埋头弹步枪导轨曲线槽的设计分析

Design and analysis of the curve groove of the guide rail of a rifle with cased telescoped ammunition

为研究不同导轨曲线槽形状对埋头弹步枪导轨-弹膛机构运动特性以及弹膛突耳与导轨曲线槽接触力的影响,以某中口径埋头弹步枪为对象,基于一次函数、二次函数、三次函数和五次多项式函数设计了4种导轨曲线槽,建立了相应的导轨-弹膛机构的三维模型,采用Adams建立了导轨-弹膛机构的虚拟样机模型,利用Abaqus建立了导轨-弹膛机构有限元模型,并进行了仿真研究与分析。仿真结果表明:选用不同导轨曲线槽时,活动弹膛升降速度、导轨曲线槽与突耳间的接触力、以及导轨曲线槽的接触应力明显不同,最大接触应力主要分布在导轨曲线槽起始位置和终止位置;选择五次多项式函数作为导轨轮廓曲线时,导轨曲线槽起始位置和终止位置的接触应力较其他导轨曲线槽的接触应力小。

In order to study the influence of different curve groove shapes of guide rail on the motion characteristics of the guide rail-chamber mechanism and the contact force between the chamber lug and the guide rail curve groove,a medium caliber cased telescoped ammunition rifle was selected as the object.Based on linear,quadratic,cubic,and quintic polynomial functions,four kinds of guide rail curve grooves were designed to establish a three-dimensional model of the corresponding guide rail-chamber mechanism.Adams was used to establish a virtual prototype model,and Abaqus was used to establish the finite element model of the guide rail-chamber mechanism.The corresponding simulations and analyses are conducted.The simulation research results show that when different guide rail curve grooves are used to drive the movable chamber,the up-and-down speed of the movable chamber,the contact force between the guide rail curve and the lug,and the contact stress of the guide rail curve grooves are obviously different,and the maximum contact stress is mainly distributed at the starting and ending positions of the guide rail curve groove,and that the contact stress of the starting position and end position of the guide rail curve groove is smaller than that of other rail curve grooves when the five-degree polynomial function is selected as the guide rail profile curve.