High-speed electric spark hole machining, an emerging advanced manufacturing technology

High-speed electric spark hole machining is an emerging advanced manufacturing technology in recent years.

The principle is that a high-pressure working fluid is passed through the rotating hollow tubular electrode to wash away the machining debris while maintaining a high current density for continuous normal discharge. The rotation of the electrode can make the end face loss uniform and not be deflected by the reaction force of the high pressure and high speed working fluid. However, in the case of EDM small hole processing, especially deep hole processing, it is easy to leave the burr core and the removed fine particles of the workpiece material on the workpiece, hinder the high-speed circulation of the working fluid, and make the processing speed low and the processing unstable. As well as the increase of tool electrode loss, etc., these tiny particles trapped in the narrow processing gap often cause secondary discharge, which makes the process unstable and even short-circuit phenomenon, which makes processing difficult.

On the other hand, since the small-diameter tool electrode is liable to sway or vibrate during processing, it is more conducive to secondary discharge. It is precisely because of the existence of such secondary discharge caused by the electric discharge small hole processing that the thickness of the remelted layer is increased, which puts forward higher technical requirements for the processing technology of the high pressure turbine blade of the aeroengine. Through process test and verification, we can reasonably optimize the process parameters of EDM machining, which can reduce the remelting layer and improve the quality of film hole processing.

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