Clean Technology (청정기술)

The Korean Society of Clean Technology (한국청정기술학회)
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Improvement of the Surface Roughness of a 3D Stereolithographic Part for a Molded Interconnect Device

  • Jeong Beom Ko (Korea Institute of Industrial Technology) ;
  • Hyeon Beom Kim (Korea Institute of Industrial Technology) ;
  • Young Jin Yang (Korea Institute of Industrial Technology)
  • Received : 2024.07.25
  • Accepted : 2024.08.07
  • Published : 2024.09.30
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Abstract

3D printing technology has created a paradigm shift in industries by achieving breakthrough innovations and enabling the fabrication of complex products. However, 3D printed parts are inferior in terms of their strength and surface quality compared to parts fabricated by conventional manufacturing methods. This study aims to improve the surface roughness of stereolithographic parts by experimental analysis of the generated area error. A photocurable polymer material was used for fabrication, and the effect of important parameters, such as the material viscosity, printing speed, pneumatic pressure, UV intensity, and pattern spacing, on the surface roughness were analyzed. The results showed that a high-viscosity (12,000 cP) thixotropic material formed a constant pattern with an aspect ratio of 1:1, and the pattern shape was maintained after printing. A pattern with a minimum thickness of 145 ㎛ was formed at a printing speed of 70 mm/s and a pneumatic pressure of 20 kPa. These parameters were found to be suitable for low surface roughness. A UV laser at an intensity of 10 ~ 30 mW/cm2 was used to form a smooth surface at low curing intensities. Moreover, it was seen that with a pattern spacing of 110 ~ 130 ㎛, a stereolithographic part with a low surface roughness of Ra 1.29 ㎛ could be fabricated.

Keywords

Acknowledgement

This study has been conducted with the support of the Korea Institute of Industrial Technology as "Development of elemental technology for implementing next-generation freeform display based on arbitrary surfaces (kitech UR-24-0027)."

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