High aspect ratio circular micro-hole by micro-EDM
Date Issued
2012
Date
2012
Author(s)
Chou, Shih-Chieh
Abstract
Micro-EDM is a simple way of machining which is commonly used in conductive metal materials and widely employed in micro-hole drilling. However, when drilling to a certain depth, some difficulties pertaining to dielectric fluid entering the discharge gap and the remove of debris will arouse. Therefore the depth of micro holes is limited.
In order to solve the difficulties confronted when dielectric fluid entering the discharge gap and the remove of debris, this study proposed a method of micro-hole drilling process based on micro electro-discharge machines with dielectric jet position and helix angle. A deeper micro hole can be achieved when above dielectric jet posi-tion drilling process and smaller helix angle electrode can achieve deeper and more circular hole. While machining micro holes with inclined-feeding and vibra-tion-assisted components in 10-degree-downward, vertical-feeding is almost tenth of inclined-feeding, causing the machined holes with ovality 50% on almost all three-axis platform. In order to solve the problem, this study proposed a method of a feeding-angle modified imputation Strategy. The ovality of a 10-degree-downward inclined feeding can be reduced to 8% and aspect ratio of 16 with cylinder electrode, and the ovality can be reduced to 0.2% and aspect ratio of 20.5 with 17-degree helix angle electrode.
Subjects
Micro-EDM
micro hole
hole precision
inclined feeding
vibration-assisted machining
Type
thesis
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