American Journal of Mechanical Engineering
ISSN (Print): 2328-4102 ISSN (Online): 2328-4110 Website: http://www.sciepub.com/journal/ajme Editor-in-chief: Kambiz Ebrahimi, Dr. SRINIVASA VENKATESHAPPA CHIKKOL
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American Journal of Mechanical Engineering. 2016, 4(6), 226-235
DOI: 10.12691/ajme-4-6-4
Open AccessArticle

Experimental Investigation of Different Additives used for Surface Modification of EN31 Steel by EDM Process

Rajeev Kumar1, and S. S. Banwait1,

1Mechanical Engineering, National Institute of Technical Teachers Training and Research, Chandigarh, India

Pub. Date: December 06, 2016

Cite this paper:
Rajeev Kumar and S. S. Banwait. Experimental Investigation of Different Additives used for Surface Modification of EN31 Steel by EDM Process. American Journal of Mechanical Engineering. 2016; 4(6):226-235. doi: 10.12691/ajme-4-6-4

Abstract

The present work describes an advance method of surface modification by electric discharge machining. In this work, additive mixed powder metallurgy copper tungsten electrode has been used for the surface modification of En-31 die steel. Three additives zinc stearate, calcium stearate and nickel were used in P/M composite electrode and their effect was analysed. The effect of compaction pressure, peak current, pulse on time and pulse off time on surface deposition rate, surface roughness and micro hardness of the deposited layer has been investigated. During pilot experimentation surface modification process was carried out with three different additives viz. zinc stearate, calcium stearate and nickel. The performance parameters predicted that calcium stearate is the best additive. Therefore further experimentation were carried out by using calcium stearate as additive in the manufacturing P/M electrode and its effect on surface modification of En-31 steel has been investigated. Central composite rotatable design (CCRD) technique was used for design of experiments and subsequent results have been analysed. Analysis of variance had been performed to check the adequacy of the developed mathematical models as well as significance of each term comprising the models. The maximum surface deposition rate achieved was 1.4mg/min at 7.5 Amps peak current, 20 µsec pulse on-time, 100 µsec pulse off-time and 700 MPa compaction pressure. The best value of surface finish obtained was 5.24 µm at 4.5 Amp peak current, 10 µsec pulse on-time, 200 µsec pulse off-time and 1100 MPa powder compaction pressure. The maximum value of micro hardness observed was 78.3 HRC at 7.5 Amps peak current, 10 µsec pulse on-time, 100 µsec pulse off-time and 700 MPa compaction pressure.

Keywords:
electric discharge machining additive response surface methodology central composite rotatable design analysis of variance

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References:

[1]  Dewes R, Aspinwall D, Simao J and Lee H. G., “Electrical Discharge Machining and Surface Alloying – The Process, Parameters and State of Play”, Materials World, Vol. 11, No. 5, pp 16-18, 2003.
 
[2]  Sidhu, H.S. and Banwait, S.S., “Analysis and multi-objective optimisation of surface modification phenomenon by EDM process with copper-tungsten semi-sintered P/M composite electrodes”, American Journal of Mechanical Engineering, 2(5), pp. 130-142, 2014.
 
[3]  Bhattacharya, A., Batish, A., and Kumar, N., “Surface characterisation and material migration during surface modification of die steels with silicon, graphite and tungsten powder in EDM process”, Journal of mechanical science and technology, 27, (1), pp. 133-140, 2003.
 
[4]  Furutani, K. and Shimizu, Y., “Experimental analysis of deposition process of lubricant surface by EDM with molybdenum disulphide powder suspended in working oil”, Proceedings of American Society for Precision Engineering, Vol. 30, pp. 547-550, 2003.
 
[5]  Lin, Y.C., Yan, B.H. and Huang, F.Y., “Surface modification of Al–Zn–Mg aluminium alloy using the combined process of EDM with USM”, Journal of Materials Processing Technology, 115, pp. 359-366, 2001.
 
[6]  Gill A. S., and Kumar S., “Surface alloying of H11 die steel by tungsten using EDM process” International Journal of Advance Manufacturing Technology, Vol.78, pp. 1585-1593, 2015.
 
[7]  Samuel M.P. and Philip P.K., “Power metallurgy tool electrodes for electrical discharge machining” International Journal of Mechanical Tools manufacturing, Vol.37, No.11, pp 1625-1633, 1997.
 
[8]  Murugan M., “Surface modification using sintered electrode on electric discharge machining” Proceedings of the ‘National conference on emerging trends in Mechanical Engineering 2013.
 
[9]  Wong Li. Li., Fuh, J.Y.H., and Lu Li, “Effect of TiC in copper-tungsten electrodes on EDM performance”, Journal of Material Processing Technology, Vol.113, pp. 563-567, 2001.
 
[10]  Aspinwall D. K., Dewes R. C., Lee H. G. and Simao J., “Electrical discharge surface alloying of Ti and Fe work piece materials using refractory powder compact electrodes and Cu wire”, Annals of the CIRP, Vol. 52, No. 1, pp. 151-160, 2003.
 
[11]  Simao J., Lee H. G., D. Aspinwall K., Dewes R. C. and Aspinwall E. M., “Work piece surface modification using electrical Discharge machining”, International Journal of Machine Tool and Manufacturing, Vol. 43, pp. 121-128, 2003.
 
[12]  Patowari, K. P., and Mishra, P. K., “Artificial neural network model in surface modification using tungsten-copper powder metallurgy sintered electrode” International Journal of Advance Manufacturing Technology, Vol.51, pp. 627-338, 2010.
 
[13]  Gill A. S., Kumar S., “Surface alloying of H11 die steel by tungsten using EDM process” International Journal of Advance Manufacturing Technology, Vol.78, pp. 1585-1593, 2015.
 
[14]  Cogun, C., Kocabas, B., and Zgedik, A.O., “Experimental and theoretical investigation of work piece surface profiles in electrical discharge machining (EDM)”, Journal of the Faculty of Engineering and Architecture of Gazi University, 19, pp. 97-106, 2004.
 
[15]  Patowari, P.K., Saha, P., and Mishra, P.K., “Artificial neural network model in surface modification by EDM using tungsten-copper powder metallurgy sintered electrodes”, International Journal of Advanced Manufacturing Technology, pp. 551-627, 2010.
 
[16]  Sharif, S. and Noordin, R.M., “Machinability modeling in powder mixed dielectric EDM of titanium alloy Ti6246”, Proceeding of the first international conference and seventh AUN/SEED-net Field wise Seminar on Manufacturing and Material Processing, Kuala Lumpur, pp. 133-138, 2006.
 
[17]  Sidhu, H.S. and Banwait, S.S., “Development of RSM Model in Surface Modification of EN-31 Die Steel Material Using Copper-Tungsten Powder Metallurgy Semi-Sintered Electrodes by EDM Process”, 1(6), pp. 155-160, 2013.
 
[18]  Beri, N., Maheshwari S., Sharma S. and Kumar A., “Surface Quality Modification using Powder Metallurgy Processed CuW Electrode during Electric Discharge Machining of Inconel 718”, Procedia Materials Science, Vol.5, pp, 2629-2634, 2014.