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Machinability and corrosion resistance of aluminum castings

Views: 11     Author: Site Editor     Publish Time: 2018-09-13      Origin: Site

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The application range of aluminum die casting is very wide, involving a considerable number of product fields and industrial categories. In all of these applications, the automobile industry should be promoted in terms of quantity, variety, severity, quality and quantity of metal materials.

 

Aluminum alloy die casting parts have good corrosion resistance because of a thin, compact continuous oxide film on its surface. Aluminum alloy has great advantages in production and processing. Aluminum itself has a soft, face-centered cubic crystal structure, so it is essentially easy to process and can be processed by general deformation techniques. In addition, aluminum has rapid and economical mechanical processing, especially for those conventional casting alloys and bars made of special free-cutting alloys.

 

The application of aluminum casting products in the world automobile manufacturing industry can be generally divided into two stages. Before the 1970s, it mainly considered from the perspective of "novelty" to attract consumers. After the mid-1970s, a large number of aluminum casting products were adopted to save energy, reduce emissions and reduce the weight of vehicles. Aluminum alloy can reduce the quality of the whole car by 30%-40% instead of the traditional steel parts. The engine can be reduced by 30%. The cylinder block and cylinder cover can be reduced by 30%-40%. The automobile industry accounts for between 62% and 73% of the world's total aluminum castings.

 

In engine casting aluminum alloys, currently used in the United States is the 390 alloy, which is an al-si-cu alloy. In the automobile industry, the traditional al-si alloy occupies a prominent position. The alloy used in the United States for die casting such as cylinder block and gearbox shell is 380, the alloy used for piston is F322, the alloy used for sand mold and metal mold castings is 319 and 356 aluminum alloy respectively, while the alloy used for making aluminum wheels is A356 aluminum alloy.

 

In recent years, due to the high performance of 390 aluminum alloy, this alloy has been widely used by automobile manufacturers in the United States and Europe. It is especially suitable for manufacturing engine parts, such as cylinder block, transmission case, main brake cylinder, air machine case and pump case.

 

The new 3HA aluminum alloy developed by Comolco of Australia is similar to 390 aluminum alloy, and also has high wear resistance. It is especially suitable for making parts with good wear resistance under sliding condition and periodic action stress condition.

 

Although the cost of 3HA aluminum alloy is a little higher than that of normal aluminum alloy (about 10% higher than that of 356 aluminum alloy), it can be fully compensated from the use benefit. This alloy, like 390 aluminum alloy, has been used in motorcycle, car 4 cylinder engine block batch production.


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