Abrasion Lives Simulation and Prediction of Key Parts for Breech Mechanism Based on Pro/E and ADAMS

Breech mechanism serves to close the breech, fire the ammunition and extract the cartridge case in firing process. In firing process, breech mechanism completes complicated actions, bears tremendous impact forces and produces huge percussive forces between components. Its major fault mode is grain abrasion caused by dry sliding friction. There are no feasible and practical technologies to simulate and predict the abrasion failure life of key parts for breech mechanism. A new simulation and prediction method is firstly put forward in this paper. Based on Pro/E and ADAMS, the virtual prototype of breech mechanism of semiautomatic vertical sliding-wedge type is established. To validate its precision and affectivity, qualitative and quantitative verification methods are adopted to check the virtual prototype of breech mechanism. Virtual prototype produces key parts’ load spectrums and failure thresholds. Dry sliding friction and abrasion experiment provides abrasion rules of typical materials. Finial simulation and prediction results are given as abrasion thresholds and operating items, which provides sufficient references for breech mechanism’s maintenance and safeguard.