Dr. Hongyu Li Profile

Dr. Hongyu Li

Research Fellow at University of Huddersfield

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Author

Publications (10)

Proceedings Article | 10 July 2018 Presentation + Paper

A novel hyper-crossing tool path generation algorithm for sub-aperture polishing

Christina Reynolds, David Walker, Guoyu Yu, Hongyu Li

Proceedings Volume 10706, 107060F (2018) https://doi.org/10.1117/12.2312827

KEYWORDS: Polishing, Surface finishing, Algorithm development, Robotics, Optimization (mathematics), Precision optics, Mirrors, Aspheric lenses, Process control

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Proceedings Article | 15 June 2018 Paper

Advanced techniques for robotic polishing of aluminum mirrors

Hongyu Li, David Walker, Xiao Zheng, Guoyu Yu, Christina Reynolds, Wang Zhang, Tony Li

Proceedings Volume 10692, 106920N (2018) https://doi.org/10.1117/12.2311625

KEYWORDS: Polishing, Surface finishing, Aluminum, Mirrors, Robots, Aspheric lenses, Robotics, Single point diamond turning, Glasses

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Proceedings Article | 15 June 2017 Paper

More steps towards process automation for optical fabrication

David Walker, Guoyu Yu, Anthony Beaucamp, Matt Bibby, Hongyu Li, Lee McCluskey, Sanja Petrovic, Christina Reynolds

Proceedings Volume 10326, 103260S (2017) https://doi.org/10.1117/12.2275231

KEYWORDS: Optical fabrication, Artificial intelligence, Metrology, Robots, Manufacturing, Optics manufacturing, Data processing, Data modeling, Polishing, Head

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Proceedings Article | 22 July 2016 Paper

Optimisation of grolishing freeform surfaces with rigid and semi-rigid tools

Guoyu Yu, Hsing-Yu Wu, David Walker, Xiao Zheng, Hongyu Li, Christina Dunn, Caroline Gray

Proceedings Volume 9912, 99123Q (2016) https://doi.org/10.1117/12.2232657

KEYWORDS: Mirrors, Aspheric lenses, Abrasives, Polishing, Aspheric lenses, Metrology, Surface finishing, Glasses, Spindles, Photovoltaics, Robots

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Proceedings Article | 30 June 2016 Paper

Closing the metrology/process loop in CNC polishing

David Walker, Guoyu Yu, Matt Bibby, Hongyu Li, Christina Dunn

Proceedings Volume 10009, 100090O (2016) https://doi.org/10.1117/12.2235530

KEYWORDS: Metrology, Manufacturing, Polishing, Polishing equipment, Optical alignment, Robots, Interferometers, Surface finishing, Interferometry, Precision optics

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Proceedings Article | 27 August 2015 Paper

The role of robotics in computer controlled polishing of large and small optics

David Walker, Christina Dunn, Guoyu Yu, Matt Bibby, Xiao Zheng, Hsing Yu Wu, Hongyu Li, Chunlian Lu

Proceedings Volume 9575, 95750B (2015) https://doi.org/10.1117/12.2189203

KEYWORDS: Robots, Spindles, Optics manufacturing, Polishing, Abrasives, Surface finishing, Metrology, Robotics, Prototyping, Diamond

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Proceedings Article | 2 September 2014 Paper

Active edge control in the precessions polishing process for manufacturing large mirror segments

Hongyu Li, Wei Zhang, David Walker, Gouyo Yu

Proceedings Volume 9280, 928007 (2014) https://doi.org/10.1117/12.2069790

KEYWORDS: Polishing, Surface finishing, Finite element methods, Mirrors, Telescopes, Control systems, Manufacturing, Photovoltaics, Zerodur, Segmented mirrors

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Proceedings Article | 16 October 2012 Paper

Research on fabrication of mirror segments for E-ELT

Guoyu Yu, David Walker, Hongyu Li

Proceedings Volume 8416, 841602 (2012) https://doi.org/10.1117/12.2009290

KEYWORDS: Polishing, Surface finishing, Mirrors, Spatial frequencies, Photovoltaics, Metrology, Aspheric lenses, Abrasives, Interferometry, Optics manufacturing

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The next generation ground-based giant telescope, the European Extremely Large Telescope (E-ELT), under development by the European Southern Observation (ESO) ¹, will have nearly 1000 hexagonal segments of 1.45m across the flats. Fast processing of these segments with high form and edge specifications has proven to be a challenge. The Zeeko Precessions sub-aperture bonnet polishing plays an important role providing capability for polishing the surface and correcting the form to meet this target ^2,3. BoX^TM grinding has been adopted. This technology has the advantage of fast generating of aspheric surface with very low subsurface damage (SSD) ⁴. This will avoid the need of removing thick layer of stock at polishing stage to remove SSD. However the result grinding signatures has proven to be problematic for direct polishing with Zeeko’s standard bonnet technology. A novel ‘grolishing’ process which stands between ‘grinding’ and ‘polishing’ has been developed to deal with mid-spatial features left by BoX^TM grinding. This tool is designed base on Zeeko’s R80 bonnet which will fits directly into the company’s IRP series machines. The process parameters have been optimised to have signatures less than 10 nm PV. The edge profile is 1μm upstand within 40 mm edge zone. The ‘grolished’ surface can be directly pre-polished together with all the form corrections. To meet the fabrication time target, R160 bonnet is used with 50 mm polishing spot, this will provide removal rate of 9.8 mm³/minute, which can be employed at pre-polishing stage and some form correction. Process parameters have been developed to leave slow upstand at edge zone without any form of sharp edge downturn. The following form correction stage, which employs smaller polishing spot of about 20 mm diameter, will continue to remove form errors of spatial frequency between 0.02 – 0.05 1/mm. Furthermore, the upstand edge will be, to a large part, removed at this stage. It is demonstrated that the form specs can be achieved after this process. The following smoothing process will improve surface textures and remove edge errors. Local edge rectification is normally necessary to bring the edge at same level. A final smoothing process will bring the bulk area and edge zone to meet all the specifications.

Proceedings Article | 16 October 2012 Paper

Polishing large-aperture mirror using ultraprecise Bonnet and PSD result analysis

Wei Wang, Min Xu, Hongyu Li, Guoyu Yu

Proceedings Volume 8416, 84160P (2012) https://doi.org/10.1117/12.977788

KEYWORDS: Polishing, Optics manufacturing, Surface finishing, Optical components, Mirrors, National Ignition Facility, Spatial frequencies, Aerospace engineering, Aspheric lenses, Optics

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Proceedings Article | 13 September 2012 Paper

Edge-control and surface-smoothness in sub-aperture polishing of mirror segments

D. Walker, A. Beaucamp, R. Evans, T. Fox-Leonard, N. Fairhurst, C. Gray, S. Hamidi, H. Li, W. Messelink, J. Mitchell, P. Rees, G. Yu

Proceedings Volume 8450, 84502A (2012) https://doi.org/10.1117/12.926183

KEYWORDS: Polishing, Aspheric lenses, Surface finishing, Mirrors, Telescopes, Spherical lenses, Space telescopes, Spatial frequencies, Prototyping, Optics manufacturing

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Showing 5 of 10 publications

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