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30 巻, 7 号
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研究論文
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千々岩 健児1958 年 30 巻 7 号 p. 531-535
発行日: 1958/07/25
公開日: 2012/11/01
ジャーナル フリーThe casting stresses of ordinally, innoculated and spheroidal cast irons were compared with using the same shape of specimens as θ, and it was found out that the casting stress increases in the order mentioned above.
And also, the relation between the ratios of ring, arm and boss in size and the casting stress of the specimen was investigated putting a boss in the center arm of the Θ shape specimen. It was found that the casting stress becomes almost neglible when V/S ratios of ring and boss are equal. (V : Volume, S : Surface area)
This is true without respect to the kind of material.抄録全体を表示PDF形式でダウンロード (537K) -
大島 勝巳, 吉田 明, 佐々木 清和1958 年 30 巻 7 号 p. 536-541
発行日: 1958/07/25
公開日: 2012/11/01
ジャーナル フリーThe sampling of bulk materials such as molding sands is very difficult, so there has scarecely been established any statisfactory sampling method up to this time.
In this paper, we have corrected the unreasonableness of the conventional sampling method and established the new rationalized sampling method of green sand according to the process listed below.
1. By means of increment sampling and its variant analysis, the size of increment and the sampling accuracy against the moisture content were determined.
2. Considering the sampling accuracy and weight required to estimate sand properties for the molding practice, a number of increments is determined by the variant analysis.
As the result of the new sampling method adaptation, casting defects due to green sand have considerably decreased.抄録全体を表示PDF形式でダウンロード (624K) -
牟田口 元堂1958 年 30 巻 7 号 p. 541-547
発行日: 1958/07/25
公開日: 2012/11/01
ジャーナル フリーThe reason why the molten metal does not penetrate into the openings of sand grains is because of its great surface tension.
Thus, the author thinks that the penetration or blow as the casting defects seems to be related to the surface tension of molten metal, so that the critical limit of penetration or blow and the relation between penetration and washes of sand molds were investigated by using mercury, which surface tension and density are similar to those of molten metal, in this report.
From the results of the experiment, (1) the pressure which causes the penetration is inversely proportional to the size of the mold opening (2) the penetrating pressure increases when the back pressure exists (3) when the back pressure beyonds its critical range, the blow occurs regardless of the state of mold surface.抄録全体を表示PDF形式でダウンロード (685K) -
森永 卓ー, 高橋 恒夫, 大森 梧郎, 大場 宏1958 年 30 巻 7 号 p. 548-553
発行日: 1958/07/25
公開日: 2012/11/01
ジャーナル フリーThe influences of Fe-composition upon the anti-corrosion property of the hydronalium products by die casting are studied with using 3%NaCl solution. In die casting, if the material does not contain any amount of Fe-composition, the casting operations cannot proceed smoothly because of bad stripping.
In general, less than 0.4% Fe-composition is permitted against 8∼10%Mg content in aluminium alloy for casting, but, in aluminium alloy for die casting, as specified by JIS, the allowance limit of Fe-composition is relieved largely, for example, Fe is less than 1.8% for Grade 5. containing 4∼11%Mg, and less than 0.8%Fe for Grade 6, containing 2.5∼4%Mg. Originally. hydronalium has a good anti-corrosion property, and we study whether this property is affected largely by increasing of Fe-content.
The results are summarized as follows:
(1) The anti-corrosion property is not affected by 1.3∼1.8% Fe-contents in the case of 8%Mg.
(2) The anti-corrosion property is not affected by 0.7∼0.9% Fe-contents in the case of 2.5%Mg.
And there seems no good influence on the anti-corrosion property with the addition of Fe-composition which is beyond or below the above ranges.抄録全体を表示PDF形式でダウンロード (727K) -
菊地 政郎1958 年 30 巻 7 号 p. 553-559
発行日: 1958/07/25
公開日: 2012/11/01
ジャーナル フリーThe author has intended to clarify the effects of very small amounts of gaseous elements or non-metallic inclusions contained in raw pig iron. In order to eliminate these gaseous elements or inclusions from molten iron, a vacuum-melting procedure was chosen in this experiment.
At the beginning of this research, the experiments reported in this paper were made to clarify the relation between vacuum-melting of cast iron and it's mechanical properties.
Charcoal, blast furnace and synthetic pig irons (Fe-C-Si Alloy) were chosen as the ram materials. For vacuum melting, mullite and graphite crucibles were used:
And the results obtained are summarized as follows: In case of mullite crucibles used:
1) When charcoal, blast furnace and synthetic pig irons are vacuum-melted, flake graphite existing in each raw pig iron changes into fine eutectic graphites, at the same time, the pearlitic matrix changes into ferritic.
2) Tensile strength of cast iron, in general, is, immproved by vacuum-melting, but in some cases, being contrary to this, decreased. The author thinks, that more experiments must be done on this change in strength.
3) In many cases, a reticulate (graphite+pearlite) structure was observed in the specimens of vacuum-melted charcoal and blast furnace pig irons.
4) It is assumed that super cooling is induced by vacuum-melting of pig iron.
In case of graphite crucibles used:
5) When charcoal, blast furnace and synthetic pig iron are vacuum-melted using graphite crucibles, carbon percentage of molten pig iron increases remarkably, as the results, tensile strength decreases greatly accompanying with the precipitation of coarse flaky graphite in the microstructure.抄録全体を表示PDF形式でダウンロード (1063K)
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