| 摘要 |
<p>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).</p> |
