Finishing of optical moulds to λ/20 by automated corrective polishing

A. Beaucamp; Y. Namba; I. Inasaki; H. Combrinck; R. Freeman

doi:10.1016/j.cirp.2011.03.110

Finishing of optical moulds to λ/20 by automated corrective polishing

A. Beaucamp, Y. Namba, I. Inasaki, H. Combrinck, R. Freeman

Research output: Contribution to journal › Article › peer-review

Abstract

Tungsten carbide is widely used to make replication moulds for small aspheric and freeform optics, like camera lenses. Since aspheric generation by grinding generally fails to reach ultra-precision criteria, a time efficient method for finishing moulds is needed. Using a 7-axis CNC polishing machine, an on-machine tool forming technique and compensation software were developed to correctively polish a plano WC surface of diameter 25 mm from a form error above λ to below λ/20 (29 nm P-V) in under 1 h, while reducing roughness to 1.0 nm Ra. This automatic method and tooling are applicable to aspheric and freeform moulds.

Original language	English
Pages (from-to)	375-378
Number of pages	4
Journal	CIRP Annals - Manufacturing Technology
Volume	60
Issue number	1
DOIs	https://doi.org/10.1016/j.cirp.2011.03.110
Publication status	Published - 2011
Externally published	Yes

Keywords

Finishing
Mould
Ultra-precision

ASJC Scopus subject areas

Mechanical Engineering
Industrial and Manufacturing Engineering

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10.1016/j.cirp.2011.03.110

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abstract = "Tungsten carbide is widely used to make replication moulds for small aspheric and freeform optics, like camera lenses. Since aspheric generation by grinding generally fails to reach ultra-precision criteria, a time efficient method for finishing moulds is needed. Using a 7-axis CNC polishing machine, an on-machine tool forming technique and compensation software were developed to correctively polish a plano WC surface of diameter 25 mm from a form error above λ to below λ/20 (29 nm P-V) in under 1 h, while reducing roughness to 1.0 nm Ra. This automatic method and tooling are applicable to aspheric and freeform moulds.",

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AU - Beaucamp, A.

AU - Namba, Y.

AU - Inasaki, I.

AU - Combrinck, H.

AU - Freeman, R.

PY - 2011

Y1 - 2011

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AB - Tungsten carbide is widely used to make replication moulds for small aspheric and freeform optics, like camera lenses. Since aspheric generation by grinding generally fails to reach ultra-precision criteria, a time efficient method for finishing moulds is needed. Using a 7-axis CNC polishing machine, an on-machine tool forming technique and compensation software were developed to correctively polish a plano WC surface of diameter 25 mm from a form error above λ to below λ/20 (29 nm P-V) in under 1 h, while reducing roughness to 1.0 nm Ra. This automatic method and tooling are applicable to aspheric and freeform moulds.

KW - Finishing

KW - Mould

KW - Ultra-precision

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Finishing of optical moulds to λ/20 by automated corrective polishing

Abstract

Keywords

ASJC Scopus subject areas

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