Prof. Deping Yu Profile

Prof. Deping Yu

at Sichuan University

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Author

Publications (3)

Proceedings Article | 16 January 2019 Paper

Application of pressure regulation in CCOS polishing technology

Fengfei Ye, Yongjian Wan, Deping Yu, Haitao Liu

Proceedings Volume 10838, 108380F (2019) https://doi.org/10.1117/12.2504877

KEYWORDS: Polishing, Surface finishing, Head, Iron, Photovoltaics, Mathematical modeling, Error analysis, Optics manufacturing, Mirrors, Control systems

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In grinding and polishing of the aspherical and freeform surface, the CCOS technology is widely used. It is a process during which errors can be corrected quantificationally by a small tool that can follow the local curves of the aspherical and freeform surface. It commonly uses constant pressure during polishing, and thus the desired amount of material to be remove depends on the dwell time. This thesis the pressure regulation is introduced into the CCOS polishing system. The pressure can be controlled in real time in the process of processing, and the application of pressure control in CCOS polishing is realized. The main characteristic of this technology is that the desired amount of material to be removed is controlled by both the polishing pressure and the dwell time. Firstly, a mathematical model was established for the variable pressure polishing process. Then the machining efficiency and the influence of pressure error on machining quality are simulated and analyzed. Finally, a material removal experiment that applied sinusoidal pressure was carried out on a K9 material mirror. Results showed that frequency of the measured pressure is the same as that of the ideal sinusoidal polishing pressure. The spatial period of the measured surface profile is the same as that of surface profile obtained by simulation of the sinusoidal polishing process. The surface profile error is within 17%. In this thesis, variable pressure polishing was achieved. Compared with the constant pressure CCOS polishing technology, the variable pressure CCOS polishing technology adds one more degree of freedom to the polishing process. It need have higher requirements for the pressure active control system, such as the output pressure range, response speed and precision. These performance parameters can affect the processing results. Therefore the key to developing the variable pressure CCOS polishing technology is to research the polishing tool, which must have high performance pressure active control system.

Proceedings Article | 16 January 2019 Paper

A predictive model of critical depth of cut for ultrasonic elliptical vibration cutting of brittle materials

Weihai Huang, Deping Yu, Xinquan Zhang, Min Zhang, Dongsheng Chen

Proceedings Volume 10838, 108380B (2019) https://doi.org/10.1117/12.2504846

KEYWORDS: Crystals, Ultrasonics, Diamond machining, Manufacturing, Diamond turning, Microscopes, Laser crystals, Surface finishing, Diamond, Semiconductor lasers

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Proceedings Article | 28 October 2016 Paper

Investigation of variable spindle speed in slow tool servo-based turning of noncircular optical components

Weihai Huang, Deping Yu, Dongsheng Chen, Min Zhang, Jinguang Liu, Jin Yao

Proceedings Volume 9683, 968304 (2016) https://doi.org/10.1117/12.2242183

KEYWORDS: Spindles, Optical components, Servomechanisms, Diamond turning, Optics manufacturing, Spectroscopy, Fourier transforms, Lithium, Manufacturing, Diamond machining

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