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Energy Efficiency

, Volume 11, Issue 5, pp 1227–1245 | Cite as

Energy savings through additive manufacturing: an analysis of selective laser sintering for automotive and aircraft components

Original Article
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Abstract

The general consensus is that 3D-printing technologies can help to render industrial production more sustainable, e.g. by shortening process chains, allowing more efficient production processes or providing benefits resulting from light-weight construction. This paper aims to quantify the impact of additive manufacturing processes on energy demand by examining selective laser sintering (SLS). To this end, a model is suggested and applied that focuses on three important phases in the life cycle of additively manufactured components and that allows a comparison with conventional manufacturing processes. The three phases considered are the production of the required raw material, the actual manufacturing process of specific components and their utilisation. The analysis focuses on the automotive and aircraft industries. The main factors influencing energy demand are analysed and discussed, and the impact of additive manufacturing is estimated on a national level for a sample component based on Germany as an example. The results indicate that substantial energy savings can be achieved, even though only a small component was replaced.

Keywords

Additive manufacturing Energy demand model Life cycle analysis Impact assessment Selective laser sintering 

Nomenclature

Production of pre-products

e1

specific energy demand for EAF metal smelting and refining [MJ/kg]

e2

specific energy demand for smelting process [MJ/kg]

e3

specific energy demand for casting and processing [MJ/kg]

e4, gas

specific energy demand for the (gas) atomising process [MJ/kg]

Ti

material-specific temperature difference [K]

ci

material-specific heat capacity [MJ/(kg·K)]

δi

specific smelting enthalpy [MJ/kg]

α

mark-up factor for real-world demand [no dimension]

esub

specific energy demand for the conventional production route [MJ/kg]

edir

specific energy demand for the direct additive route [MJ/kg]

eind

specific energy demand for the indirect additive route [MJ/kg]

Fabrication of components

psub

power demand per metal removal [MJ/mm3]

Vblk

volume of metal block for conventional processes [mm3]

Vcom

volume of the target component [mm3]

hcom

height of the component [mm]

hlay

thickness of an additively manufactured layer [mm]

β

mark-up factor for adjusting to real-world building rate [no dimension]

radd

material specific volume building rate [mm3/s]

Padd

power demand for system operation [W]

tlay

time for mechanical movements per layer (lifting table, powder distribution) [s]

tmec

total time for mechanical movements of lifting table and powder distribution [s]

tcon

time for building the component [s]

Eadd

energy demand for a specific component using additive processes [J]

Esub

energy demand for a specific component using conventional processes [J]

Utilisation of the products

acon

annual energy demand for product usage [J/a]

γ

average product life span [a]

θ

pre-factor for alterations in product shape impacting on energy demand [no dimension]

Δg

weight difference of additively and conventionally manufactured products [g]

Asub

energy demand in utilisation of conventionally produced final product [J]

Aadd

energy demand in utilisation of an additively produced final product [J]

awgt

annual energy savings per unit of weight [J/(a·g)]

Notes

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© Springer Science+Business Media B.V., part of Springer Nature 2018

Authors and Affiliations

  • Tim Hettesheimer
    • 1
  • Simon Hirzel
    • 1
  • Han Byeol Roß
    • 1
  1. 1.Fraunhofer Institute for Systems and Innovation Research ISIKarlsruheGermany

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