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Erschienen in:
2021 | OriginalPaper | Buchkapitel
Design of Additively Manufactured Heat-Generating Structures
verfasst von : Karl Hilbig, Hagen Watschke, Thomas Vietor
Erschienen in: Technologies for economic and functional lightweight design
Verlag: Springer Berlin Heidelberg
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Abstract
Multi-material additive manufacturing provides new design freedom for integration of functions and opens new possibilities in innovative product design due to local material variations. In particular, material extrusion (MEX) allows for combination of different industrial-grade thermoplastic materials to enhance the functionality of a product by integration of functions. Thus, for instance, electrically conductive structures or heat-generating surfaces can be incorporated in a part by using conductive polymers filled by carbon black (CB), carbon nanotubes (CNT) or copper nanowires (CNW).
The resultant properties of additively manufactured parts are mainly influenced by the choice of process parameters. In addition to mechanical properties (e.g. stiffness and strength), electrical properties are also like resistivity and volumetric power density influenced. In order to design heat-generating structures in a targeted manner, the dependencies between process parameters and electrical performance must be determined. Thus, in this article the dependencies between the process parameters extrusion temperature, raster angle orientation and extrusion speed are investigated experimentally. In order to adjust the resistivity of an additively manufactured part and surface temperature by resistive heating, these dependencies are transferred into mathematical descriptions. The setup of design of experiment is based on model selection for analytical description of material-specific characterization.
In order to demonstrate the potential of additively manufactured heating structures by material extrusion a garnish mold with incorporated heating panels is built as multi-material design. Finally, the heating of the prototypical panel is analyzed by thermographic analyses. Thus, the approach for achieving certain surface temperatures by varying process parameters and part geometry based on the mathematical description is validated.