Computer Aided Optimisation of the Thermal Management During Laser Beam Melting Process

Gegenwärtig ist bei der additiven Fertigung eine prozessbegleitende Überwachung des Bauteils auf das Schmelzbad und oberflächennahe Bereiche limitiert. Mithilfe akustischer Signale lassen sich typische Defekte, die im Rahmen des LBM (laser beam melting – Laserstrahlschmelzen)-Verfahrens auftreten, detektieren. Dies umfasst neben Porosität und Rissen auch Eigenspannungen. In diesem Fachbeitrag werden die Möglichkeit eines in den LBM-Prozess integrierten akustischen Prüfsystems sowie alternative Sensorkonzepte diskutiert und evaluiert.   Current process monitoring techniques for additive manufacturing are limited to the melt pool and near-surface areas. Typical defects that occur within the LBM-process, such as porosity and cracks, as well as residual stress, can be detected by using acoustic waves. In this article, the possibility of an integrated ultrasonic inspection system, as well as various sensor concepts are discussed and evaluated.

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Thermo-mechanical simulation of track development in the Laser Beam Melting process - Effect of laser-metal interaction

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/529/1/012005 ◽

2019 ◽

Vol 529 ◽

pp. 012005

Author(s):

Alexis Queva ◽

Yaasin Mayi ◽

Michel Bellet ◽

Gildas Guillemot ◽

Patrice Peyre ◽

...

Keyword(s):

Laser Beam ◽

Melting Process ◽

Mechanical Simulation ◽

Metal Interaction ◽

Laser Beam Melting

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Simulation of the Laser Beam Melting Process – Approaches for an Efficient Modelling of the Beam-material Interaction

Procedia CIRP ◽

10.1016/j.procir.2014.10.023 ◽

2014 ◽

Vol 25 ◽

pp. 146-153 ◽

Cited By ~ 10

Author(s):

C. Seidel ◽

M.F. Zaeh ◽

M. Wunderer ◽

J. Weirather ◽

T.A. Krol ◽

...

Keyword(s):

Laser Beam ◽

Melting Process ◽

Laser Beam Melting ◽

Material Interaction

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Flow Characteristics of Porous Metal Structures for Specified Permeability Manufactured by Laser Beam Melting Technology

Volume 2A: Advanced Manufacturing ◽

10.1115/imece2014-39672 ◽

2014 ◽

Author(s):

F.-K. Benra ◽

H. J. Dohmen ◽

S. Clauss ◽

J. T. Sehrt ◽

G. Witt

Keyword(s):

Numerical Model ◽

Laser Beam ◽

Gas Flow ◽

Flow Characteristics ◽

Porous Metal ◽

Melting Process ◽

Test Body ◽

Metal Structures ◽

Melting Technology ◽

Laser Beam Melting

The characteristic additive build-up at the laser beam melting technology provides the opportunity to freeform porous and defined structures at specific areas in one part. By adjusting the process parameters specific characteristics of the manufactured part such as density, permeability, pore size, porosity and shear strength can be realized. The manufacturing process of a test body is described in detail. The permeability of the manufactured parts is investigated experimentally. In addition a numerical model is build and the flow structure inside of the test body is illustrated. The numerically obtained results are compared to the experimentally obtained results. To show the advantages of this technology for future applications a numerical model of a porous blade surrounded by a hot gas flow and cooled from inside of the porous structure is investigated. The results show that the method to define the characteristics during the laser beam melting process has to be optimized.

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