Copper, aluminum single wire drawing, wire and cable. Common copper, aluminum rod material, at room temperature, the use of Wire Drawing Machine through one or several lines of drawing die hole, so that its section is reduced, length increased, strength increased. Wire drawing is the first process of each wire and cable company. The main technological parameter of wire drawing is die matching technology.
2. Annealing of single wire. When the copper and aluminum single wire is heated to a certain temperature, recrystallization is used to improve the toughness of the single wire and reduce the strength of the single wire, so as to meet the requirements of wire and cable for conductor core. The key of annealing process is to prevent oxidation of copper wire.
3. Wringing of conductors. In order to improve the softness of wires and cables and facilitate laying and installation, the conductor core is made of several single strands. The twisted form of conductor core can be divided into regular twisted and irregular twisted. Irregular skewing can be divided into bundle skewing, concentric wringing, special skewing, etc. In order to reduce the area occupied by the conductor and reduce the geometry size of the cable, the compact form is adopted while the conductor is twisted, so that the ordinary circle is changed into semicircle, sector, tile and compact circle. This conductor is mainly used in power cables.
4. Insulation extrusion: Plastic wire and cable mainly adopts extruded packing solid insulation layer. Main technical requirements of plastic insulation extrusion.
A. Degree of eccentricity: The deviation value of extruded insulation thickness is an important symbol to reflect the level of extrusion technology. Most product structure size and deviation value are clearly specified in the standard.
B Smoothness: The surface of the extruded insulation layer shall be smooth, and the surface shall not be rough, charred, or impurities with poor quality.
C Densification: The cross section of the extruded insulation layer should be compact and strong, not visible, and the existence of bubbles should be eliminated.