| Records |
| Author |
Junior, G.B.M.; Costa, C.A. |
| Title |
Manufatura aditiva aplicada na fabricação de insertos para moldes de injeção termoplásticos |
Type |
Journal Article |
| Year |
2019 |
Publication |
Scientia cum industria |
Abbreviated Journal |
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| Volume |
7 |
Issue |
2 |
Pages |
76-82 |
| Keywords |
Indústria 4.0 ; Manufatura aditiva de metal ; moldes de injeção |
| Abstract |
No processo produtivo, com moldes de injeção para peças termoplásticas, o tempo de resfriamento representa parcela significativa do ciclo. Sendo assim, torna se necessário, na etapa de projeto do molde, uma atenção em conseguir projetar o sistema de refrigeração, buscando se a máxima eficiência e homogeneidade com o resfriamento do produto. Para isto, os canais de refrigeração devem estar posicionados, o mais próximo possível, da superfície que molda a geometria da peça, buscando o resfriamento ideal. No projeto e fabricação convencional de moldes, estes canais possuem um posicionamento limitado, em razão de sua fabricação, que ocorre através de furações. Este artigo explora a aplicação do processo de manufatura aditiva na indústria de moldes e matrizes, bem como um estudo da viabilidade técnica e econômica, para a fabricação de insertos metálicos, como alternativa aos processos convencionais de manufatura desta área. Neste estudo foi realizada a simulação da eficiência da refrigeração, comparando o sistema de refrigeração tradicional de um inserto de aço AISI P20 de um molde exemplo, com um inserto otimizado quanto aos canais de refrigeração, fabricado em impressão 3D. Também foi realizada uma comparação do inserto original apresentado, fabricado em cobre berílio, como material alternativo, buscando melhorias no tempo do ciclo de resfriamento. A comparação dos tempos do ciclo de refrigeração, simulados com auxílio do software Solid Plastics, bem como os custos de fabricação, para cada um dos modelos de insertos propostos, permitiu enumerar as vantagens e desvantagens de cada configuração. |
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| Publisher |
Universidade de Caxias do Sul |
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Original Title |
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Edition |
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| ISSN |
2318-5279 |
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no |
| Call Number |
1 @ metmet3 @ GastãoBoccardiMarquesJunior2019Maan |
Serial  |
17802 |
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| Author |
Dana, H.R.; El Mansori, M. |
| Title |
Mechanical characterisation of anisotropic silica sand/furan resin compound induced by binder jet 3D additive manufacturing technology |
Type |
Journal Article |
| Year |
2020 |
Publication |
Ceramics international |
Abbreviated Journal |
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| Volume |
46 |
Issue |
11 |
Pages |
17867-17880 |
| Keywords |
3D sand print process ; Compression test ; Mechanical characterisation ; Microstructural ; Printing parameter |
| Abstract |
Binder jet 3D printing of ceramic materials is an additive manufacturing technology that enables the production of complex and multi-functional parts through the selective jet binding of precursor powder beds. The present study makes use of the 3D Sand Printing (3DSP) process to create moulds and cores in the casting industry. The use of the 3DSP components as functional parts in industrial production is limited due to the uncertainty associated with their mechanical properties, such as their permeability and thermal stability. Moreover, because of the porous nature of their printed structures, their mechanical properties are dispersed and rather difficult to reproduce. This study aims to characterise the impact of different printing parameters on the mechanical performance of printed parts. For this purpose, a specific device was made in order to assess the mechanical characteristics of samples printed via this technique. The effects of processing parameters such as the printing orientation and building direction on the compressive properties of the printed specimens have also been carefully studied. Microstructural analyses were performed to better understand the relationship between the 3DSP process and the mechanical properties of the components produced from it. The results show that the mechanical tests carried out significantly improve the property reproducibility of the samples made using this technique. |
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| Publisher |
Elsevier Ltd |
Place of Publication |
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Series Issue |
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Edition |
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| ISSN |
0272-8842 |
ISBN |
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no |
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1 @ metmet3 @ DanaH.Ramezani2020Mcoa |
Serial |
17801 |
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| Author |
Federowicz, K.; Kaszynska, M.; Zielinski, A.; Hoffmann, M. |
| Title |
Effect of Curing Methods on Shrinkage Development in 3D-Printed Concrete |
Type |
Journal Article |
| Year |
2020 |
Publication |
Materials |
Abbreviated Journal |
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| Volume |
13 |
Issue |
11 |
Pages |
2590 |
| Keywords |
3D Concrete Printing ; additive manufacturing ; curing conditions ; digital construction ; shrinkage |
| Abstract |
