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30 巻, 10 号
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研究論文
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大島 勝己, 吉田 明, 佐々木 清和1958 年 30 巻 10 号 p. 779-785
発行日: 1958/10/25
公開日: 2012/11/01
ジャーナル フリーIn the previous report, the authors reported the sampling method of green sand. In this paper, we have established the new sampling method of dry sand according to the following process.
1) The size of increment and the accuracy of increment sampling against clay and moisture contents were figured out in the same manner as in green sand.
2) The number of increments was determined by taking into consideration the following factors; i. e. the properties of mulled sands at various places of a muller and those influenced by mulling time (Cost of sampling and analysis, and the necessary sampling weight for the estimation of sand properties.)
3) A survey was made on the estimation of the error variance of reduction and also on analysis, at the same time,抄録全体を表示PDF形式でダウンロード (677K) -
牟田口 元堂1958 年 30 巻 10 号 p. 786-792
発行日: 1958/10/25
公開日: 2012/11/01
ジャーナル フリーThis experiment was made on the relation between the permeability measured by a permeability test apparatus and the permeability of real sand mold. The gas pressure in the Sand mold cavity is determined by the relation between the rate of gas evolution from sand mold and its permeability.
The measurement of the evolving gas pressure on the state in which gases pass through the mold was made by means of “thermolab” and the self-made apparatus. On the measurement of gas pressure by the self-made apparatus, the author added a fixed amount of gas evolving matter to the sand which turns into gas at a comparatively low temperature.
By the results of this experiment, it was found out that the following relation existed between the gas pressure in mold cavity and the permeability of sand mold
at the compalatively low pressure: i. e.
pm∝h/F·a
but when pm beyonds a certain critical point
pm2∝h/F·a
where pm=maximum gas pressure in mold cavity
h=thickness of sand mold
F=permeability of sand mold
a=total sarface area of mold cavity
accordingly, the gas pressure in mold cavity changes greatly when the permeability becomes slightly small.抄録全体を表示PDF形式でダウンロード (666K) -
音谷 登平, 丸山 益輝, 徳永 洋一1958 年 30 巻 10 号 p. 792-798
発行日: 1958/10/25
公開日: 2012/11/01
ジャーナル フリーThe influences of various treatments, such as inoculation with ferrosilicon or calciumsilicide, vacuum melting, addition of Fe3O4, and magnesium treatment, on Mo-Cu cast iron were investigated. Cast irons containing 0.3 to 1.5%Mo and 0.05 to 2.3%Cu were remelted in an alumina crucible, using a Tamman furnace or a vacuum melting furnace. After various treatments at 1420°C, molten iron was poured into a dry sand mould with 20mm in dia, to investigate the structure and hardness.
The experimental results obtained are summarized as follows:−
1) It was comfirmed that inoculations showed a tendency to promote the formation of pearlite and to decrease acicular matrix in Mo-Cu cast iron studied. With higher contents of alloy elements, martensitic matrix increased by inoculations as the result of restraining bainite formation. Calciumsilicide showed more remarkable effect than that of ferrosilicon.
2) Vacuum melting or the addition of Fe3O4 produced a fine eutectic form of graphite in Mo-Cu cast iron and caused easily to form an acicular matrix. By vacuum melting, lower bainitic or martensitic matrix having high hardness appeared in higher alloy irons, which obtained almost acicular matrix in the case of Fe3O4 addition.
3) It is quite difficult to get an acicular matrix in Mo-Cu cast irons when spheroidal graphite is produced by magnesium treatment, unless the cast iron contains higher Mo with low Cu.抄録全体を表示PDF形式でダウンロード (967K) -
上田 俶完1958 年 30 巻 10 号 p. 799-803
発行日: 1958/10/25
公開日: 2012/11/01
ジャーナル フリーWhen white pig of malleable cast iron is preheated properly at 500∼600°C, the graphitizing periods of 1st and 2nd stages are reduced. This is palmer's Effect. At the same heating, Change of nitrogen existing state in iron is observed. namely, in nitrogen analysis, soluble nitrogen decreases and insoluble nitrogen increases.
The report of J. W. Dawson and others about nitrogen effect on graphite nodule and graphitizing period in malleable cast iron shows similar phenomena to this study.
Therefore, Palmer's Effect may result partially from the decrease of soluble nitrogen, namely the conversion from nitrogen in solid-solution to nitride.抄録全体を表示PDF形式でダウンロード (593K) -
（表面模様と鋳塊との関係）森永 卓一, 高橋 恒夫1958 年 30 巻 10 号 p. 803-810
発行日: 1958/10/25
公開日: 2012/11/01
ジャーナル フリーSeveral patterns appear on the surface when the rolled aluminium plate is anodic oxygenated, but these patterns have no influence on the mechanical and chemical properties of the plate. But, they are always disliked because the commercial value of the plate is much spoiled by them. The relation between the sort and the cause of the pattern is very complex and so it is not easy to discuss it generally. This relation seems to have a close connection with the primary structure of the slab. We therefore propose in this paper that there is a method of preventing the appearance of the patterns: that is, the part of the grain growth can be removed to both ends by improving the structure of the separator, and when the heavy worked plates are cladded previously, the appearance of patterns is prevented because the heavy working makes the pattern slight or disappear.抄録全体を表示PDF形式でダウンロード (1495K)
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