Preparation technology of copper and aluminum combined flat wire

Abstract

The invention provides a preparation technology of a copper and aluminum combined flat wire. Firstly, copper and aluminum combined blanks are formed through horizontal continuous casting direct combination, and the area proportion of a wrapping copper layer is 15-50%. The preparation technology includes the following steps that firstly, rolling is performed, wherein a hole shape rolling technology is adopted, and the machining rate reaches 75-85% after rolling ends; secondly, drawing is performed, wherein drawing speed is controlled within 3-40 m / min, the thickness reduction amount of each pass is controlled to be 0.1-1.5 mm, the width reduction amount of each pass is controlled to be 0.1-2 mm, and the cross area total reduction amount is controlled to be 40-99% after drawing; thirdly, annealing is performed. The copper and aluminum combined flat wire can be prepared just through the horizontal continuous casting composite forming technology of copper and aluminum combined rod blanks, rolling, drawing and annealing, and efficient, short-process, high-yield and low-cost production of the copper and aluminum combined flat wire is achieved. The thickness of the copper layer of the copper and aluminum combined flat wire produced through the method is adjustable, the interface bonding strength is high and is larger than or equal to 40 Mpa, and a ten-thousand-ton-level industrialized production line and large-scale production of the copper and aluminum combined flat wire can be achieved through the method.

Description

technical field [0001] The invention belongs to the field of bimetallic composite materials, and in particular relates to a preparation process of a copper-aluminum composite flat wire. Background technique [0002] Copper-aluminum composite flat wire is a kind of bimetal composite material with aluminum as the matrix, the outer layer is evenly coated with copper, and the copper and aluminum form a permanent atomic metallurgical bond. The surface is bright, round and free of defects. It is a new type of conductor material that combines the high-quality and stable electrical conductivity of copper with the low cost and low density of aluminum. It can completely replace pure copper bars and save copper with aluminum. The key to its forming technology is to ensure reliable bonding between metals. The traditional production process of copper-aluminum composite materials is: [0003] 1. Copper-clad aluminum billets are produced by cladding welding method or casing method; [0...

AI Technical Summary

Problems solved by technology

[0006] However, this traditional process has the following disadvantages: the above-mentioned traditional copper-aluminum composite material preparation method needs to prepare clad copper tube and aluminum core material separately, after complicated mechanical and chemical surface treatment, and then pass the two through a certain Processes (such as cladding welding, hydrostatic extrusion, multi-pass drawing, etc.) are combined together, resulting in long production process, heavy environmental burden, low production efficiency, low yield, and low interface bonding strength (copper-aluminum bonding strength less than 35MPa), the thickness of the clad copper layer cannot be adjusted, it is difficult to prepare composite conductor materials with a larger cross-sectional size, and it is difficult to realize 10,000-ton industrial production lines and large-scale production.