FIELD: manufacture of hollow blade of gas-turbine engine, namely formation of straight passages for cooling air in wall of blade of gas-turbine engine.
SUBSTANCE: apparatus includes at least one shaping electrode secured to first electrode holder and designed for making enlarged outlet opening. Shaping electrode includes back end portion for mounting in holder, mean portion with constant cross section and front pointed end portion with cross section area lowering in zone from mean portion until apex of shaping electrode. Shaping electrode has surface with guiding groove for rectilinear electrode designed for forming straight portion of passage for cooling air. Apparatus also includes unit for moving electrode holder.
EFFECT: possibility for using electrodes of simple configuration, lowered cost for making passages for cooling air.
11 cl, 6 dwg
