著者

錦織 清治

出版者

大同特殊鋼株式会社

雑誌

電気製鋼 (ISSN:00118389)

巻号頁・発行日

vol.21, no.1, pp.2-17, 1950-01-30 (Released:2009-05-25)

著者

岩瀬 正則

出版者

大同特殊鋼株式会社

雑誌

電気製鋼 (ISSN:00118389)

巻号頁・発行日

vol.66, no.1, pp.20-26, 1995-01-15 (Released:2009-05-25)

参考文献数

4

---

In 1992, the ratio of electric-furnace steel to the total crude steel production has increased to approximately 30% in Japan. Because of a number of advantages of EAF in comparison with BOF, an increasing trend in the production of EAF-steel would still continue even into the next century.In terms of steel specifications and product quality, however, EAF-steel has not been without problems. Currently, the EAF-steelmakers produce primarily bars and structrual shapes, while thin plate or sheet steel cannot be made via EAF. Because of such restrictions, in the near future, i.e., between 2005 and 2015, it is highly anticipated that approximately 15 millions tons of scrap may not be utilized as a source for EAF-steelmaking, resulting in serious problems with respect to environmental and health considerations within Japan's local community.In this article, a critical review is given to (1) current research activities with respect to the removal of copper, which impairs the production of sheet steel by EAF, (2) future trend in the recycling of ferrous scrap with a particular emphasis on shredded scrap, which is generated from used automobiles, and (3) long-term strategies for maintaining better partnership between Japan and foreign countries, especially U.S.A.A brief summary on the author's new process for copper removal from solid ferrous scrap by using molten aluminium is also given.

著者

宮道 知典

出版者

大同特殊鋼株式会社

雑誌

電気製鋼 (ISSN:00118389)

巻号頁・発行日

vol.78, no.2, pp.141-147, 2007-04-26 (Released:2007-10-26)

参考文献数

9

被引用文献数

4 3

---

Aluminum alloy material is used for a lot of railroad cars such as SHINKANSEN and the commuting train. The carbody is composed A6N01S extrusion of aluminum alloy material and manufactured with MIG welding process. New joining process "Friction Stir Welding (FSW)" is developed in TWI in 1991. Because FSW is a low heat input process compared with MIG welding, the distortion of welding joint can be reduced. With using the advantage of FSW, the application is started in 1998. The first application is joining parts of carbody side-panel. After the hollow shape extrusion is developed, FSW has extended to the primary parts of the carbody structure, such as roof-panel, side-panel and floor-panel. About ten years pass from the first application FSW is becoming the main joining process of the aluminum alloy carbody.

著者

山口 孝夫 岩田 英敏

出版者

大同特殊鋼株式会社

雑誌

電気製鋼 (ISSN:00118389)

巻号頁・発行日

vol.75, no.4, pp.297-303, 2004-10-15 (Released:2010-06-02)

参考文献数

9

---

In recent years, SQUID (superconducting quantum interference device) technology has been developed for measuring the very low magnetic field generated from a human's physiology activity, and this technology is used for MEG (magnetencephalograph) and MCG (magnetcardiograph). In this way, the MEG and MCG have begun to be installed to the some hospitals as the medical devices. It is necessary to reduce the environmental magnetic field significantly, in order to measure the weak signals with high stability by using these devices. We developed and manufactured the magnetic shielding room for this purpose. In this paper, shielding performance of the magnetic shielding room at the low intensity and low frequency magnetic field is introduced.

