Molding composite objects

B - Operations – Transporting – 22 – D

Patent

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Details

B22D 19/08 (2006.01) B22C 13/08 (2006.01) B29C 45/14 (2006.01) B29C 71/02 (2006.01)

Patent

CA 2432481

Methods for molding a surround over a liner to form a composite shell are provided. The liner is placed in a mold and molten surround material is injected into the mold so as to surround the liner. A surface of a protrusion of the liner abuts the mold so that the surface is exposed and is substantially flush with an exterior surface of the surround after the composite shell is removed from the mold. Molten surround material flows into a slot in a perimeter of the protrusion so that when the surround material solidifies, a rib of surround material extends into the slot to form a pressure seal between the liner and the surround. An adhesive is applied to the liner before placing the liner in the mold for reducing relative movement between the liner and surround as the surround material solidifies and the liner and surround cool.

Cette invention concerne des méthodes permettant de mouler une enveloppe par-dessus une doublure, pour former une coquille composite. La doublure est placée dans un moule et le matériau en fusion de l'enveloppe est injecté dans le moule, de façon à entourer la doublure. Une surface d'une protrusion de la doublure aboute le moule de manière à ce que la surface soit exposée et substantiellement au ras d'une surface extérieure qui l'entoure après que la coquille composite soit sortie du moule. Le matériau de bordure en fusion s'écoule directement dans une fente, dans un périmètre de la protrusion, de sorte que lorsque ce matériau se solidifie, une nervure de matériau de bordure s'étend dans la fente pour former un joint sous pression entre la doublure et le matériau qui l'entoure. Un adhésif est appliqué sur la doublure avant qu'elle ne soit placée dans le moule pour réduire le mouvement relatif entre la doublure et le matériau de bordure lorsque ce dernier se solidifie et que la doublure et la bordure refroidissent.

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