著者

坂本 満 秋山 茂 萩尾 剛 大城 桂作

出版者

Japan Foundry Engineering Society

雑誌

鋳造工学 (ISSN:13420429)

巻号頁・発行日

vol.69, no.3, pp.227-233, 1997-03-25 (Released:2011-02-01)

参考文献数

10

被引用文献数

13

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The oxide films formed on the molten Mg-Ca alloy were investigated by using an optical microscope, scanning electron microscope (SEM), X-ray diffraction and X-ray photoelectron spectroscopy (XPS) in order to elucidate the effect of Ca addition on the suppression of ignition and burning of the molten metal. While the pure Mg almost always ignited and burnt before melting down, the Ca addition increased the ignition temperature by about 250K, at which a very thin and uniform oxide film was formed on the molten Mg-5mass%Ca alloy, X-ray diffraction and XPS revealed that the oxide film on the Mg-5mass%Ca alloy consisted of two layers ; most upper layer of CaO and mixed layer of MgO-CaO under the CaO layer. The former was very thin and its thickness was independent of the exposure time at 973K in air, but the latter gradually grew with the exposure time. It appeared that the CaO film first formed depressed the volatilization of Mg and the permeation of oxygen gas, which made the molten alloy incombustible and manipulatable in air.

著者

望月 栄治 矢島 善次郎 岸 陽一 清水 謙一 吉田 敏樹

出版者

Japan Foundry Engineering Society

雑誌

鋳造工学 (ISSN:13420429)

巻号頁・発行日

vol.78, no.7, pp.345-350, 2006-07-25 (Released:2012-12-25)

参考文献数

9

被引用文献数

2

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The machinability of gray cast iron is well-knwn to depend on its graphite morphology and matrix structure. However, machinablility occasionally changes even if graphite morphology or matrix structure has not varied. We have therefore focused attention on seasoning and stress relief annealing known to improve machinability without changing the graphite morphology or matrix structure, and carried out machining tests and a series of ultrasonic transmission speed measurements, tensile test, hardness test and structure evaluation while varying the conditions for seasoning and stress relief annealing. As a result, it was found that seasoning applied specimens subject to seasoning greatly vary in machinability despite small changes in the ultrasonic transmission speed, tensile strength, and hardness. Furthermore correlation between ultrasonic transmission speed and amount of machining tool wear was seen in some parts of the stress-relief-annealed specimens with little changes in the optical microstructure and mechanical properties.

著者

髙橋 芳朗 清水 一道 足立 真彦 大城 桂作 片岸 庄史

出版者

Japan Foundry Engineering Society

雑誌

鋳造工学 (ISSN:13420429)

巻号頁・発行日

vol.75, no.3, pp.196-201, 2003-03-25 (Released:2011-02-01)

参考文献数

21

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Solidification structures and frictional wear characteristics of high P cast iron containing 3.3 mass%C, 1.7 mass%Si, 1.4 mass%Mn, 0.3-3.0 mass%P, 0.37 mass%Cr, 0.20 mass%V were examined with an image analyzer and original braking test machine. High P cast iron consists of steadite, eutectic cementite and flaky graphite distributed in pearlitic matrix. The addition of higher levels of P increases the steadite, which raises frictional wear resistance against the wheel steel.The wear resistance effectively improved with the addition of about 0.6 mass%P. The braking ability also improved with the addition of more than 1 mass%P at the initial braking speed of above 15 m/s. The contact surface was heated above 990 K at the initial braking speed of 25 m/s and the steadite partially melted or softened, which enhanced the braking ability of cast iron.

著者

菅野 利猛

出版者

Japan Foundry Engineering Society

雑誌

鋳造工学 (ISSN:13420429)

巻号頁・発行日

vol.78, no.1, pp.23-29, 2006-01-25 (Released:2012-12-25)

参考文献数

16

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Nirayama reverberatory furnace is located at lzunokuni-city of lzu-Peninsula, Shizuoka-Prefecture. Hagi reverberatory furnace exists at Hagi-city, Yamaguchi-Prefecture, but Nirayama's one is the only one architectures that could make cast iron cannon. There are still remained some unknown matters as follows ; (1) whether cast iron was really melted or not, (2) what kind of pig-iron was used, (3) whether blowing of bellows were utilized or not, (4) what kind of fuels were used, (5) where firebricks were made, etc. On this Nirayama reverberatory furnace, the possibility of casting of cannon with iron was investigated, with melting experiment from a foundry engineering standpoint.   The followings are presumed from the investigation. Firstly, at least three cannons of cast iron were manufactured. Secondly, high Silicon contained pig-iron could not be available, so casting of iron cannon was not well done. Finally, the melting time by reverberatory furnace, from preheating to pouring completion, was about eight hours and melting temperature was above 1623K.

