3 research outputs found
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Error Detection in Laser Beam Melting Systems by High Resolution Imaging
Laser Beam Melting as a member of Additive Manufacturing processes allows the
fabrication of three-dimensional metallic parts with almost unlimited geometrical complexity and
very good mechanical properties. However, its potential in areas of application such as aerospace
or medicine has not yet been exploited due to the lack of process stability and quality
management. For that reason samples with pre-defined process irregularities are built and the
resulting errors are detected using high-resolution imaging. This paper presents an overview of
typical process errors and proposes a catalog of measures to reduce process breakdowns. Based
on this systematical summary a future contribution to quality assurance and process
documentation is aspired.Mechanical Engineerin
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Position Dependency of Surface Roughness in Parts from Laser Beam Melting Systems
Laser Beam Melting is a promising Additive Manufacturing technology for the production of complex
metal components. During batch production of multiple identical parts in a single build job, we observed parts
with deviating surface roughness in certain areas, which all faced away from the laser. This suggests a dependency
of surface roughness on the part position in the build chamber. In this work we systematically reproduce and
analyze this effect. We place hollow pyramids with twelve faces and two different overhanging angles at nine
positions on the substrate plate and build this setup twice, using an imaging setup for process documentation.
Surface roughness is measured by contact profilometry on three lines for each pyramid face. Our experiments
reproduce the effect. Based on these findings we present a hypothesis for the cause and show metallographic
images to support our theory. As a consequence, the position relative to the laser should be considered in the
design phase for parts with high surface quality requirements.Mechanical Engineerin