Journal of The Japan Society of Electrical Machining Engineers

Application Technique of Cu-Be Alloy for Die and Mold

Masahiko HIHARA

2001 Volume 35 Issue 79 Pages 9-15
Published: July 30, 2001
Released on J-STAGE: March 12, 2010

DOIhttps://doi.org/10.2526/jseme.35.79_9

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Distribution of Discharge Location in EDM Using Chaos Theory

Fuzhu HAN, Masanori KUNIEDA

2001 Volume 35 Issue 79 Pages 16-23
Published: July 30, 2001
Released on J-STAGE: March 12, 2010

DOIhttps://doi.org/10.2526/jseme.35.79_16

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In this paper we describe the analysis of the distribution of discharge location using chaos theory in Electrical Discharge Machining (EDM). Chaos is a nonlinear phenomenon which is determined by a relatively simple rule, although it appears complicated and random. It was found that the discharge location is simply determined by the gap distribution and the debris particle distribution in spite of the complicacy and randomness of these distributions. Namely, the discharge occurs at the location where the gap is narrow and the debris density is high. Consequently, we analyzed the discharge location distribution using chaos theory and found the following: 1) the distribution of discharge location is irregular, 2) a bifurcation is observed, 3) the attractor dimension is relatively small, and 4) at least one of the Lyapunov exponents is larger than zero. By calculating the attractor dimension, we also found that there is a correlation between the attractor dimension and machining stability, that is, the higher the attractor dimension is, the greater the stability of machining is. This means the machining stability, which has not been detectable so far, can be distinguished by calculating the attractor dimension.

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Surface Modification of Titanium Using Scanning Electrode Method by Electro Discharge Machining

Hidekazu TSUKAHARA, Hisashi MINAMI, Kiyonori MASUI, Takumi SONE, Kei D ...

2001 Volume 35 Issue 79 Pages 24-31
Published: July 30, 2001
Released on J-STAGE: March 12, 2010

DOIhttps://doi.org/10.2526/jseme.35.79_24

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In this paper we present a surface modification method for titanium using a scanning electrode during the finishing process of EDM. The effects of several parameters, such as the electrode thickness, scanning speed and scanning pass, on the surface properties were investigated. Using this method, the discharge process can be controlled without any difficulty. Therefore a smooth TiC layer with excellent tribological properties may result. The C/Ti ratio in the TiC layer, which influences the tribological properties of the machined surface, changed with the discharge number. The scanning electrode method proved to be effective for efficient surface modification of titanium.

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Deep Microholes Machining by EDM

Application of Jump Flushing System

Dong-Yea SHEU, Takahisa MASUZAWA, Masatoshi FUJINO

2001 Volume 35 Issue 79 Pages 32-37
Published: July 30, 2001
Released on J-STAGE: March 12, 2010

DOIhttps://doi.org/10.2526/jseme.35.79_32

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Machining microholes with high aspect ratios has become important in various industrial fields. Since the development of WEDG (wire electro discharge grinding), micro-EDM has been an excellent process for machining microholes in metals and alloys. However problems remain in machining the high-aspect-ratio holes. As the depth of microholes becomes deeper, drilling through the microholes becomes more difficult. In addition, the removal of debris and renewal of dielectric from the machining gap are difficult because unstable discharge and arcing usually result. In this study, the jump flushing system is proposed for drilling microholes with high aspect ratios, by inducing an intermittent jump of the workpiece. The system is assisted by the horizontal main spindle and pure water dielectric. As a result, a 1.5mm-deep hole with the diameter of 100μm was successfully machined in to stainless steel which is one of the more difficult materials in which to drill deep microholes.

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Rapid Fabrication of Microtools by EDM

Application of Twin-WEDG Machining System

Dong-Yea SHEU, Takahisa MASUZAWA, Masatoshi FUJINO

2001 Volume 35 Issue 79 Pages 38-45
Published: July 30, 2001
Released on J-STAGE: March 12, 2010

DOIhttps://doi.org/10.2526/jseme.35.79_38

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Machining microholes with high aspect ratios has become important in various industrial fields. Using the jump-flushing system, it has become possible to machine deep microholes with a high aspect ratio of about 15 in stainless steel by EDM. It was previously necessary to fabricate a long microtool in order to machine deep microholes. WEDG is an excellent process for machining microtools with high precision, however, it takes a long time because if requires two processes, rough and finish machining. In this study, a new system is proposed for machining microtools quickly, by applying two WEDG units, one for rough machining and the other for finish machining. This twin-WEDG system can fabricate microtools by performing both processes at the same time. As a result, the twin-WEDG system is more efficient than the conventional WEDG system for fabricating microtools.

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Development of High Performance Wire Electrode for Wire Electric Discharge Machining

Seigi Aoyama

2001 Volume 35 Issue 79 Pages 46-51
Published: July 30, 2001
Released on J-STAGE: March 12, 2010

DOIhttps://doi.org/10.2526/jseme.35.79_46

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