ELECTRIC SPARK MACHINING OF METALS Russian patent published in 2011 - IPC B23H1/00 B23H9/06 

FIELD: process engineering.

SUBSTANCE: invention may be used for surface doping, sheet marking, and producing data and decorative patterns. Proposed method comprises displacing the electrode at potential relative to machined part to come in intermittent contact with the latter. Note here that said electrode is revolved about its axis and displaced along machined part surface at the angle to the latter. Method rules out fixation of distance between electrode and part, reduced vibration of electrode.

EFFECT: longer life and expanded performances.

4 dwg