Impact of print bed build location on the dimensional accuracy and surface quality of parts printed by multi jet fusion

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Title: Impact of print bed build location on the dimensional accuracy and surface quality of parts printed by multi jet fusion
Authors: Sagbas, BinnurGümüş, Beril EkerKahraman, YusufDowling, Denis P.
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Date: Oct-2021
Online since: 2022-01-19T13:27:17Z
Abstract: Multi Jet Fusion (MJF) is one of the newly developed additive manufacturing techniques, based on the use of powder bed fusion technology. It provides the opportunity to build up 3D, complex polymer geometries, without the need for support structures. This study evaluates the effect of build location across a 380 × 284 mm2 build plate, on both the dimensional accuracy and surface quality of polyamide 12 (PA12) parts printed using the MJF technique. The cube test samples were printed at each of the four corners and the center of the build plate. Dimensional deviations were determined using optical metrology measurements, while surface deviations were measured using 2D tactile and 3D optical profilometers. The density and the degree of crystallinity of the samples were determined using the Archimedes method and Differential Scanning Calorimetry analysis, respectively. Moreover, the morphology of the internal polymer surfaces was evaluated using Scanning Electron Microscopy. It was concluded that while overall printed part dimensions and crystallinity homogeneity were relatively uniform across the build plate, some variations were observed. Parts printed in particular, closer to the front of the build plate exhibited higher porosity, higher surface roughness along with the highest level of geometry deviation, compared with the CAD drawing. This is likely to be associated with some non- uniformities in heating and cooling of the PA12 polymer parts across the build plate.
Funding Details: Science Foundation Ireland
Funding Details: I-Form Advanced Manufacturing Research Centre
Type of material: Journal Article
Publisher: Elsevier
Journal: Journal of Manufacturing Processes
Volume: 70
Start page: 290
End page: 299
Copyright (published version): 2021 The Society of Manufacturing Engineers.
Keywords: Additive manufacturingMulti jet fusionPA12Powder bed fusionDimensional accuracy
DOI: 10.1016/j.jmapro.2021.08.036
Language: en
Status of Item: Peer reviewed
This item is made available under a Creative Commons License:
Appears in Collections:Mechanical & Materials Engineering Research Collection
I-Form Research Collection

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