小径貫通穴あけ加工時のバリや工具寿命に及ぼすキャビテーションの効果(第3報)

—工作液超音波振動法に関する研究—

抄録

Micro drilling is required in order to produce nozzles for fiber, fuel and so on. This paper deals with cavitation effects when applying ultrasonic vibration on machining fluid in micro through-hole drilling. In addition, burr and tool life are investigated when micro-drilling on SUS304 under various feed speeds. The obtained results are as follows. Cavitation occurs in a blister generated by machining fluid at the exit hole in through-hole drilling. The burr height in cavitation assisted drilling is smaller than that in conventional one and increases with the drilling number. The tool life in through-hole drilling is same as in blind hole one under various feed speeds and is the longest at a feed speed of 200mm/min. The effect of cavitation on the burr removal was investigated using B₄C powder and was observed at the early drilling holes.