Title: Online correction of thermal errors based on a structure model

Authors: Xaver Thiem; Bernd Kauschinger; Steffen Ihlenfeldt

Addresses: TU Dresden, Institut für Werkzeugmaschinen und Steuerungstechnik, 01069 Dresden, Germany ' TU Dresden, Institut für Werkzeugmaschinen und Steuerungstechnik, 01069 Dresden, Germany ' TU Dresden, Institut für Werkzeugmaschinen und Steuerungstechnik, 01069 Dresden, Germany

Abstract: This article deals with the structure model-based correction approach for thermal errors at machine tools. Structure models are physically-based models of the thermo-elastic behaviour of machine tools. Input data of the model are technological loads captured in the machine control. The article focuses the experimental validation of the online correction on the example of a demonstrator machine (parallel kinematic). A finite element model with reduced model order is used as structure model. Besides the implementation of the correction approach the parameter adjustment of the model is described. The conducted experiments show that up to 87% of the maximal thermo-elastic error of the ball screw axes of the machine can be compensated with the proposed correction approach.

Keywords: thermal error; machine tool; correction; compensation; structure model; online; control; parallel kinematics; accuracy; ball screw; finite element method; FEM; temperature; deformation.

DOI: 10.1504/IJMMS.2019.097852

International Journal of Mechatronics and Manufacturing Systems, 2019 Vol.12 No.1, pp.49 - 62

Received: 19 Oct 2017
Accepted: 25 May 2018
Published online: 19 Feb 2019 *

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