微細深穴加工に対する低周波振動付加に関する研究

—振動条件最適化の検討—

抄録

In high-aspect-ratio microdrilling, the optimization of low-frequency vibration conditions was examined. We estimated vibration conditions in terms of the chip disposal, cooling effect and cutting force. First, we calculated cutting time by the formulation of the relationship between the rotational angle of cutting edge and the axial displacement. We focused on cutting time ratio and positive velocity ratio. Cutting time ratio represents the ratio of cutting time to vibration period. Positive velocity ratio represents the ratio of time of positive velocity to cutting time. Furthermore, we mapped the cutting time ratio or the positive velocity ratio by the combination of frequency ratio and amplitude ratio. A strong correlation between these ratios and tool wear was confirmed by high-aspect-ratio microdrilling experiments assisted by low-frequency vibration.