Research on the Influence of Salt Spray Environment on the Movement of Typical Rifle Automaton

doi:10.12382/bgxb.2022.0924

Abstract

Abstract:

Salt spray environment has an important influence on the tactical and technical performance and operational effectiveness of automatic rifles. However, the influence mechanism of salt spray environment on the motion characteristics and failure of rifle automaton is still unclear. A small caliber automatic rifle is taken as the test object,and a life-test in salt spray environment is designed and carried out. A series of measurements and records are carried out on the rifle after each salt spray test, including non-contact measurement of automaton motion by high-speed photography, high precision measurement of the mass of rifle bolt, recoil spring parameters test, and photographic record of bolt box and guide rail surface morphology characteristics. The conditions of failure during the life-test are counted to obtain the typical fault patterns of automaton movement. The results show that the mass of rifle bolt increases gradually with the increase in salt spray test time. The free length and pre-pressure of the recoil spring gradually decrease, and the working pressure tends to be flat after decreasing. The speed at which the bolt carrier recoils to position decreases first and then increases. The speeds at which the bolt begins to return and returns to the original position decrease gradually, and they have the same changing trend. With the decrease of the speed at which the bolt carrier recoils to position, the number of motion faults of the automaton increases, and the multi-parameter changes caused by the salt spray environment have an obvious influence on the automaton motion. Based on the experimental study, the quantitive relation formulas for the changes of the mass of rifle bolt, the recoil spring parameters and the characteristic point velocity with time are built. Quantitive relation formulas provide a reference for inferring the parameter changes of moving parts of automaton in salt spray environment and analyzing their influences on faults in motion.

Key words: small caliber rifle, salt spray life test, motion of automaton, parameters change, failure analysis

CLC Number:

TJ22

ZHANG He, HUANG Yi, LIU Keyan, LI Pengchao, GU Tongguang, WANG Yongjuan, XU Cheng. Research on the Influence of Salt Spray Environment on the Movement of Typical Rifle Automaton[J]. Acta Armamentarii, 2024, 45(4): 1082-1093.

Figures/Tables 21

References 20

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盐雾时间/h	枪机框质量/g		枪机框质量平均值/g
盐雾时间/h	样本1	样本2	枪机框质量平均值/g
0	400.520	400.720	400.620
48	400.620	400.960	400.790
72	400.760	400.940	400.850
120	400.790	400.990	400.890
144	400.940	400.960	400.950
192	400.920	400.990	400.955
216	400.950	401.100	401.025
264	400.970	401.120	401.045
288	400.930	401.170	401.050
336	401.070	401.200	401.135
360	401.180	401.300	401.240

盐雾时间/h	枪机框质量/g		枪机框质量平均值/g
盐雾时间/h	样本1	样本2	枪机框质量平均值/g
0	400.520	400.720	400.620
48	400.620	400.960	400.790
72	400.760	400.940	400.850
120	400.790	400.990	400.890
144	400.940	400.960	400.950
192	400.920	400.990	400.955
216	400.950	401.100	401.025
264	400.970	401.120	401.045
288	400.930	401.170	401.050
336	401.070	401.200	401.135
360	401.180	401.300	401.240

盐雾时间/h	复进簧自由长度/mm		复进簧自由长度平均值/mm
盐雾时间/h	样本1	样本2	复进簧自由长度平均值/mm
0	360.00	360.00	360.00
48	358.00	356.00	357.00
72	354.00	355.00	354.50
120	356.00	354.00	355.00
144	353.00	352.00	352.50
192	353.00	352.00	352.50
216	353.00	351.00	352.00
264	353.00	351.00	352.00
288	351.00	351.00	351.00
336	352.00	351.00	351.50
360	349.00	349.00	349.00

盐雾时间/h	复进簧自由长度/mm		复进簧自由长度平均值/mm
盐雾时间/h	样本1	样本2	复进簧自由长度平均值/mm
0	360.00	360.00	360.00
48	358.00	356.00	357.00
72	354.00	355.00	354.50
120	356.00	354.00	355.00
144	353.00	352.00	352.50
192	353.00	352.00	352.50
216	353.00	351.00	352.00
264	353.00	351.00	352.00
288	351.00	351.00	351.00
336	352.00	351.00	351.50
360	349.00	349.00	349.00

盐雾时间/h	复进簧预压力/N		复进簧预压力平均值/N
盐雾时间/h	样本1	样本2	复进簧预压力平均值/N
0	25.80	27.35	26.58
48	25.48	25.45	25.47
72	25.00	25.00	25.00
120	23.80	24.20	24.00
144	23.72	24.04	23.88
192	23.81	24.20	24.01
216	23.80	24.15	23.98
264	23.54	23.53	23.54
288	23.15	23.59	23.37
336	22.68	22.38	22.53
360	22.75	22.25	22.50