The effect of hatch angle rotation on parts manufactured using selective laser melting



Robinson, Joseph Henry, Ashton, Ian Robert Thomas ORCID: 0000-0002-0449-2415, Jones, Eric, Fox, Peter ORCID: 0000-0003-3442-8630 and Sutcliffe, Chris
(2019) The effect of hatch angle rotation on parts manufactured using selective laser melting. RAPID PROTOTYPING JOURNAL, 25 (2). pp. 289-298.

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Abstract

<jats:sec><jats:title content-type="abstract-subheading">Purpose</jats:title> <jats:p>This paper aims to present an investigation into the variation of scan vector hatch rotation strategies in selective laser melting (SLM), focussing on how it effects density, surface roughness, tensile strength and residual stress.</jats:p> </jats:sec> <jats:sec><jats:title content-type="abstract-subheading">Design/methodology/approach</jats:title> <jats:p>First the optimum angle of hatch vector rotation is proposed by analysing the effect of different increment angles on distribution of scan vectors. Sectioning methods are then used to determine the effect that the chosen strategies have on the density of the parts. The top surface roughness was analysed using optical metrology, and the tensile properties were determined using uni-axial tensile testing. Finally, a novel multi-support deflection geometry was used to quantify the effects of rotation angles on residual stress.</jats:p> </jats:sec> <jats:sec><jats:title content-type="abstract-subheading">Findings</jats:title> <jats:p>The results of this research showed that the hatch rotation angle had little effect on the density, top surface roughness and strength of the parts. The greatest residual stress deflection was measured parallel to unidirectional scan vectors. The use of hatch rotations other than alternating 90° showed little benefit in lowering the magnitude of residual stresses. However, the use of rotation angles with a good suitability measure distributes stresses in all directions more evenly for certain part geometries.</jats:p> </jats:sec> <jats:sec><jats:title content-type="abstract-subheading">Research limitations/implications</jats:title> <jats:p>All samples produced in this work were made from commercially pure titanium, therefore care must be taken when applying these results to other materials.</jats:p> </jats:sec> <jats:sec><jats:title content-type="abstract-subheading">Originality/value</jats:title> <jats:p>This paper serves to increase the understanding of SLM scanning strategies and their effect on the properties of the material.</jats:p> </jats:sec>

Item Type: Article
Uncontrolled Keywords: Surface roughness, Tensile strength, Residual stress, Density, Selective laser melting, Hatch rotation
Depositing User: Symplectic Admin
Date Deposited: 13 Jun 2018 08:43
Last Modified: 19 Jan 2023 06:48
DOI: 10.1108/RPJ-06-2017-0111
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3014133