New method for preparing copper-aluminum composite pipe

Abstract

The invention provides a new method for preparing a copper-aluminum composite pipe. The method comprises the following steps of winding a rolled internal layer copper or aluminum metal band into a metal circular pipe under the traction action of a guide wheel and the extrusion action of a forming roller; forming an internal layer metal pipe by welding a longitudinal seam; winding and cladding an external layer aluminum or copper metal band around the internal layer metal pipe by the same method; forming a copper-aluminum composite pipe blank by welding the longitudinal seam; and obtaining the copper-aluminum composite pipe with needed size through drawing and heat treatment. The adopted method ensures that the preparation of the copper-aluminum composite pipe can be conducted all at room temperature, multilayer composite of copper-aluminum-copper, and the like can be flexibly conducted, the preparation process is simple, and the requirement on the device is low. The speed at which the guide wheel moves forwards is controlled by a servo motor, thus ensuring the moving speed of the guide wheel to be stable and welding points of the longitudinal seam to be positioned in a same horizontal line, and preventing the phenomena that the composite pipe surface wrinkles, and the like. The method has great advantage in the preparation of the copper-aluminum composite pipe.

Description

(1) Technical field [0001] The invention relates to a manufacturing method of a bimetallic composite material, and is especially suitable for a composite pipe material with metallurgical bonding and its manufacturing technology. (2) Background technology [0002] Copper and its alloys have good electrical conductivity, thermal conductivity, corrosion resistance and other good mechanical properties. Therefore, as a fluid transmission pipe, it can be widely used in construction, refrigeration, air conditioning, refrigerators, water heaters, condensers, radiators, etc. In the field, especially in the air conditioner connecting tube products, oxygen-free copper tubes are used, which can be easily connected by flame brazing to increase the length. Corrosion problems, the pipeline is easy to bend, and the bending is not easy to break. However, due to the limited resources of copper, the price is relatively expensive. Especially in the past two years, the price of copper has more t...

AI Technical Summary

Problems solved by technology

However, due to the large difference in the melting points of copper and aluminum (the difference between the two is about 400 ° C), when copper is covered on the aluminum surface, the internal aluminum will be difficult to control due to high temperature melting; at the same time, the liquid-solid interface is more likely to generate CuAl2 compounds, The compound is brittle and has a great influence on the plasticity of copper-aluminum composite materials

Third, since continuous casting and compounding are concentrated on the same equipment, the requirements for equipment are also relatively high