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Surface texture measurement for additive manufacturing.

Triantaphyllou, A*; Giusca, C L; Macaulay, G D; Roerig, F*; Hoebel, M*; Leach, R K*; Tomita, B*; Milne, K A* (2015) Surface texture measurement for additive manufacturing. Surf. Topogr.: Metrol. Prop., 3 (2). 024002

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The surface texture of additively manufactured metallic surfaces is affected by a number of factors, including the powder size distribution, the effect of the heat source, the thickness of the printed layers, the angle of the surface relative to the horizontal build bed and the effect of any post processing/finishing. The aim of the research reported here is to understand the way additive manufactured surfaces should be measured in order to characterise them. In published research to date, the surface texture is generally reported as an Ra value, measured across the lay. The appropriateness of this method for such surfaces is investigated here. A preliminary investigation was carried out on two additive manufacturing processes - Selective Laser Melting (SLM) and Electron Beam Melting (EBM) - focusing on the effect of build angle and post processing. The surfaces were characterised using both tactile and optical methods and a range of profile and areal parameters were reported. Test coupons were manufactured at four angles relative to the horizontal plane of the powder bed using both SLM and EBM. The measured value of the Ra parameter for each of the build angles was compared to values obtained from other profile and areal measurement parameters. The effect of lay - caused by the layered nature of the manufacturing process - was investigated as was the required sample area for optical measurements. The surfaces were also measured before and after grit blasting.

Item Type: Article
Subjects: Engineering Measurements
Engineering Measurements > Dimensional
Identification number/DOI: 10.1088/2051-672X/3/2/024002
Last Modified: 02 Feb 2018 13:13
URI: http://eprintspublications.npl.co.uk/id/eprint/6706

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