Device and process for electrical-discharge machining of a three

Details Device and process for electrical-discharge machining of a three Device and process for electrical-discharge machining of a three

1993-02-12

1994-10-11

Evans, Geoffrey S.

Electric heating

Metal heating

Cutting or disintegrating

219 6915, 219 692, 36447404, 364578, B23H 720

Patent

active

053549619

ABSTRACT:
An EDM device for machining by electro-erosion a three-dimensional cavity by compensating for tool-electrode wear, which device includes a mechanism for rotating a tool electrode whose diameter is small in comparison to the dimensions of the cavity being eroded, a numerical control unit of known type, which controls relative three-dimensional movement between the tool electrode and the workpiece, apparatus for controlling volumetric wear rate, and computational apparatus equipped for storing the volumic shape of the cavity to be eroded in the form of virtual fine parallel layers superimposed on one another, for simulating a tool path so that the tool tip sweeps groove by groove across said successive layers, and for transmitting a corresponding signal to the three-dimensional control unit, characterized by a simulator that is programmed to calculate prior to machining the longitudinal wear of the rotating tool or a value intended for additional axial feed of the tool electrode and continuously compensating for said longitudinal wear, this calculation being made from preexisting, known technological data and parameters characterizing the geometry of the electrodes, and designed to transmit to the three-dimensional control unit a corresponding signal continuously compensating for this wear.

REFERENCES:
patent: 4833617 (1989-05-01), Wang
patent: 4879667 (1989-11-01), Gorski et al.
patent: 5101363 (1992-03-01), Rutkowski

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