摘要(英) |
Drilling micro hole with micro-electric discharge machining (Micro-EDM) is an economic machining method. However, because of the electrode wearing, the precision of micro hole is not well enough. For solving this problem, we combined Micro-EDM, electrophoretic deposition (EPD) and ultrasonic vibration grinding to get high precision shaft with better inner surface.
Before experiment, we searched the best parameters of EPD first. Because loose abrasive grains are attracted to grinding tool (electrode) and fixed on the tool surface by EPD, this phenomenon will increase the ultrasonic vibration grinding efficiency, and we found 6 min(deposition time), pH8, 30V(potential), SiC 15wt%(concentration of slurry), 50rpm(electrode rotation rate) are the best parameters. After the process above, we modified the electrode shape with WEDG and drilled the micro hole on titanium alloy by the electrode that had made. Then improved the precision of micro hole by combination of EPD and ultrasonic vibration grinding.
As the result, when we set amplifier to be 5μm, electrode rotation rate to be 50rpm, and use stepped or breached electrode, the improvement of straightness will be up to 56%. And the inner surface roughness will be 0.449μm(Rz). Besides, using stepped electrode will get the best roundness. So this composite machining process was efficient method to improve the precision of micro holes. |
參考文獻 |
1.C. L. Kuo, T. Masuzawa, A Micro-Pipe Fabrication Process, Proc. Of IEEE MEMS’91, pp.80-85, 1991.
2.T. Masuzawa, M. Fujino, K. Kobayashi and T. Suzuki, Wire Electro-Discharge Grinding for Micro-Machining, Annals of the CIRP, 34, 1, pp.431-434, 1985.
3.K. Kagaya, Y. Oishi, K. Yada, Micro-electrodischarge machining using water as a working Fluid-I: Micro-hole Drilling, Precision Engineering, 8, 3, pp.156-162, 1986.
4.T. Masuzawa, M. Yamamoto and M. Fujino, A Micropunching System Using Wire-EDM, Proc. Of Int’l Symposium for Electromachining(ISEM-9), pp.86-89, 1989.
5.K. Kagaya, Y. Oishi, K.Yada, Micro-electrodischarge machining Using Water as a working Fluid-2: Narrow Slit Fabrication, Precision Engineering, 12, 4, pp.213-217, 1990.
6.W. Ehrfeld and H. Lehr, Deep X-Ray Lithography for the production of three-dimensional microstructures from metals, polymers and ceramics, Radiat. Phys. Chem. Vol.45 No.3, pp349-365, 1995.
7.Xi-Qing Sun, T. Masuzawa, M. Fjino, Micro ultrasonic machining and its applications in MEMS, Sensors and actuators A:Physical, 57, 2, pp.159-164, 1996.
8.Domoiniek Reynaerts, Paul-Henri’s Heeren, Hendrik Van Brussel, Microstructuring of silicon by electro-discharge machining(EDM) part I: theory, Sensors and actuators A:Physical, 60, 1-3, pp.212-218, 1997.
9.Seong. S. Choi, M. Y. Jung, D. W. Kim, M. A. Yakshin, J. Y. Park, Y. Kuk, Frabrication and microelectron gun arrays using laser micromachining, Microelectronic Engineering, 41-42, pp.167-170, 1998.
10.R. K. Kupka, F. Bouamrance, C. Cremers, S. Megtert, Microfabrication: LIGA-X and applications, Applied Surface Science, 164, 1-4, pp.97-110, 2000.
11.A Cheng Wang, Biing Hwa Yan, Xiang Tai Li, Fuang Yuan Huang, Use of micro ultrasonic vibration lapping to enhance the precision of microholes drilled by micro electro-discharge machining, International Journal of Machine Tools and Manufacture, 42, pp.915-923, 2002.
12.張榮顯 著,”磁力研磨加工應用於放電加工表面改善之研究”,國立中央大學碩士論文,2001
13.張渭川編譯,”放電加工的結構與實用技術”,復漢出版社
14.鳳誠三郎、蒼藤尚雄,”放電加工”,復漢出版社
15.蘇品書編著,”線切割放電加工”,復漢出版社
16.賴耿陽,”超音波工學理論實務”,復漢出版社
17.蘇品書譯著,”特殊加工”,復漢出版社
18.G. E. Miller, Special Theory of Ultrasonic Machining, Journal of Applied physical Vol.28, No.2, pp.149~156, 1957.
19.張有義、郭蘭生,”膠體及界面化學入門”,高立圖書有限公司
20.H. C. Hamaker, “Physical”, 4 (1937) 1058-64.
21.K. Takahata, S. Aoki and T. Sato, Fine Surface Finishing Method for 3-Dimensional micro Structures, IEEE, pp.73-78, 1996.
22.卓漢明 著,”鈦合金(Ti-6Al-4V)之微細放電加工特性研究”,國立中央大學博士論文,1999
23.劉國雄、林樹均、李勝隆、鄭晃忠、葉均蔚,”工程材料科學”,全華科技圖書股份有限公司。 |