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Investigations on Roller-Based Filament Drives

Nienhaus, Vinzenz ; Spiehl, Dieter ; Dörsam, Edgar (2021):
Investigations on Roller-Based Filament Drives. (Publisher's Version)
In: Journal of Manufacturing and Materials Processing, 5 (2), MDPI, e-ISSN 2504-4494,
DOI: 10.26083/tuprints-00019382,
[Article]

Abstract

The filament drive is a key part of the extrusion assembly of a Fused Filament Fabrication printer. This investigation examines the maximum feed force and the slip of different driving rollers using a filament made of polylactic-acid (PLA) on a test stand. The test stand systematically varies the main feed process parameters: feed velocity, pinch force between the rollers, and feed force. The maximum feed force has a characteristic dependency on the pinch force combined with a feedvelocity- dependency, which is influenced by the outer diameter of the driving roller. The slip was found to increase linearly with the feed force. The slip decreases with increasing pinch force and is nearly constant for pinch forces above 77 N—172 N, depending on the driving roller tooth geometry and outer diameter. A model derived from contact mechanics was used for phenomenological modeling of the slip in relation to pinch force and feed velocity. An exponential ansatz provided good modeling of the slip at a constant pinch force. The model of the slip combined with the extrusion forces in the liquefier can be used to estimate the material flow in the future, thus leading to increased precision of the parts in a magnitude of systems.

Item Type: Article
Erschienen: 2021
Creators: Nienhaus, Vinzenz ; Spiehl, Dieter ; Dörsam, Edgar
Origin: Secondary publication via sponsored Golden Open Access
Status: Publisher's Version
Title: Investigations on Roller-Based Filament Drives
Language: English
Abstract:

The filament drive is a key part of the extrusion assembly of a Fused Filament Fabrication printer. This investigation examines the maximum feed force and the slip of different driving rollers using a filament made of polylactic-acid (PLA) on a test stand. The test stand systematically varies the main feed process parameters: feed velocity, pinch force between the rollers, and feed force. The maximum feed force has a characteristic dependency on the pinch force combined with a feedvelocity- dependency, which is influenced by the outer diameter of the driving roller. The slip was found to increase linearly with the feed force. The slip decreases with increasing pinch force and is nearly constant for pinch forces above 77 N—172 N, depending on the driving roller tooth geometry and outer diameter. A model derived from contact mechanics was used for phenomenological modeling of the slip in relation to pinch force and feed velocity. An exponential ansatz provided good modeling of the slip at a constant pinch force. The model of the slip combined with the extrusion forces in the liquefier can be used to estimate the material flow in the future, thus leading to increased precision of the parts in a magnitude of systems.

Journal or Publication Title: Journal of Manufacturing and Materials Processing
Journal volume: 5
Number: 2
Publisher: MDPI
Collation: 15 Seiten
Divisions: 16 Department of Mechanical Engineering
16 Department of Mechanical Engineering > Institute of Printing Science and Technology (IDD)
Date Deposited: 30 Aug 2021 12:06
DOI: 10.26083/tuprints-00019382
Official URL: https://tuprints.ulb.tu-darmstadt.de/19382
URN: urn:nbn:de:tuda-tuprints-193827
Additional Information:

Keywords: fused filament fabrication; fused depositionmodeling; filament; filament drive; extruder; PLA

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