1,721,057 research outputs found
Non-Newtonian, non-isothermal three-dimensional modeling of strand deposition in screw-based material extrusion
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An application- and market-oriented review on large format additive manufacturing, focusing on polymer pellet-based 3D printing
No full textSince this advent, additive manufacturing (AM) has grown steadily and found applications across all types of sectors. While the great development of such technologies has improved the quality of prints and expanded the availability of materials, AM still has some limitations regarding its physical scaling. This paper will briefly present the state-of-the-art of large-scale additive manufacturing and subsequently greater attention will be given to extrusion-based 3D printing. Specifically, we will discuss about large format additive manufacturing (LFAM) or big area additive manufacturing (BAAM), a technology based on material extrusion born a few years ago. These systems are characterized by higher deposition rate and lower costs of the material compared to fused filament fabrication (FFF) printers; moreover, they allow to obtain parts with better properties (e.g., adding carbon or glass fibers). The world of research has shown great interest in large-scale material extrusion technologies, which appear to be quite competitive with conventional manufacturing processes and which will find increasing application in the industrial field. With the aim of developing a tool for orienting researchers and technicians in this complex field, the present paper presents a systematic review of the actual market of machines, the research in extrudable materials and related applications concerning large-scale 3D printing, and in particular the LFAM
“The making of environmental policy in an Input-Output framework”, in Gorla and Percoco(a cura di), Politica ambientale, reti e territorio, EGEA (2005)
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A multilevel approach to edge detection in tessellated point clouds
No full textMost rapid prototyping (RP) additive techniques are expensive and suffer from a lack of efficiency when massive products are to be manufactured. The authors propose to reduce the density of rapid prototyped parts, finding alternative building styles. Topologically optimized parts have been created with internal geometry, using a narrow-waisted structure that avoids the need for building supports. In order to characterise and study the behaviour of the obtained low density parts, an experimental plan has been designed and executed. The approach has been tested using a fused deposition modelling (FDM) machine, but it is of a general nature and can be applied to other layered manufacturing (LM) technologies that use supports, dealing with slow building of massive parts
Additive Manufacturing for Soft Electromagnetic Robots: Experimental Study to Reduce Vibration
No full text3D Printing of Shape Memory Polymers: Embedding Nichrome-Wires to Enhance Their Performance
No full textTelemanufacturing of reverse engineered parts: a case study
No full textA product idea is normally transferred between designers and/or manufacturing engineers using digital models. Engineering analyses are directly, connected with the presence of these models and only limited to virtual evaluations. For this reason, the use of real,prototypes is very important in the first design stage in order to perform a deeper product evaluation. A very attractive way to update product designs while realizing prototypes is offered by the direct data communication between reverse engineering (RE) and rapid prototyping (RP). In this way the reproduction of aesthetic prototypes in different geographical. positions, becomes a key factor for successful' competition. In this article, the authors investigation the efficiency of the data transfer between RE and RP systems in order to speed up product development without sharing design intent. A: specialized software tool is described in order to perform Product shape acquisition, elimination of, redundant point cloud data, retriangulation of the point loud and generation of a machine file for RP fabricatio
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