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Electrical Discharge Machining Processes

  • Masanori KuniedaEmail author
Reference work entry

Abstract

Electrical discharge machining (EDM) is a removal process which exploits melting and evaporating of workpiece materials caused by pulse discharges which are ignited several thousands to tens of thousands times per second in the small gap between the tool electrode and workpiece. The advantage is that electrically conductive materials can be machined very precisely into complicated shapes independent of their hardness. Hence, EDM is preferably used in die and mold making, aeroengine manufacturing, and micro-hole drilling for ink jet and fuel nozzles, where complicated shapes in hard materials and with high precision have to be machined. This chapter first describes the principle of EDM. Then, the removal mechanism due to single pulse discharge is explained in details from the thermophysical aspects, followed by the clarification of the gap phenomena in consecutive pulse discharges. Thus, the machining characteristics of EDM are understood theoretically based on the fundamental insight into the phenomena.

Keywords

Material Removal Rate Electrical Discharge Machine Wire Electrical Discharge Machine Tool Electrode Electrical Discharge Machine Process 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

References

  1. Altpeter F, Perez R (2004) Relevant topics in wire electrical discharge machining control. J Mater Process Technol 149(1–3):147–151CrossRefGoogle Scholar
  2. Araie I, Sano S, Kunieda M (2008) Influence of electrode surface profile on discharge delay time in electrical discharge machining. Int J Electr Mach 13:21–28Google Scholar
  3. Bommeli B, Frei C, Ratajski A (1979) On the influence of mechanical perturbation on the breakdown of a liquid dielectric. J Electrost 7:123–144CrossRefGoogle Scholar
  4. Eckman PK, Williams EM (1960) Plasma dynamics in arc formed by low-voltage sparkover of a liquid dielectric. Appl Sci Res Sect B 8:299–320CrossRefGoogle Scholar
  5. Hayakawa S, Xia H, Kunieda M, Nishiwaki N (1996) Analysis of time required to deionize an EDM gap during pulse interval. In: Proceedings of symposium on molecular and microscale heat transfer in materials processing and other applications, Yokohama, pp 368–377Google Scholar
  6. Hayakawa S, Yuzawa M, Kunieda M, Nishiwaki N (2001) Time variation and mechanism of determining power distribution in electrodes during EDM process. Int J Electr Mach 6:19–26Google Scholar
  7. Ikai T, Fujita I, Hashiguchi K (1992) Heat input radius for crater formation in the electric discharge machining. Trans IEE Jpn 112-D(10):943–949 (in Japanese)Google Scholar
  8. Institute of Electrical Engineers of Japan (1998) Electrical discharge handbook, Vol. 2: 63-64 (in Japanese) The Institute of Electrical Engineers of Japan, TokyoGoogle Scholar
  9. Kitamura T, Kunieda M, Abe K (2013) High-speed imaging of EDM gap phenomena using transparent electrodes. In: Proceedings of the 17th CIRP conference on electro physical and chemical machining (ISEM), Leuven, pp 315–320Google Scholar
  10. Koenig W, Weill R, Wertheim R, Jutzler WI (1977) The flow fields in the working gap with electro-discharge-machining. Ann CIRP 25(1):71–76Google Scholar
  11. Kojima A, Natsu W, Kunieda M (2008) Spectroscopic measurement of arc plasma diameter in EDM. Ann CIRP 57(1):203–207CrossRefGoogle Scholar
  12. Kunieda M, Kobayashi T (2004) Clarifying mechanism of determining tool electrode wear ratio in EDM sing spectroscopic measurement of vapor density. J Mater Process Technol 149:284–288CrossRefGoogle Scholar
  13. Kunieda M, Kojima H (1990) On-line detection of EDM spark locations by multiple connection of branched electric wires. Ann CIRP 39(1):171–174CrossRefGoogle Scholar
  14. Kunieda M, Nakashima T (1998) Factors determining discharge location in EDM. Int J Electr Mach 3:53–58Google Scholar
  15. Kunieda M, Yoshida M (1997) Electrical discharge machining in gas. Ann CIRP 46(1):143–146CrossRefGoogle Scholar
