| Popis: |
The combination of additive manufacturing and direct screwing can improve the disadvantages of the additive manufacturing such as long manufacturing times and high costs for expanding building spaces. Direct screwing allows smaller components to be assembled into larger components and added to assemblies as components with high functional integration. Therefor avoidance of large building spaces and a useful integration of additive components into serial production are possible. While guidelines for direct screwing of injection molded thermoplastic components are provided by the Deutscher Verein für Schweißen und verwandte Verfahren e.V., no recommendations for additively manufactured components exist. Preliminary investigation at the Kunststofftechnik Paderborn have shown that recommendations for injection molded components cannot be fully transmitted to additively manufactured components by analogy. Because of the layered manufacturing process additively manufactured components are highly anisotropic, why the strength of the components strongly depends on the build orientation. On this behalf, the suitability of additive manufactured components for direct screwing is investigated in a current research project at the Kunststofftechnik Paderborn. Topic of this presentation is the characterization of additively manufactured screw bosses in regard to the existing guidelines. For the characterization, screw domes are additively manufactured according to the geometry recommendations of the guidelines with the Fused-Deposition Modelling and the Selective Laser Sintering. To account for the anisotropy, the screw domes are built in three different orientations. The suitability of additively manufactured screw domes is evaluated through a comparison to injection molded screw bosses. For the comparison the joining parameters, the pull-out strength and the component strength are investigated. The results show that there are significant differences in the investigated criteria based on the manufacturing technique and the build orientation. |
