Comparative study on discharge conditions in micro-hole electrical discharge machining of tungsten carbide (WC-Co) material

作     者：Hyun-Seok TAK Chang-Seung HA Dong-Hyun KIM Ho-Jun LEE Hae-June LEE Myung-Chang KANG 

作者机构：National Core Research Center for Hybrid Materials SolutionPusan National University Department of Electrical EngineeringPusan National University 

出 版 物：《中国有色金属学会会刊：英文版》 (Transactions of Nonferrous Metals Society of China)

年 卷 期：2009年第19卷第B09期

页      面：114-118页

核心收录：

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

基　　金：supported by a Grant-in-aid for the National Core Research Center Program from MOST and KOSEF, Korea (No.R15-2006-022-01001-0) partly supported by Pusan National University Research Grand,2008 

主　　题：电火花加工 碳化钨钴 难切削材料 硬质合金 放电 扫描电子显微镜 微孔 模具行业 

摘      要：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.