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| Azevedo, Nuno Monteiro |
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Quagliotti, Danilo
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Publications (10/10 displayed)
- 2024Surface roughness of the parts produced by Tomographic Volumetric Printing (TVP) process
- 2019Modelling the filling behavior of micro structured plastic optical components
- 2018Multiscale dimensional tolerance specifications established on shrinkage assessment in ceramic micro injection moldingcitations
- 2018Manufacturing Signatures of Injection Molding and Injection Compression Molding for Micro-Structured Polymer Fresnel Lens Productioncitations
- 2018Evaluation of injection pressure as a process fingerprint for Injection and Injection Compression Molding of micro structured optical components
- 2017Replication assessment of surface texture at sub-micrometre scale
- 2017Multi Scale Micro and Nano Metrology for Advanced Precision Moulding Technologies
- 2016An international comparison of surface texture parameters quantification on polymer artefacts using optical instrumentscitations
- 2016Metrology of sub-micron structured polymer surfaces
- 2016Performance verification of focus variation and confocal microscopes measuring tilted ultra-fine surfaces
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document
Modelling the filling behavior of micro structured plastic optical components
Abstract
In the case of micro structured and freeform optics, such as Fresnel lenses, the challenges related to the filling of the samples address to formation of weld lines, cavity balance and mostly full replication of the part and its surface features. Even though simulation and modelling can help predict such errors, when dealing with micro structured components the multi-scale requirements of the problem become a challenge. Not only the model definition, but also more practical aspects, as model validation and the definition of the boundary conditions as meshing are time consuming, complex but necessary steps. In this research, modelling of the filling behavior of a micro structured optical component is performed and validated comparing Injection Molding simulation with measured Injection Molded parts. The adoption of different polymer dosages addresses the investigation on “short shots”, in this way the filling of the part could be investigated at different injection instances. The comparison encompasses both micro- and meso- scale quantities, such as the injection pressure measured at the screw, the part mass, and the height of the micro features. The results show that the adopted modelling solution is in accordance with the experimental results at both the geometrical scales.