METHOD FOR MANUFACTURING A PREFORM FOR COMPOSITE MATERIALS

• Main Authors: DEPEUX, Fabien, DESJOYEAUX, Bertrand, PROVOST, Benjamin, LOUCHARD, Sébastien
• Format: Patent
• Language: English; French
• Published: 11.01.2018
• Subjects: AEROPLANES; AIRCRAFT; AVIATION; COSMONAUTICS; HELICOPTERS; MAKING GRANULES OR PREFORMS; PERFORMING OPERATIONS; PREPARATION OR PRETREATMENT OF THE MATERIAL TO BESHAPED; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIALCONTAINING PLASTICS; TRANSPORTING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

A method for manufacturing a preform having a non-developable end shape comprising, about a longitudinal axis (A), an end overall radius of curvature (R2), and, in at least a longitudinal section, curved segments (16, 30, 32) forming bending radii linking straight segments (2, 4, 6, 12, 20, 22), said method comprising a step of depositing successive layers giving the preform an initial substantially rotational shape having, about the longitudinal axis (A), an initial overall radius of curvature, then a step of deploying the preform by increasing the initial overall radius of curvature until the end overall radius of curvature is reached (R2), in order to close the bending radii of the curved segments. Procédé de fabrication d'une préforme présentant une forme finale non développable comprenant autour d'un axe longitudinal (A) un rayon global de courbure final (R2), et dans au moins une section longitudinale des tronçons courbes (16, 30, 32) formant des rayons de pliage reliant des tronçons rectilignes (2, 4, 6, 12, 20, 22), ce procédé comportant une étape de dépose de couches successives donnant à la préforme une forme initiale sensiblement de révolution présentant autour de l'axe longitudinal (A) un rayon global de courbure initial, puis une étape de déploiement de la préforme en augmentant le rayon global de courbure initial jusqu'au rayon global de courbure final (R2), afin de refermer les rayons de pliage des tronçons courbes.