Study on thinning of a boron-doped polycrystalline diamond wheel-tool by micro rotary w-EDM approach

Shun-Tong Chen, Chih Hsien Chang

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

4 Citations (Scopus)

Abstract

This study presents a novel approach for using a micro rotary wire Electrical Discharge Machining (micro w-EDM) to thin the grinding-edge of a wheel-tool made from boron-doped polycrystalline composite diamond (PCD). For thinning the PCD, two discharge circuits (a Resistance-Capacitance (RC) circuit and a transistor) were used as power sources to obtain a grinding-edge of less than 10 μm in thickness and high surface quality. The wheel-blank is vertically mounted on a spindle and while rotating is thinned by micro w-EDM along a planned computer numerically controlled path. Experimental results verify that boron-doped PCD can be successfully thinned down to 5 μm in edge-thickness. The study shows it is possible to break (cut) diamonds of 10-μm grain size, leaving smooth surface-exposed diamonds at the cutting edge of the wheel tool. The dimensional and geometrical accuracy of the wheel-tool can be exactly controlled. Raman analysis reveals graphitizing of the PCD caused by local high temperature spark erosion at a peak of 1593 cm-1 in RC discharge circuit machining. The peak at 1332 cm-1 for the transistor circuit method indicates diamond sp3 structure. The surface degenerating layer produced by transistor circuit machining gives a suitably thin grinding edge with exposed diamond grains.

Original languageEnglish
Title of host publicationAdvanced Materials and Process Technology
Pages2167-2170
Number of pages4
DOIs
Publication statusPublished - 2012 Dec 10
Event2nd International Conference on Advanced Design and Manufacturing Engineering, ADME 2012 - Taiyuan, China
Duration: 2012 Aug 162012 Aug 18

Publication series

NameApplied Mechanics and Materials
Volume217-219
ISSN (Print)1660-9336
ISSN (Electronic)1662-7482

Other

Other2nd International Conference on Advanced Design and Manufacturing Engineering, ADME 2012
CountryChina
CityTaiyuan
Period12/8/1612/8/18

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Keywords

  • Boron-doped pcd
  • Discharge circuit
  • Micro rotary w-edm
  • Wheel-tool

ASJC Scopus subject areas

  • Engineering(all)

Cite this

Chen, S-T., & Chang, C. H. (2012). Study on thinning of a boron-doped polycrystalline diamond wheel-tool by micro rotary w-EDM approach. In Advanced Materials and Process Technology (pp. 2167-2170). (Applied Mechanics and Materials; Vol. 217-219). https://doi.org/10.4028/www.scientific.net/AMM.217-219.2167