Method for making tinned copper clad aluminum wire

Abstract

The present invention relates to the technical field of wires and cables and particularly relates to a method for making a tinned copper clad aluminum wire. The method comprises the steps of (1) making a rare earth aluminum alloy aluminum rod, melting 99.95% fine aluminum through a double-frequency furnace, adding a rare earth alloy component, and carrying out pulling to form an aluminum rod with the diameter of 8.6mm, (2) carrying out copper belt cladding, cladding the aluminum rod with the diameter of 8.6mm by a high pure copper belt with the corresponding thickness and width in the step (1) through a cladding machine, overmoding and pulling the cladded aluminum rod through a pulling machine to the diameter of 2.05mm, (3) carrying out drawing and tinning, carrying out middle pulling firstly, finally carrying out annealing tinning, and carrying out hot-dip type overmode tinning with the accuracy requirement of + / -0.001 of a tinning mold. The method has the advantage of simple structure, copper and aluminum composite and rare earth aluminum alloy materials are employed, the advantages of the high conductivity of copper and the small density of aluminum are fully played, and the purpose of replacing a pure copper wire is achieved.

Description

technical field [0001] The invention relates to the technical field of cables and wires, in particular to a method for manufacturing tinned copper-clad aluminum wires. Background technique [0002] At present, the wires used in the market are generally pure copper wires. This is not only because the high copper price makes enterprises face rising cost pressures. The substitution rate of aluminum alloy for copper in developed countries is quite high, among which the United States is as high as 70%-75%, Japan is about 55%, and China is only 3%-5%. As a country lacking in copper resources, compared with foreign countries, we have Larger gap. Using the skin effect, in the cross section of the conductor, there is a phenomenon that the current density of the edge part is high, and the current density of the central part is small. The copper-clad aluminum wire in the prior art has poor wrapping strength, and is prone to cracking after long-term use, especially at the bending posi...

AI Technical Summary

Problems solved by technology

The copper-clad aluminum wire in the prior art has poor wrapping strength and is prone to cracking after long-term use, especially at the bending position, which can easily cause gaps between copper and aluminum, and arcs will occur for a long time. The temperature in this place is too high, which is prone to fire