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58 巻, 9 号
選択された号の論文の6件中1～6を表示しています
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研究論文
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上田 俶完, 谷 耕治, 石束 昌治1986 年 58 巻 9 号 p. 628-633
発行日: 1986/09/25
公開日: 2011/10/25
ジャーナル フリーThe life and oxidizing behavior of the cooling plate of the cement roasting kiln which were estimated from the thermobalance do not agree sometimes with its practical use. Therefore, experiments were performed under wearing by cement clinker at elevated temperatures. The behaviors of oxidation and consumption of the materials in the present method were in good accordance with the practical data. Especially, the oxidation at 1,100°C in the air well simulated the severest oxidation in the practical use. Addition of rare earth metal improved the heat resistance of cast steels, but its most suitable quantity was variable under various conditions. 0.2% rare earth addition was more effective than 1.0% addition. Co-base alloy was less heat resistive at 1,000°C but more heat resistive at 1,100°C than cast steels. Alumina coating on the cast steel cooling plate by plasma spray enhanced the resistance to accelerated oxidation with wearing by cement clinker.抄録全体を表示PDF形式でダウンロード (830K) -
田中 雄一, 内沢 久美, 井川 克也1986 年 58 巻 9 号 p. 634-641
発行日: 1986/09/25
公開日: 2011/10/25
ジャーナル フリーA study have been made to clarify the relationship between microstructures and fatigue limit of spheroidal graphite cast iron having ferrite and martensite mixed structures. The irons were prepared by quenching from the temperature that the ferrite and austenite coexist in equilibrium and tempering at 473K to 873K. Alternate bending fatigue tests were carried out on the unnotched and notched specimens. The fatigue limit increases with increasing hardness, while it tends to lower at hardness higher than HRC37. But the as-quenched iron has the highest fatigue limit on unnotched and notched specimens, although the hardness of the iron is lower than the tempered irons. Such an improvement in fatigue characteristics is attributed to the fact that because the retained austenite existed in martensite of as-quenched iron transforms to martensite during cyclic loading, the stress concentration is relaxed in the martensite. Therefore, the slower crack propagation is accompanied with the depression of isolated micro-crack generation at the vicinity of the eutectic cell boundaries and the graphite nodules ahead of the main crack.抄録全体を表示PDF形式でダウンロード (852K) -
山本 志郎, 田代 康統, 佐伯 啓治, 竹林 一成1986 年 58 巻 9 号 p. 642-646
発行日: 1986/09/25
公開日: 2011/10/25
ジャーナル フリーThe effect of melt surface vibration on the solidification manner was examined using 37%NH4Cl-H2O solution for a purpose of decreasing center line shrinkage pipes and defects around the inverted V segregation in steel castings. The effect of the melt surface vibration was inspected by measuring the degree of the accumulation of crystalline solids and obtaining many knowledges concerning effects of pouring temperature and number of vibration.抄録全体を表示PDF形式でダウンロード (612K) -
宮沢 信夫, 花崎 紘一, 菱川 康利1986 年 58 巻 9 号 p. 647-652
発行日: 1986/09/25
公開日: 2011/10/25
ジャーナル フリーIt has been observed in the previous examinations that the fractured surfaces of dry sand mold specimens bound with starch, which were blow-molded into heated metallic patterns, had different colors and hardnesses between surface layer and interior of the specimens, resulting from the migration of the aqueous solution of the starch to the surface layer. To clarify this migration phenomenon of the starch, molding sands with different quantities of water and starches having different viscosities were prepared in the heated metallic pattern. It was possible to produce hollow starch-shell core by means of increasing the surface strength and reducing the interior strength of the core by encouraging such migration of the starch. The hollow starch-shell cores manufactured on trial were used for the production of iron castings.抄録全体を表示PDF形式でダウンロード (667K) -
永井 恭一, 泉 真吾, 岸武 勝彦, 大和田野 利郎1986 年 58 巻 9 号 p. 653-658
発行日: 1986/09/25
公開日: 2011/10/25
ジャーナル フリーEffects of testing temperature and strain rate on the toughness of a ferritic spheroidal graphite cast iron were investigated by tension tests, three point bending tests of notched bar specimen and impact tests. Tensile and 0.2% proof strengthes increased monotonously with lowering the testing temperature and independent of the crosshead speed of testing machine. Elongation and reduction of area decreased abruptly at a transition temperature with lowering the testing temperature. Consequently, the fracture energy per unit volume showed obvious ductile-brittle transition with lowering the testing temperature and the transition temperature shifted toward the higher temperature by increasing the crosshead speed. J integral to initiate crack extension was evaluated from the fracture toughness tests at varied crosshead speeds, three point bending and instrumented Charpy tests. The J integral vs. temperature curves showed ductile-brittle transition with lowering the testing temperature. And, the transition temperature of J integral also shifted toward the higher temperature by increasing the crosshead speed. The transition temperatures for the fracture energy of tension test, J integral and Charpy impact value rose linearly with the logarithm of strain rate by about 17°C in every tenfold increase of strain rate.抄録全体を表示PDF形式でダウンロード (652K) -
藤井 則久, 後藤 明弘, 森本 庄吾, 岡田 千里1986 年 58 巻 9 号 p. 659-664
発行日: 1986/09/25
公開日: 2011/10/25
ジャーナル フリーIn aluminum squeeze casting machine, accurate weighing of molten aluminum was possible by using a thermoelectromotive force signal obtained from a pair of thermocouple sensor through a differentiator. Scattering in the weighing values by the present mechanism was mainly due to the synergistic effect of the variation of the working period of the thermocouple sensor, the variation of the period between the detecting time of the sensor and the discharging time of the air in the furnace, and the variation of the period between the discharging time of the air in the furnace and the closing time of the inlet for pouring the molten metal. It was found that variation of the period between the discharging time of the air in the furnace and the closing time of the inlet for pouring has especially large influence upon scattering in weighing values. When the maximum rising speed of the outer cylinder of the casting machine was set at 400mm/s, an accuracy of ±3% was obtained in weighing of 3kg of molten aluminum.抄録全体を表示PDF形式でダウンロード (660K)
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