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Robust machine tool thermal error compensation modelling based on temperature-sensitive interval segmentation modelling technology

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Abstract

Establishing a mathematical model that can reflect the relationship between temperature increase and thermal error during machining is the core of thermal error compensation technology for CNC machine tools. The collinearity between temperature-sensitive points and the correlation between temperature-sensitive points and thermal errors are important factors affecting the prediction accuracy and robustness of the thermal error compensation model. Based on the thermal error measurement experiments of the Leaderway-V450 CNC machine tool in different periods of the year, the principal component regression (PCR) modelling algorithm, which can eliminate the collinearity effect, is proposed to establish the thermal error compensation model of the machine tool on the basis of selecting the temperature-sensitive points by using the correlation coefficient. It is compared with the newly proposed ridge regression thermal error compensation modelling algorithm. The results show that the thermal error compensation modelling method proposed in this paper can basically control the Z-direction thermal error of the CNC machine tool spindle within 10 μm with only two temperature sensors and has higher engineering practicability. It is found that the thermal error compensation model of machine tools has a jump interval affected by the ambient temperature. This interval is called the temperature-sensitive interval, and a temperature-sensitive interval subsection point selection algorithm is proposed to build a subsection model on both sides of the segment point. The results show that the Z-direction thermal error of the spindle of CNC machine tools can be basically controlled within 5 μm with only two temperature sensors and that the model is highly robust and has great engineering application value.

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Acknowledgements

This work is supported by the Key Project of the National Natural Science Foundation of China (No. 51490660/51490661) and the Scientific Research Foundation of Chongqing University of Technology.

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Authors and Affiliations

  1. College of Mechanical Engineering, Chongqing University of Technology, Chongqing, 400054, China

    Yunsheng Liu, Enming Miao & Yangyang Chen

  2. School of Automation, Xian University of Posts & Telecommunications, Xian, 710121, China

    Hui Liu

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  1. Yunsheng Liu
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  2. Enming Miao
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  3. Hui Liu
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  4. Yangyang Chen
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Correspondence to Enming Miao.

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Liu, Y., Miao, E., Liu, H. et al. Robust machine tool thermal error compensation modelling based on temperature-sensitive interval segmentation modelling technology. Int J Adv Manuf Technol 106, 655–669 (2020). https://doi.org/10.1007/s00170-019-04482-8

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