Development, modeling, and experimental investigation of low frequency workpiece vibration-assisted micro-EDM of tungsten carbide
This present study intends to investigate the feasibility of drilling deep microholes in difficult-to-cut tungsten carbide by means of low frequency workpiece vibration-assisted micro–electrodischarge machining (micro-EDM). A vibration device has been designed and developed in which the workpiec...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
American Society of Mechanical Engineers (ASME)
2010
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/30939/1/EDM_Vibration_ASME.pdf http://irep.iium.edu.my/30939/ http://manufacturingscience.asmedigitalcollection.asme.org/article.aspx?articleid=1452347 |
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| Summary: | This present study intends to investigate the feasibility of drilling
deep microholes in difficult-to-cut tungsten carbide by means of
low frequency workpiece vibration-assisted micro–electrodischarge
machining (micro-EDM). A vibration device has been
designed and developed in which the workpiece is subjected to
vibration of up to a frequency of 1 kHz and an amplitude of
2.5 �m. An analytical approach is presented to explain the
mechanism of workpiece vibration-assisted micro-EDM and how
workpiece vibration improves the performance of micro-EDM
drilling. The reasons for improving the overall flushing conditions
are explained in terms of the behavior of debris in a vibrating
workpiece, change in gap distance, and dielectric fluid pressure in
the gap during vibration-assisted micro-EDM. In addition, the
effects of vibration frequency, amplitude, and electrical parameters
on the machining performance, as well as surface quality
and accuracy of the microholes have been investigated. It has
been found that the overall machining performance improves considerably
with significant reduction of machining time, increase in
MRR, and decrease in EWR. The improved flushing conditions,
increased discharge ratio, and reduced percentage of ineffective
pulses are found to be the contributing factors for improved performance
of the vibration-assisted micro-EDM of tungsten
carbide. |
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