巻号一覧
後続誌
64 巻, 3 号
選択された号の論文の8件中1～8を表示しています
- |<
- <
- 1
- >
- >|
研究論文
-
大政 光史, 大中 逸雄1992 年 64 巻 3 号 p. 167-172
発行日: 1992/03/25
公開日: 2011/06/25
ジャーナル フリーFlow of molten aluminum, mercury and water was observed through a pyrex glass or acrylic plate on one face of a plate-like cavity having a gate at the center of the bottom. Flow behavior in a cavity with narrow branches was also examined. The fluid was pushed up by nitrogen gas pressure. Although symmetrical flow was observed in the case of water and mercury, molten aluminum flowed to one side at first and then turned to the other. Numerical simulation showed that filling behavior of molten aluminum became asymmetry when contact angles larger than a critical value were used. It was shown that numerical calculation considering surface tension and contact angle is necessary to simulate the filling with lower velocities or in narrow cavities.抄録全体を表示PDF形式でダウンロード (573K) -
寺嶋 一彦, 野村 宏之, 笹川 英一郎1992 年 64 巻 3 号 p. 173-180
発行日: 1992/03/25
公開日: 2011/06/25
ジャーナル フリーThe purpose of this paper is to present an optimal moldability control system for the mulling process of return sand by efficient water addition using fuzzy theory. Firstly, mulling process of return sand is analyzed, and an adequate control of the first water injection is suggested to be indispensable for optimization of mulling process. Secondly, fuzzy control is applied to determine the quantity of first water injection reasonably. In fuzzy control, optimal quantity of first water injection is determined besed on the on-line data such as temperature, humidity, initial moisture content of return sand, bentonite content and set value of moldability index. Finally, through experiments, it is shown that moldability index of return sand can be controlled to the value in linear region near reference state by only first water injection. Further, it is demonstrated that control of first water injection by fuzzy theory is useful for optimization of return sand mulling.抄録全体を表示PDF形式でダウンロード (1147K) -
上田 泰, 桜井 市蔵, 松尾 國彦, 炭本 治喜, 中村 幸吉, 猪飼 靖1992 年 64 巻 3 号 p. 181-185
発行日: 1992/03/25
公開日: 2011/06/25
ジャーナル フリーInvar (Fe-36 % Ni) and Super-Invar (Fe-32 % Ni-5 % Co) are the most famous low thermal expansive Fe-alloy, but they have not been used for castings. We have investigated low thermal expansive cast irons that might have superior castability, machinability and damping capacity. We began the basic research on the relation between the mean coefficient of linear expansion and Ni-Co contents in Fe-2 % C-1 % Si, and examined many specimens which were made with a rapid melting and casting laboratory equipment. These data were analyzed with NAIS (Numerical Analysis with Interpolating System). The results were as follows. (1) At 373K, the minimum mean coefficient of linear expansion was -0.17 × 10-6/K in 24.3 % Ni-11.9 % Co in experimental value and -0.19 × 10-6/K in 24.3 % Ni-12.0 % Co in predicted value with NAIS. (2) At 473K, the minimum mean coefficient of linear expansion was -0.61 × 10-6/K in 24.3 % Ni-11.9 % Co in experimental value and -0.94 × 10-6/K in 24.4 % Ni-12.3 % Co in predicted value with NAIS. (3) Only a few quantities of martensite were found in austenite when the microstructures of the specimens with the minimum mean coefficient of linear expansion were examined.抄録全体を表示PDF形式でダウンロード (642K) -
大城 桂作, 羽木 秀樹, 田原 晃, 沢本 章, 池田 浩之, 林 安徳1992 年 64 巻 3 号 p. 186-191
発行日: 1992/03/25
公開日: 2011/06/25
ジャーナル フリーIn order to clarify the behavior of hydrogen in ferritic spheroidal graphite cast iron with heavy section, the diffusion coefficient and amount of absorbed hydrogen were measured for specimens cut from a 105 kg spheroidal graphite iron casting, by the use of electrochemical hydrogen permeation method. The results were compared with those on the steel plate of the same alloy contents as the matrix of casting. At room temperature, the diffusion coefficients in cast iron and steel were 1.3 × 10-9m2/s and 2.7 × 10-9m2/s, respectively. The spheroidal graphite cast iron contained more hydrogen than steel, and 80 to 90 vol % of whole hydrogen was diffusible and 10 to 20 vol % was undiffusible. Hydrogen should be stored at interface between graphite nodules and matrix as well as in lattice defects. A gas permeation experiment revealed that the permeation rate of hydrogen in cast iron was lower than that in steel at the temperature range from 403 K to 523 K.抄録全体を表示PDF形式でダウンロード (632K) -
小林 武, 糟谷 良和1992 年 64 巻 3 号 p. 192-197
発行日: 1992/03/25
公開日: 2011/06/25
ジャーナル フリーIn the evaporative pattern casting process, gas defects, lustrous carbon defects, and so on are becoming serious problems. In this study, simulations which dropped a heated steel ball on the evaporative pattern were carried out to investigate the behavior of thermal decomposition of the patten. The results obtained are summarized as follows : (1) The thermal decomposition rate of the evaporative pattern decreased with a increase in the ratio of polymethyl methacrylate (PMMA) in the pattern. (2) It was found that quantities of the liquefied resin generated through the thermal decomposition of the pattern increased with a decrease in the ratio of PMMA in the pattern. (3) As the ratio of PMMA in the pattern increases, the heat quantities required for thermal decomposition of the pattern increased.抄録全体を表示PDF形式でダウンロード (381K) -
小林 武, 市来 隆志, 田淵 久也1992 年 64 巻 3 号 p. 198-203
発行日: 1992/03/25
公開日: 2011/06/25
ジャーナル フリーIn Al-Sn alloy, there is a wide solid-liquid co-existing temperature range and low eutectic temperatue. A demelting treatment, which extracts eutectic molten metal from the solid-liquid co-existing range of this alloy, was carried out with the vacuum suction method. Then, the effects of the treatment conditions on the demelting ratio were investigated. It was found that the demelting ratio depend on the coefficient of the surface tension of molten Al-Sn alloy, the demelting temperature, and the time. As dendrite-arm spacing gets larger, the demelting ratio increases. If the demelting treatment was executed at an excessively high temperature for a long time, the porous aluminum cavities produced were crushed by the suction force. Resin could be injected into the porous alminium produced.抄録全体を表示PDF形式でダウンロード (458K)
技術報告
-
小松 俊作, 叶 良信1992 年 64 巻 3 号 p. 204-209
発行日: 1992/03/25
公開日: 2015/01/22
ジャーナル フリーPDF形式でダウンロード (2551K) -
安田 久, 小幡 文雄, 熊田 康雄1992 年 64 巻 3 号 p. 210-214
発行日: 1992/03/25
公開日: 2015/01/22
ジャーナル フリーPDF形式でダウンロード (2594K)
- |<
- <
- 1
- >
- >|