巻号一覧
後続誌
37 巻, 2 号
選択された号の論文の5件中1～5を表示しています
- |<
- <
- 1
- >
- >|
研究論文
-
財満 鎮雄, 加茂 進, 桜田 孝幸1965 年 37 巻 2 号 p. 101-108
発行日: 1965/02/25
公開日: 2012/10/11
ジャーナル フリーThere were many studies on the machinability of aluminium alloys, but they treated mainly the machinability in turning and few in the fields of drilling. When the machinability on steel and iron is discussed, it is a way to emphasize the tool durabilty, but the problem is how to finish the drilling surface than the durability of the tool in aluminium alloys, and the machinability is rather affected by the creation of built-up edge in turning. Then, it is not cleared that whether the machinability in drilling has some similarity to that in turning or not.
In this paper, the machinability in drilling the aluminium-silicon cast alloys changing silicon contents from 1 to 30% was investigated and the effect of silicon to the machinability was to be considered. It seemed that the machinability in drilling had to be discussed several factors; the drilling resitance, the tool durability, the roughness of drilling surface, the chip formation, the chip disposal and others. The drilling resistance, the drilling time, the drilling surface and the chip formation were chiefly studied in this investigation. As the results, the machinability in drilling is better in the alloys of 8∼12% Si than any others.
This study owed its expenses to the Scholarship Committee of the Institute of Light Metal Foundation to which the authors express their thanks.抄録全体を表示PDF形式でダウンロード (1007K) -
椙山 正孝, 林 清讃1965 年 37 巻 2 号 p. 108-115
発行日: 1965/02/25
公開日: 2012/10/11
ジャーナル フリーThis work covers the mechanical and physical tests on zinc-aluminium casting alloys containing 4-50% aluminium cast into various moulds such as boat-type chill mould, vertical chill mould conventionally used and sand mould. The properties of these alloys were measured both in conditions as-cast and as stabilized at 100°C for 10 days.
(1) The properties of the alloys of high Al content varies considerably with mould condition.
(2) The alloys containing more than approximately 22%Al tend to show shrinkage cavities, casting the decrease of their properties. In these alloys, the mould condition that will produce directional solidification shall be an important factor.
(3) When the metal is cast into proper moulds such as boat-type chill, the tensile strength maximum at 22%Al of nearly eutectoid composition.
(4) The tensile strength of these alloys decreases by the stabilizing treatment, but the elongation and impact strength usually increases by it.抄録全体を表示PDF形式でダウンロード (1302K) -
矢作 恭蔵1965 年 37 巻 2 号 p. 115-125
発行日: 1965/02/25
公開日: 2012/10/11
ジャーナル フリーIn this report, effects of the ratio of carbon to silicon on the shrinkage defects were studied. Cast irons which have various contents of carbon and silicon with the same carbon equivalent, were melted and cast to observe the shrinkage behaviours.
The results were as follows.
1. The cast irons with less silicon content are not graphitized easily, and apt to get shrinkage defects. Silicon content should be more than the critical value to avoid shrinkage defects.
2. Concerning the certain carbon equivalent, low carbon-high silicon-irons were inferior to high carbon-low silicon-irons as to the graphite volume caused by the eutectic reaction.
3. Therefore, a proper relation between the amounts of carbon and silicon should be existed to avoid the shrinkage.
Lastly, the author explained some examples in actual foundry practice applying the principles reported in the series of their investigations.抄録全体を表示PDF形式でダウンロード (1257K) -
徳永 洋一1965 年 37 巻 2 号 p. 126-135
発行日: 1965/02/25
公開日: 2012/10/11
ジャーナル フリーThe investigations were carried out on the physical and chemical properties of high strenth gray irons. The structural types of cast irons used for the examinations were flake-pearlitic, nodular-pearlitic, flake-acicular, eutectic graphite-acicular and nodular-acicular respectively. The results obtained were as follows.
1) Since nodular-graphite irons had higher Young's modulus and lower internal friction than flake graphite irons, the marked effect of acicular matrix were not observed.
2) Due to the spherodization of graphite, there appeared remarkable increase in fatigue strength. In addition, a further improvement could be expected in the fatigue characteristics of the nodular-acicular irons as compared to those of pearlitic irons.
3) Acicular irons showed a low machinability, which was more directly affected by the hard matrix than the graphite precipitated.
4) In dry wear test (rolling with sliding of 10%) versus ordinary cast iron, acicular irons gave much better wear resistance than pearlitic irons. In case of combination with martensitic tool steel, however, the wear loss of acicular irons were increased comparatively.
5) The agitating corrosion test in 3% NaCl solution showed that nodula-acicular irons were remarkably corroded and the presence of copper in flake-acicular iron increased corrosion resistance. On the other hand, the resistance to cavitation-erosion was improved comparatively in nodular-acicular irons having high hardness.
6) Resistance to a growth on cycle-heating ion air was increased by spheroidizing of graphite, but it was not so affected by the alloying elements contained in the acicular irons.抄録全体を表示PDF形式でダウンロード (1184K) -
堤 信久, 鈴木 松夫1965 年 37 巻 2 号 p. 136-144
発行日: 1965/02/25
公開日: 2012/10/11
ジャーナル フリーAlthough a little numbers of the impact fatigue test were carried out on steel, it was supposed that no test was performed on malleable iron. A repeated impact testing machine was designed and made in the laboratory. It is consisted of cam, hammer head of three types, frame, motor, reduction pulley and specimen support with low temperature bath. The way of producing repeated impact is the apparatus in which a cam raises a blow hammer head with a weight striking a beam specimen midway between the two edge supports at a rate of 92 blows per minute. By tasting normal black heart malleable iron, special malleable iron having various content of phosphorus, copper and molybdenum respectively, a shock energy-blow number diagram, i.e., E-N diagram, and the relation between blow numbers and alloy content in malleable iron were established as shown in detail in this paper.
The results obtained are as followings :
1) The E-N diagram obtained shows that in the case of lower shock energy the range of obtained blow numbers are developed widely.
2) The increase of phosphorus content produces fractuated blow numbers. The increase of both molybdenum and copper, however, have a tendency of increasing the numbers.
3) In the test at lower temperatures, it is observed that mean blow numbers are decreased with temperature.抄録全体を表示PDF形式でダウンロード (1056K)
- |<
- <
- 1
- >
- >|