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A kind of preparation method of high-performance copper/aluminum composite pipe

An aluminum composite and high-performance technology, which is applied in the direction of manufacturing tools, metal processing equipment, forging/pressing/hammer devices, etc., can solve problems such as high equipment requirements, high quality requirements for sealing welding, and fracture of brittle compound layers. Simple and equipment, improve subsequent cold processing performance, improve the effect of bonding state

Active Publication Date: 2016-04-20
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problems of this method are: high requirements on the sealing of the equipment and high quality of sealing welding; due to the long time of high-temperature diffusion annealing, it is easy to form a thick brittle intermetallic compound layer at the interface, and the brittle compound layer is very weak when subjected to deformation. It is prone to fracture and affects the thermal conductivity and mechanical properties of the composite pipe
The hot extrusion method is suitable for processing high-alloy metals that are difficult to process and have low plasticity. The existing problems are: uneven thickness of the inner and outer layers, high equipment requirements, poor surface quality of the pipe, and difficult for metals with high deformation temperatures. big
It is characterized by high temperature and high pressure during forming, and high bonding strength at the composite pipe interface, but the existing problems are: unfriendly operating environment, high risk, and difficult precise control of the composite process

Method used

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  • A kind of preparation method of high-performance copper/aluminum composite pipe
  • A kind of preparation method of high-performance copper/aluminum composite pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Preparation of metallurgically bonded copper / aluminum (outer aluminum and inner copper) bimetallic composite pipes.

[0025] (1) Surface treatment: the aluminum tube adopts 3003 aluminum alloy tube with a specification of Φ17×2mm, the copper tube adopts a pure copper tube with a specification of Φ12.7×0.55mm, the gap between the casings is 0.15mm, and the mandrel is hardened with a specification of Φ11.4mm. Degreasing the copper and aluminum tubes with 5% NaOH solution, then pickling with 10% HCl solution, and then grinding the inner surface of the aluminum tube and the outer surface of the copper tube with a wire brush to form a fresh metal matrix .

[0026] (2) Casing combination: Put the polished copper tube into the aluminum tube, and then insert the mandrel into the copper tube to ensure that the copper tube is shorter than the aluminum tube, the front end of the mandrel is the longest, and the surface of the mandrel is evenly coated with graphite emulsion lubrica...

Embodiment 2

[0031] Preparation of metallurgically bonded copper / aluminum (outer copper and inner aluminum) bimetal composite pipes.

[0032] (1) Surface treatment: the copper tube adopts a pure copper tube with a specification of Φ17×0.5mm, the aluminum tube is a pure aluminum tube with a specification of Φ15.8×2.1mm, the gap between the casings is 0.1mm, and the mandrel is a mold with a Φ11.4mm For steel, use 5% NaOH solution to degrease the copper and aluminum tubes, then pickle the copper and aluminum tubes with 10% HCl solution, and then use a wire brush to polish the inner surface of the copper tube and the outer surface of the aluminum tube to make them fresh metal base.

[0033] (2) Casing assembly: put the polished aluminum tube into the copper tube, evenly coat the surface of the mandrel with lubricating oil and insert it into the aluminum tube.

[0034] (3) Heating and heat preservation: Blow argon gas into the assembled double-layer tube, and then put it into a heating furnace...

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Abstract

The invention discloses a method for preparing a high-performance copper / aluminum composite pipe, which belongs to the technical field of metal composite pipe preparation. In the present invention, the surface-treated aluminum tube is first put on the outside or inside of the copper tube, and then a mandrel is inserted into the copper tube or aluminum tube to assemble a swaging blank; Carry out rapid heating in the heating furnace or use induction online rapid heating, and use inert gas protection during the heating process; after a short time of heating and heat preservation, it is quickly subjected to single-pass swaging with large deformation, and water spray cooling is carried out at the swivel exit; Finally, a copper / aluminum bimetallic composite pipe with no intermetallic compound at the interface and a metallurgically bonded state is obtained through drawing and finishing one after another. The invention has the advantages of simple production process and equipment, high mold life, high yield and low production cost. It does not need pre-expanded tube compounding, and can directly carry out swaging forming only by heating the casing, and the mandrel, forging The size of the hammer can produce bimetallic composite pipes of different specifications.

Description

technical field [0001] The invention relates to the technical field of metal composite pipe preparation, and provides a production method of a high-performance copper / aluminum composite pipe whose interface reaches a metallurgical bonding state. Background technique [0002] As the key material of heat exchangers, condenser tubes are widely used in important fields of national economy such as thermal power generation, shipbuilding, seawater desalination, petrochemical industry, home appliances and automobiles. The materials used to make condenser pipes mainly include copper and copper alloys, titanium and titanium alloys, and stainless steel. Among them, the heat exchange pipes (including condensers, evaporator pipes and connecting pipes) of air conditioners, refrigerators and other refrigeration products are mainly made of pure copper. Tube, my country's annual consumption of electrolytic copper is more than 700,000 tons. In recent years, due to the high international coppe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21C37/06B21J7/16B21J1/06
Inventor 刘新华谢建新刘雪峰
Owner UNIV OF SCI & TECH BEIJING
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