Copper aluminum composite pipes shaping method

The invention discloses a shaping method for a Cu-Al compound tube. In the method, a floating plug technology is combined with a continuous squeezing technology; on a single-wheel double-slot continuous squeezing wrapping machine, the floating plug is utilized for realizing to continuously wrap aluminum or an aluminum alloy with a certain thickness on the copper tube. For one aspect, the floating plug plays the roles of supporting the copper tube and ensuring the intensity of a core for successful shaping; for the other aspect, the floating plug can freely float during the process of wrapping and shaping for achieving the demands on the size of an inner hole and the high precision of an inner surface, thus obtaining the Cu-Al compound tube which is metallurgically combined and achieving the combination between the continuous squeezing and the floating plug technology. The outer diameter of the Cu-Al compound tube is decided by the size of the inner hole of a cavity block. The method can realize the metallurgical compounding for the double metals of aluminum and copper, has a simple technique, saves energies, can realize continuous production, can effectively reduce the costs for the heat exchangers used for a refrigeratory and an air conditioning and has excellent application prospect.