Application of the hottest composite brazing alumi

2022-10-20
  • Detail

Application of composite brazed aluminum foil technology in the production of automotive heat exchangers

1 preface

automotive heat exchangers include radiators, air coolers, condensers and evaporators, which mainly consume various specifications of plates, strips, foils and welded pipes. Automobile heat exchangers with accurate and reliable experimental data are mainly made of copper and tin. At present, a new production process of automobile heat exchanger - composite brazing aluminum foil technology has shown a good application prospect in the rapid development of automobile production

2 development of composite brazing aluminum foil technology

because aluminum alloy has a series of excellent characteristics, one of the main ways to realize automobile lightweight is to improve the degree of Aluminization of automobile materials. Data statistics show that the quality of automobile radiator can be reduced by 37% - 45% by replacing copper foil with composite brazed aluminum foil. Therefore, the Aluminization rate of automobile heat exchanger parts in developed countries has reached more than 95%. The application of aluminum alloy in the production of automotive heat exchangers began in the 1980s. At that time, due to the development of vacuum brazing technology, 50% of automobiles produced in the United States were installed with composite brazed aluminum foil heat exchangers

by the 1990s, the use rate of composite brazed aluminum foil for automotive heat exchangers in industrialized countries had reached more than 90%. This is not only because the price of aluminum is lower than that of copper, but also because the quality of automobile radiator made of composite brazed aluminum foil is significantly lower than that of similar products made of copper foil, which greatly promotes the development of automobile lightweight

the use of composite brazed aluminum foil for automotive heat exchangers in China began in the 1990s. The consumption of composite brazed aluminum foil in China was only 1000 tons in 1993, 3000 tons in 1994, and 5000 tons in 1995. In recent years, with the rapid development of China's automobile industry, the annual output of automobiles has reached 3million. If 90% of the off-line vehicles use the composite brazed aluminum foil technology to manufacture automotive heat exchangers, the annual demand for composite brazed aluminum foil will reach 45000 tons. It is expected that the demand for composite brazed aluminum foil for automotive heat exchangers will reach 80000 tons by 2010

however, what is incompatible with such a broad demand prospect is that China's current composite brazed aluminum foil is still at a low level in terms of both output and quality. At present, only a few manufacturers such as Northeast Light Alloy Co., Ltd. and Shanghai Sapa heat conduction Co., Ltd. can produce composite brazing aluminum foil in China, with a total output of only 15000 tons, and most products can only rely on imports

therefore, the development of high-tech industrial projects focusing on the production of composite brazed aluminum foil for automotive heat exchangers is of great significance to accelerate the localization of automotive raw materials

3 introduction to composite brazing aluminum foil technology

composite brazing aluminum foil for automotive heat exchanger is made of Al Mn alloy as the core material and Al Si alloy filler metal with 10% thickness of the matrix coated on both sides. The development of these technologies using hot rolling process is still in progress

as heat exchanger fins that need to withstand high temperature conditions, there are strict quality standards. It not only requires raw materials to have excellent surface quality, accurate size and flat shape, but also requires raw materials to have uniform microstructure and good formability, especially for the uniformity and weldability of the coating

in the composite brazing aluminum foil technology process, the key link is to strictly control the plate surface treatment, heating temperature, rolling clad procedures and heat treatment process links. At present, the domestic research on metal surface treatment has been in a relatively mature stage, and the new technologies of different temperature heating and different deformation rolling have also been applied to industrial production. The application of these new technologies fully ensures the progressiveness and reliability of the composite brazing aluminum foil technology

at present, environmental protection has become a major focus that cannot be ignored in the development of the automotive industry. Using composite brazed aluminum foil technology to produce automobile heat exchanger will not pollute the environment. First of all, the waste recycling of the milling surface of the metal ingot will not pollute the environment. Secondly, the surface treatment of the plate is also equipped with a dust collector, which will not pollute the environment. At the same time, 90% of the cooling water used by rolling equipment and other equipment can be recycled, and the waste water is non-toxic. The discharge meets the standard, and there is no waste water pollution problem

after decades of construction and development, as well as the introduction of foreign advanced technology and equipment, China's aluminum processing industry has been greatly improved in terms of installed capacity, production capacity and product quality. However, China's aluminum processing industry is not compatible with the rapid development of the automotive industry. Many new automotive materials, such as composite brazed aluminum foil for automotive heat exchangers and aluminum water tank welded pipes, are mainly imported. Therefore, relying on the current rapid development of China's automotive industry, the construction of high-tech and professional composite aluminum foil production lines is an effective development path for domestic aluminum processing enterprises to maintain sustainable development and enhance international competitiveness

4 conclusion

the production of automotive heat exchangers using composite brazing aluminum foil technology will greatly promote the lightweight process of the domestic automotive industry, and make China's automotive industry integrate with the world development trend as soon as possible. It is one of the main directions of China's automotive industry in the early 21st century. (end)

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