155mm火炮不同膛线结构与弹带作用力研究

Study on force of different rifling structures and rotating band of 155mm artillery

火炮射击过程中,弹丸弹带与内膛表面发生过盈挤进、高速摩擦,使得膛线表面承受较大的压力而产生磨损,且膛线的不同位置磨损量差异较大,因此,研究弹带与身管膛线不同部位的作用力对分析身管内膛磨损量具有重要意义。以155 mm火炮身管为研究对象,针对现役等齐深、混合深及等齐浅3种膛线形式,研究建立了弹炮耦合碰撞动力学模型,分析了弹丸膛内运动过程弹带与膛线表面接触力沿身管轴向的变化规律,对比了不同膛线形式对膛线表面接触力及磨损量的影响。结果表明:在直膛起始部1英寸区域内,等齐深及混合深膛线身管的阳线上表面受力明显高于等齐浅膛线,而二者在阴线上表面的受力则小于等齐浅膛线;由实测数据可知,等齐深、混合深膛线起始部单发平均磨损量分别比等齐浅多了38.3%、36.2%,从而验证了理论计算的准确性。

During the artillery fire,interference extrusion and high-speed friction occur between the rotating band and the bore surface,which causes the rifling surface to bear greater pressure and wear,and the wear of rifling varies greatly at different positions.Therefore,it is of great significance to study the force of different parts of rotating band and rifling of barrel to analyze the bore wear.Taking the barrel of a 155 mm gun as the research object,for the three rifling forms of equal deep rifling,mixed deep rifling and equal shallow rifling,the dynamic response model of projectile and gun coupling collision was established.The variation law of contact force between rotating band and rifling surface along the axial direction of barrel was analyzed.The influence of different rifling forms on contact force and wear of rifling surface was compared.The result show that inside the first inch of the straight bore,the positive surface stress of equal and mixed deep rifling is obviously higher than that of equal shallow rifling,while that of negative is lower than that of equal shallow rifling.According to the measured data,the average wear amount of single shot at the beginning of rifling of equal deep and mixed deep is 38.3%and 36.2%higher than that of equal deep,respectively.Thus,the accuracy of theoretical calculation is verified.