Shu Vidyut Sachit Teukay Che

SR No.: 005303
Original Sutra Author: N/A
Author: Mahendramuni
Publisher: Anekant Bharati Prakashan
Publication Year: 2005
Total Pages: 312
Language: Gujarati
Classification: Book_Gujarati
File Size: 13 MB

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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.
*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, we proposed a basic model from a consideration of similarity between the increasing process of machining products in the working gap and the charging process of a capacitance in the DC electrical circuit. As a result, that model showed validities to represent a change in machining characteristics and jump parameters with progression of machining. In the present report, we propose an expanded model in which influences of duty factor of working pulses are taken into consideration. Computer simulations based on the new model showed that suitable jump parameters and rest time of working pulse are able to be estimated. Further expansion of the model will be possible by considering influences of peak current or pulse duration in the similar way of the duty factor. *STUDY ON FLUSHING FOR EDM (1st Report), proposal of 2D Small Vibration Method and Scan-Flushing Method
In 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 this debris, various methods such as fluid injection, jet flushing, jump motion, planetary motion and selfflushing have been used or proposed. With there 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 obtaind.
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