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Experimental investigation on effects of dielectric mediums in near-dry electric discharge machining

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Abstract

A dielectric fluid plays a significant role on the machining efficiency of Electric discharge machining (EDM). Two phase (liquid-air) dielectric medium was utilized in near-dry (EDM). It is an environmentally friendly process. The present article reports the effect of different dielectric mediums on responses of near-dry EDM. Dielectric mediums used for experimentation were water-air, EDM oil-air and glycerin-air mixtures. The process parameters selected for experimentation were current, duty factor, flushing pressure and lift. Material removal mechanism of near-dry EDM is investigated using imaging techniques. Dielectric fluid with higher viscosity and higher Prandtl number provided better results than fluids with lower viscosity. The results reveal that the Material removal rate (MRR) with glycerin-air dielectric medium is about three-times higher than other dielectric medium used with negligible recast layer. The tool wear rate is negligible in near-dry EDM in relation to all the dielectric mediums.

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Authors and Affiliations

  1. Mechanical & Industrial Engineering Department, Indian Institute of Technology (IIT) Roorkee, Uttarakhand, 247667, India

    Krishnakant Dhakar & Akshay Dvivedi

  2. Chemical Engineering Department, Indian Institute of Technology (IIT) Roorkee, Uttarakhand, 247667, India

    Amit Dhiman

Authors
  1. Krishnakant Dhakar
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  2. Akshay Dvivedi
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  3. Amit Dhiman
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Correspondence to Krishnakant Dhakar.

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Recommended by Associate Editor Hyung Wook Park

Krishnakant Dhakar is a Research Scholar in Mechanical and Industrial Engineering Department, IIT Roorkee, India. He obtained his M.E. in Production Engineering from PEC University of Technology, Chandigarh, India in 2009. In 2007, he completed his B.E. in Industrial and Production Engineering from Jabalpur Engineering College, Jabalpur Madhya Pradesh, India. His area of research is advanced manufacturing processes.

Akshay Dvivedi is an Associate Professor in Mechanical and Industrial Engineering, IIT Roorkee, India. He received his Ph.D. and M.Tech. in Mechanical Engineering from IIT Roorkee, India. His interests include quality engineering, advanced manufacturing processes, automobile engineering, robotics, advanced manufacturing processes and CAD/CAM/CAE.

Amit Kumar Dhiman is an Associate Professor of Chemical Engineering, Indian Institute of Technology Roorkee, India. He received his Ph.D. in Chemical Engineering from IIT Kanpur, India. His areas of interest are fluid mechanics, CFD, non-Newtonian fluids, bluff body flow and heat transfer, FVM and FDM Solvers.

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Dhakar, K., Dvivedi, A. & Dhiman, A. Experimental investigation on effects of dielectric mediums in near-dry electric discharge machining. J Mech Sci Technol 30, 2179–2185 (2016). https://doi.org/10.1007/s12206-016-0425-x

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  • DOI: https://doi.org/10.1007/s12206-016-0425-x

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