| At the present, the environmental issues, energy issues and security issues are the most issue, which gets people’s attention extensively. In order to protect environment and reduce pollution, the action of automobile lightweight route in the automotive industry is very important. With the further development of the material, aluminum alloy has been recognized as the most effective route to realize auto lightweight material. The wheel of a car is not only the important parts of automobile bearing, is but also the only appearance parts of the car that is running safely. Therefore, it is vital significance to study the mechanical properties of wheel hub. In the present paper, the mechanical properties of the casting and spin casting state aluminum alloy wheel is investigated mainly. The stress of 88888 type wheel hub is analyzed by the finite element software under the radial load, bending load and impact load. In order to improve the mechanical properties of 88888 type wheel hub, the 88888 type wheel hub is solution-treated and aging-treated.The results show that the chemical composition of the casting and spin casting state hub is mainly composed of Al, Si, Mg, Ti, Fe, Cu, Zn, Mn and other alloy elements. The eutectic microstrucutre and alpha–Al are uniformly distributed in the matrix of the outer rim, inner rim, spokes and the wheel center site of the casting and spin casting state wheel hub. The Si phase in the matrix is small granular. The mechanical properties of the casting and spin casting state wheel hub reached the requirements prescribed by the company.In the process of the finite element analysis, the maximum stress value the 88888 type wheel hub is 114.1 MPa at the spoke and 114.7 MPa at the windows of the wheel hub for the radial fatigue test, and is 111.0 MPa in the x direction and 108.7 MPa in the Y direction for the bending impact test. For the the impact process of 13 degrees, the maximum strain rate values of the 88888 type wheel hub were 5.169%, 5.829% and 6.165% at the impact test positon of 0 degree, 90 degree and 180 degree, respectively.For The 13 degree impact test process of the original state wheel hub, the mechanical properties do not meet the requirements of the impact performance of wheel hub due to the large amount of shrinkage porosity and fracture crack. However, the mechanical properties of the original state wheel hub has been improved significantly after solid solution and aging heat treatment and can meet the requirements of wheel hub prescribed by the company. |
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