Method of and apparatus for electrical discharge machining a sma

Details Method of and apparatus for electrical discharge machining a sma Method of and apparatus for electrical discharge machining a sma

1980-08-29

1983-07-12

Shaw, C. C.

Electric heating

Metal heating

Cutting or disintegrating

219 69V, 219 69D, B23P 108

Patent

active

043932924

ABSTRACT:
An improved method of and apparatus for the electrical discharge machining of a small and deep hole of a diameter of 1 mm or less and a depth-to-diameter ratio of at least 5 into or through a workpiece wherein a water machining fluid medium is used having a specific resistivity of at least 10.sup.4 ohm-cm and is pumped through a tubular elongated electrode into the machining gap at a pressure of at least 20 kg/cm.sup.2, preferably 40 kg/cm.sup.2. An ultrasonic vibration is imparted to the elongated tubular electrode longitudinally thereof or transversely thereto.

REFERENCES:
patent: 3072777 (1963-01-01), McKechnie
patent: 3454737 (1969-07-01), Pfau et al.
patent: 3758739 (1973-09-01), DeJongh et al.
patent: 3928163 (1975-12-01), Ullmann et al.
patent: 3939321 (1976-02-01), Bertrand et al.
patent: 4208256 (1980-06-01), Inoue

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