Modelling and characterisation of geometric errors on 5-axis machine-tool

• Published in: Mechanics & industry : an international journal on mechanical sciences and engineering applications Vol. 20; no. 6; p. 605
• Main Authors: Viprey, Fabien, Nouira, Hichem, Lavernhe, Sylvain, Tournier, Christophe
• Format: Journal Article
• Language: English
• Published: Villeurbanne EDP Sciences 2019
• Subjects: 5-axis machine tool; Axes (reference lines); Bias; Dimensional measurement; Engineering Sciences; Error analysis; geometric errors; Geometry; identification; Machine tools; material standard; Mathematical models; Modelling; Parameter identification; Parameterization; geometric errors; identification; 5-axis machine tool; modelling; material standard
• ISSN: 2257-7777; 2257-7750
• DOI: 10.1051/meca/2019034

This research work deals with the geometric modelling of 5-axis machine tool based on a standardised parameterisation of geometric errors with the aim to decrease the volumetric error in the workspace. The identification of the model’s parameters is based on the development of a new standard thermo-invariant material namely the Multi-Feature Bar. Thanks to its calibration and a European intercomparison, it now provides a direct metrological traceability to the SI metre for dimensional measurement on machine tool in a hostile environment. The identification of three intrinsic parameters of this standard, coupled with a measurement procedure ensures a complete and traceable identification of motion errors of linear axes. An identification procedure of location and orientation errors of axes is proposed by probing a datum sphere in the workspace and minimising the time drift of the structural loop and the effects of the previously identified motion errors. Finally, the developed model partially identified, allows the characterisation of 95% of the measured volumetric error. Therefore, the mean volumetric error not characterised by the model only amounts to 8 μm.