Abstract
Dry EDM may be a modification of the traditional electrical discharge machining (EDM) process during which the liquid dielectric is replaced by a gaseous medium. High velocity gas is supplied through it into the discharge gap. The flow of high velocity gas into the gap facilitates removal of debris and prevents excessive heating of the tool and work piece at the discharge spots. it's now known that aside from being an environment–friendly process, other advantages of the dry EDM process are low tool wear, lower discharge gap, lower residual stresses, smaller white layer and smaller heat affected zone.[1]
 Keeping literature review into consideration, during this research, an effort has been made by selecting compressed gas as a dielectric medium, with Hastelloy as a work piece material and copper as a tool electrode. Conventional experiments were also performed. Experiments are performed using Taguchi DoE orthogonal array to watch and analysis the consequences of various process parameters to optimize the response variables like material removal rate (MRR) and gear wear rate (TWR).
Highlights
Cleaner production has become a worldwide topic thanks to global environmental problems caused by the consumption of natural resources and the pollution resulting from the assembly of technical products
The material removal rate (MRR) of AISI 304 chrome steel during this promising dry machining method might be as high as 5162 mm3/min, which improved the MRR by 2nd to 3rd order of magnitude compared thereupon of conventional dry electrical discharge machining (EDM)
Therein they conclude MRR is lower with tool electrode as a positive polarity compared with the negative polarity, during this polarity of the tool electrode is positive MRR is higher, within the case of EDM during a liquid
Summary
Cleaner production has become a worldwide topic thanks to global environmental problems caused by the consumption of natural resources and the pollution resulting from the assembly of technical products. These have led to increasing political pressure and stronger regulations being applied to both the users and makers of such products. Adopting sustainable manufacturing practices offer the likelihood for ‘difficult to machine’ materials machining companies to enhance their economic and environmental performance simultaneously. Several researchers have tried to enhance the MRR of EDM of Hastelloy, like combined with ultrasonic machining and developed a replacement electrode, but the effect wasn't obvious. The MRR of AISI 304 chrome steel during this promising dry machining method might be as high as 5162 mm3/min, which improved the MRR by 2nd to 3rd order of magnitude compared thereupon of conventional dry EDM
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