Smith, C.J., Derguti, F., Hernandez Nava, E. et al. (5 more authors) (2016) Dimensional accuracy of Electron Beam Melting (EBM) additive manufacture with regard to weight optimized truss structures. Journal of Materials Processing Technology, 229. pp. 128-138. ISSN 0924-0136
Abstract
The Electron Beam (EBM) additive manufacturing process is well suited to fabricating complex structural designs in Ti–6Al–4V because of the design freedoms it offers combined with strong and consistent material properties. However it has been observed that complications may arise when manufacturing truss-like structures (such as those produced via structural topology optimization) in the form of undersized features on the finished part. The issue appears to affect truss members that are not aligned with the vertical build direction, with an apparent lack of material on the negative surfaces. This effect appears to worsen with a greater angle between the truss member and the build direction, even with the use of support structures. This investigation has characterized and measured the dimensional errors that result from this issue through 3D scanning techniques. Process modifications have then been made which result in significant improvements in dimensional accuracy. This investigation highlights the importance of heat management at features with negative surfaces to yield parts that are dimensionally accurate without introducing excessive internal melt defects in the form of voids and porosity.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2015 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). |
Keywords: | Laser scanning; X-ray tomography; Titanium; Arcam; Topology optimization; Truss structures |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Materials Science and Engineering (Sheffield) |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 02 Nov 2016 10:34 |
Last Modified: | 02 Nov 2016 10:38 |
Published Version: | https:/dx.doi.org/10.1016/j.jmatprotec.2015.08.028 |
Status: | Published |
Publisher: | Elsevier |
Refereed: | Yes |
Identification Number: | 10.1016/j.jmatprotec.2015.08.028 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:106401 |