Wire EDM control circuit for rough and finished machining

摘要

PCT No. PCT/JP83/00407 Sec. 371 Date May 22, 1984 Sec. 102(e) Date May 22, 1984 PCT Filed Nov. 11, 1983 PCT Pub. No. WO84/01915 PCT Pub. Date May 24, 1984.A wire EDM circuit uses a references voltage connected to a short circuit detector for comparing an average voltage with a reference voltage. Whenever the average voltage is below the reference voltage the numeric controller causes the pulse oscillator to stop generating a pulse stream. In order to also finish machine the workpiece a reference voltage switching circuit is used to decrease the reference voltage. There is also provided an internal signal blocking circuit to block an interval signal oscillator to stop generation of the pulse stream when the wire electrode is temporarily in contact with the workpiece or when phenomena similar to a short circuit occurs.