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对镁合金正挤压-扭转成形进行了工艺参数的有限元模拟,分析了扭转剪切变形对AZ31镁合金在成形过程中等效应变和挤压力的影响。结果表明:随着挤压温度的降低,挤压速度和摩擦系数的升高,坯料所获得的等效应变显著升高。正挤压-扭转变形可以显著提高坯料变形过程的等效应变,并改善变形的均匀性。经正挤压-扭转变形后,AZ31镁合金的塑性应变高达4.5。工艺参数的有限元分析能为AZ31镁合金正挤压-扭转变形的实际生产提供重要参考。
The finite element simulation of the process parameters of positive extrusion-torsion forming of magnesium alloy was carried out. The effect of torsional shear deformation on the equivalent strain and compressive force of AZ31 magnesium alloy during forming process was analyzed. The results show that with the decrease of extrusion temperature, extrusion speed and friction coefficient, the equivalent strain obtained by the billet is significantly increased. Positive extrusion - torsional deformation can significantly improve the equivalent deformation of the blank strain, and improve the uniformity of deformation. After positive extrusion - after torsional deformation, AZ31 magnesium alloy plastic strain up to 4.5. The finite element analysis of process parameters can provide important reference for the actual production of AZ31 magnesium alloy under normal extrusion-torsional deformation.