Aluminum alloy rod continuous casting and rolling process
Excellent aluminum alloy conductor rod is a decisive element of the electrical properties and mechanical properties of aluminum alloy cable, stable production of aluminum alloy rods to meet the requirements of the main from the following links.
1)Calculate and determine the amount of aluminum ingots, intermediate alloys and additives, sequentially add material in its melting into the holding furnace, add additives refining and mixing, while sampling and analyzing different points in the furnace, and make corresponding adjustments when needed.
2) Because of the high temperature after alloy refining, aluminum crystallization is more difficult, pay attention to adjust the cooling water pressure at any time, keep the crystallization wheel clean, in order to smooth crystallization of aluminum molding.
3) Rolling strictly control the tensile strength and elongation of the aluminum rod, to facilitate the subsequent pulling and stranding process of tightening. Because the aluminum rod has internal stress to be stored for more than 48 hours before use.
Conductor pressing process
Aluminum alloy cable conductor using 8000 series aluminum alloy, using a special tightening process, in order to control the outer diameter of the cable, the general tightening coefficient of 0.92 or more, through the maximum limit of the tightening, to make up for the lack of aluminum alloy in the volume of conductivity, so that the stranded conductor core such as a solid conductor in general, a significant reduction in the outer diameter of the wire core, to improve electrical conductivity, taking into account the hardness of the aluminum alloy material, in the tightening and annealing process, be sure to select the appropriate conductor core. Considering the hardness of aluminum alloy material, in the process of tightening and annealing, we must select the appropriate mold, stranding speed, annealing temperature to ensure that the aluminum alloy conductor shape uniformity, tightening effect is excellent. In order to achieve better compression effect, according to the core cross-section of different equipment for stranding compression, small cross-section of the core using tube stranding machine; medium cross-section of the core using roll-forming stranding machine; large cross-section of the core using frame stranding machine.
Conductor annealing process
Conductor annealing to follow three principles: annealing temperature, annealing time, the amount of loading disk.
Annealing temperature: annealing temperature should be higher than the temperature of complete recrystallization, but lower than the temperature of excessive grain growth.
Annealing time: in order to ensure that the internal and external conductor monofilament are fully recrystallized under the conditions, try to take the lower limit of time, in order to improve production efficiency and reduce power consumption.
The amount of loading disk: the size of the conductor loading disk amount of conductor annealing performance has a direct impact, as far as possible to choose the amount of loading disk similar annealing treatment, try to avoid annealing during the day, the amount of loading furnace is best to load a full.
Aluminum alloy with interlocking armor process
Interlocking armor is a single-layer armor structure, which is characterized by aluminum alloy belt pre-pressing into "S" shape surface, with the cable core as the center of the rotating wrapped in the outside of the cable core, each section of the "S" shape surface of their own interlocking, forming a layer of self-locking armored sheath. Armor with 5000 series aluminum alloy belt, has good forming and processing performance, high strength, especially high fatigue strength, corrosion resistance and good welding, but poor cutting performance. In the armoring process in addition to equipment factors, alloy belt material properties, section geometry, size, buckle gap is the key to technology, the requirements of armored pitch consistent, uniform and flat, no cracking and no disengagement, can withstand the armor-related testing. Mold design and processing, mold station and tension adjustment, as well as the operator's experience is very important.