A study on pulse control for small-hole electrical discharge machining

Small-hole EDM has a problem of debris evacuation from the narrow gap between the electrode and workpiece. The presence and difficulty in evacuating the debris formed during an erosion process limit the achievable aspect ratio. To address the problem of debris accumulation, a pulse generator, which...

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Bibliographic Details
Published inJournal of materials processing technology Vol. 212; no. 7; pp. 1463 - 1471
Main Authors Jiang, Yi, Zhao, Wansheng, Xi, Xuecheng
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.07.2012
Subjects
Aspect ratio
Debris
Discharge
Drilling
EDM
Electric discharge machining
Erosion control
Evacuation
MOSFETs
Pulse generator
Small-hole
Pulse generator
Small-hole
EDM
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Summary:Small-hole EDM has a problem of debris evacuation from the narrow gap between the electrode and workpiece. The presence and difficulty in evacuating the debris formed during an erosion process limit the achievable aspect ratio. To address the problem of debris accumulation, a pulse generator, which is able to shut off harmful pulses and to apply high discharge energy pulses, is developed. A FPGA chip is used as the master controller for the determination of pulse discharge status and MOSFET switching. A series of experiments are carried out to examine the machining performance by shutting off harmful pulses and applying high discharge energy pulses. The experimental results show that the efficiency of small-hole drilling is improved and the aspect ratio is increased.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
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ISSN:0924-0136
DOI:10.1016/j.jmatprotec.2012.01.022