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Ultra-precision milling and grinding for large-sagittal MgF2 aspheric optical elements

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Abstract

Ultra-precision machining for large-sagittal aspheric optical elements has become one of the research hotspots in the world’s processing and manufacturing field in recent years. This paper mainly studies the processing of large-sagittal MgF2 aspheric optical components, analyzes the grinding tracks of two different grinding methods, and seeks the best grinding method. Experimental research was carried out on three milling modes in the rigid grinding process. In the processing method of pressed milling, the rotational speed of the workpiece has the most significant effect on the surface roughness. The surface roughness Ra can be reduced by reducing the grain size of the grinding wheel and adjusting the processing parameters. Through the cylindrical milling method, the surface roughness Ra measured with the D46 grinding wheel in the direction of rotation can reach the minimum, which is 0.7–0.8 μm. In the fine grinding stage, the circumferential grinding and endface grinding models are established, and the simulation analysis and experimental verification of the trajectory of the abrasive particles in the two grinding methods are carried out. The comparison shows that with endface grinding, the surface of the component is removed evenly in both directions. When the grain size is 28 μm, the surface roughness Ra∥ and Ra⊥ of face grinding are the smallest. Among them, Ra∥ is 0.0458 μm, and Ra⊥ is 0.0369 μm. This study is of great significance in improving the machining efficiency and accuracy of large-sagittal aspheric optical elements.

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Authors and Affiliations

  1. Laser Fusion Research Center, China Academy of Engineering Physics, Mianyang, 621900, China

    Qiancai Wei, Fei Fan, Bo Zhong, Lian Zhou, Nan Zheng & Houcai Ma

  2. Department of Mechanical and Electrical Engineering, Xiamen University, Xiamen, 361005, China

    Pengli Lei & Zhenzhong Wang

  3. Tianjin Jinhang Institute of Technical Physics, Tianjin, 300308, China

    Hao Zhang

Authors
  1. Qiancai Wei
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  2. Pengli Lei
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  3. Fei Fan
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  4. Bo Zhong
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  5. Lian Zhou
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  6. Zhenzhong Wang
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  7. Nan Zheng
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  8. Houcai Ma
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  9. Hao Zhang
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Contributions

Qiancai Wei conceived the experiments and prepared the manuscript. Pengli Lei helped to analyze the data. Fei Fan and Bo Zhong were responsible for the theoretical modeling analysis. Lian Zhou, Nan Zheng, and Houcai Ma assisted in all the experiments. Zhenzhong Wang and Hao Zhang were responsible for the formulation of the overall plan.

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Correspondence to Hao Zhang.

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Wei, Q., Lei, P., Fan, F. et al. Ultra-precision milling and grinding for large-sagittal MgF2 aspheric optical elements. Int J Adv Manuf Technol 131, 2985–3004 (2024). https://doi.org/10.1007/s00170-023-12861-5

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  • DOI: https://doi.org/10.1007/s00170-023-12861-5

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