Casting aluminum alloy has some advantages unmatched by other castings, such as beauty, light weight, corrosion resistance and other advantages, making it widely user's favor, especially in the light of the car, casting aluminum alloy castings in the automotive industry has been widely Applications.
The density of cast aluminum alloy is lower than cast iron and cast steel, while the specific strength is higher. Therefore, under the same load conditions using aluminum alloy castings, can reduce the weight of the structure, it is in the aviation industry and power machinery and transport machinery manufacturing, aluminum alloy castings are widely used. Aluminum has a good surface gloss, in the atmosphere and fresh water has good corrosion resistance, it is in the manufacture of civilian vessels, has a wide range of uses. Pure aluminum in nitric acid and acetic acid and other oxidizing acid medium has good corrosion resistance, and therefore aluminum casting in the chemical industry also has some uses. Pure aluminum and aluminum alloy have good thermal conductivity, on the heat exchange devices used in chemical production, as well as the parts on the power machinery that require good thermal conductivity, such as the cylinder head and piston of the internal combustion engine, are also suitable for use with aluminum alloy manufacture.
Aluminum alloy has good casting performance. As the melting point is low (pure aluminum melting point 660.230C, aluminum casting temperature is generally about 730 ~ 750oC or so), it can be widely used metal and pressure casting casting method to improve the inherent quality of castings, dimensional accuracy and surface Smoothness and production efficiency. Due to the large latent heat of solidification of the aluminum alloy, the solidification time of the aluminum liquid is much longer than that of the cast steel and the cast iron under the same weight, and the liquid flow is good, which is good for casting the thin-walled and complex-structure castings.
Cast aluminum alloy casting has many advantages, making it a casting industry's development direction and procurement of the most popular casting products, the future with the progress of aluminum alloy casting technology, it will be on the stage to showcase their own Style.
An Analysis of Problems to be Solved in the Future Development of Domestic Aluminum Alloy Castings
Reducing energy consumption, reducing environmental pollution and saving limited resources are a very important and urgent task for all countries today. Driven by the overall trend of lightweighting of automobiles and other products, it can be predicted that there will be a substantial development of China's light metal casting market in the next 10 years. The proportion of aluminum and magnesium alloy castings in each casting production country is between 13% and 19%, and in some countries (eg Italy) is as high as 30% to 40%. However, the proportion of aluminum and magnesium alloy castings in China To 10%. In developed countries, more than 90% of aluminum castings are used in the manufacturing of automobile parts. In our country, there are still many problems to be solved in order to form large-scale production of aluminum alloy castings and meet the requirements of lightweighting automobiles. First, Thin-walled, complex shape, high strength, high-quality direction. In order to meet this requirement, the casting process should be further optimized and new alloy materials developed. Second, the cost of production should be reduced from a design and process point of view, such as the use of multiple mold and automation technologies to increase productivity, extend mold life, and reduce the number of parts with an integrated design. Third, the use of computer simulation technology to shorten the development process of the program cycle. Fourth, increase the recovery of aluminum. Recycled aluminum is the main raw material for aluminum casting. In the development of foundry industry, China should pay attention to the utilization of recycled aluminum resources, develop the effective separation of aluminum from the waste of composite materials and dissimilar materials, and establish a wide range of waste recovery systems.
