Effects of electrical discharge machining conditions on thermal damage in polycrystalline diamond

Kazunori Watanabe, Jiwang Yan

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Polycrystalline diamond (PCD) is widely used to fabricate cutting tools. In the electrical discharge machining (EDM) of PCD, thermal damage, such as graphitization of diamond grains, is a critical problem. In this study, we performed EDM of PCD using rotary cupronickel electrodes and investigated the structural changes of PCD by Raman spectroscopy. It was found that the PCD surfaces machined using the rotary cupronickel electrodes were smoother than those in conventional EDM. The results also showed that diamond graphitization decreased when electrical discharge energy decreased and/or when feed rate increased. In order to reduce graphitization of diamond, we proposed a dry EDM finishing method for PCD. Very low surface roughness and low thermal damage were successfully achieved.

Original languageEnglish
Title of host publicationProceedings of the 8th International Conference on Leading Edge Manufacturing in 21st Century, LEM 2015
PublisherJapan Society of Mechanical Engineers
Publication statusPublished - 2015 Oct 18
Event8th International Conference on Leading Edge Manufacturing in 21st Century, LEM 2015 - Kyoto, Japan
Duration: 2015 Oct 182015 Oct 22

Other

Other8th International Conference on Leading Edge Manufacturing in 21st Century, LEM 2015
CountryJapan
CityKyoto
Period15/10/1815/10/22

Keywords

  • Electrical discharge machining
  • Graphitization
  • Polycrystalline diamond
  • Subsurface damage

ASJC Scopus subject areas

  • Industrial and Manufacturing Engineering

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  • Cite this

    Watanabe, K., & Yan, J. (2015). Effects of electrical discharge machining conditions on thermal damage in polycrystalline diamond. In Proceedings of the 8th International Conference on Leading Edge Manufacturing in 21st Century, LEM 2015 Japan Society of Mechanical Engineers.