精密工学会誌
Online ISSN : 1882-675X
Print ISSN : 0912-0289
ISSN-L : 0912-0289
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78 巻, 9 号
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特集　多軸・複合・高機能・超精密加工機および関連技術の最前線
展望
解説
私の歩んできた道
グラビアとインタビュー　精密工学の最前線
はじめての精密工学
研究所・研究室紹介
 
論文
  • アルミニウム合金の旋削加工におけるDLC膜とアルコールミストの組み合わせの効果
    横田 知宏, 澤 武一, 横内 正洋
    2012 年 78 巻 9 号 p. 777-781
    発行日: 2012/09/05
    公開日: 2013/03/05
    DOIhttps://doi.org/10.2493/jjspe.78.777
    ジャーナル フリー
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    In order to develop an environmentally-friendly cutting technology by oil-free mist lubrication, the cutting performance of the combination of Diamond-Like Carbon (DLC) coated tool and alcohol mist lubrication was evaluated. The cutting experiments of the aluminum alloy (AC2A) were conducted with a lathe. The result showed that the cutting force was reduced and the aluminum adhesion width on the tool was small using the DLC (ta-C) coated tool and isopropyl alcohol (IPA) mist. Especially at the low cutting speed (50 m/min), the cutting force and the adhesion width were comparable to those values at cutting in the wet condition. This was caused by the low frictional condition of the tool surface. Therefore, it is found that the environmentally-friendly cutting technology for the aluminum alloys is promising by the combination of the DLC coated tool and alcohol mist lubrication.
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  • 静水圧環境下におけるシリコンゴムの切削に関する実験的研究
    釣本 聖司, 森脇 俊道
    2012 年 78 巻 9 号 p. 782-786
    発行日: 2012/09/05
    公開日: 2013/03/05
    DOIhttps://doi.org/10.2493/jjspe.78.782
    ジャーナル フリー
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    It is generally difficult to shape rubbers by conventional cutting methods as they deform largely before cutting. A new method is proposed in the present paper to drill silicon rubber by applying the hydrostatic pressure to suppress the elastic deformation. It is experimentally shown that the soft silicon rubber can be well drilled with the aid of the hydrostatic pressure device to apply the hydrostatic pressure to the silicon rubber work. The surface roughness of the drilled hole is much improved by applying the hydrostatic pressure over 1MPa.
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  • Ca脱酸鋼における酸化物系介在物とBelagの微細組織
    渡里 宏二, 藤原 順介, 西 隆之, 江頭 誠
    2012 年 78 巻 9 号 p. 787-791
    発行日: 2012/09/05
    公開日: 2013/03/05
    DOIhttps://doi.org/10.2493/jjspe.78.787
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    The effect of improving machinability of Ca-deoxidized steel in carbide tool machining operation has been widely known. It has been proposed that oxide inclusions, which would work as “Belag” on the tool surface during machining operation, in steels has been responsible for this improvement effect. In this study, the micro structure of oxide inclusion in Ca-deoxidized steel and Belag formed during turning was analyzed using transmission electron microscopy (TEM) analysis. Oxide inclusions and Belag were identified crystalline gehlenite using TEM. By synthesized oxide similar component of Ca-deoxidized steel's inclusion, it was clarified that the hardness of gehlenite around 700°C was soften by transition from amorphous to crystalline phase at 1100°C heating. It was confirmed that Belag was formed on tool face easily because the crystalline oxide inclusion in Ca-deoxidized steel was soften appropriate hardness by cutting temperature rising during cutting process.
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  • 小径ボールエンドミルによるテーパ穴形状創成加工
    小野塚 英明, 河野 一平, 吉川 武尚, 帯川 利之
    2012 年 78 巻 9 号 p. 792-797
    発行日: 2012/09/05
    公開日: 2013/03/05
    DOIhttps://doi.org/10.2493/jjspe.78.792
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    This paper describes a method to machine tapered holes with slender ball end mills onto hardened steel for plastics molding dies. Tapered holes are usually finished with taper shaped ball end mills after the roughing with drills before hardening. But in order to eliminate the tool manufacturing period and machine time, direct cutting of hardened steel by helical feed milling with straight slender end mills was proposed. In this research, effects of feed direction on cutting tool life and machining accuracy was investigated. Experimental results revealed that tool life is longer in clock wise (CW) feed direction than in counter clock wise (CCW) direction although surface roughness is better in CCW. It was also found that the change of diameter of machined holes in CW direction is smaller than that in CCW direction because increase in cutting forces due to tool wear is smaller in CW direction than in CCW direction.
