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32 巻, 8 号
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研究論文
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―アルミニウム合金鋳物の実体試験 その 1―森永 卓ー, 財満 鎮雄, 青野 幸雄1960 年 32 巻 8 号 p. 547-554
発行日: 1960/08/25
公開日: 2012/10/30
ジャーナル フリーIn casting, we are used to conjecture the mechanical property of the casting by measuring the strength, elongation and hardness of the specimen which was made from the test piece specially cast in a standard process. In machine designing data, the calculation is based on the mechanical property of the specimen, so, it is uncertain whether the property of every part in casting may differ from data for designing or not, and there seems to be not so much data obtained from the experiment in connection between the casting and the specimen. The authors made experiment on the aluminium alloy casting with the intention of obtaining the data for design or workshop. The radar housing case of 5% Mg hydrosodium (AC7A), which is used as the most oscillated and weather-beaten part in the ships and needs the mechanical strength, is divided into some parts and the mechanical property of every group is measured. That is, the tensile strength, the elongation, the Brinell hardness, the shearing strength and others are measured and the connection between the damping capacity (in the torsional oscillation) and the fatigue life (in the Shenk type torsional fatigue test) is searched. And the same experiments are made on specimens of which the test pieces are casted in according to JIS and Federal Standard (U.S.A.), and the comparison with the casting is made.
This study owed its expenses to the Scholarship Committee of the Institute of Light Metal Foundation to which we are extremely grateful.抄録全体を表示PDF形式でダウンロード (797K) -
雄谷 重夫, 本間 梅夫1960 年 32 巻 8 号 p. 554-560
発行日: 1960/08/25
公開日: 2012/10/30
ジャーナル フリーHarmful effects of contaminations of aluminium and silicon in 85-5-5-5 red brass are known only on the experiential basis, but little fundamental work is reported in this respect. In the present work the effects of aluminium and silicon are explained on the theoretical basis with the aid of mechanical test, macro-and micrography, radiography and thermal analysis.
Aluminium and silicon in the metals have different effects on the nature particularly on the mode of the solidification. Aluminium from 0.005 to 0.1% suspends in the molten metal in the form of alumina which disturbs mass-feeding into clearences of particular networks. This phenomenon causes formation of layer porosity which results in lowered tensile propeties and pressure tightness. If 0.3 to 1.0% of aluminium is added in the metal, however, the mode of solidification is similar rather of “skin-formation” type which ensures successfull feeding during solidification, setting off against the phenomenon above noted.
Silicon, in the rage of 0.005 to 1.0%, partially suspends in the molten metals in the form of silica or silicate, and partially dissolves in the liquid extending the range of freezing temperature, which causes more characteristic pasty solidification. These phenomena result in poor mass-feeding. The effect of silicon is rather destructive than of aluminium.抄録全体を表示PDF形式でダウンロード (2210K) -
―珪素の影響―久恒 中陽, 森 正平1960 年 32 巻 8 号 p. 561-570
発行日: 1960/08/25
公開日: 2012/10/30
ジャーナル フリーThe graphitization phenomena of malleable cast irons of the compositions; 2.4 percent carbon, 1.0∼3.0 percent silicon, 0.4 percent manganese and 0.02∼1.0 percent sulphur; were investigated and the following results were obtained;
1) Sulphur restrains powerfully the early graphitization but silicon accelerates the graphitization.
2) The temper carbon exists in the shape of spheroid within low silicon and high sulpher contents, but the shape of graphite changes into lump on star by increasing the silicon content.
3) When free FeS are present the spheroidal graphite precipitates.抄録全体を表示PDF形式でダウンロード (1310K) -
落合 三雄, 表野 明1960 年 32 巻 8 号 p. 570-575
発行日: 1960/08/25
公開日: 2012/10/30
ジャーナル フリーThe effects of libs which has various forms and of painting of metal Tellurium powder for the cracks, stated in the former report are given as follows:
1) The effect for the crack proves 100% when the libs and Tellurium powder painting are used.
2) The effect of Tellurium powder painting is 90∼100% for light parts (20kg>), but is 60∼70% for heavy parts (30kg<) when painted in some particular way.
Morever, the effectiveness of Tellurium painting and some other methods to prevent cracks are given.抄録全体を表示PDF形式でダウンロード (738K) -
藪内 清三, 竹田 実1960 年 32 巻 8 号 p. 575-579
発行日: 1960/08/25
公開日: 2012/10/30
ジャーナル フリーThe authors have investigated the collapse-ability of Tokitu Silica Sand combined with CO2 process on heating, especially the effects of temperature and grain size. Test pieces were heated up to 800 and 1300°C and air cooled.
After air cooling, test pieces were washed, screened and milled with laboratory sandmill. Heated grains were crushed by dead load.
The results obtained are summerized as follows.
1) The fine grains are more stable than the coarse grains on heating.
2) There are no remarkble differences between collapse amounts of CO2 process silica sands and bentonite sillica sands on heating at 800°C., But the former is smaller than the latter on heating 1300°C., especially in coarse sands.
3) There is irregularity in 65 mesh silica sand. This is due to the character of sand we have used.
4) The amounts of sintered sand on heating are greater than bentonite silica sands.
5) Heated sands have the tendency of brittleness and coarse grains crushed more easily than the fine ones by mechanical forces.抄録全体を表示PDF形式でダウンロード (607K) -
田辺 伊佐雄, 水牧 勝美, 増山 嘉男, 高瀬 昭三1960 年 32 巻 8 号 p. 580-585
発行日: 1960/08/25
公開日: 2012/10/30
ジャーナル フリーFor the determination of residual Ce, La and Ca in cast iron, the following methods were employed. Namely, colorimetry by oxine-chloroform for Ce, flame-metry for La and colorimetry by plasmocorinth for Ca. They were extended for the analysis of cast iron and accurate results was obtained.
1) Ce: Anhydrous Na2 SO4 was added to the extracted oxinate chloroform solution. After 30 min., stable color was obtained. Ca, Mg and Th did not interfere, but Mn effected when it's content exceeded 0.75%. The accuracy in analysis was within +0.001%∼−0.002%.
2) La: Addition of ethyl alcohol to the La containing solution enables more accurate results for it, by the excitation of flame emission. Mn, Ca, Ce, Th, Mg did not interfere. The error was within ±00.001%.
3. Ca: The method that does not collect Ca in precipitation but keeps in solution was examined. Above method assured ±0.001% accuracy. Mn, Cr, Ni, Mg, Ce, Th did not interfere.抄録全体を表示PDF形式でダウンロード (653K)
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