Research on conductive-material-filled electrodes for sidewall insulation performance in micro electrochemical machining

Liu, Guodong; Zhu, Yiting; Liu, Sheng-Gui; Li, Chaojiang

doi:10.1007/s40436-022-00429-7

Cited by 3 publications

(1 citation statement)

References 19 publications

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“…Micro-EDM technology has the advantages of no cutting force and non-contact processing and has been industrially applied in micro-hole machining [7][8][9]. For machining microholes with diameters less than 100 µm, hollow tool electrodes with internal flushing are generally ineffective and not used owing to liquid pressure loss, and solid tool electrodes with circular cross-sections are economically applicable in industry [10,11]. In previous studies, it was observed that when the aspect ratio of micro-holes is less than or equal to 10:1, the machining accuracy and efficiency can meet the requirements of industrial applications [6].…”

Section: Introductionmentioning

confidence: 99%

Pulsed power supply of Tr-RC and Tr-RLC topologies for improvement of micro electrical discharge machining

Cao,

Li,

Tong

et al. 2024

J. Micromech. Microeng.

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Pulsed power supply is one of the key technologies in micro-electrical discharge machining (micro-EDM), particularly in machining micro-holes with high aspect ratios. Through the disadvantageous waveform feature analysis of the controllable RC pulsed power supply with random interpulse voltage, insufficient capacitor charging, and uncontrolled reversed fluctuations, an improved Tr-RC pulsed power supply with a promoted function is proposed. Discharge pulses with high power density have the potential to synchronously improve machining efficiency and accuracy. Increasing the discharge peak current by optimizing the pulsed-power topology is a feasible means of improving the power density. A pulsed power supply of the Tr-RLC topology introducing an inductor-controlled branch according to Faraday's law of electromagnetic induction was further proposed based on the improved Tr-RC pulsed power structure. The discharge waveforms of Tr-RLC pulsed power supply achieve an average peak current of 1.3 A with inductance of 20 μH, compared to 0.5 A with Tr-RC pulsed power supply. For machining micro-holes with aspect ratios of 10:1, 20:1, and 30:1, the Tr-RLC pulsed power supply exhibited an efficiency improvement of 25%, 22%, and 17%, respectively, with reduced taper error and a slight decrease in tool wear rate compared to the Tr-RC pulsed power supply.

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