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Open AccessArticle

Study on the Discharge Characteristics of Single-Pulse Discharge in Micro-EDM

1
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
2
Key Laboratory of High Efficiency and Clean Mechanical Manufacture of Ministry of Education, School of Mechanical Engineering, Shandong University, Jinan 250061, China
3
School of Mechanical Engineering, Nanjing Institute of Technology, Nanjing 211100, China
*
Author to whom correspondence should be addressed.
Micromachines 2020, 11(1), 55; https://doi.org/10.3390/mi11010055
Received: 13 November 2019 / Revised: 13 December 2019 / Accepted: 20 December 2019 / Published: 1 January 2020
(This article belongs to the Section D:Materials and Processing)
To further study the discharge characteristics and machining mechanism of micro-electrical discharge machining (micro-EDM), the variation trends of the discharge energy and discharge crater size with actual discharge duration are discussed based on single-pulse experiments. The polarity effect of micro-EDM was analyzed according to the motion characteristics of electrons and ions in the discharge plasma channel. The results show that the discharge current and voltage of micro-EDM were independent of the discharge width and open-circuit voltage. The energy utilization rate of the short-pulse discharge was relatively high, and the energy utilization rate decreased gradually as the discharge duration increased. Even if the mass of the positive ion was much larger than that of the electron, the kinetic energy of the positive ion was still less than that of the electron when bombarding the surface of the electrode. The acceleration and speed of electrons were very high, and the number of times that electrons bombarded the surface of positive electrode was more than 600 times that of positive ions bombarding the surface of the negative electrode during the same time. View Full-Text
Keywords: micro-EDM; single pulse; discharge characteristic; polarity effect micro-EDM; single pulse; discharge characteristic; polarity effect
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MDPI and ACS Style

Liu, Q.; Zhang, Q.; Zhang, M.; Yang, F. Study on the Discharge Characteristics of Single-Pulse Discharge in Micro-EDM. Micromachines 2020, 11, 55.

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