Advancements in Fundamental Studies on EDM Gap Phenomena
This paper summarizes the results of recent fundamental studies on the phenomena occurring in the electrical discharge machining (EDM) gap between parallel plane electrodes. Use of a dielectric liquid is effective mainly in cooling the gap and preventing debris particles from reattaching on the electrode surfaces. In continuous pulse discharges, the working gap is mostly occupied by bubbles generated by discharge. Therefore, debris particles and removal volume per single pulse discharge show intermediate values between those separately obtained by single pulse discharges in single phase gas and liquid. The plasma diameter grows to several times larger than the gap width within a few microseconds after dielectric breakdown, followed by gradual increase in the crater diameter which is still much smaller than the diameter of the plasma. Energy distribution into the anode is consistently greater than that into the cathode, and rarely affected by the discharge duration. The energy loss into the gap in the case of micro EDM is 85% which is much higher than macro EDM, because more energy is used for the generation and enthalpy increase of the plasma.
Electrical discharge machining (EDM) Discharge gap Arc column Bubble Dielectric liquid Material removal
Masanori Kunieda
The University of Tokyo, Tokyo 113-8656, Japan
国际会议
The 16th International Symposium on Electromachining(第16届国际电加工会议)
上海
英文
15-23
2010-04-19（万方平台首次上网日期，不代表论文的发表时间）