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Article
Publication date: 19 January 2015

Eberhard Abele, Hanns A. Stoffregen, Klaus Klimkeit, Holger Hoche and Matthias Oechsner

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…

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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.

Details

Rapid Prototyping Journal, vol. 21 no. 1
Type: Research Article
ISSN: 1355-2546

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Article
Publication date: 10 May 2013

Farid Mokhtar Noriega, Stephen Heppell, Nieves Segovia Bonet and Julliette Heppell

The purpose of this paper is to describe the relevant role of users/learners as designers/creators of meaningful and effective learning places and spaces in both digital and

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Abstract

Purpose

The purpose of this paper is to describe the relevant role of users/learners as designers/creators of meaningful and effective learning places and spaces in both digital and virtual worlds.

Design/methodology/approach

The paper is based on research and observation of changing trends in users' behavior in physical and digital collaborative workplaces and spaces all over the world.

Findings

In this third millennium, the new spirit of knowmadic workers and learners is breaking down old design concepts and rules. The progressively more subtle frontier between virtual and physical learning environments and working environments is changing the use by, and the behavior of, learners in these places and spaces. In this context, the transversal‐thinking, designer‐guided paradigm is rendered effectively useless. The era of user‐led design has started. User‐oriented design is an old trend; it has changed over time. In societies and economies based on learning, reflection and constant collaboration, the individualistic design guru has no place.

Originality/value

This paper discusses the evolving strategic role of users/learners as designers and co‐creators of their own places. Traditional design criteria and theories are outdated. The role of the designer as master/creator is not compatible with the collegiate and collaborative, reflective spirit of knowmadic learners. A consequence is a requirement for new strategies and a redefinition of the designer's role in the creation of space. The axis of design control has shifted.

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