Societe Nationale D'etude Et De Construction De Moteurs D'aviation

Gilles Charles Klein

Gilles Michel Calle

Ludovic Edmond Molliex

Andre C Collot

Xavier Jean Guyonnet

Philippe Louis Alassoeur

In a process for the manufacture of a hollow turbomachine blade in which die-forged and machined sheets are assembled and diffusion welded face to face after applying an antidiffusion coating to areas of the sheets where the assembly is to be expanded in forming the hollow blade, the welded assembly is subjected to a step of unsticking the coated areas of the sheets which are pressed together during the diffusion welding step, the unsticking step including subjecting the assembly to localized heating in a region where the intermediate sheet is provided with intercavity communication holes, and injecting pressurized gas into the welded assembly in a controlled manner to hot form a gas distribution duct in the locally heated region of the assembly to facilitate unsticking of the remainder of the coated areas. Apparatus for use in carrying out the unsticking step is also described.

Process for the manufacture of a hollow turbomachine blade and apparatus

In a method of manufacturing a hollow blade for a turbomachine in which a plurality of primary sheet-like parts having anti-diffusion coatings in predefined areas are assembled face to face and diffusion welded together before being deformed to shape by pressurized gas and superplastic forming. The assembly, before being diffusion welded together, is subjected to a preheating treatment in an oven to remove the binder from the anti-diffusion coatings, and then, without moving the assembly, the interior of the assembly is evacuated while simultaneously progressively increasing the temperature at a rate V to a value T to produce a permanent plastic deformation of the parts, the interior of the assembly then being maintained in vacuo at the temperature T while an isostatic pressure is applied to the exterior of the assembly so as to produce a compacting of the anti-diffusion material and a prewelding of the facing areas which are not coated with the anti-diffusion material.

Method of manufacturing a hollow blade for a turbomachine

A method of producing a fibre-reinforced metallic circular part having a tral hollow, wherein the reinforcing fibres are disposed in the part in the vicinity of the hollow, comprises providing an annular metallic blank with a channel-sectioned groove opening towards the axis of the blank, placing uncompressed concentric layers of the reinforcing fibres and additional metal alternately in the groove followed by a more rigid expansion ring, evacuating the groove and sealing it by a deformable closure member which covers the groove, placing this assembly in an autoclave and subjecting it to a temperature and pressure sufficient to effect superplastic forging of the layers of additional metal whereby the fibre layers and the additional metal layers are compressed and welded to the blank in a single operation, and machining the resulting assembly to obtain the required shaped part.

Growing community of inventors

Mery/Oise, France

Gilles Charles Klein