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For it is hard to develop experiments for the gun breechblock system, a shock test bed is designed for it. During designing, the breechblock operating force is one of the key test parameters of the shock test bed for gun breechblock system. In order to choose a reasonable value to open breechblock, influence of breechblock operating force on breechblock operating works of shock test bed is analyzed. With the design principle determined, the dynamics principle model of the shock test bed is established based on the virtual prototype technology. According to the minimum theoretical force F, a standard value for shock test bed to open breechblock. As both the mass of breechblock operating cam and the breechblock operating distance are fixed, the simulation experiments are performed based on the principle model when the breechblock operating force is F, 1.5F, 2F, 2.5F and 3F separately. The results show that the greater breechblock operating force is, the more total work, useful work and useless work have been done. But the wasted energy of work will increase. By the research, it is better to choose a less value of breechblock operating force.

Influence of Breechblock Operating Force on Work of Shock Test Bed for Gun Breechblock System