鋳物
Online ISSN : 2186-0335
Print ISSN : 0021-4396
ISSN-L : 0021-4396
66 巻, 12 号
選択された号の論文の12件中1~12を表示しています
研究論文
  • 北村 邦雄, 竹林 克浩, 安堂 優一, 吉田 千里
    1994 年 66 巻 12 号 p. 891-897
    発行日: 1994/12/25
    公開日: 2011/06/15
    ジャーナル フリー
      Semi-solid aluminum alloys were pressure-cast by a horizontal die casting machine and a vertical die casting machine. Soundness, structures, mechanical properties and dimensional accuracy of semi-solid products and die thermal load were investigated. Semi-solid metal up to 0.6 fraction solid is nealy able to fill the cavity of 1.5 mm thickness when semi-solid metal is cast at gate speed of over 30 m/s and casting pressure of over 100 MPa by a horizontal die casting machine. Semi-solid products made by a vertical die casting machine have a primary grain diameter of about 100 μm, less macrosegregation and less gas content. The tensile strength and elongation of the products are nearly the same as those of liquid metal products, while the reduction of macrosegregation, the reduction of die thermal load and the enhancement of dimensional accuracy, all of which are features of semi-solid metal, are ensured.
  • 坂本 勝美, 田代 政巳, 青山 俊三
    1994 年 66 巻 12 号 p. 898-903
    発行日: 1994/12/25
    公開日: 2011/06/15
    ジャーナル フリー
      In order to prevent scattered structure in ADC 12 alloy squeeze casting, insulating powder was electrostatically applied to the shot sleeve and the die cavity. As a result, it was found that while insulating powder has an excellent heat insulating performance during the filling process, it has heat transfer property as good as graphite or silicon oil series die lubricants, allowing the shots to rapidly solidify under a high pressure die casting condition. Also, scatterd structure and trapped air in the castings were significantly reduced and the mechanical properties of the casting was thus remarkably improved.
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