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在现有真空系统的基础上,通过优化压铸工艺参数以提高模具型腔的真空度,降低压铸件内部的孔隙率,同时提供了一种依据压铸工艺参数计算理论抽真空时间的方法。按照该方法计算的理论时间与实际值的偏差度小于12%。AZ91D镁合金的伸长率随真空度的提升而提高,在17.5kPa真空度下的压铸件伸长率相比普通压铸提高近70%,真空度达到25kPa后继续提升,伸长率的增长速率逐渐减小,在25~30kPa的真空度范围内压铸,具有较高的工业应用价值。
Based on the existing vacuum system, the process parameters can be optimized to improve the vacuum degree of the die cavity and reduce the porosity of the die casting. Meanwhile, a method of calculating the theoretical vacuuming time according to the die casting process parameters is provided. The deviation between the theoretical time calculated according to this method and the actual value is less than 12%. The elongation of AZ91D magnesium alloy increases with the increase of vacuum degree. The elongation of die-casting in vacuum degree of 17.5kPa increases nearly 70% compared with that of ordinary die-casting, and then continues to increase after the degree of vacuum reaches 25kPa. The growth rate of elongation Gradually reduced, in the vacuum range of 25 ~ 30kPa die-casting, with high industrial application value.