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Improvement of ECM Characteristics by Applying Ultrasonic Vibration
Wataru Natsu,Hisashi Nakayama,Zuyuan Yu 한국정밀공학회 2012 International Journal of Precision Engineering and Vol. No.
In this study, a technique to remove the byproducts from the interelectrode area of an electrochemical machining (ECM)tool was investigated. Our goal was to improve both the processing speed and replicating accuracy of the ECM process. This technique involves the application of ultrasonic vibration to the tool electrode. The influence of the direction and the amplitude on the processing speed and the replicating accuracy was experimentally investigated. It was found that both the processing speed and the replicating accuracy had improved. In addition, the largest processing speed and the highest replicating accuracy were obtained by applying complex ultrasonic vibration. Next, an experimental hole was drilled to remove byproducts, via machining with tool feeding in the normal direction to the workpiece surface. In addition, we experimentally investigated the influence of the feed rate on the processing speed and the replicating accuracy. It was found that a higher feeding rate improved both the processing speed and the replicating accuracy.
Prediction of aspect ratio of a micro hole drilled by EDM
Li Jianzhong,Yin Guoqiang,Wang Cong,Guo Xuejie,Yu Zuyuan 대한기계학회 2013 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.27 No.1
Micro electrical discharge machining (EDM) has the ability to drill micro holes with high accuracy in metallic materials. The aspect ratio of a micro hole generated by micro EDM is usually higher than those by other processes such as etching, mechanical drilling, and laser. However, it was found that the drilling speed of micro EDM slows down and even stops when the aspect ratio of a micro hole reaches a certain value. To understand this phenomenon, a theoretical model is proposed based on the fluid mechanics and surface tension. Experiments under different machining conditions are carried out to verify this model. Experimental results agree with the theoretical values, which indicate the validity of the proposed model. The difference between the theoretical values and the real values might be caused by debris, temperature and rotating of electrode in the discharge gap, which are ignored in the model.