Patent ID: 6465754
Filing Date: 2002-10-15
Classification: B23H

Abstract:
Process for machining by electroerosion, according to which a piece is machined by means of a tool (1) separated from each other by a machining distance (L) of a working space (G) in which is located a machining fluid, by applying an electrical voltage between the tool and the piece to give rise to erosive discharges, characterized by the following succession of phases during an erosive discharge:a) a delay phase (tD) during which an alternating voltage is applied between the tool (1) of the piece (2) at a frequency such that the ions present in the machining fluid (3) follow oscillating paths (P2) substantially shorter than said machining distance (L) separating the tool and the piece and during which an ionized path is created between the tool and the piece by the effect of said alternating voltage, b) a sparking phase (tA) beginning with the detection of a current flowing between the tool and the piece and during which a source of continuous voltage (4) forms and maintains an erosive discharge current (14) and c) a pause phase (tB) during which no voltage is applied between the tool (1) and the piece (2) so that the machining fluid (3) present between the tool and the piece deionizes and the ionized path disappears; and by the fact that this succession of phases is repeated for the duration of machining.