Tool for moulding self-stiffened panels made from a...

B - Operations – Transporting – 29 – C

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18/1202

B29C 33/38 (2006.01) B29D 99/00 (2010.01) B29C 70/42 (2006.01) B29C 70/44 (2006.01) B29C 43/12 (2006.01)

Patent

CA 2002302

For moulding self-stiffened panels (A) from a composite material with a thermosetting matrix, use is made of a tool comprising a block (10), a sealing bag (12), whose peripheral edge is connected to the block by a sealing bead (14), and solid, non-deformable calibration parts (22). Panel (A) is placed in a tight volume (16) defined between the block and the bag, whilst the parts (22) are placed outside said volume, above the bag and between the panel stiffeners (C). The calibration parts (22) are connected by a rigid structure (24). Thus, when the volume (16) is placed under a vacuum and when the tool is placed in an oven or autoclave, a uniform pressure is applied to the panel by the bag (12) and the parts (22) ensuring the maintenance of the geometry of the stiffeners.

Pour procéder au moulage de panneaux (A) à raidisseurs incorporés en utilisant un matériau composite et une matrice thermodurcissable, on fait appel à un instrument constitué d'un bloc (10), d'un sac scellable (12), dont le bord périphérique est relié au bloc par un cordon de fermeture (14), et de pièces d'étalonnage (22) solides et non déformables. Le panneau (A) est placé dans un espace volumétrique restreint (16), délimité par le bloc et le sac, les pièces (22) étant placées à l'extérieur du volume en question, au-dessus du sac et entre les panneaux à raidisseurs incorporés (C). Les pièces d'étalonnage (22) sont reliées entre elles par une structure rigide (24). De cette manière, lorsqu'on place ce volume (16) sous vide et que l'instrument est mis au four ou dans un autoclave, le sac (12) et les pièces d'étalonnage (22) exercent une pression uniforme sur le panneau et assurent la conservation de la structure géométrique des raidisseurs.

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