Journal of the Korean Society of Manufacturing Process Engineers (한국기계가공학회지)

The Korean Society of Manufacturing Process Engineers (한국기계가공학회)
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Investigation of the Internal Stress Relaxation in FDM 3D Printing : vegetable lubricating oil

FDM 3D프린팅 윤활유에 따른 내부응력 완화에 관한 연구

  • Lee, Sun Kon (Department of Mechanical Engineering, Inha University) ;
  • Kim, Yong Rae (Department of Mechanical Engineering, Inha University) ;
  • Kim, Su Hyun (Department of Mechanical Engineering, Inha University) ;
  • Kang, Sun Ho (Department of Mechanical Engineering, Inha University) ;
  • Kim, Joo Hyung (Department of Mechanical Engineering, Inha University)
  • Received : 2018.09.13
  • Accepted : 2019.01.04
  • Published : 2019.02.28
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Abstract

In this paper, the effects of different 3D printing conditions including oil lubrication and annealing are observed for their effects on tensile testing. In 3D printing, a press-out extrude filament is rapidly heated and cooled to create internal stress in the printed part. The 3D printing internal stress can be removed using oil-coated filament and annealing. During the oven cooling at an annealing temperature of $106^{\circ}C$, the stress of the specimens with laminated angle $0^{\circ}$ tends to increase by 12.6%, and that of the oil-coated filament printing specimens is increased by 17%. At the annealing temperature of $106^{\circ}C$, the stress of the oil-coated filament printing specimens tends to increase by 35%. In this study, we have found that the oil lubrication and annealing remove the internal stresses and increase the strength of the printed specimens. The oil lubrication and annealing reform the crystalline structures to even out the areas of high and low stress, which creates fewer fragile areas. These results are very useful for the manufacture of 3D printing products with a suitable mechanical strength for applications.

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References

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