Method for manufacturing a part of cylindrical shape made from stiffened thermoplastic composite material

A method for manufacturing a part of cylindrical shape made from stiffened thermoplastic composite material, the method comprising:

• positioning a precursor assembly of the part to be manufactured in a vacuum molding tool, the assembly being made of thermoplastic preimpregnated fibrous material and comprising (i) a sectorized cylinder formed by panels juxtaposed around an axis of the cylinder, and (ii) stiffening elements assembled on each of the panels and present on an internal surface of the cylinder,
• the tool comprising an internal part lined with a vacuum bag, facing the internal surface of the cylinder and stiffening elements, on which the assembly is positioned, and an external molding part of cylindrical shape, facing an external surface of the cylinder, and
• the conformation of the assembly on the external molding part and the formation of the part by co-consolidation of the stiffening elements and the cylinder, comprising:
• heating the assembly during which a vacuum is drawn in the molding tool so that the vacuum bag applies pressure to press the stiffening elements against the internal surface of the cylinder and shape the assembly against the external molding part, and during which the thermoplastic resin(s) present in the assembly are melted or softened, and
• cooling the assembly, after said heating, during which the temperature is reduced to set the shape of the assembly thus produced and obtain the composite material part to which the stiffening elements are secured.