Rearch And Devolpment On Magnesium Alloy Wheels Of Electric Bicycles

Energy crisis and environmental problem have been more and more critical. As a result, magnesium alloy, the lightest structural metal material known, is attracting much more attentions around the world. Since 1990, US, Japan, Germany, Australia etc. sequentially announced research projects on magnesium alloy, which is considered as the key subject of study and research in the 21st century. China's Ministry of Science also specially announced the significant projects, "Development, Application and Industrialization of Magnesium", in the "10th Five- -Year Plan" national key science program. This paper proposed a developmental process of magnesium alloy wheels used for electric bicycle based on this background.This paper mainly worked on redesigning of material substitution. Firstly, the redesign method of product material substitution is analyzed. Then, a common model about this is proposed. Based on the model, the research is carried out in the three aspects of structure design and molding process and product test.Six improved projects of wheel structure are analyzed through the Finite element simulation of its static load test and dynamic bending fatigue test. The result shows that increasing me whole width of spoke can decrease the stress of the wheel effectively and the stress tends to be symmetrical. According this result, a new wheel is designed and the capability of wheel is meet by analyzed.The method about molding process of magnesium alloy wheel is many. But many of them present in researching. Based on orthogonal tests and FEM, die-casting process is simulated. Through detailing with the data, using the method of cascade deviation, the result is gotten that the most significant factor in die-casting process is the cross-section area of inlet, next is mould temperature, mold filling velocity, melt temperature and diameter of vertical path. Through drawing factor horizontal tendency chart, an excellent scheme of A₁B₂C₂D₂E₂ is concluded.An apparatus is designed to test the fatigue of wheel based on the dynamic bending fatigue test. dye penetration inspection. There are no splits or breaks found on the surface by checked with dye penetration inspection. The wheel meets the standard.