Process for manufacturing subsequently forged castings that...

B - Operations – Transporting – 22 – D

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B22D 27/11 (2006.01) B21J 5/00 (2006.01) B21J 5/02 (2006.01) B22D 15/00 (2006.01) B22D 31/00 (2006.01)

Patent

CA 2366026

This method is original in that it implements the following phases: - a foundry preform is created that includes one or more pierced or blind recesses or cavities that match the useful or required shapes of the end part to be obtained; - the preform is transferred to a tunnel furnace that ensures a uniform temperature of said preform; - the foundry preform is positioned in a heading die disposed on a press; - one or more multidirectional rods are introduced into the recess(es) or cavity(ies) of the foundry preform, according to a command prior to the forging operation; - sizing operation of the preform that receives the rod(s) in the phase during which the rod(s) are temporarily positioned inside the shaped recess(es). the upper forging die is raised to free the forged preform; - the rod(s) positioned in the recess(es) are withdrawn; - the rod(s) positioned in the recess(es) are withdrawn; - the forged preform is removed.

Ce procédé est remarquable en ce qu'il met en oeuvre les phases suivantes : - réalisation d'une préforme de fonderie incluant un ou des évidements ou cavités débouchants ou borgnes, correspondant à des formes utiles ou recherchées de la pièce finie à obtenir ; - transfert de la préforme dans un four tunnel assurant l'homogénéisation en température de ladite préforme ; - positionnement de la préforme de fonderie dans une matrice de frappe disposée sur une presse ; - introduction d'une ou de plusieurs broches multidirectionnelles dans le ou les évidements ou cavités de la préforme de fonderie, selon une commande manuelle précédant l'opération de forgeage ; - opération de frappe de la préforme réceptrice de la ou des broches pendant la phase de positionnement temporaire de la ou des broches à l'intérieur du ou des évidements formés ; - remontée de la matrice supérieure de forgeage pour libérer la préforme forgée; - retrait de la ou des broches placées dans le ou les évidements ; - déchargement de la préforme forgée.

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