Steel wheel hub and aluminum alloy wheel hub are common types of automobile casting wheel hub. Steel casting wheel hub bears high strength, so it is often used in large trucks. However, the quality of steel casting hub is relatively heavy, and the shape is relatively single, which is contrary to the concept of sustainable development and low-carbon environmental protection, and is gradually replaced by aluminum alloy casting hub. The aluminum alloy casting wheel hub is beautiful and generous, very light, which can ensure that the car is more fashionable. Aluminum alloy casting hub can save more materials and reduce energy consumption, which is in line with the concept of low-carbon and environmental protection. However, some casting defects often appear in the casting process, which seriously affect the quality of aluminum alloy casting hub, so an in-depth analysis will be carried out.
Aluminum alloy casting wheel hub is refined into crucible and coke furnace. There are three main problems in this regard:
① When the residue produced by coke after combustion can be fused with liquid metal, it will directly affect the quality of castings.
② When the temperature of molten metal is not strictly controlled, when the temperature is high, it can lead to overflow of molten metal and burn. Liquid metal contains more air, so pores can appear in the process of die casting, affecting the quality of castings. When the temperature is too high or too low, the metal can not be formed as soon as possible. The gettering ability of molten alloy is relatively high, so it can not exhaust the gas. Therefore, after crystallization, there are more pores, resulting in casting defects.
③ There are dirt and impurities in the crucible and they are not cleaned, which can affect the quality of aluminum alloy. The holding time of crucible is relatively long, which can directly reduce the quality of castings.
To sum up, aluminum alloy casting hub has the advantages of beauty and energy saving, so it is widely used. When we can master the casting method and strengthen the standardized operation, we can avoid the existing problems, ensure that the product quality meets the specified standards, and show the advantages of aluminum alloy casting hub to the greatest extent. From the material, size and accuracy, we can judge whether the quality of aluminum alloy cast hub meets the standard. Only by truly solving the problems existing in casting and ensuring the quality of aluminum alloy casting hub, can we ensure the safe operation of enterprises and provide guarantee for people’s safety.