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Study on Geometry, Dimensional Accuracy and Structure of Parts Produced by Multi Jet Fusion.

Martyna Adach1, Paweł Sokołowski2, Tomasz Piwowarczyk2

  • 13D Center Sp. z o.o., Kwiatkowskiego 4, 52-407 Wroclaw, Poland.

Materials (Basel, Switzerland)
|August 27, 2021
PubMed
Summary

Multi Jet Fusion (MJF) technology enables printing complex polymer parts with high resolution. However, optimizing for dimensional accuracy can lead to microstructural defects like porosity in PA12 prints.

Keywords:
additive manufacturingbuild orientationgeometrical accuracymicrostructuremulti jet fusion

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Area of Science:

  • Additive Manufacturing
  • Materials Science
  • Polymer Engineering

Background:

  • Multi Jet Fusion (MJF) is an advanced additive manufacturing technology for polymers.
  • MJF offers fast printing, short cycles, and high resolution, attracting industrial interest.
  • The technology's capability for complex geometries is under continuous investigation.

Purpose of the Study:

  • To analyze the geometry, dimensional accuracy, and fracture characteristics of thin-walled spherical PA12 parts produced via MJF.
  • To evaluate the impact of print orientation and thickness on MJF part quality.
  • To identify trade-offs between achieving high dimensional accuracy and potential microstructural defects.

Main Methods:

  • Fabrication of twelve thin-walled spherical PA12 specimens using Multi Jet Fusion.
  • Systematic variation of print orientations and part thicknesses (1, 2, and 3 mm).
  • Detailed analysis of geometric fidelity, dimensional accuracy, and fracture surface morphology.

Main Results:

  • MJF technology successfully produced complex, thin-walled spherical shapes.
  • Print parameters optimized for dimensional accuracy correlated with increased interlayer porosity.
  • A high number of non-processed powder particles were observed within the printed structures.
  • Print orientation and thickness influenced geometric and dimensional outcomes.

Conclusions:

  • Multi Jet Fusion can fabricate intricate polymer geometries with high resolution.
  • Achieving optimal dimensional accuracy in MJF parts may compromise microstructural integrity.
  • Further research is needed to mitigate defects like porosity and entrapped powder for enhanced material performance.