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Minimizing Deformations during HP MJF 3D Printing
No full text(1) Background: The purpose of this study was to investigate deformations that occur during additive manufacturing by the HP (Hewlett-Packard) Multi Jet Fusion (MJF) process. These deformations affect the final properties of 3D-printed parts, and proper compensating technology has to be developed in order to minimize these deformations. (2) Methods: Parts were printed with powder composed of nylon plastic infused with glass beads (PA12GB). The HP MJF technology was used during investigations. All parts (specimens) were measured at different points over an extended period to follow the deformations at each point. Different finite element simulations were performed to compare them with real results and assess the viability of using simulations to save time. Various modules of the Digimat software, such as additive manufacturing (AM), material focused (MF), finite element (FE), and computer-aided engineering (CAE), were used to run the simulations. (3) Results: It was found that the printing position of the part in the printer had an impact on deformations. When the part was simulated in a tilted position but alone (deformation: 7.19 mm), the value of the deformation was 1.49 mm greater than when the other parts (two comparable parts) were simulated at the same time (deformation: 5.7 mm). The difference between the simulation with the three parts together (deformation: 5.7 mm) and reality (deformation: 3.44 mm) was 2.26 mm. Finally, the difference between the simulated single part (deformation: 7.19 mm) and the real part (deformation: 3.44) was 3.75 mm. (4) Conclusions: The results of this study will contribute to a better understanding of deformation mechanisms and will suggest solutions for improving the quality of printed parts. Three-dimensional printing is a rapidly growing technology that offers numerous possibilities across various fields. However, one commonly encountered issue is the deformation of printed parts. Methods for minimizing deformations were studied during the 3D printing process using HP MJF technology. Various factors contributing to deformation were investigated, and different techniques for reducing them were explored
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Method to Balance Thermals for Multi-functional 3D MJF Printing
Get PDFHP’s Multi Jet Fusion (MJF) is a powder-based additive manufacturing technology that
selectively melts polymer powder, in a layer-by-layer fashion to create 3D parts. There are
several different voxel properties that can be modulated using MJF including multi-color,
ductility, conductivity, among others. Creating mechanically uniform multi-material parts with
varying voxel properties throughout is challenging due to the liquid creating a competing
cooling and active absorbing components that effect the temperature of printed parts
differently. Here, we balance fusibility by utilizing a thermal imaging and an agent loading
sweep thermal profile characterization print for each individual agent. We then digitally control
the agent loading based on this data set and dynamic thermal imaging to produce a uniform
temperature profile. This ensures even fusing throughout multi-agent printed parts, shown by
uniform weight measurements of multi-color cubes from average weight 1.4 ± 0.2 g to 1.5 ±
0.1 g.Mechanical Engineerin
ELECTRONICALLY TUNABLE, 1.55-MUM ERBIUM-DOPED FIBER LASER
No full textThe authors thank W. Miniscalco of GTE for supplying
the fiber used. P. F. Wysocki acknowledges the
fellowship support of the National Science Foundation.
This research was supported by Litton Systems,
Inc
SPECTRAL CHARACTERISTICS OF HIGH-POWER 1.5 MU-M BROAD-BAND SUPERLUMINESCENT FIBER SOURCES
No full textA comparative analysis of surface and mechanical properties in MJF 3D printed parts: impact of diverse post-processing approaches
No full textEsta tesis tiene como objetivo analizar las propiedades superficiales y mecánicas de piezas impresas en 3D después de diversas técnicas de post-procesamiento. Inicialmente, se revisan técnicas avanzadas de fabricación aditiva y sus aplicaciones en materiales poliméricos para establecer una base teórica. La investigación luego se centra en los detalles de los polímeros HP Multi Jet Fusion (MJF) y su caracterización.
Se diseñaron y fabricaron especímenes de prueba según normas establecidas. El estudio se divide en dos partes principales: el ensayo de flexión de cuatro puntos, que mide características mecánicas, y la evaluación de parámetros de rugosidad superficial.
Los resultados muestran correlaciones significativas entre las técnicas de post-procesamiento y tanto la calidad superficial como las propiedades mecánicas de las piezas impresas en 3D por MJF.
Esta investigación destaca el papel crítico del post-procesamiento en la optimización del rendimiento de las piezas impresas en 3D por MJF. Los hallazgos ofrecen ideas valiosas para las industrias que buscan aprovechar la tecnología MJF para aplicaciones de alto rendimiento, proporcionando una base para seleccionar métodos de post-procesamiento adecuados para lograr resultados deseados tanto en calidad superficial como en robustez mecánica.This thesis aims to analyze the surface and mechanical properties of 3D printed parts after various post-processing techniques. Initially, advanced additive manufacturing techniques and their applications to polymer materials are reviewed to establish a theoretical foundation. The research then focuses on the specifics of HP Multi Jet Fusion (MJF) polymers and their characterization.
Test specimens were designed and fabricated according to established standards. The study is divided into two main parts: the four-point bending test, which measures mechanical characteristics, and the evaluation of surface roughness parameters.
The results show significant correlations between post-processing techniques and both surface quality and mechanical properties of MJF 3D printed parts.
