About this Abstract |
Meeting |
2022 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2022)
|
Symposium
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2022 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2022)
|
Presentation Title |
Use of a Fluid Interface to Reduce Support Structures in Top-down Stereolithography |
Author(s) |
Jenny M. Wang, Amit Jariwala, David Rosen |
On-Site Speaker (Planned) |
Jenny M. Wang |
Abstract Scope |
Stereolithography (SLA) is a vat photopolymerization additive manufacturing process which utilizes ultraviolet (UV) light energy to cure resin layer-by-layer to build parts. The fabrication of overhanging geometry in SLA typically requires sacrificial support structures. Printing supports increases fabrication time and material usage, and their removal prolongs the post-processing and has a detrimental effect on the surface quality of the final part. This study investigates a top-down mask projection SLA system in which a fluid of similar density to the cured resin is used to support the part during fabrication. The buoyant force of the displaced fluid counteracts the gravitational force the part experiences, thus reducing the need for support structures in overhangs. The overall system design is presented and the feasibility of using various components and materials is verified. Additionally, a predictive model of part deformation resulting from internal stresses, buoyant and gravitational forces, and dynamic reactionary forces is proposed. |
Proceedings Inclusion? |
Definite: Post-meeting proceedings |