| Summary: | 碩士 === 國立中央大學 === 機械工程研究所 === 96 === The study presents ECMD and EPDP complex micro-hole machining by using helical tool simultaneously. This experiment includes two parts:
First, ECMD machining by using helical tool is investigated. New electrolyte is carried to the machining area by rotating helical tool. Therefore, these bubbles, metal oxides and heat that produced by ECM reaction can be removed. Electrolyte also can be renew in the machining area. The inlet and outlet diameters of the micro holes could be improved from 425 μm and 362 μm using cylindrical tool to 355 μm and 299 μm respectively. The result of using helical tool as a novel solution in ECMD process to improve the machining accuracy.
Second, ECMD and EPDP complex micro-hole machining experiment was performed. The helical tool can be deposited with SiC particles in Phenolic resin solution as a micro hybrid tool by electrophoretic deposition phenomenon. The SiC-coated helical tool (micro hybrid tool) is used in ECMD and EPDP complex micro-hole machining.experiments. Expect to using fine SiC particles and insulate coating layer that modify inner surface roughness of micro hole , taper and machining accuracy. When the helical tool is used, the inner surface roughness of micro hole is Ra 0.4 µm. By using micro hybrid tool , the inner surface roughness of micro hole declines markedly to Ra 0.041 µm. The inner surface roughness of micro hole can be significantly improved.
|
|---|
