Experimental investigation into portable near dry EDM
DOI:
https://doi.org/10.58368/MTT.22.6.2023.28-34Keywords:
NDEDM, SEM, EDS, MRR, Process Parameter, MicrostructureAbstract
The Near Dry Electric Discharge Machining (NDEDM) process is becoming increasingly used now a days due to its suitability to produce complicated geometries and machining of materials with high mechanical properties. Experimental designs were created by using central composite design method & experiments were performed by using a copper (ρ 8.9 gram per cm cube) tool and EN31 Die steel (ρ 7.8 gram per cm cube) workpiece. The influence of gap voltage, discharge current and pulse on time on the material removal rate of EN31 Die steel has been analysed. The tool electrode was designed as a tube to allow high, velocity gas to flow through from it. A tool was used to deliver high pressure air from the air compressor into the discharge gap. This work presents a series of findings that allow optimizing the starting parameters of the process to increase the useful life of the tool, increase the MRR. The result outcome shows that discharge current followed by pulse on current has the major influence on the MRR of EN31 Die steel.
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