Investigation of Components and Assembly Groups

Abstract

Machine tools comprise thermally active and passive components. This results in a heterogeneous temperature field, which may cause displacements inside the machine and, ultimately, a TCP displacement. In subproject B03, the individual components are subjected to metrological study and transformed into a simulation model in order to obtain a simulation representation of the thermo-elastic machine tool behaviour. In the methodology to determine the complete machine behaviour, a distinction is made between a top-down- and a bottom-up approach. In the first case, the behaviour of the complete machine is analysed and synchronized with the simulation model. Thus, for instance, it is possible to represent the behaviour of the passive components. In the second case, the thermally active components—ball screws, guidance systems and the main spindle—of the machine tool are individually studied on test beds. Information gleaned from the investigations conducted on the test beds and the models derived from them are added to the complete machine model, where they are employed to identify the complete temperature- and displacement field. To exclude the ambient influence as much as possible, the test beds are installed in a climatic chamber.