Experimental investigation of 3D printed component with integrated pressing tool

• 第一著者: Majid, Siti Najatul Aishah
• フォーマット: 学位論文
• 言語: 英語; 英語
• 出版事項: 2021
• 主題: T Technology (General); TS Manufactures
• オンライン･アクセス: http://eprints.utem.edu.my/id/eprint/25988/; https://plh.utem.edu.my/cgi-bin/koha/opac-detail.pl?biblionumber=121201

Additive manufacturing or 3D printing is a technology that built up the object layer-by-layer from computer aided design (CAD) where a thinly sliced horizontal can be seen from the eventual object. This thin line segment produces the printed part with less superior of physical properties such as low in tensile strength, high in porosity percentage and poor surface roughness especially for the open source 3D printer compared to the commercial 3D printers. Therefore, this study investigates the physical behavior of the printed part of the acrylonitrile butadiene styrene (ABS) material by using the fused deposition modeling (FDM) process under application of pressure to improve the structure of the printed part. Three types of pressing tool has been developed which are roller pressing, ball-shaped pressing and flat-plate pressing that act as a pressure distributor during the 3D printing process. Every types of pressing tool has different shape, ability and function to achieve the most optimum physical behavior of the printed parts. Hence, the results of the samples printed using normal open source 3D printer, commercial 3D printer and improved open source 3D printer of roller pressing tool, ball-shaped pressing tool and flat-plate pressing tool were compared. The parameters that were controlled were layer thickness, fill density, pattern spacing and print speed. The physical behavior of the samples including tensile strength, porosity percentage, surface roughness and dimensional accuracy were observed using Instron machine, scanning electron microscope (SEM), surface roughness tester and 3D laser scanner. The open source 3D printer with roller pressing tool has the highest tensile strength of 38.34 MPa at 0.1 mm layer thickness with lowest porosity percentage of 13.67 % at 1 mm pattern spacing and lowest surface roughness of 1.28 µm at 0.1 mm layer thickness. The application of the roller pressing tool has successfully improved the physical behavior of the printed sample as the roller rolls on the surface layers to distribute the pressure evenly all over the surface causing the contact surface between the layers become larger while reducing the porous areas. The reading of the surface roughness also reduce as the roller removes the uneven surface and smooth the layers.