Influence of laser power fluctuations on the quality of additive manufactured workpieces

Heinl M, Galovskyi B, Bayer F, Laumer T, Hausotte T (2017)

Publication Language: English

Publication Type: Conference contribution

Publication year: 2017

Conference Proceedings Title: Lasers in Manufacturing (LiM)

Event location: Intertational Congress Center Munich DE

Abstract

There is a great potential in selective laser sintering (SLS) processes caused by increasing application areas in the field of additive manufacturing (AM). The related requirements to the quality of additive manufactured workpieces can be attributed to its process parameters. In this context, the examination of laser power fluctuations is interesting because of its direct influence on the workpiece quality. If the planar energy input into the powder bed is not constant, local areas can melt inhomogeneously beside the expected gauss-distributed intensity profile of the laser spot. For quality assessment a testing workpiece and its manufacturing strategy have been developed to measure the interactions between laser power and dimensional accuracy. Initially the appearing losses of the laser power in the beam path have been observed to optimize the energy input. In addition to the warm-up behaviour of the CO2-laser, appearing energy peaks during short-term sequences also show an influence on the workpiece quality. Finally in post-process quality assessment, the correlations of laser power with the dimensional accuracy and surface roughness are analysed by optical fringe projection and focus variation technique.

Authors with CRIS profile

Martin Lerchen Lehrstuhl für Fertigungsmesstechnik Bogdan Galovskyi Sonderforschungsbereich 814/3 Additive Fertigung Tobias Laumer Lehrstuhl für Photonische Technologien Tino Hausotte Lehrstuhl für Fertigungsmesstechnik

Additional Organisation(s)

Lehrstuhl für Fertigungsmesstechnik

Related research project(s)

Geometric measuring and testing technologies for Additive Manufacturing (C4) (SFB 814 (C4)) CRC 814 - Additive Manufacturing (SFB 814) July 1, 2011 - June 30, 2023

How to cite

APA:

Heinl, M., Galovskyi, B., Bayer, F., Laumer, T., & Hausotte, T. (2017). Influence of laser power fluctuations on the quality of additive manufactured workpieces. In Wissenschaftliche Gesellschaft Lasertechnik e.V. (WLT) (Eds.), Lasers in Manufacturing (LiM). Intertational Congress Center Munich, DE.

MLA:

Heinl, Martin, et al. "Influence of laser power fluctuations on the quality of additive manufactured workpieces." Proceedings of the Lasers in Manufacturing (LiM), Intertational Congress Center Munich Ed. Wissenschaftliche Gesellschaft Lasertechnik e.V. (WLT), 2017.

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