精密工学会誌
Online ISSN : 1882-675X
Print ISSN : 0912-0289
ISSN-L : 0912-0289
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80 巻, 11 号
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特集　より速く！　そして安全に！　輸送インフラを支える精密計測技術
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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
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論文
  • アコースティックエミッション技術による切削工具の機上計測に関する基礎的研究
    —スクエアエンドミルによる接触検知の検討—
    古賀 俊彦, 長谷 亜蘭, 二宮 敬一, 和田 正毅, 三科 博司
    2014 年 80 巻 11 号 p. 1012-1017
    発行日: 2014/11/05
    公開日: 2014/11/05
    DOIhttps://doi.org/10.2493/jjspe.80.1012
    ジャーナル フリー
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    The machining accuracy of machine tools has improved and the instrumentation technology on the machine has also advanced by leaps and bounds. Contact measurements using a touch sensor and contactless measurements using a laser, etc. are used on the present manufacturing process. However, the detection of the edge of rotating tool using contact measurements is very difficult. Also, there arises a problem of the misdetection caused by the chip or stain that adheres to the cutting tool in contactless measurements. In this research, the detection of elastic stress waves caused when a rotating cutting tool contacted directly to a work material by using an acoustic emission (AE) technique was performed in order to solve these problems. The measurement of an exact tool position on machining becomes possible by using the AE technique. As a result of the experiments, the contact between the cutting tool and the workpiece was able to be detected by an accuracy of 0.1μm.
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  • 金属光造形複合加工法による通気特性を有する射出成形金型に関する研究
    是澤 宏之, 河野 匠司, 楢原 弘之, 鈴木 裕
    2014 年 80 巻 11 号 p. 1018-1022
    発行日: 2014/11/05
    公開日: 2014/11/05
    DOIhttps://doi.org/10.2493/jjspe.80.1018
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    It has been well known that molded defects of injection molding due to exhausting air from cavity can be reduced by permeable metal consisting of micro-structure. In this study, it is focused on that the micro-structure of injection mold is made from powder metal, and is manufactured by the Metal Laser Sintering with High Speed Milling in technology field of additives manufacturing. This paper deals with fabrication method for the structure with air permeability and evaluation for its properties. The first, we proposed a laser scanning path strategy which reduces fabrication defects. This strategy utilizes change of powder metal thermal conductivity which varied before and after sintering. The second, by using the strategy, a structure which consists of straight gas-exhausting tubes like a regular lattice with cubic elements is fabricated. Through fundamental experiments, the structure provides more amount of exhausted-gas and makes the amount have less variance. We confirmed the effectiveness of the proposed strategy, and identified a permeability coefficient of fabricated structure by experiments. The coefficient is expected to be incorporated in the mold design process.
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  • 低周波音響信号利用による微細穴検査技術
    —検査に使用する周波数と検査分解能の関係—
    長洲 慶典, 中山 昇, 伊東 一典, 大谷 真, 江口 穫正
    2014 年 80 巻 11 号 p. 1023-1030
    発行日: 2014/11/05
    公開日: 2014/11/05
    DOIhttps://doi.org/10.2493/jjspe.80.1023
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    This paper presents a method for non-destructive inspecting micro-holes with diameters of less than 100μm by using audible sound. Fluid flow through micro-holes affects the performance of a product. Therefore, if the flow rate of fluid passing through micro-holes could be accurately assessed by means of an inspection system, it would be possible to guarantee the performance of the product. By using a low frequency sound in micro-hole inspection, it is possible to measure the hole diameter differences of 1μm when hole diameter is 100μm. In addition, the experimental results show that, by setting the appropriate frequency, it is possible to measure faster than conventional inspection method.
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  • 微細エンドミル加工における加工状態のモニタリング
    野中 正和, 川合 忠雄
    2014 年 80 巻 11 号 p. 1031-1035
    発行日: 2014/11/05
    公開日: 2014/11/05
    DOIhttps://doi.org/10.2493/jjspe.80.1031
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    In the case of milling with micro end mill, cutting force, cutting sound and vibration are too small to detect tool breakage or abnormal cutting conditions. These were reasons why suitable measuring tool was not supplied until now. In previous papers, we have proposed a equipment to measure small cutting force acting on micro end mill in x-y plane. Deflection of a tool was captured by CCD camera and processed to measure cutting force.
    In this paper, our proposed equipment was applied to milling process with micro end mill to optimize cutting process and detect abnormal cutting condition. In optimization, relation between cutting force and cutting volume was formulated and optimization effect was verified by the proposed equipment. In detection of abnormal cutting condition, relation between tool wear and RMS value of cutting force was estimated.
    Finally, we optimized cutting condition and detected abnormal cutting condition very well.
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  • 工具すくい面におけるクラスターを考慮した摩耗粉生成モデルの提案
    西川 順之佑, 宋 小奇, 井原 透
    2014 年 80 巻 11 号 p. 1036-1040
    発行日: 2014/11/05
    公開日: 2014/11/05
    DOIhttps://doi.org/10.2493/jjspe.80.1036
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    Metal contact area is a severe environment during cutting. Therefore, wear mechanism is complex and it is difficult to be explained. In the past it has been proposed that predict approximately by diffusion. But it is not able to respond to range from low to high temperature. This study aims to propose a new crater high-cycle fatigue wear model depending on the tool adhesion model established by the surface cluster on the interface between the Tool-Work Piece. When the chip flows on the tool rake face, the discommensurate phase occurs in the surface cluster on the interface, and the surface cluster slides in the form of dislocation. At the same time, the chemical bonding between the cluster becomes the repeat force which can result in the fatigue failure on the tool, and the tool wear particle occurs. In this study, the mechanism of wear when the cemented carbide cut the carbon steel was investigated using the adhesion cluster model, and propose a wear mechanism corresponding to the temperature changes in a wide range.
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