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Volume 31 (1997)
- Issue 68 Pages 1-
- Issue 67 Pages 1-
- Issue 66 Pages 1-
Volume 31, Issue 67
Displaying 1-3 of 3 articles from this issue
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Tatsushi SATO, Yoshihito IMAI, Akihiro GOTO, Takuji MAGARA, Akinobu TA ...1997 Volume 31 Issue 67 Pages 1-13
Published: July 31, 1997
Released on J-STAGE: March 12, 2010
JOURNAL FREE ACCESSEDM contouring is more advantageous in electrode cost and machining flexbility than the conventional diesinking EDM. Though the contouring had been thought to be less accurate due to the electrode wear, it was found that the contouring could achieve comparable accuracy with the conventional method by using the steady state of the electrode wear. This method allows more electrode wear than the conventional method because the electrode wear in the steady state does not decrease the machining accuracy as long as the wear is adequately compensated for. This means that this method may be also advantageous in machining speed, because the machining speed decreases in general when the electrode wear is made lower. In order to make this method practical, modeling the electrode wear is important. Once the model has been constructed, it may be easier to determine machining conditions such as the shape of the electrode and the compensation for the electrode wear for the desired shape of machining.
In this paper, a new grooving method using this contouring method is proposed. First, the electrode wear model at the steady state is described. Based on this model, the way to determine the machining conditions for grooves of any cross-sectional shape is described and some machining conditions for actual experiments are determined. The experimental results are found to be similar to the prediction given by the model when the grooves were not deep. Therefore, it can be concluded that this grooving method is practicable at least for the shallow grooves.View full abstractDownload PDF (4730K) -
Zuyuan YU, Takahisa MASUZAWA, Masatoshi FUJINO1997 Volume 31 Issue 67 Pages 14-22
Published: July 31, 1997
Released on J-STAGE: March 12, 2010
JOURNAL FREE ACCESSThis paper deals with the tool path design and error analysis for machining cavities with round cross section by cylindrical electrodes based on the uniform wear method. Conical cavities and spherical cavities were machined successfully by applying tool path generation based on the compensation equation for 3D Micro-EDM. In order to predict the dimensional errors caused in actual machining, the error equations of electrode wear ratio, machining area and electrode size have been derived from the compensation equation. Machined shapes of conical cavities and spherical cavities influenced by different errors were simulated.View full abstractDownload PDF (9232K) -
Yoshirou ADACHI, Masahiro YOSHIDA, Masanori KUNIEDA1997 Volume 31 Issue 67 Pages 23-30
Published: July 31, 1997
Released on J-STAGE: March 12, 2010
JOURNAL FREE ACCESSThis paper describes the process reaction force which is generated in EDM by the explosive expansion of a bubble due to evaporation and dissociation of the dielectric liquid. The reaction force influences on the machining accuracy because the position of the tool electrode is displaced under the reaction force. Thus in this research, the reaction force is calculated by integration not only the pressure inside the bubble but also the pressure in the dielectric liquid distributed over the working surface. We compared the calculated results with the reaction force measured in a single discharge and obtained the relationship between the reaction force and the machining conditions. Then we also measured the reaction force in a series of pulse discharges and obtained the following results: (1) The pressure distribution in the dielectric liquid in the working gap accounts for the most part of the reaction force. (2) Hence the reaction force is almost proportional to the area of the working surface. (3) The reaction force in a series of pulse discharges decreases with the lapse of time as the working gap is filled with the generated bubbles in place of the dielectric liquid.View full abstractDownload PDF (939K)
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