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以AZ91镁合金为研究对象,建立了等通道转角挤压三维模型。运用DEFORM-3D有限元软件进行了模拟,分析了温度和摩擦条件对AZ91等通道转角挤压过程中的等效应变、挤压力的影响。结果表明:试样在两通道转角处的变形较剧烈;随着温度的升高,等通道转角挤压所需要的最大挤压力变小;摩擦系数越大,等效应变变化梯度越大,塑性变形均匀性越低。
With AZ91 magnesium alloy as the research object, a three-dimensional model of isotropic channel corner extrusion was established. The finite element software DEFORM-3D was used to simulate the influence of temperature and frictional conditions on the equivalent strain and squeezing pressure during the corner extrusion process of AZ91. The results show that the deformation of the specimen at the corners of the two channels is more severe. The maximum squeezing force required by the isotropic channel cornering decreases with increasing temperature. The larger the friction coefficient, the greater the gradient of equivalent strain. The lower the plastic deformation uniformity.