巻号一覧
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24 巻, 7 号
選択された号の論文の5件中1～5を表示しています
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研究論文
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鹿島 次郎, 小森谷 肇1952 年 24 巻 7 号 p. 1-3
発行日: 1952/07/25
公開日: 2012/11/20
ジャーナル フリーThe method to measure the thermal decomposition ratio of core binders has been studied this time. In general, the partial atmospheric pressure in molds seems to be decreased when pouring is made. Consequently, the compression strength and the decomposition ratio of core surface in its low partial pressure of oxygen will be announced in this report : As the results of this test, the followings can be said, i. e, (1) the thermal decomposition ratio of organic binders decreases as the partial pressure of oxygen decreases. (2) the thermal decomposition ratio goes on decreasing in due order of urea resin, molasses, truline binder, dextrin, linceed oil and bakelite.抄録全体を表示PDF形式でダウンロード (605K) -
井野 彌一1952 年 24 巻 7 号 p. 4-5
発行日: 1952/07/25
公開日: 2012/11/20
ジャーナル フリーUsual sand for a green sand mold is difficult to be removed from a casting for less quartz and therefore such blacking as mica-powder and graphite is used. These usage becomes difficult to copy the model and to produce a good surface condition of a casting. The improvement of removing sand from a casting was tried here by the combination of silica sand containing much quartz and usual sand. The result of Kawaguchi sand plus 20% silica sand is better. Sand containing more quartz than 50% in the mineral analysis need not any blacking. (M. I.)抄録全体を表示PDF形式でダウンロード (540K) -
草間 廣, 北林 正雄1952 年 24 巻 7 号 p. 6-24
発行日: 1952/07/25
公開日: 2012/11/20
ジャーナル フリーIt has been said for a long time that high class cast iron was most suitable for the liner materials of high speed internal combustion engines. But recently it seems that the demand for cast iron with higher strength and hardness has increased gradually in response to the elevated character of those engines and from the view-point of wear resistance and their lives. And the main trend of today is to make this component part of cast iron of perfect pearlite structure or sorbitic pearlite structure with fine graphite distribution. The authors picked up three typical liner materials, that is, plain high class cast iron, Cu-Cr cast iron and Ni-Cr cast iron, and compared their physical and chemical properties from the various view-points as follows. Ⅰ Mass effect test (Sand Casting) Ⅱ Actual goods test (Centrifugal Casting) (a) Distribution of hardness.······as cast. (b) Tensile strength and hardness.······as cast, heat treated. (c) Repeated bending fatigue test.······as cast, heat treated. (d) Charpy impact test.······as cast, heat treated. (e) Oxidation at high temperature.······as cast. (f) Drying rotatory wear test.······as cast, heat treated. (g) Corrosion test.······as cast, heat treated. In the 1st report we cover the accomplishments of tests from Ⅰ to Ⅱ∼(d). The second reports the results of Ⅱ∼(e) ∼(f) and ∼g.抄録全体を表示PDF形式でダウンロード (2276K) -
茨木 正雄, 澤 民之助1952 年 24 巻 7 号 p. 24-32
発行日: 1952/07/25
公開日: 2012/11/20
ジャーナル フリーMelting iron at a constant temperature as high as possible, high Si content and low C one are the most necessary conditions for the melting operation of high class mallleable cast iron in a cupola. The experiment was tried by comparing the operation of sending a large amount of air with a high coke ratio, with the operation of less one with a low coke ratio. The results obtained were as follows : 1. Molten metal of a high temperature could be obtained with excess air and coke. 2. In order to get the component of high silicon and low carbon (C 2.7∼2.9% Si 0.9∼1.3%), (a) Original bed coke should be limited to the minimum. (b) A cupola should have a few tuyeres, a low height from tuyeres to charge door and a shallow hearth. (c) A large amount of air should be sent with the low pressure. 3. The temperature and the component of molton metal could be managed uniformly (a) by drying the cupola completly, (b) by keeping the cupola at a high temperature from the beginning of the charge and (c) by keeping the top surface of the bed coke at constant height. To judge the property of molten iron quickly, we could use the charging velocity, the melting velocity, the sparking of molten metal and the pictures on the surface of the molten metal.抄録全体を表示PDF形式でダウンロード (979K) -
—鑄物の燒入の意義について—岡本 正三, 鈴木 金男, 鳥取 友治郎, 阿部 雅一1952 年 24 巻 7 号 p. 32-39
発行日: 1952/07/25
公開日: 2012/11/20
ジャーナル フリーHigh silicon grid-irons as cast are quenched (into water) at 800∼830°C to improve their ductility, their electrical resistivity being a little increased by the treatment. The improvement is, from the micro-structural point of veiw, caused by both the graphitization during heating and the suppression of the precipitation of various iron-compounds in the iron matrix-making super-saturated iron due to the subsequent rapid cooling. The micro-structure is stable and unchanged till about 300° which is the highest using temperature of the iron.抄録全体を表示PDF形式でダウンロード (1168K)
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