Method for manufacturing copper aluminium composite tubing and copper aluminium tubing produced thereby

Abstract

The invention relates to a copper-aluminum compound tube material and relative producing method, belonging to the technique of metallic compound tube material production. Said invention comprises a copper inner layer and an aluminum outer layer. It is characterized in that: at the connection of copper and aluminum layers, said inner and outer layers are dispersed to each other to form a connecting layer to combine them. The producing method comprises; using planet rolling tube has single-rail sectional contraction rate on the compound tube is 50-95%; the outlet rolling speed is 5-30m / min; and the single-rail rolling is processed when the temperature of distortion section reaches 200-600Deg. C. The inventive method can combine two layers, with fewer processes, high efficiency, large batch and lower cost. And the product has better mechanical and thermal exchange properties, without defects in following process. It can be used to replace copper and alloy tube, to reduce producing cost.

Description

Technical field: [0001] The invention belongs to a metal composite pipe and its manufacturing technology, in particular to a metallurgically bonded composite pipe and its manufacturing technology. Background technique: [0002] Copper and its alloys have good corrosion resistance, thermal conductivity and good mechanical properties. Therefore, copper and its alloy pipes are widely used as fluid delivery pipes in construction, refrigeration, air conditioning, refrigerators, solar energy, water heaters, and condensers. , radiators and other fields and products. However, due to the limited resources of copper, the price is relatively expensive, and the proportion of copper is relatively large and the weight is heavy. Therefore, people have been trying to find a cheaper metal pipe that can replace copper and its alloy pipes. Among them, people can easily think of aluminum and its alloy pipes. Because aluminum is rich in resources and low in cost, the current price of aluminum i...

AI Technical Summary

Problems solved by technology

These existing methods have many processes, low yield, short pipe length and low efficiency.

More importantly, the copper-aluminum composite pipes produced by these existing methods can only achieve mechanical bonding of the copper-aluminum joint surface, and such a joint surface will produce a gap between copper and aluminum during the processing and use of the subsequent pass. The phenomenon of peeling, delamination, wrinkling, etc., and the entry of the joint surface into the electrolyte will cause catastrophic electrochemical corrosion, which seriously affects the application and promotion of copper-aluminum composite pipes. This is why copper-aluminum composite pipes have not been able to replace pure The root cause of the wide application of copper and its alloy pipes

Images