Influence of hybrid mould on moulded parts properties

Godec, Damir; Šercer, Mladen; Rujnić‐Sokele, Maja

doi:10.1108/13552540810862055

Cited by 16 publications

(13 citation statements)

References 8 publications

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“…The impact loads and, in particular, high strain rate tensile impact, can be critical issues in FFF parts and, in general, for plastic materials [21,22]. However, limited research has been done in understanding the impact mechanical behaviour of FFF 3D printed parts and, to the authors’ knowledge, no research work has been done about the tensile impact strength of FFF.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Behaviour of ABS-Fused Filament Fabrication Compounds under Impact Tensile Loadings

et al. 2019

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In the Fused Filament Fabrication (FFF) process, the part is built as a layer-by-layer deposition of a feedstock filament material. The continuous improvements of the FFF have changed the main purpose of this technique from rapid prototyping to a rapid manufacturing method. Then, it is fundamental to determine the material properties of FFF parts as a function of the service load. The impact loads and, in particular, a high strain rates tensile impact can be a critical issue in FFF part and, in general, for plastic materials. The aim of the present work is to characterise the mechanical behaviour of FFF parts under tensile impact loads. To this purpose, three different orientations (i.e., 0°, 45° and 90°) both single- and multilayer specimens, have been printed. Finally, the influence of the impact speed on the mechanical behaviour has also been tested under three different values of speed (3.78 m/s, 3.02 m/s and 2.67 m/s). The results show that the FFF parts are influenced by the raster orientation, confirming the orthotropic behaviour also under dynamic loads, while the variation of impact speed, on peak force and absorbed energy, is limited.

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Section: Introductionmentioning

confidence: 99%

Mechanical Behaviour of ABS-Fused Filament Fabrication Compounds under Impact Tensile Loadings

et al. 2019

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“…Under the action of the laser beam's thermal energy, the powdery material softens and this results in mutual sintering of material particles and fusion of the newly applied layer of powder with the previously sintered layer (Pilipovic et al, 2010;Godec et al, 2008;Drstvenšek et al, 2008).…”

Section: Selective Laser Sinteringmentioning

confidence: 99%

“…In SLS procedure, the laser beam is directed by a mirror and marks the cross-section of the product on the powdery material located on the working platform. Under the action of the laser beam's thermal energy, the powdery material softens and this results in mutual sintering of material particles and fusion of the newly applied layer of powder with the previously sintered layer (Pilipovic et al, 2010;Godec et al, 2008;Drstvenšek et al, 2008).…”

Section: Selective Laser Sinteringmentioning

confidence: 99%

Influence of SLS processing parameters according to the new mathematical model on flexural properties

Pilipović

Valentan

Šercer

2016

RPJ

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If you would like to write for this, or any other Emerald publication, then please use our Emerald for Authors service information about how to choose which publication to write for and submission guidelines are available for all. Please visit www.emeraldinsight.com/authors for more information. About Emerald www.emeraldinsight.comEmerald is a global publisher linking research and practice to the benefit of society. The company manages a portfolio of more than 290 journals and over 2,350 books and book series volumes, as well as providing an extensive range of online products and additional customer resources and services.Emerald is both COUNTER 4 and TRANSFER compliant. The organization is a partner of the Committee on Publication Ethics (COPE) and also works with Portico and the LOCKSS initiative for digital archive preservation. AbstractPurpose -The purpose of this paper is the selection of production parameters in selective laser sintering -SLS for the production of quality products (e.g. good mechanical properties). The manufacturing procedure affects the properties, which is especially significant in additive procedures, as the products are not cheap and the procedure and material need to be optimally selected. Design/methodology/approach -The paper presents an analysis of the fabrication parameters in selective laser sintering (SLS) that affect the flexural properties of the finished product. Findings -The influence of a new parameter has been found, the overlay ratio, and using the mathematical and scheme method, the selection of parameters for obtaining the optimal flexural properties has been proposed. Originality/value -The paper presents a new mathematical model for the calculation of the processing parameters in SLS of polymer products and gives a diagram for the determination of which parameters are the best to use for practical purposes.

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“…They have found that the most important parameters affecting each mechanical property vary at different levels for the two mold materials. Godec et al [8] sought to approximate the mass, dimension and tensile impact strength among PP moldings obtained in different tool materials through the packing pressure, melt temperature and injection time parameters. The tool materials were the LaserForm A6, obtained in an indirect metal laser sintering process, infiltrated with bronze, and the steel 40CrMn-MoS8 6, obtained by machining.…”

Section: Introductionmentioning

confidence: 99%

Adjusting process parameters in zamak-8 prototype tooling to obtain functional prototypes in PP

Volpato

Junkes

2020

J Braz. Soc. Mech. Sci. Eng.

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Prototype tooling is an option to obtain functional prototypes, or even final parts, in low-scale injection molding. In order to reduce the manufacturing time and cost of this type of tooling, alternative materials, such as zinc alloys, can be employed. However, the mold material and injection parameters can influence molding crystallinity and mechanical properties. The zinc alloy known as zamak-8 has not been explored much for this application. The objective of this work is to study the influence of this mold material on the properties of polypropylene (PP) when varying the mold (T m) and injection (T i) temperatures. Then, based on that, to develop some regression models to help obtain PP moldings in the zamak-8 mold with similar characteristics to those injected in a steel mold, which was used as a reference, the characterization techniques used were tensile and impact tests, and differential scanning calorimetry as well, to measure crystallinity. The results showed that zamak-8 prototype tooling only has a significant influence on the impact strength of the injected PP. The regression models showed that to obtain injected prototypes with mechanical and crystalline properties close to a production part in this specific study, T m should be set at around 40 °C and T i at 225 °C. In general, this indicates that zamak-8 can be used to obtain functional prototypes in PP with similar properties to the production parts.

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Influence of hybrid mould on moulded parts properties

Cited by 16 publications

References 8 publications

Mechanical Behaviour of ABS-Fused Filament Fabrication Compounds under Impact Tensile Loadings

Mechanical Behaviour of ABS-Fused Filament Fabrication Compounds under Impact Tensile Loadings

Influence of SLS processing parameters according to the new mathematical model on flexural properties

Adjusting process parameters in zamak-8 prototype tooling to obtain functional prototypes in PP

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