AZ31镁合金管材挤压过程的数值模拟

采用Gleeble1500热模拟机对于不同温度和变形速率下的AZ31镁合金的变形性能进行了研究。通过实验得到真实应力的关系式及真实应变关系式，进而得到真实应力-应变曲线。以此为基础，采用DEFORM-3D软件，对不同壁厚管材的成形的过程进行模拟，发现在挤压时，管材内壁的金属比外壁的金属流动快，挤压筒与圆锥面过渡处的等效应变值最大等现象，分析了产生的原因，并通过工艺试验验证了模拟分析的正确性。

Numerical simulation of extrusion process of AZ31 magnesium alloy tubes

The rheology performance of AZ31 magnesium alloy under different temperature ranges and at different forming rates is explored in the experiments using Gleeble1500 thermo-simulator. Through the experiment, the relation formula of real stress , real strain and the curve of stress and strain are achieved. Based on this, using DEFORM-3D software, the simulation of tube forming process of different wall thickness are carried out. It is found that the metal flow of the inner wall is faster than that of the outer wall during the tube extrusion and the equivalent strain value is the biggest at transition place from the extruded section to taper face. The correctness of simulating analysis is verified by analyzing the reason and through the process experiment.