转膛自动机弹带二次挤进过程数值模拟

Numerical Simulation of Secondary Engraving Process of Revolver Automata Cartridge Band

为研究转膛自动机转膛衬套与身管衬套膛线不等高带来的弹带二次挤进问题,建立反映膛线高度差的弹带二次挤进过程分析有限元模型。通过数值仿真获得弹带完全挤进转膛衬套和身管衬套的应力、变形和温度;仿真结果与实弹射击回收的弹带刻痕吻合较好,说明所建立有限元模型具有一定的可信度。对比转膛衬套采用半高膛线与全高膛线的仿真结果表明:转膛衬套与身管衬套膛线不等高显著影响弹带挤进过程,采用半高膛线能使弹带挤入转膛衬套更平稳,但弹带在二次挤进身管衬套时会产生更强的冲击;采用全高膛线在弹带挤入转膛衬套时更困难,但在二次挤进身管衬套时较为平稳。

In order to study the secondary engraving problem caused by the unequal rifling height between the revolver bushing and the barrel bushing of revolver automata,a finite element model reflecting the rifling height difference was established to analyze the secondary engraving process of the belt.Through numerical simulation,the stress,deformation and temperature were obtained when the belt was completely squeezed into the revolver bushing and the barrel bushing.The simulation results were in good agreement with the notch of the belt recovered in live firing,which indicated that the established finite element model had a certain credibility.The simulation results show that the unequal height of the bore liner and the barrel liner has a significant effect on the belt squeezing process.The half-height bore liner can make the belt squeeze into the bore liner more smoothly,but the belt will produce stronger impact when it squeezes into the barrel liner for the second time;Full-height rifling is more difficult when the belt is squeezed into the revolver liner,but it is smoother when the belt is squeezed into the barrel liner twice.