Effect of Electrode Materials on Electric Discharge Machining of 316 L and 17 - 4 PH Stainless Steels

Subramanian Gopalakannan, Thiagarajan Senthilvelan

Department of Mechanical Engineering, Pondicherry Engineering College, Puducherry, India.

DOI: 10.4236/jmmce.2012.117053                

Abstract

Electric Discharge Machining (EDM) is one of the most efficiently employed non-traditional machining processes for cutting hard-to-cut materials, to geometrically complex shapes that are difficult to machine by conventional machines. In the present work, an experimental investigation has been carried out to study the effect of pulsed current on material removal rate, electrode wear, surface roughness and diameteral overcut in corrosion resistant stainless steels viz., 316 L and 17-4 PH. The materials used for the work were machined with different electrode materials such as copper, copper-tungsten and graphite. It is observed that the output parameters such as material removal rate, electrode wear and surface roughness of EDM increase with increase in pulsed current. The results reveal that high material removal rate have been achieved with copper electrode whereas copper-tungsten yielded lower electrode wear, smooth surface finish and good dimensional accuracy.

Keywords

Electric Discharge Machining; Material Removal Rate; Electrode Wear; Surface Roughness; Stainless Steel

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1]	J.S. Soni and G. Chakraverti, Effect of electrode material properties on surface roughness and dimensional accuracy in electric-discharge machining of high carbon high chromium die steel. J. Ind. Eng. 76 (1995) 46-51.
[2]	S.H. Lee and X.P. Li, Study of the effect of machining parameters on machining characteristics in electric discharge machining of tungsten carbide. J. Mater. Process. Technol. 115 (2001) 344-358.
[3]	K.H. Ho and S.T. Newman, State of the art electrical discharge machining (EDM). Int. J. Mach. Tools Manuf. 43 (2003) 1287-1300.
[4]	S. Singh, S. Maheshwari and P.C. Pandey, Some investigations into the electric discharge machining of hardened tool steel using different electrode materials. J. Mater. Process. Technol. 149 (2004) 272-277.
[5]	N. Mohd Abbas, D.G. Solomon and Md. Faud Bahari, A review on current research trends in electric discharge machining. Int. J. Mach. Tools Manuf. 47 (2006) 1214-1228.
[6]	C.J. Luis, I. Puertas and G. Villa, Material removal rate and electrode wear study on the EDM of silicon carbide. J. Mater. Process. Technol. 164-165 (2005) 889-896.
[7]	B.V. Manoj Kumar, J. Ramkumar, Bikramjit Basu and S. Kang, Electro discharge machining performance of TiCN-based cerments. Int. J. Ref. Met. Hard Mater. 25 (2007) 293-299.
[8]	B. Bhattacharya, S. Gangopadhyay and B.R. Sarkar, Modeling and analysis of EDMED job surface integrity. J. Mater. Process. Technol. 189 (2007) 169-177.
[9]	K.D. Chattopadhyay, S. Verma, P.S. Satsangi and P.C. Sharma, Development of empirical model for different process parameters during rotary electrical discharge machining of copper-steel (EN-8) system. J. Mater. Process. Technol. 209 (2009) 1454-1465.
[10]	A. Muttamara, Y. Fukuzawa, N. Mohri and T. Tani, Effect of electrode material on electric discharge machining of alumina. J. Mater. Process. Technol. 115 (2009) 344-358.
[11]	M.P. Jahan, Y.S. Wong and M. Rahman, A study on the fine-finish die-sinking micro-EDM of tungsten carbide using different electrode materials. J. Mater. Process. Technol. 209 (2009) 3956-3967.
[12]	Marafona Jose Duarte and Araujo Arlindo, Influence of workpiece hardness on EDM performance. Int. J. Mach. Tools Manuf. 49 (2009) 744-748.
[13]	Sushant Dhar, Rajesh Purohit, Nishant Saini and G. Hemath Kumar, Mathematical modeling of electric discharge machining of cast Al-4Cu-6Si alloy – 10 wt% SiCp composites. J. Mater. Process. Technol. 194 (2007) 24-29.
[14]	M. Kiyak and O. Cakir, Examination of machining parameters on surface roughness in EDM of tool steel. J. Mater. Process. Technol. 191 (2007) 141-144.