Technical background The importance of vehicle lightweight 1. Energy conservation, emission reduction and comfort are the three major themes of the development of the automobile industry. Vehicle fuel consumption and emissions are directly related to its inertial mass: for every 10% decrease in inertial mass, fuel consumption decreases by 6- 8%, Emissions decrease by 3-4%. 2. The inertial mass of each automobile component is related to its working mode and position: the inertial mass of the relatively stationary component is small, and the inertial mass of the rotating or reciprocating component is large; the closer to the chassis, the greater the inertial mass. 3. Weight reduction factor (inertial mass factor) of main components in the car: body: 1; wheel hub: 10-15 (Note: equivalent to 1kg static mass ≈10~15kg inertial mass); engine block: 5-10; piston: 100. 4. Why pay attention to the weight loss of car wheels? One is the independent unit, which has little to do with the body; the other is that the after-sales and OEM markets are equally huge. Technical challenges of magnesium alloy wheels 1. The working characteristics of automobile wheels: automobile safety components and high performance requirements; harsh environments, such as mud, water, flying rocks, rain and snow, etc.; strength and plasticity must be balanced; and fatigue performance requirements are high. 2. There are three major challenges in manufacturing magnesium alloy wheels: suitable materials require high strength and high plasticity (existing commercial magnesium alloys are difficult to meet); magnesium alloy forming processes require suitable magnesium alloys that are easy to oxidize, easy to burn, and narrow process window; can be produced in large quantities and at low cost. 3. Surface treatment technology: high corrosion resistance, scratch resistance, long life. It can be seen from the above that solving the problem of materials, processes and surface treatments is the prerequisite for large-scale application of magnesium alloy wheels. Cooperation method Project investment: The first phase has an annual output of 50,000 units, requiring a standard factory building of 2000 square meters, and an investment of 10 million yuan; cooperation form: overall transfer, joint implementation, technology shareholding, technical services, entrusted development, etc.; Cooperation requirements: It is the best to have supporting resources for the complete vehicle factory, after-installation sales channels and other resources. Technical advantages 1. Adopt independently developed SJTU-LAF magnesium wheel technology;2. Technical level: leading in China;3. Patent status: Yes, invention patent;4. Reliable and stable quality;5. Obvious fuel saving and emission reduction effects. At present, this technology has entered the biotrial stage, and there are products that are waiting to be industrialized. In addition, the two generations of products are as follows: 1. The first generation wheel hub: the overall low-pressure cast magnesium alloy wheel hub below 18 "(1) The casting is highly dense and has no shrinkage porosity in X-ray inspection;(2) The spoke/rim joint under the metallographic microscope (typical hot spot) There is also a very small amount of microscopic porosity;(3) The mechanical properties of the body sample reach the material property reduction rate of 85-90%;(4) The average performance of the rim: 270MPa (UTS)-143MPa(YS)-7.6%(E). Magnesium wheel samples (cast) of various wheel types from 12 "to 18" are shown in Figure 1, and performance tests are shown in Figure 2. 2. Second-generation wheel hubs: A 20 "cast rotating magnesium alloy wheel hub sample has been successfully developed, as shown in Figure 3. Application areas of this technology: personalized after-installation markets such as automobile factory front installation, high-end racing car modification, maintenance and replacement, and personal modification.