Experimental investigation on dry electrical discharge machining using helium gas

Govindan Puthumana, Rahul Agarwal, Suhas S. Joshi

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Abstract

In a dry EDM process, a gaseous dielectric replaces the liquid dielectric. Low MRR, arcing and damage on machined surfaces are the critical issues of this process. This work aims to examine the viability of dry EDM using helium gas dielectric. Experiments were performed to explore the effects of parameters such as voltage (V), current (I), pulse ‘off-time’ (Toff), gas pressure (P) and spindle speed (N) on MRR, TWR, oversize and depth achieved. Statistical analysis using ANOVA showed that spindle speed (N) and discharge current (I) were the most significant in influencing the MRR and the oversize respectively. Analysis of dry EDMed surface morphology indicated that surface damages were lesser by using helium than using oxygen gas dielectric.
Original languageEnglish
Title of host publicationProceedings of the 3rd International & 24th AIMTDR
Number of pages6
Publication date2010
Publication statusPublished - 2010
Externally publishedYes
Event3rd International and 24th All India Manufacturing Technology Design and Research Conference - Andhra University, Visakhapatnam, India
Duration: 13 Dec 201015 Dec 2010

Conference

Conference3rd International and 24th All India Manufacturing Technology Design and Research Conference
LocationAndhra University
CountryIndia
CityVisakhapatnam
Period13/12/201015/12/2010

Keywords

  • Dry EDM
  • Helium
  • MRR
  • TWR
  • Oversize
  • Depth

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