Study on the Micro EDM and Improved Machining Characteristics

• Main Authors: Yang,An-Bang, 楊安邦
• Other Authors: Hsu, Chun-Yao
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/51378437131246528682

碩士 === 龍華科技大學 === 機械工程系碩士班 === 103 === Micro milling electrical discharge machining (micro milling EDM) enables the machining of micro cavities, micro grooves or micro curved surfaces, under non-contact conditions can be used to machine almost every conductive material, regardless of its hardness with simple cylindrical or tubular electrodes. This paper uses a grey-Taguchi method to examine the optimization of process parameters (such as Pulse on-time/μs, Pulse off-time/μs, Discharge current/A and Working time/s), for the micro milling EDM of Ti-6Al-4V alloy, using tungsten carbide (WC) electrodes. A Taguchi method with an L9 (34) orthogonal array and a signal-to-noise ratio (S/N) and analysis of variance (ANOVA) are used, to investigate the electrode wear rate, material removal rate, overcut performance characteristics of the micro EDM. Findings based on the grey-based Taguchi analysis, to determine the parameters of the micro milling EDM, by considering multiple performance characteristics. In the confirmation runs with grey relational analysis, can receive an improvement of 1.18% in electrode wear rate, 10.92% in material removal rate, and 4.34% in overcut. Furthermore, a comparative study of the performance of WC, WC-coated Ag, WC-coated Ni-P, WC-coated TiN and WC-coated ZrN electrodes for the micro EDM milling is also presented.