Precision manufacturing of a lightweight mirror body made by selective laser melting
Autor: | Stefan Risse, Johannes Hartung, Ramona Eberhardt, Andreas Tünnermann, Enrico Hilpert |
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Přispěvatelé: | Publica |
Rok vydání: | 2018 |
Předmět: |
0209 industrial biotechnology
Fabrication Materials science Electroless nickel plating Alloy General Engineering FOS: Physical sciences Mechanical engineering Polishing Stiffness Applied Physics (physics.app-ph) Physics - Applied Physics 02 engineering and technology Diamond turning Substrate (printing) engineering.material 01 natural sciences 010309 optics 020901 industrial engineering & automation 0103 physical sciences engineering medicine Selective laser melting medicine.symptom |
Zdroj: | Precision Engineering. 53:310-317 |
ISSN: | 0141-6359 |
Popis: | This article presents a new and individual way to generate opto-mechanical components by Additive Manufacturing, embedded in an established process chain for the fabrication of metal optics. The freedom of design offered by additive techniques gives the opportunity to produce more lightweight parts with improved mechanical stability. The latter is demonstrated by simulations of several models of metal mirrors with a constant outer shape but varying mass reduction factors. The optimized lightweight mirror exhibits $63.5 \%$ of mass reduction and a higher stiffness compared to conventional designs, but it is not manufacturable by cutting techniques. Utilizing Selective Laser Melting instead, a demonstrator of the mentioned topological non-trivial design is manufactured out of AlSi12 alloy powder. It is further shown that -- like in case of a traditional manufactured mirror substrate -- optical quality can be achieved by diamond turning, electroless nickel plating, and polishing techniques, which finally results in $< 150$~nm peak-to-valley shape deviation and a roughness of $< 1$~nm rms in a measurement area of $140 \times 110$ $��$m${}^2$. Negative implications from the additive manufacturing are shown to be negligible. Further it is shown that surface form is maintained over a two year storage period under ambient conditions. 13 pages, 19 figures, online version (corrected proof) |
Databáze: | OpenAIRE |
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