鋼の超音波振動切削におけるダイヤモンド工具の摩耗抑制機構に関する研究

－ダイヤモンド工具の摩耗に及ぼす真空度の影響－

抄録

The authors propose a hypothesis that adsorption films generated on newly-formed ferrous surfaces protect diamond tools from diffusion wear in ultrasonic vibration cutting of ferrous materials. In order to verify this hypothesis, an experimental system which enables to carry out ultrasonic vibration cutting in a vacuum chamber was developed, then the machining experiments have been carried out in the chamber. The previous experimental results showed that the diamond tool edge is rapidly worn out in ultrasonic vibration cutting at high vacuum about 0.01Pa, which supports the proposed hypothesis. In this paper, the machining experiments were carried out by changing degree of vacuum, and effects of the degree of vacuum on the tool wear, chip formation and roughness of machined surfaces were investigated.