Changes in the Characteristic Parameters of a Small-caliber Rifle in Fugitive Dust Life Test

doi:10.12382/bgxb.2023.0852

Abstract

Abstract:

The fugitive dust environment has an important impact on the performance and reliability of firearms, and the whole gun life test is carried out to obtain the change law of firearm characteristic parameters and analyze the causes according to the fugitive dust emission test standards specified. The high-speed photography and light curtain target are used to record the changes of the initial speed, firing rate, and characteristic point speed of firearm, and analyse and explain the influence of the parameter changes on the performance degradation of rifle. The test rifle is set as a control group to analyse the maintenance effect of rifle on the maintenance of firearm performance. The test results show that the pre-pressure and free length of the spring in the fugitive dust environment show a decreasing trend with the increase in the amount of projectiles, but the stiffness of spring does not change significantly, and at the same time, the performance degradation magnitude of the piston spring is greater than that of the recoil spring, which in turn is greater than that of the hammer spring.The rifle has an obvious phenomenon of hanging copper with the increase in the amount of projectile, which leads to the change inthe structural parameter of guide chamber. The wear of friction pair leads to an increase in the motion gap between the components, but oiling slows down this degradation. Based on the full-gun life test, the experimental validation is provided for clarifying the influence mechanism of motion characteristics and failure of automatic mechanismin the fugitive dust environment, and the data support is provided for researching the change rule of small-calibre rifleperformance.

Key words: rifle, fugitive dust environment, performance degradation, automaton movement characteristic, firearms reliability

CLC Number:

TJ22

ZHOU Hao, GU Tongguang, YUAN Dawei, LIU Keyan, LI Pengchao, JIA Luyang, WANG Yongjuan. Changes in the Characteristic Parameters of a Small-caliber Rifle in Fugitive Dust Life Test[J]. Acta Armamentarii, 2024, 45(10): 3732-3743.

Figures/Tables 28

References 28

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设备名称	原理(简要)	作用
Phantom高速摄影系统	以高频率对被测运动进行拍照,通过图像识别和处理获得位移、速度	测量自动机位移、速度物理量
高清2k工业CCD光学显微镜	利用光学成像原理,将图像光信息量经照相镜头传递给计算机	记录导轨表面颗粒附着情况
扬尘环境模拟装置	利用输沙设备与风机设备营造特定浓度与风速的扬尘环境	模拟扬尘环境
XGK-2002型光幕靶	通过光电探测器接收到的光通量的变化信号计算弹丸经过两个光幕的时间得到弹丸速度	测量弹丸初速
Vma-LF-2018型武器射频分析系统	根据连发弹丸经过光幕靶的时间次序计算连发平均射频	测量射击频率
弹簧拉压试验机(三和仪器,SD-50-500)	对试验材料施加压力,材料发生最大形变时,系统记录下试验材料的最大弹性参数	测量弹簧的性能参数

设备名称	原理(简要)	作用
Phantom高速摄影系统	以高频率对被测运动进行拍照,通过图像识别和处理获得位移、速度	测量自动机位移、速度物理量
高清2k工业CCD光学显微镜	利用光学成像原理,将图像光信息量经照相镜头传递给计算机	记录导轨表面颗粒附着情况
扬尘环境模拟装置	利用输沙设备与风机设备营造特定浓度与风速的扬尘环境	模拟扬尘环境
XGK-2002型光幕靶	通过光电探测器接收到的光通量的变化信号计算弹丸经过两个光幕的时间得到弹丸速度	测量弹丸初速
Vma-LF-2018型武器射频分析系统	根据连发弹丸经过光幕靶的时间次序计算连发平均射频	测量射击频率
弹簧拉压试验机(三和仪器,SD-50-500)	对试验材料施加压力,材料发生最大形变时,系统记录下试验材料的最大弹性参数	测量弹簧的性能参数

周期与变化幅度	自由长度/ mm	预压力/N	工作压力/ N	刚度/ (N·mm^-1)
初始	348(353)	26.35(26.25)	52.6(52.15)	0.208(0.21)
第18周期	342(346)	20.53(21.36)	46.38(46.4)	0.205(0.209)
变化幅度/ %	-1.72 (-1.98)	-22.09 (-18.63)	-11.83 (-11.03)	-1.44 (-0.48)

周期与变化幅度	自由长度/ mm	预压力/N	工作压力/ N	刚度/ (N·mm^-1)
初始	348(353)	26.35(26.25)	52.6(52.15)	0.208(0.21)
第18周期	342(346)	20.53(21.36)	46.38(46.4)	0.205(0.209)
变化幅度/ %	-1.72 (-1.98)	-22.09 (-18.63)	-11.83 (-11.03)	-1.44 (-0.48)

周期与变化幅度	自由长度/ mm	预压力/N	工作压力/ N	刚度/ (N·mm^-1)
初始	66(65)	4.07(4.08)	17.29(14.93)	0.541(0.48)
第18周期	60(60)	0.18(0.79)	12.24(11.78)	0.534(0.486)
变化幅度/%	-9.09 (-7.69)	-95.58 (-80.64)	-29.21 (-21.1)	-1.29 (1.25)