MRR Improvement in Sinking Electrical Discharge Machining: A Review

Abstract

Electrical discharge machining (EDM) is one of the earliest non-traditional machining processes. EDM process is based on thermoelectric energy between the workpiece and an electrode. Material removal rate (MRR) is an important performance measure in EDM process. Since long, EDM researchers have explored a number of ways to improve and optimize the MRR including some unique experimental concepts that depart from the traditional EDM sparking phenomenon. Despite a range of different approaches, all the research work in this area shares the same objectives of achieving more efficient material removal coupled with a reduction in tool wear and improved surface quality. The paper reports research on EDM relating to improvement in MRR along with some insight into mechanism of material removal. In the end of the paper scope for future research work has been outlined.

Experimental study of the effects of wire EDM on the characteristics of ferritic steel, at a micro-scale on the contour cut surface

“…Consequently, it generates no cutting force, in contrast to other conventional cutting methods. Because very little heat is generated either, it does not deform the cut surface, further reducing mechanical stresses and entirely eliminating vibration problems that can occur with other methods (such as fine wire abrasive cutting) [11].…”

Prediction of Material Removal Rate in Die-sinking Electrical Discharge Machining

“…Most researchers consider peak current and on-time separately rather than combining them when studying the workpiece material removal rate (MRR). Ojha et al (2010) wrote a comprehensive review of how MRR can be enhanced. The paper concluded that MRR improved with a higher gap voltage, peak current, and on-time.…”

Optimization of Surface Roughness in Precision Finish Cut Edm Using Taguchi Approach

“…In the literature review it is observed that the ranges of the EDM process variables are too large and differs from actual practices carried out in Industrial tool room. [7,8,9] Therefore the paper incorporates the results obtained as per actual parametric setting followed by machinists on the die sink EDM practices. Machinability leads to improper surface textures due to lack of availability of surface roughness information.…”