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Oil cooler brazing
Oil cooler brazing is an important spare part of the automobile body. It is an important part to ensure the safe operation and life of the automobile engine. Its structure is complicated. Most of the mainstream oil coolers sold on the market today adopt a multi-layer densely arranged sawtooth type error. The all-aluminum integrally welded complex structure in which the fins are connected to the bottom plate. The structure oil cooler has the advantages of small volume, light weight, large heat dissipation area and high heat dissipation efficiency. It is a scientific problem worthy of study to ensure the high quality connection between the fins of the complex structural member and the partition plate and the partition plate and the bottom plate. Because the good connection quality can not only play an excellent heat dissipation effect, but also can improve the service life of the oil cooler, reduce the maintenance cost of the automobile, improve the competitiveness of the automobile production enterprise, and save resources.
Vacuum brazing technology has become a promising welding technology since the 1940s. The first parts to braze copper and stainless steel in the electronics industry were later applied to the aerospace industry and the atomic energy industry. In 1959, they were applied to the manufacture of stainless steel plate-fin heat exchangers. It is now widely used in plate-fin heat exchangers and coolers in industrial sectors such as air separation plants, petrochemical plants, construction machinery, automobiles, boats and home appliances.
Vacuum brazed plate-fin oil coolers are used in cars and boats. The plate-finned oil cooler has the characteristics of high heat transfer efficiency, compact structure and light weight. It is a new generation of diesel engine coolers and has been widely used in automobiles, tractors, marine diesel engines and other fields.
There are only a few manufacturers of such plate-fin oil coolers in China, and they are all welded with silver-copper alloy. Each unit consumes 150 grams of silver, and the cooler made of silver-free copper vacuum brazing process is not only a country. It saves a lot of expensive silver and has good air tightness. The brazed product is tested by air pressure of 10kg·f/cm2 without leakage and leakage. It has high cleanliness and good surface gloss. It is used on diesel engines. The thermal performance reached the specified index of the t· diesel plate-finned water-cooled oil cooler issued by the Ministry of Machinery Industry. It was immersed in water for 115 hours, and the surface was free from rust corrosion, which greatly reduced the production cost.
In 1984, the Czech Republic introduced a small continuous vacuum brazing furnace from the UK to produce a shovel-heater on the Skoda truck, with an annual output of more than 10,000 units. In 1971, Ford Motor Company began to use the true brazing process to produce aluminum radiator cores. Among the car radiators produced in 1984, aluminum accounted for 20%. Later, the aluminum radiator production lines of the two factories in the subordinates were technically transformed. It is estimated that after the technical transformation, it could reach 3 million units in 1985. Ford’s technical transformation of the production line is due to the light weight of the aluminum radiator and good heat exchange performance. Therefore, the number of aluminum radiators used in Ford Motor Company’s passenger cars, light trucks, and trucks is 90% to 95%.
Japan Furukawa Aluminum Industry Co., Ltd. has developed a new type of alloy (CF series) suitable for vacuum brazing automotive heat exchanger fins, which has been mass-produced. This new CF series alloy is added to aluminum, zinc and manganese. ~0.3% alloy of calcium. It can be used as a heat sink for heat transfer, and the new alloy improves corrosion resistance and service life. According to interest rates, aluminum for automotive heat exchangers accounts for 80% to 90% in Europe, 50% in the US, and 15% in Japan. Therefore, Japan’s Furukawa Aluminum Industry Co., Ltd. has launched the CF series of new aluminum alloys, which will undoubtedly promote the aluminum alloy of Japan’s automotive heat exchangers.
Now, there are more than 20 vacuum brazed parts on a single car. It can be seen that vacuum brazing technology has a great effect, good effect and wide application.