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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 19    Special 1    September 2009

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Comparative study on discharge conditions in micro-hole electrical discharge machining of tungsten carbide (WC-Co) material
Hyun-Seok TAK1, Chang-Seung HA2, Dong-Hyun KIM2,
Ho-Jun LEE2, Hae-June LEE2, Myung-Chang KANG1

1. National Core Research Center for Hybrid Materials Solution, Pusan National University,
Busan, 609-735, Korea;
2. Department of Electrical Engineering, Pusan National University, Busan, 609-735, Korea

Abstract:WC-Co is used widely in die and mold industries due to its unique combination of hardness, strength and wear-resistance. For machining difficult-to-cut materials, such as tungsten carbide, micro-electrical discharge machining(EDM) is one of the most effective methods for making holes because the hardness is not a dominant parameter in EDM. This paper describes the characteristics of the discharge conditions for micro-hole EDM of tungsten carbide with a WC grain size of 0.5 μm and Co content of 12%. The EDM process was conducted by varying the condenser and resistance values. A RC discharge EDM device using arc erosion for micro-hole machining was suggested. Furthermore, the characteristics of the developed micro-EDM were analyzed in terms of the electro-optical observation using an oscilloscope and field emission scanning electron microscope.

 

Key words: micro-hole; electrical discharge machining; tungsten carbide; electro-optical observation

ISSN 1672-7029
CN 43-1423/U

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