Study of electrode feeding method for EDM hollowing

In order to minimize the subsequent cutting of aerospace structural parts of difficult-to-machine materials such as high-temperature alloys and to shorten the machining cycle, this paper proposes a machining method that uses electrical discharge machining (EDM) for initial hollowing. The method adopts a U-shaped fine copper tube electrode, with an open row of holes on this electrode in the processing area, and uses deionized water as a working medium to take advantage of the jet effect. The copper tube electrode in the processing area takes part in reciprocating movement to complete the EDM hollowing processing. Three types of feeds—linear feed, S-shaped feed, and lateral reciprocating feed—were designed for the copper tube electrodes. The material removal rate and tool wear ratio of the three feeds are compared and the etching mechanism is analyzed. It is found that the transverse reciprocating feed has the highest material removal rate, 29.99 mm3/min, which is 255