巻号一覧
1967 巻 (1967)
- 51 号 p. 2-
- 50 号 p. 2-
- 49 号 p. 2-
- 48 号 p. 2-
1967 巻, 48 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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II-石炭系炭素電極の気中放電特性本田 英昌, 真田 雄三, 古田 毅1967 年 1967 巻 48 号 p. 2-7
発行日: 1967/03/05
公開日: 2010/06/28
ジャーナル フリーThe electric discharging tests under various conditions have been examined on those coal carbon electrodes which were heat-treated at temperatures between 800°C and 2800°C. The electrode specimens were prepared from Akabira weakly-caking coal (d.a.f.C=83.40%) and from Itmann strongly-coking coal (d.a.f.C=90.2%) by means of the cold binderless molding at pressures of 1000 and 2000kg/cm2 respectively.
The change in the threshold voltage before and after repeating the short-duration discharge (ΔVr) was found to be sensitive to temperature and retention time of the heat treatment.The voltage change caused by a continuous discharge for five minutes (ΔVc) and thedimension of craters as well as the amount of consumption (Nc) exibited minima at about2000°C when they were plotted against heat treatment temperature (HTT). The voltagechange due to impulsive discharge (ΔVi) as well as the occurence of short-circuit (Ni) showed a maximum and a minimum for HTT. It was concluded that the coal carbon heattreated at about 2000°C was the most able one in all kinds of the discharging test examined.
For Akabira-coal carbons, moreover, some correlations between ΔVr and HB/ρ (Brinnel hardness/electrical resistance), between ΔVi and σ/E (flexural strength/Young's modulus), and between ΔVc or Ni and contact potential have been found. It seems that the larger the mechanical strength, the flexibility and the electrical conductivity of carbon electrodes are, the better the electric discharging properties抄録全体を表示PDF形式でダウンロード (1600K) -
1967 年 1967 巻 48 号 p. 7
発行日: 1967年
公開日: 2011/03/01
ジャーナル フリーPDF形式でダウンロード (59K) -
松川 達夫, 庄司 啓一郎1967 年 1967 巻 48 号 p. 8-12
発行日: 1967/03/05
公開日: 2010/06/28
ジャーナル フリーCopper-lead-alloy coated graphite powders containing 40-50% graphite were pressed and sintered in hydrogen. The sintering process and properties of sintered brush were examined. The results obtained are as follows:
(1) Thermal expansion in the pressed direction during sintering affects the properties of sintered brush.
(2) The brushes sintered at 400-500°C have sufficient bending strength and low electrical resistivity.
(3) Friction coefficient of sintered brushdecreases with increasing graphite content, and 1-2% lead in brush structure lowers and stabilizes friction coefficient.
(4) Thermal expansion of sintered brush shows much higher value in the pressed direction than in the direction perpendicular to it.
(5) The distributions of copper and graphite are very uniform in the structure of sintered brush, and wearing characteristics of the brush are superior.抄録全体を表示PDF形式でダウンロード (672K) -
高橋 広治, 武政 隆一1967 年 1967 巻 48 号 p. 13-23
発行日: 1967/03/05
公開日: 2010/06/28
ジャーナル フリーミル用直流機の如くピーク負荷のかかる機械ではカッパードラッギングが発生し易く, これがため閃絡を起こす危険がある。
本文ではドラッギング現象についてその原因およびドラッギソグ対策について述べた。
これまでの調査結果によるとドラッギングはピーク負荷時における集中電流により, 軟化された整流子面上をブラシ摺動するため.発生することが推定された。したがって対策としてはドラッギングは整流子面上に均一な皮膜が生成され, かつ潤滑性の良好なブラシを便用することにより防止し得られるわけである。本文ではこれらについて説明しさらに8台の大形直流機における試験結果について紹介する。抄録全体を表示PDF形式でダウンロード (3388K) -
稲垣 道夫, 神谷 寛一, 田岡 啓子1967 年 1967 巻 48 号 p. 24-31
発行日: 1967/03/05
公開日: 2010/06/28
ジャーナル フリーPDF形式でダウンロード (1000K)
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