Electricity: motive power systems – Positional servo systems – Program- or pattern-controlled systems
Patent
1982-07-16
1985-08-27
Shoop, William M.
Electricity: motive power systems
Positional servo systems
Program- or pattern-controlled systems
318624, B23P 108
Patent
active
045380988
ABSTRACT:
A method and apparatus for controlling an electric discharge machine wherein a motor for moving an energized electrode relative to a workpiece is driven in accordance with command data. The method includes the steps of storing in a memory retraction control information contained in the command data, moving the electrode in an advancing direction relative to the workpiece by controlling the speed of the motor in accordance with machining feed speed information contained in the entered command data, monitoring the current position of the electrode by counting, via a counting device, pulses generated by a sensor whenever the motor rotates by a predetermined amount, moving the electrode in the retracting direction relative to the workpiece by reading in retraction speed from the retraction control information stored in the memory and controlling the speed of the motor on the basis of the retraction speed, when a signal indicative of a short circuit is generated, and moving the electrode in the advancing direction relative to the workpiece by reading in a re-advancing speed from the retraction control information stored in the memory, when a signal indicative of an end to the short circuit is generated.
REFERENCES:
patent: 3731044 (1973-05-01), Ullmann et al.
patent: 4005303 (1977-01-01), Inoue
Matsui Mitsuo
Matsumura Teruyuki
Bergmann Saul M.
Fanuc Ltd.
Shoop William M.
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