Method for manufacturing heat-resistant aluminum alloy wire for power cable

Abstract

The invention discloses a method for manufacturing a heat-resistant aluminum alloy wire for a power cable, and belongs to the technical field of design and manufacture of power transmission lines. The aluminum alloy wire uses magnesium, copper, iron, silicon, boron, cerium-rich rare earth, zirconium, yttrium, cobalt and the like as alloying elements. The manufacturing process for the aluminum alloy wire comprises the following steps: adding the alloying elements into fused aluminum of a shaft furnace, casting the mixture after smelting into a cast strip and thermally rolling the cast strip, then performing cold-drawing processing, annealing in the cold-drawing process, adopting recrystallization and thermal treatment before final cold-drawing, and later performing trace cold-drawing processing. The aluminum alloy wire not only has good bending resistant performance and forming performance, but also has high conductivity and good heat resistance (comprising high-temperature creep resistance), and can ensure the stability of electrical connection under both normal temperature and high temperature.

Description

technical field [0001] The invention discloses a method for manufacturing a heat-resistant aluminum alloy wire of a power cable, which belongs to the technical field of design and manufacture of transmission lines. The present invention is not suitable for overhead bare wires and power cables for ships and motor vehicles. Background technique [0002] At present, various power cables mostly use copper conductors, which are expensive. If the aluminum wire is used, because the yield strength of the aluminum wire is low and the creep elongation is large, a large creep will occur after long-term operation or current overload, which will cause poor connection and safety problems. [0003] At present, bare aluminum alloy wires with high temperature resistance (150-230°C) have been widely used in overhead lines, but such aluminum alloy wires are high-strength hard wires and cannot be used as cable conductors; power cables, especially those installed on bridges , subways, tunnels,...

AI Technical Summary

Problems solved by technology

[0002] At present, various power cables mostly use copper wires, which are expensive

If the aluminum wire is used, because the yield strength of the aluminum wire is low and the creep elongation is large, a large creep will occur after long-term operation or current overload, resulting in poor connection and safety problems

[0003] At present, bare aluminum alloy wires with high temperature resistance (150-230°C) have been widely used in overhead lines, but such aluminum alloy wires are high-strength hard wires and cannot be used as cable conductors; power cables, especially those installed on bridges , subways, tunnels, and power cables inside various buildings, the wires must have excellent bending resistance and formability, but aluminum alloy wires with such characteristics often have low electrical conductivity, and heat resistance (including high temperature creep) performance) poor