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    Item type:Publication, Access status: with files ,
    Design guidelines for material extrusion of metals (MEX/M)
    (Multidisciplinary Digital Publishing Institute (MDPI), 2025-05-28)
    Asami, Mohammad Karim
    ;
    Medapati, Mehar Prakash Reddy
    ;
    Rakow, Titus
    ;
    Röver, Tim
    ;
    Emmelmann, Claus
    This study introduced a systematic framework to develop practical design guidelines specifically for filament-based material extrusion of metals (MEX/M), an additive manufacturing (AM) process defined by ISO/ASTM 52900. MEX/M provides a cost-efficient alternative to conventional manufacturing methods, which is particularly valuable for rapid prototyping. Although AM offers significant design flexibility, the MEX/M process imposes distinct geometric and process constraints requiring targeted optimization. The research formulates and validates design guidelines tailored for the MEX/M using an austenitic steel 316L (1.4404) alloy filament. The feedstock consists of a uniform blend of 316L stainless steel powder and polymeric binder embedded within a thermoplastic matrix, extruded and deposited layer by layer. Benchmark parts were fabricated to examine geometric feasibility, such as minimum printable wall thickness, feature inclination angles, borehole precision, overhang stability, and achievable resolution of horizontal and vertical gaps. After fabrication, the as-built (green-state) components undergo a two-step thermal post-processing treatment involving binder removal (debinding), followed by sintering at elevated temperatures to reach densification. Geometric accuracy was quantitatively assessed through a 3D scan by comparing the manufactured parts to their original CAD models, allowing the identification of deformation patterns and shrinkage rates. Finally, the practical utility of the developed guidelines was demonstrated by successfully manufacturing an impeller designed according to the established geometric constraints. These design guidelines apply specifically to the machine and filament type utilized in this study.
    Publicationtype: Journal Article
      23  19
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    Item type:Publication, Access status: without files ,
    Kollaborative Produktentwicklung in der Additiven Fertigung (3D-Druck) mittels Virtueller Realität
    (2024)
    Rullan Lemke, Christina
    ;
    Medapati, Mehar Prakash Reddy
    ;
    Waldschmidt, Johannes
    In der modernen Arbeitswelt ist die industrielle Entwicklung neuer Produkte ein hochkomplexer Prozess, der das Spezialwissen und die Koordination verschiedener Partner entlang der Wertschöpfungskette voraussetzt. Dabei ist die Effizienz der Entwicklung eines Prototypen in entscheidender Weise von der störungsfreien Kommunikation aller Partner, der Vermeidung von Missverständnissen oder Informationsverlusten sowie zeit- und materialsparenden Designabläufen abhängig. In der Additiven Fertigung (3D-Druck) besteht der Produktentwicklungsprozess aus den – meist iterativen – Schritten Produktdesign, Datenvorbereitung, Fertigung und einer abschließenden Nachbearbeitung. Diese verschiedenen Arbeitsschritte liegen jedoch nicht in einer Hand, sondern verteilen sich zumeist auf mehrere hochspezialisierte Dienstleister. Zur Verdeutlichung der Projektidee von KoPro-VR wird zunächst ein konventioneller Produktentwicklungsablauf detailliert betrachtet, um die ihm innewohnenden Problemstellen und Defizite näher zu beleuchten.
    Publicationtype: Blog Post
      59