Modelling of the thermo-elastic behaviour of an externally driven spindle system

 

Current correction methods for the thermo-elastic behavior of main spindle systems, despite the expert knowledge of the manufacturers, are associated with a considerable parameterization effort. The experimental effort is therefore often reduced to a few load cases, which, however, only partially map the complex thermo-elastic operating behavior of spindle systems.

In order to be able to simulate the complex interactions of thermo-elastic behaviour, individual components and assemblies have been investigated in the subproject (TP) B03 of the Collaborative Research Centre/Transregio 96 (SFB/TR 96) and converted into simulation models. In addition, subproject B06 investigated volumetric thermo-elastic displacements of machining centers and subsequently developed a correction algorithm based on the recorded load-displacement behavior.

The existing test benches are now used to investigate the influence of other factors (e.g. size, type of lubrication, preload classes, wiper design, connection geometry and material) on the heat input. Based on the investigations already carried out, the analysis of a main spindle will be advanced. In the further course of the project, the research focus, which was previously mainly focused on the component level, will focus on the thermo-elastic behaviour of assemblies. In addition to the investigations of the feed axis and motor spindle, further investigations are carried out on a production machine.

The aim of the proposed transfer project is to reduce the current experimental effort for parameterizing thermo-elastic correction models to a minimum or to improve the validity of the correction model. This will be achieved by parameterizing the correction model from TP B06 on the basis of the forecast model from TP B03. In order to parameterize the prognosis model, only the friction forces of the bearings for different operating points on spindle bearing test benches have to be determined. Complex parameterization tests on the physical spindle system are no longer necessary.

In this transfer project, proof of industrial suitability is provided jointly with CHIRON-WERKE GmbH & Co. KG on an externally driven spindle.