Study on Surface Modification of Optimal Parameter Design by Electrical Discharge Machining

• Main Authors: Jhou, Yong-Liang, 周勇良
• Other Authors: 林忠民
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/58863552571202609498

碩士 === 正修科技大學 === 機電工程研究所 === 97 === In this study, optimal parameter from the experimental results is obtained according to Taguchi Method, and a mechatronical dynamic electrical EDC tester with the discharge supply electricity instrument is employed to investigate the effects of supply voltage, gap distance, pulse-on duration time and pulse-off duration time on the mechanism of coating layer. Moreover, the coating layer surface is observed by using the optical microscope and SEM. 　　The results from Taguchi Method show that the optimal parameter combination is A2B3C3D1 for the surface roughness, A2B1C3D1 for distribution and A2B2C1D3 for the coating thickness. 　　The experimental results show that the coating thickness increases with increasing machining time, but decreases with increasing machining time after 142 seconds. However, the coating thickness increases with increasing supply voltage at the same machining time, but decreases with increasing supply voltage after 200 Volt. Furthermore, the coating thickness increases with increasing gap distance at the same supply voltage.