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particularly needed for molds in which corrosive gases develop from plastic molding. Increased effectiveness against corrosion is particularly needed for molds in which corrosive gases develop from plastic compounds.
In this paper, in order to investigate the effective application of EDMing using a power additive in the plastic mold finishing process, surfaces by Powder Additive EDM were compared to those finished by conventional polishing.
*Equivalent model of jump flushing EDM (Ist Report) Proposal of a Model Represented by Electric Circuit
In die sinking 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 he 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 jumps 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 volgate 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.
Equivalent model of jump-flushing EDM (2nd Report) Influence of Duty Factor of working Pulse
This study aims to represent the characteristics of the jump-flushing EDM by a simple mathematical model in order to realize suitable selections of jump parameters through computer simulations. In the previous report, तुलसी प्रज्ञा जनवरी-मार्च, 2004
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