An Integrative Experimental Approach to Design Optimization and Removal Strategies of Supporting Structures Used during L-PBF of SS316L Aortic Stents
| Autor: | Naresh Nadammal, Ulrich Schultheiss, Philipp Lulla, Marius Grad, Ulf Noster |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
laser powder bed fusion
Technology Computer science QH301-705.5 QC1-999 Mechanical engineering Polishing supporting structures Distortion Component (UML) Sand blasting General Materials Science Biology (General) Lead (electronics) Instrumentation QD1-999 Laser beams Fluid Flow and Transfer Processes filigree structures Process Chemistry and Technology Physics General Engineering Engineering (General). Civil engineering (General) Computer Science Applications aortic stents Chemistry Support removal Line (geometry) TA1-2040 optimization additive manufacturing SS 316L |
| Zdroj: | Applied Sciences, Vol 11, Iss 9176, p 9176 (2021) Applied Sciences Volume 11 Issue 19 |
| ISSN: | 2076-3417 |
| Popis: | One of the fundamental challenges in L-PBF of filigree geometries, such as aortic stents used in biomedical applications, is the requirement for a robust yet easily removable support structure that allows each component to be successfully fabricated without distortion. To solve this challenge, an integrative experimental approach was attempted in the present study by identifying an optimal support structure design and an optimized support removal strategy for this design. The specimens were manufactured using four different support structure designs based on the geometry exposed to the laser beam during the L-PBF. Support removal procedures included sand blasting (SB), glass bead blasting (GB), and electrochemical polishing (ECP). The two best-performing designs (line and cross) were chosen due to shorter lead times and lower material consumption. As an additional factor that indicates a stable design, the breaking load requirement to remove the support structures was determined. A modified line support with a 145° included angle was shown to be the best support structure design in terms of breaking load, material consumption, and manufacturing time. All three procedures were used to ensure residue-free support removal for this modified line support design, with ECP proving to be the most effective. |
| Databáze: | OpenAIRE |
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