A novel ductile machining model of single-crystal silicon for freeform surfaces with large azimuthal height variation by ultra-precision fly cutting
Sign Up to like & getrecommendations! Published in 2018 at "International Journal of Machine Tools and Manufacture"
DOI: 10.1016/j.ijmachtools.2018.07.005
Abstract: Abstract Ultra-precision fly cutting (UPFC) is an important technology in the fabrication of freeform surfaces on single-crystal silicon. However, the insufficient understanding of the ductile machining mechanisms in UPFC of silicon under a large depth… read more here.
Keywords: freeform surfaces; machining model; ductile machining; silicon ... See more keywords
Machining of Micro Grayscale Images on Freeform Surfaces by Vibration-assisted Cutting
Sign Up to like & getrecommendations! Published in 2020 at "Journal of Manufacturing Processes"
DOI: 10.1016/j.jmapro.2020.08.051
Abstract: Abstract In this paper, a new vibration-assisted cutting method is proposed to machine micro grayscale images onto metal freeform surfaces. Taking advantage of a non-resonant vibration complaint cutting device used in a machining system, two… read more here.
Keywords: micro grayscale; vibration; freeform surfaces; assisted cutting ... See more keywords
A smooth tool path generation method for ultraprecision turning discontinuous multi-freeform-surfaces with high machining efficiency
Sign Up to like & getrecommendations! Published in 2021 at "Journal of Materials Processing Technology"
DOI: 10.1016/j.jmatprotec.2021.117280
Abstract: Abstract The typical tool path of turning freeform surfaces is spiral. Usually, this kind of tool path only can deal with continuous surfaces within a circular area. If the designed surfaces are not continuous, the… read more here.
Keywords: method; freeform surfaces; path; smooth tool ... See more keywords
Ultra-precision turning method efficient for optical freeform surfaces with a hybrid slow-fast tool servo.
Sign Up to like & getrecommendations! Published in 2022 at "Applied optics"
DOI: 10.1364/ao.448009
Abstract: The machining of freeform surfaces is a current research hotspot: A slow tool servo (STS) has limitations in machining accuracy and efficiency for large steep freeform surfaces. Most fast tool servo (FTS) tools are limited… read more here.
Keywords: tool servo; fast tool; freeform surfaces; freeform ... See more keywords
Modeling of surface topography on diamond-turned spherical and freeform surfaces.
Sign Up to like & getrecommendations! Published in 2017 at "Applied optics"
DOI: 10.1364/ao.56.004466
Abstract: Single-point diamond turning machines are capable of generating high-quality spherical and freeform surfaces. However, there are inevitable tool marks on the diamond-turned surfaces. Although several models have been proposed to describe the surface topography of… read more here.
Keywords: topography; spherical freeform; freeform surfaces; diamond ... See more keywords
Point-by-point design method for mixed-surface-type off-axis reflective imaging systems with spherical, aspheric, and freeform surfaces.
Sign Up to like & getrecommendations! Published in 2017 at "Optics express"
DOI: 10.1364/oe.25.010663
Abstract: In this paper, mixed-surface-type optical system is defined as the optical system comprised of various types of surfaces, including spherical, aspheric, and freeform surfaces. A general point-by-point design method for mixed-surface-type systems is proposed. In… read more here.
Keywords: surface; mixed surface; freeform surfaces; point ... See more keywords
Model-based self-optimization method for form correction in the computer controlled bonnet polishing of optical freeform surfaces.
Sign Up to like & getrecommendations! Published in 2018 at "Optics express"
DOI: 10.1364/oe.26.002065
Abstract: Freeform surfaces have become increasingly widespread in the optical systems for enhanced performance and compact lightweight packaging. The geometrical complexity and high precision requirements of optical freeform surfaces for various functional optical applications, has posed… read more here.
Keywords: model based; self optimization; based self; freeform ... See more keywords
Double freeform surfaces design for beam shaping with non-planar wavefront using an integrable ray mapping method.
Sign Up to like & getrecommendations! Published in 2019 at "Optics express"
DOI: 10.1364/oe.27.026757
Abstract: We propose a method to design double smooth freeform surfaces applied in beam shaping with a ray mapping method in the paper. We couple the calculation of ray mapping and the construction of freeform surfaces… read more here.
Keywords: ray mapping; design; method; freeform surfaces ... See more keywords
Null screens to evaluate the shape of freeform surfaces: progressive addition lenses.
Sign Up to like & getrecommendations! Published in 2021 at "Optics express"
DOI: 10.1364/oe.434289
Abstract: We propose a method for measuring the shape of freeform surfaces such as Progressive Addition Lenses (PAL). It is based on optical deflectometry by considering a non-uniform pattern of spots computed by using the null-screen… read more here.
Keywords: freeform; progressive addition; freeform surfaces; shape freeform ... See more keywords
Analytical design method for small-sag freeform surfaces in optical systems with rectangular fields of view.
Sign Up to like & getrecommendations! Published in 2025 at "Optics express"
DOI: 10.1364/oe.569033
Abstract: In optical systems with multiple freeform surfaces, overcompensation between freeform surfaces can occur during optimization. This paper proposes an analytical method for the calculation of freeform surface parameters based on rectangular Zernike orthogonal polynomials. We… read more here.
Keywords: method; freeform surfaces; freeform surface; surface ... See more keywords
Sag- and slope-orthogonal bases to characterise nominally rectangular freeform surfaces.
Sign Up to like & getrecommendations! Published in 2025 at "Optics express"
DOI: 10.1364/oe.576197
Abstract: Sag- or slope-orthogonal bases have proven effective for characterising aspheric and freeform surfaces on circular apertures. Things are not so straightforward, however, for rectangular apertures when slope orthogonality is desired. While such a basis can… read more here.
Keywords: freeform surfaces; slope orthogonal; sag slope; bases characterise ... See more keywords