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基于不同椭圆度凹模胀形原理,选择具有良好热稳定性和导热性能的甲基乙烯基硅橡胶作为黏性介质,进行AZ31B镁合金黏性介质温热胀形试验,并采用有限元分析软件ANSYS/LS-DYNA对成形过程进行分析。确定AZ31B镁合金黏性介质温热胀形最佳温度,以及凹模椭圆度对AZ31B镁合金黏性介质温热胀形变形规律的影响。同时根据网格应变原理,通过对不同椭圆度极限胀形试件的测量,绘制出AZ31B镁合金黏性介质温热成形极限图(FLD)。研究结果表明,在耐热温度范围内,热态黏性介质能够适应试件几何形状的变化建立非均匀压力场,非均匀压力差值随着椭圆度的增大而减小,根据极限胀形试验绘制出的成形极限图,能够综合反映出零件复杂程度与极限变形程度的关系。
Based on the principle of bulging of different ovality die, the methyl vinyl silicone rubber with good thermal stability and thermal conductivity was selected as the viscous medium. The hot deformation test of AZ31B magnesium alloy was carried out. The finite element analysis software ANSYS / LS-DYNA analysis of the forming process. The optimum temperature of hot deformation of AZ31B magnesium alloy viscous medium and the effect of die ellipticity on the thermal deformation of AZ31B magnesium alloy viscous medium were determined. At the same time, according to the principle of grid strain, the thermoforming limit map (FLD) of AZ31B magnesium alloy viscous medium was drawn by measuring the ultimate ellipticity bulging specimens. The results show that in the temperature range, the thermal viscous medium can adapt to changes in the geometry of the specimen to establish a non-uniform pressure field, the non-uniform pressure difference decreases with the increase of ovality, according to the ultimate bulging The plot of the forming limit drawn by the experiment can comprehensively reflect the relationship between the complexity of the part and the degree of ultimate deformation.