巻号一覧
後続誌
26 巻, 9 号
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研究論文
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— 主して抗折試驗の成績について —臼井 太一郞1954 年 26 巻 9 号 p. 459-465
発行日: 1954/09/25
公開日: 2012/11/14
ジャーナル フリーThis study concerns the cast iron reinforced with the Cast-in mild steel inserted. To increase the bending strength, the following procedures should be taken. 1. The grid must be inserted in tension side. 2. It is more effective to insert the grid far from the neutral surface in the range where it is completely fused with the wall. The author obtained 19% reinforcement. 3. Practically, it is safe to put the grid near the center of the bar, then about 15% of reinforcement is obtained. 4. Deflection is increased by 18% max. and this does not conform to the max. bending strength in size of the grid.抄録全体を表示PDF形式でダウンロード (727K) -
— 通氣性について —牛山 五介, 喜多 新男, 岡倉 常之1954 年 26 巻 9 号 p. 465-472
発行日: 1954/09/25
公開日: 2012/11/14
ジャーナル フリーThis paper is prepared to report the result of a discussion made on the effects of moisture, ramming energy, grain size distribution, bentonite and these combined factors upon green permeability of three kinds of base sands described in the previous report. Then the relation between deformability |b| and permeability was discussed. The gist of the discussion is as follows : 1) The moisture content in which the permeability becomes maximum is close to the content in which the variation of specimen height, when rammed, becomes greatest. 2) In general, when the number of blow exceeds two, there exists a proportional relation between permeability and logarithm of ramming number. If the gradient of this line showing the above described relation is culculated by the method of least squares and is named |β|, then |β| seems to change with the variation of grain size distribution and bentonite, moisture content, etc. 3) |β| seems to be maximum at the suitable moisture content for each sand and it increases again as the increasing of moisture content. 4) |β| increases with a bentonite addition. 5) Changes of permeability due to ramming is most stable in Base Sand Ⅱ.抄録全体を表示PDF形式でダウンロード (842K) -
— 特に砂の粒形の測定について —鹿島 次郞1954 年 26 巻 9 号 p. 472-476
発行日: 1954/09/25
公開日: 2012/11/14
ジャーナル フリーFor the purpose of determining the semblance of a molding sand grain, the author has made the research on the measuring method of the surface area of the sands of a unit weight. 1) Ethylene-glycol is added to a certain amount of sands. 2) In order to expel the excess ethylene-glycol which adheres to the surface of sands, a centrifugal-separator is used. 3) The residual ethylene-glycol is analysed chemically with N/2 K2Cr2O7 solution. With the method mentioned above, the author has determined the quantity of the residual ethylene-glycol and this made us possible the comparison of the semblance of sand grains which had passed a sieve having the same openings. The artificial ball-like grass grains of 48 to 200 mesh were used as the standard semblance in this experiment.抄録全体を表示PDF形式でダウンロード (655K) -
礒野 好治1954 年 26 巻 9 号 p. 477-482
発行日: 1954/09/25
公開日: 2012/11/14
ジャーナル フリーAlthough the study of grain shape of silica sand in connection with the properties of moulding sand is important in the sand moulding practice, such a study has not yet been carried out due to the lack of suitable methods for the comparison of grain shape. The author, this time, has investigated both the construction of the measuring apparatus and the methods of determining the grain shape of silica sand by the air permeability method based on the work of W. Davies and W. J. Rees. The summary of the results obtained shall be listed hereafter. (1) The grain shape of silica sand can be determined by the ratio of the actual specific surface to the theoretical specific surface by an air permeability method. (2) When the sand grain is introduced into the burette, the more the packing, the higher the coefficient of angularity, therefore the coefficient of angularity must be expressed by the average value of the coefficients of angularity which are taken from several determinations.抄録全体を表示PDF形式でダウンロード (847K) -
—定着用ハイポの混入に基く測定誤差について—河野 良治郞, 鈴木 宗男1954 年 26 巻 9 号 p. 483-487
発行日: 1954/09/25
公開日: 2012/11/14
ジャーナル フリーThe limit of error in the case of sulphur determination in cast iron or steel by the sulphur print method, as one of the rapid quantitative analysis method, is kept in ± 0.006%. But, once this method is introduced to the foundries, the value taken is sometimes out of the error limit. Consequently this method is often thought to be unreliable. According to the investigation on this cause, the authors have discovered that this is effected by the intermix of small amount of sodium thiosulphate into sulphuric solution and this results in the intensification of darkness on the photographic paper. In this report, the effect of the intermix of the fixing solution shall be announced hereafter. The conclusions derived are as follows : (1) When sodium thiosulphate of 0.076 g/L, 0.153 g/L and 0.320 g/L are mixed into sulphuric solution respectivly, the sulphur content of 0.04% shifts up to 0.048%, 0.075% and 0.103%. (2) In case of graphite rich cast iron, the darkness on plate was intensified remarkably. (3) The reason why the concentration of sulphur is increased when mixed with sodium thiosulphate solution can be explained theoretically as follows : FeS + H2SO4 → FeSO4 + H2S (1)
H2S + 2 AgBr → Ag2S + 2 HBr (2)
Fe++ + Ag+ + Fe+++ + Ag (3)
Na2S2O3 + H2SO4 → H2S2O3 + Na2SO4
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→H2SO3 + S
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→H2O + SO2
2 Ag + S → Ag2S (4)
2 Fe+++ + H2S → 2 Fe+++ 2 H + S (5) The intensification of darkness is consequent on the repeated reactions, (1)···(5). (H. M.)抄録全体を表示PDF形式でダウンロード (770K)
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