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  • 持続可能な製造業の実現に向けた持続可能社会シナリオシミュレータの開発 (第3報)
    —フォアキャスティング型シナリオ設計支援手法—
    水野 有智, 木下 裕介, 和田 春菜, 福重 真一, 梅田 靖
    2012 年 78 巻 9 号 p. 798-804
    発行日: 2012/09/05
    公開日: 2013/03/05
    DOIhttps://doi.org/10.2493/jjspe.78.798
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    Developing scenarios is a hopeful approach for drawing visions and pathways of sustainable manufacturing toward sustainable society. Sustainable Society Scenario (3S) Simulator is an integrated design support environment that supports understanding, describing, and analyzing scenarios. This paper proposes a design support method of scenarios in 3S Simulator. Proposed method supports designing scenarios in forecasting manner, in which futures are explored starting from the present. We employ two-leveled causal networks for supporting scenario design in structuring ideas and describing the structured ideas into a scenario, by expressing the structure of the object world of the scenario. In the case study, we verified that the outlines and details of a scenario are deployed from the causal networks. Using 3S Simulator, the relationship between the causal networks and the descriptions of a scenario is clarified. This supports a designer to understand the scenario rationally. As the conclusion, proposed method supports designing scenarios in forecasting manner.
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  • 基礎能力開発手法を用いたNew OJTシステムによる高度技能者教育
    早田 岳史, 清水 達也, 井原 透
    2012 年 78 巻 9 号 p. 805-809
    発行日: 2012/09/05
    公開日: 2013/03/05
    DOIhttps://doi.org/10.2493/jjspe.78.805
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    A support method for introducing skill education in individuals using New OJT system via remote e-learning has been developed. This method is proved to be effective for the education to raise workers' skill higher. However, it is not suitable for gaining fundamental knowledge, and the efficiency of acquisition of fundamental knowledge by a learner remains low. To increase this efficiency, we propose a new method that provides complimentary education for learners who do not have adequate fundamental knowledge. We predict a learner's fundamental knowledge from paper-based tests and operation data obtained from an NC machine using a Bayesian network. As the result of experiments, our system raised the efficiency of learner's acquirement of fundamental knowledge and high-level skills.
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  • デジタルスタイルデザインに関する研究
    —ハイライト曲線に基づく意匠曲面の構築—
    矢納 咲子, 青山 英樹
    2012 年 78 巻 9 号 p. 810-816
    発行日: 2012/09/05
    公開日: 2013/03/05
    DOIhttps://doi.org/10.2493/jjspe.78.810
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    Free form surfaces have been used for constructing appearance forms of industrial products. Although computer systems like CAD software have been developed, construction of a form by high quality surfaces is still not easy work. In the automobile industry, a designed car-form is evaluated by highlight lines. When a designed car-form does not present desired highlight liens on purpose, the re-designing process of the form is repeated. In this study, a method to automatically construct an aesthetic form based on highlight lines which can be interactively given by designer was proposed. In addition, the fundamental system based on the method was developed and its validity was confirmed by simple tests.
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  • 圧入組立構造の分割鉄心を用いたモータ生産工法の開発 (第1報)
    —燃料ポンプ用DCモータの小型軽量化—
    山本 一之, 坂井 雄作, 佐武 英和, 宮崎 文夫
    2012 年 78 巻 9 号 p. 817-822
    発行日: 2012/09/05
    公開日: 2013/03/05
    DOIhttps://doi.org/10.2493/jjspe.78.817
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    This paper presents the motor manufacturing technology for DC motors which are used for such products as motor vehicles, information machines and equipment, etc.The novel manufacturing technology called Slide-type divided cores has been developed and applied to a DC motor which is used for fuel pump of automobile. Characteristic points of this technology are as follows. (1) One of circular staked cores is slid out in radial direction, as a result, coil winding space is extended and high coil occupancy is achieved. (2) As a stator is assembled by fitting a shaft into a center hole of divided cores, welding process becomes unnecessary. Using this manufacturing technology, the size and weight are reduced more than 40% compared to conventional motors.
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