著者

柳原 和夫 河野 正道

出版者

大同特殊鋼株式会社

雑誌

電気製鋼 (ISSN:00118389)

巻号頁・発行日

vol.63, no.2, pp.109-118, 1992-04-15 (Released:2009-05-25)

参考文献数

2

---

The tribological conditions between tools and work pieces on cold/warm forging of steels are very severe because of high contacting pressure, high temperature, and large surface extension of work pieces. Therefore, many lubricants and estimating methods have been developed. But even using these methods, it's difficult to estimate that lubricants have a good effect on production or not.We have estimated many lubricants by ring compression and spike forging test to find new coating which is substitutes for conventional one such as Zn-phosphate and Na-stearate coating or oxalate and resin coating on cold/warm forging of steels.We selected some lubricants by spike forging test which gave large extension to work pieces and agreed with the result of backward extrusion qualitativly, and further evaluated the lubricants by heading test and mass production test of bolts by multi stage cold bolts former.As a result of tests, we found the new coating method which was over coated by Ca-stearate with MoS2 or Ca-hydroxide with PTFE on the inorganic salts precoating such as K2SO4 or Na2B4O7·5H2O.

著者

加藤 哲男 窪野 岳 水野 正志

出版者

大同特殊鋼株式会社

雑誌

電気製鋼 (ISSN:00118389)

巻号頁・発行日

vol.67, no.3, pp.187-192, 2000-03-27 (Released:2000-03-27)

参考文献数

9

被引用文献数

1

---

A unipolar induction apparatus was fabricated for an experiment in which a metal conductor was rotated in a magnetic field applied by a pair of magnets, and the induced voltage between the outside of the metal conductor and the rotation axis was measured. A phenomenon was recognized whereby a voltage was induced when only the metal conductor were rotated, but was not fully induced when only the magnets was rotated. Similar experiments were performed for two polar magnets. An alternating trapezoid voltage and a direct voltage were respectively induced when all the parts were rotated together and when only the metal conductor was rotated. An induced alternating voltage with a nearly sinusoidal wave was observed when only the magnets were rotated. It seems likely that this phenomenon could be used in a new sensor for the

著者

百目鬼 英雄

出版者

大同特殊鋼株式会社

雑誌

電気製鋼 (ISSN:00118389)

巻号頁・発行日

vol.79, no.2, pp.135-141, 2008-02-28 (Released:2008-10-25)

参考文献数

3

---

Application of PM motor has spread from the demand of energy saving by a global warming issue. A SPM motor and the IPM motor of PM motor are typical kinds. This description explains that feature about two motors. The SPM motor explained the winding technology for realizing high efficiency, and the technology of reducing a torque ripple. An IPM motor explains work of reluctance torque and the expansion effect of the control range.

著者

井ノ口 貴之

出版者

大同特殊鋼株式会社

雑誌

電気製鋼 (ISSN:00118389)

巻号頁・発行日

vol.78, no.4, pp.361-368, 2007-11-29 (Released:2008-05-29)

参考文献数

5

---

Mirror polishability is one of the most important properties of the plastic injection mold for making transparent or mirror surface products. Mirror surfaces are to be free from pinholes and undulation. Pinhole is a kind of small pit which appears during polishing process. Although the effects of metallurgical factors such as microstructure, hardness, cleanliness on pinhole susceptibility have been studied, the actual forming mechanism of pinholes has not been fully clarified. To make it clear this mechanism current injection mold steels have been studied by observing actually polished surfaces with gradually refining polishing media. The results obtained are as follows. (1) Soft non-metaric inclusions such as sulfides cause pinholes by beeing ground preferentially. Hard particles:nitrides, oxides and carbides, on the other hand, form pinholes by dropping themselves off. (2) Pinhole shape depends on the type of particles. Shallow and wide for soft inclusions and deep and narrow for hard patricles. (3) In case of large polishing grits, pinholes hardly appear whether they are in the manner of preferential grinding or peeling off. Small grits, however, increases the number of pinholes. (4) When grit size is close to those of particles, hard inclusions and carbides tend to drop off easily. (5) When hard inclusions are distributed together with soft ones, they drop off easier than solely distributed.

