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Hollow Spheres Made Of Metal

原文:
New drive technologies combined with lighter and stronger materials will make the airplanes and automobiles of the future more fuel-efficient. But a number of technical details need to be resolved first. Magnetic ball valves are one example – for Forged Steel Valves them to react extremely quickly, the balls must be as light as possible, and the same applies to rapidly moving bearings. Hollow spheres made of steel represent a solution.
Researchers at the Fraunhofer Institute for Manufacturing and Advanced Materials IFAM in Dresden working in cooperation with hollomet GmbH Dresden have created the technology for the manufacture of rapidly reacting ball valves and bearings. “In an injection valve the movement of a ball causes the valve to open and close. The lighter the ball, the quicker it moves,” explains Dr.-Ing. Hartmut G?hler, project manager at the IFAM. Until now it has only been possible to produce balls of this size as solid spheres, but a solid body is relatively heavy and therefore reacts slowly in Needle Valves a ball valve. “For the first time we’ve been able to produce metal hollow spheres in the required diameter of just two to ten millimeters. The hollow spheres are 40 to 70 percent lighter than solid ones.”
The process starts with polystyrene balls which are lifted up and held by an air current over a fluidized bed while a suspension consisting of metal powder and binder is sprayed onto them. When the metal layer on the balls is thick enough, heat treatment begins, in which all the organic components, the polystyrene and the binder evaporate. The residual Filter materials are gaseous and escape through the pores in the metal layer. A fragile ball of metal remains. This is now sintered at just below melting temperature, and the metal powder granules bind together, forming a hard and cohesive shell. The sphere is now stable enough to be ground in a machine, but the pressure must not be too high as otherwise the hollow body will deform. The wall thickness can be set to between a few tenths of a millimeter and one millimeter.
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译文:
新驱动更轻更坚固的材料组合技术,使飞机和未来的汽车更省油效率。但有一些技术细节需要先解决。磁性球阀就是一个例子-他们的反应非常快,球要尽可能轻的,同样适用于快速移动的轴承。以钢材制成的空心球代表了解决办法。
在制造业和先进材料IFAM在德累斯顿Fraunhofer研究所的研究人员在德累斯顿与hollomet公司合作工作创造了快速反应的球阀和轴承制造技术。 “在一个喷射阀球的运动使阀门开启和关闭。较轻的球,动作越快,“解释博士工程师。哈特穆特G?hler,项目经理在IFAM。到目前为止,它只是有可能产生的一个坚实的球体的大小球,但稳固的身体比较重,因此在反应缓慢球阀。 “这是第一次,我们已经能够生产的两至10毫米所需直径的金属空心球。空心球是40至70比百分之坚实的打火机。“
启动的过程是取消了,由一个气流举行了流化床而悬浮金属粉末和粘结剂组成的喷洒到他们聚苯乙烯球。当球上的金属层厚度不够,热处理开始,所有的有机组成部分,聚苯乙烯和粘合剂蒸发。材料的剩余气体和逃避通过在金属层孔隙。一个金属球仍然是脆弱的。现在这是烧结仅低于熔点温度和金属粉末颗粒结合在一起,形成一个硬外壳和凝聚力。球体现在是稳定的,可以在一台地上,但压力不要太大,否则对身体会变形空心高。壁厚可以设置为1毫米之间,并一毫米零点几秒。