Comparison on gas bubble and pulse trains of deep-cavity electrical discharge machining with/without rotary ultrasonic assistance

  • Albert Wen-Jeng HsueEmail author
  • Tian-Jun Hao


Fundamental observation of bubbles and debris in deep-cavity electrical discharge machining (EDM) with an ultrasonic spindle aimed at achieving higher machining efficiency is proposed and compared. Various discharge pulse trains for EDM, rotary EDM (R-EDM), ultrasonic vibration-assisted EDM (UA-EDM), and rotary ultrasonic EDM (RU-EDM) are investigated. Their effects on the removal efficiency, machining stability, and the tool wear rate are studied as well. It is found that EDM in deep cavity is actually discharged in the gas bubble most of the time except the short period at the very beginning stage. The main bubble at EDM tool jumping is maintained with a constant volume. And, the volume results in the boundary height of the bubble at the next EDM stroke. In which, ultrasonic vibration of sufficient strength was found to split main bubble quickly and improve the material removal rate at about 49 % through much higher frequency of pulse trains. Appended with rotation, the rotary ultrasonic vibration EDM can improve the tool wear rate but reduces the MRR in compared with conventional EDM.


EDM Bubbles Debris Pulse trains MRR Rotary ultrasonic spindle 


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Compliance with ethical standards


1. This manuscript has not been published elsewhere nor has it been submitted for publication at the other journal.

2. Grammatical errors and writing style in the original version have been corrected by our colleague who is a native English speaker.

Conflict of interest

The authors declare that they have no conflicts of interest.

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Copyright information

© Springer-Verlag London 2016

Authors and Affiliations

  1. 1.Department of Mold and Die EngineeringNational Kaohsiung University of Applied SciencesSanmin DistrictTaiwan, Republic of China

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