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Rolling process of composite brazing aluminium foil with high brazing performance

A processing technology and composite aluminum technology, which is applied in the field of material rolling and forming, can solve the problems affecting the performance of radiators, high temperature softening deformation, low brazing performance, etc., and achieve low sag value, small erosion degree, and brazing performance excellent effect

Inactive Publication Date: 2007-12-19
SOUTHWEST ALUMINUM GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, most automobile radiators are made of double-sided composite aluminum brazing foil strips and aluminum alloy fluid tubes assembled by high-temperature brazing. The composite brazing foil is required to have good brazing and heat dissipation properties, and should also have good Anti-sagging performance, otherwise it is easy to cause high-temperature softening and deformation when brazing at a high temperature of about 600 ° C, which will affect the performance of the radiator
Since the heat exchanger production line has strict requirements on the comprehensive technical quality of the aluminum alloy composite plate, the current composite brazed aluminum foil still has the problems of high sag during brazing and low brazing performance

Method used

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  • Rolling process of composite brazing aluminium foil with high brazing performance
  • Rolling process of composite brazing aluminium foil with high brazing performance
  • Rolling process of composite brazing aluminium foil with high brazing performance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The selected core plate material is 3003 aluminum alloy as the base material, and the cladding alloy material of the cladding plate is 4343 aluminum alloy. The chemical compositions of these two materials are shown in Table 1.

[0019] Table 1 Chemical composition of 3003 and 4343 aluminum alloys

[0020] After cleaning the surface of the core plate and cladding plate by chemical method or physical method, carry out symmetrical cladding at a cladding rate of 13-17%, and after heating, control the hot rolling process to achieve good hot rolling compounding.

[0021] The hot-rolled clad plate is cold-rolled to 0.18mm, held at 380°C for 120min, and then cold-rolled into a 0.11mm composite aluminum brazing foil with a processing rate of 38.8%. The photo of its structure is shown in Figure 1A, from which it can be seen It can be seen that the grains of the foil are larger.

[0022] After the foil material is annealed at 610°C×5min in a standard anti-sag test device, its ...

Embodiment 2

[0024] The processes of alloy material, surface cleaning treatment, cladding operation, heating and hot-rolling compounding are the same as those in Example 1.

[0025] The hot-rolled composite plate is cold-rolled to 0.2mm, kept at 400°C for 80 minutes, and then cold-rolled into a 0.16mm composite aluminum brazing foil with a processing rate of 20%. The photo of its structure is shown in Figure 2A. It can be seen from the photo The grains of the foil material are relatively small.

[0026] After the foil material was annealed at 610°C×5min in the anti-sagging test device, its structure photo is shown in Figure 2B, which shows that the grain structure of the core material is relatively coarse, and the sag value is 7.3, indicating that its brazing performance and anti-sagging performance are excellent.

Embodiment 3

[0028] The processes of alloy material, surface cleaning treatment, cladding operation, heating and hot-rolling compounding are the same as those in Example 1.

[0029] The hot-rolled composite plate is cold-rolled to 0.26mm, held at 440°C for 60 minutes, and then cold-rolled into a 0.16mm composite aluminum brazing foil with a processing rate of 38.46%. The photo of its structure is shown in Figure 3A. The internal grain structure small.

[0030] After the foil material was annealed at 610°C×5min in the anti-sag test device, its structure photo is shown in Figure 3B. The core material has a large grain structure and a sag value of 8.5, indicating excellent brazing performance and sag resistance.

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Abstract

The rolling process of composite brazing aluminum foil with high brazing performance includes the following steps: surface cleaning of the base alloy 3003 and cladding alloy 4343, symmetrically cladding, heating and hot rolling for combining the core material and the cladding material, cold rolling to certain thickness, annealing at 380-440 deg.c for 60-120min, and final cold rolling in the working rate of 10-40 % to obtain the composite brazing aluminum foil. The rolling process with annealing and final controlled cold rolling can raise the brazing performance of the composite foil.

Description

technical field [0001] The invention belongs to the field of material rolling processing and forming, and in particular relates to a rolling processing technology for improving the brazing performance of composite aluminum brazing foil. Background technique [0002] Aluminum alloy composite panels are key materials for air separation equipment and heat exchangers for auto parts, which are difficult to produce and require high technical requirements. It is made of one or both sides of the cladding alloy covering the matrix alloy, and then compound rolled. Both the matrix alloy and the cladding layer alloy are new alloys specially developed according to the requirements of different structures, different brazing methods, and different uses of heat exchangers. [0003] Multi-layer aluminum alloy composite tape for automobile radiator is another fruitful application of this new material. The car radiator is the heat exchange element in the car, which includes the water tank, c...

Claims

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Application Information

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IPC IPC(8): B21B1/38C21D9/46C21D11/00
Inventor 尹晓辉林林黄光杰李翔
Owner SOUTHWEST ALUMINUM GRP
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