• Vishal Kawthale
• Manish Deshmukh

This paper describes a study on the cooling effect on cupronickel electrode while electric discharge machining of nickel based super alloy Inconel 718 workpiece. To evaluate material removal rate (MRR), electrode wear rate (EWR) and average surface roughness values (SR) were the three responses observed. Peak current, pulse on time, voltage gap and duty cycle were the controllable process parameters. Taguchi experimental design of L9 orthogonal has been applied to investigate the optimal process parameters for maximum material removal rate (MRR), minimum electrode wear rate (EWR) and surface roughness (SR). The ANOVA analysis also been applied to investigate influencing parameters which effects response obtained from experimentation. The conclusions made from this study are optimum value combination of process parameters for optimum material removal rate (MRR) when using C.T cupronickel as electrode is Ip = 10 A, Ton = 300 µs, Vg = 50 V and Tau = 15.The optimum value combination of process parameters for optimum electrode removal rate (EWR) when using C.T cupronickel as electrode is Ip = 6 A, Ton = 100 µs, Vg = 70 V and Tau = 10.The optimum value combination of process parameters for optimum surface roughness (SR) when using C.T cupronickel as electrode is Ip = 6 A, Ton = 100 µs, Vg = 70 V and Tau = 15.This treatment majorly improves the tool wear rate and material removal rate as compared to surface roughness. From the experiments performed and the analysis carried out it can be concluded that cryogenically treated cupronickel is the best electrode as compared to non-treated electrode The C.T. cupronickel electrode produces improvement in electrode wear rate (6.611%), material removal rate (4.00%) and surface roughness (0.305%) as compare to Cupronickel electrode. Cryogenic treatment of tool electrodes result into reduction in electrode wear rate and material removal rate. Relatively lesser influence of the same has been observed on surface roughness.

Electrical discharge machining, Cryogenic treatment, Inconel 718 super alloy, Cupronickel (90/10), Regression analysis

"Influence of Cryogenically Treated Cupro-Nickel Electrode on Electric Discharge Machining of Inconel 718 Super Alloy", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.6, Issue 6, page no.500-505, June-2019, Available :http://www.jetir.org/papers/JETIR1906F78.pdf

"Influence of Cryogenically Treated Cupro-Nickel Electrode on Electric Discharge Machining of Inconel 718 Super Alloy", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.6, Issue 6, page no. pp500-505, June-2019, Available at : http://www.jetir.org/papers/JETIR1906F78.pdf