Punching of noncircular micro-holes and development of micro-forming

In this paper, vibration-EDM technology was introduced by the vibrating worktable designed to fabricate noncircular micro-electrodes and micro die-openings using wire electro-discharge grinding (WEDG). Micro punches and micro die-openings with different clearances were fabricated by controlling the...

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Bibliographic Details
Published in:Precision engineering 2007-07, Vol.31 (3), p.210-217
Main Authors: Chern, Gwo-Lianq, Wang, Sen-De
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Forming
Mechanical engineering. Machine design
Metals. Metallurgy
Micro-EDM
Micro-forming
Micro-punching
Noncircular micro-hole
Precision engineering, watch making
Production techniques
Vibration-EDM
WEDG
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Summary:In this paper, vibration-EDM technology was introduced by the vibrating worktable designed to fabricate noncircular micro-electrodes and micro die-openings using wire electro-discharge grinding (WEDG). Micro punches and micro die-openings with different clearances were fabricated by controlling the spark gap in micro electrical discharge machining (micro-EDM). The micro-punching experiments include producing triangular and hexagonal micro-holes with a side length of 200 μm on brass strip. Punching of successive hexagonal micro-holes was also carried out successfully. The micro-forming experiments were conducted on copper and brass, producing cup-shaped protrusions with a diameter of 300 μm. All the experimental results show that the modified micro-punching machine is able to perform both micro-punching and micro-forming operations.
ISSN:0141-6359
1873-2372
DOI:10.1016/j.precisioneng.2006.09.001