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OPTIMIZATION AND INFLUENCE OF PROCESS PARAMETERS FOR MACHINING WITH WEDM

S.Sivanaga MalleswaraRaouthor, Ch.V.S.ParameswaraRao

The main objective of this work is to evaluate the best WEDM process parameters for machining 18-4-1 grade High Speed Steel (HSS) of different thickness ranging from 5mm to 80mm. The experiments are carried out on work pieces by varying the power input. The best power value at which the machining is stable with high cutting speed is identified. Width of the machined slot is measured and Spark gap is calculated for the machining at the corresponding power. The material removal rate (MRR) is computed. Surface roughness value is measured on the machined surface. The machining parameters at different power inputs are recorded. The experiments are repeated for all the job thicknesses under study. Mathematical correlations were developed using software for computing MRR and power input with respect to thickness of the job to be machined. The parameters evaluated and mathematical correlations are useful in setting the machine for the required machining criteria.