@misc{46861, author = {{Sajadi, Said}}, title = {{{Charakterisierung und Bewertung von flammgeschützten PA12 Pulvermischungen hinsichtlich der Verarbeitbarkeit im Lasersinter-Prozess}}}, year = {{2023}}, } @inproceedings{47084, abstract = {{Fused Deposition Modeling (FDM) is an additive manufacturing process to produce complex thermoplastic geometries layer by layer. The filament is melted in a nozzle, iteratively deposited, and then cools down. Due to the solidification process, the deposited filament strands deviate from their intended position due to shrinkage, resulting in significant geometric deviations in the final part. In terms of dimensional accuracy, there is a need for optimization, especially for local curved geometries in relation to the global part with higher nominal dimensions. The aim of this study is to investigate the size and shape deviations for cylindrical FDM elements and to compensate the expected deformations by using an in-house software with adaptive scaling factors in the x-y plane. Previous studies mainly focus on simple, non-curved objects, this study also considers the influence of curvature and global as well as local deviations on the final part.}}, author = {{Koers, Thorsten and Magyar, Balázs}}, booktitle = {{Proceedings of the 34th Annual International Solid Freeform Fabrication Symposium 2023}}, editor = {{Beaman, Joseph}}, location = {{Austin, Texas, USA}}, title = {{{Determination and Compensation of the Shrinkage Behavior of Cylindrical Elements in the FDM Process}}}, doi = {{https://doi.org/10.26153/tsw/50920}}, volume = {{34}}, year = {{2023}}, } @inproceedings{48790, abstract = {{To ensure uniform documentation of support structure information, a concept is presented that enables a standardized depiction of support structures in technical drawings based on ISO 128-3. To this end, requirements for a uniform depiction are defined and a procedure for drawing entry is presented. The drawing entry should contain all production-relevant support structure information. The standardized documentation of support structure information in technical drawings is intended to ensure a simple, clear and safe exchange of information between business units or different companies along the value chain. As a result a possible drawing entry of support structures was developed. To distinguish between different support structure types, a standardized depiction of geometrical information in a specification field is shown. The specification field gives a detailed description of the support structure type, the geometry as well as the connection to the part and the building platform. Also uncommon support types like lattice structures or CAD based support structures can be implemented. To ensure the usability the depictio is editable and extendable.}}, author = {{Lammers, Stefan and Koers, Thorsten and Magyar, Balázs and Zimmer, Detmar and Lieneke, Tobias}}, booktitle = {{Proceedings of the 34th Annual International Solid Freeform Fabrication Symposium 2023}}, editor = {{Beaman, Joseph}}, location = {{Austin, Texas, USA}}, title = {{{Depiction of support structures in technical drawings}}}, doi = {{https://doi.org/10.26153/tsw/50982}}, volume = {{34}}, year = {{2023}}, } @inproceedings{30229, author = {{Klippstein, Sven Helge}}, location = {{Online}}, title = {{{Reproducibility in Polymer Laser Sintering}}}, year = {{2022}}, } @inproceedings{33355, author = {{Klippstein, Sven Helge}}, location = {{Berlin}}, publisher = {{7. AM Forum Berlin}}, title = {{{Neue Polymerwerkstoffe - Der Schlüssel für die Industrialisierung}}}, year = {{2022}}, } @article{33859, author = {{Moritzer, Elmar and Elsner, Christian Lennart}}, journal = {{Macromolecular Symposia}}, location = {{Bukarest}}, number = {{1}}, publisher = {{Wiley}}, title = {{{Investigation and Improvement of Processing Parameters of a Copper-Filled Polymer Filament in Fused Filament Fabrication as a Basis for the Fabrication of Low-Porosity Metal Parts}}}, doi = {{https://doi.org/10.1002/masy.202100390}}, volume = {{404}}, year = {{2022}}, } @article{33861, author = {{Moritzer, Elmar and Wächter, Julian}}, journal = {{Macromolecular Symposia}}, location = {{Bukarest}}, number = {{1}}, publisher = {{Wiley}}, title = {{{Development of a Procedure for the Assessment of Material Potentials under Consideration of the Weld Seam Quality for Multi-Material Applications in the FDM Process}}}, doi = {{https://doi.org/10.1002/masy.202100389}}, volume = {{404}}, year = {{2022}}, } @misc{33987, author = {{Moritzer, Elmar and Elsner, Christian Lennart}}, booktitle = {{Kunststoffe}}, issn = {{0023–5563}}, title = {{{Mit Gestaltungsrichtlinien zum Erfolg}}}, volume = {{11/2022}}, year = {{2022}}, } @article{33862, author = {{Moritzer, Elmar and Driediger, Christine}}, journal = {{Macromolecular Symposia}}, location = {{Bukarest}}, number = {{1}}, publisher = {{Wiley}}, title = {{{Reactive Direct Bonding of Digital Light Process Components}}}, doi = {{https://doi.org/10.1002/masy.202100396}}, volume = {{404}}, year = {{2022}}, } @inproceedings{33852, author = {{Moritzer, Elmar and Hecker, Felix}}, booktitle = {{Proceedings of the 33rd Annual Freeform Fabrication Symposium}}, editor = {{Bourell, David L. and Beaman, Joseph J. and Crawford, Richard H. and Kovar, Desiderio and Seepersad, Carolyn C. and Tehrani, Mehran}}, location = {{Austin, Texas, USA}}, pages = {{2011--2018}}, title = {{{VALIDATION AND COMPARISON OF FEM-SIMULATION RESULTS OF THE FUSED DEPOSITION MODELING PROCESS UNDER CONSIDERATION OF DIFFERENT MESH RESOLUTIONS}}}, doi = {{10.26153/tsw/44657}}, year = {{2022}}, } @inproceedings{30220, abstract = {{In this work, the influences of spherical fillers on the processing properties and the resulting mechanical properties of laser sintered components are investigated. For this purpose, micro glass spheres, hollow glass bubbles and mineral spheres are dry blended to the matrix polymers polyamide 613 and polypropylene with a filling ratio of 20 and 40 vol%. First, relevant properties of the blends, such as powder flowability, thermal behavior and melt viscosity, are investigated. Based on the results, processing parameters are then developed for the LS process and the mechanical properties of the components are investigated. The aim is to be able to tailor the mechanical properties of LS components by adding fillers and thus to create new application areas for additively manufactured components. }}, author = {{Kletetzka, Ivo and Gawlikowicz, Roland and Schmid, Hans-Joachim}}, booktitle = {{Proceedings of the 33th Annual International Solid Freeform Fabrication Symposium}}, location = {{Austin}}, publisher = {{Laboratory for Freeform Fabrication and University of Texas}}, title = {{{Effects of spherical fillers on the processability and mechanical properties of PA613 and PP-based LS dry blends}}}, doi = {{http://dx.doi.org/10.26153/tsw/44558}}, volume = {{33}}, year = {{2022}}, } @inproceedings{32874, author = {{Kletetzka, Ivo and Klippstein, Sven Helge and Schmid, Hans-Joachim}}, booktitle = {{Proceedings of the 33th Annual International Solid Freeform Fabrication Symposium}}, location = {{Austin}}, publisher = {{Laboratory for Freeform Fabrication and University of Texas}}, title = {{{Shelf Life of Polyamide 12 (PA2200) Laser Sintering Powder}}}, doi = {{http://dx.doi.org/10.26153/tsw/44555}}, volume = {{33}}, year = {{2022}}, } @inproceedings{33853, author = {{Moritzer, Elmar and Hecker, Felix}}, booktitle = {{Proceedings of the 33rd Annual Freeform Fabrication Symposium}}, editor = {{Bourell, David L. and Beaman, Joseph J. and Crawford, Richard H. and Kovar, Desiderio and Seepersad, Carolyn C. and Tehrani, Mehran}}, location = {{Austin, Texas, USA}}, pages = {{1844--1858}}, title = {{{INVESTIGATION OF THE PROCESS PARAMETERS AND GEOMETRY DEPENDENT SHRINKAGE BEHAVIOR OF RASTER LINES IN THE FUSED DEPOSITION MODELING PROCESS}}}, doi = {{10.26153/tsw/44654}}, year = {{2022}}, } @article{30228, abstract = {{Confidence in