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为研究熔铸工艺对药柱质量的影响,采用数值模拟方法预测了熔铸装药过程中药柱内缩孔、缩松的形成情况。模拟不同浇注温度下缩孔、缩松的大小,分析其形成原因,模拟弹体下部水冷+冒口弹体上部预热保温法对药柱缩孔、缩松的消除效果。结果表明:能够保证液体炸药充满药室的最低浇注温度为最佳,弹体下部水冷+冒口弹体上部预热保温法可以有效减少缩孔、缩松;当预热温度为80℃,能够完全消除药柱内的宏观缩孔、缩松缺陷。
In order to study the influence of the casting process on the quality of the pellets, the numerical simulation method was used to predict the formation of shrinkage and shrinkage in the pellets during the casting process. The shrinkage and shrinkage were simulated under different pouring temperatures. The reasons for the formation of shrinkage and shrinkage were analyzed. The effect of preheating and keeping warm on the lower part of the shell and riser was simulated. The results show that the lowest pouring temperature of the liquid explosives filling the chamber is the best. The upper part of the water-cooled + riser preheating and holding method can effectively reduce the shrinkage cavity and shrinkage. When the preheating temperature is 80 ℃, Complete elimination of macroscopic shrinkage within the column, shrinkage defects.