This study investigates the dry and near-dry electrical discharge machining (EDM) milling to achieve a high material removal rate (MRR) and fine surface finish for roughing and finishing operations, respectively. Dry EDM uses gas and near-dry EDM applies a liquid-gas mixture as the dielectric medium. Experimental studies leading to the selection of oxygen gas and copper electrode for high MRR dry EDM and the nitrogen-water mixture and graphite electrode for fine surface finish near-dry EDM are presented. Near-dry EDM exhibits the advantage of good machining stability and surface finish under low discharge energy input. A fractional factorial design is applied to investigate the effect of discharge current, pulse duration, and pulse interval on the MRR and surface finish in dry and near-dry EDMs. Lower pulse duration and lower discharge current are identified as key factors for improving the surface finish in near-dry EDM.
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February 2008
Research Papers
Experimental Study of the Dry and Near-Dry Electrical Discharge Milling Processes
Jia Tao,
Jia Tao
Mechanical Engineering,
University of Michigan
, Ann Arbor, MI 48109-2125
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Jun Ni
Jun Ni
Mechanical Engineering,
University of Michigan
, Ann Arbor, MI 48109-2125
Search for other works by this author on:
Jia Tao
Mechanical Engineering,
University of Michigan
, Ann Arbor, MI 48109-2125
Albert J. Shih
Jun Ni
Mechanical Engineering,
University of Michigan
, Ann Arbor, MI 48109-2125J. Manuf. Sci. Eng. Feb 2008, 130(1): 011002 (9 pages)
Published Online: January 16, 2008
Article history
Received:
June 7, 2007
Revised:
August 10, 2007
Published:
January 16, 2008
Citation
Tao, J., Shih, A. J., and Ni, J. (January 16, 2008). "Experimental Study of the Dry and Near-Dry Electrical Discharge Milling Processes." ASME. J. Manuf. Sci. Eng. February 2008; 130(1): 011002. https://doi.org/10.1115/1.2784276
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