Journal of the Japan Society for Abrasive Technology
Online ISSN : 1880-7534
Print ISSN : 0914-2703
ISSN-L : 0914-2703
Volume 60, Issue 5
Displaying 1-3 of 3 articles from this issue
  • Rei SEKIGUCHI, Yuta MIZUMOTO, Shun YOSHIKAWA, Yasuhiro KAKINUMA, Masah ...
    2016 Volume 60 Issue 5 Pages 254-260
    Published: May 01, 2016
    Released on J-STAGE: November 25, 2016
    JOURNAL FREE ACCESS
    Large-aperture lenses with diameter > 200 mm for single-lens reflex cameras and television cameras are manufactured by grinding and finish-polishing. In terms of productivity, after the glass lens is shaped by grinding, micro-cracks and grinding traces are removed by polishing sufficiently to be satisfactory to the demands of commercial products. However, the total depth of polishing reaches approximately 10 μm, and prolonged polishing causes deterioration of form accuracy of the lens. Hence, it is necessary to perform ductile-mode grinding efficiently to prevent crack initiation. This study was performed to achieve efficient ductile-mode grinding over the whole optical glass lens. In this paper, a novel ductile-mode grinding method involving control of tool feed rate and workpiece velocity at the same time is proposed, and the grinding performance is evaluated.
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  • 3rd Report: Influence of water content in polishing media on polishing mechanism
    Masahiro FUKUMOTO, Kazuteru TAKAI, Nizar MOHD, Naoya ARIMATSU, Masao U ...
    2016 Volume 60 Issue 5 Pages 261-266
    Published: May 01, 2016
    Released on J-STAGE: November 25, 2016
    JOURNAL FREE ACCESS
    Our previous study showed that under constant kinetic energy of polishing media, higher polishing rate is achieved in media with the lowest water content, while the saturated surface roughness increases in such media. To verify this unique polishing phenomenon, the influence of water content in polishing media on the polishing mechanism was investigated in the present study. The results revealed that the surface hardness of the cemented carbide substrate increases with higher injection speed of the media. This indicates that, although the abrasive grain surface removal force is high under higher injection speed, it becomes less likely to bite deep into the substrate surface due to the greater hardness increase of the substrate, which is induced by the water content in the polishing media. In addition, the effect of water content on the elasticity of the polishing media was evaluated and how the elasticity affects the impact force during the collision was examined. The results indicated that the optimum combination of water content and injection speed becomes an essential principle for the moderate blast polishing process.
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  • Daiki Yamamoto, Nobuhide itoh, Hitoshi Ohmori, Shinjiro Umezu
    2016 Volume 60 Issue 5 Pages 267-268
    Published: May 01, 2016
    Released on J-STAGE: November 25, 2016
    JOURNAL FREE ACCESS
    To realize on-demand manufacturing techniques, we have developed a new hybrid system that combines a 3D printer and liquid droplet abrasive technology PELID. Grinding wheels were built using this system and examined by grinding experiments. During the experiments, we found that the injection of abrasives into the grinding wheels can be controlled by combining ELID, and that the grinding wheels improve the surface roughness of the work. These results confirm that the new system is able to build ELID grinding wheels.
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