鋳物

研究論文

金型中のエア・ギャップの形成と塗型剤による影響について

大平五郎, 小林俊雄, 大出卓

1966 年 38 巻 1 号 p. 4-11
発行日: 1966/01/25
公開日: 2012/10/10

DOIhttps://doi.org/10.11279/imono.38.1_4

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  The investigation was carried out to understand the process of air gap formation. The temperature on the surface of the mould and the displacement of casting and mould surface were measured continuously with pure aluminium poured into a various thickness cast iron mould. Then the effect of mould dressing was investigated and discussed. Results obtained were as follows: —
  (1) By increasing the mould thickness, the temperatures attained at the surface of the mould are different and the time of solidification is affected by the mould thickness as well as by the mould dressing.
  (2) A sharp change was observed in the temperature of the inner surface of mould due to the air gap formation.
  (3) It was found experimentally that the formation of air gap increased the solidification time of the castings.
  (4) It was assumed that the maximum heat transfer rate, which corresponded to the time of maximum temperature, coincided with the air gap formation between the casting and the mould, and heat transfer rate was affected by mould dressing.
  (5) When the molten metal was poured into a metallic mould, this expanded outwardly by heat absorption forming solid skin at contact surface for a certain period, and after the solid skinstiffened to resist the static pressure of the metal, solid contraction occurred; consequently air gap was formed in cooperated with the expanding mould.

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鋳鉄中の酸素含有量と黒鉛球状化との関係について

真鍋健太郎, 喜多章

1966 年 38 巻 1 号 p. 11-16
発行日: 1966/01/25
公開日: 2012/10/10

DOIhttps://doi.org/10.11279/imono.38.1_11

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  In the previous report, authors mentioned that the oxygen content in cast iron slightly increased by adding yittrium as nodulant, neverthless, the spheroidal graphite cast iron were obtained.
  This phenomena can’t be explained by spheroidizing theories reported so far by other investigators. So, the authors investigated the oxygen content and the graphite microstructure in cast irons melted in an electric furnace which generally contains less amount of oxygen and also did the same in cast irons melted in cupola which generally contains more amount of oxygen treated with Ce, Y or Mg.
  The results obtained were as follows; In molten cast iron containing a limited oxygen content.
  (1) The addition of graphite spheroidizing elements does not always give a strong deoxydizing phenomena.
  (2) The oxygen content of some flaky graphite cast irons was less than that of some spheroidal graphite cast iron.

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溶融鋳鉄の水素量に及ぼすマグネシウムの影響

加藤栄一

1966 年 38 巻 1 号 p. 16-24
発行日: 1966/01/25
公開日: 2012/10/10

DOIhttps://doi.org/10.11279/imono.38.1_16

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  The effect of magnesium on the hydrogen content of molten cast iron melted in a Tammann furnace has been studied. The results obtained were as followings;
  (1) When cast iron is melted in air, the addition of Ni-Mg alloy to the melt has no effect on the hydrogen content, and the hydrogen content is reduced by addition of Fe-Si-Mg alloy.
  (2) When cast iron is melted in hydrogen atomosphere, the addition of Ni-Mg alloy increases the hydrogen content, and it is reduced by Fe-Si-Mg alloy addition. As it has been reported that nickel has no effect on the solubility of hydrogen in molten iron and that silicon remarkably decreases the solubility, it may be concluded that magnesium increases the solubility of hydrogen in the melt.
  (3) When cast iron is melted in steam, the hydrogen content increases rapidly by the addition of Fe-Si-Mg alloy or Ni-Mg alloy, and also the hydrogen content increases very rapidly when steam was blown over the surface of the melt after the addition of Fe-Si-Mg alloy. A thermodynamical consideration shows that magnesium vapor reduces steam to hydrogen, which would rapidly enters into the melt, and also it is shown that magnesium in the melt is a far more powerful deoxidizer than carbon or silicon.
  (4) The addition of magnesium oxide to the surface of the melt does not effect on the hydrogen content of the melt when it is melted in air, the hydrogen content, however, decreases after a slight increase when the addition is performed in steam.

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鋳鉄の酸素分析用試料採取法に関する研究

鈴木是明, 前川静弥, 中川義隆

1966 年 38 巻 1 号 p. 25-32
発行日: 1966/01/25
公開日: 2012/10/10

DOIhttps://doi.org/10.11279/imono.38.1_25

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  In order to get exact oxygen content in cast iron, experiments have made on the method of sampling for oxygen analysis under two conditions of the melts with different chemical compositions and melting atmospheres. The results obtained were summarized as follows:
  (1) Any white iron sample showed low oxygen content without scattering.
  (2) Oxygen content of grey iron samples were higher than that of white iron and had great scattering.
  (3) Applying the sampling of vacuum method, its oxygen content were almost the same as that of white iron although it solidified grey.
  (4) The distribuion of oxygen content in the chill block was that the portion of clear chill showed low oxygen content, and that of grey iron highr oxygen content with scattering.
  (5) In case of changing melting conditions, lower oxygen content were obtained in both meltings with Argon atmosphere and with long time.

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