鋳物

研究論文

鑄鐵の黑鉛化について（第3報）

— 純鐵−炭素合金の黑鉛化に對する第3元素の影響 —

五十嵐勇, 芹田陽

1953 年 25 巻 9 号 p. 429-434
発行日: 1953/09/25
公開日: 2012/11/16

DOIhttps://doi.org/10.11279/imono.25.9_429

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  The present writers made specimens by chill casting added Si, Mn and Cr as 3rd elements to Fe-C alloys, and tempered them at 900°C, 1000°C and 1100°C respectively and examined the growing process of graphite by the microscope.
  According to these experiments occurrences of all graphite particles were at the boundary austenite and peaky cementite, and then they grew both in austenite and cementite regions as Si was added, but the growth was only toward austenite region as Mn or Cr was added.
  Much tempering time was required before graphite occurs, but when graphite particles was produced, graphitization will swiftly advance.

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Cr−Mo 鑄鋼の白點狀缺陷について

木下禾大

1953 年 25 巻 9 号 p. 435-443
発行日: 1953/09/25
公開日: 2012/11/16

DOIhttps://doi.org/10.11279/imono.25.9_435

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  Recently a high pressure and temperature have been used for land and marine turbines. Accordingly Cr-Mo steel castings are used for the turbine castings and their attachments. But cracks that differ from hot tear are often seen in these castings.
  These cracks are resemble with white spot or hair cracks which occur in the special steel, forgings by their characteristics, that is, their sharp from, aging Phenomenon, and which were affected by the cooling velocity or stress.
  Cracks which happen in the test piece that is forged and water cooled by 800°C, resemble with the cracks of castings.
  The cause of these cracks are not clear, but if these cracks are same as white spot, alloy steel castings, especially in large and complex form with high alloy elements, are very dangerous, so that mamufacturing of these castings must be done most cautiously.

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合成砂の硏究（その一）

—鑄物砂の粒度と諸性質との關係—

谷村凞

1953 年 25 巻 9 号 p. 444-452
発行日: 1953/09/25
公開日: 2012/11/16

DOIhttps://doi.org/10.11279/imono.25.9_444

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  Sand grains of uniform size were sieved out of natural and crushed quarz sand.
  Series of synthetic sand were prepared by mixing the sand grain and a fixed amount of binder, Kibushi-clay, in which the water content was varied. Permeability and strength of sand were examined and the following results were obtained. Some considerations were given on the results.
  The maximum permeability of sand is given by the formula P=kdⁿ, where d is the average diameter of sand grain. n is the index, whose numerical valve lies between 1.4∼1.7, according to the kind of sand.
  With a fixed amount of binding meterial, strength of sand is higher with coarse grain size. On the other hand, when grain size becomes finer than 100 mesh, the strength of sand has a higher value. This phenomena are explained by two factors of sand strength, binding power of clay and contact resistance of sand grain.
  Strength of sand with coarse grain varies rapidly with water content, and in such sand, care must be teken to control the moisture in the practice.

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鑄型の乾燥について（其の三）

— 赤外線による表面乾燥 —

千々岩健児

1953 年 25 巻 9 号 p. 453-459
発行日: 1953/09/25
公開日: 2012/11/16

DOIhttps://doi.org/10.11279/imono.25.9_453

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  To know the advantages and disadvantages of mould surface drying by ultrared lamp, the following experiments were carried out.
  (1) The effect of drying time, mould lamp distance and numbers of lamps.
  (2) Temperature distribution.
  (3) Drying process.
  (4) Moisture returning.
  (5) Drying of blocking surface.
  Drying process is as same as gas drying, and it is a good method in surface drying, but in practice we must take care of the lamp distance and lamp arrangement.

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