Laser Polishing of Selective Laser Melted Components_Accepted.pdf (555.82 kB)

Laser polishing of selective laser melted components

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journal contribution
posted on 10.07.2015, 11:00 by Sundar Marimuthu, A. Triantaphyllou, M. Antar, D.I. Wimpenny, H. Morton, M. Beard
The shape complexities of aerospace components are continuously increasing, which encourages industries to refine their manufacturing processes. Among such processes, the selective laser melting (SLM) process is becoming an economical and energy efficient alternative to conventional manufacturing processes. However, dependant on the component shape, the high surface roughness observed with SLM parts can affect the surface integrity and geometric tolerances of the manufactured components. To account for this, laser polishing of SLM components is emerging as a viable process to achieve high-quality surfaces. This report details an investigation carried out to understand the basic fundamentals of continuous wave laser polishing of SLM samples. A numerical model, based on a computational fluid dynamic formulation, was used to assist the understanding of melt pool dynamics, which significantly controls the final surface roughness. The investigation identified the input thermal energy as the key parameter that significantly affect the melt pool convection, and essentially controls the surface quality. Minimum meltpool velocity is essential to achieve wider laser polished track width with good surface finish. Experimental results showed a reduction of surface roughness from 10.2 μm to 2.4 μm after laser polishing with optimised parameters. Strategies to control the surface topology during laser polishing of SLM components are discussed.

Funding

The authors acknowledge the financial support of the work by the Technology Strategy Board (TSB) under the IMPULSE grant.

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Published in

International Journal of Machine Tools and Manufacture

Citation

MARIMUTHU, S. et al., 2015. Laser polishing of selective laser melted components. International Journal of Machine Tools and Manufacture, 95, pp. 97-104.

Publisher

© Elsevier

Version

AM (Accepted Manuscript)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Publication date

2015

Language

en

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