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采用Ansys软件建立了等通道转角挤压的有限元模型,对不同模具角度条件下等通道转角挤压过程进行了模拟,获得了摩擦应力、试样与模具内部应力与应变随模具角度的变化。以AZ31镁合金为试验对象,进行了等通道转角挤压试验,对模拟分析结果与试验结果进行了对比。结果表明,等通道转角挤压过程中试样与模具表面会产生较大摩擦应力,导致试样与模具内应力与应变分布不均匀,摩擦应力、材料内部应力及应变随着模具角度增加而减小。挤压后AZ31镁合金微观组织被细化,理论分析结果与试验结果一致。
Ansys software was used to establish the finite element model of isotropic channel corner extrusion. The isotropic extrusion process was simulated under different die angles, and the friction stress, the change of internal stress and strain with the die angle were obtained. Taking AZ31 magnesium alloy as the test object, the equal-channel corner squeeze test was carried out, and the simulation analysis results and the test results were compared. The results show that the sample and the mold surface will have a large frictional stress during the process of isotropic channel extrusion, resulting in the uneven distribution of stress and strain in the sample and the mold. The frictional stress, internal stress and strain of the material decrease with the increase of the mold angle small. The microstructures of AZ31 magnesium alloy after extrusion are refined, and the theoretical analysis results are consistent with the experimental results.