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A Study of Micro–EDM on Silicon Nitride Using Electrode Materials 1 ...

A Study of Micro–EDM on Silicon Nitride Using Electrode Materials 1 ...

A Study of Micro–EDM on Silicon Nitride Using Electrode Materials 1

International Transaction Journal ong>ofong> Engineering, Management, & Applied Sciences & Technologies International Transaction Journal ong>ofong> Engineering, Management, & Applied Sciences & Technologies http://www.TuEngr.com, http://go.to/Research A ong>Studyong> ong>ofong> Micro–EDM on Silicon Nitride Using Electrode Materials Apiwat Muttamara a* , Pichai Janmanee b and Yasushi Fukuzawa c a,b Department ong>ofong> Industrial Engineering Faculty ong>ofong> Engineering, Thammasat University, THAILAND b Department ong>ofong> Industrial Engineering Rajamangala University ong>ofong> Technology Krungthep, THAILAND c Department ong>ofong> Mechanical Engineering Faculty ong>ofong> Engineering, Nagaoka University ong>ofong> Technology, JAPAN A R T I C L E I N F O Article history: Received 1 August 2010 Received in revised form 23 August 2010 Accepted 27 August 2010 Available online 10 September 2010 Keywords: Electrical discharge machining (EDM) Microelectrodes Wear; electrode wear ratio (EWR) Micro-EDM A B S T RA C T This research proposes Cu, CuW and AgW for electrode materials for micro-electro-discharge machining (micro-EDM), which are produced with block electrode on insulating Si 3 N 4 . With these electrodes, some trials were evaluated considering the EDM conditions. The machining properties were estimated by the removal rate and tool wear ratio. The same phenomena are applied at the micron level for micro machining. The conductive layer was investigated on the micro-hole. This study aimed at the minimum ong>ofong> discharge energy to generate the conductive layer resulting to success micro-EDM on insulating ceramics. 2010 International Transaction Journal ong>ofong> Engineering, Management, & Applied Sciences & Technologies. Some Rights Reserved. 1. Introduction The advanced materials, such as engineering ceramics, are normally difficult to machine with traditional techniques. In addition, a higher cost for machining these materials would be expected. The technology ong>ofong> electrical discharge machining (EDM) is a non-conventional nonmechanical contact machining technology that is widely employed for electrically conductive materials, irrespective ong>ofong> their hardness. Moreover, engineering ceramics such as ZrO 2 ,Al 2 O 3 *Corresponding author (A.Muttamara). Tel/Fax: +66-2-5643001 Ext.3189. E-mail addresses: mapiwat@engr.tu.ac.th 2010. International Transaction Journal ong>ofong> Engineering, Management, & Applied Sciences & Technologies. Volume 1 No.1. eISSN: 1906-9642 Online Available at http://tuengr.com/V01-01/01-01-001-007{Itjemast}_Apiwat.pdf 1

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