Importance

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Abstract

The invention relates to electrical discharge milling machines using tool electrodes subject to longitudinal wear. The inventive discharge milling machine is equipped with a numerical controller executing at least one control cycle for compensating the wear considering the following steps:

(a) determining the volume Q eroded by each discharge,(b) calculating the distance s travelled by the tool from one effective discharge to the next,(c) calculating the actual eroded linear volume M [m3/m] for at least one effective discharge, M forming a measurement sample from the values Q and s,(d) comparing said sample M with the corresponding set value C to generate an error D=C−M [m3/m], and(e) calculating and transmitting a command by the numerical controller intended to reduce this error D during the following cycle or cycles.

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First Claim