MATEC Web Conf.
Volume 70, 20162016 The 3rd International Conference on Manufacturing and Industrial Technologies
|Number of page(s)||4|
|Section||Material Properties and Processing|
|Published online||11 August 2016|
Effect of Graphite Electrode to Surface’s Characteristic of EDM
1 Faculty of Engineering, Thammasat University, Pathum Thani, 12120, Thailand
2 National Metal and Materials Technology Center (MTEC), Pathum Thani, 12120, Thailand
Electrical discharge machining process (EDM) is a process for removing material by the thermal of electrical discharge. Some of the melted and all of the evaporated material is then quenched and flushed away by dielectric liquid and the remaining melt recast on the finished surface. The recast layer is called as white layer. Beneath the recast layer, a heat affected zone is formed. The quality of an EDM product is usually evaluated in terms of its surface integrity, which is characterized by the surface roughness, existence of surface cracks and residual stresses. This paper presents a study of surface’s characteristics by EDM in de-ionized water due to decarbonisation. The machining tests were conducted on mild steel JIS grade SS400 with copper and graphite electrodes. The workpiece surfaces are analyzed by scanning electron microscope and XRD technique. The carbon transfers from graphite electrode to the white layer relating to martensitic phrase of recast layer.
© The Authors, published by EDP Sciences, 2016
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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