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33 巻, 4 号
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研究論文
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鈴木 和郎, 山岡 弘1961 年 33 巻 4 号 p. 253-259
発行日: 1961/04/25
公開日: 2012/10/29
ジャーナル フリーAs the object of this sutdy is to know the conditions of occurence of the blow holes of steel castings, experiments were made by using low carbon steel which is generally believed to be improper for shell moulds. Especially, the study was made on the effect such conditions as the rise of gas from the heated phenol resin of various amount, variation in thickness of shells and grain size, material quality of ohter backing materials, and resin coated sand to the back pressure of the adjacent regions and the point 5mm inside the mould from the surface. The results obtained are as follows;
1. The back pressure around the cavity surface of the shell moulds reaches its maximum 2 to 5 seconds after casting the molten metal, and vanishes 3 to 4 minutes after casting.
2. As for the effect of adding resin, the more resin is added, the more back pressure incrases. This tendency is seen more remarkably in using resin coated sand than in adding the powdered resin.
3. As for the effect of the thickness of the shell, a sudden rise of back pressure is seen when it is 10 to 12mm in thichness.
4. As for the back-up material, in general, if the same grain size sand is chosen, back pressure in steel shot mould is bigger than that in silica sand mould.抄録全体を表示PDF形式でダウンロード (745K) -
谷村 凞, 松田 公扶, 和栗 真次郎1961 年 33 巻 4 号 p. 260-265
発行日: 1961/04/25
公開日: 2012/10/29
ジャーナル フリーIn spite of many researres, the mechanism of nodular graphite formation in cast iron is not yet clear.
Several hypotheses, which assumed absorption of nodule-promoting elements such as Mg or Ce on graphite nodule, have been presented.
In order to criticize such hypothesis, the authors made an experiment, using radioisotopes of nodule-promoting elements, Ca45 and Ce141.
Ca45Si and metallic Ce141 were added to molten nickel-carbon alloys and nodular graphite was obtained.
The structure was examined by autoradiography and compared with microstructure.
As the result, the following conclusion was obtained:
Nodule-promoting element Ca45 or Ce141 is not absorbed on the surface of graphite nodules.
Ca45 Ce141 are enriched in the eutectic structure of Ni-C-Ca and Ni-C-Ce, wich are formed between graphite nodules.抄録全体を表示PDF形式でダウンロード (903K) -
丸山 益輝1961 年 33 巻 4 号 p. 266-271
発行日: 1961/04/25
公開日: 2012/10/29
ジャーナル フリーIn order to know the detail of the role of deoxydation in spheroidizing of graphite in cast iron, graphite forms in iron and the changes by inoculation were studied.
It is hard to deposit the spheroidal graphite only by deoxydation, but deoxydation is one of the most indispensable conditions to the deposition of spheroidal graphite.
Effect of Ca-Si alloy as an agent for spheroidizing graphite are based on deoxydation and desulphurization by calcium component in the alloy and on the formation of spheroidal graphite nucles by calcium and silicon components in it.
When the melt of cast iron was satisfactorily deoxydized and desulphurized, the deposition of spheroidal graphite can be obtained by the addition of Fe-Si alloy without the so-called graphite spheroidizing elements, such as magnesium, calcium, cerium and so on.抄録全体を表示PDF形式でダウンロード (735K) -
竹内 栄一1961 年 33 巻 4 号 p. 271-277
発行日: 1961/04/25
公開日: 2012/10/29
ジャーナル フリーBased on the results of our previous research, we scrutinized the wear phenomenon of the heat treated titanium cast iron with eutectic graphite structure. We tested the wear of the cast iron which was heat treated, such as annealing, hardening, tempering or isothermal treatment under the constant conditon. As the result, it was found that the anneald cast iron had the supassing wear resistance at about 550°C and hardened or tempered cast iron had good wear resistance at 200°C to 300°C. However, we came to a conclusion that the isothemally treated cast iron was much superior in the wear resistance to the cast iron treated in two methods above mentioned.抄録全体を表示PDF形式でダウンロード (841K) -
大平 五郎, 小泉 真人1961 年 33 巻 4 号 p. 277-281
発行日: 1961/04/25
公開日: 2012/10/29
ジャーナル フリーPure aluminium and 1.6%Si-Al alloy were cast at 750° or 700°C into a straight narrow channel attached by a small well discribed in Fig.1. The temperature of the flowing metal was measured by applying an electro-magnetic oscillograph connected to thermo-couples of 0.1mm diameter.
The distance between the well and the gate gave influence upon the flow length in the narrow channel, and the relation between the temperature of the running metal and flow length were investigeted and discussed.
The results are concluded as follows;
(1) Decreasing of a partial foward flow length L3 from the well is similar to that of the flow length of a channel started from the well in which casting temperature is lowered till the melting point.
(2) The flow length is extended when the running front which is rather cooled is removed from system.
(3) Running metal of higher temperature cools rapidly if it contacts to that of lower temperature as by chill action. Though they could not be in one uniform temperature.抄録全体を表示PDF形式でダウンロード (635K) -
堀田 秀次1961 年 33 巻 4 号 p. 281-287
発行日: 1961/04/25
公開日: 2012/10/29
ジャーナル フリーIn this paper, the auther presents the effects of conditions in hardening the sand mould by CO2 process to the compresive strength and the permeability of the mould. The conditions considered are, the grain-size of silica sand, adding-amount of water glass, blowing time of CO2, length of time after blowing, as well as the multiple use of molding sand.
The results obtained are as follows:
(1) The finer grain of silica used, the greater compresive strength and the smaller permeability of the mould are obtained.
(2) If the JIS-No.1 water glass is chosen as on adding agent, the mould has the maximum compresive strength when 4 to 5 % water glass is added. However, if JIS-No.2 or No.3 water glass is chosen, the compresive strength of mould increases along with the increase of the blowing time.
(3) Along with the time after blowing of CO2, the compresive strength of mould treated strength of the mould treated with No.2 or No.3 water glass, shows no remarkable change.
(4) Multiple use of the same sand causes the decrease of both compresive strength and permeabilility of the mould.抄録全体を表示PDF形式でダウンロード (620K)
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