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A more accurate analytical formulation of surface roughness in layer-based additive manufacturing to enhance the product’s precision

Abstract

A theoretical formula for surface roughness of layer-based manufactured parts in additive manufacturing is developed considering a more accurate definition of the centerline by minimizing the total arithmetic deviations of the actual surface profile. The developed model is experimentally validated, and it is compared with those that are used in common practices. Considering the uncontrolled process variables and the complexity of the numerical solutions, the analytical and experimental results show satisfying agreement. A methodology is also developed to decide whether the objective surface slope is feasible with the current number of layers and how the layers need to be laid down to achieve the desired surface accuracy. The methodology yields more accurate small features on the surfaces of the layer-based manufactured products.

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Acknowledgements

The research support provided by the Natural Science and Engineering Research Council of Canada (NSERC) is greatly appreciated.

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Correspondence to Ahmad Barari.

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Lalehpour, A., Barari, A. A more accurate analytical formulation of surface roughness in layer-based additive manufacturing to enhance the product’s precision. Int J Adv Manuf Technol 96, 3793–3804 (2018). https://doi.org/10.1007/s00170-017-1448-x

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Keywords

  • Layer-based manufacturing
  • Additive manufacturing
  • Surface roughness
  • Least square method
  • Centerline
  • Total least square, 3D printing, surface metrology