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Open AccessArticle

Surface Integrity of Micro EDM Surface Using Electrodes of Various Diameters

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Key Laboratory of Laser Green Intelligent Manufacturing Technology, Shandong Research Center of Laser Green and High Efficiency Intelligent Manufacturing Engineering Technology, Qingdao University of Technology, Qingdao 266520, China
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School of Electrical and Electronic Engineering, Shandong University of Technology, Zibo 255049, China
*
Authors to whom correspondence should be addressed.
Coatings 2019, 9(12), 805; https://doi.org/10.3390/coatings9120805
Received: 30 October 2019 / Revised: 19 November 2019 / Accepted: 26 November 2019 / Published: 1 December 2019
(This article belongs to the Section Surface Characterization, Deposition and Modification)
The surface integrity of a micro electrical discharge machining (micro EDM) surface represents the surface quality of workpiece. The surface quality of micro EDM can be further improved by clarifying the machining mechanism and optimizing processing technology. In this paper, experiments were carried out to investigate the influence of the tool electrode diameter on the machined surface integrity of micro EDM. The evolutions of the tool diameter on the micro topography, element migration, and surface roughness of workpiece surface machined in pure water and EDM oil were illustrated. The results show that the surface roughness Ra decreases as the tool electrode diameter increased, regardless of the open circuit voltage and dielectric type, owing to the skin effect. The good fluidity and cooling property of pure water and the effect of electrochemical corrosion cause the surface roughness Ra of surface machined in pure water is much larger than that machined in EDM oil. Tool material migrates to the workpiece surface during the micro EDM process, whether pure water or EDM oil is adopted as the working medium. The influence of electrode size on the Cu content of the workpiece surface shows no significant trend. Pure water is more suitable for high efficiency, low-precision micro EDM, while EDM oil is better for high-precision micro EDM. View Full-Text
Keywords: micro EDM; surface integrity; electrodes; diameters; dielectric micro EDM; surface integrity; electrodes; diameters; dielectric
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MDPI and ACS Style

Liu, Q.; Yang, F.; Sun, S.; Yang, M.; Shao, J. Surface Integrity of Micro EDM Surface Using Electrodes of Various Diameters. Coatings 2019, 9, 805.

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