OCTOBER 19-20, 2012 - YMCA University of Science & Technology

Proceedings of the National Conference on
Trends and Advances in Mechanical Engineering,
YMCA University of Science & Technology, Faridabad, Haryana, Oct 19-20, 2012
Fig. 8 Combined effect of EDG and grinding in EDAG process [37]
Koshy et al. [35] have suggested for effectively performance of EDAG process, the protrusion height of abrasive
particles is approximately 30% of the grain size is more suitable. It was found that the spark discharges thermally
soften the work material in grinding zone, hence soften material easily removed by grinding action and
consequently decrease the normal forces [35, 36]. Choudhury et al. [37] experimentally investigated that
tangential grinding force decreases with increase in voltage and duty factor for a particular value of current. Jain
and Mote [38] claimed that specific energy required in EDAG process is less than EDG. It has been investigated
by Yadav et al. [39] that the wheel speed and current are most significant factors that affecting performances of
EDAG. Yadav and Yadava [40-43] study the effects of parameters on self developed. Singh et al. [44-48]
developed EDAG process in face grinding mode for machining end surface of cylindrical workpiece and study
the effects of process parameters. Agrawal and Yadava [49, 50], Modi and Agrawal [51] developed EDAG
process in surface grinding mode for machining flat surface of workpiece and also study the effects of process
parameters on performance measures.
3. PROCESS PARAMETERS AND PERFORMANCE MEASURES
Similar to the EDM process, many parameters affected the performances of EDG. These are classified into two
categories: electrical parameters and non-electrical parameters. The electrical parameters are discharge voltage,
pulse current, pulse duration, pulse interval, pulse frequency, duty factor and polarity while non-electrical
parameters are types of dielectric and wheel rotational speed while the flushing method and flushing pressure of
dielectric are not significantly affects the performances of EDG. The performance measures are MRR, tool wear
rate (TWR), and average surface roughness (Ra). When the abrasive is added into metallic wheel then size of
abrasive, types of abrasive, bond materials and concentrations also affects the performance measured.
4. SUMMARY
In this paper authors are summarized to the published research papers on EDG process along with the process
parameters and their effects on performances measured. It cleared from the published papers that wheel speed
enhanced the flushing resulting performances of process is also enhanced. The ED milling is the unique
development in EDG process for machining insulating materials such as Al 2 O 3 . Adding the abrasive into
metallic wheel means unique changes in performances. This study helpful for researchers and developers, who
works in field of advanced manufacturing technology and making efforts for machining difficult to machine
materials at low cost.
REFERENCES
1. K.P. Rajurkar and S.M. Pandit, Formation and ejection of EDM debris, Transaction of ASME-Journal of
Engineering for Industry, 108:22-26, 1986.
2. K.M. Shu and G.C. Tu, Study of electrical discharge grinding using metal matrix composite electrodes,
International Journal of Machine Tools and Manufacture, 43:845-854, 2003.
3. V.K. Jain, Advanced Machining Processes, Allied Publisher, New Delhi, 2005.
4. H.E. Hofy, Advanced Machining Processes: Nontraditional and Hybrid Machining Processes, McGraw-Hill
Companies, New Delhi, 2005.
5. A. Ghosh and A.K. Malik, Manufacturing Science, East-West Press, New Delhi, 1999.
6. G. Boothroyd and A.K. Winston, Fundamentals of Metal Machining and Machine Tools, 2 nd edition, Marcel
Dekker, New York, 2005.
7. K.H. Ho, S.T. Newman, State of the art electrical discharge machining (EDM), International Journal of
Machine Tools and Manufactures, 43:1287-1300, 2003.
8. B.C. Abothula, V. Yadava and G.K. Singh, Development and experimental study of electrodischarge face
grinding, Materials and Manufacturing processes, 6:482-487, 2010.
9. H. Aoyama, I. Inasaki, T. Aoyama and S. Sekiya, Combined machining of hard and brittle materials, Nippon
Kikai Gakkai Ronbunshu, 51:1857-1863, 1985.
595