Journal of the Japan Society for Abrasive Technology
Online ISSN : 1880-7534
Print ISSN : 0914-2703
ISSN-L : 0914-2703
Volume 57, Issue 1
Displaying 1-5 of 5 articles from this issue
  • Investigation of drill wear and temperature during drilling
    Taiji FUNABIKI, Hiroyuki KODAMA, Eiichi AOYAMA, Toshiki HIROGAKI, Keij ...
    2013 Volume 57 Issue 1 Pages 27-32
    Published: January 01, 2013
    Released on J-STAGE: June 03, 2013
    JOURNAL FREE ACCESS
    This paper describes micro-drilling processes of printed wiring boards (PWBs) containing high-hardness and high-thermal conduction fillers. When processing these PWBs, drill tools show severe wear because the filler has high hardness. Therefore, we examined the characteristics of drill wear and showed the usefulness of diamond-coated drills. The diamond-coated drill is effective against PWBs with higher filler filling rate. Moreover, we investigated the cutting force and PWB temperature during drilling. Macroscopically, cutting force was seen to be more significantly influenced by drill wear compared to material physical properties. On the other hand, microscopically the PWB temperature during drilling was significantly influenced by material physical properties.
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  • -Effects of layer angle control on fracture resistance-
    Masato OKADA, Naoki ASAKAWA, Takashi OHKUBO
    2013 Volume 57 Issue 1 Pages 33-38
    Published: January 01, 2013
    Released on J-STAGE: June 03, 2013
    JOURNAL FREE ACCESS
    Functionally graded materials with different mechanical and thermally characteristics on two sides due to changes in the material composition have been applied in various fields. In this study, cutting performance on tool fracture was evaluated using a cutting tool with functionally graded material in which the interface angle is at right angles to the cutting force direction. Appropriate material characteristics for the cutting tool and cutting force direction were investigated experimentally, and an FEM model with the optimum composition material and interface angle was prepared. In the results of FEM analysis, the stress generated on the cutting edge in the FEM model with controlled interface angle was lower than in the case without such control. Consequently, fracture resistance of the cutting tool was improved in the real continuous and intermittent cutting experiment by control of the interface angle of the functionally graded layer, thus improving durability.
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  • Ippei TANAKA, Yoshihiro TAKAHASHI, Yukihirp SAKAMOTO
    2013 Volume 57 Issue 1 Pages 39-42
    Published: January 01, 2013
    Released on J-STAGE: June 03, 2013
    JOURNAL FREE ACCESS
    An investigation was carried out to determine the effects of CH4 flow rate on tribological properties of carbon nitride synthesized using plasma CVD. Comparison of AES spectra indicated that nitrogen content of the deposit increased with increasing CH4 flow rate. From the results of tribological properties estimation, the deposits with high nitrogen content showed high wear resistance and low wear of counterpart material when SUJ2 was used as the counterpart material.
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  • -Effects of hydrogen plasma etching-
    Inori SUGIURA, Yukihiro SAKAMOTO, Keizo OHTA
    2013 Volume 57 Issue 1 Pages 43-46
    Published: January 01, 2013
    Released on J-STAGE: June 03, 2013
    JOURNAL FREE ACCESS
    An investigation was carried out to determine the effects of hydrogen plasma etching for radical nitriding of cast iron. Nitriding reaction was inhibited by free carbon on the surface of cast iron. Therefore, cast iron substrates were pretreated by hydrogen plasma etching before radical nitriding. The Vickers hardness of the nitrided samples pretreated by hydrogen plasma etching with an applied voltage of -600 V was harder than that of similar samples with an applied voltage of -380 V. In addition, estimation on tribological properties indicated that the friction coefficients of all nitrided samples were almost the same as that of the untreated cast iron substrate.
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  • Ryo HAYASHI, Noboru MORITA, Shigeru YAMADA, Noboru TAKANO
    2013 Volume 57 Issue 1 Pages 47-52
    Published: January 01, 2013
    Released on J-STAGE: June 03, 2013
    JOURNAL FREE ACCESS
    The thrust force, one of the cutting forces, influences the form and dimensional accuracy of work materials and varies with the nose radius, approach angle, and depth of cut on the operation of turning. Adjusting these three conditions can be used to set the thrust force to 0 N. In this study, a graphite electrode was developed with a precision lathe. Optimizing these three conditions, which was achieved experimentally, enabled cutting of graphite with a thrust force of 0 N. Cutting of a graphite microshaft with a diameter of 50μm and a length of 1 mm was demonstrated. In addition, a microhole in a SUS304 plate was processed by electric discharge machining using the graphite shaft as the electrode.
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