巻号一覧
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27 巻, 12 号
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研究論文
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五十嵐 勇, 大平 五郎, 井川 克也1955 年 27 巻 12 号 p. 813-821
発行日: 1955/12/25
公開日: 2012/11/12
ジャーナル フリーThe solidification process of cast iron containing a small amount of Te or Se was investigated by thermal analyeis and microscopic observation, applying quenching method on some of them. The flake graphite structure of pure Fe-C and Fe-C-Si alloy was converted into eutectic graphite, inverse-chill and finally it turned into ledeburite structure by increasing the content of Te or Se in iron. There existed shell type, nodular type in smaller size and mesh like graphite in these grey or inverse-chilld structure. Inoculation of Ca-Silicide to cast iron containing Te or Se reverted the above structures to flake graphite structure, sometimes ledebrite was accompanied with. The precipitation process of the abnormal graphites mentioned above was discussed by the microscopic observation of the samples quenched at various stages of eutectic solidification.抄録全体を表示PDF形式でダウンロード (1604K) -
森永 卓一, 高橋 恒夫, 高橋 仙之助1955 年 27 巻 12 号 p. 821-827
発行日: 1955/12/25
公開日: 2012/11/12
ジャーナル フリーContinuous casting of metals is not a new method and the nonferrous industry has been used the method extensively. In this research, we have accumlated valuable experience and have formed some difinite ideas on the proper operation. The equipment shown in Fig. 1 is provided with a holding furnace, spout, upper mold with water-cooled and lower mold which travels downward by means of a turbine pump at a constant rate. Just below the upper mold, spray rings are installed and which provide water direct to casting to hasten the solidification. Up to 80 1/min is sprayed through the rings. The molton metal is poured into the turdish (Fig. 2), which is an iron box lined with refractory. Having achieved a steady flow of the molton metal from the turndish into the upper mold, we made studies on molds and the shape of distributor. The mald, machined from a solid block of copper, has a 160 × 240 mm rectangular shape and the cooling water enters into the mold from the bottom part of it and exits from the top. The tables 2 and 5 show the summarized data and which we have obtained in running the above mentioned continuous machine. A number of holes and its position in a distributor varied widely as shown in Fig. 3. The coarse dendritic grain (banana-like) varied its shape by the number of holes and its position ; but we have found that the principle of 4-holes type is preferable. Tables 3 and 6 illustrate the mechanical properties of annealed sheets which are rolled from the continuous casting slabs. The directionality in a sheet is appeared remarkably in the transversal direction to the rolling. The blister appeared in a sheet is dispersed in a shape of particle, but is not coagurated.抄録全体を表示PDF形式でダウンロード (966K) -
堀田 一二三, 立道 有年1955 年 27 巻 12 号 p. 828-831
発行日: 1955/12/25
公開日: 2012/11/12
ジャーナル フリーThe authors have investigated the effects of sand grain and phenolic resin on the mechanical strength of shell mold. The results are as follows : (1) The packing efficiency is changed by the properties of sand, especialy sand grain shape Young's modulas show a max. value at well-packed sand ratio. (2) Youngs modulas is also affected by the flow characteristic of phenolic resin and the better the flow characteristic, the greater the strength. Moreover the flow characteristic of resin is much effective than its fineness. (3) Transverse strength has a certain relation with Young's modulas, therefore the use of well rounded sand and good flowable resin is effective on the improvement of mechanical properties of shell mold.抄録全体を表示PDF形式でダウンロード (631K) -
河野 良治郎, 奥山 歳生, 今尾 一右1955 年 27 巻 12 号 p. 832-835
発行日: 1955/12/25
公開日: 2012/11/12
ジャーナル フリーAuthors investigated the influence of roller weight of sand mill on the properties of synthetic sand changing the weight of roller from 1 to 20 kg and using a small laboratry use Sympson type sand mill which could mill sand of about 4 kg. Results obtained are as follows : 1. In case of using a heavier roller, the green compression strength was increased rapidly in a short period of milling, while in lighter roller it was slowly. But when the milling time was long enough with a lighter roller the compression strength approached to that of the case of heavier roller was used and lastly they agreeded each other. The difference between green permeability of the sand milled with a lighter roller and that of a heavier roller was almost constant regard less to the milling time and the green permeability of the later case was very low. 2. In case of a heavier roller, sand grains collapsed fairly by the pressure of roller and consequently the quantity of pan materials increased very much, that is : when the roller weight is 13∼20 kg, the A. F. S. clay per cent of the sand increased about two times of the unmilled sand. Then the roller weight is desirable to be as light as possible. To control the roller weight of Sympson type sand mill used today is mostly impossibie. Accordingly, it is also an important problem to make the weight of roller changeable easily.抄録全体を表示PDF形式でダウンロード (529K)
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