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48 巻, 5 号
選択された号の論文の6件中1～6を表示しています
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研究論文
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房村 信雄, 名古屋 俊士, 雄谷 重夫, 高田 孝保, 古田 繁夫, 藤井 孝彦1976 年 48 巻 5 号 p. 267-272
発行日: 1976/05/25
公開日: 2012/09/13
ジャーナル フリーDevelopment of a method for sampling and analyzing metallic fume emitted from molten copper-base alloys is awaited since it is important in terms of controlling atmospheric pollution. An apparatus having modified heat resistant devices was developed for extracting metallic fume at elevated operating temperatures and was applied to determine the composition and quantity of metallic fume emitted during commercial melting of Cu-Pb alloys. The quantity of Pb fume from molten alloy is : C=1.59×10-2×1.03exp (5×10-3t) where, C is the quantity of Pb fume (μg/min), X is weight percent of Pb in Cu-Pb alloy and t is temperature of molten alloy (°C). The quantity of metallic fume emitted from molten alloy is in proportion to the temperature and the content of Pb in the alloy.抄録全体を表示PDF形式でダウンロード (699K) -
高瀬 誠次, 押田 良機1976 年 48 巻 5 号 p. 273-279
発行日: 1976/05/25
公開日: 2012/09/13
ジャーナル フリーSolid-state bonding of cast irons applying superplastic phenomena was demonstrated and the joints were investigated. Also in the present study, the amount of up-set due to superplastic flow during bonding period has been investigated in detail and it has been clarified that the control of the above mentioned up-setting is one of the most essential factors in the present bonding technique. The tensile strengths and fatigue limits of joints in FC25 and FCD45 show satisfactory data in comparison with those in base metals.抄録全体を表示PDF形式でダウンロード (845K) -
鈴木 是明, 中田 進一1976 年 48 巻 5 号 p. 280-286
発行日: 1976/05/25
公開日: 2012/09/13
ジャーナル フリーFactors affecting metal penetration into sand mold have been investigated on an experimental scale by an apparatus developed by the authors which is capable of simulating actual conditions in heavy section steel casting. Preheated sand molds were immersed in molten steel melted by high frequency induction furnace in a pressure vessel and gas pressure was applied to the upper surface of molten steel in order to make the molten steel penetrate into sand mold. It is shown that the higher the temperature of molten steel, the larger the depth of penetrated layer is, and metal penetration does not occur at the liquidus temperature of molten steel. The depth of the penetrated layer increases with increasing gas pressure and holding time. The resistance against metal penetration of cold-setting sand mold is worse than that of dry sand mold, and chromite sand has better resistance against metal penetration than silica sand. Zircon wash used has little effect on preventing metal penetration into sand mold.抄録全体を表示PDF形式でダウンロード (811K) -
小松 康彦, 岡田 恭夫, 升田 隆一1976 年 48 巻 5 号 p. 287-292
発行日: 1976/05/25
公開日: 2012/09/13
ジャーナル フリーFor the development of exhaust gas purifying devices of automobiles, the development of cast products with excellent heat characteristics in terms of anti-heat cracking and anti-oxidation properties is urgent. In this study, the possibility of heat insulating casting was considered and metal-ceramic composite material which is produced by pouring molten metal outside the ceramic pipe placed in advance in a mold was examined as a typical example. Ceramic pipes having 50mm outside diameter with four different materials were placed in molds afterwhich aluminum alloy or gray cast iron was poured. All of the alumina group ceramic pipes broke at the time of pouring due to thermal shock. All of the mixed alumina-silica group cracked. Some of silica group broke and others cracked. By contrast, the special group containing alumina cement was enveloped soundly without any cracks irrespective of the kind of metal. This is due to the reason that the special ceramic containing alumina cement has low modulus of elasticity and optimum range of compressive strength, that is, it has high flexibility, and therefore the diameter of the ceramic pipe can be reduced close to the elastic limit due to the force of contraction of the cast metal, as a result of which excess stress is released by the elastic deformation of the ceramic to give a sound composite structured pipe. The surface of the metal has shrunk to fit that of the ceramic due to contraction of the metal poured. Since the compressive stress in the ceramic is balanced with the tensile stress in the metal within the range of elasticity, the metal-ceramic composite structure can withstand mechanical vibration with sufficient durability so that uses in internal combusion engines and other uses can be expected.抄録全体を表示PDF形式でダウンロード (815K) -
藤巻 弘昭, 佐伯 啓治, 高橋 大輔1976 年 48 巻 5 号 p. 293-298
発行日: 1976/05/25
公開日: 2012/09/13
ジャーナル フリーIt is very difficult to produce heavy section cast steel without any defect, but defects may become the starting point of brittle fracture. In this paper, initiation characteristics of brittle fracture were investigated using “Three Point Bending” type COD Test to ascertain safety of cast steels. Bending COD Test is effective as a small size KC test and good coincidence is found between the results of Bending COD Tests and Deep Notch Tests. Critical COD and KC values were measured at the center of cast steel of 400mm thickness and the relation between applied stress and defect size to prevent brittle fracture was elucidated.抄録全体を表示PDF形式でダウンロード (667K) -
西田 義則, 磯谷 三男, 松原 弘美1976 年 48 巻 5 号 p. 299-305
発行日: 1976/05/25
公開日: 2012/09/13
ジャーナル フリーPure aluminum as fiat casting was poured into metal molds, and the thermal resistance at the casting-mold interface was analyzed by using finite difference methods of one-dimentional heat conduction equation. Thermal resistance decreases drastically from the initial large value until it settles down on a value, and does not seem to change noticeably until the end of freezing. Thermal resistance does not depend upon the surface temperature of mold, mold thickness, or thickness of casting in this experiment. The thermal resistance of graphite coating is comparatively small, about 10-20cm2·sec·°C/cal, but those of alumina coating and diatomaceous earth coating were about 30-40 and about 70cm2. sec·°C/cal respectively. Thermal resistance depends upon the fineness of molddressing materials, namely, roughness of the surface of coating. If the material of mold dressing is fine enough, the thermal resistance depends mainly upon the thickness of coating.抄録全体を表示PDF形式でダウンロード (712K)
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