&lt;title&gt;Development of optimal grinding and polishing tools for aspheric surfaces&lt;/title&gt;

Burge, James H.; Anderson, Bill; Benjamin, Scott D; Cho, Myung K.; Smith, Koby; Valente, M.

doi:10.1117/12.453615

Cited by 21 publications

(23 citation statements)

References 5 publications

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“…The linear trend was fitted with the experimental data (ɛ 0 , Δɛ, and ΔZ) to obtain the slope of the SF function, i.e., k. Hence, κ total could be calculated from (6).…”

Section: Smoothing Experiments and Resultsmentioning

confidence: 99%

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Improving smoothing efficiency of rigid conformal polishing tool using time-dependent smoothing evaluation model

Song

Zhang

et al. 2017

Photonic Sens

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Abstract:A rigid conformal (RC) lap can smooth mid-spatial-frequency (MSF) errors, which are naturally smaller than the tool size, while still removing large-scale errors in a short time. However, the RC-lap smoothing efficiency performance is poorer than expected, and existing smoothing models cannot explicitly specify the methods to improve this efficiency. We presented an explicit time-dependent smoothing evaluation model that contained specific smoothing parameters directly derived from the parametric smoothing model and the Preston equation. Based on the time-dependent model, we proposed a strategy to improve the RC-lap smoothing efficiency, which incorporated the theoretical model, tool optimization, and efficiency limit determination. Two sets of smoothing experiments were performed to demonstrate the smoothing efficiency achieved using the time-dependent smoothing model. A high, theory-like tool influence function and a limiting tool speed of 300 RPM were obtained.

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“…The linear trend was fitted with the experimental data (ɛ 0 , Δɛ, and ΔZ) to obtain the slope of the SF function, i.e., k. Hence, κ total could be calculated from (6).…”

Section: Smoothing Experiments and Resultsmentioning

confidence: 99%

“…Compared with active stress laps [5] and semi-flexible tools [6], an RC lap provides numerous advantages, such as ease of large-scale manufacture, superior surface roughness, and a highly stable theory-like tool influence function (TIF). However, the RC-lap smoothing efficiency performance is poorer than expected [7].…”

Section: Introductionmentioning

confidence: 99%

Improving smoothing efficiency of rigid conformal polishing tool using time-dependent smoothing evaluation model

Song

Zhang

et al. 2017

Photonic Sens

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“…However, there is a wildly recognized challenge in this technology, i.e., the instability of TIF, which causes by some factors, such as the distortion of tool surface, the variety of tool rigidity. In CCOS, the unstable TIF will lead to the uncertainty in the material removal, and reduce the fabricating precision and efficiency of optical components [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Impact of pad material on stability of tool influnce function in CCOS

Zhong¹,

Chen²,

Li³

2017

Proceedings of the 2017 6th International Conference on Measurement, Instrumentation and Automation (ICMIA 2017)

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Abstract. The stability of tool influnce function (TIF) is the key to achieve deterministic removal in the computer controlled optical surfacing (CCOS). In this paper, the comparative experiment was conducted to investigate the impact of two common pad materials (i.e., cloth, pitch) on the TIF. In addition, by assistant of the dynamometer, the polishing force of the TIF was detected to reveal the reason of the instability of TIFs. The results show that: 1) the stability of cloth tool is better than that of pitch tool, and the stability of TIFs peak removal efficiency with cloth and pitch are 93.5% and 76%, respectively. 2) the stability of TIFs are directly influenced by the frictional force, which indirectly reflects the stability of the contact state of the workpiece and polishing tool. The research of this paper also provides an important foundation for the further study of improving material removal stability based on the optimization of pad material.

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“…8 However, when a rotating (and so rotationally-symmetric) rigid tool moves across an asphere, there is a varying misfit. In the general case of an off-axis asphere (or freeform), where a rotating rigid tool follows a pre-determined tool-path, three types of misfit are defined as: Misfit-1: Misfit of the rotationally-symmetric rigid tool to the surface Misfit-2: Misfit due to the change in surface asphericity along one tool-path trajectory.…”

Section: Principle Of Misfit 41 Definition Of Misfitmentioning

confidence: 99%

Misfit of rigid tools and interferometer subapertures on off-axis aspheric mirror segments

Song

Walker

2011

Opt. Eng

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Abstract. Rigid tools can confer advantages at certain stages of manufacturing off-axis mirror segments, but the misfit due to surface asphericity and asymmetry poses constraints on their application. Types of misfit are classified and, using least squares, the best-fit tool forms with different distances from the pole of the parent asphere are calculated. The outer mirror segment for the European extremely large telescope is taken as a case-study, assuming a rigid tool size of 150 mm. A simple independent approximation validates the calculation. A close parallel is wavefront misfit in subaperture interferometry, which is also considered. C 2011 Society of Photo-Optical Instrumentation Engineers (SPIE).

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<title>Development of optimal grinding and polishing tools for aspheric surfaces</title>

Cited by 21 publications

References 5 publications

Improving smoothing efficiency of rigid conformal polishing tool using time-dependent smoothing evaluation model

Improving smoothing efficiency of rigid conformal polishing tool using time-dependent smoothing evaluation model

Impact of pad material on stability of tool influnce function in CCOS

Misfit of rigid tools and interferometer subapertures on off-axis aspheric mirror segments

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