Arc monitor for electrical discharge machining

Details Arc monitor for electrical discharge machining Arc monitor for electrical discharge machining

1980-07-29

1982-03-30

Shaw, G. C.

Electric heating

Metal heating

Cutting or disintegrating

219 69S, B23P 102

Patent

active

043225950

ABSTRACT:
Apparatus for monitoring EDM is described in which the voltage across the gap between an electrode and a workpiece is passed through a filter which selects those frequencies which are present only during sparking across the gap. The voltage across the gap is also applied to a comparator which detects discharge across the gap by determining whether the gap voltage is between two levels. The proportion of discharge time in which arcs occur is derived by a time-divider circuit which receives signals after processing from the filter and the comparator.

REFERENCES:
patent: 3624337 (1971-11-01), Kauffman
patent: 3662143 (1972-05-01), Davis
patent: 3705286 (1972-12-01), Kondo et al.
patent: 3746930 (1973-07-01), Van Best et al.
patent: 4009361 (1977-02-01), Stanton et al.
"Monitoring and Controlling the EDM Process" Bhattacharyya et al., Transactions ASME, Paper No. 79-WA/PROD-2, Dec. 1979.

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