Method for manufacturing composite parts, manufacturing facility implementing such a method, and composite parts manufactured thereby

A method for manufacturing composite material parts with preforms obtained by contour weaving of a kind comprising rolling up at least one part of drape by weaving or by braiding around a mandrel under a field of determined tensions, said method comprising:

• during a first phase, carrying out a design of the part, a calculation of a geometry and the drape layout of a fabric-made preform and a calculation of at least one mandrel for forming a first manufacturing state of at least one preform;
• during a second phase, carrying out a production of said at least one mandrel, calculated during the first phase, and of the drape of said at least one preform to be rolled up on said at least one mandrel;
• during a third phase, extracting said at least one preform from the corresponding mandrel and applying thereto a determined radial extension, and/or, beyond an inflection point on the rolled up preform and/or into the radial extension, a determined geometric transformation which makes said at least one preform pass from a first manufacturing state to a second and last manufacturing state;
• and
• carrying out the impregnation of said at least one preform in order to obtain the desired composite material parts.