Multiple Discharges Phenomena in EDM Using Electrostatic Induction Feeding Method

Abstract:

In the micro EDM method by electrostatic induction feeding, a pulse voltage source is coupled to the tool electrode by a capacitor in order to reduce the minimum discharge energy per pulse. Positive pulse voltage and negative pulse voltage are applied to the tool electrode alternately, relative to the workpiece. In this study, it was found that when the feeding capacitance was large, multiple discharges occurred frequently during a single pulse duration of the pulse voltage source. Since the impedance of the pulse voltage source which was produced by the authors varied depending on the polarity, the multiple discharges occurred in the polarity with the higher impedance, while they did not occur in the opposite polarity. It was also found that when multiple discharges occurred, the discharge energy was released intermittently in the multiple discharges. In this study, using multiple discharges phenomena, better surface was obtained with higher removal speed.

• Periodical: Key Engineering Materials (Volumes 523-524)
• Pages: 316-321
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.523-524.316
• Online since: November 2012
• Authors: Guang Lei Feng, Xiao Dong Yang, Kun Tian, Xue Zhi Wang
• Keywords: Electrical Discharge Machining (EDM), Electrostatic Induction Feeding, Impedance, Multiple Discharges, Stray Capacitance

References

[1] T. Masuzawa, State of the Art of Micromachining, Annals of the CIRP. 49(2) (2000) 473 -488.

DOI: 10.1016/s0007-8506(07)63451-9

[2] T. Kawakami, M. Kunieda, Study on Factors Determining Limits of Minimum Machinable Size in Micro EDM, Annals of the CIRP. 54(1) (2005) 167-170.

DOI: 10.1016/s0007-8506(07)60075-4

[3] M. Hanada, M. Kunieda and I. Araie, Development of micro EDM using electrostatic induction feeding, J. Journal of the Japan Society for Precision Engineering, 72(5) (2006)636–640.

DOI: 10.2493/jspe.72.636

[4] M. Kunieda, A. Hayasaka, X.D. Yang, S. Sano and I. Araie, Study on nano EDM using capacity coupled pulse generator, Annals of the CIRP. 56 (1) (2007)213–216.

DOI: 10.1016/j.cirp.2007.05.051

[5] Xiaodong Yang, Chunwei Xu and Masanori Kunieda, Miniaturization of WEDM Using Electrostatic Induction Feeding Method, J. Precision Engineering. 34 (2010)279–285.

DOI: 10.1016/j.precisioneng.2009.07.002

[6] H Xia, M. Kunieda, N. Nishiwaki, Removal Amount Difference between Anode and Cathode in EDM process, IJEM. 1(1996)45-52

DOI: 10.2526/ijem.1.45