Authors: Bengfort, Philipp
Stracke, Dennis
Künne, Bernd
Title: Establishment of a rotary print head to effect residual stresses and interlayer bonding in an FLM-process
Language (ISO): en
Abstract: 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.
Subject Headings: FLM
Pre-deposition heating
Rotary print head
Additive manufacturing
Residual stress
Interlayer bonding
Subject Headings (RSWK): Fused Deposition Modeling
Druckwerk <Technik>
Rapid Prototyping <Fertigung>
Mechanische Beanspruchung
Issue Date: 2021-07-27
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Appears in Collections:Fachgebiet Maschinenelemente

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