Abstract:  For studying the effects of axial LFVAD method on the feed forces in the cortical bone drilling processes, the comparative experiments of feed forces for whole drill bit and chisel edge were performed. The kinematics analyses and the transient machining processes of the cutting unit in LFVAD method were also studied. The experimental results show that, compared with conventional drilling(CD) method, the feed forces of whole drill bit and chisel edge in LFVAD method decrease about 60% and 60%~80% respectively with the same drilling parameters. According to the analyses of kinematics and the comparisons of typical morphology of bone chips, a periodic separation motion between the drill bit and workpiece may be achieved in LFVAD method with the specific drilling and vibration parameters. This motion may significantly change the transient machining processes. This motion may be one of the main reasons for the feed force reduction.

Key words: bone drilling, low-frequency vibration-assisted drilling（LFVAD）, kinematics analysis, transient machining, feed force

摘要： 为了研究轴向低频振动辅助钻削方式在皮质骨钻削过程中对进给力的影响，对全钻头和横刃部分进给力进行了对比试验，并对切削刃切削单元的运动学和瞬时加工过程进行了分析。对比试验结果表明：在相同的钻削参数下，与常规方式相比，轴向低频振动钻削方式的全钻头进给力最大可减小约60%，横刃部分进给力可减小60%~80%。依据运动学分析和典型骨屑形态对比可以得出：在特定的钻削参数和振动参数配合下，轴向低频振动钻削方式可以实现钻头工件周期性分离运动，显著影响瞬态加工过程，是进给力显著减小的主要原因之一。

关键词: 骨钻削, 低频振动辅助钻削, 运动学分析, 瞬态加工, 进给力