Dr.

Günther, Daniel

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  • Publication
    Characterization of Slurry-Cast Layer Compounds for 3D Printing of High Strength Casting Cores
    ( 2021)
    Erhard, Patricia
    ;
    Angenoorth, Jan
    ;
    Vogt, Joachim
    ;
    Spiegel, Johannes
    ;
    Ettemeyer, Florian
    ;
    Volk, Wolfram
    ;
    Günther, Daniel
    Additive manufacturing of casting cores and molds is state of the art in industrial application today. However, improving the properties of chemically bonded casting cores regarding temperature stability, bending strength, and surface quality is still a major challenge. The process of slurry-based 3D printing allows the fabrication of dense structures and therefore sinterable casting cores. This paper presents a study of the slurry-based fabrication of ceramic layer compounds focusing on the drying process and the achievable properties in slurry-based 3D printing of casting cores. This study aims at contributing to a better understanding of the interrelations between the drying conditions in the 3D printing process and the properties of sintered specimens relating thereto. The drying intensity influenced by an IR heater as well as the drying periods are varied for layer thicknesses of 50, 75, and 100 µm. Within this study, a process window applicable for 3D printing of sinterable casting cores is identified and further indications are given for optimization potentials. At layer heights of 75 µm, bending strengths between ~8 and 11 MPa as well as densities of around 50% of the theoretical density were achieved. Since the mean roughness depth Rz is determined to be <30 µm in plane, an application of slurry-based 3D printing in investment casting is conceivable.
  • Publication
    3D Printed Sand Tools for Thermoforming Applications of Carbon Fiber Reinforced Composites - A Perspective
    ( 2021)
    Günther, Daniel
    ;
    Erhard, Patricia
    ;
    Schwab, Simon
    ;
    Taha, Iman
    Tooling, especially for prototyping or small series, may prove to be very costly. Further, prototyping of fiber reinforced thermoplastic shell structures may rely on time-consuming manual efforts. This perspective paper discusses the idea of fabricating tools at reduced time and cost compared to conventional machining-based methods. The targeted tools are manufactured out of sand using the Binder Jetting process. These molds should fulfill the demands regarding flexural and compressive behavior while allowing for vacuum thermoforming of fiber reinforced thermoplastic sheets. The paper discusses the requirements and the challenges and presents a perspective study addressing this innovative idea. The authors present the idea for discussion in the additive manufacturing and FRP producing communities.