Rapid Prototyping

Chua, Chee Kai; Leong, Kah Fai; Lim, Chu Sing

doi:10.1142/6665

Cited by 298 publications

(107 citation statements)

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“…The *.stl format is the standard format for a majority of rapid prototyping technologies. A volume of parts saved in the *.stl format is a compound of an unorganized mesh of triangular shaped surfaces [7,8,9,10]. The position of each of these triangles is given by the coordinates X, Y, and Z of each of its vertices and a normal vector to its surface.…”

Section: Manufacturing Of Modelmentioning

confidence: 99%

“…The direction of the vector determines the orientation of the triangle. It defines the side of the triangle that would be oriented outwards of parts body [7,8,9]. The next essential finding is that a geometry of the *.stl part is always an approximation of the shape created by the parametric modeler.…”

Section: Manufacturing Of Modelmentioning

confidence: 99%

“…When the model is converted to the *.stl format, various types of defects can be generated in the mesh. The most common are flipped triangles, boundary edges, bad edges, holes, shells, intersecting or overlapping triangles [7,9,12]. The overwhelming majority of defects that are originated during the export of the parts to the *.stl format, are successfully eliminated using the software MiniMagics.…”

Section: Manufacturing Of Modelmentioning

confidence: 99%

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Design of stirling engine operating at low temperature difference

2018

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Abstract. There are many sources of free energy available in the form of heat that is often simply wasted. The aim of this paper is to design and build a low temperature differential Stirling engine that would be powered exclusively from heat sources such as waste hot water or focused solar rays. A prototype is limited to a low temperature differential modification because of a choice of ABSplus plastic as a construction material for its key parts. The paper is divided into two parts. The first part covers a brief history of Stirling engine and its applications nowadays. Moreover, it describes basic principles of its operation that are supplemented by thermodynamic relations. Furthermore, an analysis of applied Fused Deposition Modelling has been done since the parts with more complex geometry had been manufactured using this additive technology. The second (experimental) part covers 4 essential steps of a rapid prototyping method -Computer Aided Design of the 3D model of Stirling engine using parametric modeller Autodesk Inventor, production of its components using 3D printer uPrint, assembly and final testing. Special attention was devoted to last two steps of the process since the surfaces of the printed parts were sandpapered and sprayed. Parts, where an ABS plus plastic would have impeded the correct function, had been manufactured from aluminium and brass by cutting operations. Remaining parts had been bought in a hardware store as it would be uneconomical and unreasonable to manufacture them. Last two chapters of the paper describe final testing, mention the problems that appeared during its production and propose new approaches that could be used in the future to improve the project.

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Section: Manufacturing Of Modelmentioning

confidence: 99%

Section: Manufacturing Of Modelmentioning

confidence: 99%

Section: Manufacturing Of Modelmentioning

confidence: 99%

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Design of stirling engine operating at low temperature difference

2018

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“…The main advantages of this technology include: low maintenance cost, toxic free materials, quick production of complexity parts, and high utilization rate of raw materials. These aspects make it suitable for a wide range of applications in aerospace, automotive, biomedical, customer product industry, design and tooling [2][3][4] . Nevertheless, the main disadvantages are anisotropic property, requirement of support structures for overhangs and high surface roughness [5] .…”

Section: Introductionmentioning

confidence: 99%

Surface polish of PLA parts in FDM using dichloromethane vapour

2017

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Abstract. Fused deposition modelling has become one of the most diffused rapid prototyping techniques, which is widely used to fabricate prototypes. However, further application of this technology is severely limited by poor surface roughness. Thus it is necessary to adopt some operations to improve surface quality. Chemical finishing is typically employed to finish parts in fused deposition modelling (FDM). The purpose of this paper is to decrease the surface roughness for polylactic acid (PLA) parts in FDM. The chemical reaction mechanism during the treating process is analysed. Then NaOH solution and dichloromethane vapour are used to treat FDM specimens respectively. A 3D laser microscope has been applied to assess the effects in terms of surface topography and roughness. The experimental results show that treatment using dichloromethane vapour performs much better than NaOH solution. Compared with the untreated group, surface roughness obtained through vapour treatment decreases by 88 per cent. This research has been conducted to provide a better method to treat PLA parts using chemical reagents.

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“…Powder material is then injected into the melt pool through nozzles. The incoming powder is metallurgically bonded to the substrate upon solidification [1][2][3][4][5][6][7]. Conventionally, DLD (direct laser deposition) manufactured parts by adding materials layer by layer using pre-alloyed powder.…”

Section: Introductionmentioning

confidence: 99%

Effect of Powder Particle Size on the Fabrication of Ti-6Al-4V Using Direct Laser Metal Deposition from Elemental Powder Mixture

Chen¹,

Yan²,

Li³

et al. 2016

JMEA

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Direct LMD (laser metal deposition) was used to fabricate thin-wall Ti-6Al-4V using the powder mixture of Ti-6 wt.%Al-4 wt.%V. SEM (scanning electron microscopy), OM (optical microscopy) and EDS (energy dispersive spectroscopy) were employed to examine the chemical composition and microstructure of the as-deposited sections. Vickers hardness tests were then applied to characterize the mechanical properties of the deposit samples which were fabricated using pre-mixed elemental powders. The EDS line scans indicated that the chemical composition of the samples was homogenous across the deposit. After significant analysis, some differences were observed among two sets of deposit samples which varied in the particle size of the mixing Ti-6wt.%Al-4wt.%V powder. It could be found that the set with similar particle number for Ti, Al and V powder made composition much more stable and could easily get industry qualified Ti-6Al-4V components.

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Rapid Prototyping

Cited by 298 publications

References 0 publications

Design of stirling engine operating at low temperature difference

Design of stirling engine operating at low temperature difference

Surface polish of PLA parts in FDM using dichloromethane vapour

Effect of Powder Particle Size on the Fabrication of Ti-6Al-4V Using Direct Laser Metal Deposition from Elemental Powder Mixture

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