中國有色金屬學報(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 19 Special 1 September 2009 |
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 R—C 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
