Fraunhofer-Institut für Fertigungstechnik und Angewandte Materialforschung
Rhythmic and accelerated movements caused by machining generate vibrations that are transmitted by lightweight, highly rigid structures with low losses. However, lightweight construction is necessary to increase cycle rates and minimize driving power. For several years sandwich constructions with aluminum foam core layers have been used successfully for lightweight construction of moving assemblies of machine tools. On the one hand, the high stiffness of cover layers allows high precision statically, but on the other hand they prevent dynamic deformation of the aluminum foam, which would be necessary for a damping effect. The lighter the assemblies, the greater the excited amplitudes for the same vibration energy. High amplitudes reduce the precision of metal-cutting machining, limit cycle rates as well as component and tool life, and result in noise emission. Therefore, the desired high sandwich stiffness is counterproductive in terms of good damping. A remedy is provided by particle-filled hollow spheres embedded in aluminum foam. The particles, which move freely in the hollow spheres, damp the vibrations of the component even in the case of rigid-body motion. In the poster, the development of the semi-finished product from vibration damping models to prototype applications will be presented.
Abstract
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Poster
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