Copper-clad aluminium wire production method

Abstract

The invention relates to a copper-clad aluminium wire production method, comprising the following processes: a. surface treatment is carried out to aluminum core material and copper strips under protective atmosphere; b. the treated aluminum core material and the copper strips enter in a workbench immediately to lead the scrubbed copper strips to surround the outside of an aluminium rod to form a tubular shape, the inner diameter of the formed copper tube is larger than the outer diameter of the aluminium rod, a gap with 0.1-1.0mm is left between the aluminium and the copper, the gap formed by cladding is welded after the aluminum core material is arranged at the bottom part of the copper tube, and then the copper-clad aluminium wire which is cladded and welded is drawn out with 30-90 percent of section decreasing ratio; c. diffusing heat treatment is carried out to the drawn copper-clad aluminium wire, the temperature of heat treatment is 250-400 DEG C, so as to form a diffusing layer with 1-20 micrometers between the copper and aluminium interfaces; d. the diameter of soft wires is reduced through a series of diameter reducing treatment of multiple molds of a diameter reducing device which is provided with a single block machine and a continuous drawing machine, so as to obtain the wire diameter of the finished products. The method improves the combining property of the copper-clad aluminium wire and leads the section decreasing ratio of metal combination to be reduced to below 35 percent.

Description

technical field [0001] The invention relates to a production method of bimetal composite wire, in particular to a production method of copper-clad aluminum wire. Background technique [0002] Generally speaking, a double metal wire uses one metal material as the core material, and another metal is coated on the outer layer of the core material by electroplating or hot-dip plating. The main disadvantage of this traditional production method is that The thickness of the cladding layer is not uniform, and high-speed continuous production cannot be achieved. Based on the above situation, there is currently a production method of extrusion coating, which is mainly composed of a core material and two outer cladding metal strips. Although this production method has great progress and obvious advantages compared with the traditional production method, it also has some unsatisfactory disadvantages as follows: one, the surface reduction rate needs to reach 60%-80% to obtain better T...

AI Technical Summary

Problems solved by technology

Although this production method has great progress and obvious advantages compared with the traditional production method, it also has some unsatisfactory disadvantages as follows: one, the surface reduction rate needs to reach 60%-80% to obtain better The thickness of the diffusion layer; 2. It consumes a lot of energy, such as the preheating process before coating; 3. The bonding performance of the copper-clad aluminum wire is not ideal, and even generates a brittle phase; 4. The copper-clad aluminum wire appears at some points during the production process. The tearing of the bonding layer occurs from time to time, which greatly reduces the performance of the copper-clad aluminum wire. Based on the above situation, it is necessary to further improve the production process