Development of an empirical model of the spindle bearing damping under consideration of the installation and operating conditions for an application-oriented simulation of the dynamic system behaviour of main spindles

 

The scientific focus of the DFG project is the determination of a damping model in combination with calculated internal contact quantities. This should enable the derivation of a generally valid model for damping in spindle bearings and thus contribute to the prediction of the dynamic behaviour of machine tool spindles.

The procedures and test benches for the determination of damping coefficients for spindle bearings have already been developed in DFG research group 1087 and will be further used for this transfer project. In the first instance, extensive test runs of spindle bearings of different sizes and types are to be carried out. By an external excitation during the tests, dynamic compliance frequency responses can be used to determine the spindle bearing damping. The investigations are to be carried out both at standstill and under the influence of speed. The aim is to investigate the influence of operating parameters such as temperature, lubrication and preload on the damping behaviour.

By the investigations in a broad parameter field and the correlation of the measured damping with calculated inner bearing sizes, it is possible to derive a characteristic diagram model for the spindle bearing damping. This will then be extended to a generally transferable model.