Effect Of Process Parameters On The Machining Characteristics Of Stir Casted Work Piece Aluminum 6061 With Sic Using Sinker Edm


Kaveti Santhoshi


Lecture in Mechanical Engineering, Jawaharlal Nehru Govt. Polytechnic, Hyderabad, Telangana, India.

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The electrical discharge machining (EDM) is a one of an electrical energy based unconventional machining technique. The EDM is used in mould and die making industries, automobile industries and also making of Aerospace components. The present work is to investigate surface modification and the effects of the various EDM process parameters on the machining quality and obtain the optimal process parameters. The optimization is done by using Taguchi technique considering L9 orthogonal array and experiments are conducted on the pieces varying input parameters like pulse on time pulse off time peak current with constant time. The work piece and electrode materials used for machining are Stir casted aluminum 6061 with SiC (6.5%) and copper (12 mm diameter rod). The process parameters are pulse on time 75 μ sec, 150 μ sec, 225 μ sec, Pulse off time 40 μ sec, 80 μ sec, 120 μ sec and peak current 5 amps, 10 amps, 15 amps with constant time 5 minutes, flushing pressure and spark gap (0.2 mm). Find out the MRR, TWR, surface roughness, hardness of work piece before and after stir casting process and scanning electron microscopy (SEM) analysis was performed to investigate the surface topography of the EDM job.