Technological developments in construction have led to an increase in the use of 3D modelling using CAD environments. The popularity of this approach has increased in tandem with developments in industry branches which use 3D printers to print concrete based printing materials in construction, as these allow freedom in shaping the dimensions of supporting elements. One of the biggest challenges for researchers working on this highly innovative technology is that of cement material shrinkage. This article presents the findings of research on an original method of measuring deformations caused by shrinkage in 3D-printed concrete elements. It also discusses the results of tests on base mixes, as well as comparisons between the influence of internal and external curing methods on the development of deformations and their final outcomes. Furthermore, the article discusses differences between deformations formed after seven days of hardening without curing, with those which occur when two common, traditional concrete curing methods are used: foil insulation and shrinkage reducing admixtures. In addition, the article examines the effects of internal curing on the 1, 7, 14, 21 and 28 day mechanical properties of concrete, in accordance with EN 196-1 and EN 12390-2. Studies have shown that the optimal amount of shrinkage reducing admixtures is 4% (in relation to the mass of cement), resulting in a reduction in total shrinkage of 23%. The use of a shrinkage reducing admixture in 3D-printed concrete does not affect their strength after 28 days, but slows the strength development during the first 7 days. |
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Mdpi |
Place of Publication |
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Edition |
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| ISSN |
1996-1944 |
ISBN |
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Approved |
no |
| Call Number |
1 @ metmet3 @ FederowiczKarol2020EoCM |
Serial |
17800 |
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| Author |
Garcia, C.R.; Rumpf, R.C.; Tsang, H.H.; Barton, J.H. |
| Title |
Effects of extreme surface roughness on 3D printed horn antenna |
Type |
Journal Article |
| Year |
2013 |
Publication |
Electronics letters |
Abbreviated Journal |
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| Volume |
49 |
Issue |
12 |
Pages |
1 |
| Keywords |
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| Abstract |
A 3D printing is an emerging technology in manufacturing. It is the long-term goal of the industry to print complex and fully functional products from cell phones to vehicles. A drawback of many 3D printing technologies is rough surface finish. It is known that metals with high surface roughness severely degrade the propagation of electromagnetic waves. Presented is the first known evaluation of the electromagnetic impact of the typical surface roughness in metal parts produced by electron beam melting. Two Ku-band (12-15 GHz) horn antennas were 3D printed, with different surface roughness, and compared to a standard horn antenna purchased from Pasternack. |
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Thesis |
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| Publisher |
The Institution of Engineering & Technology |
Place of Publication |
Stevenage |
Editor |
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Summary Language |
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Original Title |
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Series Title |
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Abbreviated Series Title |
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Series Issue |
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Edition |
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| ISSN |
0013-5194 |
ISBN |
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no |
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1 @ metmet3 @ CRGarcia2013Eoes |
Serial |
17799 |
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| Author |
Forcael, E.; Pérez, J.; Vásquez, Á.; García-Alvarado, R.; Orozco, F.; Sepúlveda, J. |
| Title |
Development of Communication Protocols between BIM Elements and 3D Concrete Printing |
Type |
Journal Article |
| Year |
2021 |
Publication |
Applied sciences |
Abbreviated Journal |
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| Volume |
11 |
Issue |
16 |
Pages |
7226 |
| Keywords |
3D concrete printing ; additive manufacturing ; building information modeling ; communication protocols |
| Abstract |
Historically, the construction industry has exhibited slow technological development when compared to other industries. However, during the last several years, investigations related to automation in construction have been conducted, such as additive manufacturing in concrete. This study aims to delve into this topic, providing effective communication between BIM-designed elements and its additive concrete manufacturing, with the help of an articulated robotic arm. Therefore, the paper addresses the preparation of computer code that allows such BIM-robot communication, checking the parameters utilized, and analyzing the results of tests with the equipment involved. |
| Address |
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| Corporate Author |
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Thesis |
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| Publisher |
Mdpi Ag |
Place of Publication |
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Editor |
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Summary Language |
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Original Title |
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| Series Editor |
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Series Title |
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Abbreviated Series Title |
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Series Issue |
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Edition |
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| ISSN |
2076-3417 |
ISBN |
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Medium |
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Expedition |
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Conference |
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| Notes |
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Approved |
no |
| Call Number |
1 @ metmet3 @ ForcaelEric2021DoCP |
Serial |
17798 |
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