Preform intended to form a hollow structural mechanical...

B - Operations – Transporting – 29 – B

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B29B 11/16 (2006.01) B29C 70/24 (2006.01) D03D 25/00 (2006.01)

Patent

CA 2727360

The invention relates to a preform (300) intended to form a hollow structural mechanical part, said preform (300) comprising: a central body (301) forming a median plane (307) and extending substantially along a main axis (309) contained in the median plane (307); and two side parts (303, 305) extending substantially along the median plane (307) along a secondary axis (311) substantially perpendicular to the main axis (309), the central body (301) and each side part (303, 305) including weft fibres interconnected by binder fibres. The weft fibres extend along substantially parallel planar weft layers, and the thickness (E) of each side part (303, 305) decreases along the secondary axis (311) moving away from the central body (301). The invention also relates to a method for producing one such preform, as well as to a hollow structural mechanical part.

L'invention se rapporte à une préforme (300) destinée à former une pièce mécanique structurante creuse, ladite préforme (300) comprenant un corps central (301) formant un plan moyen (307) et s'étendant sensiblement suivant un axe principal (309) contenu dans le plan moyen (307), et deux parties latérales (303, 305) s'étendant sensiblement suivant le plan moyen (307) selon un axe secondaire (311) sensiblement perpendiculaire à l'axe principal (309), le corps central (301) et chaque partie latérale (303, 305) comprenant des fibres de trame liées entre elles par des fibres de liaison, lesdites fibres de trame s'étendant suivant des couches de trame planes sensiblement parallèles entre elles, l'épaisseur (E) de chaque partie latérale (303, 305) diminuant en s'éloignant du corps central (301) selon l'axe secondaire (311). L'invention se rapporte également à un procédé de fabrication d'une telle préforme ainsi qu'à une pièce mécanique structurante creuse.

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