Papers by Keyword: Rapid Prototyping (RP)

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Authors: Hong Kyu Kwon, Moo Kyung Jang
Abstract: This paper presents our concepts and initial investigation of a novel construction automation approach using a new layered fabrication process called Contour Crafting (CC). The process aims at automated construction of whole houses as well as sub-components. The potential of CC became evident from the initial investigations and experiments with various materials and geometries. Using this process, a single house or a colony of houses, each with possibly a different design, may be automatically constructed in a single run. CC uses computer control to take advantage of the superior surface forming capability of trowels to create large intricate structures with smooth and accurate surfaces.
Authors: O.M.F. Marwah., S. Sharif, M.A. Zainol, M. Ibrahim, Elmy Johana Mohamad
Abstract: The term direct investment casting represents the employment of pattern fabricated by rapid prototyping technique have been reduce the cost and production lead time. The non-wax materials having robust ability on producing pattern in accuracy stability and clean burnout. However 3D printer (3DP) parts are powder based materials and not easily burnout during firing process. The purpose of this investigation were to evaluate the ZP150 powder materials as a sacrificial pattern to be used in investment casting (IC) process. Result shows powder based patterns of 3DP process failed to disintegrate completely even at high temperature during collapsibility investigations. However the pattern become brittle and easily remove by water pressure. Therefore the ceramic mould can be used for metal casting.
Authors: M. Dourandish, Dirk Godlinski, Abdolreza Simchi
Abstract: The fabrication of complex-shaped parts out of Co-Cr-Mo alloy and 316L stainless steel by three-dimensional printing (3DP) is studied using two grades of each alloy with average particle size of 20 and 75 )m, respectively. To produce sound specimens, the proper 3DP processing parameters were determined. The sintering behavior of the powders is characterized by dilatometric analysis and by batch sintering in argon atmosphere at 1280°C for 2h. The 3DP process has successfully produced complex-shaped biomedical parts with total porosity of 12-25% and homogenous pore structure, which is suitable for tissue growth into the pores.
Authors: S. Singare, Shou Yan Zhong, Zhen Zhong Sun
Abstract: In this paper, the authors describe a rapid prototyping method to produce vascularized tissue such as liver scaffold for tissue engineering applications. A scaffold with an interconnected channel was designed using a CAD environment. The data were transferred to a Polyjet 3D Printing machine (Eden 250, Object, Israel) to generate the models. Based on the 3D Printing model, a PDMS (polydimethyl-silicone) mould was created which can be used to cast the biodegradable material. The advantages and limitations of Rapid Prototyping (RP) techniques as well as the future direction of RP development in tissue engineering scaffold fabrication were reviewed.
Authors: Fwu Hsing Liu, Yunn Shiuan Liao
Abstract: This article proposes a rapid prototyping apparatus of selective laser sintering for forming silica ceramic green parts. The main differences between the proposed and other RP processes for forming ceramic part are the slurry material used to obtain fine layer thickness and the capability of constructing support structure to increase the dimensional accuracy of the workpiece having an overhang. The RP apparatus developed by us comprises a laser scanning system, a material paving system, and a computer control system. A CO2 laser is adopted to scan over a mixture made of a silica sol and silica powder. The silica sol acts as a binder to gel the silica powder together, which forms a 3D object using laser gelation method. A series of experiments were carried out to obtain the optimal process parameters. An SEM is employed to analyze the microstructure of the ceramic part. It has been found that the smallest layer is of 100 μm thick. The results show that both the accuracy of the material paving mechanism and the optimal process parameters can fulfill the requirements of the RP processes.
Authors: Jin Song Chen, Yin Hui Huang, Bin Qiao, Jian Ming Yang, Yi Qiang He
Abstract: The principles of jet electrodeposition orientated by rapid prototyping were introduced. The nanocrystalline nickel parts with simple shape were fabricated using jet electrodeposition. The microstructure and phase transformation of nanocrystalline nickel were observed under the scanning microscope and X-ray diffraction instrument. The results show that the jet electrodeposition can greatly enhance the limited current density, fine crystalline particles and improve deposition quality. The nickel parts prepared by jet electrodeposition own a fine-grained structure (average grain size 25.6nm) with a smooth surface and high dimensional accuracy under the optimum processing parameters.
Authors: Yusoff Way, Mohamad Ali Hasanudin Hafis, Md. Amir Hamzah Md. Shukri
Abstract: The purpose of this research is to fabricate maxillofacial biomodel and apply the rapid prototyping technology using Fused Deposition Modeling (FDM) in solving some surgical problem in medical field. The build biomodel will be used in educational and pre-medical surgical environments. Besides, it can simplify the complex surgical procedures and the visualization of anatomical structures. A machine that works under FDM principle will be used to produce a finished biomodel. Product analysis later is implemented to make the result more trustful. Thus, it is demonstrated that biomodel can help surgical planning and at the same time it will reduce costs, surgical times and infection risks in health care system.
Authors: Mao Liang Wu, Lin Jun Hua
Abstract: The paper analyzes the structure of SLC file format which is used in rapid prototyping technology, and studies the algorithm of the scanning path through improving the line-filling algorithm. The scanning path is carried out with VC++ software and the wind power generator blade and car logo are dissected to validate the algorithm. At last, the paper analyzes the influences of the slice thickness and hatch gap on the paths, and compares the file sizes and the scanning path length under different file formats and scanning parameters.
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