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| Reliability Analysis of an Automatic Rifle Firing-mechanism Based on FMECA |
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| DOI：10.7643/issn.1672-9242.2022.06.006 |
| KeyWord:firing-mechanism reliability analysis FMECA exceedance insurance abnormal firing task reliability, basic reliability |
| Author | Institution |
| LI Ding-zhe |
School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing , China |
| JING Chun-wen |
Chongqing Jianshe Industry Group Co., Ltd., Chongqing , China |
| GUAN Xiao-rong |
School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing , China |
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| Abstract: |
| This paper aims to analyze the reliability of an automatic rifle firing-mechanism. The fault mode, impact and hazard analysis (FMECA) was used to analyze the hazard degree of automatic weapon launching mechanism. By referring to GJB-450a and GJB1391, a reference standard for evaluating the degree of damage was formulated and the fault was listed, as well as the degree of damage of the fault was scored, thereby identifing the fault with the most serious impact and conducting reliability analysis with it preferentially. Then, the dynamic simulation of the launching mechanism was carried out by using 3D modeling software and dynamics analysis software, and the results of dynamics simulation were imported into the finite element simulation software. The maximum stress of the parts was obtained by mechanical analysis, and the reliability was calculated by using stress-intensity interference theory. Finally, the reliability analysis of serious faults is given. After FMECA analyzed the comprehensive score, it was concluded that the most serious failure mode of an automatic rifle firing-mechanism was the exceedance insurance abnormal firing. ADAMS simulation was used to conduct stress analysis, and the biggest stress parts in the launching mechanism were semi-automatic sear and hammer. The stress-intensity interference theory was used to calculate the reliability, and the basic reliability of semi-automatic sear was 99.952%, the basic reliability of hammer was 99.955%, and the basic reliability of the launching mechanism was 99.907%. The foundation reliability of launching mechanism is very high, so the main factor affecting the reliability of launching mechanism is the unreliability of mechanism motion. The abnormal operation of automatic weapons will lead to the abnormal position of parts, resulting in unreliable tasks. The failure can be prevented by improving parts and components to enhance the mission reliability of launch mechanism. |
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