巻号一覧
後続誌
31 巻, 11 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
-
沖 進1959 年 31 巻 11 号 p. 1057-1063
発行日: 1959/11/25
公開日: 2012/10/31
ジャーナル フリーThe Author has derived the equation
[{(W+L)/T}+13]/3{0.6(H/D)+4}={f(Vr/Vc)}/(Vr/Vc)1⁄3
from the equation
(Vr/Sr)/(Vc/Sc)=f(Vr/Vc)
which was given by Caine, Adams and others, and shows that Bishop's diagram, which represents the relationship between (W+L)/T and Vr/Vc, may be obtained from the graphical solution of that epuation.
The Author has improved Adams' theoretical equation, and derived the following equation,
{(W+L)/T}p=[13.8(Vr/Vc)2⁄3/α{(1−β)(Vr/Vc)−β}]−13
where, p is to denote the main part of the casting, β is coefficient of volume contraction by solidification, and α is given by
α=4.6√τ(Vc/Vp)1⁄3/q{0.6(H/D)+4}
where τ is the ratio (solidification time of riser)/(expected solidification time of riser when the riser is supposed not to be specially insulated.), Vp is the volume of main body of casting and q is the ratio (apparent volume of solid in riser including liquid which can not flow freely)/(actual volume of solid in riser).
Thus, he has obtained Bishop-type diagrams theoretically for various alloys, for castings having attached part of various volumes and for variously insulated risers with various H/D values.抄録全体を表示PDF形式でダウンロード (652K) -
本間 正雄, 湊 昭1959 年 31 巻 11 号 p. 1064-1072
発行日: 1959/11/25
公開日: 2012/10/31
ジャーナル フリーSynthetic Fe-C-Si alloys having various oxygen contents and commercial pig irons were melted under low pressure for 5 to 60 mn at the various temperature, and the change of structure, chemical composition and analytical oxygen amounts and others were examined.
Following results were obtained
(1) In the case of the melting by alumina crucible.
(i) The structure of Fe-C-Si alloys which were produced by the vacuum-melting for 5 mn at 1350 to 1600°C were undercooled fine granular graphite and ferrite matrix, having no relation with oxygen contents of original raw iron. In the case of the vacuum-melting for 10 mn or longer at 1350 to 1400°C, the structures obtained were also undercooled fine granular graphite and ferrite matrix, while in the temperature over 1450°C, it became undercooled white cast iron accompanied with temper carbon.
(ii) The amounts of elements such as C, Mn, S, N2 and H2 in iron decreased by the vacuum-melting, however Si and Al increased with the increase of treating time and temperature, being caused with the reaction of metal and crucible.
(iii) In hyper-eutectic cast iron treated by the vacuum-melting, primary graphite was spheroidized by inoculation of 0.2%Fe-Si, but by inoculation of 0.5%Ca-Si, all graphite was easily spheroidized.
(iv) In the case of commercial pig iron even the vacuum-melting at 1550°C, for 60 mn., it was difficult to produce the structure of undercooled white cast iron.
(2) In the case of the melting by graphite crucible.
The iron was supersaturated by the recarbonization from graphite crucible, the structure was composed of undercooled fine granular graphite with extremely coarsed primary flake graphite and ferrite matrix. The undercooled white cast iron could not be obtained.抄録全体を表示PDF形式でダウンロード (1109K) -
雄谷 重夫, 本間 梅夫1959 年 31 巻 11 号 p. 1073-1077
発行日: 1959/11/25
公開日: 2012/10/31
ジャーナル フリーThis is the third progress report on the melt quality of 85-5-5-5 red brass, and deals with the effect of hydrogen bubbling in the melt on the gas absorption and the behavior of dissolved gas.
Hydrogen bubbling is more effective on the gas absorption in the melt than the case of water vapor bubbling or exposing mentioned in the previous paper, and the fracture characteristics of the chill-blocks may vary with the more gas absorptions in the same way as in the latter case. A consideration is also turned to the general phenomena of gas absorption in 85-5-5-5 red brass.抄録全体を表示PDF形式でダウンロード (634K) -
原田 梅治, 西山 圭三1959 年 31 巻 11 号 p. 1078-1083
発行日: 1959/11/25
公開日: 2012/10/31
ジャーナル フリーWe investigated the penetration and fusion of four kinds of typical foundry silica sands−synthetic silica sand, conical silica sand, natural silica and beach sand−in Tokai district. Each fineness of them is 35, 48 and 65 mesh, and the molten metal of cast-steel was poured at about 1550°C.
Considering both the results of this test and the fundamental property of each sand obtained from our previous investigations, we found that the penetration and fusion of each sand has a close relation with its crystal structure which was also related to its geological origin and manufacturing method. Our recognition of this fact will lead us to the better selection and maintainance of foundry silica sand in our moulding work.
Furthermore, we shall continue our experiment on each sand in small grain size and have an honour of presenting the general conclusion of our all test in the next report.抄録全体を表示PDF形式でダウンロード (693K) -
小林 一典1959 年 31 巻 11 号 p. 1083-1088
発行日: 1959/11/25
公開日: 2012/10/31
ジャーナル フリーThe large difference between shell mold and normal sand mold is that in the former process phenol resin has been used as the binder of mold sand, but on the contrary in the latter clay or bentonite has been used as the binder. Phenol resin decomposes easily at high temperature.
The author has investigated the properties of shell mold at high temperature to make distinct the cause and counter-measure of defects of shell mold castings.抄録全体を表示PDF形式でダウンロード (649K)
- |<
- <
- 1
- >
- >|