著者

中江 秀雄

出版者

公益社団法人 日本鋳造工学会

雑誌

鋳造工学 (ISSN:13420429)

巻号頁・発行日

vol.85, no.8, pp.534-541, 2013-08-25 (Released:2018-01-01)

参考文献数

14

著者

堀川 紀孝 王 麟

出版者

公益社団法人 日本鋳造工学会

雑誌

鋳造工学 (ISSN:13420429)

巻号頁・発行日

vol.91, no.12, pp.850-855, 2019-12-25 (Released:2020-01-01)

参考文献数

13

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The microstructure and mechanical properties of ductile cast iron are affected by the chemical compositions and thickness of casting products. Thus, a nondestructive estimation method for casting is required. This research investigated effects of casting surface on the eddy current evaluation of ductile cast iron matrix. Ductile cast iron specimens having various microstructures were prepared by adding alloy elements and varying the thickness. One of the surfaces of the specimen was machined by face milling, and annealed after machining. Eddy current testing and microstructure observation were performed on both the machined surface and casting surface. Pearlite ratio showed good correlation with the eddy current signals measured on the machined surface. Similar correlation was obtained by measurement on the casting surface. However, the eddy current signal was affected by the casting surface. The influence of surface roughness and pearlite ratio on the eddy current signal differed according to the signal component. Selecting the signal components enables the effects of the surface roughness to be reduced. The effects of the testing frequency were also examined, and the results showed that the variation in the correlation between the eddy current and the pearlite ratio increased at lower and higher testing frequencies than 1 to 5kHz. Comparison of the correlations between the pearlite ratio and eddy current signals obtained by measurements on the machined surface and the casting surface showed that of the casting surface tends to have low pearlite ratio, due to the effects of the microstructure transient layer beneath the casting surface. Thus, it can be suggested that choosing a suitable testing frequency and an eddy current signal component enables the estimation of the matrix of ductile cast iron by eddy current testing regardless of the surface conditions.

著者

栗熊 勉 鬼頭 正博 秋田 憲宏

出版者

公益社団法人 日本鋳造工学会

雑誌

鋳造工学 (ISSN:13420429)

巻号頁・発行日

vol.71, no.2, pp.121-126, 1999-02-25 (Released:2014-12-18)

参考文献数

10

著者

西中 一仁

出版者

公益社団法人 日本鋳造工学会

雑誌

鋳造工学 (ISSN:13420429)

巻号頁・発行日

vol.76, no.6, pp.494-498, 2004-06-25 (Released:2015-01-10)

参考文献数

4

著者

真鍋 健一

出版者

公益社団法人 日本鋳造工学会

雑誌

鋳造工学 (ISSN:13420429)

巻号頁・発行日

vol.71, no.12, pp.811-817, 1999-12-25 (Released:2014-12-18)

参考文献数

15

著者

西 直美

出版者

公益社団法人 日本鋳造工学会

雑誌

鋳造工学 (ISSN:13420429)

巻号頁・発行日

vol.80, no.2, pp.120-126, 2008-02-25 (Released:2015-01-13)

参考文献数

11

著者

野口 徹 鴨田 秀一

出版者

公益社団法人 日本鋳造工学会

雑誌

鋳造工学 (ISSN:13420429)

巻号頁・発行日

vol.70, no.12, pp.920-927, 1998-12-25 (Released:2014-12-18)

参考文献数

15

被引用文献数

4

著者

飯島 伸介 中山 勝也 西村 育夫 霜田 浩 片桐 猛

出版者

公益社団法人 日本鋳造工学会

雑誌

鋳造工学 (ISSN:13420429)

巻号頁・発行日

vol.82, no.1, pp.29-37, 2010-01-25 (Released:2015-04-21)

参考文献数

27

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In the present work, a real plant of a regenerative thermal oxidizer (RTO) was applied to treat odor constituents from shell mould castings. As a result, it was found that concentrations of ammonia were about 20ppm, which is higher than that of other odor constituents in exhaust gas from shell mould castings. However, o- and p- cresol contained in the exhaust gas were found to highly contribute to offensive odor more than ammonia due to their low olfactory threshold, and the odor index of the exhausted gas was 40.   As a result of the treatment of the exhausted gas by the RTO, about 99.7% and 99.5% of the o- and p- cresol was decomposed, and the odor index of treated gas decreased from 40 to 21, which is lower than the regulation value in the offensive odor control act. Thus, it can be concluded that the RTO is suitable for decreasing odor constituents from shell mould castings.   The material balance of the RTO used for the real plant was calculated by using average values of operating data for 24hours. As a result, 92.4% of thermal efficiency was obtained, which results in higher energy savings than that of typical combustion processes.   In order to prevent tar adhesion which contributes to offensive odor and to the obstruction of regenerative heat exchanger in the RTO, a stainless filter and pre-heating system were introduced to the RTO. As a result, it was found that pressure loss of the RTO was almost the same as 1.8kPa for 400h. Subsequently, the regenerative heat exchanger was heated up to 623K by means of baking treatment, and it was found that tar was more or less completely removed from ceramic honeycombs in the regenerative heat exchanger.

