小口径火炮身管振动铰削的实验研究

论文研究了振动铰削降低表面粗糙度的机理，在此基础上通过硬质合金铰刀振动铰削小口径火炮身管的实验，深入分析了振动铰削对火炮身管内膛表面粗糙度的影响。振动铰削把普通铰削的连续切削过程转变为断续的脉冲式切削过程，将普通铰削时的螺旋状连续切屑变成了非常细小的针状单元切屑．增强了铰削加工的断屑排屑能力，从根本上抑制了积屑瘤的形成，避免了已加工表面的犁沟和鳞刺。实验表明，振动铰削的表面粗糙度Ra比普通铰削至少提高三级，振动铰削的表面粗糙度彤值不到晋通铰削Ry值的1／14，振动铰削使孔的已加工表面均匀一致，显著提高了身管内膛的表面质量。

Study on Vibration Reaming Small Caliber Gun Tube

The mechanism of lowering surface roughness of vibration reaming is studied. The experiments of vibration reaming small caliber gun tube with cemented carbide reamer are carried out. The influence of vibration reaming on surface roughness of gun tube is analyzed in depth. The continuous cutting process of the conventional reaming is transformed into the pulsed intermittent cutting process so that the continuous helical chip of the conventional reaming is transformed into the minute acicular cell chip of the vibration reaming. The capability of chip-breaking and chip-removing of reaming is strengthened, therefore the formation of built-up edge is suppressed which avoids the generation of plough ditch and scales of hole surface. The experimental results indicate that the surface roughness Ra of the vibration reaming is enhanced at least 3 levels than that of the conventional reaming, and the surface roughness Ry is less than one-fourteenth of the conventional reaming. The surface finish of gun tube is greatly improved.