Establishment of a rotary print head to effect residual stresses and interlayer bonding in an FLM-process
| Autor: | Philipp Bengfort, Dennis Stracke, Bernd Künne |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | Journal of Manufacturing and Materials Processing Volume 5 Issue 3 Journal of Manufacturing and Materials Processing, Vol 5, Iss 82, p 82 (2021) |
| Popis: | n fused layer modeling (FLM) manufacturing technology, there is an increased demand for semi-crystalline materials due to their favorable mechanical properties, such as high strength and toughness. The reasons for their limited use are process-related residual stresses and reduced interlayer bonding, resulting in component distortion, warping and poor strength. Addressing these problems, this paper presents the development and implementation of a rotary print head that enables local laser pre-deposition heating and forced air cooling in the 2.5-dimensional FLM process. Samples of polypropylene are fabricated to investigate the effects of the modified process on residual stresses and interlayer bonding. The investigations show that local laser pre-deposition heating can positively influence the interlayer bonding. In combination with a reduction of the extrusion temperature and additional cooling, it is possible to considerably reduce the residual stresses. The results of this research show that pre-deposition heating and forced air cooling significantly improve the processability of semi-crystalline thermoplastics in the FLM process. Journal of manufacturing and materials processing;Vol. 5. 2021, 3, art. 82 |
| Databáze: | OpenAIRE |
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