additive manufacturing technologies is directly related to the predictability of part properties, which is influenced by several factors. To gain confidence, online process monitoring with dedicated and reliable feedback is desirable for every process. In this project, a powder bed monitoring system was developed as a retrofit solution for the EOS P3 laser sintering machines. A high-resolution camera records each layer, which is analyzed by a Region-Based Convolutional Neural Network (Mask R-CNN). Over 2500 images were annotated and classified to train the network in detecting defects in the powder bed at a very high level. Each defect is checked for intersection with exposure areas. To distinguish between acceptable imperfections and critical defects that lead to part rejection, the impact of these imperfections on part properties is investigated.}}, author = {{Klippstein, Sven Helge and Heiny, Florian and Pashikanti,, Nagaraju and Gessler, Monika and Schmid, Hans-Joachim}}, journal = {{JOM - The Journal of The Minerals, Metals & Materials Society (TMS)}}, location = {{Online}}, pages = {{1149–1157}}, publisher = {{Springer}}, title = {{{Powder Spread Process Monitoring in Polymer Laser Sintering and its Influences on Part Properties}}}, doi = {{https://doi.org/10.1007/s11837-021-05042-w }}, volume = {{74}}, year = {{2022}}, } @inproceedings{33356, abstract = {{By monitoring the recoating process within polymer laser sintering production, it was shown that multiple powder-spread-flaws can be detected. Those groove-like flaws are expected to be the result of agglomerates jamming between the recoater and the last powder layer. This work is analyzing the interaction between powder-spread-flaws and part properties, showing the influence of the recoating process on the performance of laser sintering parts. Therefore, artificial powder-spread-flaws are applied to the build jobs of tensile test specimens which are measured and analyzed regarding the elongation at break, strength and fracture position. For the characteristics of the flaws, the artificial grooves are varied in depth and width. Furthermore, the position of the flaw is changed form mid part to close to surface areas. It was shown, that several flaws are visible at the part surface, resulting in stress concentration and reduced performance. But there are as well parts with flaw-layers, which are not visible after the build process on the part. Those parts can have significantly reduced mechanical properties as well.}}, author = {{Klippstein, Sven Helge and Schmid, Hans-Joachim}}, booktitle = {{Proceedings of the 33nd Annual International Solid Freeform Fabrication Symposium}}, keywords = {{Selective Sasersintering, Process Monitoring, Powder Spread}}, title = {{{Powder Spread Flaws in Polymer Laser Sintering and its Influences on Mechanical Performance}}}, year = {{2022}}, } @inproceedings{31871, author = {{Kletetzka, Ivo and Klippstein, Sven Helge}}, booktitle = {{3D-DRUCK HAUTNAH - Der Einfluss einer Zukunftstechnologie auf unser Leben }}, location = {{Paderborn}}, publisher = {{Universität Paderborn}}, title = {{{Pulver im 3D-Druck - von Mascarabürsten bis zum Interieur eines Mini-Coopers (Vortrag)}}}, year = {{2022}}, } @misc{43011, author = {{Hanselle, Felix Paul}}, title = {{{Untersuchung und Modellierung der Materialeigenschaften von glaskugelgefüllten, im Lasersinterprozess verarbeiteten Dry-Blends}}}, year = {{2022}}, } @misc{43010, author = {{Kosanke, Maren}}, title = {{{Oberflächenmodifikation von Glaskugeln zur Verbesserung der Adhäsion im Lasersinterverfahren}}}, year = {{2022}}, } @misc{43007, author = {{Henke, Frederic}}, title = {{{Potenzialanalyse für die Nutzung additiver Fertigungsverfahren bei einem Büromöbelhersteller und Realisierung eines Beispielbauteils (Studienarbeit)}}}, year = {{2022}}, } @misc{46858, author = {{Ostermeier, Jakob}}, title = {{{Einfluss des Lasersinter-Prozesses auf die Recyclingfähigkeit von flammgeschütztem PA12 Pulver}}}, year = {{2022}}, }