著者

山田 隆介 戸田 裕之 竹内 晃久 ベーゼル 靖子

出版者

公益社団法人 日本鋳造工学会

雑誌

鋳造工学 (ISSN:13420429)

巻号頁・発行日

vol.89, no.1, pp.10-16, 2017

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<p>  A single-distance phase retrieval technique was applied to the contrast-enhanced phase-sensitive imaging of micro segregation in die-cast aluminum alloy. Contrast between regions with and without micro segregation, spatial resolution and signal-to-noise ratio were evaluated to clearly differentiate micro segregations whose density difference from the matrix aluminum is small, making it difficult to visualize and differentiate them using ordinary absorption-contrast imaging. Since spatial resolution more or less drops during the phase retrieval process, a combination of the high-contrast phase-contrast imaging and the high-resolution absorption-contrast imaging was applied to reveal 3D microstructure/fracture relationship in an in-situ tensile test. Each phase-contrast image was registered with a corresponding absorption-contrast image to examine the positional relationship between the fracture path and micro segregation. A sectioning technique was also applied to identify the source of density difference. The results confirmed that three-dimensionally connected bands of micro segregations provide a preferential path for fracture in the die-cast aluminum alloy investigated. The observations suggest that the control of the 3D spatial distribution of micro segregation bands is of crucial importance for enhancing mechanical properties effectively even if its elimination is physically difficult.</p>

著者

阿部 利彦 藤野 知樹 森 仁 中村 保彦 内一 哲哉 高木 敏行

出版者

公益社団法人 日本鋳造工学会

雑誌

鋳造工学 (ISSN:13420429)

巻号頁・発行日

vol.85, no.12, pp.895-899, 2013-12-25 (Released:2018-01-01)

参考文献数

11

著者

富澤 雅美 大門 弘典

出版者

公益社団法人 日本鋳造工学会

雑誌

鋳造工学 (ISSN:13420429)

巻号頁・発行日

vol.85, no.12, pp.900-905, 2013-12-25 (Released:2018-01-01)

参考文献数

14

著者

高柳 弘明 岡本 守

出版者

公益社団法人 日本鋳造工学会

雑誌

鋳造工学 (ISSN:13420429)

巻号頁・発行日

vol.69, no.12, pp.1050-1053, 1997-12-25 (Released:2014-12-18)

参考文献数

1

被引用文献数

1

著者

坂代 一郎

出版者

公益社団法人 日本鋳造工学会

雑誌

鋳造工学 (ISSN:13420429)

巻号頁・発行日

vol.85, no.12, pp.906-910, 2013-12-25 (Released:2018-01-01)

参考文献数

2

著者

中野 俊雄

出版者

公益社団法人 日本鋳造工学会

雑誌

鋳造工学 (ISSN:13420429)

巻号頁・発行日

vol.84, no.3, pp.165-169, 2012-03-25 (Released:2017-01-01)

参考文献数

13

著者

中村 孝

出版者

公益社団法人 日本鋳造工学会

雑誌

鋳造工学 (ISSN:13420429)

巻号頁・発行日

vol.79, no.2, pp.58-69, 2007-02-25 (Released:2015-01-13)

参考文献数

60

被引用文献数

1

著者

杉田 和彦

出版者

公益社団法人 日本鋳造工学会

雑誌

鋳造工学 (ISSN:13420429)

巻号頁・発行日

vol.71, no.12, pp.864-868, 1999-12-25 (Released:2014-12-18)

参考文献数

3

著者

中野 俊雄

出版者

公益社団法人 日本鋳造工学会

雑誌

鋳造工学 (ISSN:13420429)

巻号頁・発行日

vol.82, no.6, pp.380-387, 2010-06-25 (Released:2015-04-21)

参考文献数

24

著者

山田 銑一 塚原 茂男 大塚 英夫 廣崎 允位

出版者

公益社団法人 日本鋳造工学会

雑誌

鋳造工学 (ISSN:13420429)

巻号頁・発行日

vol.79, no.6, pp.291-296, 2007-06-25 (Released:2012-12-26)

参考文献数

9

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Soldering reactions are commonly observed during high pressure die casting of aluminum alloys, and involve the formation of interfacial compound between the die and cast alloy. However, discussions on the effects of composition of die steel on interfacial reaction have not been reported. In this report, reaction couples were formed between various alloy steel (SK5, SKD61, SKD11) and molten AD12. The following results were obtained,   SKD11 containing lower silicon content than that of SKD61 reduced the soldering reaction. The mass loss of SKD11 reduced than that of SKD61 in molten AD12. In molten AD12, intermetallic layer composed of Al, Fe and Si was formed in every steel. The intermetallic layer was composed of two layers; the inner layer had a lower silicon content and the outer layer a higher content.   In molten AD12, the intermetallic layer SKD61 was formed of compact and broken layers. On the other hand, SKD11 showed a compact layer and a slight broken layer, while SK5 showed a compact layer but no broken layer.

著者

及川 勝成 目黒 賢一 八百川 盾 安斎 浩一 山田 養司 藤原 彰人 吉井 大

出版者

公益社団法人 日本鋳造工学会

雑誌

鋳造工学 (ISSN:13420429)

巻号頁・発行日

vol.81, no.5, pp.232-237, 2009-05-25 (Released:2014-08-12)

参考文献数

14

被引用文献数

1

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Effects of mold temperature and injection pressure on mechanical properties and surface defects of Na2CO3-20mol%NaCl-30mol%KCl salt-mixtures made by high pressure die-casting machine were investigated. The bending strength of the salt-mixture was increased with increasing mold temperature, while the injection pressure in the temperature range from 39MPa to 78MPa was not influenced by the bending strength. Results of the Weibull statistics analysis suggest that increasing the mold temperature is effective for increasing the reliability of the strength as well as the bending strength, because the surface crack decreases with increasing mold temperature. In addition, we succeeded in making a salt core for single closed deck type cylinder blocks. These results suggest that the Na2C03-NaCl-KCl salt-mixtures made by die-casting machine are promising core material for aluminum alloy high pressure die-castings.