Experimental investigation of the effect of EDM parameters and dielectric type on the surface integrity and topography

The electrical discharge machining (EDM) process is mostly used in conditions that complex and intricate shapes need to be machined on very hard metals. However, the leaves behind some undesirable properties such as high surface roughness, rough topography, residual tensile stresses, micro-cracks, heat-affected zone (HAZ), recast layer. This paper investigates effects of different output parameters listed above. input studied include current, pulse-on time, type dielectric; material being AISI 1045 steel. Results show deionized water improved variables EDM. use dielectric, not only surfaces’ topography but also lowered micro-cracks HAZ thickness. experiments how current time affect outcome EDM