Continuous extrusion apparatus

B - Operations – Transporting – 21 – C

Patent

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Details

B21C 23/00 (2006.01) B21C 23/08 (2006.01) B21C 23/30 (2006.01)

Patent

CA 2577776

Apparatus for continuous extrusion of an aluminium sheathing (56) free from imperfections or discontinuities on to a core cable a (58), such as an insulated copper cable, includes a rotatable wheel (2) formed with a pair of circumferential grooves (4), arcuate tooling (14) bounding radially outer portions of the respective grooves (4), a die body (22) provided with divergent exit apertures (34) discharging laterally to an extrusion chamber (36) through 90~ elbows (37) and short divergent passages (39) at diametrically opposed locations (35). An electrical induction heater (46) consists of coils of copper tubing connected to an electrical power source and to a coolant circulating means is positioned at a radially outer portion (48) of the die body (22) and is energisable to supply heat to the die body to maintain a uniform temperature of approximately 480~C, controlled by signals from thermocouples (50,52), around the extrusion chamber (36).

Appareil réalisant à l~extrusion continue d~un gainage en aluminium (56) exempt d~imperfections ou de discontinuités sur un câble à âme (58), un câble à cuivre isolé par exemple, comportant une roue pouvant tourner (2) formée avec une paire de rainures circonférentielles (4), des outils arqués (14) limitant radialement les parties externes des rainures respectives (4), un corps de matrice (22) doté d~ouvertures de sortie divergentes (34) débitant latéralement vers une chambre d~extrusion (36) par des coudes à 90° (37) et des passages divergents courts (39) à des endroits diamétralement opposés (35). Un radiateur électrique à induction (46) composé de spirales de tube en cuivre reliées à une source d~alimentation électrique et à un moyen de circulation de liquide de refroidissement est positionné au niveau d~une partie radialement externe (48) du corps de matrice (22) et peut être mis sous tension pour alimenter de la chaleur au corps de matrice afin de maintenir une température uniforme d~environ 480°C, gérée sur la base des signaux venant des thermocouples (50, 52), autour de la chambre d~extrusion (36).

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