Moulding tool for producing a composite material part using a flexible preform composed of a skin and profiled preforms firmly attached to said skin

A molding tool for producing a composite material part by coating, using a matrix, a flexible preform composed of a skin with a fibrous structure, and, firmly attached to said skin, profiled flexible preforms with a fibrous structure, each comprising a core, arranged such that said cores delimit above the skin a plurality of three-dimensional meshes with polyhedral shapes, said molding tool comprising:

• a mold provided with a lower bearing plate, known as the lower bearing plate, suitable for supporting the skin of the preform, and a peripheral belt which delimits a volume suitable for accommodating said preform;
• for each three-dimensional mesh delimited by profiles, a part in a single piece for filling the volume of said mesh, formed by the assembly of:
• a plurality of wedges which are designed to be interlocked and form a wall for lining cores of the profiles, delimiting a free central volume inside the three-dimensional mesh;
• a blocking part which is suitable for being inserted in the free central volume of the three-dimensional mesh and for ensuring relative blocking of said blocking part and the wedges;
• and a counter-mold provided with a bearing plate, known as the upper bearing plate, for closure of the mold;
• this tool the mold and the counter-mold are made of a material which has at least substantially the same expansion coefficient as the fibrous structure of the preform, and in that the wedges and the blocking parts are made of a material which is designed to produce a part in a single piece with an expansion coefficient which is suitable for obtaining predetermined compacting of the skin and the profiles, for a predetermined temperature corresponding to the temperature of polymerization of the matrix.