Method for manufacturing copper pipe with circular outside and irregular inside

Abstract

The invention discloses a method for manufacturing a copper pipe with a circular outside and an irregular inside, which comprises the following steps of: firstly, after performing hot pressing and cold rolling on a copper alloy ingot, stretching the ingot into a pipe blank, performing complete recrystallization annealing on the pipe blank, and arranging a chuck in an integrated structure or a split connection structure with the pipe blank at the front end of the pipe blank; secondly, stretching the pipe blank into the copper pipe with the circular outside and the irregular inside by finished product stretching equipment, wherein the finished product stretching equipment comprises a stretching die with a stretching hole inside and a stretching lining core which consists of a lining core and a stretching core rod connected with the end part of the lining core; and thirdly, distressing, finishing and annealing the stretched finished pipe under a protective atmosphere to eliminate the residual stress in the pipe. In the copper pipe with the circular outside and the irregular inside manufactured by the method, the inner and outer surfaces of the pipe do not need mechanical machining again; the utilization rate of the raw materials and the yield are improved; the manufacturing cost and resource waste are greatly reduced; the pipe is long in service life; and the maintenance cost caused by the frequent replacement of the corroded pipes is reduced.

Description

technical field [0001] The invention relates to the technical field of manufacturing copper-based alloys, in particular to a method for manufacturing a special-shaped copper pipe with an outer circle and an inner portion. Background technique [0002] At present, the use of brass in foreign countries to produce small-diameter, thick-walled special-shaped corrosion-resistant copper pipes is mainly manufactured by mechanical processing methods. However, the use of mechanical processing to manufacture special-shaped copper pipes with outer circles and inner circles is difficult to process, low yield and production efficiency, and metal consumption. Large size and high cost; this kind of special-shaped outer circle with small outer diameter and thick-walled copper tube has a small outer diameter, thick tube wall and irregular-shaped inner hole, and the metal deformation is extremely uneven during the processing process. Technical problems such as production process and design Th...

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Problems solved by technology

[0002] At present, the use of brass in foreign countries to produce small-diameter, thick-walled special-shaped corrosion-resistant copper pipes is mainly manufactured by mechanical processing methods. However, the use of mechanical processing to manufacture special-shaped copper pipes with outer circles and inner circles is difficult to process, low yield and production efficiency, and metal consumption. Large size and high cost; this kind of special-shaped outer circle with small outer diameter and thick-walled copper tube has a small outer diameter, thick tube wall and irregular-shaped inner hole, and the metal deformation is extremely uneven during the processing process. Technical problems such as production process and design There are high requirements on the above, but these technical problems are still blank in China, and technicians in this field are also urgently looking for a better manufacturing method to meet the needs of the current market

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