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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AZ80镁合金管材挤压工艺参数的制定、优化提供了科学依据。
The flow stress-strain curve of EW75 magnesium alloy was obtained by thermal simulation compression experiment. The material model was established by DEFORM-3D software and the numerical simulation of EW75 magnesium alloy anti-extrusion was carried out based on the rigid-plastic finite element method. The load-stroke curve and the distribution of stress, strain and velocity inside the billet were analyzed. The influence of extrusion temperature and extrusion speed on the anti-extrusion process was also analyzed. The simulation results show that the optimum process of anti-extrusion of EW75 magnesium alloy is deformation of 500 ℃ and extrusion speed of 5 mm / s. The simulation results provide a scientific basis for the formulation and optimization of extrusion process parameters of AZ80 magnesium alloy pipe.