战斗部顺序凝固装药过程数值模拟研究

Research on numerical simulation of sequential solidification charge process of warhead

针对某梯黑炸药熔铸装药工艺过程易出现缩孔缩松缺陷,采用ProCAST数值模拟软件,结合正交试验和灰色关联度分析对某战斗部的水浴顺序凝固装药工艺进行研究,分析了其特有工艺参数(水浴温度、水位上升速度)和冒口温度对药柱凝固时间和缩孔缩松缺陷的影响。结果表明:传统自然冷却工艺发生缩孔缩松缺陷的最大概率为41.5%,而同工艺参数条件下水浴顺序凝固工艺发生缩孔缺陷的最大概率为5.6%;相比水浴温度和冒口温度,水位上升速度是影响药柱凝固时间和缩孔缩松率的主要因素;从降低凝聚时间和缩孔缩松缺陷概率角度出发,最佳的工艺条件是水浴温度20℃,水位上升速度3.5×10^(-2) mm/s,冒口温度95℃,在此工艺条件下药柱的凝固时间为7981 s,发生缩孔缩松缺陷的概率为0.6%。

Aiming at the problem of shrinkage defects of RDX-TNT explosive,ammunition charging progress of water sequential solidification was researched by numerical simulation software ProCAST combined with orthogonal test and grey relational analysis.The effect on the temperature of water and casting head,ascent rate of water on the solidification time and shrinkage defects of explosive were explored.The results show that the maximum shrinkage probability of natural charging progress is 41.5%,while that of water sequential solidification is 5.6%at the same process conditions.Compared with the temperature of water and casing head,the ascent rate of water is the main factor affecting the solidification time and shrinkage defects.From the point of view of reducing solidification time and shrinkage defects,the optimum temperature of water and casting head is 20℃and 95℃,respectively,and the optimum ascent rate of water is 3.5×10^(-2) mm/s.Under the optimum process condition,the solidification time of explosive is 7981 s and the maximum shrinkage probability is 0.6%.