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28 巻, 7 号
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研究論文
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田中 武1956 年 28 巻 7 号 p. 467-476
発行日: 1956/07/25
公開日: 2012/11/09
ジャーナル フリーThough several studies have been reported about the cupola operation, the author will announce the result of the cupola operation which was carried out under controlling CO2 in the effluent gases.
From the result of studies for improving the properties of iron castings, he has found that the CO rich-control process for cupola melting is more effective to produce good castings than the conventional process.
The results of investigation were as follows :
1. CO2/CO ratio in the effluent gases during cupola operation should be maintained as 1 : 2.
2. The details of controlling the combustion ratio in the effluent gases shall be announced in this article.
3. The influences of carbonization and slag, and the particular phenomena of the surface of molten metal are also investigated.
4. Better mechanical properties can be obtained by this method than those by conventional melting process.
5. Decreasing of gases to be absorbed by the cast iron and sound castings will be secured by this melting process.抄録全体を表示PDF形式でダウンロード (1129K) -
—キュポラの構造について—阿部 喜佐男, 齋藤 親徳, 高市 典明, 松村 英一1956 年 28 巻 7 号 p. 477-486
発行日: 1956/07/25
公開日: 2012/11/09
ジャーナル フリーIn order to produce high grade cast iron, it is important to consider about the cupola constructions.
We constructed an experimental cupola of 480 mm diametre, in which the blast volume can be controlled automatically, and which is set the CO2 meter. Then we studied the effect of cupola construction on the operation. Several results obtained are as follows : —
1. When the effective height ratio and the tuyère ratio are increased, the blast pressure increases in general. But when the effective height ratio is 3∼5 and the blast volume is small, the blast pressure does not show remarkable increase.
2. The blast pressure at the section of the furnace is measured in the non-burning condition and the gases in this condition are analyzed, then a great amount of blast, which flows along the cupola wall, was detected.
3. The construction of this cupola gives a good effect on the equi-blast operation. Therefore, to enlarge the wind box, to increase the number of tuyère and to make uniform the size of charging materials are the effective method.
4. If cupola construction and operating condition do not meet to the blower effeciency, good melting operation can never be expected.
5. It is found that there is a close relation between coke ratio and CO2 gas per cent. This result is in accordance with the blast volume theoretically.抄録全体を表示PDF形式でダウンロード (1046K) -
—寒川合成砂の搗固め変形，硬度および流動性—藤本 留吉1956 年 28 巻 7 号 p. 486-498
発行日: 1956/07/25
公開日: 2012/11/09
ジャーナル フリーIn reports II and III, permeability, base of grain size distribution and green strength of this sort of synthetic sands have been studied and discussed.
The variations of the specimen heights and the change of green hardness of the sand by ramming are studied referring to moldability, stability and flowability. As to flowability, not only the variation in green state but also in dry state are investigated. Moreover, the influences of the moisture per cent and the addition of bentonite on the properties of the sand are also explained.
Especially, the changes in volume and in hardness by the degrees of ramming are measured by using four types of the sands and from the results of the comparison, No. III and No. IV sands are excellent among four in its properties.
The gists of the experimental results are :
1) When the volume of sand used to prepare a specimen is kept constant, the relation between the change of specimen height and the moisture content can be drawn as a concave curve. And at the moisture per cent where the specimen height becomes minimum, the permeability value becomes maximum.
2) The more the bentonite addition, the lower the specimen height, if the degree of ramming is constant. But the moisture per cent in which the specimen height becomes minimum, increases gradually in the case of adding bentonite.
3) From the view points of Dietert's flowability or compressivility and of Kyle's moldability, synthetic sand No. III or IV is most useful and stable.
4) Flowability of this synthetic sand in dry state is preferable and the type of grain size distribution is normal.
5) The emphirical formula formed on the relation between specimen height H and the number of ramming N becomes
H·N0.0478=50.8抄録全体を表示PDF形式でダウンロード (1283K) -
早川 一之, 渡部 多喜雄, 小野 伊祐, 三浦 孝1956 年 28 巻 7 号 p. 498-503
発行日: 1956/07/25
公開日: 2012/11/09
ジャーナル フリーIn general, there exists some clay balls in the molding sands which have been mulled by the mulling equipment, and very often they will give ill effects on the properties of molding sands.
The authors have researched the effects which are given by moisture, clay content and grain size to the formation of clay balls, and then the authors have observed the condition of their formation by changing the order and the way of water addition.
Results of these experiments are as follows ;
The order or the way of water addition which does not occur the segregation of water, clay and so on, is the best and the quantity of generating clay balls increases depending on the increase of moisture, especially in the range over the critical water content.抄録全体を表示PDF形式でダウンロード (798K) -
―アルミニウム還元法について―谷村 凞, 越谷 哲郎1956 年 28 巻 7 号 p. 503-506
発行日: 1956/07/25
公開日: 2012/11/09
ジャーナル フリーA simple method for determining the total oxygen in iron and steel was studied.
Sample of iron or steel in sheet form is sandwitched between two aluminium sheets of high purity. In the stream of purified hydrogen the sandwitch is melted at 1100°C.
Oxygen in iron and steel is converted to alumina in the melted alloy. This alumina is separated chemically and weighed and the oxygen is calculated.
To get a low blank value, various precautions are necessary. Some results of this method were compared with the values of the vacuum fusion method. It is known that this method gives a satisfactory result in mild steel. In the case of cast iron, blank value is not low enough to give a satisfactory result.抄録全体を表示PDF形式でダウンロード (668K)
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