  16. Lazarenko BR (1943a) To invert the effect of wear on electric power contacts. Dissertation of the All-Union Institute for Electro Technique in Moscow/CCCP (in Russian)Google Scholar
  17. Lazarenko BR (1943b) SU-Pat 70010/IPC B23p/Priority, 4 March 1943Google Scholar
  18. Lee TH (1959) T-F theory of electron emission in high-current arcs. J Appl Phys 30(2):166–171CrossRefGoogle Scholar
  19. Masaki T (1993) Micro electro discharge machining technologies. Natl Tech Rep 39(5):515–521Google Scholar
  20. Meek JM, Craggs JD (1978) Electrical breakdown of gases. Wiley, New YorkGoogle Scholar
  21. Mohri N, Fukuzawa Y, Tani T, Sata T (2002) Some considerations to machining characteristics of insulating ceramics. Ann CIRP 51(1):161–164CrossRefGoogle Scholar
  22. Mood AM, Graybill FA, Boes DC (1974) Introduction to the theory of statistics, 3rd edn. McGraw-Hill, New YorkzbMATHGoogle Scholar
  23. Morimoto K, Kunieda M (2009) Sinking EDM simulation by determining discharge locations based on discharge delay time. Ann CIRP 58(1):221–224CrossRefGoogle Scholar
  24. Natsu W, Ojima S, Kobayashi T, Kunieda M (2004a) Temperature distribution measurement in EDM arc plasma using spectroscopy. JSME Int J C 47(1):384–390CrossRefGoogle Scholar
  25. Natsu W, Kunieda M, Nishiwaki N (2004b) Study on influence of inter-electrode atmosphere on carbon adhesion and removal amount. Int J Electr Mach 9:43–50Google Scholar
  26. Rich JA (1961) Resistance heating in the arc cathode spot zone. J Appl Phys 32(6):1023CrossRefGoogle Scholar
  27. Saeki T, Kunieda M, Ueki M, Satoh Y (1996) Influence of Joule heating on EDM processes of high-electric-resistivity materials. ASME HTD 336:95–103Google Scholar
  28. Saito N, Kobayashi K (1967) Machining principle and characteristics of electric discharge machining. Mitsubishi Denki Giho 41(10):1222–1230 (in Japanese)Google Scholar
  29. Schumacher BM (1990) About the role of debris in the gap during electrical discharge machining. Ann CIRP 39(1):197–199CrossRefGoogle Scholar
  30. Schumacher BM, Krampitz R, Kruth J-P (2013) Historical phases of EDM development driven by the dual influence of “Market Pull” and “Science Push”. Procedia CIRP 6:5–12CrossRefGoogle Scholar
  31. Takeuchi H, Kunieda M (2007) Effects of volume fraction of bubbles in discharge gap. In: Proceedings of ISEM XV, Pittsburgh, pp 63–68Google Scholar
  32. Van Dijck F (1973) Physico-mathematical analysis of the electro discharge machining process. Dissertation of Katholieke Universiteit LeuvenGoogle Scholar
  33. Xia H, Kunieda M, Nishiwaki N (1996) Removal amount difference between anode and cathode in EDM process. Int J Electr Mach 1:45–52Google Scholar
  34. Yang Y, Mukoyama Y (1996) Three-dimensional analysis of residual stress in EDM process. Int J Electr Mach 1:27–33Google Scholar
  35. Yang XD, Guo JW, Chen XF, Kunieda M (2010) Molecular dynamics simulation of the material removal mechanism in Micro-EDM. Precis Eng 35:51–57CrossRefGoogle Scholar
  36. Yang XD, Han X, Zhou F, Kunieda M (2013) Molecular dynamics simulation of residual stress generated in EDM. In: Proceedings of the 17th CIRP conference on electro physical and chemical machining (ISEM), Leuven, pp 433–438Google Scholar
  37. Yoshida M, Kunieda M (1998) Study on the distribution of scattered debris generated by a single pulse discharge in EDM process. Int J Electr Mach 3:39–47Google Scholar
  38. Zahiruddin M, Kunieda M (2010) Energy distribution ratio into micro EDM electrodes. J Adv Des Syst Manuf 4(6):1095–1106Google Scholar
  39. Zingerman AS (1956) The effect of thermal conductivity upon the electrical erosion of metals. Sov Phys Tech Phys 1(2, 9):1945–1958Google Scholar
  40. Zolotykh BN (1959) The mechanism of electrical erosion of metals in liquid dielectric media. Sov Phys Tech Phys 4(12):1370–1373Google Scholar

Copyright information

© Springer-Verlag London 2015

Authors and Affiliations

  1. 1.Department of Precision Engineering, School of EngineeringThe University of TokyoTokyoJapan

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