Production of large composite structures

B - Operations – Transporting – 29 – C

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B29C 70/36 (2006.01) B29C 43/02 (2006.01) B29C 43/36 (2006.01) B29C 70/44 (2006.01) B29C 70/48 (2006.01) B29C 70/54 (2006.01) B29C 33/76 (2006.01)

Patent

CA 2223779

Large composite structures are produced using a vacuum assisted resin transfer molding process incorporating a resin distribution network. The resin distribution network is provided by a textured sheet (104) of metal formed as an integral vacuum bag and mold. The texture is formed by upraised portions (108) on one side of the sheet which correspond with depressions on the other side. Valleys between the upraised portions form the resin distribution network. A fiber lay up is placed against the textured sheet (104) with the upraised portions facing the lay up. Main feeder grooves (114) are also formed directly in the sheet (104). Resin is supplied under vacuum to the main feeder grooves, from where it travels through the valleys of the textured sheet (104) to impregnate the lay up.

Ces structures composites de grandes dimensions sont produites au moyen d'un procédé de moulage par transfert de résine sous vide, avec un réseau de distribution de la résine. Ce réseau est obtenu à partir d'une plaque métallique structurée (104) se présentant sous forme d'un sac sous vide et d'un moule qui constituent une seule pièce. La structure est formée par des parties surélevées (108) sur l'une des faces de la plaque qui correspondent avec des évidements sur l'autre face. Des sillons entre les parties surélevées forment le réseau de distribution de la résine. Une superposition de fibres est placée contre la plaque structurée (104), les parties surélevées faisant face à cette superposition. Des gorges d'alimentation principales (114) sont formées directement dans la plaque (104). La résine est acheminée sous vide vers les gorges d'alimentation principales, d'où elle circule à travers les sillons de la plaque structurée (104) pour imprégner la superposition de fibres.

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