Method for producing structures of complex shapes of...

Details Method for producing structures of complex shapes of... Method for producing structures of complex shapes of...

B - Operations, Transporting

29

C

B29C 70/44 (2006.01) B29C 33/38 (2006.01) B29C 33/50 (2006.01)

Patent

CA 2649599

The invention concerns a method for producing a composite material part having a so-called non-strippable shape which consists in producing mold components, or cores, which are to be extracted from the part after the composite material has been cured. The method consists in a first step in producing a core from an elastomeric bladder (21) the desired shape of which is obtained by filling the bladder with a granular solid material (31) and in depressurizing the bladder and in a second step, after setting the core and the composite material (12) in modifying in controlled manner the volume of the core for example by selecting the solid granular material based on its thermal expansion properties or by acting on the pressure in the bladder.

Pour réaliser une pièce en matériau composite dont la forme est dite non démoulable il est nécessaire de réaliser des éléments de moule dit noyaux qui doivent être extrait de la pièce après le durcissement du matériau composite. Le procédé consiste dans une première étape à réaliser un noyau à partir d'une vessie en élastomère (21) dont la forme voulue est obtenue en remplissant la vessie avec un matériau solide granulaire (31) et une mise en dépression de la vessie et dans une seconde étape, après la mise en place du noyau et du matériau composite (12) a modifier de manière contrôlée le volume du noyau par exemple en sélectionnant le matériau solide granulaire pour ses propriétés de dilatation thermique ou en agissant sur la pression dans la vessie.

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