Modeling the thermal machine tool error during cooling lubricant usage

Abstract

The thermo-elastic machine tool error, which is one of the main error sources in a machine tool, can be modeled and corrected using the machine control. In the past, the models to do so have been parametrized using precise measurement equipment like lasertracers. However, these lasertracers cannot be used to measure the thermo-elastic error during cooling lubricant usage, which is necessary for most industrial applications. Therefore, this paper presents a method on how to measure the thermo-elastic machine behavior using Integral Deformation Sensors to compute the tool center point displacement during coolant usage based on a white box modeling approach. These computed displacements are then used to parametrize a correction model that uses low order delays elements.