Ultrasonic Vibration Assisted Micro Electrochemical Discharge Drilling Technology Electrochemical Discharge Machining (ECDM) is an effective way to fabricate micro holes, channels and kerfs on non conductive materials. In this paper, material removal mechanism of ECDM was discussed and model for gas film formation was established. Meanwhile, a series of experiments for micro drilling were carried out to demonstrate the advantages of Ultrasonic Vibration Assisted Electrochemical Discharge Machining (UAECDM). Results have shown that the machining voltage is significantly reduced while ultrasonic vibration is applied to the tool electrode, and both accuracy and stability of the machining process are improved consequently. Finally, 3 *3 array holes were fabricated with small thermal crack area around the inlet and no breakage at the outlet.

Artificial IntelligenceBased Hole Quality Prediction in MicroDrilling Using Multiple Sensors. The prevalence of microholes is widespread in mechanical, electronic, optical, ornaments, microfluidic devices, etc. However, monitoring and detection tool wear and tool breakage are imperative to achieve improved hole quality and high productivity in microdrilling. The various multisensor signals are used to monitor the condition of the tool. In this work, the vibration signals and cutting force signals have been applied individually as well as in combination to determine their effectiveness for toolcondition monitoring applications. Moreover, they have been used to determine the best strategies for toolcondition monitoring by prediction of hole quality during microdrilling operations with 0.4 mm microdrills. Furthermore, this work also developed an adaptive neuro fuzzy inference system (ANFIS) model using different time domains and wavelet packet features of these sensor signals for the prediction of the hole quality. The best prediction of hole quality was obtained by a combination of different sensor features in wavelet domain of vibration signal. The modelxe2x80x99s predicted results were found to exert a good agreement with the experimental results.