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Study on active lap tool influence function in grinding 1.8 m primary mirror.

Liu Haitao, Zeng Zhige, Wu Fan

    Applied Optics
    |November 13, 2013
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    Summary

    This study introduces a theoretical model for predicting the ring tool influence function (TIF) in computer-controlled lap grinding. The method improves primary mirror surface accuracy, reducing errors significantly.

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    Area of Science:

    • Optics and Photonics
    • Manufacturing Engineering
    • Computational Modeling

    Background:

    • Accurate surface generation is critical for large optical components.
    • Traditional lap grinding methods face challenges in precision and efficiency for large primary mirrors.
    • Understanding the tool influence function (TIF) is essential for predictive modeling in abrasive processes.

    Purpose of the Study:

    • To develop a theoretical model for predicting the ring tool influence function (TIF) in computer-controlled active lap processes.
    • To analyze the impact of the lap-grinding layer gap on the ring TIF.
    • To investigate the relationship between TIF shape and lap-workpiece rotation speed ratio for optimizing fabrication.

    Main Methods:

    • Theoretical modeling of the ring tool influence function (TIF).
    • Analysis of the lap-grinding layer gap's effect on TIF.
    • Investigation of lap-workpiece rotation speed ratio influence on TIF.
    • Development of a dwell time calculation recipe for axisymmetric fabrication.

    Main Results:

    • A predictive model for ring TIF was established.
    • The influence of the lap-grinding layer gap on TIF was quantified.
    • The relationship between TIF shape and rotation speed ratio was elucidated.
    • The grinding process for a 1.8 m primary mirror was optimized.

    Conclusions:

    • The developed theoretical model accurately predicts ring TIF.
    • Optimized grinding parameters significantly reduced surface shape error on a large primary mirror.
    • The method enhances precision and efficiency in large optical component fabrication.