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基于快速刀具伺服系统的自由曲面补偿加工。

Compensation machining of freeform based on fast tool servo system.

机构信息

National University of Defense Technology, Changsha, 410000, China.

出版信息

PLoS One. 2023 Mar 16;18(3):e0282752. doi: 10.1371/journal.pone.0282752. eCollection 2023.

DOI:10.1371/journal.pone.0282752
PMID:36928214
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10019709/
Abstract

With the advantages of large field of view, low cost and simple structure, the freeform optical system has extensive requirements in space exploration and other fields. However, the current machining methods for freeform are difficult to meet the requirements of optical use. Based on a developed fast servo tool (FTS) device, this paper proposes an error compensation turning method for freeforms. Firstly, the Zernike polynomial fitting method is used to reconstruct the freeform surface shape error obtained from off-line measurement, and the offset compensation is used to correct the tool path. Then, the compensation processing physical system is built to simulate the off-line compensation processing of the workpiece to verify the feasibility of compensation processing. Finally, the turning compensation processing of convex freeform aluminum mirror is carried out, and the surface accuracy of the workpiece meets the requirements of visible band. The research results have important practical significance for realizing the fast response machining of free-form surface mirror.

摘要

自由曲面光学系统具有视场大、成本低、结构简单等优点，在空间探测等领域有广泛的需求。然而，目前的自由曲面加工方法难以满足光学使用的要求。基于开发的快速伺服刀具（FTS）装置，本文提出了一种自由曲面的误差补偿车削方法。首先，采用 Zernike 多项式拟合方法对离线测量得到的自由曲面形状误差进行重构，并采用偏置补偿对刀具路径进行修正。然后，建立补偿加工物理系统，模拟对工件的离线补偿加工，验证补偿加工的可行性。最后，对凸面自由曲面铝反射镜进行车削补偿加工，加工后的工件表面精度满足可见光波段的要求。该研究结果对实现自由曲面反射镜的快速响应加工具有重要的实际意义。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6639/10019709/4cecfef833ab/pone.0282752.g015.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6639/10019709/4cecfef833ab/pone.0282752.g015.jpg

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本文引用的文献

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Fabrication and evaluation of complicated microstructures on cylindrical surface.在圆柱面上制造和评估复杂的微结构。
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Opt Express. 2012 Jan 30;20(3):2483-99. doi: 10.1364/OE.20.002483.