High aspect ratio micro-hole drilling aided with ultrasonic vibration and planetary movement of electrode by micro-EDM

By Zuyuan Yu, Yan Zhang, Jianzhong Li, J. Luan, F. Zhao, Dongming Guo. 2009

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Multiple performance characteristics optimization for Al 7075 on electric discharge drilling by Taguchi grey relational theory (2015, background): “Yu et al. (2009) said that when a micro-hole is drilled deeply by EDM, the viscous resistance in the narrow discharge gap causes difficulty in the removal of debris and bubbles from the working area, leading to frequent occurrences of abnormal discharges and resulting in extensive electrode wear.”
Hybrid manufacturing in micro/nano scale: A Review (2014, result): “Nanyang Technical University reported an increase in the aspect ratio of 232 Dalian University of Technology reported an increase in the volumetric removal rate of 250% and an increase in the aspect ratio of 125% compared with no vibration.(51) Harbin Institute of Technology reported improvements in”
Review of Electrochemical and Electrodischarge Machining (2013, background): “A combination of ultrasonic vibrations and planetary tool movement generates micro holes with aspect ratio as high as 29 (figure 13) [158].”
Fabrication of deep micro-holes in reaction-bonded SiC by ultrasonic cavitation assisted micro-EDM (2014, methodology): “Ultrasonic vibration has also been carried out in combination with other process improvements, such as EDM using non-circular electrode [13,14], planetary movement of tool [15], helical micro-tool [16], and micro-powders [17].”