身管冷径向锻造残余应力的模拟研究

身管是自动武器的核心部件，冷径向锻造是制造自动武器身管的一项新工艺。冷径向锻造后的身管通常需要后续的机械加工，且身管在动态的高温高压载荷下射击，锻后身管中的残余应力将直接影响身管后续加工中的尺寸精度及身管使用时的疲劳寿命。为了预测冷径向锻造身管内的残余应力分布及影响残余应力分布的各参数，建立了模拟身管的冷径向锻造及回弹过程的轴对称模型，得到了回弹后身管内的残余应力分布，并分析了各工艺参数对锻后身管内残余应力分布的影响规律，为进一步控制锻后身管内残余应力的分布提供了参考。

Simulation Study on Residual Stress in Cold Radial Forged Barrel

The barrel is a key part of automatic weapon. The cold radial forging process is a new technology for manufacturing the barrels. The cold radial forged barrels usually need to be machined further, and are used under dynamic high temperature and pressure conditions later. The dimensional accuracy in the barrel’s subsequent processing and its fatigue life are affected by residual stress in it, which is induced by cold radial forging. An axisymmetric model was established to simulate the cold radial forging process of barrel and the subsequent spring-back, the residual stress distribution in the barrel was obtained, and the effects of process parameters on the residual stress in the barrel were analyzed. The results can be used to control the residual stress in the forged barrel.