Variable cross section extruding die and variable cross...

B - Operations – Transporting – 21 – C

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B21C 25/08 (2006.01)

Patent

CA 2188249

A variable cross section extruding die comprises a die for varying an area of an extrusion molding hole provided movably in a direction perpendicular to a direction in which a molding material is extruded for extrusion of the molding material and a mandrel provided in the extrusion molding hole in such a manner as to freely move back and forth in the above extruding direction and having a tapered portion on its outer circumferential portion tapered such that the outer diameter thereof gets gradually smaller from one of the back and forth directions to the other. With this variable cross section extruding die, while a molding material is being pressed against the die, the die is moved such that the configuration of the extrusion molding hole is deformed, and the tapered portion of the mandrel is moved in and out of the extrusion molding hole, whereby a tubular molded article is extruded whose outside and inside diameters vary along its longitudinal direction.

La matrice à extrusion à section variable selon l'invention comprend une filière (24) permettant de faire varier l'ouverture de l'orifice de filage (31), montée de telle manière qu'elle peut se déplacer à la perpendiculaire de l'axe d'extrusion du matériau à extruder, ainsi qu'un mandrin (27) monté dans l'orifice de filage de telle manière qu'il peut avancer et reculer dans l'axe d'extrusion. Le mandrin présente (27B) sur son pourtour circonférentiel une partie conique de sorte que son diamètre extérieur va en diminuant à mesure que l'on progresse de l'arrière vers l'avant de l'axe aller-retour. Alors que le matériau à extruder est pressé contre la filière (24), la matrice se déplace de telle manière que la configuration de l'orifice de filage s'en trouve déformée, que la partie conique du mandrin (27) a un mouvement d'entrée et de sortie par rapport à l'orifice de filage et que l'article extrudé présente une forme tubulaire dont les diamètres extérieur et intérieur varient dans le sens longitudinal.

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