Swing Mechanism for Micro EDM Drilling of Fuel Jet Nozzles
To improve the spray effects of fuel-jet nozzles, the deep micro-holes of the nozzles require taper angle 0°-2° along jet direction. In this paper, a taper-swinging mechanism (TSM) is designed to swing a taper angle on an electrode wire for micro electrical discharge machining (EDM) of micro-taper holes. The features of TSM are as follows. First, the electrode wire and its guider are swung simultaneously during the micro-EDM drilling. Second, the center of a fixed sphere as the taper vertex is positioned on the surface of workpiece. Thirdly, non-rotating of the electrode wire and the fixed center avoid the errors of the swing motion. The taper holes with the corresponding angles of 0.12°, 0.40°, 0.83°, and 1.32° were machined by using TSM. The batch production showed that the consistency accuracy of holes’ diameters reached 4μm. In addition, the TSM was applied in a micro EDM machine tool.
Liangchi Zhang, Chunliang Zhang, Jeng-Haur Horng and Zichen Chen
H. Tong et al., "Swing Mechanism for Micro EDM Drilling of Fuel Jet Nozzles", Advanced Materials Research, Vols. 591-593, pp. 391-395, 2012