The wheel hub is an important part of auto parts. It connects the tire and the axle and plays a supporting and guiding role. The material and design of the wheel hub directly affect the driving performance and safety of the car. In order to reduce the mass of the wheel, a new type of lightweight alloy wheel with built-in air alloy wheel came into being, and the mass of the wheel was further reduced by cavity technology. This kind of alloy wheel hub is divided into one-piece type and two-piece combination type. The one-piece built-in air alloy wheel hub uses cavity technology to make all the spokes of the wheel hub and the inner and outer shoulders of the rim into cavities, which greatly reduces The quality of the wheel hub is reduced by 20% compared with the alloy wheel of the same structure, and the use performance is greatly improved; the two-piece combined built-in air alloy wheel makes a cavity at the inner shoulder of the wheel rim, which greatly reduces the quality of the wheel, reduces the weight by 5% compared with the alloy wheel of the same structure, and improves the performance of the product. The manufacturing materials of wheels include cast iron, aluminum alloy, magnesium alloy, etc. Among them, aluminum alloy wheels have the characteristics of light weight, high strength, and good heat dissipation, so they are widely used in the automobile manufacturing industry. The shape and size of the wheel hub also vary with different models and uses. For example, the shape and size of the wheel hub of cars, SUVs, sports car and other models are different.