電気加工学会誌
Online ISSN : 1881-0888
Print ISSN : 0387-754X
ISSN-L : 0387-754X
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39 巻, 91 号
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研究
  • 走行ワイヤ工具の放電表面処理と複合加工への応用
    小菅 守, 毛利 尚武, 武沢 英樹, 古谷 克司
    2005 年 39 巻 91 号 p. 91_9-91_15
    発行日: 2005年
    公開日: 2006/06/09
    DOIhttps://doi.org/10.2526/jseme.39.91_9
    ジャーナル フリー
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    As industrial products become more diverse and higher in performance, more flexible machining systems are required. The purpose of this study is to develop a multifunctional system whose operation is based on the WEDM (wire electrical discharge machining) method. Since wires have long feeding paths that can readily be available for machining, wire characteristics can be manipulated by surface treatment on the paths. Therefore, by developing a multifunctional system using a wire with additional properties improved surface finishes in WEDM can be achieved. In this study, the basic machining method is WEDM as already mentioned. Grinding and surface treatment by EDM are additional methods that can make the system multifunctional. The following procedure was used: First, for the modification of a WED-machined surface, a wire coated with slurry containing titanium carbide powder suspended in glycerol was used to avoid mixing in hydrocarbon oil. Secondly, for grinding the WED-machined surface, the wire was surface-treated by accretion EDM with titanium green compact in hydrocarbon oil so that titanium carbide would be accreted on the surface. Therefore, it is possible to use different machining methods with the treated wire to improved WED-machined surfaces.
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  • 放電加工による高融点金属の炭化物形成
    塚原 秀和, 南 久, 増井 清徳, 曽根 匠
    2005 年 39 巻 91 号 p. 91_16-91_23
    発行日: 2005年
    公開日: 2006/06/09
    DOIhttps://doi.org/10.2526/jseme.39.91_16
    ジャーナル フリー
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    In this paper, we detail the formation of carbide layers on refractory metals, zirconium, hafnium, vanadium, niobium, tantalum, chromium, molybdenum and tungsten, using the electrical discharge machining (EDM) process. To form a carbide layer on a machined surface, a finishing EDM process with a scanning electrode was used. A carbide layer was formed on zirconium, hafnium, vanadium, niobium, tantalum, chromium, molybdenum, but not tungsten. These layers have many microcracks and pinholes, but some layers exhibit good tribologiocal properties. The ratio of carbon to matrix in the carbide layers was lower than that in debris. Carburization may occur at different rates in the surface layer and debris, and carbon reacted rapidly with debris. Therefore, to form a carbide layer with a high carbon ratio, it was necessary to decrease generation of the debris under the EDM condition that allowed to carburization.
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  • 焼結ダイヤモンドの微細放電加工
    中奥 洋, 増沢 隆久, 藤野 正俊
    2005 年 39 巻 91 号 p. 91_24-91_28
    発行日: 2005年
    公開日: 2006/06/09
    DOIhttps://doi.org/10.2526/jseme.39.91_24
    ジャーナル フリー
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    In this paper we describe the machining characteristics of sintered diamond processed by electrical discharge machining (EDM) for micromold fabrication. Experiments were carried out on four types of sintered diamond composed of 1-, 3-, 10- or 20-μm-diameter particles. Tungsten carbide alloy was also tested, for comparison. The basic parameters for EDM were determined by machining through-holes and trenches in workpiece plates. Although an unstable machining status was observed in some cases, sintered diamond has machining characteristics that are similar to those of tungsten carbide alloy for through-hole machining. Machined surfaces were observed in the machined trenches. The surfaces were found to be satisfactory for micromold application.
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