About this Abstract |
Meeting |
2025 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2025)
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Symposium
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2025 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2025)
|
Presentation Title |
Packing Fraction Sensing in Metal Binder Jetting Using Airborne Ultrasound Transducer |
Author(s) |
Alexander Martinez-Marchese, Chen Qian, Chinedum Okwudire |
On-Site Speaker (Planned) |
Alexander Martinez-Marchese |
Abstract Scope |
Binder jetting is a promising additive manufacturing technology offering advantages including higher printing speed and lower residual stress in printed parts. Packing density is an important process parameter that affects printing quality. A lower packing fraction can result in larger shape distortion and lower strength in printed parts. However, locally measuring packing fraction during the printing process has not been studied in current literature. This research investigates the possibility of local packing fraction sensing using an airborne ultrasound transducer. The sensor sends ultrasound signals to the powder bed, and the amplitude difference of the returned signal is related to the acoustic impedance of the powder, which correlates to packing fraction. A customized setup was built to collect reflected signal amplitudes from powder beds with different packing fractions. Furthermore, ultrasound transducers with different resonance frequencies were used to provide insight into the frequency dependence of the returned signals and sensor sensitivity. |
Proceedings Inclusion? |
Planned: Post-meeting proceedings |