Description
The demand for customized products and the pressure to accelerate product development are accelerating the industrialization of material-efficient, laser-based additive manufacturing [1]. As a result, prototypes can be produced quickly and cost-effectively with material properties equivalent to those conventionally manufactured [2]. The resulting accelerated development process significantly improves competitiveness, especially for complex products [3]. In mold and tool making, near-contour cooling increases the possible yield rate and the life-time of tools [4] and new applications in medical technology enable a highly individualized manufacturing of implants [5]. There are currently numerous fields of activity [6] for the technology laser powder bed fusion (LPBF) of metals. These concern the insufficient training opportunities for personnel [7], the reproducibility of component quality [8], the lack of design guidelines and the inadequate communication of these guidelines [9], scientifically based application research [10] and strict framework conditions for occupational safety [P1], as well as legal issues [6].Despite intensive research in the simulation of laser-based additive manufacturing processes, the understanding of the physical interaction processes has not yet been sufficiently developed. Therefore, real-time monitoring systems are required to generate new knowledge [11]. To monitor the interaction zone of laser beam and powder, coaxial setups have been sold since 2016. These allow a high temporal and spatial resolution of the entire manufacturing process and thus theoretically enable a component data set comparable to an ex-situ computed tomography. Coaxial melt pool monitoring (CMPM) systems are still insufficiently investigated and underrepresented in research institutions. This thesis deals with the process monitoring of the LPBF and aims to extend the process understanding and the signal understanding of a CMPM and to derive possible applications for the process monitoring as well as an outlook on a controlled process.
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