巻号一覧
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38 巻, 2 号
選択された号の論文の5件中1～5を表示しています
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研究論文
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篠田 忠夫1966 年 38 巻 2 号 p. 57-64
発行日: 1966/02/25
公開日: 2012/10/10
ジャーナル フリーIt is a fact that better casting yield is obtained by applying exothermic risers in comparison with the sand risers or others. But, it is necessary to clear the quantitative relationship between the size of riser and the thickness of exothermic sleeve on the solidification of molten meltal in exothermic riser and exothermic sleeve for the casting. So the author analysed the solifidication of molten steel in exothermic riser in this report. The obtained results were summarized as follows : (1) The applicable calculation on the solidification of molten steel in exothermic riser was obtained. (2) The quantitative relationships between the size of riser and the thickness of exothermic sleeve on the solidification time were gotten.抄録全体を表示PDF形式でダウンロード (747K) -
千々岩 健児, 郡 勇, 藤原 成彦1966 年 38 巻 2 号 p. 64-71
発行日: 1966/02/25
公開日: 2012/10/10
ジャーナル フリーThe residual stress of Cast iron with the θ type specimen was previously studied by K. Chijiiwa. In that investigation, it was noted that the residual stress which was occured by the resistance of shrinkage on the cooling time was mainly depend on the difference of the size of casting parts and mold resistance, and the pouring temperature had small influence on it. In the present investigation the effects of the composition and shape of steel castings and moreover the mold materials to the residual stress were studied by the same type specimen. The results obtained were as follows: (1) When the cooling rate of casting parts are remarkably different, the residual stress has increased. (2) Residual stress is generally proportional to the rate of casting shrinkage. (3) Residual stress of casting in CO2 mold is largerer than that in green sand mold or dry sand mold. (4) In case the cooling ratio of every casting parts are equal, the residual stress is the same with no relation to its size.抄録全体を表示PDF形式でダウンロード (733K) -
高柳 猛, 小坂 岑雄, 加藤 誠, 蓑輪 晋1966 年 38 巻 2 号 p. 71-77
発行日: 1966/02/25
公開日: 2012/10/10
ジャーナル フリーGenerally, Al2O3-SiO2 system refractories are corroded by molten aluminum which was chemically active even though the melting temperature is comparatively low. For example, a protective tube for thermocouple of porcelain and an insidewall of chamotte crucible used in experimental works are corroded by molten aluminum, and the corroded layer is changed its color to dark gray. Practically, the fact that iron crucible or graphite crucible used aluminum foundry production is depend the reason that these materials has higher corrosive resistance than Al2O3-SiO2 system refractories above described. There were many investigations on the reaction between molten aluminum and Al2O3-SiO2 system refractories. C. H. Schweinsberg, J. L. Dolph and K. J. Brondyke reported that the penetration of molten aluminum through the pore of refractory is proceeded the corrosion of refractory. By the affinity between the metal and oxygen on the thermodynamic consideration, J. G. Lindsay explained that the corrosion of refractories were proceeded by the containing of oxides which were reduced by molten aluminum. In this work, aluminum melted in the chamotte crucible and the thickness of the color changed layer was measured by comparator. The penetration of molten aluminum through the pore of refractory was recognized by X-ray diffraction method. The penetration was started by wetting which occured the reaction between the molten metal and refractory. However, the silicon nitride crucible was used and the penetration was not observed. Therefore the corrosion of refractory by molten metals was mainly caused by the penetration and the chemical reaction.抄録全体を表示PDF形式でダウンロード (782K) -
福本 勝, 鈴木 是明, 前川 静弥, 中川 義隆1966 年 38 巻 2 号 p. 77-87
発行日: 1966/02/25
公開日: 2012/10/10
ジャーナル フリーExperiments have been made on the sampling methods for oxygen analysis in molten iron saturated with carbon under carbon monoxide atmosphere. The results obtained were summarized as follows : (1) In the sample taking off nuggets solidified quickly by spraying neutral gas, completely quenched structure could not be otained, therefore it is not suitable for the method for oxygen analysis because of scattering oxygen content by the presence of graphite. (2) Of the sampling methods by suction, application of slender silice tube was favorable because it was free from influence of carbon monoxide and others. (3) Samples for oxygen analysis, especially in grey iron, depended on influence of atmosphere until they were analyzed. Consequently, it is necessary for the samples sucked by silica tube to be cooled very quickly as possible in the air, water and mercury of which the best results were expected in mercury.抄録全体を表示PDF形式でダウンロード (1541K) -
相沢 達志1966 年 38 巻 2 号 p. 87-95
発行日: 1966/02/25
公開日: 2012/10/10
ジャーナル フリーRecently, an atempt has been made to blow oxygen into molten iron, on producing pig iron or before spheroidizing treatment, in order to increase the elongation of spheroidal graphite cast iron as cast state. But is not sure to increase the elongation as cast state for all kinds of molten iron by this treatment. Then, the author studied influences of raw iron on the as cast structure and properties of the magnesium-treated spheroidal graphite cast iron blown with oxygen. The results obtained were summarized as follows : (1) Elongation as cast varied with the raw iron. (2) High elongation over 24% is ocasionally obtained as cast state. (3) When carburized pig iron or large amount of steel scrap are used as raw iron, elongation is low. (4) Results of micro-analysis show that steel scrap contains rather large amount of tin, which seems to lower the elongation. (5) When spheroidal graphite cast iron is made from iron sand pig, the oxygen blowing treatment removes titanium and vanadium, and improves spheroidization of graphite.抄録全体を表示PDF形式でダウンロード (1132K)
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