Effect of metal foam on vibration damping and its modelling

Paolo Albertelli,Massimo Goletti,Valerio Mussi,Michele Monno,Stefano Esposito

doi:10.1007/s00170-021-07172-6

Paolo Albertelli, Massimo Goletti + Show 3 more

Open Access

https://doi.org/10.1007/s00170-021-07172-6

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Abstract

The use of metal foams for damping vibrations of mechanical structures has found interesting applications in machine tools and its components. Indeed, undesired vibration is one of the most detrimental causes that limit the machine performance in terms of the maximum achievable material removal rate MRR. Although positive results were presented in some research works, a methodology for predicting the damping properties of such materials in the machine tool design phase using finite element codes is still missing. In order to bridge this gap, in this paper, an experimental procedure for identifying the damping contribution of the aluminum metal foam to the hosting structure is proposed. The experimental data are even used to develop a model for predicting the damping. The procedure is further validated on a dummy structure.

Highlights

The performance of machine tools can be affected by the presence of undesired vibrations, which negatively influence the maximum achievable material removal rate (MMR) and the tracking accuracy of axis
Vibrations can lead to the failure of components such as spindle bearings. This issue becomes more relevant in high-speed machining, in which the high cutting speeds lead to major problems concerning the dynamic of machine tools and vibrations of its components
Dynamic characteristics of mechanical structures become fundamental in order to avoid dangerous vibrations

Summary

Introduction

The performance of machine tools can be affected by the presence of undesired vibrations, which negatively influence the maximum achievable material removal rate (MMR) and the tracking accuracy of axis. Vibrations can lead to the failure of components such as spindle bearings. This issue becomes more relevant in high-speed machining, in which the high cutting speeds lead to major problems concerning the dynamic of machine tools and vibrations of its components. Dynamic characteristics of mechanical structures become fundamental in order to avoid dangerous vibrations. In this scenario, damping properties, which are the capacity of reducing oscillations by dissipation of mechanical energy, assume a key role. Material (or internal) damping and structural damping are the main source of damping to be

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Conclusion