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Application of Selective Laser Melting for precise optical components

Thursday (09.11.2017)
14:40 - 15:00
Part of:

Additive manufacturing offers great potential for lightweight design of structural parts due to the nearly unlimited possible complexity. This arises from the absence of mechanical cutting tools which restrict geometrical freedom in traditional machining technologies. The mentioned benefits may also be applied to precision optical parts. It will be shown that metal mirrors comprising complex geometries can be built by additive manufacturing, thereby reducing weight to a higher extent than possible before and maintaining high mechanical stiffness.

Near eutectic aluminum silicon alloys like AlSi10Mg or AlSi12 are already applied in the Selective Laser Melting process. Aluminum with approximately 40 weight percent silicon offers interesting properties such as increased stiffness and decreased density and coefficient of thermal expansion. This material, which can be regarded as a metal matrix composite is not yet qualified for additive technologies. This paper will show the feasibility of manufacturing AlSi40 via Selective Laser Melting, considering the evaluation of process parameters as well as subsequent treatments. The results will be supported by mechanical stability tests, stress analyses as well as porosity measurements and will show that additive manufactured parts can meet demands of high precision.

Dipl.-Ing. Enrico Hilpert
Fraunhofer Institute for Applied Optics and Precision Engineering IOF
Additional Authors:
  • Dr. Nils Heidler
    Fraunhofer Institute for Applied Optics and Precision Engineering
  • Dr. Stefan Risse
    Fraunhofer Institute for Applied Optics and Precision Engineering


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