研究
炭素拡散反応を用いた形彫り放電加工による多結晶ダイヤモンドの3 次元形状創製
2019 年 53 巻 132 号 p. 5-11
詳細
2019 年 53 巻 132 号 p. 5-11
In our previous report, the electrical discharge machining (EDM) of polycrystalline diamond (PCD) using a carbon diffusion reaction with transition metal electrodes was proposed. The material removal rate and surface roughness were improved using a rotary cupronickel electrode for finish machining. In this work, we performed sinking EDM of PCD with a piezo-electrically vibrated cupronickel electrode for microstructure generation. Results showed that the material removal rate was improved by 2.3 times compared with a copper electrode even in rough machining. By observation of the machined surface and removed debris, it was found that molten cupronickel induced the carbon diffusion reaction and the promoted graphitization of diamond grains. Precise three-dimensional structures of PCD were successfully fabricated by vibration-assisted sinking EDM using the cupronickel electrode.
