Abstract
Binder jetting is a powder bed additive manufacturing process where an object is created by depositing liquid binder onto the surface of powder, selectively binding particles in each layer. The quality of the as-printed parts is influenced not only by process parameters such as layer thickness, binder saturation, print speed, and drying time but also by the location within the build box. This study highlights the location-dependent nature of green density and dimensional accuracy in the as-printed samples, and the observed trends are thoroughly discussed. A conventional powder spreading using a single roller was compared with a double roller to maximize powder packing and bed uniformity prior to binder jetting process. The significance of these observations lies in their impact on densification behavior, shrinkage, and the final geometry of the printed part.
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Funding
AM would like to acknowledge the startup funding from the Department of Mechanical, Materials and Aerospace Engineering and Armour College of Engineering at Illinois Institute of Technology at Chicago, Illinois. This research was funded, in part, by the Commonwealth of Pennsylvania’s Department of Community and Economic Development (DCED), the Pennsylvania Infrastructure Technology Alliance (PITA), and the first round of the PA Manufacturing Innovation Program (PAMIP). Acknowledgments to Prof. A.D. Rollett for supporting in securing funding for this research through PITA and PAMIP. Also, Kennametal Inc. is acknowledged for providing powder for this research. Partial support from the National Science Foundation under grant number DMR-2050916 is appreciated by MD and AM.
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M.D.: formal analysis, investigation, visualization. M.K.: investigation, analysis. M.J.: investigation, analysis. A.M.: conceptualization, methodology, investigation, visualization, supervision, project administration, funding acquisition, writing-original draft, review and editing.
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Dorula, M., Khademitab, M., Jamalkhani, M. et al. Location dependency of green density and dimension variation in binder jetted parts. Int J Adv Manuf Technol 132, 2853–2861 (2024). https://doi.org/10.1007/s00170-024-13529-4
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DOI: https://doi.org/10.1007/s00170-024-13529-4