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Continuous casting and rolling process of aluminum alloy rod
The excellent aluminum alloy conductor rod is the decisive factor of the electrical and mechanical properties of the aluminum alloy cable, and the stable production of the aluminum alloy rods which meet the requirements is mainly from the following links.
1 calculate and determine the use of aluminum ingots, intermediate alloy and additives, in turn, after melting into the heat preservation furnace, add additive refining and stirring, at the same time, the different points in the furnace sampling analysis, need to make corresponding adjustments.
2 due to high temperature after refining the alloy, aluminum crystallization is more difficult, pay attention to adjust the cooling water pressure at any time, keep the crystal round smooth, so that the smooth crystallization of aluminum liquid. 3 The tensile strength and elongation of the aluminum rod are strictly controlled during rolling, which is convenient for subsequent drawing and stranding.
Because the aluminum rod has internal stress to store for more than 48 hours to use.
The pressing process of conductor Aluminum alloy cable conductor using 8000 series aluminum alloy, the use of special compression technology, in order to control the diameter of the cable, The general compression coefficient is controlled above 0.92, through the maximum limit of the tight pressure, to make up for the shortage of aluminum alloy in the volume conductivity, so that the conductor core true core conductor, the obvious reduction of core diameter, improve conductivity, taking into account the hardness of aluminum alloy materials, in the tight pressure, annealing process, must choose the right mold, The cutter speed and annealing temperature are used to ensure the uniform shape of the aluminum alloy conductor and the effect of tight pressure.
In order to achieve a better tightening effect, according to the core section of the selection of different equipment for the cutter pressure, small section of the core using tubular stranding machine, the medium section of the core of the roller forming stranded wire machine, large section of the wire core using frame-type stranding machine.
The annealing process of conductor
The conductor annealing should follow three principles: annealing temperature, annealing time, loading volume.
Annealing temperature: annealing temperature is higher than the full recrystallization temperature, but lower than the grain too much growing temperature.
Annealing time: In order to ensure that the internal and external conductor filaments fully fully recrystallized conditions, as far as possible to take the lower limit of time to improve production efficiency and reduce energy consumption.
Loading Volume: The size of the conductor load on the conductor after annealing performance has a direct impact, as far as possible to choose the amount of plate size of the annealing treatment, as far as possible to avoid daytime annealing, the best time to install the furnace full.
Aluminum Alloy Belt interlock armored technology Interlocking armored is a single layer armored structure, the characteristics of aluminum alloy with pre-pressure into the "s" surface, the core as the center of rotation wrapped in the cable core outside, each section "S"-shaped surface itself together, forming a layer of self-locking armor layer. The armored belt uses 5000 series aluminum alloy belt, has the good forming processing performance, the strength is high especially the anti-fatigue strength high, the corrosion resistance and the weldability is good, but the cutting performance is poor. In the armored process, in addition to equipment factors, alloy belt material properties, section geometry, size, buckle clearance is the technical key, the requirements of the armored pitch consistent, uniform, no cracking no off, can withstand with armored related detection. Mold design and processing, mold position and tension adjustment, as well as the operator's experience is very important.