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33 巻, 11 号
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研究論文
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鈴木 和郎, 山岡 弘1961 年 33 巻 11 号 p. 761-770
発行日: 1961/11/25
公開日: 2012/10/29
ジャーナル フリーSubsequently to the shell mould and green sand mould, the measurements of the interfacial back pressure on the mould produced were conducted in the present report. When molten steel was poured into the lost wax mould, CO2 mould, oil sand mould and air setting mould under the casting conditions usually employed, From the results of these measurements, it was found that in comparison with the green sand mould, the mould containing an orgnic binder gives an unexpectedly low back pressure, while it has conventionally been considered that such a mould develops a considerably high back pressure in general. The results of the investigation are as follows.
1. As the effect of the pouring temperature of steel on the shell mould, some proportional relation between the maximum value of the interfacial back pressure on the mould and the pouring temperature is observed. The pouring temperature affects more remarkable effect on the lowering velocity of the back pressure rather than the maximum value mentioned above.
2. With respect to the interfacial back pressure of aluminium alloys on the mould, its generation of it was delayed and the back pressure showed a value extremely lower in comparison with the case of cast steel.
3. On copper alloys, the interfacial back pressure of phosphor bronze differs from that of aluminium alloys, but it rather resembles to the case of cast sleel. The interfacial back pressure in this case, however, shows a value slightly lower than that of cast steel.抄録全体を表示PDF形式でダウンロード (792K) -
平方 幸一1961 年 33 巻 11 号 p. 770-775
発行日: 1961/11/25
公開日: 2012/10/29
ジャーナル フリーIn the previous report, the author reported that the relationship between the height of a sand specimen and the number of ramming was expressed by the following formula:
yx=a+b log x
x : the number of ramming
yx: the height of specimen when the number of ramming is x-th.
a, b : const.
In this experiment, the effect of mulling time of natural molding sands on the value of a, |b| and ε (= (y1−y10)⁄y1 |b|/a) is studied. By a comparison between the above mentioned effect and the was effect of bond on these values of synthetic molding sands previously gotten the following tendencies should be pointed out : concerning a sand received such sand-treatment that the compression strength of a sand becomes greater, after snch treatment though the value of a of this sand is increased or decreased by a sort of sand, but that of |b| or ε is increased.抄録全体を表示PDF形式でダウンロード (724K) -
上田 俶完1961 年 33 巻 11 号 p. 776-785
発行日: 1961/11/25
公開日: 2012/10/29
ジャーナル フリーFe-C-Si alloys containing nitrogen were annealed at temperatures between 300 and 900°C, and then nitrogen was analysed by Keldahl's distillation method and ester-halogen method. The results obtained are as follows:
(1) On annealing at 300 and 400°C, nitrogen by ester-halogen method only increases. It may depend on the forming of iron nitrides.
(2) On annealing at 500 and 600°C, the rate of formation of silicon nitride speeds up, and most of nitrogen in iron converts to silicon nitride.
(3) A part of silicon nitride may be soluble in dil. HCl.
Next, 2%Si-iron, Fe-C-Si alloy and cast iron were nitrided with NH3, and the forms of silicon nitride obtained in them by X-ray diffraction method were studied. There was the mixture of α-Si3N4 and β-Si3N4 in silicon iron and Fe-C-Si alloy, and α-Si3N4 only in cast iron.
The extracted residues of Fe-C-Si alloy, containing normal nitrogen content, were observed by electron microscope. Rhombic and hexagonal crystals were found. The former may be α-Si3N4, and the latter β-Si3N4.抄録全体を表示PDF形式でダウンロード (833K) -
須藤 幸治1961 年 33 巻 11 号 p. 786-796
発行日: 1961/11/25
公開日: 2012/10/29
ジャーナル フリー1. We can note air volume (m3) per kg. of carbon, which carres pond to variable, combustion ratio CO/CO2 in the exit gas of cupola, by calculation at standard condition.
These noted air volumes must be combined on kg. of carbon with some speed and pressure. The relation of speed and pressure noted air volumes sapplied, plotted a curve as equation V=√2gH. This curve became a tangential curve (tan ± x) of trigonometrie function (Fig. 1). Thes cure has a point of inflection at tan x=0. There combustion percentage is about CO2 (13%) and CO (13.2%).
2. In a cupola operation, we have plotted a curve line of blast condition in relation of pressure ( √mmHg at wind box) and speed (Nm3/m2-h) as equation V= √2gH.
This curve line became a tangential curve (tan ± x) (Fig. 2). Therefore CO2 rich melting to be operate at baslt curve tan-x.
3. Generally high tension cast iron must be operate at CO rich melting. Specially ductile cast iron must be operate at combustion ratos CO/CO2>2.0 of exit gas in cupola, as raw material steel scrap only.抄録全体を表示PDF形式でダウンロード (958K) -
落合 三雄1961 年 33 巻 11 号 p. 796-807
発行日: 1961/11/25
公開日: 2012/10/29
ジャーナル フリーThe mould speeds are a foundamental factor which influence on the mechanical properties of the centrifugal steel castings, but also, size of wall thickness of the parts is greatly one of foundamental factcrs.
Mechanical properties of centrifugal tubular steel castings causes the various phenomena in connecting with the mould speeds of from 1110 to 1600 r.p.m and size of wall thickness of from 20 to 30mm, and may be able to state the outline on plane carbon steel castings (C=0.24%) and copper steel castings (C=0.24%, Cu=1.15%) in Connecting with the mould speeds and wall thickness of the castings as follows:
① When the wall thickness of the parts is constant but thin wall thickness, the more mould speeds increases, the more centrifugal force enlarges, but the acting times on the parts are shartened. Accordingly, solidifying and cooling rate quicken and mechanical properties has brittleness.
And if wall thickness is thick wall, the more mould speeds increase, the more centrifugal forces enlarge and grain size is refined. Moreover, solidifying and cooling rate is a little mitigated than for the parts with thin wall thickness. Therefore, mechanical properties are improved.
② When teh mould was rotated with constant speed and also has low speeds, if the parts has thick wall, refining of grain size is imposible and mechanical properties are not improved so that solidifying and cooling rate has controled with the wall thickness. But the mould speeds to improved mechanical properties of the castings must be suitable one for the wall thickness of the castings if the mould has high speed.
③ Segregation of carbon does not influence on mechanical properties but segregation of copper influences on mechanical properties, severly.抄録全体を表示PDF形式でダウンロード (1409K)
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