Deterministic manufacturing processes for precision optical surfaces

Pollicove, Harvey M.; Fess, Edward; Schoen, John M.

doi:10.1117/12.487105

Cited by 33 publications

(22 citation statements)

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“…25,26 It requires precise computer numerical control (CNC) to operate the polishing tool, the size of which is small compared to the size of the workpiece surface (sub-aperture polishing tool). 27,28 This allows material to be removed in small, controlled locations from the workpiece surface 4 and thus facilitates error dependent polishing.…”

Section: Computer-controlled Polishingmentioning

confidence: 99%

“…An electromagnet mounted below the wheel causes the fluid to stiffen 49 and adhere to the wheel surface, where it attains the peripheral velocity of the wheel. 25 The fluid circuit consists of two pumps, a nozzle, a suction cup, a fluid conditioner and the wheel itself. 35,45,50 The fluid conditioner ensures stable fluid properties eoeiq,how quo noiioue x jinu pninoiiieoq qmuq and thus a constant influence function, which is required by the dwell time method.…”

Section: Magnetorheological Finishingmentioning

confidence: 99%

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Advanced techniques for computer-controlled polishing

et al. 2008

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Computer-controlled polishing has introduced determinism into the finishing of high-quality surfaces, for example those used as optical interfaces. Computer-controlled polishing may overcome many of the disadvantages of traditional polishing techniques. The polishing procedure is computed in terms of the surface error-profile and the material removal characteristic of the polishing tool, the influence function. Determinism and predictability not only enable more economical manufacture but also facilitate considerably increased processing accuracy. However, there are several disadvantages that serve to limit the capabilities of computer-controlled polishing, many of these are considered to be issues associated with determination of the influence function. Magnetorheological finishing has been investigated and various new techniques and approaches that dramatically enhance the potential as well as the economics of computer-controlled polishing have been developed and verified experimentally. Recent developments and advancements in computer-controlled polishing are discussed. The generic results of this research may be used in a wide variety of alternative applications in which controlled material removal is employed to achieve a desired surface specification, ranging from surface treatment processes in technical disciplines, to manipulation of biological surface textures in medical technologies.

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Section: Computer-controlled Polishingmentioning

confidence: 99%

Section: Magnetorheological Finishingmentioning

confidence: 99%

Advanced techniques for computer-controlled polishing

et al. 2008

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“…The other shortcoming is that the work piece has to be pre-polished. 1,2,3,4,5,6 This article studies Magnetorheological finishing technology based on "surface contact", 7 that is, work pieces are polished by the ring-like polishing tools formed by the MR fluid under the magnetic field. Compared with "point-contact", this technology has the higher processing efficiency.…”

Section: Introductionmentioning

confidence: 99%

Research on polishing technology based on surface contact MRF

Chen

Guo

Liu

et al. 2007

3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technolo

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A novel polishing technology based on surface-contact MRF is introduced. The principle, the magnetic field structure and the mode of motion of this polishing method are described. Through development of uniform ring-like magnetic field, the relevant mechanical device and circulatory system-delivered MRF from the magnetic field center are designed. By using the orthogonal experimental technique on this system, the polishing experiment for the plane K9 glass of Ф 60 is carried out. The experiment result is examined on a Non-contact interferometer Taylor Surf CCI2000. It analyzed the influence of surface roughness and material elimination quantity under the velocity of the principle axis, the intensity of the magnetic field, the velocity of even pendulum of the magnetic pole, the distance between the work-piece and the pole. The diagrams of surface roughness and material elimination quantity under the above craft parameter are given. And the best craft parameter combination is obtained. It is showed by research and experiment that the roughness of the experimental work piece can decrease to Ra 0.86nm from Ra 284.1nm in 50 min under the craft parameter. The intensity of magnetic field 1800G, the velocity of the principle axis 490 rpm, the velocity of even pendulum of the magnetic pole 8rpm, the distance between the work-piece and the pole 1mm are all described.

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“…Computer controlled polishing (CCP) is a high-precision finishing technique for high-quality surfaces, for example high-quality lenses in the field of optics [1][2][3]. CCP is characterised by the calculation of surface error-profile dependent polishing sequences prior to processing [4].…”

Section: Introductionmentioning

confidence: 99%