An Experimental Study on Electrical Discharge Machining of Manganese–Zinc Ferrite Magnetic Material

Abstract

The objective of this research is to investigate the machining characteristics of manganese–zinc (Mn–Zn) ferrite magnetic material using electrical-discharge machining (EDM). The material removal rate, the surface topography, the surface roughness, the recast layer, and the chemical composition of the machined surface were studied in terms of EDM processing variables. Experimental results indicate that the morphology of debris revealed the mechanism of material removal. The surface microgeometry characteristics are not always uniform and homogenous and the EDM process produces much damage on the machined surface. The material removal rate, the surface roughness, and the recast layer are proportional to the applied discharge energy.

Keywords:

• Electrical-discharge machining
• Grain boundaries
• Magnetic permeability
• Material removal rate
• Microcracks
• Microvoids
• Mn–Zn ferrite
• Pulsed current
• Pulse-on duration
• Recast layer
• Surface roughness
• Surface topography