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65 巻, 4 号
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研究論文
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田中 孝一, 寺嶋 一彦, 野村 宏之1993 年 65 巻 4 号 p. 277-283
発行日: 1993/04/25
公開日: 2011/06/22
ジャーナル フリーA series of experiments and computer simulations have been carried out in order to clarify cavity filling behavior during die casting. The study has been focused on flow behavior of melt injected under the reduced pressure. Cavity filling time is shown to be shorter in the case of the injection under the reduced pressure than that under the atmospheric one. Furthermore density of casting is found to be larger in the former case because of decreased entrapment of air in the final stage of filling. The decrease is attributed to smaller air pressure rise-up in unfilled area of the cavity, hence less picking-up of air in the casting. These results are explained reasonably with the simulation of the flow model. In addition, distribution of temperature and solid fraction of metal at the completely filled stage is predicted from the present simulation model.抄録全体を表示PDF形式でダウンロード (733K) -
川添 強, 松尾 信太郎1993 年 65 巻 4 号 p. 284-287
発行日: 1993/04/25
公開日: 2011/06/22
ジャーナル フリーFull scale experiments were conducted to decrease hydrogen gas in the molten metal of the Al-bronze in large working furnaces. In the case of casting by a low frequency furnace with an oil burner to shorten the melting time, a high content of hydrogen gas of about 2.5 ppm was absorbed by the melt and casting defects appeared in the ingot. Fluxes of MnO2 were effective for prevention of gas absorption. The optimum pipe for injection of nitrogen gas was selected from the viewpoint of the degassing efficiency and the necessary flow rate of nitrogen gas was reviewed.抄録全体を表示PDF形式でダウンロード (550K) -
大沢 嘉昭, 佐藤 彰, 生井 亨, 荒金 吾郎1993 年 65 巻 4 号 p. 288-293
発行日: 1993/04/25
公開日: 2011/06/22
ジャーナル フリーTwo application modes of ultrasonic vibration through steel horns to molten metals. 1) Vibration through a molten salt which does not react with the steel horn. 2) Ultrasonic vibration of molten metals by a steel horn coated with Al2O3 by plasma spray coating method. Ultrasonic vibration apparatus : 19 kHz, max 50 μm, 1.2 kW. Structures of Zn and Al alloy ingots applied ultrasonic vibration through molten LiCl-42 mol % KCl are refined, while the steel horn is kept out of damage. Ultrasonic vibration of molten metals by the steel horn coated with Al2O3 refines structures and decreases segregations in Al alloy ingots.抄録全体を表示PDF形式でダウンロード (903K) -
佐藤 勉, 久保田 耕平, 二宮 隆二1993 年 65 巻 4 号 p. 294-299
発行日: 1993/04/25
公開日: 2011/06/22
ジャーナル フリーThe fatigue strength, the microstructure in the fracture zone, and the fracture surface of Zn-7∼10 Al-0∼13. 5Cu-0.02 Mg alloys were studied. The results are as follows ; (1) Both Cu and Al improves the fatigue strength. (2) ε phase is effect to improve the fatigue strength much. (3) The new developed alloy, Zn-10 Al-7 Cu-0.02 Mg, has the fatigue strength of 160 MPa at 1 × 105 cycle. (4) The quasi-striation patterns are observed at more than 1 × 105 cycles.抄録全体を表示PDF形式でダウンロード (976K) -
中江 秀雄, 小泉 弘, 岡禎 一郎, 岡内 曠爾1993 年 65 巻 4 号 p. 300-305
発行日: 1993/04/25
公開日: 2011/06/22
ジャーナル フリーThe nuclei of eutectic graphite are not determinate though many investigators have researched on inoculation mechanism of cast iron. Among them CaC2 theory published by B. Lux in 1964 has many supports of it. On this point, we have considered that the nuclei of graphite must be cristobalite which is first formed as vitreous SiO2 from Si involved in almost all inoculants in molten iron and then crystallized under the existence of Ca. In this work the relation between Ca and inoculating effect was investigated. When pure Ca was inoculated as compared with typical inoculants, Ca-Si and Fe-Si, it had an obvious inoculating effect. So it was considered that SiO2 suspended in molten iron was crystallized with the catalytic action of Ca, and it worked as the heterogenious nuclei of eutectic graphite. Then next, inoculation experiments were done by using molten iron whose concentration of Si was so low that SiO2 could not exist thermodynamically. Consequently Ca-Si had a stable inoculating effect, but Ca didn't. From the fact above, it was proved that CaC2 has no inoculating effect, and Ca has an inoculating effect through the crystallization of SiO2 due to its catalytic action.抄録全体を表示PDF形式でダウンロード (628K) -
顔 炳華, 呉 坤齢1993 年 65 巻 4 号 p. 306-311
発行日: 1993/04/25
