Abstract
Recently, EDM finishing technology has remarkably progressed, and very small surface roughness can be readily obtained by controlling the electrical discharge conditions. Also, EDM using powder mixed working fluids can improve the surface characteristics, such as wear resistance and corrosion resistance. Therefore, the EDM finished surface is well expected to be applied as a final metal mold surface in the near future. In that case, the surface characteristics of EDMed surface would influence the molding performance and the life of metal mold. As a new surface functionalization of EDMed surface, the surface characteristics of EDMed surface using a nickel powder mixed fluid is experimentally discussed in this study, since nickel coating has been widely applied to improve the corrosion resistance and the mold releasability of metal mold surface. Experimental analysis clarified that the resolidified layer containing nickel content could be formed on the surface by EDM in nickel powder mixed fluid. Also, the water repellency and the releasability of molded resin from the EDMed surface could be improved.
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