Mould fabrication for polymer optics

Speich, Marco; Börret, Rainer

doi:10.2971/jeos.2011.11050

Cited by 8 publications

(7 citation statements)

References 7 publications

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“…Molds referring to cavity 1 or 2 were polished with different techniques (cavity 1 corresponds to polishing group 1 and cavity 2 respectively) to test if the measurement setup was able to resolve geometry changes due to surface polishing and to discriminate between different techniques. Cavity 1 was rotation -symmetrically polished with a round polishing mask and a manual finishing through an experienced polisher [1]. Cavity 2 was manual polished with different types of adapted polishing heads (various sizes, materials and geometries).…”

Section: Samplesmentioning

confidence: 99%

“…Occupational eye wear such as safety shields and goggles are usually manufactured by polycarbonate injection molding [1] [2] [3]. A typical molding tool (referred to as tool) for safety goggles includes two or more cavities (hollow of the tool where the liquid plastic is to be injected) for simultaneous production of multiple identical parts in one step.…”

Section: Introductionmentioning

confidence: 99%

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Deflectometric analysis of high volume injection molds for production of occupational eye wear

Speck

Zelzer

Speich

et al. 2013

Zeitschrift für Medizinische Physik

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Section: Samplesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Deflectometric analysis of high volume injection molds for production of occupational eye wear

Speck

Zelzer

Speich

et al. 2013

Zeitschrift für Medizinische Physik

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“…They were rotationally polished with a round polishing mask and a manual finishing through an experienced polisher. Cavity one was polished with a fully automated polishing technique (robot with polishing head) [15,16]. The polishing path was arranged in a circular manner.…”

Section: Samples and Measuring Processmentioning

confidence: 99%

Quality control of injection molded eyewear by non-contact deflectometry

Speck

Zelzer

Langenbucher

et al. 2014

J. Eur. Opt. Soc.-Rapid Publ.

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Occupational eye wear such as safety spectacles are manufactured by injection molding techniques. Testing of the assembled safety spectacle lenses in transmission is state of the art, but there is a lack of surface measurement systems for occupational safety lenses. The purpose of this work was to validate a deflectometric setup for topography measurement, detection of defects and visualization of the polishing quality, e.g. casting indentations or impressions, for the production process of safety spectacles. The setup is based on a customized stereo phase measuring deflectometer (PMD), equipped with 3 cameras with f'1,2 = 16 mm and f'3 = 8.5 mm and a specified measurement uncertainty of ± 3 µm. Sixteen plastic lenses and 8 corresponding injection molds from 4 parallel cavities were used for validation of the deflectometer. For comparison an interferometric method and a reference standard (< λ/10 super polished) was used. The accuracy and bias with a spherical safety spectacle sample was below 1 µm, according to DIN ISO 5725-2.2002-12. The repeatability was 2.1 µm and 35.7 µm for a blind radius fit. In conclusion, the PMD technique is an appropriate tool for characterizing occupational safety spectacle and injections mold surfaces. With the presented setup we were able to quantify the surface quality. This can be useful and may optimize the quality of the end product, in addition to standardized measuring systems in transmission.

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“…A particular type of plastic injection moulding is the production of plastic optics. The quality of the moulded products depends on the surface quality and shape deviations of the respective mould (Speich & Boerret, 2011). The produced moulds do not always have a spherical shape; some moulds are also cylindrical shaped .…”

Section: Introductionmentioning

confidence: 99%

Geometrical shape improvement of steel moulds by robot polishing process for polymer optic replication

Almeida

Börret

Pohl

et al. 2018

Production & Manufacturing Research

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The quality of injection-moulded polymer optic parts depends on the surface finish of the respective mould. In order to improve the surface finish of the mould, it is important to use a tactical material removal, which allows a controlled correction of the mould's surface geometry. The aim of this work is to use a polishing correction technique to improve and correct the flatness of hardened steel samples in order to reduce the need for manual polishing. A polishing tool function is simulated from the contact between the tool and the hardened steel sample and used to determine the material removal rate per time. A feed profile is calculated, which allows the industrial robot to tactically control the material removal. It is observed that a correction improves the surface's flatness by up to 70%. ARTICLE HISTORY

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Mould fabrication for polymer optics

Cited by 8 publications

References 7 publications

Deflectometric analysis of high volume injection molds for production of occupational eye wear

Deflectometric analysis of high volume injection molds for production of occupational eye wear

Quality control of injection molded eyewear by non-contact deflectometry

Geometrical shape improvement of steel moulds by robot polishing process for polymer optic replication

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