This work presents an innovative method for the Electrical Discharge Drilling of ultra-high aspect ratio (AR> 30) micro holes. It makes use of tools insulated on the sidewall by means of a coating. The concept is to promote the process stability of micro EDM deep drilling by preventing secondary sparks. The performance of standard and customized tools are compared and reviewed against the main criteria of shape quality, tool wear and machining time. Process capabilities are also defined for a given coating. In average, micro holes, about 0.17 mm in diameter and 14 mm deep (AR 80) could be obtained within 1 hour. A micro punching die is also realized by combining this strategy with micro wire EDM.
EDM drilling of ultra-high aspect ratio micro holes with insulated tools
ANNONI, MASSIMILIANO PIETRO GIOVANNI;
2013-01-01
Abstract
This work presents an innovative method for the Electrical Discharge Drilling of ultra-high aspect ratio (AR> 30) micro holes. It makes use of tools insulated on the sidewall by means of a coating. The concept is to promote the process stability of micro EDM deep drilling by preventing secondary sparks. The performance of standard and customized tools are compared and reviewed against the main criteria of shape quality, tool wear and machining time. Process capabilities are also defined for a given coating. In average, micro holes, about 0.17 mm in diameter and 14 mm deep (AR 80) could be obtained within 1 hour. A micro punching die is also realized by combining this strategy with micro wire EDM.| File | Dimensione | Formato | |
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EDM_deep_hole_light2.pdf
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