Optimierung des thermischen Verhaltens von Fräsmaschinen

This paper presents a method for optimisation of thermal behaviour of a milling machine due to spindle load which was developed within the framework of the project "NEXT" funded and supported by the EC. The thermo-elastic machine behaviour, i.e. the stress dependent temperature distribution and the resulting deformation of the machine tool, is influenced by a variety of design and thermo-technical parameters [1-3]. Therefore WZL develops an indirect thermal compensation method. The thermo-elastic machine behaviour is experimentally determined in a calibration procedure based on spindle speed and effective power using a stressing unit. The transfer function between speed and power of the spindle as an input and displacement of the TCP as an output can be written as a sum of second order time delay functions.