Journal of The Japan Society of Electrical Machining Engineers
Online ISSN : 1881-0888
Print ISSN : 0387-754X
ISSN-L : 0387-754X
Volume 38, Issue 87
Displaying 1-7 of 7 articles from this issue
  • Yozo SAKAI, Nobuaki OOBA, Hajime OGAWA, Osamu YASUDA, Hidetaka KATOUGI
    2004 Volume 38 Issue 87 Pages 7-11
    Published: March 26, 2004
    Released on J-STAGE: March 12, 2010
    JOURNAL FREE ACCESS
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  • Tadashi IGARASHI
    2004 Volume 38 Issue 87 Pages 12-15
    Published: March 26, 2004
    Released on J-STAGE: March 12, 2010
    JOURNAL FREE ACCESS
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  • Tatsushi SATO, Jun-ichi SHIBATA
    2004 Volume 38 Issue 87 Pages 16-23
    Published: March 26, 2004
    Released on J-STAGE: March 12, 2010
    JOURNAL FREE ACCESS
    In this paper, we describe a method for controlling the entrance mark upon WEDM. The entrance mark, which causes a critical error in the superfine machining, is a tiny hollow space generated on the interface between the approach and the machining path. The main cause of the mark was determined to be the reduction of the machined volume during exiting of the wire electrode from the machining path to the approach. A method for reducing the mark using of time control based on the volume model is proposed. The accuracy of this method can be further improved by considering the change in the wire vibration caused by the off-time control. The improved method can not only reduce the mark but also control the shape of the mark from concave to convex.
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  • Hidekazu TSUKAHARA, Hisashi MINAMI, Kiyonori MASUI, Takumi SONE, Kei D ...
    2004 Volume 38 Issue 87 Pages 24-30
    Published: March 26, 2004
    Released on J-STAGE: March 12, 2010
    JOURNAL FREE ACCESS
    In this paper, we describe the tribological properties of the carbonization layer of titanium using EDM process. Modified layer under optimum conditions had a high carbon content and had an amorphous carbon area at the crater circumference. By using this method, a TiC layer with excellent tribological properties, low friction coefficient, minimal fluctuation and wear of mating material ball was obtained. This effect was suggested to influence amorphous carbon area of the extremely surface. The EDM process proved to be effective for the efficient surface modification of titanium.
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  • Fuzhu HAN, Masanori KUNIEDA, Hiroto ASANO
    2004 Volume 38 Issue 87 Pages 31-36
    Published: March 26, 2004
    Released on J-STAGE: March 12, 2010
    JOURNAL FREE ACCESS
    In this study, it was clarified that discharge locations can be controlled by locally superimposing high electric fields. On the basis of this principle, two methods for improving the controllability of discharge locations in wire electrical discharge machining (WEDM) were proposed: 1) increasing the local high electric field by increasing the superimposing voltage, and 2) increasing the discharge probability by successive superimposition in each discharge cycle. The experimental results showed that discharge locations in conventional dry WEDM can be dispersed uniformly over the workpiece surface, and the discharge can be successfully moved to the vicinity of the point where high voltage is applied.
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  • Hidekazu TSUKAHARA, Hisashi MINAMI, Seojoon LEE, Hideki HAGINO, Kiyono ...
    2004 Volume 38 Issue 87 Pages 37-42
    Published: March 26, 2004
    Released on J-STAGE: March 12, 2010
    JOURNAL FREE ACCESS
    In this paper, we examine the EDM process utilizing chemical reactions between organometallic compounds. The oxidization of the dielectric oil facilitates in proportion to working time. The reaction between organometallic compounds causes their transition from a hydrocarbon to a fatty acid containing carboxylic acid, etc. When an oxidized dielectric oil is used in EDM, the metal elements in the electrode and workpiece react to the oxidized oil and organometallic compounds are consequently formed. Several organometallic compounds are olephilic and dissolve in dielectric oil. This denotes that some of the debris from the electrode and/or workpiece metal are dissolved in the dielectric oil. This reaction is often observed as a change in the color of the dielectric oil, such as in the case of the organometallic compound iron, which becomes yellow. The reaction strongly influences the EDM process.
    Accordingly, by actively utilizing the reactions between organometallic compounds, some of the debris from the electrode and/or workpiece can be dissolved in dielectric oil. This would result in a decrease in debris and provide stability to the EDM process.
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  • Metal dies finishing technology using large area electron beam irradiation
    ZhanBo YU, Toyohisa SAKURAI, Masao MORIOKA
    2004 Volume 38 Issue 87 Pages 45-50
    Published: March 26, 2004
    Released on J-STAGE: March 12, 2010
    JOURNAL FREE ACCESS
    Download PDF (11022K)
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