Method and apparatus for carrying out a small hole by machining, by deep discharge electrical

摘要

P process and apparatus for machining electrical discharge of a deep hole having a diameter of about 1mm and whose ratio profondeurdiametre is at least equal to 5. / p & & p & it provides a thin tubular electrode 1 and the piece 11 is pierced by forming an interval of machining; it supplies a hydraulic fluid through the machining tubular electrode has the interval of machining under a pressure at least the same has 20kgcm; it applies a series of pulses of machining between the electrode and the tubular piece in order to cause electrical discharge spaced in the time in the range of machining, removing the material of the workpiece; and is caused to advance the tubular electrode, along its longitudinal direction, in the workpiece. / p