Prozessüberwachung beim Laser-Strahlschmelzen mit akustischen Signalen*/Monitoring a laser beam melting process with acoustic signals

2017 ◽  
Vol 107 (11-12) ◽  
pp. 818-823
Author(s):  
N. Eschner ◽  
J. Lingenhöhl ◽  
S. Öppling ◽  
G. Prof. Lanza
Keyword(s):  
Laser Beam ◽  
Acoustic Waves ◽  
Ultrasonic Inspection ◽  
Melting Process ◽  
Acoustic Signals ◽  
Inspection System ◽  
Near Surface ◽  
Surface Areas ◽  
Melt Pool ◽  
Laser Beam Melting

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.

Laser beam melting process based on complete-melting energy density for commercially pure titanium

2019 ◽  
Vol 45 ◽  
pp. 455-459 ◽  
Author(s):  
Hyung Giun Kim ◽  
Won Rae Kim ◽  
Ohyung Kwon ◽  
Gyung Bae Bang ◽  
Min Ji Ham ◽  
...  
Keyword(s):  
Energy Density ◽  
Laser Beam ◽  
Pure Titanium ◽  
Melting Process ◽  
Commercially Pure Titanium ◽  
Commercially Pure ◽  
Complete Melting ◽  
Laser Beam Melting

Packets of Capillary and Acoustic Waves of Drop Impact

2021 ◽  
pp. 73-91
Author(s):  
Yu.D. Chashechkin
Keyword(s):  
Acoustic Waves ◽  
High Speed ◽  
Large Scale ◽  
Video Camera ◽  
Acoustic Signals ◽  
Capillary Waves ◽  
Near Surface ◽  
Large Scale Analysis ◽  
High Speed Video Camera ◽  
Hydro Phone

Flows, capillary waves, and acoustic signals generated by a drop of water falling into a pool of degassed liquid were recorded by a high-speed video camera, hydro-phone, and microphone. A large-scale analysis of the system of equations was performed. The fast conversion of available surface potential energy is traced. The converted energy is stored in a thin layer in the vicinity of the merged free surfaces and creates large perturbations of temperature, pressure and flow velocity. Capillary waves start to radiate simultaneously with the formation of a cavity and the rise of the crown. New groups of capillary waves arise with all changes in the flow structure --- the formation and immersion of a splash, come back of secondary drops, the formation of cavities, the immersion of a streamer and droplets. Simultaneously with the waves, ligaments --- thin near-surface flows are formed that affect the transport and rupture of gas cavities. Thin flows quickly decay and form again when a new group of capillary waves is generated. A comparison of flow patterns and acoustic signals indicates that the generation of resonant sound packets is synchronized with the pinch-off gas fragments from the cavity or their breaking. The duration of the sound depends on the initial heterogeneity of the geometry of the sounding cavity, gradually transforming into a smooth spheroidal form

scholarly journals Melt pool monitoring for laser beam melting of metals: inline-evaluation and remelting of surfaces

Procedia CIRP ◽  
2018 ◽  
Vol 74 ◽  
pp. 111-115 ◽  
Author(s):  
Tobias Kolb ◽  
Lars Müller ◽  
Jan Tremel ◽  
Michael Schmidt
Keyword(s):  
Laser Beam ◽  
Melt Pool ◽  
Laser Beam Melting

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

2014 ◽  
Vol 56 ◽  
pp. 390-399 ◽  
Author(s):  
Alexander Ilin ◽  
Ruslan Logvinov ◽  
Alexander Kulikov ◽  
Andrey Prihodovsky ◽  
Hongxiao Xu ◽  
...  
Keyword(s):  
Laser Beam ◽  
Thermal Management ◽  
Melting Process ◽  
Laser Beam Melting ◽  
Computer Aided

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

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

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

Procedia CIRP ◽  
2014 ◽  
Vol 25 ◽  
pp. 146-153 ◽  
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

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

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.

Sign in / Sign up

Export Citation Format

Share Document