On the energy efficiency of pre-heating methods in SLM/SLS processes

On the energy efficiency of pre-heating methods in SLM/SLS processes Selective laser melting/sintering (SLM/SLS) are the most established metallic powder bed additive manufacturing (AM) processes. Pre-heating of the powder and the part in SLM/SLS is performed in order to minimize residual stresses and increase the quality of manufactured parts. However, pre-heating constitutes a large portion, in some cases up to 40%, of the total energy consumed for building a part with SLM/SLS. This paper presents an energy consumption evaluation and comparison of the three existing pre-heating methods in SLM/SLS, which are (i) build chamber pre-heating, (ii) base-plate heating and (iii) laser pre-scanning heating. In order to calculate the energy consumption, transient thermal modeling with the finite element method is performed for all the three methods. The thermal model is applied in the case of the fabrication of a twin cantilever beam made out of titanium alloy Ti6AlV4. In addition, the initial energy required to heat the base plate and the process chamber up to the target temperature are calculated. Results show that laser pre-scanning heating leads to lower heat consumption when it comes to low volume parts, i.e., low part to powder bed volume ratio. For fabricating a higher number of parts or parts of high volume, i.e., high part to powder bed volume ratio, the chamber pre-heating and the base plate pre-heating method are found to be more efficient. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png The International Journal of Advanced Manufacturing Technology Springer Journals

On the energy efficiency of pre-heating methods in SLM/SLS processes

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Publisher
Springer London
Copyright
Copyright © 2017 by Springer-Verlag London Ltd.
Subject
Engineering; Industrial and Production Engineering; Media Management; Mechanical Engineering; Computer-Aided Engineering (CAD, CAE) and Design
ISSN
0268-3768
eISSN
1433-3015
D.O.I.
10.1007/s00170-017-1287-9
Publisher site
See Article on Publisher Site

Abstract

Selective laser melting/sintering (SLM/SLS) are the most established metallic powder bed additive manufacturing (AM) processes. Pre-heating of the powder and the part in SLM/SLS is performed in order to minimize residual stresses and increase the quality of manufactured parts. However, pre-heating constitutes a large portion, in some cases up to 40%, of the total energy consumed for building a part with SLM/SLS. This paper presents an energy consumption evaluation and comparison of the three existing pre-heating methods in SLM/SLS, which are (i) build chamber pre-heating, (ii) base-plate heating and (iii) laser pre-scanning heating. In order to calculate the energy consumption, transient thermal modeling with the finite element method is performed for all the three methods. The thermal model is applied in the case of the fabrication of a twin cantilever beam made out of titanium alloy Ti6AlV4. In addition, the initial energy required to heat the base plate and the process chamber up to the target temperature are calculated. Results show that laser pre-scanning heating leads to lower heat consumption when it comes to low volume parts, i.e., low part to powder bed volume ratio. For fabricating a higher number of parts or parts of high volume, i.e., high part to powder bed volume ratio, the chamber pre-heating and the base plate pre-heating method are found to be more efficient.

Journal

The International Journal of Advanced Manufacturing TechnologySpringer Journals

Published: Nov 9, 2017

References

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