著者

武田 喜三

出版者

大同特殊鋼株式会社

雑誌

電気製鋼 (ISSN:00118389)

巻号頁・発行日

vol.50, no.1, pp.8-14, 1979-01-15 (Released:2009-06-16)

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Transition of crude steel production in major countries. Change in world's steelmaking process. Increase of converter and electric arc furnace capacity in Japan.Transition of special steel production in major countries and prospect in the future.

著者

田中 貢 藤井 清一

出版者

大同特殊鋼株式会社

雑誌

電気製鋼 (ISSN:00118389)

巻号頁・発行日

vol.29, no.2, pp.107-113, 1958-03-30 (Released:2009-05-25)

被引用文献数

1 1

著者

平竹 進 中西 洋一 山田 博之 吉田 浩二

出版者

大同特殊鋼株式会社

雑誌

電気製鋼 (ISSN:00118389)

巻号頁・発行日

vol.55, no.1, pp.74-81, 1984

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An industrial scale new melting process, named Plasma Progressive Casting Furnace (PPC-F) was designed and constructed by Daido Steel Co., in Daido's Hoshizaki Plant. This process is suitable for making a titanium primary ingot (VAR electrode) directly from grain sponge and/or various shapes of scraps without requirement for compaction and electrode fabrication. The furnace has six plasma torches circling around the water cooled crucible. Plasma arcs are controlled by magnetic field which also makes molten pool rotate. Materials are fed and melted continuously and solidified ingot is withdrawn progressively.<br>This process has a distinctive advantage of efficient utilization of small sized scraps which is difficult to remelt in usual VAR process and a high reduction of the melting cost is accordingly expected.

著者

草加 勝司 清水 孝純 洞田 亮 中村 清 大河内 敬雄

出版者

大同特殊鋼株式会社

雑誌

電気製鋼 (ISSN:00118389)

巻号頁・発行日

vol.62, no.2, pp.89-96, 1991-05-01 (Released:2009-05-25)

参考文献数

11

被引用文献数

2 1

---

The electronics industry has been abruptly advanced in recent years. On interconnecting microelectronics components with circuit board, solder paste has been used for surface mounted devices to achieve the extreme fineness of the detail of the assemblage.The more complex the surface mounting, the finer solder powder is needed for the paste. On the other hand the finer powder is more easily surface-oxidized. Because surface oxidation of powder prevent sound soldering, finer powder of specific particle size (40 micron under) is usually removed by classification. On considering productivity, it is necessary that solder powder should have particle size in the same range as possible on atomization.In this parper, an investigation has been made of relationship between centrifugal atomization conditions of eutectic solder and its morphologies. The results are summarized below.(1) As atomization disk revolution rate is lowered, particle size distribution becomes narrower.(2) As atomization disk diameter is smaller, particle size distribution becomes narrower.(3) Atomization disk is water-cooled and then particle size distribution becomes narrower.

著者

浅田 千秋

出版者

大同特殊鋼株式会社

雑誌

電気製鋼 (ISSN:00118389)

巻号頁・発行日

vol.25, no.5, pp.269-274,268, 1954-09-30 (Released:2009-05-25)

著者

稲垣 修一

出版者

大同特殊鋼株式会社

雑誌

電気製鋼 (ISSN:00118389)

巻号頁・発行日

vol.35, no.4, pp.192-195, 1964-07-31 (Released:2009-05-25)

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(a) シュウ酸電解エッチング試験は,この推薦案に示す標準沸騰硝酸試験では試片の腐食速度が小さく,また,そろっているか否かを推定するのに使用して差し支えない。これは,標準硝酸試験のみと併用するが,シュウ酸エッチング試験は,試験片の分類の基準として単独に用いて不十分なことはない。この腐食試験法で検定した材料に,沸騰硝酸試験を実施しなくてよい。この腐食試験で不合格となった材料には,却下する前に沸騰硝酸試験を実施しなければならない。(b) シュウ酸試験を適用し得るステンレス鋼の型は次の通りである。AISI 304, AISI 316, AISI 304L(センシタイズ状態で試験8)ACI CF-8 ACI CF-8MおよびCN-7MAISI 321, 347または316L型鋼には適用できない。したがって316型鋼を評価するときには,炭素量は0.03%以下でなければならない。

