Journal of The Japan Society of Electrical Machining Engineers
Online ISSN : 1881-0888
Print ISSN : 0387-754X
ISSN-L : 0387-754X
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Volume 53, Issue 132
Displaying 1-2 of 2 articles from this issue
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Paper
  • Fabrication of Polycrystalline Diamond Three-dimensional Structures by Sinking EDM Using Carbon Diffusion Reaction
    Shimpei KASAI, Tomoki SODETAI, Jiwang YAN
    Article type: Paper
    2019 Volume 53 Issue 132 Pages 5-11
    Published: 2019
    Released on J-STAGE: April 03, 2020
    DOIhttps://doi.org/10.2526/jseme.53.5
    JOURNAL FREE ACCESS
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    In our previous report, the electrical discharge machining (EDM) of polycrystalline diamond (PCD) using a carbon diffusion reaction with transition metal electrodes was proposed. The material removal rate and surface roughness were improved using a rotary cupronickel electrode for finish machining. In this work, we performed sinking EDM of PCD with a piezo-electrically vibrated cupronickel electrode for microstructure generation. Results showed that the material removal rate was improved by 2.3 times compared with a copper electrode even in rough machining. By observation of the machined surface and removed debris, it was found that molten cupronickel induced the carbon diffusion reaction and the promoted graphitization of diamond grains. Precise three-dimensional structures of PCD were successfully fabricated by vibration-assisted sinking EDM using the cupronickel electrode.

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  • Electrical Discharge Machining and Grinding of SiC Single Crystal Using a Disc-type Hybrid Tool of Polycrystalline Diamond
    Tomoko KUROSAWA, Jiwang YAN
    Article type: Paper
    2019 Volume 53 Issue 132 Pages 12-18
    Published: 2019
    Released on J-STAGE: April 03, 2020
    DOIhttps://doi.org/10.2526/jseme.53.12
    JOURNAL FREE ACCESS
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    Silicon carbide (SiC) single crystal was machined using a disc-type hybrid tool of polycrystalline diamond (PCD). The tool can be used to perform electrical discharge machining (EDM) as a roughing process and grinding as a finishing process. The width of the discharge gap and the thickness of the resolidified layer caused by EDM were measured, the results of which were then used to optimize the subsequent grinding conditions. As a result, ductile mode grinding was realized by removing the EDM-induced resolidified layer completely. In addition, a low surface roughness was obtained after grinding by utilizing the electrical discharges in EDM to dress the PCD tool surface. Finally, high surface integrity and productivity were successfully sustained by optimizing the EDMgrinding cycles.

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