Method for producing a turbomachine blade made from a composite material

A method of fabricating a composite-material turbomachine blade having a bottom or top platform incorporated therein, the method comprising:

• separately making a blade platform element that comprises rigidified fiber reinforcement and that has a shape close to the shape of a platform of the blade that is to be fabricated, with at least one opening being formed through the platform element, the opening having the shape of the profile of the airfoil of the blade that is to be fabricated;
• using three-dimensional weaving to make a flexible fiber blank as a single piece that includes blade airfoil-and-root preform portions;
• engaging the platform element via its opening on the flexible fiber blank while deforming it so as to assemble the platform element with the fiber blank;
• shaping the fiber blank together with the platform element assembled thereon in order to obtain a blade preform of a shape that is close to the shape of the blade that is to be fabricated;
• after shaping, consolidating the blade preform in its shape in a shaper;
• and
• performing final densification of the consolidated blade preform in order to obtain a composite-material blade having an incorporated platform.

A method of fabricating a composite-material turbomachine blade having a bottom or top platform incorporated therein, the method comprising:

• separately making a bottom or top blade platform element that comprises rigidified fiber reinforcement and that has a shape close to the shape of a platform of the blade that is to be fabricated, with a plurality of openings being formed through the platform element, the openings having the shape of the profile of the airfoil of the blade that is to be fabricated;
• using three-dimensional weaving to make a plurality of fiber blanks as single pieces, each comprising respective blade airfoil-and-root preform portions;
• engaging the platform element via its openings simultaneously on the flexible fiber blanks while deforming it so as to assemble the platform element with the fiber blanks;
• shaping the fiber blanks together with the platform element assembled thereon in order to obtain a blade preform of a shape that is close to the shape of the blade that is to be fabricated;
• after shaping, consolidating the blade preform in its shape in a shaper;
• and
• performing final densification of the consolidated blade preform in order to obtain a composite-material blade having an incorporated platform.