DEMIRCIOGLU, Pinar, BOGREKCI, Ismail, SUCUOGLU, H. Saygin, and GUVEN, Emrah
Sigma: Journal of Engineering & Natural Sciences / Mühendislik ve Fen Bilimleri Dergisi; 2020, Vol. 38 Issue 1, p21-28, 8p
DIGITAL image processing, RAPID prototyping, COMPUTER-aided design, INTERFACIAL bonding, STEREOLITHOGRAPHY, INDUSTRIAL capacity, 3-D printers, MANUFACTURING processes, and IMAGE processing
The aim of this study is to investigate the relationship between the fusion temperature and dimensional accuracy of the 3D printed components. The Computer Aided Design (CAD) model of specimens were prepared using Autodesk Inventor Software. Then the models were exported to STL file format for rapid prototyping. Prusa İ3 desktop type 3D printer with 90-300 microns layer height manufacturing capacity was used to produce the samples. The printer settings were prepared with Simplified3D software. Infill density and layer height of specimens were determined as 20% and 200 microns, respectively. The heated bed temperature was selected as 60 °C to increase the bonding and surface quality. The specimens were produced as sphere with the diameter of 10 mm. The samples were manufactured with five different extruder temperatures (185, 195, 205, 215, and 220 °C) that directly affect the fusing temperature and process. Three samples spheres were produced for each fusion temperature. After the design and manufacturing processes the dimensions of produced samples were measured with image processing techniques. The obtained results were compared with each other to find the relationship between the dimensional accuracy and fusion temperatures. The results showed that the minimum dimensional error was obtained from the fusion temperature of 185 °C with the value of 0.290797 mm and percentage of 3%. [ABSTRACT FROM AUTHOR]
This paper first reviews manufacturing technologies for realizing air-filled metal-pipe rectangular waveguides (MPRWGs) and 3-D printing for microwave and millimeter-wave applications. Then, 3-D printed MPRWGs are investigated in detail. Two very different 3-D printing technologies have been considered: low-cost lower-resolution fused deposition modeling for microwave applications and higher-cost high-resolution stereolithography for millimeter-wave applications. Measurements against traceable standards in MPRWGs were performed by the U.K.’s National Physical Laboratory. It was found that the performance of the 3-D printed MPRWGs were comparable with those of standard waveguides. For example, across X-band (8–12 GHz), the dissipative attenuation ranges between 0.2 and 0.6 dB/m, with a worst case return loss of 32 dB; at W-band (75–110 GHz), the dissipative attenuation was 11 dB/m at the band edges, with a worst case return loss of 19 dB. Finally, a high-performance W-band sixth-order inductive iris bandpass filter, having a center frequency of 107.2 GHz and a 6.8-GHz bandwidth, was demonstrated. The measured insertion loss of the complete structure (filter, feed sections, and flanges) was only 0.95 dB at center frequency, giving an unloaded quality factor of 152—clearly demonstrating the potential of this low-cost manufacturing technology, offering the advantages of lightweight rapid prototyping/manufacturing and relatively very low cost when compared with traditional (micro)machining. [ABSTRACT FROM PUBLISHER]
THREE-dimensional printing, STEREOLITHOGRAPHY, RAPID prototyping, and 3-D printers
The article provides an overview of the development of three-dimensional (3D) printing technology. The process of printing solid objects by progressive layering was first named stereolithography (SLA), patented and invented by Charles W. Hull in 1983. Industrial companies and universities started to use 3D printing by late 1980s for rapid prototyping. More than 50,000 3D printers were traded in 2013 and is anticipated to double by 2015.
THREE-dimensional printing, RAPID prototyping, 3-D printers, STEREOLITHOGRAPHY, and LASER sintering
The article reports on how businesses can use additive manufacturing or 3-D printing for producing jigs, fixtures and other production parts in addition to producing prototypes. Topics discussed include fuse deposition modeling, PolyJet technology, stereolithography, laser sintering and metal sintering. Also mentioned are the advantages of creating jigs and fixtures using additive manufacturing and how to implement additive manufacturing in design and development process.
AUTOMATED storage retrieval systems, 3-D printers, STEREOLITHOGRAPHY, PRINT materials, MATERIALS handling, WASTE products, CONSTRUCTION materials, and DENTAL materials
Purpose: The purpose of this paper is to introduce a novel technique for printing with multiple materials using the DLP method. Digital-light-processing (DLP) printing uses a digital projector to selectively cure a full layer of resin using a mask image. One of the challenges with DLP printing is the difficulty of incorporating multiple materials within the same part. As the part is cured within a liquid basin, resin switching introduces issues of cross-contamination and significantly increased print time. Design/methodology/approach: The material handling challenges are investigated and addressed by taking inspiration from automated storage and retrieval systems and using an active cleaning solution. The material tower is a compact design to facilitate the storage and retrieval of different materials during the printing process. A spray mechanism is used for actively cleaning excess resin from the part between material changes. Findings: Challenges encountered within the multi-material DLP technology are addressed and the experimental prototype validates the proposed solution. The system has a cleaning effectiveness of over 90 per cent in 15 s with the build area of 72 inches, in contrast to the previous work of 50 per cent cleaning effectiveness in 2 min with only 6 inches build area. The method can also hold more materials than the previous work. Originality/value: The techniques from automated storage and retrieval system is applied to develop a storage system so that the time complexity of swapping is reduced from linear to constant. The whole system is sustainable and scalable by using a spraying mechanism. The design of the printer is modular and highly customizable, and the material waste for build materials and cleaning solution is minimized. [ABSTRACT FROM AUTHOR]