FDM방식 3D프린팅 출력물의 표면 개선 후 강도 평가

Abstract

In the 3D printing technologyies, FDM 3D printers have a high proportion in the world. However, it is less useful because of the strength and surface roughness of the printed product. As a way to improve the strength of the FDM 3D printer output, the surface is improved by applying acetone or fumigation on the surface of the output.

In this study, the surface of 3D printer output was evaluated as the main focus with the comparison of before and after surface improvement and strength improvement using hot air heat source. In addition, filling analysis, pressure analysis, cooling analysis, and deformation analysis were performed with injection molding analysis.

it is confirmed that the deformation of the 3D printer output is less than 1% in 165mm of the design data value being 0.3% of the PLA output and 0.6% of the ABS output. Also, it is proved that injection molding analysis showed a difference of 0.3% to 0.1% between 3D printer output with 0.5% ABS output and injection molding analysis with 0.6% PLA output.

When exposed with 150mm distance between nozzle and output at 200°C of heat treatment for 15 seconds, the value of the product deformation was less than 1%. There were no changes in dimensions and surfaces at 100°C to 150°C, however, the output started to be twisted and bent at 250°C to 300°C.

The average tensile strength value before heat treatment of PLA output was 9.67 N/㎟, and the average tensile strength value after heat treatment was 24.17 N/㎟, which improved tensile strength by 14.5/㎟. The average tensile strength value before heat treatment of the ABS output was 8.36 N/㎟, and the average tensile strength value after heat treatment was 19.11 N/㎟, indicating that the tensile strength was improved by 10.75/㎟.