Title: Process and apparatus for electro-erosion machining by electrical discharges employing variable cut-off time intervals between pulse trains and/or pulse trains of variable durations

Abstract: An electro-erosion process and apparatus for improving the rate of material removal from a workpiece and for decreasing the rate of wear of the electrode tool in an electrical discharge machining apparatus, by controlling the average value of the machining current across the machining gap between the electrode tool and the workpiece by providing cut-off time intervals between consecutive pulse trains at a frequency of at least 200 Hz, and by controllably varying at least one of the parameters of operation consisting of the number of the pulses included within a single pulse train, the duration of application of said pulses within a single pulse train, and at least the longest of the intervals of time comprised between two consecutive voltage pulses.

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Inventors: Pfau, Jean (Geneva, CH)
Rhyner, Heinz (Geneva, CH)
Balleys, Francois (Geneva, CH)

Application Number: 491503
Filing Date: 1973-08-24
Publication_date: 1976-03-09
Assignee: Ateliers des Charmilles, S.A. (Geneva, CH)
Primary Class(es): 219/69.17
Other Classes:
US Patent Ref:

3056065	Sep, 1962	Porterfield	219/69.
3590317	Jun, 1971	Sennowitz	219/69.
3614368	Oct, 1971	Lobur	219/69.
3623148	Nov, 1971	Berghausen	219/69.
3697719	Oct, 1972	Verner	219/69.
3755645	Aug, 1973	Kauffman	219/69.
3789182	Jan, 1974	Verner	219/69.

Other Refs:
Primary Examiner: Reynolds, Bruce A.
Assistant Examiner:
Attorney: Hauke, Patalidis & Dumont