Journal of the Japan Society for Abrasive Technology
Online ISSN : 1880-7534
Print ISSN : 0914-2703
ISSN-L : 0914-2703
Volume 51, Issue 5
MAY.
Displaying 1-4 of 4 articles from this issue
  • Zhongjun QIU, Libo ZhOU, Hirotaka OJIMA, Hiroshi EDA, Toru IMAI, Masat ...
    2007 Volume 51 Issue 5 Pages 284-289
    Published: May 01, 2007
    Released on J-STAGE: May 18, 2009
    JOURNAL FREE ACCESS
    With comprehensive applications in precision optical and electronic components, the demands for profiled single-crystalline diamond turning tools are increasing. Currently, most single-point diamond turning tools used for turning are still manufactured manually. The profile accuracy of the diamond cutting edge is dependent on the operator's experience and skill. Thus, it is necessary to automate the process to improve stability. In this study, a fully automated grinding system was developed to generate R-profile diamond turning tools, controlled by a vision system. The profile of the diamond turning tools is captured in real-time via a CCD camera. Deviation from the ideal profile is calculated and converted into a pulse train for feedback control. The grinding system is then able to remove the unnecessary portion of the cutting edge selectively to achieve high quality and high productivity.
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  • Weimin LIN, Yutaka WATANABE, Shin-ya MORITA, Yoshiohiro UEHARA, Hitosh ...
    2007 Volume 51 Issue 5 Pages 290-295
    Published: May 01, 2007
    Released on J-STAGE: May 18, 2009
    JOURNAL FREE ACCESS
    A new CAD system, Volume-CAD (VCAD), has been developed. We carried out research and development of the VCAD fabrication process based on VCAD/CAM precision control. In this study, the developed V-CAM or nanoprecision V-CAM (Nano V-CAM) was used in manufacturing inspection of asphelical lenses or free-form surfaces to determine system performance. These have been used in a fundamental experiment to investigate polishing of a free-form surface. The relationship between NC resolution and form accuracy of polished surface are discussed.
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  • Theoretical analysis and the experimental investigation
    Xijun KANG, Jun'ichi TAMAKI, Akihiko KUBO, Yuji MACHIDA, Katsutoshi TA ...
    2007 Volume 51 Issue 5 Pages 296-301
    Published: May 01, 2007
    Released on J-STAGE: May 18, 2009
    JOURNAL FREE ACCESS
    The mechanism of "cutting edge truncation," which has been proposed as an effective means to achieve ductile mode grinding of hard and brittle materials and/or mirror-finish grinding of aluminum, was analyzed by Monte Carlo simulation. The results of theoretical analysis indicated that the ground surface roughness was significantly improved by aligning the cutting edge height and flattening the cutting edge shape. The maximum grain depth of cut also decreased due to the effect of decreasing the cutting edge interval, although there were limits to the effect. The results of grinding experiments indicated that excessive flattening of the cutting edge shape caused deterioration of the ground surface in the case of ductile materials, while in the case of hard and brittle materials, proper selection of grinding conditions is required to achieve the ductile mode grinding.
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  • 1st report:Improvement of performance of an aerostatic bearing spindle with an annular restrictor
    Katsutoshi TANAKA, Seiji KIMURA, Kiyoshi SUZUKI, Tetsutaro UEMATSU
    2007 Volume 51 Issue 5 Pages 302-307
    Published: May 01, 2007
    Released on J-STAGE: May 18, 2009
    JOURNAL FREE ACCESS
    This study clarified the characteristics regarding the rigidity, accuracy, heat generation, etc., of aerostatic bearing spindles. Type A and B aerostatic bearing spindles with annular restrictors were manufactured for the test, and the material of the bearings were made from a type of carbon. This paper presents methods for evaluation of run out and imbalance correction of the spindles. In addition, the optimum clearance for hole diameter of the restrictors and effects of balancing and thermal deformation for heat generation were examined by experiment. The results clarified the points where attention should be focused when aerostatic bearing spindles are applied to ultra-precision machine tools. Moreover, improvement of rigidity and reduction of air consumption of the spindles were confirmed by applying restrictors of smaller diameter (φ0.05 mm).
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