Continuous extrusion

Details Continuous extrusion Continuous extrusion

B - Operations, Transporting

21

C

B21C 23/00 (2006.01)

Patent

CA 2179717

A Conform machine has a rotatable wheel (1) with a con- tinuous groove C7) in a wall. A fixed shoe structure (9) associ- ated with the wheel (1) provides a passageway and an abutment (11) on the shoe structure (9) closes off one end of the pas- sageway. An extrusion die (13) leads from the passageway at or adjacent the abutment (11). The entire wheel (1) is located within a hood (19, 21) which is sealed except for apertures (27, 33, 25) for the feedstock (15), the extruded product (17) and the flash which is removed from the groove (7). A gaseous non- oxidising atmosphere is provided in the hood (19, 21) at a pressure greater than the atmosphere out- side of the hood. This prevents oxide and other contaminants en- tering into the extruded product (17).

Une machine Conform possède une roue rotative (1) pourvue d'une rainure continue (7) se trouvant dans une paroi. Une structure fixe de type sabot (9) associée à la roue (1) forme un passage, et un aboutement (11) de la structure sabot (9) ferme une extrémité du passage. Une matrice d'extrusion (13) s'étend à partir du passage au niveau ou à côté de l'aboutement (11). Toute la roue (1) se trouve sous un capot (19, 21) qui est hermétiquement fermé, mais qui possède des ouvertures (27, 33, 25) pour le passage de la charge de départ (15), du produit extrudé (17) et de la bavure qui est retirée de la rainure (7). Une atmosphère gazeuse, non oxydante créée sous le capot (19, 21) est à une pression supérieure à la pression de l'atmosphère à l'extérieur du capot. Ceci empêche l'oxyde et d'autres contaminants de pénétrer dans le produit extrudé (17).

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