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Volume 26 (1992)
- Issue 53 Pages 1-
- Issue 52 Pages 1-
- Issue 51 Pages 1-
Volume 26, Issue 51
Displaying 1-4 of 4 articles from this issue
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Proposal of 2D Small Vibration Method and Scan-Flushing MethodXiao-Xin CUI, Takahisa MASUZAWA, Masatoshi FUJINO1992 Volume 26 Issue 51 Pages 1-12
Published: March 31, 1992
Released on J-STAGE: March 12, 2010
JOURNAL FREE ACCESSIn EDM diesinking, an excess of debris is often produced during machining in the gap between the electrodes, reducing the removal rate and damaging the machined surface. In order to remove these debris, various methods such as fluid injection, jet flushing, jump motion, planetary motion and self-flushig have been used or proposed. With these methods, problems such as navel removal and idle time exist. In this article, 2D small vibration method and scan-flushing method are proposed as new flushing methods to solve these problems. By using these methods, better machining efficiency and better surface accuracy can be obtained.View full abstractDownload PDF (8329K) -
3rd Report; Analysis of Detecting Characteristics of EDM Discharging PositionHaruki OBARA, Shunji ISHIBASHI, Tadaaki IOKA1992 Volume 26 Issue 51 Pages 13-27
Published: March 31, 1992
Released on J-STAGE: March 12, 2010
JOURNAL FREE ACCESSIn second report, we detected discharging position from discharging current or time differential current waves during WIRE EDM, and described some detecting characteristics.
These results shows that it is possible to detect discharging position with ±1 or ±2mm accuracy. Also detecting characteristic depends on discharging capacitance, gap voltage wave, wire diameter, and especially workpiece materials. From these results, it is considered that skin effect of electrode and workpiece is important to know the detecting characteristics.
In this report we analyze EDM discharging characteristics to detect EDM position considering skin effect of electrode and workpiece on vertical and WIRE EDM. From these results, we discuss about the detecting accuracy, factor of error, and a new detecting method of EDM position.View full abstractDownload PDF (1139K) -
Yoshiyuki UNO, Toshikatsu NAKAJIMA, Tsuyoshi YAMAGUCHI1992 Volume 26 Issue 51 Pages 28-38
Published: March 31, 1992
Released on J-STAGE: March 12, 2010
JOURNAL FREE ACCESSThe generation mechanism of surface roughness in electrical discharge machining is experimentally analyzed, investigating the shape of a crater generated by a single pulse discharge, the interference profile of two adjacent craters and so on. Then the relationship between the shape of a single crater and the surface roughness in electrical discharge machining is discussed. Main conclusions obtained in this study are as follows:
(1) The pile-up between two adjacent craters becomes maximum when the distance from a crater to another equals approximately to the diameter of a single crater.
(2) Surface roughness in electrical discharge machining with longer discharge duration becomes less than the conventional theoretical one, while surface roughness with shorter discharge duration is agreeable to the theoretical one.
(3) According to the frequency analysis of surface roughness curve in electrical discharge machining, the shapes of power spectra do not change for various discharge currents, while the power of shorter wave length becomes less for longer discharge duration as compared with that for shorter discharge duration.
(4) An experimental relation between the surface roughness in electrical discharge machining and the shape of a single crater is obtained.View full abstractDownload PDF (4094K) -
Proposal of a Model Represented by Electric CircuitMasamitsu TSUCHIYA, Tsutomu KANEKO, Yasuhiro ABE, Seiji SATO1992 Volume 26 Issue 51 Pages 39-49
Published: March 31, 1992
Released on J-STAGE: March 12, 2010
JOURNAL FREE ACCESSIn the diesinking EDM, the jump flushing is generally known to be useful to clean up the working gap. However, it is very difficult to adjust the jump parameters efficiently such as an amplitude and an execution timing of the jump motion with progress of machining. Because, in this process, optimal values of such parameters change widely with progress of machining and to adjust them an extensive expert knowledge about the jump control is required. Therefore, if a numerical equivalent model of the jump flushing EDM can be framed, it will be very useful for adaptive adjustment of the jump parameters.
This report describes a newly proposed equivalent model of the jump flushing EDM represented by an electrical way. Increasing process of the machining products in the working gap is converted to the charging process of a condenser in a DC electric circuit. Efficient jump timing is able to be computed from the rising time of the terminal voltage of the condenser to a threshold value which corresponds to critical density of the machining products for the safety sparking.
Results of computer simulations based on the proposed model show that the machining characteristics of the jump flushing EDM could be reproduced sufficiently except for the very early stage of machining. Besides, it was found that approximate optimal values of the jump parameters could be computed easily.View full abstractDownload PDF (849K)
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