Process for manufacturing a piece blading.

The present invention protects a method of manufacturing a piece of metal vane (1) of a turbomachine including a blade (14) at least comprises an inner cavity (13) and at least one hole (19) formed in the wall, communicating said cavity (13) with the exterior of said vane (14) by introduction into a mold of a core corresponding to said cavity (13) and casting a molten metal into the cavity of said mold casting, characterized in that the core (20) comprises, for each hole (19) communicating said cavity (13), a protuberance (22) projecting into the internal mold surface.