公開日: 2011/06/22
ジャーナル フリーOwing to the difficult machining of high chromium cast iron, it is hard to expand the application using as machine parts. Therefore, the proper cutting conditions and accumulation of basic data relating with this material is important. In this study, turning test of high chromium cast iron is carried out. From the results, ceramic tool is the most suitable for machining of this material, but the cutting speed more than 5 m/s and wet cutting must be avoided. From the diffusion reaction experiment, it is shown that P 10 has obvious diffusion layer, and cermet tool has not. But a large quantities of binder elements diffuse in the workpiece. In turning this material with K 10, tool wear is largest, but because the tool still retain sharp edge, the cutting force is most smallest. The surface roughness of workpiece finished by K 10 is large, but it is improved in wet cutting.抄録全体を表示PDF形式でダウンロード (875K) -
野口 徹, 鴨田 秀一, 佐藤 司, 佐々木 健二1993 年 65 巻 4 号 p. 312-318
発行日: 1993/04/25
公開日: 2011/06/22
ジャーナル フリーIn cast-in insert, thermal spraying with Ni base self-fluxing alloy improves the bonding state markedly. In this report, mild steel and stainless steel pipes were bonded to gray iron, and the solidification progress at the bonding interface was analyzed by a finite difference method to clarify the bonding process and the role of spraying. Diffusion of Ni was also calculated and compared with the measurements and the microstructures. The analysis showed that the solidification at the interface progresses in three ways, depending on the volume ratio of the insert and the melt : by gradual solidification, rapid solidification followed by remelting, and rapid solidification without remelting. Good bonding is possible with the two former, where the fused sprayed alloy between the steel and the solid liquid coexisting cast iron expands the critical region of solid fraction and contact period required for the good bonding. Agreement between calculated and measured Ni diffusion and the microstructures supported these bonding processes.抄録全体を表示PDF形式でダウンロード (816K) -
笹栗 信也, 松原 安宏, 大城 桂作1993 年 65 巻 4 号 p. 319-325
発行日: 1993/04/25
公開日: 2011/06/22
ジャーナル フリーTo clarify the bonding process of copper-brazed high chromium cast iron and mild steel, specimens were water-quenched during bonding, and bonded structure, distribution of alloys in bonded zone and quantitative analysis of base materials dissolved into molten copper were investigated. Both base materials begin to dissolve first into molten copper when bonding temperature rises up over the melting point of copper and the dissolution continues up to the solubility of solute atoms dissolved. Soon, the molten copper and γ phase come to a state of equilibrium at the interfaces of both base materials and copper. Since chemical potential of iron in the molten copper at cast iron side is lower than that at steel side, however, iron diffuses from the steel through molten copper to cast iron. In molten copper near cast iron, therefore, concentration of iron increases and constitutional supercooling occurs, and Fe-Cu-Cr-C alloy crystallizes in a rod-like shape. Once the alloy precipitates, iron concentration in the copper around it decreases. To make up for the shortage of iron, more dissolution of the steel takes place, and consequently the alloys continue to develop toward the steel.抄録全体を表示PDF形式でダウンロード (823K)
技術報告
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瀬川 俊男, 小野 俊雄, 長沢 宏章, 岐亦 博, 松田 政夫1993 年 65 巻 4 号 p. 326-331
発行日: 1993/04/25
公開日: 2015/01/21
ジャーナル フリーEight-ton liningless cupolas with 3 tuyers have brought long campaigns successfully as 2 shift 1 week by using cokes-banking technic. A cupola with a few number of tuyers bring about dead zones of combustion between every two tuyers inside of cupola shaft. Contrary, several advantage are expected as follows: (1) Reduction of deposits inside of the cupola wall. (2) Offering big working space for repair inside of the cupola. (3) Reduction of the opportunity of air blast interruption due to tuyer melting. The campaign results are summarized as follows: (1) Deposits on the tuyers and cupola wall are within 130kg (2) Heat loss ratio less than 4% can be maintained for the tuyers. (3) Influence of dead zones of combustion between every two tuyers were unremarkable.抄録全体を表示PDF形式でダウンロード (3397K) -
小椋 宏典, 那賀 博和1993 年 65 巻 4 号 p. 332-336
発行日: 1993/04/25
公開日: 2015/01/21
ジャーナル フリーPDF形式でダウンロード (2735K)
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