Journal of Japan Foundry Engineering Society
Online ISSN : 2185-5374
Print ISSN : 1342-0429
ISSN-L : 1342-0429
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Volume 68, Issue 4
Displaying 1-8 of 8 articles from this issue
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Research Article
  • Effects of Coat on Cooling Capacity of Mold in Evaporative Pattern Casting Process Using Steel Shot as Packing
    Sadatoshi Koroyasu, Masao Matsuda
    1996 Volume 68 Issue 4 Pages 307-312
    Published: April 25, 1996
    Released on J-STAGE: February 01, 2011
    DOIhttps://doi.org/10.11279/jfes.68.307
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      The effects of the coat on the heat absorption of molds in the evaporative pattern casting process using steel shot as packing was investigated theoretically and experimentally. Analysis of one-dimensional heat conduction from the casting surface to the packed bed of steel shot through the coat was carried out and it was found that heat flux at casting surface was immediately depressed by the coat after pouring but that this effect was in significant after some time. The plate casting of aluminum alloy was casted by using steel shot in the evaporative pattern casting process. The experimental data showed solidification times of casting was slightIy increased as the thickness of coat increased.
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  • Effects of Vibration on Surface Layer Structure of Al-4.5mass%Cu Alloy Castings
    Hiroshi Shimizu, Hiromasa Takeuchi
    1996 Volume 68 Issue 4 Pages 313-318
    Published: April 25, 1996
    Released on J-STAGE: February 01, 2011
    DOIhttps://doi.org/10.11279/jfes.68.313
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      To investigate the effects of vibration on the surface layer of castings and ingots, the droplet of Al-4.5mass%Cu alloy was dropped on a cast iron plate vibrated at a frequency of 2.5∼60kHz, and the temperature change of droplet was measured using a thermocouple during solidification. Discs and predendrites were observed microscopically at the surface layer structure of the droplets. The number of disc and chill crystal formed on the surface of the droplet increased as the frequency increased, but the value of heat transfer coefficient at the droplet-chill plate interface was independent of the frequency. The dendrite arm spacing in the region from the surface of the droplet to 200μm decreased as the frequency increased.
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  • CO2 Laser Beam Drilling of Thin-Walled Spheroidal Graphite Cast Iron
    Yoshihiro Kataoka, Toshiyuki Miyazaki, Takateru Umeda
    1996 Volume 68 Issue 4 Pages 319-325
    Published: April 25, 1996
    Released on J-STAGE: February 01, 2011
    DOIhttps://doi.org/10.11279/jfes.68.319
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      CO2 laser beam was applied to the drilling of thin-walled spheroidal graphite cast iron. The average drilled diameter was investigated by changing the functions of laser power, irradiation time, gas pressure and the type of assist gases used. The smallest average drilled diameter obtained was 0.31mm under the conditions as the laser power of 400W, irradiation time of 0.5s, gas pressure of 0.5kPa and assist gas oxygen. A heat-affected zone was always generated. This heat-affected zone was then heat treated also with CO2 laser beam. The martensitic structure (800HV0.1) of the heat affecetd zone completely transformed into pearlite. A hardness of 300HV0.1 could be obtained under the conditions ; 700W, 0.5s, and 0.5kPa of assist gas oxygen. These results show that CO2 laser beam drilling and subsequent heat treatment should serve as a new drilling process of spheroidal graphite cast iron, which reduces physical labor and improves working conditions in foundry industries.
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  • Numerical Scheme of Flow Analysis with Non-Rectangular Mesh
    Takuya Sakuragi, Shinya Kashimura
    1996 Volume 68 Issue 4 Pages 326-331
    Published: April 25, 1996
    Released on J-STAGE: February 01, 2011
    DOIhttps://doi.org/10.11279/jfes.68.326
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      The numerical algorithm for solving the incompressible viscous flow with free surface is being expanded to the generalized curvilinear coordinate system. With this algorithm, the staggered square grid in a transformed space is used, and the Navier-Stokes equations are solved by using Newton-Rapson method, diagonal dominant technique, and VOF method to analyze the free surface of the liquid. The pressure and the contravariant velocities are corrected by the iteration method. As numerical examples, the oscillation of the water induced by the gravity in a U-type duct, and the flow pattern of the water filling a square cavity with some blocks are simulated. In comparison with the experimental data by image processing, the numerical result of the flow pattern in the cavity shows a good agreement qualitatively despite being a two dimensional calculation.
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  • FEM Analysis of Deformation of Moulding Flask at Casting for Optimum Reinforcement
    Kenichi Kanazawa, Kenji Chijiiwa
    1996 Volume 68 Issue 4 Pages 332-337
    Published: April 25, 1996
    Released on J-STAGE: February 01, 2011
    DOIhttps://doi.org/10.11279/jfes.68.332
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      Moulding flask is deformed by pressure of molten metal at casting, resulting in errors in the shape of the cast product. In this paper, three-dimensional deformation in six types of reinforcements (increase of frame thickness, crosspiece, edge bar, bottom plate, rib on frame, reinforcement of corner) for moulding flasks, is analyzed using FEM computer simulation. The maximum displacement of frame in each model under 0.098MPa pressure is measured, and stiffness per unit weight is investigated. The main results are as follows. (1) Every reinforcing method is effective. (2) The optimum reinforcing method for a netshape of castings, of eighteen calculated models, is that with triple cross pieces.
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