Method of fabricating a blade platform out of composite material with integrated gaskets for a turbine engine fan

A method of fabricating a blade platform out of composite material with integrated gaskets for a turbine engine fan, the platform comprising a base extending along a longitudinal direction and presenting two opposite faces and a stiffener that extends from one of the faces of the base, the method comprising:

• using three-dimensional weaving to make a single-piece fiber blank with a plurality of longitudinal yarn layers extending in a direction corresponding to a longitudinal direction of the base of the platform and interlinked by yarns of a plurality of transverse yarn layers, while leaving between the longitudinal yarn layers two main zones of non-interlinking that are open, each extending from a side edge of the fiber blank for the purpose of forming a stiffener preform;
• shaping the fiber blank to form a fiber preform having a first portion forming a base preform and a second portion forming a stiffener preform;
• positioning platform gaskets at side margins of the first portion of the fiber preform forming a base preform;
• placing the fiber preform with the gaskets in an injection mold;
• injecting resin into the injection mold;
• compacting the assembly;
• heating the injection mold to solidify the resin;
• and
• unmolding the resulting platform,
• wherein the gaskets are assembled to the side margins of the first portion of the fiber preform forming a base preform by stitching prior to the step of placing the fiber preform in the injection mold.

A method of fabricating a blade platform out of composite material with integrated gaskets for a turbine engine fan, the platform comprising a base extending along a longitudinal direction and presenting two opposite faces and a stiffener that extends from one of the faces of the base, the method comprising:

• using three-dimensional weaving to make a single-piece fiber blank with a plurality of longitudinal yarn layers extending in a direction corresponding to a longitudinal direction of the base of the platform and interlinked by yarns of a plurality of transverse yarn layers, while leaving between the longitudinal yarn layers two main zones of non-interlinking that are open, each extending from a side edge of the fiber blank for the purpose of forming a stiffener preform;
• shaping the fiber blank to form a fiber preform having a first portion forming a base preform and a second portion forming a stiffener preform;
• positioning platform gaskets at side margins of the first portion of the fiber preform forming a base preform;
• placing the fiber preform with the gaskets in an injection mold;
• injecting resin into the injection mold;
• compacting the assembly;
• heating the injection mold to solidify the resin;
• and
• unmolding the resulting platform,
• wherein the gaskets are placed in the injection mold against the side margins of the first portion of the fiber preform forming the base preform without being mechanically connected thereto, and
• wherein each longitudinal end of the base of the platform is folded inward so as to present a step, and the gaskets extend between the steps in the longitudinal direction.