NC electroerosion method and apparatus

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219 69M, 219 69G, 318592, 364167, 364182, G06F 1546, B23P 108

Patent

active

046060073

ABSTRACT:
An NC-EDM method and apparatus wherein a succession of electrical discharges is effected across an EDM gap to effect electroerosive stock removal from the workpiece while the tool electrode is consecutively advanced relatively into the workpiece under NC commands which in a prescribed set define a desired path and extent of the relative advancement. Control is effected to act on the EDM power supply for maintaining parameters of the electrical discharges in a given EDM mode during an initial period of the consecutive advancement of the tool electrode relative to the workpiece. The arrival of the tool electrode at a predetermined position relative to the workpiece spaced by a preselected distance from its final position which is determined by the said extent of the consecutive relative advancement is sensed for switching the parameters of the electrical discharges into another EDM mode and maintaining the switched parameters until the tool electrode reaches the said final position relative to the workpiece.

REFERENCES:
patent: 3849624 (1974-11-01), Dulebohn et al.
patent: 3975607 (1976-08-01), Ullmann et al.
patent: 3975608 (1976-08-01), Ullmann et al.
patent: 4370537 (1983-01-01), Oizumi et al.
patent: 4425492 (1984-01-01), Wyss
patent: 4431897 (1984-02-01), Ito

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