Cut-off protection system for electrical discharge machining app

Details Cut-off protection system for electrical discharge machining app Cut-off protection system for electrical discharge machining app

1982-03-23

1984-09-11

Paschall, M. H.

Electric heating

Metal heating

Cutting or disintegrating

219 69S, B23P 108

Patent

active

044711980

ABSTRACT:
A programmable system for controlling machining current magnitude and reducing it in a step function as gap voltage falls indicating gap short circuit condition. A set of off-time numbers are computed and stored in an off-time counter. These numbers are recomputed each time a new on or off time is entered in the pulse generator. The original off-time is the normal cutting parameter. As the gap voltage drops, indicating problems, the off-time starts doubling or increasing in a like manner until it has reached many times its normal duration.

REFERENCES:
patent: 3614368 (1971-10-01), Lobur
patent: 3670136 (1972-06-01), Saito et al.
patent: 3697879 (1972-10-01), Holliday
patent: 4071729 (1978-01-01), Bell, Jr.
patent: 4292490 (1981-09-01), Bell, Jr. et al.

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