EDM Method and apparatus with successive trains of intermittentl

Details EDM Method and apparatus with successive trains of intermittentl EDM Method and apparatus with successive trains of intermittentl

1979-07-12

1985-03-05

Shaw, Clifford C.

Electric heating

Metal heating

Cutting or disintegrating

219 69P, 219 69C, B23P 108

Patent

active

045033099

ABSTRACT:
EDM method and apparatus in which the electrical discharge machining pulses are triggered by the application across the machining gap of a succession of pulse trains of discrete elementary pulses whose duration and peak current are preset for a desired machining result. At least one of the elementary pulses in each train is increased with respect to its energy content, i.e. the energy discharged through the machining gap, substantially higher than the preset value to permit machining to continue with stability or for restoration of the stable machining action when the gap becomes unstable due to its reduced spacing. The increase of the energy is effected by increasing one or both of pulse duration and pulse peak current. The proportion of the number of increased energy pulse over the number of preset elementary machining pulses or the proportion in energy content or consumption of increased energy pulses to preset elementary machining pulses is set to be not greater than 15%, preferably not greater than 10%.

REFERENCES:
patent: 3864541 (1975-02-01), Inoue

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