Fraunhofer-Institut für Produktionsanlagen und Konstruktionstechnik IPK

Filters
Reset filters

Settings
Now showing 1 - 10 of 325
No Thumbnail Available
Publication

Effects on the distortion of Inconel 718 components along a hybrid laser-based additive manufacturing process chain using laser powder bed fusion and laser metal deposition

2021 , Uhlmann, E. , Düchting, J. , Petrat, T. , Krohmer, E. , Graf, B. , Rethmeier, M.

The combination of laser powder bed fusion (LPBF), known for its geometrical freedom and accuracy, and the nozzle-based laser metal deposition process (LMD), known for its high build-up rates, has great potential to reduce the additive manufacturing times for large metallic parts. For the industrial application of the LPBF-LMD hybrid process chain, it is necessary to investigate the influence of the LMD process on the LPBF substrate. In addition, the build plate material also has a significant impact on the occurrence of distortion along the additive manufacturing process chain. In the literature, steel build plates are often used in laser-based additive manufacturing processes of Inconel 718, since a good metallurgical bonding can be assured whilst reducing costs in the production and restoration of the build plates. This paper examines the distortion caused by LMD material deposition and the influence of the build plate material along the hybrid additive manufacturing process chain. Twin cantilevers are manufactured by LPBF and an additional layer is subsequently deposited with LMD. The distortion is measured in the as-built condition as well as after heat treatment. The effect of different LMD hatch strategies on the distortion is determined. The experiments are conducted using the nickel-base alloy Inconel 718. The results show a significant influence of LMD path strategies on distortion, with shorter tool paths leading to less distortion. The remaining distortion after heat treatment is considerably dependent on the material of the build plate.

View
No Thumbnail Available
Publication

Einsatzverhalten von CVD-Diamantdünnschichtwerkzeugen

2019 , Uhlmann, E. , Hinzmann, D.

View
No Thumbnail Available
Publication

Mikrofräsbearbeitung von MMC-Werkstoffschichten unter Einsatz von binderlosem PKD. Analyse des Einflusses der Prozessparameter auf den Mikrofräsprozess

2019 , Hein, C. , Uhlmann, E. , Polte, J. , Wiesner, H.M. , Jahnke, C. , Polte, M.

Micro-injection moulding is a key technology for the cost-effective production of plastic parts. The commonly used moulds are made of hardened steel and machined by micro-milling with coated cemented carbide tools. Today, these tools suffer from random tool breakage and excessive wear. One solution of this problem is to produce injection moulds made of non-ferrous metals and enhance them by applying a tungsten carbide matrix on the surface. Thus, this investigation addresses the micro-milling process of the resulting Metal-Matrix-Composites. Furthermore, the feasibility of binderless polycrystalline diamond as an innovative cutting material could be shown for this purpose

View
No Thumbnail Available
Publication

Elektromechanisches Glattwalzen von Stahllegierungen

2019 , Uhlmann, E. , Thom, S. , Prasol, L. , Haberbosch, K. , Drieux, S.

View
No Thumbnail Available
Publication

Verfügbarkeitssteigerung durch gezielte Datenanalyse

2020 , Uhlmann, E.

View
No Thumbnail Available
Publication

Nachbearbeitung additiv gefertigter Titanbauteile - Potentiale des Fliehkraftgleitschleifens

2019 , Uhlmann, E. , Eulitz, A. , Seiffert, K. , Kersting, R. , Schenk, S.

Additive manufactured parts can be post-processed by centrifugal disc finishing as bulk. The choice of suitable media is of high importance for economic post-processing. In this paper, topography and shape changes of machined workpieces are investigated and a multistage process for post-processing additive manufactured Titanium parts is developed.

View
No Thumbnail Available
Publication

Profilverschleißreduzierung beim Planschleifen

2019 , Lichtschlag, L. , Uhlmann, E.

View
No Thumbnail Available
Publication

Niobcarbid statt Wolframcarbid Alternativer Schneidstoff in der Drehbearbeitung

2019 , Kropidlowski, K. , Uhlmann, E. , Woydt, M. , Theiler, G. , Gradt, T.

View
No Thumbnail Available
Publication

Hochleistungsbohrwerkzeuge für CFK

2019 , Uhlmann, E. , Christiansen, G. , Reimers, W. , Brömmelhoff, K.

View
No Thumbnail Available
Publication

Einfluss der Schärfparameter auf die Schleifscheibentopographie

2019 , Uhlmann, E. , Muthulingam, A.

View