Impact of UV curing process on mechanical properties and dimensional accuracies of digital light processing 3D printed objects

다국어 초록 (Multilingual Abstract)

In the last decade, there has been an exponential increase of scientific interest in smart additive manufacturing (AM) technology. Among the different AM techniques, one of the most commonly applied processes is digital light processing (DLP). DLP uses a digital projector screen to flash an ultraviolet light which cures photopolymer resins. The resin is cured to form a solid to produce parts with precise high dimensional accuracy. During the curing process, there are several process parameters that need to be optimized. Among these, the exposure time affects the quality of the 3D printed specimen such as mechanical strength and dimensional accuracy. This study examines optimal exposure times and their impact on printed part. It was found that there is optimal exposure time for printed part to have appropriate mechanical strength and accurate dimensions. The gel fraction and TGA test results confirmed that the improvement of mechanical properties with the increasing UV exposure time was due to the increase of crosslinked network formation with UV exposure time in acrylic resins. In addition, gel fraction and thermogravimetric analysis were employed to microscopically investigate how this process parameter impacts mechanical performance.

참고문헌 (Reference)

1 Park, Y.J., "UV-and thermal -curing behaviors of dual curing behaviors of dual-curable adhesives based on epoxy acrylate oligomers" 29 (29): 710-717, 2009

2 Gowda, R.B., "Studies on the process parameters of rapid prototyping technique (Stereolithography) for the betterment of part quality" 1-11, 2014

3 Beaman, J.J., "Solid freeform fabrication: An historical perspective" 584-595, 2001

4 Sun, C., "Projection micro-stereolithography using digital micro-mirror dynamic mask" 121 : 113-120, 2005

5 Peterson, G.I., "Production of materials with spatially-controlled cross-link density via vat Photopolymerization" 8 (8): 29037-29043, 2016

6 Chiu, S.H., "Process parameters optimization for area-forming rapid prototyping system" 21 : 70-78, 2015

7 Ciraud, P.A., "Process and device for the manufacture of any objects desired from any metable materials, FRG Disclosure Publications, 2263777" 1972

8 Ibrahim, A., "Optimization of process parameter for digital light processing (DLP) 3D printing" 11-14, 2017

9 Hague, R., "Materials analysis of stereolithography resins for use in Rapid Manufacturing" 39 : 2457-2464, 2004

10 Xu, K., "Mask image planning for deformation control in projection-based stereolithography process" 2015

11 Schultz, U., "Graded coatings for thermal, wear and corrosion barriers" 362 (362): 61-80, 2003

12 Muller, E., "Functionally graded materials for sensor and energy applications" 362 (362): 17-39, 2003

13 Pompe, W., "Functionally graded materials for biomedical applications" 362 (362): 40-60, 2003

14 Xia, C., "Fully three-dimensional microfabrication with a grayscale polymeric self-sacrificial structure" 19 : 115029-, 2009

15 Mott, E.J., "Digital micromirror device (DMD)-based 3D printing of poly (propylene fumarate) scaffolds" 61 : 301-311, 2016

16 Zhou, C., "Digital material fabrication using mask-image-projection-based stereolithography" 19 (19): 153-165, 2013

17 Chih-Ping Wu, "Coupled electro-elastic analysis of functionally graded piezoelectric material plates" 국제구조공학회 16 (16): 781-806, 2015

18 Huang, Y.M., "Compensation of distortion in the bottom exposure of Stereolithography process" 27 (27): 1101-1112, 2006

19 Hull, C.W., "Apparatus for production of three dimensional objects by stereolithography, U.S patent, 4575330 A"

20 Lazreg Hadji, "Analysis of functionally graded plates using a sinusoidal shear deformation theory" 국제구조공학회 19 (19): 441-448, 2017

21 Jin, G.Q., "Adaptive rapid prototyping/manufacturing for functionally graded materialbased biomedical models" 65 (65): 97-113, 2013

22 Gun, M., "Acrylic nanocomposite resins for use in stereolithographyand structural light modulation based rapid prototypingand rapid manufacturing technologies" 18 : 2390-2397, 2008

23 Mansour, S., "A study of the impact of short-term ageing on the mechanical properties of a stereolithography resin" 447 : 277-284, 2007

24 Gaetano Giunta, "A dynamic analysis of three-dimensional functionally graded beams by hierarchical models" 국제구조공학회 13 (13): 637-657, 2014