Cast aluminum alloy has some advantages that other castings cannot match, such as beautiful appearance, light weight, corrosion resistance, etc., which makes it widely favored by users. Especially since the lightweight of automobiles, cast aluminum alloy castings have been widely used in the automobile industry. Applications.
The density of cast aluminum alloy is lower than that of cast iron and cast steel, but its specific strength is higher. Therefore, the use of aluminum alloy castings under the same load conditions can reduce the weight of the structure. Therefore, aluminum alloy castings are widely used in the aviation industry, power machinery and transportation machinery manufacturing. Aluminum alloy has good surface gloss and good corrosion resistance in the atmosphere and fresh water, so it has a wide range of uses in the manufacture of civil utensils. Pure aluminum has good corrosion resistance in oxidizing acid media such as nitric acid and acetic acid, so aluminum castings also have certain uses in the chemical industry. Pure aluminum and aluminum alloys have good thermal conductivity. They are used in heat exchange devices used in chemical production, and parts that require good thermal conductivity on power machinery, such as the cylinder heads and pistons of internal combustion engines. They are also suitable for aluminum alloys. manufacture.
Aluminum alloy has good casting properties. Because of the low melting point, casting methods such as metal molds and pressure casting can be widely used to improve the inherent quality, dimensional accuracy, surface finish and production efficiency of the castings. Due to the large latent heat of solidification of aluminum alloy, under the same weight conditions, the solidification process of molten aluminum lasts much longer than cast steel and cast iron, and has good liquidity, which is conducive to casting thin-walled and complex-structured castings.
Cast aluminum alloy castings have many advantages, making it the development direction of the casting industry and one of the most popular casting products for purchasing customers. In the future, with the advancement of aluminum alloy casting technology, it will show its own on a larger stage. Demeanor.
Analysis of urgent problems to be solved in the future development of domestic aluminum alloy casting industry
Reducing energy consumption, reducing environmental pollution and saving limited resources is a very important and urgent task facing all countries today. Driven by the general trend of lightweight products such as automobiles, it can be predicted that my country's light metal casting market will have a substantial development in the next 10 years. The proportion of aluminum and magnesium alloy castings in the major casting production countries is between 13% and 19%, and in some countries it is as high as 30% to 40%, while the proportion of aluminum and magnesium alloy castings in my country is less than 10%. More than 90% of aluminum castings in developed countries are used in automobile parts manufacturing. In my country, there are still many problems to be solved for aluminum alloy die castings to form large-scale production and meet the requirements of automobile lightweight: First, the requirements of automobiles on aluminum castings It is developing towards the direction of thin wall, complex shape, high strength and high quality. In order to meet this requirement, the casting process should be further optimized and the development of new alloy materials should be carried out. Second, the production cost should be reduced from the perspective of design and process, such as the use of one-mold multi-part technology and automation technology to increase productivity, extend the service life of the mold, and use an integrated design to reduce the number of die-casting mechanical vehicle parts. Third, use computer simulation technology to shorten the development cycle of the process plan. Fourth, increase the recovery of aluminum. Recycled aluminum is the main raw material of aluminum casting. While developing the foundry industry, my country should pay attention to the utilization of recycled aluminum resources, develop technologies to effectively separate aluminum from composite and dissimilar materials, and establish a wide range of waste recycling systems.
