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26 巻, 4 号
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研究論文
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牛山 五介, 喜多 新男, 鹿取 一男, 田中 龍男1954 年 26 巻 4 号 p. 179-186
発行日: 1954/04/25
公開日: 2012/11/14
ジャーナル フリーThe authors attempted experimental heats in the I-ton Héroult electric arc furnace with basic lining. The results are summarized as follows : (1) In basic heats, the amounts of O2 and non-metalic inclusion decrease in proportion as a holding time of carbide slag is lengthened and are 0.001 to 0.003% less than those in acid heats. The differences of these contents do not increase by prolonging the holding time of carbide slag. The above seems to show the limit of refining by the carbide in basic heats. (2) Compared with acid heats, on the other hand, the defects coming from an increase of N2 and H2 contents with a decrease of O2 partial pressuse in basic heats can be supposed. Virtually, N2 contents are 0.002 to 0.007% higher than those in acid heats. The increase of the rate of graphitization in the second stage seems to be due to the increase of N2 contents. (3) H2 contents fluctuate 0.00002 to 0.00010% and their values are unchangeable by means of oring with mill scale. Moreover, in gases evolved on solidification of molten iron, H2 is seldom or never detected. (4) The increase of mottling tendency in basic heats is able to be defended by adding sulpher. (5) The size and distribution of graphite have not a great difference between basic and acid heats, but in the former non-metallic inclusions are exceptionally less than those in the latter. After all, the purpose of refining white cast iron was accomplished by holding carbide slag in the basic lined electric arc furnace. The authors, in future, will study how a small quantity of H2 effects on defects, the relationship between O2 and N2 contents, etc.抄録全体を表示PDF形式でダウンロード (930K) -
—絞られの實驗—西山 太喜夫, 南鄕 忠勇, 片桐 稔1954 年 26 巻 4 号 p. 186-194
発行日: 1954/04/25
公開日: 2012/11/14
ジャーナル フリーAuthors investigated the relation between properties of moulding sand and buckles, which are defects occuring in an iron casting by a green mould. Results obtained are as follows : (1) Buckles have not direct relations to the absolute values of sand properties, i.e., the strength, permeability, water content and others. (2) The strength and permeability, which were variable when a kind of sand used changed the water content, have a relaion to buckles. Permeability showed a remarkable one. (3) The water content to produce the maximum permeability of sand can be calculated as the following equation ; (Water content to produce the max. permeability) = (Coefficient) × (Min. water content to make clay sticky) × (Amount of clay) (M. I.)抄録全体を表示PDF形式でダウンロード (955K) -
鹿島 次郞, 鈴木 弘茂1954 年 26 巻 4 号 p. 194-200
発行日: 1954/04/25
公開日: 2012/11/14
ジャーナル フリーPhenolic resins are commonly used in the practical field as the organic binders for shell molding because of their exccellent properties. But in our country, the cost of phenolic resins is much expensive compared with that of Europe and America. It impedes industrialization very much. The study has been carried out in order to find out the substitute for phenolic resins and urea resins. Rosins and cyclic rubber derivatives were used this time. Urea resin, in general, is comparatively poor in its flow character at heating and requires moisture for condensation. Dimethylol urea, a monomer of the ordinary urea resin, had worse flow character, therefore it could not be used as the binder for shell molding. Contrary to this, the very satisfying result could be obtained with methylated dimethylol urea having a low melting point and good flow character. Both rosins and cyclic rubber derivatives are the thermoplastic resins, but they could be used for this process when they were co-polymerized with phenolic resins and were converted into thermosetting resins. In the case that rosins were used up to the mixing ratio of 1 : 1, relatively good results could be derived. However, the strength of the mold made of cyclic rubber derivatives was inferior. The co-polymer of urea resins and phenolic resins could be applied to this process in every constituent.抄録全体を表示PDF形式でダウンロード (774K) -
鹿島 次郞, 森 繁1954 年 26 巻 4 号 p. 200-204
発行日: 1954/04/25
公開日: 2012/11/14
ジャーナル フリーThe relation between water percent contained in clay and the volume of clay has been studied this time. By this study, it was understood that two factors, i. e., free water and its volume, were in the linear function in common clays. The measuring method of free water contained in clay at its plastic limit has also been studied and the following formula was derived : Percentage of the contraction of clay contained in sand mold (in desiccator) = (α/1+α)k−α⋅⋅⋅⋅⋅⋅⋅⋅⋅(1) where a=water percent in sand/clay percent in sand α=constant peculiar to clay K=general constant. In these factors, a is the amount of mixed water which the compression strength of the green sand becomes the maximum and it is nearly 2F. (F is the amount of free water at the plastic limit of clay) According to the several results, the value α is equal to 8 in every clay. Also the value of K was taken as nearly as 2/3 from many experimental values.
Therefore, the formula (1) can be converted into as follows :
Percentage of the contraction of clay contained in sand mold {(2F/1+2F)}(2/3)−8⋅⋅⋅⋅⋅⋅⋅⋅⋅(2)抄録全体を表示PDF形式でダウンロード (674K)
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