Method for producing single- or multi-layered fibre preforms...

B - Operations – Transporting – 29 – C

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Details

B29C 33/30 (2006.01) B29B 11/16 (2006.01) B29C 70/38 (2006.01)

Patent

CA 2615874

The invention relates to a method for producing single-- or multi-layered fibre preforms 1,17 by the TFP process with fibre strands 2-8, 18 which are aligned in particular such that they are oriented with the flux of force, wherein the fibre preforms 1, 17 have virtually any desired material thickness without troublesome backing layers and have virtually any desired surface geometry, comprising the steps of: - laying and attaching the fibre strands 2 to 8, 18 on a flexible and elastic base 9, 19, in particular a base 9, 19 formed by an elastomer, with a fixing thread 10, 11 led through a sewing head to form the fibre preform 1, 17 and - lifting the fibre preform 1, 17 off the elastic and flexible base 9, 19. The fibre preforms 1, 17 produced by means of the method according to the invention have a virtually optimum fibre alignment, that is to say substantially oriented with the flux of force, and no appreciable flaws in the arrangement of fibres, and consequently make it possible to create composite components that can withstand extreme mechanical stress and are at the same time lightweight, for example by subsequent processing in the RTM process.

L'invention concerne un procédé pour produire des ébauches fibreuses monocouches ou multicouches (1, 17) au cours d'un procédé TFP, au moyen de brins de fibre (2-8, 18) qui sont en particulier orientés en fonction d'un flux de force. Selon l'invention, les ébauches fibreuses (1, 17) présentent une épaisseur de matière plus ou moins quelconque, sans couche de support perturbatrice, ainsi qu'une géométrie superficielle plus ou moins quelconque. Le procédé selon l'invention comprend les étapes qui consistent : à déposer et fixer les brins de fibre (2-8, 18) sur un substrat souple et élastique (9, 19), en particulier un substrat (9, 19) en élastomère, au moyen d'un fil de fixation (10, 11) guidé par une tête de couture, pour former l'ébauche fibreuse (1, 17), et ; à retirer l'ébauche fibreuse (1, 17) disposée sur le substrat souple et élastique (9, 19). Les ébauches fibreuses (1, 17) produites à l'aide du procédé selon l'invention présentent une orientation de fibre quasi-optimale, c'est-à-dire sensiblement déterminée par un flux de force, ne comportent aucune imperfection significative dans la disposition des fibres, et permettent ainsi de générer des composites pouvant supporter une sollicitation mécanique extrême malgré leur légèreté, par exemple au moyen d'un traitement subséquent au cours d'un procédé RTM.

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