考虑零件变形的自动武器闭锁片偏移式闭锁机构弹底间隙分析  

Analysis of Headspace in Locking Mechanism with Locking Lug Shifting in Considering Part Deformation

作　　者：罗少敏[1] 徐诚[1] LUO Shao-min;XU Cheng(School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, Jiangsu, China)

机构地区：[1]南京理工大学机械工程学院,江苏南京210094

出　　处：《兵工学报》2018年第5期841-850,共10页Acta Armamentarii

基　　金：国防"十二五"基础科研项目(A1020131011)

摘　　要：弹底间隙是自动武器总装中典型的装配要求,直接影响到武器性能和安全。为研究实际工况下的自动武器弹底间隙,提出基于有限元分析的零件装配变形计算方法,建立了考虑变形的自动武器装配公差分析模型。针对某闭锁片偏移式机枪弹底间隙问题,建立了闭锁机构零件变形分析模型,分析了考虑温度引起变形下的弹底间隙变化,研究了不同温度对弹底间隙的影响,复进到位撞击引起的变形对弹底间隙的影响,以及发射过程中零件变形的影响。结果表明:考虑枪管弹膛温度引起的零件变形时,随着温度升高,弹底间隙分布中心发生明显偏移,分布范围收缩,弹膛温度在300~600℃时弹底间隙最大减小0.015 mm;考虑复进到位撞击引起变形时,弹底间隙增大0.02 mm;发射过程中闭锁机构零件弹性变形量为0.14 mm,考虑发射过程变形影响,当最大闭锁间隙为0.38~0.47 mm时弹壳不会发生横断,当最大闭锁间隙为0.47~0.48 mm时弹壳会发生横断。Headspace is a typical assembly requirement in automatic weapon assembly, which directly af- fects the performance and safety of automatic weapon. To research the headspace under actual working condition, a calculation method of part deformation based on finite element analysis is put forward, and an analysis model of assembly tolerance considering deformation is established. For the assembly accuracy of machine gun with locking lug shifting, an analysis model for locking mechanism is established, the as- sembly precision change of headspace in considering deformation caused by temperature is analyzed, and the influence of temperature on headspace is studied. The influence of deformation on headspace in counter-recoil and the influence of part deformation during the launching process are investigated. The re- suits show that the distribution center of headspace is obviously offset, and the distribution range contracts with the increase in temperature after considering the deformation induced by temperature. The headspace is decreased by 0. 015 mm in considering deformation at barrel chamber temperature of 300 - 600 ℃. Considering the deformation caused by the impact in counter-recoil, the headspace is increased by 0.02 mm. Elastic deformation of parts is 0. 14 cartridge case will not happen when headspace space is 0.47 -0.48 mm. mm during the launch process. The transverse fracture of is between 0.38 -0.47 mm, but, will occur when head-space is 0. 47 -0. 48 mm.

关 键 词：自动武器 闭锁机构 装配公差 弹底间隙 载荷影响 变形 

分 类 号：TJ203.2[兵器科学与技术—武器系统与运用工程]