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Title |
Uniformity and Accuracy of Mortar Layer Thickness for the Quality Evaluation of 3D Printer Output
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Authors |
서지석(Ji-Seok Seo) ; 이봉춘(Bong-Chun Lee) ; 김윤용(Yun-Yong Kim) |
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DOI |
https://doi.org/10.4334/JKCI.2020.32.4.371 |
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Keywords |
3D 프린터; 흐름성; 간극비; 적층성; 두께 균일성 3D printer; flowability; void ratio; buildability; layer uniformity |
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Abstract |
This study presents a method for evaluating the output quality of 3D printing mortar through layer thickness, and analyzed the effect of mortar flowability and void-ratio on uniformity and accuracy of layer thickness. As a result of observing the appearance of the 3D printer output specimen, the difference in the width of the upper layer and the lower layer of the specimen increased as the flowability and void ratio increased. It was also observed that the surface of the specimens became rough as the flowability and void ratio decreased. Using image analysis, the layer thickness was measured in units of pixels; the layer quality properties were analyzed using the proposed equation. The X-axis and Z-axis uniformity values of the layer thickness were in ranges of 0.79 to 0.98 and 0.75 to 0.83, respectively. The uniformity increased as the flowability and void ratio increased, while uniformity decreased with increase of flowability and void ratio after reaching maximum uniformity. The flowability and void ratio of the mortar showing maximum uniformity are 1.89 and 0.70, respectively. The accuracy of the layer thickness was in a range of 0.86 to 0.94, and showed the same tendency as the uniformity with respect to flowability and void ratio. The mortar showing the maximum uniformity exhibited a maximum accuracy of 0.94.
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