Patent ID: 9511434
Filing Date: 2016-12-06
CPC Classification: B23H

Claim Text:
1. A method for electrical discharge machining a workpiece including the steps of: presenting an elongate electrode to the workpiece with a spark gap therebetween, the electrode having an axial bore, flowing a dielectric fluid through the bore and into the gap, eroding the workpiece by electrical discharge between the tip of the electrode and the workpiece, displacing the electrode in a direction aligned with the long axis of the electrode to maintain the gap as the electrode wears and the workpiece is eroded, and simultaneously with the displacement, producing vibratory movement of the electrode, the vibratory movement being aligned with the long axis of the electrode; wherein the vibratory movement of the electrodes causes pulsating jets of fluid which are sent along the bore to the gap, the pulsating jets having a pulse frequency which is the same as the frequency of the vibratory movement of the electrode.