A study on stainless steel machining by using Electro-chemical machining with precise electrophoretic deposition polishing.

• Main Authors: Hai-Ping TSUI, 崔海平
• Other Authors: Biing Hwa Yan
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/76206647850532888197

博士 === 國立中央大學 === 機械工程研究所 === 96 === Surface roughness of the machined parts can be improved by polishing process. Nevertheless, manufacturing polishing wheels with micro abrasive grains, especially those smaller than 1~2 μm, is extremely difficult. When polishing wheels with larger abrasive grains are used in polishing, the polishing marks on the surface of the specimen are wider. The mirror-like surface can not easily obtained. It is more difficult to polish the machined micro holes. In view of such drawbacks, this study aims to enhance the surface quality and precision of machined parts. In this study, three approaches improve the surface roughness and machining precision of stainless steel plate are proposed. Three approaches are the mirror surface polishing by using the electrophoretic deposition method, Electro-chemical micro drilling (ECMD) by using helical tool, ECMD and Electrophoretic Deposition (EPD) polishing complex micro-hole machining. For the first approach, the experimental results indicate not only that SiC particles of size 0.9~1.5 µm were used in EPD polishing, but also that the initial roughness of the turning and the EDM machined surface could be improved from 0.5 µm Ra and 1.67 µm Ra to 0.03 µm Ra and 0.05μm Ra respectively. The second approach using a micro helical tool as a novel solution in ECMD process to improve the machining accuracy. The reaction products can be squeezed out of the machining zone. The inlet and outlet diameters of the micro holes could be improved from 425 μm and 362 μm using micro cylindrical tool to 355 μm and 299 μm respectively. Finally, ECMD and EPD polishing complex micro-hole machining experiment was performed. The micro helical tool can be deposited with SiC particles in Phenolic Formaldehyde Resin solution as a hybrid micro-tool by electrophoretic deposition phenomenon. The hybrid micro-tool is used in ECMD and EPD polishing complex micro-hole machining.experiments. When the helical tool is used, the inner surface roughness of micro hole is 0.4 µm Ra. When the hybrid micro-tool is used, the inner surface roughness of micro hole declines markedly to 0.041 µm Ra. The inner surface roughness of micro hole can be significantly improved.