炸药粉末压制工艺参数对药柱质量的影响

Influence of Process Parameters of Explosive Powder Pressing on the Quality of Grains

为了提高炸药粉末的压制成型质量,采用将炸药粉末视为连续体的建模方法,利用Shima-Oyane材料模型,以Φ26mm×22mm的JO-9159炸药药柱为例,采用高级非线性Msc.Marc建立了粉末压制过程仿真模型,分析了不同位置粉末位移及相对密度变化规律,研究了压制速率、初始密度对炸药粉末成型后相对密度及回弹量的影响。结果表明,Shima-Oyane材料模型可以较好地模拟粉末压制成型过程;炸药粉末流动的方向主要为轴向流动,与模具接触区域流动相对缓慢;压制速率以及初始密度影响炸药粉末成型后的质量,初始相对密度的提高有助于提高炸药粉末成型后的质量;压制速率在230~250mm/s时,粉末成型后相对密度较为均匀、回弹量较小,即粉末成型质量较好。

To improve the quality of explosive powder press molding,taking the JO-9159 explosive column with size ofΦ26mm×22mm as an example,a modeling method that regards explosive powder as a continuum was adopted,and the Shima-Oyane material model and advanced nonlinear Msc.Marc were applied to build a simulation model of the powder pressing process.The variation of powder displacement and relative density at different locations was analyzed,and the effects of pressing rate and initial density on the relative density and springback amount of explosive powder after molding were also researched.The results show that the Shima-Oyane material model can simulate the powder pressing process well.The flow between the explosive powder and the mold contact area is relatively slow,the pressing rate and the initial density affect the quality of the explosive powder after molding,and the increase in initial relative density helps to improve the quality of explosive powder after molding.When the pressing rate is in the range of 230—250mm/s,the relative density of the powder after molding is relatively uniform and the springback amount is small.Therefore,the quality of powder molding is better.