Insight into aspheric misfit with hard tools: mapping the island of low mid-spatial frequencies

Walker David; Hsing-Yu Wu; Yu Guoyu; Li Hongyu; Zhang Wang; Lu Chunlian

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Insight into aspheric misfit with hard tools: mapping the island of low mid-spatial frequencies

机译：用硬工具洞察非球面的耗材：映射低中间空间频率的岛屿

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This paper addresses computer numerical control (CNC) polishing of aspheric or freeform optics. Prior CNC grinding of the asphere tends to produce mid-spatial frequencies (MSFs) at some level. Precessions polishing can rectify these, but the very ability of the bonnet tooling to adapt to the local asphere enables it to do so, at least in part, to similar spatial frequencies in the MSFs. To accelerate smoothing, hard tools can, in principle, be used, but aspheric misfit is often assumed to preclude this. In this paper, we explore new insight into the role of abrasive particle size in accommodating misfit. First, we report on a glass-bending rig to produce a continuous range of complex surfaces, while withstanding process forces. Then, we describe how this was used to evaluate the triangle of misfit, abrasive size, and MSFs produced for hard rotating tools. This has revealed a regime in which such tools can be used without introducing significant new MSFs, as evidenced by manufacture of prototype off-axis aspheric segments for the European Extremely Large Telescope project.

机译：本文解决了非球面或自由形态光学器件的计算机数控（CNC）抛光。在某种程度上倾向于在某种程度上产生中间数控磨削倾向于产生中间空间频率（MSF）。 Precessions Polishing可以纠正这些，但是发动机罩工具适应本地购物中心的能力使其至少部分地执行MSF中的类似空间频率。为了加速平滑，原则上可以使用硬工具，但是常常认为非球面的错误排除才能排除这一点。在本文中，我们探讨了磨粒粒度在适应误操作中的作用的新洞察力。首先，我们在玻璃弯曲台上报道，以产生连续的复杂表面，而具有耐受处理力。然后，我们描述了如何用于评估用于硬旋转工具所生产的错入，磨料尺寸和MSF的三角形。这揭示了一种制度，其中可以使用这种工具而不引入显着的新MSF，如欧洲极大的望远镜项目的原型非轴非球面段的制造所证明。

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来源
《Applied optics》 |2017年第36期|共7页
作者
Walker David; Hsing-Yu Wu; Yu Guoyu; Li Hongyu; Zhang Wang; Lu Chunlian;
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Univ Huddersfield Natl Facil Ultra Precis Surfaces OpT Ctr St Asaph LL17 0JD N Wales Wales;

UCL Dept Phys &

Astron Gower St London WC1E 6BT England;

Univ Huddersfield Natl Facil Ultra Precis Surfaces OpT Ctr St Asaph LL17 0JD N Wales Wales;

Univ Huddersfield Natl Facil Ultra Precis Surfaces OpT Ctr St Asaph LL17 0JD N Wales Wales;

UCL Dept Phys &

Astron Gower St London WC1E 6BT England;

Univ Huddersfield Natl Facil Ultra Precis Surfaces OpT Ctr St Asaph LL17 0JD N Wales Wales;

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Insight into aspheric misfit with hard tools: mapping the island of low mid-spatial frequencies

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