Optimisation of Dry Electrical Discharge Machining of High Speed Steel using Grey-Relational Analysis

Saman Fattahi, Islam Shyha, Hamid Baseri

Abstract


Dry electrical discharge machining (DEDM) is considered as a green format of the conventional oil dielectric EDM where a gas is used as the dielectric medium. This paper details experimental results when DEDM of high speed steel workpieces using multi-response optimisation. Experimental trials were performed to investigate the influence of current, pulse on-time, duty factor, gas pressure and spindle rotational speed on material removal rate (MRR), surface roughness (Ra) and radial over cut (ROC). Grey relational analysis (GRA) based on Taguchi approach was employed for multi-objective optimisation of DEDM responses. Confirmation trials were subsequently conducted and results showed that process responses can be successfully optimised using GRA. Results showed that current, duty factor and air pressure were found to be statistically significant factors at 90% confidence level, with percentage contribution ratios (PCRs) of 72.8%, 4.3% and 3.7% respectively. Micro pores and minor surface cracks were visible in the majority of specimens.


Keywords


Dry EDM; Grey Relational Analysis; Multi-objective Optimisation

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References


M. P. Jahan, M. Rahman, and Y. S. Wong, "A review on the conventional and micro-electrodischarge machining of tungsten carbide," International Journal of Machine Tools and Manufacture, vol. 51, pp. 837-858, 2011.

M. Kunieda, S. Furuoya, and N. Taniguchi, "Improvement of EDM Efficiency by Supplying Oxygen Gas into Gap," CIRP Annals - Manufacturing Technology, vol. 40, pp. 215-218, 1991.

M. Kunieda, M. Yoshida, and N. Taniguchi, "Electrical Discharge Machining in Gas," CIRP Annals - Manufacturing Technology, vol. 46, pp. 143-146, 1997.

M. W. Denny and A. S. o. Z. Meeting, Air and Water: The Biology and Physics of Life's Media: Princeton University Press, 1993.

M. Kunieda and C. Furudate, "High Precision Finish Cutting by Dry WEDM," CIRP Annals - Manufacturing Technology, vol. 50, pp. 121-124, 2001.

P. Govindan and S. S. Joshi, "Experimental characterization of material removal in dry electrical discharge drilling," International Journal of Machine Tools and Manufacture, vol. 50, pp. 431-443, 5, 2010.

R. Pawade and S. Joshi, "Multi-objective optimization of surface roughness and cutting forces in high-speed turning of Inconel 718 using Taguchi grey relational analysis (TGRA)," The International Journal of Advanced Manufacturing Technology, vol. 56, pp. 47-62, 2011.

J.-L. Deng, "Introducion to grey systems," The journal of grey sysems, vol. 1, pp. 1-24, 1989.

K.-T. Chiang and F.-P. Chang, "Optimization of the WEDM process of particle-reinforced material with multiple performance characteristics using grey relational analysis," Journal of Materials Processing Technology, vol. 180, pp. 96-101, 2006.

Y. Kuo, T. Yang, and G.-W. Huang, "The use of grey relational analysis in solving multiple attribute decision-making problems," Computers & Industrial Engineering, vol. 55, pp. 80-93, 8, 2008.

J. L. Lin and C. L. Lin, "The use of the orthogonal array with grey relational analysis to optimize the electrical discharge machining process with multiple performance characteristics," International Journal of Machine Tools and Manufacture, vol. 42, pp. 237-244, 1, 2002.

U. Çaydaş and A. Hasçalık, "Use of the grey relational analysis to determine optimum laser cutting parameters with multi-performance characteristics," Optics & Laser Technology, vol. 40, pp. 987-994, 10, 2008.

C.-H. Li and M.-J. Tsai, "Multi-objective optimization of laser cutting for flash memory modules with special shapes using grey relational analysis," Optics & Laser Technology, vol. 41, pp. 634-642, 7, 2009.




DOI: http://dx.doi.org/10.21535%2Fijrm.v2i4.886

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