Electric heating – Metal heating – Cutting or disintegrating
Patent
1976-11-17
1977-09-13
Reynolds, Bruce A.
Electric heating
Metal heating
Cutting or disintegrating
B23P 108, B23P 114
Patent
active
RE0293989
ABSTRACT:
A servosystem for electrical [maching] machining processes adapted to regulate a spark-discharge gap in electrodischarge machining and other material-removal, shaping or forming operations in which the energy of an electrical discharge across the gap is exploited. Instead of the usual reference voltage or other electrical value for comparison with a gap parameter whereby the difference or other algebraic comparison controls the electrode drive, a gap detector is provided to feed a substantially continuous [(anlog)] (analog) value to a discriminator having a threshold value and producing a digital output in accordance with the comparison. The digital output represents an "advance" or a "retract" condition and is communicated via a suitable switch or amplifier to the respective electromagnetic member of the control system, the latter member being a servomotor mechanically coupled with the movable electrode or a fluid-control valve hydraulically or pneumatically coupled with the movable electrode.
REFERENCES:
patent: 1061612 (1913-05-01), Heroult
patent: 2761050 (1956-08-01), Ballhausen
patent: 3531615 (1970-09-01), Zammit
patent: 3531616 (1970-09-01), Sennowitz
patent: 3581043 (1971-05-01), Ullmann et al.
Reynolds Bruce A.
Ross Karl F.
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