Article, method and apparatus of forming expanded plastic...

B - Operations – Transporting – 29 – C

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B29C 44/34 (2006.01) B29C 44/58 (2006.01) B29C 45/00 (2006.01)

Patent

CA 2550836

The invention provides an article, a method and an apparatus of forming expanded plastic materials in a steam chest mold having out of die draw features. This is achieved by means of a cavity pull system. The cavity pull system allows for the provision of molded features outside the die draw and is designed to operate on a cam type system using two stainless steel rods running at a right angle to one another. A gear mechanism allows molded features, e.g. holes, to be formed at any angle on any part design where enough part geometry exists to accommodate the forming features and in the tool for mechanism components. The invention is advantageously employed in the formation of holes outside the die draw in vertically stacked injection tools for energy absorbers used in vehicle bumper fascias. The provision of out of die draw molded features is useful for fascia component locating or attachment.

L'invention porte sur un article, sur un procédé et sur un appareil de formation de matières plastiques expansées dans un moule en enceinte à vapeur possédant des caractéristiques de filage de sortie de filière. On utilise, en l'occurrence, un système de tirage à cavité. Le système de tirage à cavité permet de former des dispositifs moulés à l'extérieur de la filière et est conçu pour fonctionner sur un système de type à came au moyen de deux tiges en acier inoxydable travaillant perpendiculairement l'une par rapport à l'autre. Un engrenage permet de former des dispositifs moulés tels que des trous à un angle quelconque sur n'importe quel modèle de pièce, dans la mesure où la géométrie de la pièce et de l'outillage le permettent. L'invention convient particulièrement à la réalisation de trous à l'extérieur de la filière dans des outils d'injection en empilement vertical destinés à des amortisseurs de boucliers pare-chocs de véhicules. L'invention convient à la mise en place et à la fixation des composants de boucliers de pare-chocs.

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