Method for producing copper-coated aluminum bus bar of low specific resistance and good plasticity and tenacity

A technology of copper-clad aluminum bar and production method, which is applied in the direction of circuits, electrical components, conductors, etc., can solve the problems of increased contact resistance, high resistivity, poor metallurgical bonding, etc., and achieve high interface bonding strength, short process flow, The effect of high production efficiency

Active Publication Date: 2015-03-25
孙华桥 +1
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AI-Extracted Technical Summary

Problems solved by technology

[0005] The shortcomings of the copper clad aluminum bar in the above prior art are: the existing production process, the metallurgical bonding between aluminum and copper is poor, resulting in increased contact resista...
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The invention provides a method for producing a copper-coated aluminum bus bar of low specific resistance and good plasticity and tenacity. The method comprises the following steps that a copper strip and an aluminum bus bar are conveyed into a coating machine to be formed and welded, the copper strip and the aluminum bus bar are rolled and tightened through a cold mill, and then the copper strip and the aluminum bus bar are cut according to needed sizes; secondly, cut copper-coated aluminum bus bar materials are continuously fed into an intermediate-frequency heating furnace to be preheated for 60 to 150 seconds, and the temperature of the sawn copper-coated aluminum bus bar materials is adjusted to 300 to 600 DEG C; thirdly, the copper-coated aluminum bus bar materials are fed into a continuous heating furnace to be heated for 90-120 minutes at the temperature of 300-620 DEG C; fourthly, the copper-coated aluminum bus bar materials are conveyed into a hot mill through a roller bed for fine rolling and cooling, the rolled copper-coated aluminum bus bar materials are drawn and shaped, then the copper-coated aluminum bus bar materials are sent into a vacuum annealing furnace to be bright-annealed, and then finished products are obtained. According to the method for producing the copper-coated aluminum bus bar of low specific resistance and good plasticity and tenacity, an aluminum core is covered by a copper coating, cost is low, continuous production can be conducted, the technological process is short, the production efficiency is high, mechanical operation is adopted in the whole process, the interface combination strength is high, and the requirements of electric devices can be met.

Application Domain

Non-insulated conductors

Technology Topic

Intermediate frequencyElectric devices +8


  • Experimental program(1)

Example Embodiment

[0019] Below in conjunction with embodiment the present invention is described in detail:
[0020] The production method of the copper-clad aluminum row of the present embodiment comprises the steps:
[0021] A. Use a cladding material processor to deoxidize the surface of the copper strip and aluminum row;
[0022] B. Then, send the copper strip and aluminum row into the cladding machine for forming and welding, then roll and tighten with a cold rolling mill, and then saw and cut according to the required size;
[0023] C. Send the broken copper-clad aluminum discharge continuously into the intermediate frequency heating furnace for preheating for 60-150 seconds to adjust the temperature to 300-600°C; use intermediate frequency furnace for preheating, which is suitable for making the copper surface and aluminum surface When heated in an instant, the surface layers of the two alloy metals melt instantly, achieving a true metallurgical combination.
[0024] D. Then send the copper-clad aluminum discharge into the continuous heating furnace, the heating temperature is 300-620°C, and the heating time is 90 minutes to 120 minutes; the purpose of using the continuous heating furnace to heat the copper-clad aluminum discharge is to reduce the material Excellent deformation resistance, improve plasticity, facilitate forming during rolling, and improve stability during rolling.
[0025] E. Then the copper-clad aluminum discharge is sent to the hot rolling mill for finishing rolling and cooling through the roller table; rolling is to place the metal material in two counter-rotating rollers to obtain compression deformation, which is also higher than that Under the condition of crystallization temperature, the metal material undergoes plastic deformation and recrystallization at the same time. Rolling can improve the structure of the product while forming it, so as to obtain the size and shape we need, and change the crystallization state of the formed product to improve the mechanical properties of the workpiece.
[0026] F. After the rolled copper-clad aluminum discharge material is drawn and shaped, it is cut to length according to the process; the rolling speed of the hot rolling mill is 80-100 m/s, and the rolling temperature is 280-640 ° C .
[0027] G. Put the copper-clad aluminum discharge material with a fixed length into the vacuum annealing furnace for bright annealing to obtain the finished product. The annealing temperature is 400-600°C and the annealing time is 6-12 hours; According to different product specifications, it is heated to a preset temperature, and after being kept at this temperature for a certain period of time, it is naturally cooled to room temperature. This annealing step is suitable for improving plasticity and toughness, homogenizing chemical components, removing residual stress, and obtaining expected physical properties; it is also suitable for reducing resistivity and enhancing conductivity of copper-clad aluminum bars. In addition, annealing is also suitable for eliminating the slight oxidation of copper-clad aluminum bars during the production process and improving the surface quality of copper-clad aluminum bars.
[0028] H. Put the finished product into the automatic packaging line for packaging and storage.
[0029] The welding method adopted by the forming welding of the cladding machine is: adopting a high-frequency argon arc self-melting welding machine to continuously self-melt copper-clad aluminum bars, and the welding speed is greater than 15 m/min.
[0030] Apparently, the above-mentioned embodiments are only examples for clearly illustrating the present invention, rather than limiting the implementation of the present invention. For those of ordinary skill in the art, other changes or changes in different forms can be made on the basis of the above description. It is not necessary and impossible to exhaustively list all the implementation manners here. And these obvious changes or modifications derived from the spirit of the present invention are still within the protection scope of the present invention.


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