Optics and Precision Engineering, Volume. 32, Issue 5, 704(2024)

Five-axis CNC machining method for eyeglass lens edge profile

Hongtao LI1... Huazhong XIANG1,*, Zexi ZHENG2, Qihui DING1, Xin ZHANG1, Peng WANG1, Dawei ZHANG3 and Songlin ZHUANG3 |Show fewer author(s)
Author Affiliations
  • 1School of Health Science and Engineering, University of Shanghai for Science and Technology,Shanghai200093,China
  • 2School of Mechanical Engineering, University of Shanghai for Science and Technology, Shanghai00093,China
  • 3School of Optical-Eletrical and Computer Engineering,University of Shanghai for Science and Technology, Shanghai20009,China
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    To enhance the eyeglass lens manufacturing process and mitigate issues stemming from abrupt changes in tool axis vectors during lens edge processing, which could degrade surface quality, this study introduces a five-axis numerical control machining path strategy using UG NX (Unigraphics NX). Initially, an intelligent frame scanner captures the eyeglass frame edges, generating point cloud data of the notches. A program is then crafted to convert the spherical coordinate data from OMA files, adhering to eyeglass lens processing standards, into the required coordinates and formats. Furthermore, employing the NURBS curve fitting algorithm enables continuous tool path trajectories, ensuring curve fitting accuracy. The NC (numerical control) machine tool, fitted with a specialized conical milling cutter for lens edge processing, thus improves the precision and efficiency of lens production. In addition, a technique is developed to ensure the tool axis vector changes smoothly, utilizing curve-driven tool axis motion and normal vector constraints of the lens surface for steady tool feeding. The tool path file undergoes post-processing to be converted into NC code. Upon manufacturing, lens error measurement reveals that the proposed method, focusing on curve fitting and tool axis control, significantly enhances machining surface accuracy and smoothness, reduces the manufacturing timeline, and boosts machining efficiency.

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    Hongtao LI, Huazhong XIANG, Zexi ZHENG, Qihui DING, Xin ZHANG, Peng WANG, Dawei ZHANG, Songlin ZHUANG. Five-axis CNC machining method for eyeglass lens edge profile[J]. Optics and Precision Engineering, 2024, 32(5): 704

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    Paper Information

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    Received: Aug. 22, 2023

    Accepted: --

    Published Online: Apr. 2, 2024

    The Author Email:

    DOI:10.37188/OPE.20243205.0704

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