Numerical analysis and optimal design of the breechblock mechanism

This article is devoted to the structural design of the breechblock mechanism. The impact force between the driven cam and the cartridge is an important factor that affects the gun cartridge extraction speed and breech strength. The impact force is deduced with the theoretical solution, numerical solution, and test method in this article, and the analysis results are verified through experiments. Then, dynamic analysis is carried out for the breechblock based on the obtained results. The stress distribution is obtained using the Automatic Dynamic Analysis of Mechanical Systems software and experiments. The maximum stress of the impact parts exceeds the fatigue limit stress of the material, so the structure optimization should be performed. In this article, the stopper optimization is discussed in detail. To improve the energy absorption characteristics of the stopper, an optimization method is presented. The topology optimization, slot clearance optimization, and shape optimization of the stopper are performed. Moreover, the stopper structure size, strength, stiffness, and the specific energy absorption before and after optimization are compared. The results of the experimental, analytical, and numerical investigations are compared in tables and figures.