著者

長谷川 正義

出版者

大同特殊鋼株式会社

雑誌

電気製鋼 (ISSN:00118389)

巻号頁・発行日

vol.40, no.2, pp.93-106, 1969-04-15 (Released:2009-05-25)

参考文献数

30

著者

古橋 治義 曽根 定家 志知 営一

出版者

大同特殊鋼株式会社

雑誌

電気製鋼 (ISSN:00118389)

巻号頁・発行日

vol.39, no.1, pp.16-32, 1968

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数年前米国に端を発したアーク炉生産性向上の手段としての超大電力(Ultra High Power; UHP)操業がわが国においても最近注目されてきた。この機会にUHPに関して,アークの挙動,アーク炉の電気特性,不平衡回路の取扱い,炉の生産性,フリッカなど,アーク炉全般について,電気的見地から最近の技術的傾向をまとめた。近年アーク現象の解析は高速度カラー映画の導入で急速に進み,いっぽう,アーク炉三相不平衡回路の解析も計算機技術の助けによって大きな進展を約束されている。これらの新しい技術に基づいたアーク炉研究の一端として,アークからの伝熱,不平衡回路の解析,生産性の向上などに関して新しい提案を試みた。また,大電力投入に伴って,ますます表面化するであろう炉壁のホットスポットの問題に対してもいろいろの指針を提起した。さらに,アーク炉フリッカの問題については一船的な説明を述べると共に,UHP時に予想される方向を示唆した。

著者

加藤 哲男 富岡 達也

出版者

大同特殊鋼株式会社

雑誌

電気製鋼 (ISSN:00118389)

巻号頁・発行日

vol.36, no.3, pp.107-115, 1965-05-30 (Released:2009-06-16)

被引用文献数

1

著者

水野 正志 小島 勝洋

出版者

大同特殊鋼株式会社

雑誌

電気製鋼 (ISSN:00118389)

巻号頁・発行日

vol.62, no.3, pp.167-174, 1991

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It is important to measure the torque directly for watching or controlling the torque of rotary driving system. Though various types of torque sensors were developed, most of them were designed and manufactured for experiments and were not suitable for in-line use. A new magnetostrictive torque sensor which has the advantages of compact size, light weight and high durability, then is suitable for in-line use, was developed by using the structural steel shaft. This paper presents the optimization of measuring system of this torque sensor, which was one of the important parts as well as development of the materials for sensor shaft.

著者

河田 一喜

出版者

大同特殊鋼株式会社

雑誌

電気製鋼 (ISSN:00118389)

巻号頁・発行日

vol.76, no.4, pp.269-277, 2005-11-15 (Released:2010-04-19)

参考文献数

7

被引用文献数

1 4

---

The trend of recent surface treatment technology is reviewed. Various kinds of hard coating processes such as TRD, CVD, PVD and PCVD have been applied to dies and molds. As a recent trend of the surface treatment technology for dies and molds, a low-temperature process has been desired from a viewpoint of deformation and change in dimension, and a coating process for dies and molds of complicated geometry has become important. Furthermore, the duplex process (diffusion-hardening treatment + hard coating) has been used for prolongation of dies and molds lives. The PCVD process has good film adhesion and good throwing power at low temperatures, and it can perform the duplex process continuously. Consequently, the PCVD process has been widely applied to dies and molds. It is expected that the nano-composite films of TiAlSiCNO system and the DLC films by the PCVD realize lubricant-free cold pressing and cold forging and lubricant-less warm and hot working.

著者

加瀬 勉

出版者

大同特殊鋼株式会社

雑誌

電気製鋼 (ISSN:00118389)

巻号頁・発行日

vol.9, no.6, pp.230-240, 1933-06-15 (Released:2009-05-25)

参考文献数

1