埋头弹复合药筒抽壳闭气性能分析与改进设计

Performance Analysis and Improved Design of Cartridge Extracting and Sealing of Cased Telescoped Ammunitions

针对埋头弹药的闭气和抽壳问题,设计复合药筒方案,并对方案的闭气性能进行分析。分析结果表明:在最大380 MPa膛压下,药筒底座与筒体和闩体之间闭气性能良好,但端盖与身管之间闭气性较差,且筒体前端塑性变形较大,易出现抽壳后筒体破损。在此基础上,提出复合药筒改进方案,并与改进前方案进行对比分析。对比结果表明:端盖与身管之间有效接触面积增大,闭气效果明显改善,且筒体前端塑性变形明显变小,局部破损情况得到明显改善,膛压卸载后端盖与底座均与药室脱离,可实现几乎零抽壳力。

For the cartridge extracting and sealing of cased telescoped ammunitions,a structural concept of composite cartridge is designed,and the performance of cartridge extracting and sealing is analyzed.The results show that the performance of cartridge sealing among the cartridge base,cartridge cylinder and breechblock is good under a maximum chamber pressure of 380 MPa.But the performance of cartridge sealing between the end cap of the cartridge and the barrel is weak,and the plastic deformation of the front end of the cartridge cylinder is larger,which may result in the damage to cartridge cylinder after extracting.Based above,an improved structural scheme of the composite cartridge is put forward and compared with the former scheme.The results show that the effective contact area between the end cap and the barrel can be increased to improve significantly the performance of cartridge sealing.The plastic deformation of the front end of cartridge cylinder is significantly reduced,and the local damage condition is significantly improved.The end cap of cartridge and the cartridge base are both separated from the chamber after the chamber pressure unloading,which can lead to the result of almost zero extraction force.