Copper aluminum composite pipes shaping method

A technology of copper-aluminum composite and copper tube, which is applied in the direction of metal extrusion mandrel, etc., can solve the problems that bimetallic composite tubes cannot be made of copper-aluminum composite tubes, bimetallic tubes are difficult to form, etc., and achieve good application prospects, continuous production, The effect of simple process

Inactive Publication Date: 2009-03-11
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the problems that the existing bimetallic composite pipe technology cannot produce copper-aluminum composite pipes and overcome the difficulty in forming bimetallic pipes in the proce...

Method used

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  • Copper aluminum composite pipes shaping method
  • Copper aluminum composite pipes shaping method
  • Copper aluminum composite pipes shaping method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Example 1: The raw materials are two Φ9.5mm pure aluminum rods and a Φ10mm copper tube with a wall thickness of 1mm (inner diameter 8mm), matching the corresponding moving core head, the inner diameter of the female mold is Φ12mm, and the mold cavity preheating temperature is 500°C, extrusion wheel speed 6rpm.

[0048] Results: A copper-aluminum composite tube with an outer diameter of Φ12mm and an inner diameter of Φ8mm was obtained, with a dimensional accuracy of ±0.05mm, a thickness of aluminum coating of 1mm, no deformation of the copper tube, and good precision of the inner and outer surfaces of the coated tube.

example 2

[0049] Example 2: The raw materials are two Φ9.5mm pure aluminum rods and a Φ10mm copper tube with a wall thickness of 2mm (inner diameter 6mm), matching the corresponding swimming core head, the inner diameter of the female mold is Φ12mm, and the mold cavity preheating temperature is 500 °C, the rotation speed of the extrusion wheel is 10 rpm.

[0050] Results: A copper-aluminum composite pipe with an outer diameter of Φ12mm and an inner diameter of Φ8mm was obtained, with a dimensional accuracy of ±0.08mm, a thickness of clad aluminum of 1mm, a reduced thickness of the copper pipe, a wall thickness of 1mm, and good precision of the inner and outer surfaces of the clad pipe.

example 3

[0051] Example 3: The raw materials are two Φ9.5mm pure aluminum rods and a Φ8mm copper tube with a wall thickness of 1mm (inner diameter Φ6mm), matching the corresponding swimming core head, the inner diameter of the female mold is Φ10mm, and the cavity preheating temperature is 480 °C, the rotation speed of the extrusion wheel is 10 rpm.

[0052] Results: A copper-aluminum composite tube with an outer diameter of Φ10mm and an inner diameter of Φ6mm was obtained, with a dimensional accuracy of ±0.05mm, a thickness of aluminum coating of 1mm, no deformation of the copper tube, and good precision of the inner and outer surfaces of the coated tube.

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Abstract

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.

Description

technical field [0001] The invention relates to a copper-aluminum composite pipe, in particular to a forming method of the copper-aluminum composite pipe. Background technique [0002] The copper-aluminum composite pipe is a bimetallic pipe. Bimetallic pipes are often divided into the following categories according to their uses: 1) Corrosion-resistant pipes for petroleum and chemical industries. Generally, the lining pipe is austenitic stainless steel and the outer layer is low-carbon steel: 2) Wear-resistant bimetallic composite pipes, Generally, the inner lining is high-chromium cast iron, and the outer steel pipe is used; 3) bimetal composite pipes for home decoration, generally steel pipes for inner lining, copper or aluminum pipes for outer cladding; 4) copper-aluminum composite pipes for heat exchangers, the purpose is to replace copper with aluminum ,cut costs. [0003] Copper tubes are the main components used in refrigerators and air conditioner heat exchangers. ...

Claims

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Application Information

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IPC IPC(8): B21C23/24B21C25/04
Inventor 钟毅张家涛孙淑红尹建成高鹏
Owner KUNMING UNIV OF SCI & TECH
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