【摘要】 为减少熔铸炸药的装药缺陷、提高装药密度，设计制造了一套高压熔铸成型系统，采用与典型TNT基和DNAN基熔铸炸药物理性质相近的惰性代料开展高压熔铸成型试验，研究加载压力、保压时间和加压时机对代料药柱相对密度和装药质量的影响。结果表明，高压熔铸成型过程中，除液相补缩作用被增强外，还存在糊状补缩和固相补缩作用，从而显著减少药柱的装药缺陷，提高相对密度；加载压力应在药柱的三轴压缩屈服强度和三轴压缩抗压强度之间；保压时间应超过药柱的凝固耗时；加压时机的温度应保证模具内壁尚未出现凝固层；加载压力25.45MPa、保压时间60min、加压时机80℃工况下制得的药柱无装药缺陷，相对密度高达99.90%。更多还原

【Abstract】 A high-pressure molding system was designed to reduce defects and improve the density of melt-cast explosives. Simulant composites with physical properties similar to typical TNT-based and DNAN-based melt-cast explosives were used in high-pressure molding experiments to investigate the effect of loading pressure, holding time and loading timing on the relative density and casting quality of the charge. The results show that in addition to the liquid feeding, there are also semi-solid feeding and solid feeding during the high-pressure molding process, which significantly reduces defects and increases relative density of charge. The loading pressure should be set between the triaxial compressive yield strength and ultimate strength of the charge; the holding time should exceed the solidification time of charge; the loading timing should ensure that there is no solidified layer in the mold. The simulant composites charge with the loading pressure of 25.45MPa, the holding time of 60min and the loading timing related internal temperature of 80℃ has no defects and the relative density reaches as high as 99.90%.更多还原