TOOL-ELECTRODE CAPABLE OF PRODUCING SEALING SLOTS IN A CMC MATERIAL BY MEANS OF EDM

The invention relates to a tool-electrode for machining a recess in a conductive part by spark machining of the die-sinking type. Said tool-electrode comprises a conductive body having opposing lower and upper surfaces, two opposing main side surfaces, lower and upper regions that are stacked in a die-sinking direction of the tool-electrode, the lower region comprising the lower surface and part of the main side surfaces, the upper region comprising the upper surface and the other part of the main side surfaces. The body is provided, at least in the lower region, with a plurality of openings chosen from channels or slots; a channel is an opening that opens onto at least one of the upper and lower surfaces; a slot is an opening that opens onto the lower surface and onto the two main side surfaces; the diameter of each channel and the distance between two side walls of each slot is ≤ twice the die-sinking machining gap; each slot has a height, in the die-sinking direction, that is ≥ three times the depth of the recess to be made.