Method for making a moulding core, and moulding core for...

B - Operations – Transporting – 29 – C

Patent

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

Patent

CA 2707111

In order to make a structure of a composite material including elongated hollow shapes, such as hollow shapes associated with stiffeners of a stiffened panel, the invention comprises making cores including a bladder made of an elastomer material. The invention relates to a method for making such extractible cores in order to obtain cores having a very important length, and allowing the use of said cores for the industrial production of composite parts. The bladder is a cylindrical bladder that is conformed in a core mould, wherein the core itself does not have to be cylindrical, before being filled with a granular material and submitted to a negative pressure in order to impart a stable shape to the core by compaction of the granular material.

Image Pour réaliser une structure en matériau composite comportant des formes creuses allongées telles que des formes creuses associées à des raidisseurs d'un panneau raidi, des noyaux (1) comportant une vessie (2) en élastomëre sont réalisés. L'invention concerne un procédé de réalisation de tels noyaux extractibles afin d'obtenir des noyaux de très grande longueur et permettant l'utilisation de ces noyaux pour une fabrication industrielle de pièces composites. La vessie est une vessie cylindrique qui est conformée dans un moule à noyau, le noyau n'étant pas lui-même nécessairement cylindrique, avant d'être remplie d'un matériau granulaire (3) et mise en dépression pour donner au noyau une forme stable par compactage du matériau granulaire.

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