| 摘要 |
<p>Apparatus or continuous extrusion of aluminium sheathing around a core cable includes a rotatable wheel having two identical circumferential grooves bounded by arcuate tooling discharging through radial exit apertures to an extrusion chamber positioned around a portal mandrel. The core cable is supplied through the mandrel and the aluminium sheathing is extruded as a loose fit from the extrusion chamber. The sheathing is discharged to a roller corrugator including a rotating frame mounted on a carriage provided with a roller arranged to form a continuous helical indentation in the sheathing. Actuating cylinders positioned on the carriage provide a constant, low magnitude, tension on the portion of the sheath intermediate the extrusion chamber and the roller corrugator and limit forces tending to distort the uncooled sheathing. The speed of the rotating frame is regulated in accordance with the linear speed of the cable to avoid unacceptable stretching of the sheath.</p> |