著者

金子 淳 遠藤 彥美 鈴木 健治

出版者

Japan Foundry Engineering Society

雑誌

鋳物 (ISSN:00214396)

巻号頁・発行日

vol.24, no.4, pp.22-28, 1952

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We have troubled ourselves about the pinholes of steel castings cast in green sand moulds, so studied the cause of the pinholes and made them clear to be in the relation to hydrogen gas.</br>  We made efforts chiefly to examine the influeuces of green sand factors on the pinholes, casting the samples of molten steel in various conditions of green sand moulds. And after analysed hydrogen gas of the samples, we checked up the fractures of them whether there were pinholes or not.</br>  The results obtained are as follows.</br> 1) It's proved that the pinholes of green sand mould castings are caused by hydrogen gas when it is contented over 8 cc.⁄100 gr. in the cast samples.</br> 2) When the clay % of green sand is 12% and moisture % is varried from 5% to 8%, hydrogen gas in cast samples increases with the increase of moisture, and the increased amounts are under 2 cc.⁄100 gr.</br> 3) When the moisture of green sand is 5% or 7%, and clay % is varried from 11% to 17%, hydrogen gas is most contented in the samples at about 15% of clay.</br> 4) Hydrogen gas shows some increases with the decrease of permeability from 400 to 140 A. F. A.</br> 5) The relation among moisture, clay and pinholes is cleared, and 5% moisture and 12% clay of green sand are standard % in order to get sound steel castings.</br> 6) The samples cast in green sand moulds are (3 c.c. ⁄ 100 gr hydrogen gas) more rich than samples cast in a copper mould from a ladle. Therefore the hydrogen gas in molten steel just before tapping must be kept under 4 c.c. ⁄ 100 gr, considering the increase of 1 c.c. ⁄ 100 gr during the interval from the furnace to the ladle.

著者

山根 清一

出版者

Japan Foundry Engineering Society

雑誌

鋳物 (ISSN:00214396)

巻号頁・発行日

vol.13, no.1, pp.7-10, 1941

著者

菅野 利猛 丸山 善久

出版者

Japan Foundry Engineering Society

雑誌

鋳造工学 (ISSN:13420429)

巻号頁・発行日

vol.77, no.12, pp.833-840, 2005-12-25 (Released:2011-02-01)

参考文献数

29

被引用文献数

1

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Since cast iron is a compound material of steel and graphite, its mechanical properties change according to the amount, form and distribution of the graphite. In this paper, the effects of graphite on the mechanical properties were kept constant. That is, the eutectic graphitization ability (EGA) in gray cast iron was limited to approximately 50%, and in the case of spheroidal graphite cast iron, the nodularity was maintained above 80%.  This paper presents a method of determining the mechanical properties from the hardness. First, the relationship between hardness and tensile strength was established and then the relationship between tensile strength and various mechanical properties was determined. From the data thus obtained it was possible to determine the various mechanical properties only from the hardness.

著者

ランバート ガイ 内藤 雅元

出版者

Japan Foundry Engineering Society

雑誌

鋳造工学 = Journal of Japan Foundry Engineering Society (ISSN:13420429)

巻号頁・発行日

vol.71, no.5, pp.354-360, 1999-05

著者

松浦 誠 片島 三朗

出版者

Japan Foundry Engineering Society

雑誌

鋳物 (ISSN:00214396)

巻号頁・発行日

vol.54, no.10, pp.675-680, 1982

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The effect of the jolt impact on the compaction of molding sand was investigated by measuring the acceleraion of the jolt table at the impact of jolting using a piezo-electric accelerometer. The mold density is directly influenced by the condition of the impact acting on the jolt table. The average mold density becomes higher as the magnitude of acceleration and the duration of impact of the jolt table increase. The acceleration inside the mold during jolting was also examined and it's behavior was anaslyzed in relation to the compaction process of molding sand. Further, experiments on the sand flow and mold density distribution in the mold were carried out. The mechanism of jolt compaction of molding sand is discussed.

著者

小林 秀章 高橋 智徳 蒲野 良雄

出版者

Japan Foundry Engineering Society

雑誌

鋳造工学 = Journal of Japan Foundry Engineering Society (ISSN:13420429)

巻号頁・発行日

vol.81, no.12, pp.674-677, 2009-12-25

著者

牧 正志

出版者

Japan Foundry Engineering Society

雑誌

鋳物 (ISSN:00214396)

巻号頁・発行日

vol.65, no.5, pp.420-425, 1993