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      저자 : Wataru Natsu (검색결과 2 건)
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        Improvement of ECM Characteristics by Applying Ultrasonic Vibration

        Wataru Natsu,Hisashi Nakayama,Zuyuan Yu 한국정밀공학회 2012 International Journal of Precision Engineering and Vol. No.

        In this study, a technique to remove the byproducts from the interelectrode area of an electrochemical machining (ECM)tool was investigated. Our goal was to improve both the processing speed and replicating accuracy of the ECM process. This technique involves the application of ultrasonic vibration to the tool electrode. The influence of the direction and the amplitude on the processing speed and the replicating accuracy was experimentally investigated. It was found that both the processing speed and the replicating accuracy had improved. In addition, the largest processing speed and the highest replicating accuracy were obtained by applying complex ultrasonic vibration. Next, an experimental hole was drilled to remove byproducts, via machining with tool feeding in the normal direction to the workpiece surface. In addition, we experimentally investigated the influence of the feed rate on the processing speed and the replicating accuracy. It was found that a higher feeding rate improved both the processing speed and the replicating accuracy.

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        Electrochemical Machining of Tungsten Carbide Alloy Micro-pin with NaNO3 Solution

        Naoki Shibuya,Wataru Natsu,Yukihiro Ito 한국정밀공학회 2012 International Journal of Precision Engineering and Vol. No.

        In this study, the fabrication of micro-pins made of tungsten carbide (WC) alloy with the electrochemical machining (ECM) using a neutral electrolyte, NaNO3 aqueous solution, was proposed and the machining conditions were investigated. The micro-pin fabrication was carried out by changing the electrolyte concentration, the current value and the machining time. The effect of the by-product removal by means of ultrasonic washing was investigated experimentally. The micro-pin with the diameter about 20 μm, the length about 2 mm and the aspect ratio about 100 was obtained under the constant current 400 mA in a very short time of 2.5 min.

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