Journal of the Japan Society for Abrasive Technology
Online ISSN : 1880-7534
Print ISSN : 0914-2703
ISSN-L : 0914-2703
Volume 53, Issue 10
OCT.
Displaying 1-4 of 4 articles from this issue
  • Dai WAKISAKA, Tadahiro UEKI, Junji SHIBATA, Tetsuo FUJIMOTO
    2009 Volume 53 Issue 10 Pages 615-620
    Published: October 01, 2009
    Released on J-STAGE: July 09, 2010
    JOURNAL FREE ACCESS
    To form three-dimensional foamed polystyrene models, cutting by milling has been used exclusively in engineering. With recent increases in the demands for processing in rapid prototyping, evaporative pattern casting, etc., improvements of the production speed are urgently required. In this study, we examined hot wire cutting, which has the advantage that it can not only cut the final shape to form in a single cutting pass, but it is also easy to collect and dispose of the chips. Therefore, we investigated a new processing method for the production of foamed polystyrene models using a hot wire tool. First, we obtained an approximation of the ruled surface, which was the aggregate of the straight line so that the wire tool can generate a curved surface. Next, software was developed to provide the NC data, which allowed the wire tool to be traced along these line elements through rotational transformation matrix theory. Then, we performed 3-dimensional processing tests to form foamed polystyrene models on a 5-axis controlling machine tool equipped with a Nichrome wire tool. Finally, we confirmed experimentally that it is possible to form warped surfaces of the required shape by hot-wire cutting.
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  • – A consideration of the EPD cut-off mechanism –
    Junichi IKENO, Yasuhiro TANI
    2009 Volume 53 Issue 10 Pages 621-626
    Published: October 01, 2009
    Released on J-STAGE: July 09, 2010
    JOURNAL FREE ACCESS
    In a cutting process for hard and brittle material, prevention of chipping and realization of a smooth cut surface would allow omission of the polishing process and markedly improve productivity. A new cut-off method, "EPD cut-off," has been developed to realize these advantages. This paper described some experimental approaches to clarify the mechanism. The results indicated that an abrasive layer underwent repeated adsorption and falling off cycles and maintained a constant thickness. The relationship between destruction conditions and the AE signal was clarified. The following mechanism was suggested, i.e., the processing unit of EPD cut-off becomes small due to cutting with many fine abrasives. Therefore, chipping was prevented and the cut surface was smooth.
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  • –Effect of fiber direction on slicing characteristics–
    Michio UNEDA, Takashi NARISE, Yoshinori YAMASHITA, Ken-ichi ISHIKAWA
    2009 Volume 53 Issue 10 Pages 627-632
    Published: October 01, 2009
    Released on J-STAGE: July 09, 2010
    JOURNAL FREE ACCESS
    Carbon Fiber Reinforced Plastics (CFRP) are expected to be effective materials for use as mechanical and structural parts. For use in mechanical structural parts, it is necessary to slice or drill CFRP. Edge chipping and abrasion are dependent on the fiber direction of CFRP. This study was performed to establish and examine the practical applicability of the vibratory OD-blade slicing method to slice CFRP. We demonstrated the reducing effect on both slicing force and tool wear rate by vibratory slicing. Finally, we found that slicing accuracy is correlated to the CFRP fiber direction.
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  • Haruyo FUKUI, Shinya IMAMURA, Daiji TABAYASHI, Hideyuki YASUDA
    2009 Volume 53 Issue 10 Pages 633-638
    Published: October 01, 2009
    Released on J-STAGE: July 09, 2010
    JOURNAL FREE ACCESS
    The aim of this study was to verify the effects of linearly ramping substrate bias on microstructure and cutting performance of TiAlN coating. TiAlN film was deposited by linearly ramping substrate bias voltage from -50 V up to -150 V on a WC-Co substrate using the cathodic arc ion plating method. The film microstructure was evaluated by electron backscatter diffraction pattern (EBSP) analysis. EBSP observation showed that the column size decreased from about 500 nm at the substrate/film interface to less than 200 nm at the surface of the film. Especially, the microstructure changed markedly at the middle of the film (about -100 V). The milling performance of coated inserts was examined with AISI 1049 steel as a work material. In particular, the cutting inserts deposited at the linearly ramping substrate bias voltage showed enhancement of tool life and chipping resistance of the cutting edge by approximately twofold compared to when the substrate bias was kept constant in this test.
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