According to the processing requirements of precision flow hole of aviation nozzle,the variation of tool-electrode wear was firstly analyzed,which indicated that the tool electrode could machine several micro-holes in its steady wear stage.Moreover,the effects of open-circuit voltage,pulse width,pulse interval and feeding rate on micro-hole drilling were investigated.The optimized machining parameters for micro-hole were obtained:open-circuit voltage of 70 V,pulse width of 0.5 μs,pulse interval of 3.5 μs,and feeding rate of 10.0 mm/min.Eventually,18 aviation nozzles with an average diameter of(0.128±0.002)mm were fabricated using the optimized machining parameters.And it was found that the machined flow holes were straight and uniform,which can meet its processing requirements,so as to the machining feasibility of micro-EDM had been verified.
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