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Title: Influence of dominant variables and their optimization for nano powder blended EDM process
Authors: Santarao, Korada
Prasad, C L V R S V
Swaminaidu, Gurugubelli
Keywords: SiC nanopowder;Surface roughness;Taguchi technique;Micro-cracks
Issue Date: Oct-2019
Publisher: NISCAIR-CSIR, India
Abstract: Electric discharge machining (EDM) is a non-contact type manufacturing process used to machine hard materials. Obtaining surfaces with the desired surface finish is the primary challenge when employing this process in any industry. Powder blended EDM, a process in which properties of dielectric are varied by blending it with an appropriate weight of powder, is one among many methods coined to overcome this challenge. Also, previous researchers concentrated on blending dielectrics with semi-metal, metal and non-metallic powders to understand the variations in material removal rate and surface finish. Results inferred employing ceramic powders as a blend in EDM dielectric medium have been still limited. Hence, to bridge this gap, the current work attempts to investigate the influence of ceramic powder concentration, pulse-on time, peak current, gap voltage on the surface roughness of AISI D3 Die steel. Several experiments have been conducted with different combinations of process parameters using Taguchi method. Results indicated that powder concentration plays a significant role in enhancing surface finish, i.e., the quality of the machined surface. Further, among the other parameters considered peak current has the highest impact followed by pulse-on time and voltage on the performance response. Also, the optimum levels of process parameters have been obtained as peak current – 6 Amp, pulse-ON-time – 100µs, gap voltage – 70V and SiC nano powder concentration – 0.5g/L.
Page(s): 356-362
ISSN: 0975-1017 (Online); 0971-4588 (Print)
Appears in Collections:IJEMS Vol.26(5&6) [October & December 2019]

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