鋳物
Online ISSN : 2186-0335
Print ISSN : 0021-4396
ISSN-L : 0021-4396
32 巻, 1 号
選択された号の論文の6件中1~6を表示しています
研究論文
  • 原田 梅治, 西山 圭三
    1960 年 32 巻 1 号 p. 3-9
    発行日: 1960/01/25
    公開日: 2012/10/30
    ジャーナル フリー
      At their different grain sizes and sorts our investigation has been made on the penetration and fusion of four kinds of Foundry Silica Sand, Synthetic Silica Sand. Conical Silica Sand, Natural Silica Sand and Beach Sand in Tokai district which are used in great abundance now in the Foundry Industry of Japan.
      It has clarifyed by our investigation that each of these four kinds of Silica Sands has a remarkable property in the respect of the penetration and fusion according to its peculiar crystal structure, the difference of which is caused peculiar crystal structure, the difference of which is caused from its geological origin and manufacturing method.
      Our Conclusion is as follows:
      1. Foundry Silica Sands have their respective range of grain size where their burning changes from penetration to fusion, and this range is different according to the property of each sand, respectively.
      2. It can be said that Foundry silica sand has the lowest burning ability in this range of gram size.
      3. The critical range of Beach Sand exists in larger grain size, that of Synthetic Silica Sand at smaller grain size and those of Conical and Natural Silica Sands at medium grain size.
      4. With the larger grain size Natural Silica Sand shows the least burning property, Beach Sand 2nd, Conical Silica Sand 3rd, and Synthetic Silica Sand the biggest. With the smaller grain size Synthetic Silica Sand shows the least burning property, Conical Silica Sand 2nd, Natural Sand 3rd and Beach Sand the biggest.
      5. For the Combination and preparation of molding sand of larger grain size, is most suitable and Synthetic Silica Sand or Conical Silica Sand of small grain size most suitable.
  • 西原 初馬, 横山 昭夫
    1960 年 32 巻 1 号 p. 9-18
    発行日: 1960/01/25
    公開日: 2012/10/30
    ジャーナル フリー
      Various material svere added to molding sand to improve chemical properties, The Study is made on the effect of various material in sodium silicate molding sand, on the finess of molding sand, moisture in sodium silicate molding sand, on the fines of molding sand, moisture in sodium silicate, residual moisture, strength after heating at elevated temperature, and expansion at elevated temperature.
      The results obtained are as follows:
      1. Coal powder is used 1∼2%, and pitch powder is used 1∼3% to increase collapsibility of molding sand.
      2. Molasses seduces strength of molding sand on sodium silicate.
      3. Strength increases with of finess number.
      4. Residual moisture does not change with gassing time and atmospheric temperature.
      5. Strength due to preservation and drying is greater than gassing strength.
      6. Steangth of sodium silicate bending sand increases with increasing humidity and temperature.
      7. Hardening in accelerated by raising temperature and by adding water but the strength is decreased adding water in sodium silicate.
      8. Strength after heating at elevated temperature is maximum at the temperatures 100∼200 °C and at 1100 or at 900 °C also.
      9. Expansion at elevated temperature is maximum at 600∼650°C, and falls rapidly, and this temperature is not affected gassing time and volume of bording, And also this temperature rises with higher purity of molding sand and added materials.
  • 菊地 政郎
    1960 年 32 巻 1 号 p. 18-25
    発行日: 1960/01/25
    公開日: 2012/10/30
    ジャーナル フリー
      The separation of flake graphites in gray cast iron seems to be originated from insoluble nuclei suspended in molten iron, both in hypo-and hyper-eutectic ranges. Though insoluble nuclei SiO2 or some cilicates are concievable, but SiO2 is more probable.
      This idea has been confirmed by experiments. Flake graphites and pearlite in gray cast iron changed into eutectic graphites+ferrite by vacuum-melting, being super-cooled due to the loss of insoluble nuclei. Flake graphites and pearlite are regained by air-remelting of this vacuum-melted specimen, by obtaining insoluble nuclei again.
  • 足立 彰, 水川 清, 落合 一禧
    1960 年 32 巻 1 号 p. 25-31
    発行日: 1960/01/25
    公開日: 2012/10/30
    ジャーナル フリー
      The influence of gas content on the microstructure of various cast iron was studied.
      Fe-C alloy was melted in vacuum at 1300° and 1400°C. The fractures treated at 1300°C were gray and the microstructure showed eutectic graphite in pearlitic and ferritic matrix. On the other hand, the fractures treateted at 1400°C were white and microstructure showed primary austenite in ledebritic matrix. When nitrogen was blown into electric iron, its nitrogen content increased while oxygen content decreased, and then the shape of graphite changed into thick and curved from coarse flaky.
      K4Fe (CN)6 was added to cupola iron. Nitrogen content increased and flaky graphite was changed into thick and curved. In the cast iron treated with nitrogen before addition of K4Fe (CN)6, graphite was changed into short and thin with the amount of addition.
  • 岡林 邦夫
    1960 年 32 巻 1 号 p. 31-40
    発行日: 1960/01/25
    公開日: 2012/10/30
    ジャーナル フリー
      On the reactiveness caused by magnesium addition into molten pig iron, theoretical foundations are given to the experimental results by means of thermodynamic calculation in this paper.
      Concerning the effect of the temperature of magnesium addition and those of magnesium content in the representative magnesium nodulizing alloys to the recovery of magnesium in cast iron, the decrease in vapor pressure and the rise in boiling point of copper magnesium, nickel-magnesium and silicon-magnesium alloys were calculated by means of the law of Raoult.
      Furthermore, the effect of deoxidation and desulphurization as the chemical reactions caused by magnesium treatment were clarified experimentally, and then considered theoretically by means of the calculation of free energy of reactions.
      It is confirmed from this investigation that it is necessary to retain a certain amount of residual magnesium greater than a critical value in order to nodulizing graphite in magnesium treated cast iron.
  • 鹿島 次郎, 村木 庸益, 山崎 卓雄
    1960 年 32 巻 1 号 p. 40-44
    発行日: 1960/01/25
    公開日: 2012/10/30
    ジャーナル フリー
      Hydrogen content of molten aluminium was determined by the gas chromatographic method. Evolution rate of hydrogen which was drived from the molten aluminium by bubbling nitrogen was recorded with elapsed time, and the total hydrogen content was measured from the chromatogram.
      Compared the chromatographic determination with density measurement on the same melt, and this method is confirmed to be credible enough.
      The operation is much easier when the flow rate of nitrogen bubbling is in the range of 40∼120 c.c./mn. The time for degassing and the flow rate of nitrogen bubbling show a linear relation independently from the content of dissolved hydrogen, in the above range of nitrogen bubbling flow rate. So that the time degassing seems only to be concerned to the bubbling flow rate of nitrogen.
feedback
Top