A high-performance cooper-coated aluminum rectangle section compound conductive bus bar and its making technology

Abstract

The present invention provides a high-performance copper-clad aluminum cross section composite conductive bus-bar and the preparing technique thereof, and the invention relates to a rectangle-cross section bimetal composite material and the preparation thereof. The copper-clad aluminum rectangular cross section composite conductive bus-bar is compounded by the core-part aluminum and the coating layer copper. The area proportion of the coating copper layer is 15to 50 The technique comprises the following procedures: Adopting horizontal continuous casting for directly compounding and forming the copper-clad aluminum composite blank. Commonly flat-roller rolling and finish drawing-pulling the copper-clad aluminum blank according to requirement or rolling with the flat roller provided with a vertical roller, the range of the rolling speed is 3-50m / min, and the single-pass relative reduction is between 15and 40 The speed range of finish drawing-pulling is 1-20m / min and the single-pass cross section scalage is 10%. When the multiple-pass relative reduction is up to 70%, the low-temperature intermediate annealing is executed to the copper-clad aluminum composite conductive bus-bar. The annealing temperature is between 250 and 450 DEG C and the annealing time is between 0.5 and 3h. The annealed composite conductive bus-bar is executed with hole-form rolling or drawing. The invention not only can produce the high-performance copper-clad aluminum cross section composite conductive bus-bar, but also has the advantages of short process flow and high efficiency of the producing method.

Description

technical field [0001] The invention relates to a rectangular cross-section bimetallic composite material and a preparation method thereof, in particular to a high-performance copper-clad aluminum rectangular cross-section composite conductive busbar and a production method thereof. Background technique [0002] Copper-clad aluminum composite conductor is a new type of bimetallic composite conductor, which has the advantages of good electrical conductivity, low density, and low cost. Among them, its typical product, copper-clad aluminum rectangular cross-section composite conductive busbar, has high cost performance and can be It replaces the existing pure copper rectangular conductive busbar, and is widely used in industries such as electric power, busway, high and low voltage switchgear. [0003] The production methods of copper-clad aluminum rectangular cross-section composite conductive busbars that have been publicly reported are as follows: (1) using aluminum cores and...

AI Technical Summary

Problems solved by technology

There are problems in this method: First, since the aluminum core and the copper tube must be assembled together by gap fit, and the gap is difficult to completely eliminate in subsequent processing, it is difficult to avoid gap discharge corrosion during use, and the product The performance is difficult to guarantee; secondly, because it is difficult to guarantee the straightness of the copper tube and the aluminum tube, it is difficult to produce a long copper-clad aluminum busbar; thirdly, due to the inner surface of the copper tube and the surface of the aluminum core before compounding Complicated cleaning procedures are required, and it is difficult to achieve continuous production, so the production efficiency is low and the production cost is high; Fourth, the solid-phase composite copper-clad aluminum billet is drawn or rolled, due to the small amount of deformation in a single pass, it is easy to cause Peeling of copper and aluminum layers reduces the yield and conductivity of copper-clad aluminum special-shaped wires

The disadvantages of this method are: firstly, the copper pipe needs to be cleaned and coated with a protective layer, which not only increases the production cost, but also increases the environmental burden; secondly, casting under a protective atmosphere limits the length of the billet, and when the copper pipe For a long time, it is difficult to avoid defects such as cold shut, shrinkage cavity, and porosity; third, the pretreatment process is complicated, and it is difficult to form continuous production, the production efficiency is low, and the production cost is high; The mouth needs to cut off the head and tail, which further reduces the production efficiency and yield

The above-mentioned possible methods for preparing copper-clad aluminum conductive busbars all have problems such as long process routes, poor quality consistency and stability, and high production costs.