Influence of Process Parameters in n-PMEDM of Inconel 800 with Electrode and Coated Electrodes

By considering the unique performances, the Powder Mixed Electrical Discharge Machining (PMEDM)
mostly encounter choice for machining the hard materials with job features like intricate shapes with grater accuracy
and those materials are difficult to cut in conventional machining processes. This Research aimed to prepare
parameter index chart for machining nickel based super alloy - Inconel 800 for various requirements. To achieve the
aim, In this experimental study on machining of Inconel 800 in PMEDM with electrolyte copper electrode as well as
silver coated electrolyte copper electrode is focused. Taguchi full factorial design derived from MINITAB release-16 software was used to design the experimentation. The factors like pulse off time, Current and Pulse on Time were
considered. The responses like amount of Tool Wear, Quantity of material removal, surface finishes were noted
against each case. In the same experimental conditions the coated electrode increased the MRR by 36.67% with
minor increment of maximum surface roughness to 16.11%.