Methods and apparatus for electrical discharge machining

Details Methods and apparatus for electrical discharge machining Methods and apparatus for electrical discharge machining

1981-03-31

1984-04-17

Paschall, M. H.

Electric heating

Metal heating

Cutting or disintegrating

219 695, 219 696, B23P 108

Patent

active

044436807

ABSTRACT:
Some forms of EDM employ monitoring of sparking in the gap between an electrode and a workpiece to control the machining process but difficulties arise in providing a threshold which when applied to the monitoring signal indicates the onset of arcing. This problem has been found to be due to the change in amplitude which occurs with gap current in monitoring signals derived in some ways. The invention uses a threshold control circuit to provide a variable reference signal for a comparator which compares the monitoring and reference signals, the magnitude of the reference signal varying inversely with the gap current. The output of the comparator determines by way of a drive circuit and transistors whether or not voltage is applied between an electrode and a workpiece.

REFERENCES:
patent: 3705286 (1972-12-01), Kondo et al.
patent: 4321451 (1982-03-01), Inoue
patent: 4322595 (1982-03-01), Fowell et al.
S. K. Bhattacharyya et al., "Monitoring the E.D.M. Process by Radio Signals," Int. J. Prod. Res., 1978, vol. 16, No. 5, pp. 353-363.

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