Journal of Japan Foundry Engineering Society
Online ISSN : 2185-5374
Print ISSN : 1342-0429
ISSN-L : 1342-0429
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Volume 76, Issue 5
Displaying 1-5 of 5 articles from this issue
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Research Article
  • Analysis of Residual Deformation of Spheroidal Graphite Cast Iron by Elasto-Plastic VOXEL-FEM
    Akihiro Sato, Jun Iwane, Sukeharu Nomoto, Itsuo Ohnaka
    2004 Volume 76 Issue 5 Pages 359-365
    Published: May 25, 2004
    Released on J-STAGE: February 01, 2011
    DOIhttps://doi.org/10.11279/jfes.76.359
    JOURNAL FREE ACCESS
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      Analyses of the residual deformation of spheroidal graphite (SG) cast iron castings by sand mold casting were performed by the elastic perfectly plastic volume pixel finite element method (VOXEL-FEM) taking into account volumetric expansion due to graphite growth and thermal expansion, The elastic perfectly plastic assumption was applied to the deformation of the casting, Furthermore, it was also assumed the only hydrostatic pressure occurs in the liquid phase to consider coexistence of solid and liquid phases in castings during the solidifying process. The calculated results showed good agreement with the experimental results qualitatively, and this fact confirms that the method is useful for predicting residual deformation such as external shrinkage. In order to investigate effects of mold/casting interactions, further calculations were carried out with or without constraint conditions intended to simulate rigid molds, and the results were compared with experimental data.
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  • Three-Dimensional Shape Factors of Graphites in Spheroidal Graphite Cast Iron
    Masashi Hashiura, Atsushi Nishiwaki, Yuji Kataoka
    2004 Volume 76 Issue 5 Pages 366-373
    Published: May 25, 2004
    Released on J-STAGE: February 01, 2011
    DOIhttps://doi.org/10.11279/jfes.76.366
    JOURNAL FREE ACCESS
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      Metal is composed of microstructure elements, for example, precipitates. The form and distribution of microstructure elements are related to mechanical properties. However, data measured is two-dimensional data generally obtained from a cross section of a specimen, while in fact, precipitates distribute over three-dimensional space of the specimen.
      In this research, three-dimensional images of graphites in spheroidal graphite cast iron were constructed on a personal computer, and the surface area and volume of graphites were obtained. In order to determine the conditions of three-dimensional image construction, virtual spheroidal graphite cast iron was used.
      Three-dimensional shape factor distribution was also compared with two-dimensional, and the three-dimensional shape factor showed a wide range and a low peak value.
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  • Mold Filling Simulation with Consideration of Backpressure
    Akihiko Kimatsuka, Itsuo Ohnaka, Jin-Dong Zhu, Tetsutaro Ohmichi
    2004 Volume 76 Issue 5 Pages 374-379
    Published: May 25, 2004
    Released on J-STAGE: February 01, 2011
    DOIhttps://doi.org/10.11279/jfes.76.374
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      In case of mold filling, it is important to consider gas escape through the mold, gas vents and gas generation on the mold surface during mold filling. The pressure in the cavity increases due to the compression of the gas by the melt, affecting the mold filling behavior. Furthermore, the melt entraps gas or air in the die cavity. This paper presents a method to simulate the mold filling process taking into consideration backpressure and gas escape. The governing discrete equations for the momentum and mass conservation laws were derived by the DFDM (Direct-Finite-Difference-Method), and the staggered elements were used in the momentum conservation equation. Assuming that the gas in the cavity is ideal, the gas-flow in the mold was taken to follow the D'Arcy law. Simulated mold filling patterns agreed comparatively well with the results directly observed on an X-ray apparatus.
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  • Molten Metal Removal in Initial Stage of Laser Drilling
    Toshiyuki Miyazaki, Yoshihiro Kataoka, Tatsuya Yoshinaka, Michihiro Ko ...
    2004 Volume 76 Issue 5 Pages 380-385
    Published: May 25, 2004
    Released on J-STAGE: February 01, 2011
    DOIhttps://doi.org/10.11279/jfes.76.380
    JOURNAL FREE ACCESS
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      Laser drilling of metals is mainly performed by molten metal removal. Relationships between drilling characteristics and laser conditions have not been obtained both analytically and numerically. In the present paper, drilling characteristics in the initial stage are discussed on the basis that material is removed in the molten state. The calculation procedure is based on the finite difference method of heat conduction, which includes the thermal property dependence on the temperature and latent heat of fusion. Changes in hole depth and diameter with pulse duration time, pulse number in repeated drilling, beam radius, etc. were obtained for some beam conditions. The results show a similar tendency to experimental results. The calculation procedure described is useful for determining and predicting operation conditions in actual production lines.
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