• SHEETAL KUMAR
• vipin yadav
• nitin shukla

Inconel-718 is a high performance super-alloys has excellent mechanical strength at elevated temperature, as cryogenic temperature. While these materials are harder, tougher, less heat sensitive and more resistant to corrosion and fatigue, they are more difficult to machine. Because of work hardening property, Inconel-718 is difficult to machine by using conventional machining techniques Electric discharge machining is a non-conventional machining process used to machine very hard materials such as Inconel alloy which is most widely used in aerospace industry, Die and Mould making industries to produce complex cavity and intricate shapes. In the present work, studies have been conducted to investigate the effect of process discharge current, pulse on time, pulse off time and concentration of powder on material removal rate, tool wear and surface roughness in Graphite powder mixed electrical discharge machining (PMEDM). The investigations have been conducted on Inconel 718 alloy, which is having wide industrial applications. Inconel 718 has high strength at elevated temperature, good corrosive and wear resistance at different environmental conditions. In the present work, experiments have been conducted using Design of Experiments and single parameter optimization has been carried out using Taguchi technique to establishing the graphite powder range. Response surface methodology is used to developed mathematical models and Single Objective optimization of process parameters for maximum MRR and minimum tool wear and surface roughness with graphite powder mixed EDM of Inconel 718 alloy. The ANOVA analysis revealed that the discharge current, pulse on time and graphite powder concentration are most significant parameters which affecting the performance characteristics. This paper summarizes some of the major aspects of machining parameter of Inconel 718 alloy machining operation through PMEDM and an attempt has also been made to optimize the process parameters of PMEDM in order to maximize the material removal rate, minimize the tool wear rate and surface roughness.

Keywords : PMEDM, EDM, Inconel 718 alloy, unconventional machining

"Study And Optimization Of Graphite Powder Mixed Electric Discharge Machining Of Inconel 718 Alloy ", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.3, Issue 6, page no.135-154, June-2016, Available :http://www.jetir.org/papers/JETIR1606023.pdf

"Study And Optimization Of Graphite Powder Mixed Electric Discharge Machining Of Inconel 718 Alloy ", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.3, Issue 6, page no. pp135-154, June-2016, Available at : http://www.jetir.org/papers/JETIR1606023.pdf