion process parameters，such as deformation temperature and extrusion speed on the distribution of the stress field and strain field were discussed. The results shows that the best technology of the backward extrusion of EW75 magnesium alloy was extrusion speed 5 mm/s at 500 ℃ On the basis of the simulation results，scientific evidences are provided to build and optimize the process parameters of back extrusion of EW75 magnesium alloy.