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One of the biggest challenges in designing a multi-material structure is determining the joining methods between parts made in different metals. Contact between bare aluminum and steel can lead to galvanic corrosion, so mitigation strategies needed to be devised.


在设计由不同材质组成的结构中,选择不 同材质零部件的连接方式是最大的挑战。 直接将铝合金和合金钢连接将引起电化学 腐蚀,因此,应设计缓解措施。


advanced vehicle engineering details. In this case, Magna and Ford started with an advanced design associated with a 2013 model year vehicle, comprised of the most current materials and manufacturing processing available. Te partners established a goal of reducing the vehicle mass to that of the Ford Fiesta, while maintaining occupant safety and performance characteristics of the baseline Fusion vehicle. Tis would enable the use of the smaller three cylinder 1.0 liter EcoBoost engine used in the Fiesta. Reducing the engine size would further reduce weight and also equate to a reduction in fuel consumption. In total, the MMLV weighed 800 lbs. (364kg) less than the baseline 2013 Ford Fusion. “Te message was, if you go for a weight reduction, you


have to go for sufficient quantity to enable use of a down- sized engine,” Skszek said. “Forty percent of the fuel reduc- tion and environmental benefits of the program are due to primary mass reduction, but 60% is associated with the ability to downsize the engine while maintaining the vehicle performance.” To meet the weight reduction goal, Magna and Ford designed a bimetallic body-in-white (BIW) that was 65%


车公司从2013款汽车有关的先进设计开始,包括最新 的材料和生产工艺。


两家合作方确立的整车的减重目标为达到福特嘉年华 的重量水平,同时还要保证驾驶员安全和福星汽车的运 动特性。可行性的方案是把较小的3缸1.0升的Eco- Boost发动机用于嘉年华车型中。缩小发动机的尺寸将 进一步减轻其重量,同时减少燃油消耗。最后,MMLV 项目测量该汽车比基准的2013款福特福星汽车重量减 轻800磅(364kg)。


“得出的结论是,如果以减轻汽车重量为目标,则 必须寻找足够多的可行性方案使用较小尺寸设计的发动 机,”Skszek说:“项目所带来的燃料节约和环保的效 益,40%要归功于汽车重量的减少,但是,另外60%则 要归功于在保证车辆性能的前提下发动机更紧凑的尺寸 设计。”


为了达到减轻重量的目标,Magna公司和福特汽车


In the MMLV, steel was placed in areas where requirements for energy absorption for side impact, roof crushing and frontal impact protection were high. Aluminum was placed around the steel—such as in the major panels, which were not structural.


在MMLV项目中,在侧面碰撞、车顶粉碎 和正面碰撞对于能量吸收要求高的位置使用 了合金钢。在合金钢周边使用了铝合金,例 如非结构件的主覆盖板。


December 2015 FOUNDRY-PLANET.COM | MODERN CASTING | CHINA FOUNDRY ASSOCIATION | 49


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