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research-article

Analytical Simulation of Random Textures Generated in Electrical Discharge Texturing

[+] Author and Article Information
Jithin S

Department of Mechanical Engineering, Indian Institute of Technology Bombay, Mumbai – 400076, India
jithin_s@iitb.ac.in

Upendra Bhandarkar

Department of Mechanical Engineering, Indian Institute of Technology Bombay, Mumbai – 400076, India
bhandarkar@iitb.ac.in

Suhas S. Joshi

Department of Mechanical Engineering, Indian Institute of Technology Bombay, Mumbai – 400076, India
ssjoshi@iitb.ac.in

1Corresponding author.

ASME doi:10.1115/1.4037322 History: Received March 01, 2017; Revised July 11, 2017

Abstract

Textured functional surfaces are finding applications in the fields of bioengineering, surface energy, hydrodynamics, lubrication and optics. Electrical discharge machining (EDM) which is normally used to generate smoother surface finish on various automotive components and toolings, can also generate surfaces of rough finish, a desirable characteristic for texturing purposes. There is a lack of modeling efforts to predict the surface textures obtained under various EDM operating conditions. The aim of the current work is to capture the physics of the electrical discharge texturing on a surface assuming random generation of multiple sparks with respect to i) space, ii) time, and iii) energy. A uniform heat disc assumption is taken for each individual spark. The 3D texture generated is utilized to evaluate a 3D roughness parameter namely arithmetic mean height, S_a. Surface textures obtained from the model are validated against experimentally obtained ones by comparison of distribution of R_a values taken along parallel sections along the surface. It was found that the distribution of simulated R_a values agree with that of experimental R_a values.

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