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对等通道挤压-螺旋成型模型进行数值模拟计算,分析转角剪切与旋转剪切对AZ31镁合金在成型过程中等效应力、应变和挤压力的影响。结果表明:经等通道挤压-螺旋成型后,随螺旋长度、螺旋角度和螺旋凹槽深度的增加,试样所获得的等效应变更大,分布更均匀,AZ31镁合金的塑性应变值最高达2.1;随螺旋长度、螺旋角度增加,试样获得的等效应力更大,但随螺旋凹槽深度的增加,等效应力无明显变化,在等通道的转角区和螺旋变形的旋转区出现明显的应力集中。
The equivalent channel extrusion - spiral forming model was numerically simulated and the effect of corner shear and rotating shear on the equivalent stress, strain and squeezing force of AZ31 magnesium alloy during forming process was analyzed. The results show that with the increase of helical length, helix angle and helical groove depth, the equivalent strain obtained by the sample is larger and the distribution is more uniform. The plastic strain value of AZ31 magnesium alloy is the highest 2.1. With the increase of helical length and helical angle, the equivalent stress obtained by the specimen is larger. However, with the increase of helical groove depth, there is no obvious change of equivalent stress, which is obvious in the turn zone of helical groove and the rotation zone of helical deformation Stress concentration.