Influences of Powder mixed Dielectric Fluid on Machining Characteristics of EDM processed parts: A review

Abstract

The effective application of any machining process relies on its ability to machine the part/material with high efficiency and with better surface finish. Electrical discharge machining is considered as a non-conventional method of machining which is well established and is used for the manufacture of parts which have geometrically complex shapes and intricate profiles. This machining technique came out for the process of making dies and mere tools for the other manufacturing process. From several years various researches are going on to ameliorate the process parameters which consists of characteristics such as surface roughness (SR), Material Removal Rate (MRR) and tool wear rate (TWR) etc. One of the process that came up with the advancement in capabilities of the EDM process is Powder Mixed Electrical Discharge Machining (PMEDM). The presence of fine metal particles in the dielectric fluid enhance its properties. It includes the increase in the spark gap between the tool electrode and the work and also the reduction in the insulating strength. This increases the surface finish and material removal rate and the process becomes more stable. The present paper brings in the review of research done by several authors across the world to enhance the capabilities of EDM by adding powder mixed dielectric as working fluid. The behaviour of several powders when mixed with the dielectric fluid (working fluid) have been studied and observed by many researchers.