Although the production process of high temperature wires is similar to the production process of ordinary wires, because the performance requirements of high temperature wires are higher than the performance requirements of ordinary wires, the production of high temperature wires is more stringent. specification. Swell high-temperature wire production process generally has the following steps:
First, copper monofilament drawing
The copper rods commonly used for high-temperature wires use a wire drawing machine to stretch the die holes of one or more passes at normal temperature to reduce the cross-section, increase the length, and increase the strength.
Wire drawing is also the first process of producing wires. The main process parameter of wire drawing is die matching technology.
Stranding of conductors
In order to improve the softness of high-temperature wires and facilitate the installation, the conductor is usually made by twisting multiple single copper wires. From the twisted form of the conductor, it can be divided into regular twisted and irregular twisted.
Irregular twisting is further divided into bundle twisting, concentric retwisting, special twisting and so on.
Three, monofilament annealing
Copper monofilament is heated to a certain temperature to increase the toughness and reduce the strength of the monofilament by recrystallization to meet the requirements of high-temperature wires for conductors.
The key to the annealing process is to prevent the oxidation of copper wires.
Fourth, insulation extrusion
High-temperature wires are also plastic wires. They are mainly packed with solid insulation. The main technical requirements for plastic insulation extrusion are:
a. Eccentricity: The deviation of the thickness of the extruded insulation is an important indicator of the level of the extrusion process. Most of the product structure dimensions and their deviations are clearly specified in the standard.
b. Smoothness: The surface of the extruded insulation layer must be smooth, and there must be no bad quality problems such as rough surface, burnt, and impurities.
c. Density: The cross section of the extruded insulation layer must be dense and strong, and pinholes visible to the naked eye must not be allowed to prevent the presence of air bubbles.
Five, into a cable
For multi-core high-temperature wires, in order to ensure the degree of molding and reduce the shape of high-temperature cables, they are generally twisted into a circle. The twisting mechanism is similar to that of conductor twisting. Due to the large diameter of the twisted joint, most of the twist-free methods are used.
Technical requirements for cabling: First, to prevent twisting of the cable caused by the turning of the shaped insulation core; second, to prevent the insulation layer from being scratched.