Electroplating preparation method of copper-clad aluminium bars

Abstract

The invention relates to the manufacturing technology of power transmission conducting bars, in particular to an electroplating preparation method of copper-clad aluminium bars, which comprises the following steps: 1. preparing an aluminium bar, and drawing the aluminium bar to achieve the required size by a mould; 2. washing the aluminium bar with alkali; 3. preliminarily copperplating the aluminium bar washed with the alkali; 4. putting the aluminium bar in a main plating bath for copper sulphate copperplating: continuously blowing the surface of a workpiece in the electroplating process; 5.moving the plated product to a rinse bath and cleanly rinsing the plated product in running clean water; 6. drawing the electroplated product by a dimensioning mould to lead the size of the product to reach requirements; and 7. annealing the drawn product at the annealing temperature of 330-335 DEG C, preserving heat for 5 hours and then carrying out furnace cooling. The conducting bar products obtained by the method have smooth copperplating surfaces, different bimetallic separation in the processing process and low manufacturing cost.

Description

technical field [0001] The invention relates to a manufacturing technology of a conductive bar for power transmission, in particular to an electroplating preparation method of a copper-clad aluminum bar. Background technique [0002] In recent years, the manufacturing and use of power transmission equipment (such as high and low voltage switchgear, high and low voltage busway, etc.) has an increasing demand for copper bars, while copper mineral resources are decreasing year by year, causing copper prices to continue to rise in recent years, increasing the The cost of equipment manufacturing. In order to reduce costs, substitute products for copper have continuously appeared on the market, such as copper-clad steel braided thin wire, copper-clad aluminum-magnesium alloy wire (see Chinese patent 200510040343.1), etc., and a small amount of copper is combined with other metals to make products. Substitute copper to reduce copper consumption and cost. Among them, the copper-cl...

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Problems solved by technology

[0003] 1. Its copper content is still relatively large, and the material cost is high. The weight ratio of its copper content is about 40% (the specific gravity is 3.63-4g / cm 3 ), if the production of copper tubes with reduced wall thickness is used to reduce the amount of copper, the phenomenon of "exposed aluminum" will appear in the process of heating, rolling, extrusion and drawing. In order to ensure that there is no "exposed aluminum", the content of copper cannot be reduced;

[0004] 2. Since the melting point of copper is greater than that of aluminum, the two metals cannot be fused together at the melting temperature of aluminum, and the bonding fastness between the two metals must be very poor. After production, some finished products can be seen from the cross section Gap, even if there is no gap in the finished product section, the two metals are easily separated during the shearing, bending and punching process, and if there is air between the bimetals, copper oxide and aluminum oxide will be produced, resulting in the formation of bimetallic Resistance, if there is a resistance for a long time, it will heat up abnormally, which will cause a safety hazard

[0005] Although the method of electroplating copper on the surface of the aluminum row can form a conductive row product with a relatively small weight of copper and a relatively dense combination of the two metals, there are still many difficulties to overcome when the conventional electroplating production method is directly used in the production of copper-aluminum composite conductive row. problems, such as: the copper layer on the surface is rough, dull, and not smooth after electroplating; the copper layer on the bent surface of the product is prone to cracking after electroplating