High-conductivity non-heat-treatment type moderate-intensity aluminum alloy wire and production method thereof

Abstract

The invention discloses a high-conductivity non-heat-treatment type moderate-intensity aluminum alloy wire and a production method of the high-conductivity non-heat-treatment type moderate-intensity aluminum alloy wire. The high-conductivity non-heat-treatment type moderate-intensity aluminum alloy wire is produced by finely selecting ingredients and contents of aluminum alloy and conducting process control. The specific steps are as follows: selecting Fe, Si, Mg, Cu and Re with different weight percents, melting aluminum ingot with the content not more than 0.03% in a vertical melting furnace, adding alloying elements in a heat insulation furnace, stirring, refining, conducting on-the-spot contents rapid analysis, carrying out content adjustment, and standing, enabling the aluminum ingot and the alloying element into a continuous casting machine for casting, rolling to be a circular aluminum alloy rod on a continuous rolling machine, pulling the circular aluminum alloy rod to be a circular aluminum alloy wire and twisting the circular aluminum alloy wire to be a conductor for aerial power transmission and distribution. According to the application of the aluminum alloy wire and the production method of the aluminum alloy wire, the aluminum alloy wire directly replaces the generally used aluminum conductor steel reinforced and is an energy-saving, environment-friendly and novel wire.

Description

technical field [0001] The invention relates to the manufacture of electrical materials, which is a manufacturing technology of conductive aluminum alloys, in particular to a high-conductivity non-heat-treated aluminum alloy wire and a manufacturing method thereof. Background technique [0002] At present, steel-cored aluminum stranded wires and aluminum-clad steel-cored aluminum stranded wires are still generally used as conductors for power transmission and distribution on transmission lines in my country. With the continuous increase of national power demand, the State Grid is developing towards ultra-high voltage and ultra-high voltage lines. Demand, actively explore the use of new types of overhead conductors. Due to the low tensile strength of ordinary aluminum materials for steel-reinforced aluminum stranded wire and aluminum-clad steel-reinforced aluminum stranded wire, reinforcement core elements such as steel core or aluminum-clad steel core have to be added in th...

AI Technical Summary

Problems solved by technology

Strengthening core components such as steel core or aluminum-clad steel core not only increase the weight of the wire, greatly increase the cost of operation and transportation, but also require a higher tower and a stronger tower foundation, occupying a large area

In addition, in AC transmission lines, steel core or aluminum-clad steel core and other strengthening elements will also cause hysteresis loss, which reduces the transmission capacity of the line.

[0003] Chinese patent CN 102041418 A discloses a method for manufacturing a medium-strength aluminum alloy wire with a conductivity of 57%. Although the tensile strength is ≥ 245MPa, its conductivity is only 57%. If it is widely used on the line, it will inevitably cause a loss of power in the transmission line. Huge loss, and at the same time cause the voltage of the line to drop significantly

[0004] Chinese patent CN 201110030978.9 discloses a method for manufacturing a medium-strength aluminum alloy wire with a conductivity of 59%. Although the tensile strength is ≥230MPa, its conductivity can only reach 59%-59.3%IACS, and aluminum alloy ingots need to be homogenized. The qualitative treatment and the subsequent aluminum alloy single wire need to adopt heat treatment method, that is, put all the drawn aluminum alloy single wire into the heat treatment furnace, heat it to 180-220°C, and keep it warm for 5-6 hours. For enterprises, it is not only necessary to add aluminum alloy ingot homogenization treatment furnace and aluminum alloy wire heat treatment furnace equipment, but also consume a lot of electric energy. In addition, the heat treatment furnace has limited volume and can only process a small amount of ingot or aluminum alloy wire at a time. This causes a large backlog of intermediate products in the heat treatment process. These two additional processes seriously restrict production efficiency and delivery cycle and increase product costs. In addition, in the heat treatment process, it is easy to produce ingot homogenization and uneven heat treatment of aluminum alloy wire. Cause unstable product performance and reduce product qualification rate

[0005] Chinese patent CN 1485455A discloses a method for manufacturing non-heat-treated 60%IACS high-conductivity heat-resistant aluminum alloy wire. Although its conductivity reaches 60%IACS, its tensile strength is only ≥159MPa, and its manufactured conductivity

[0006] The overall tensile strength of the wire is low, and it is usually only used for the operation of small-gauge distribution lines of 100m and below. For transmission lines of 110kV and above, the wire needs to add steel cores and other reinforcing cores to improve the overall conductor tensile strength. Additional steel cores and other reinforcements The core is added, causing a substantial increase in the weight of the wire and an increase in the loss of the wire

In addition, the bearing capacity of the iron tower is increased, and at the same time, the height of the iron tower has to be increased, which requires a larger floor area and buried depth of the iron tower foundation, causing the engineering quantity and project cost to double.

Images