The cable is a bundle of several strands or optical fibers isolated from each other, enclosed in one sheath. Today, the cable manufacturing process is divided into several stages: drawing, broaching, insulation, coiling and shipping.
Instructions
Step 1
All primary operations for the manufacture of cables are carried out in the workshops for drawing and twisting strands. A strand is a workpiece twisted from several copper wires. In this workshop, the primary processing of wire rod is carried out, which is a viscous material obtained from metal and looks like a small bar with a diameter of 5-10 mm.
Step 2
After the blanks are made, they are sent to the sheathing and insulation workshop. Copper rod is drawn into wire using special machines. Drawing is a process of cold working of metals, in which a wire or other workpiece passes through a drawing (drawing tool) and takes the required shape and dimensions. Drawing impairs the electrical conductivity and changes the plastic properties of the metal.
Step 3
To restore the electrical conductive properties of the metal, annealing is performed, the temperature and duration of which depends on the properties of the wire being produced and its dimensions. The process is carried out in vacuum or steam ovens.
Step 4
The finished egg (a set of several wires) is wound on a special technological reel. After that, the milk is fed to the stranding machine, where strands are formed - blanks for the production of wires. Individual wires are also used to twist conductors and bare wires.
Step 5
To apply a sheath on twisted wires, PVC-compound is used. First, its granules are melted to a homogeneous mass and, using a special press (extruder), are applied to the wire. In the manufacture of stranded wire, insulated conductors are twisted and guided to apply a common insulating material.
Step 6
After all operations have been completed, the cables are packed and sent for shipment.
