Precision machining of high aspect-ratio rotational part with wire electro discharge machining

다국어 초록 (Multilingual Abstract)

Precision and micro rotational parts are widely used in various industries, such as micro probes for medical instruments, contact pins for micro assembly applications, micro electrodes for micro Electrical discharge machining (μ-EDM) or micro Electro-chemical discharge machining (μ-ECDM). In this research, a uniform annular area layer by layer feeding strategy was proposed to fabricate high aspect ratio, small radii rotational components on a conventional Wire electrical discharge machining (WEDM) machine equipped with an auxiliary spindle. The uniform annular area layer by layer feeding strategy consisted of the roughing and finishing stages. First, the theoretical Material removal rate (MRR) and radial infeed rate for each layer were determined for the roughing stage, and the theoretical surface roughness, R z in the finishing stage was researched. Then, a series of optimization experiments were conducted to investigate the influence of the parameters on MRR and the machined surface roughness. A group of pin electrodes were machined by applying this feed strategy with the optimized parameters, and the minimum diameter of the pin electrodes was 40 μm with an aspect-ratio of 60. Finally, micro electrodes for an injection nozzle were achieved with this novel process and a qualified injection nozzle for powder metallurgy was fabricated with the machined micro electrodes.

참고문헌 (Reference)

1 T. Masuzawa, "Wire electrodischarge grinding for micro-machining" 34 (34): 431-434, 1985

2 T. Masuzawa, "State of the art of micro-machining" 49 (49): 473-485, 2000

3 O. Koch, "Recent progress in micro-electrical discharge machining, Part I, Technology" 2001

4 Li Jianzhong, "Prediction of aspect ratio of a micro hole drilled by EDM" 대한기계학회 27 (27): 185-190, 2013

5 H. Tong, "Precision machining of micro tool electrodes in micro EDM for drilling array micro holes" 39 : 100-106, 2014

6 E. Uhlmann, "Micro-machining of cylindrical parts by electrical discharge grinding" 160 (160): 15-23, 2005

7 T. Masuzawa, "Micro-EDM (Keynote paper)" 3-19, 2001

8 H. M. Chow, "Micro slit machining using electro-discharge machining with a modified rotary disk electrode (RDE)" 91 : 1999

9 T. Masaki, "Micro electro discharge machining and its applications" 21-26, 1990

10 Y. Li, "Micro electro discharge machine with an inchworm type of micro feed mechanism" 26 (26): 7-14, 2002

11 M. J. Haddad, "Material removal rate(MRR)study in the cylindrical wire electrical discharge turning(CWEDT)process" 199 : 369-378, 2008

12 E. Uhlmann, "Machining of micro rotational parts by wire electrical discharge grinding" 2 (2): 227-233, 2008

13 M. J. Haddad, "Investigation of cylindrical wire electrical discharge turning(CWEDT)of AISI D3tool steel based on statistical analysis" 198 (198): 77-85, 2008

14 E. Weingärtner, "Influence of workpiece circumferential speed in wire electrical discharge machining" 6 : 238-243, 2013

15 Y. Uno, "Electrical discharge machining of a groove with a rotating disk electrode" 1 : 13-20, 1996

16 J. Qu, "Development of the cylindrical wire electrical discharge machining process, Part 2: Surface integrity and roundness" 124 (124): 708-714, 2002

17 J. Qu, "Development of the cylindrical wire electrical discharge machining process, Part 1: Concept, Design, and Material Removal Rate" 124 (124): 702-707, 2002

18 P. Matoorian, "An experimental study for optimization of electrical discharge turning(EDT)process" 204 (204): 350-356, 2008

19 A. Mohammadi, "A new approach in surface roughness and roundness improvement in wire electrical discharge turning based on statistical analyses" 11-18, 2006

20 J. Lenarcic, "A humanoid shoulder complex and the humeral pointing kinematics" 19 (19): 499-506, 2003