Aluminum alloy rod continuous casting and rolling process
The excellent aluminum alloy conductor rod is the decisive factor for the electrical properties and mechanical properties of the aluminum alloy cable
. The stable production of the aluminum alloy rods that meet the requirements is mainly from the following links.
1) Calculate and determine the amount of aluminum ingot, intermediate alloy, and additives. After the material is melted into the holding furnace, add the additive to the refining and stirring. At the same time, sample and analyze the different points in the furnace and adjust accordingly if necessary.
2) Due to the high temperature after alloy refining, the crystallization of aluminum liquid is difficult. Pay attention to adjusting the cooling water pressure at any time to keep the crystal wheel smooth and clean, so that the aluminum liquid can be crystallized smoothly.
3) Strictly control the tensile strength and elongation of the aluminum rod during rolling to facilitate the subsequent pressing and stranding process. Because the aluminum rod has internal stress, it can be stored for more than 48 hours.
Conductor compaction process
The aluminum alloy cable
conductor adopts 8000 series aluminum alloy and adopts special pressing process. In order to control the outer diameter of the cable, the general tightening coefficient is controlled above 0.92, and the maximum limit of compaction is used to compensate for the shortage of volumetric conductivity of the aluminum alloy. The stranded conductor core, such as a solid conductor, significantly reduces the outer diameter of the core and improves the electrical conductivity. Considering the hardness of the aluminum alloy material, it is necessary to select a suitable mold, stranding speed, and annealing during the pressing and annealing process. The temperature is to ensure that the shape of the aluminum alloy conductor is uniform and the pressing effect is excellent. In order to achieve a better pressing effect, different equipment can be used for twisting and pressing according to the core section, a small section core adopts a tubular stranding machine; a medium section core adopts a roll forming stranding machine; a large section line The core adopts a frame stranding machine.
Conductor annealing process
Conductor annealing follows three principles: annealing temperature, annealing time, and disk loading.
Annealing temperature: The annealing temperature is higher than the full recrystallization temperature, but lower than the temperature at which the crystal grains are excessively grown.
Annealing time: Under the condition that the inner and outer conductor monofilaments are fully recrystallized, the lower limit of time is taken as much as possible to improve production efficiency and reduce electric energy consumption.
Loading capacity: The amount of conductor loading has a direct influence on the performance of the conductor after annealing. Try to choose the annealing treatment with the same amount of loading, try to avoid annealing during the day, and the filling capacity is best filled once.
Aluminum alloy interlocking armoring process
The interlocking armor is a single-layer armored structure, which is characterized in that the aluminum alloy strip is pre-pressed into an "S" type curved surface and is rotated around the core of the core with the core as a center, and the "S" curved surface of each section is itself They are interlocked to form a self-locking armor layer. The armored belt adopts 5000 series aluminum alloy belt, which has good forming and processing properties, high strength, especially high fatigue resistance, corrosion resistance, and weldability, but poor cutting performance. In addition to the equipment factors, the performance of the alloy strip material, the section geometry, the size, and the fastening gap are the key technologies in the armoring process. It is required that the armor pitch is uniform, even and flat, no cracking, no peeling, and can withstand armoring. Detection. Mold design and processing, adjustment of mold stations and tensions, and the accumulation of experience of operators are very important.