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Optimisation of Process Parameters for Lattice Structures

Abele, Eberhard ; Stoffregen, Hanns ; Klimkeit, Klaus ; Hoche, Holger ; Oechsner, Matthias :
Optimisation of Process Parameters for Lattice Structures.
[Online-Edition: http://dx.doi.org/10.1108/RPJ-10-2012-0096]
In: Rapid Prototyping Journal, Emerald Group Publishing Limited, United Kingdom, 21 (1) pp. 117-127. ISSN 1355-2546
[Artikel], (2015)

Offizielle URL: http://dx.doi.org/10.1108/RPJ-10-2012-0096

Kurzbeschreibung (Abstract)

Purpose – This paper aims to develop a set of process parameters tailored for lattice structures and test them against standard process (SP) parameters. Selective laser melting (SLM) is a commonly known and established additive manufacturing technique and is a key technology in generating intricately shaped lattice structures. However, SP parameters used in this technology have building time and accuracy disadvantages for structures with a low area-to-perimeter ratio, such as thin struts. Design/methodology/approach – In this research work, body-centred cubic structure specimens are manufactured using adapted process parameters. Central to the adapted process parameters is the positioning of the laser beam, the scan strategy and the linear energy density. The specimens are analysed with X-ray micro-computed tomography for dimensional accuracy. The final assessment is a comparison between specimens manufactured using adapted process parameters and those using SP parameters. Findings – Standard parameters for lattice structures lead to a significant shift from the nominal geometry. An extensive manufacturing and computation time due to several exposure patterns (e.g. pre-contours, post-contours) was observed. The tailored process parameters developed had good dimensional accuracy, reproducible results and improved manufacturing performance. Research limitations/implications – The results are based on a distinctive geometry of the lattice structure and a specific material. Future research should be extended to other geometries and materials. Practical implications – Optimisation of process parameters for the part geometry is a critical factor in improving dimensional accuracy and performance of SLM processes. Originality/value – This study demonstrates how application-tailored process parameters can lead to superior performance and improved dimensional accuracy. The results can be transferred to other lattice structure designs and materials.

Typ des Eintrags: Artikel
Erschienen: 2015
Autor(en): Abele, Eberhard ; Stoffregen, Hanns ; Klimkeit, Klaus ; Hoche, Holger ; Oechsner, Matthias
Titel: Optimisation of Process Parameters for Lattice Structures
Sprache: Englisch
Kurzbeschreibung (Abstract):

Purpose – This paper aims to develop a set of process parameters tailored for lattice structures and test them against standard process (SP) parameters. Selective laser melting (SLM) is a commonly known and established additive manufacturing technique and is a key technology in generating intricately shaped lattice structures. However, SP parameters used in this technology have building time and accuracy disadvantages for structures with a low area-to-perimeter ratio, such as thin struts. Design/methodology/approach – In this research work, body-centred cubic structure specimens are manufactured using adapted process parameters. Central to the adapted process parameters is the positioning of the laser beam, the scan strategy and the linear energy density. The specimens are analysed with X-ray micro-computed tomography for dimensional accuracy. The final assessment is a comparison between specimens manufactured using adapted process parameters and those using SP parameters. Findings – Standard parameters for lattice structures lead to a significant shift from the nominal geometry. An extensive manufacturing and computation time due to several exposure patterns (e.g. pre-contours, post-contours) was observed. The tailored process parameters developed had good dimensional accuracy, reproducible results and improved manufacturing performance. Research limitations/implications – The results are based on a distinctive geometry of the lattice structure and a specific material. Future research should be extended to other geometries and materials. Practical implications – Optimisation of process parameters for the part geometry is a critical factor in improving dimensional accuracy and performance of SLM processes. Originality/value – This study demonstrates how application-tailored process parameters can lead to superior performance and improved dimensional accuracy. The results can be transferred to other lattice structure designs and materials.

Titel der Zeitschrift, Zeitung oder Schriftenreihe: Rapid Prototyping Journal, Emerald Group Publishing Limited, United Kingdom
Band: 21
(Heft-)Nummer: 1
Freie Schlagworte: Additive manufacturing, Lattice structures, Micro-computed tomography, Process parameters, Selective laser melting
Fachbereich(e)/-gebiet(e): Fachbereich Maschinenbau > Werkstoffkunde
Fachbereich Maschinenbau > Produktionsmanagement, Technologie und Werkzeugmaschinen
Fachbereich Maschinenbau
Hinterlegungsdatum: 21 Jan 2015 08:13
Offizielle URL: http://dx.doi.org/10.1108/RPJ-10-2012-0096
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