Abstract
Aiming at the problems of long movement stroke and complicated driving of the automatic machine breech block during the launching process of ammunition with large fineness ratio, it is proposed to use a crossed cam to drive the automata to complete the shooting progress. The three-dimensional model of the cam drive mechanism was established, and the maximum pressure angle of modified-sine curve and SMS-3 curve were compared according to the motion characteristics of the mechanism; the multi-rigid body dynamics and dynamics simulation software were used to obtain simulated displacement, speed and driving torque, and compared with the theoretical value. The simulation results show that under the same input conditions, the input torque required to complete the automata transport process using modified-sine curve is relatively small. This result provides a certain technical support for the research of automata on ammunition with large fineness ratio.
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