OPTIMIZATION OF PROCESS PARAMETERS FOR CNC EDM ON OHNS TOOL STEEL USING DESIRABILITY FUNCTION

摘要

Electrical Discharge Machining (EDM) is well-established unconventional machining and able to machine complex geometries as well as difficult-to-machine materials such as super alloys, carbides, heat treated tool steels, composites, heat resistant steels etc. Present paper is focused on the detailed study and optimization of machining parameters of EDM on response variables using reverse polarity. Experiments were designed and conducted using Central Composite Rotatable Design (CCRD) involving three input factors with five levels. Separate Analysis of Variance (ANOVA) for MRR and TWR were conducted and contribution of each parameter affecting the improvement in MRR and TWR was done through regression equation. Investigation results indicates that MRR and TWR increases with an increase in the current and Ton. Multi response optimization was conducted for maximum MRR and minimum TWR and optimization values are 8.28A (current), 60 ?s (Ton) and 10?s (Toff).