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Profile error compensation in cross-grinding mode for large-diameter aspheric mirrors

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Abstract

This study proposes a high-precision compensation system using an on-machine noncontact measuring system to improve the manufacturing accuracy and efficiency of large-diameter aspheric mirrors by reducing profile errors arising from tool setting errors and machine positioning errors. By measuring a standard hemisphere, the assembly tilt angle of the measurement sensor can be calibrated. The grinding wheel setting offset can be calculated by comparing the measured profile and the ideal profile, and the profile error caused by wheel offset can be reduced by adjusting the grinding origin coordinate. According to the normal unit vector and residual error in the Z direction of the measuring points, the normal residual errors corresponding to the grinding points could be generated as well as the compensation grinding numerical control (NC) program. An 800-mm-diameter K9 mirror was ground to verify the proposed compensation grinding method. The profile error was reduced from 65 to 35 μm during the semi-finish grinding stage. By using the compensation grinding path, the profile accuracy was improved from 35 to 8 μm in the fine grinding stage. The proposed compensation method effectively improves the profile accuracy and manufacturing efficiency for grinding large-diameter aspheric mirrors.

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Authors and Affiliations

  1. Xi’an Jiaotong University, Xi’an, Shannxi, China

    J. P. Xi, H. Y. Zhao, B. Li & D. X. Ren

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  1. J. P. Xi
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  2. H. Y. Zhao
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  3. B. Li
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  4. D. X. Ren
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Correspondence to J. P. Xi.

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Xi, J.P., Zhao, H.Y., Li, B. et al. Profile error compensation in cross-grinding mode for large-diameter aspheric mirrors. Int J Adv Manuf Technol 83, 1515–1523 (2016). https://doi.org/10.1007/s00170-015-7689-7

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  • DOI: https://doi.org/10.1007/s00170-015-7689-7

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