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

机译：5轴机床上几何误差的建模与表征

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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.
机译：本研究工作涉及基于几何误差的标准化参数的5轴机床的几何建模，其目的是降低工作空间中的体积误差。该模型参数的识别是基于开发新的标准热不变材料，即多特征栏。由于其校准和欧洲的互相，它现在为敌对环境中的机床尺寸测量提供了直接的计量性可追溯性。识别该标准的三个内在参数，耦合与测量过程确保了线性轴的运动误差的完全和可追踪识别。通过探测工作空间中的基准球并最小化结构循环的时间漂移​​以及先前识别的运动误差的效果来提出轴的位置和方向误差的识别过程。最后，部分识别的开发模型允许表征95％的测量体积误差。因此，模型的均值误差仅为8μm。

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