鋳物

研究論文

含銅クローム鑄鉄の製造に關する硏究

前川靜彌, 山下健

1951 年 23 巻 4 号 p. 1-9
発行日: 1951/04/25
公開日: 2012/11/22

DOIhttps://doi.org/10.11279/imono.23.4_1

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  Generally Ni or Cr is used to improve the mechanical properties-especially the property of resisting wear- of cast iron products.
  We performed a few experiments on the cast irons of Cu and Cu-Cr which have the nearlly same properties to that of a cast iron with Ni, because the supply of Ni is decreased recently and also we must cut down the production cost. The results of the experiments are as follows:
  (1) The graphitization of Cu is weaker than that of Ni.
  (2) There is no segregation of Cu up to about 2%.
  (3) Copper reduces its fluidity, but there is no great influence at the casting temperature about 1350°C.
  (4) The mechanical properties of them are equal to that of Ni-Crcast iron.
  (5) Like a Ni-Cr cast iron, the micro-structure of a Cu-Cr cast iron makes its pearlite fine.
  We used them for a dryer-gear in conformity with these actual results. The results of them are as follows.
  (1) As for a mould or a design, they are as good as a Ni-Cr cast iron.
  (2) The blow hole does not arise in products and the castability is good.
  (3) The machinability is good.

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中子の高周波乾燥に關する研究（第1報）

千々岩健兒

1951 年 23 巻 4 号 p. 10-13
発行日: 1951/04/25
公開日: 2012/11/22

DOIhttps://doi.org/10.11279/imono.23.4_10

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  Excellent results are secured in drying of foundry sand cores binded by synthetic resin binder by the use of the high frequency electronic core baking equipment.
Among the advantages of this method, are :
  (1) Exceedingly rapid baking.   (2) Uniform and complete baking and no overbaking.
  (3) Better physical properties of sand cores.   (4) Oven need not be kept hot when not in use.

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靑銅鑄物の熱處理に就いて

鈴木松夫

1951 年 23 巻 4 号 p. 13-17
発行日: 1951/04/25
公開日: 2012/11/22

DOIhttps://doi.org/10.11279/imono.23.4_13

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  The effect of the heat treatment for the cast bronze was tested. The results of this experiment may be summerised as follows :
  (1) In exceptional cases, the cast bronze has a bad hydraulic test caused by including both shrinkage holes and cavities resulted from the dendritic structure especially in the tin bronze. An annealing at the temperature about 700°C improves this dendritic structure and gives us a sound casting with a good hydraulic test.
  (2) Better qualities of bronze castings were obtained by utilizing this type of annealing, whilst it is the general opinion that the too low pouring temperature causes bad qualities of bronze castings.
  (3) Corrosion resistant properties were also improved.

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生砂型の强度測定法に關する一考察

鹿島次郎

1951 年 23 巻 4 号 p. 17-21
発行日: 1951/04/25
公開日: 2012/11/22

DOIhttps://doi.org/10.11279/imono.23.4_17

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  As an instrument to measure the binding strength of a mould，"Dow' s Penetrometer" was used. This instrument is the one to measure the viscosity of Asphalt.
  This experiment utilizes character that the needle installed in this instrument drops into green sand mould to a certain depth according to its binding strength.
  It has been found out through this experiment that a more precise measurement could be done than the A. F. A. mould hardness tester heretofore in use.

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