This research highlights the critical role of post-processing in optimizing the performance of MJF 3D printed parts. The findings offer valuable insights for industries seeking to leverage MJF technology for high-performance applications, providing a basis for selecting appropriate post-processing methods to achieve desired outcomes in both surface quality and mechanical robustness.Aquesta tesi té com a objectiu analitzar les propietats superficials i mecàniques de les peces impreses
en 3D després de l’aplicació de diverses tècniques de post-processament. En primer lloc, es revisen
tècniques avançades de fabricació additiva i les seves aplicacions en materials polimèrics per establir
una base teòrica sòlida. A continuació, la investigació se centra en els polímers de HP Multi Jet Fusion
(MJF) i la seva caracterització específica.
Es van dissenyar i fabricar espècimens de prova segons els estàndards establerts. L’estudi es divideix
en dues parts principals: la prova de flexió en quatre punts, que mesura les característiques mecàniques,
i l’avaluació dels paràmetres de rugositat superficial.
Els resultats mostren correlacions significatives entre les tècniques de post-processament i la qualitat
superficial, així com les propietats mecàniques de les peces impreses en 3D mitjançant MJF.
Aquesta investigació ressalta el paper crucial del post-processament en l’optimització del rendiment de
les peces impreses en 3D amb MJF. Les troballes proporcionen perspectives valuoses per a les indústries
que busquen aprofitar la tecnologia MJF per a aplicacions d’alt rendiment, oferint una base per a la
selecció de mètodes de post-processament adequats per aconseguir els resultats desitjats en termes de
qualitat superficial i robustesa mecànica
Tool for Air Humidity Control of MJF 3D printers
No full textThis idea relates to a humidity control tool designed for the print chamber of Multi Jet Fusion (MJF) 3D printers. This idea introduces a system that continuously monitors and regulates humidity during printing, ensuring stable conditions for improved process control and repeatability. By maintaining a stable humidity environment in the print chamber, the tool improves print quality, reduces material waste, and enhances process reliability across varying ambient conditions
WAVELENGTH STABILITY OF A HIGH-OUTPUT, BROAD-BAND, ER-DOPED SUPERFLUORESCENT FIBER SOURCE PUMPED NEAR 980-NM
No full textWe report the dependence of the mean wavelength of Er-doped superfluorescent fiber sources on temperature, pump wavelength, and pump power. In particular, we measure an intrinsic temperature coefficient of between -2 and +8 parts in 10(6) (ppm) per degree Celsius depending on pump wavelength, pump power, and fiber length. Additionally, we report a pump wavelength dependence that is symmetrical about the peak pump absorption wavelength (near 976 nm) and a decrease in mean wavelength with pump power with a slope of between 0 and -93 ppm/mW.This research was supported by Litton Systems, Inc.
The research of P. F. Wysocki is partially supported
by the National Science Foundation. The authors are
grateful to AT&T for providing the Er-doped fiber
used in this study
A comparative analysis of surface and mechanical properties in MJF 3D printed parts: impact of diverse post-processing approaches
Get PDFEsta tesis tiene como objetivo analizar las propiedades superficiales y mecánicas de piezas impresas en 3D después de diversas técnicas de post-procesamiento. Inicialmente, se revisan técnicas avanzadas de fabricación aditiva y sus aplicaciones en materiales poliméricos para establecer una base teórica. La investigación luego se centra en los detalles de los polímeros HP Multi Jet Fusion (MJF) y su caracterización.
Se diseñaron y fabricaron especímenes de prueba según normas establecidas. El estudio se divide en dos partes principales: el ensayo de flexión de cuatro puntos, que mide características mecánicas, y la evaluación de parámetros de rugosidad superficial.
Los resultados muestran correlaciones significativas entre las técnicas de post-procesamiento y tanto la calidad superficial como las propiedades mecánicas de las piezas impresas en 3D por MJF.
Esta investigación destaca el papel crítico del post-procesamiento en la optimización del rendimiento de las piezas impresas en 3D por MJF. Los hallazgos ofrecen ideas valiosas para las industrias que buscan aprovechar la tecnología MJF para aplicaciones de alto rendimiento, proporcionando una base para seleccionar métodos de post-procesamiento adecuados para lograr resultados deseados tanto en calidad superficial como en robustez mecánica.This thesis aims to analyze the surface and mechanical properties of 3D printed parts after various post-processing techniques. Initially, advanced additive manufacturing techniques and their applications to polymer materials are reviewed to establish a theoretical foundation. The research then focuses on the specifics of HP Multi Jet Fusion (MJF) polymers and their characterization.
Test specimens were designed and fabricated according to established standards. The study is divided into two main parts: the four-point bending test, which measures mechanical characteristics, and the evaluation of surface roughness parameters.
The results show significant correlations between post-processing techniques and both surface quality and mechanical properties of MJF 3D printed parts.
This research highlights the critical role of post-processing in optimizing the performance of MJF 3D printed parts. The findings offer valuable insights for industries seeking to leverage MJF technology for high-performance applications, providing a basis for selecting appropriate post-processing methods to achieve desired outcomes in both surface quality and mechanical robustness.Aquesta tesi té com a objectiu analitzar les propietats superficials i mecàniques de les peces impreses
en 3D després de l’aplicació de diverses tècniques de post-processament. En primer lloc, es revisen
tècniques avançades de fabricació additiva i les seves aplicacions en materials polimèrics per establir
una base teòrica sòlida. A continuació, la investigació se centra en els polímers de HP Multi Jet Fusion
(MJF) i la seva caracterització específica.
Es van dissenyar i fabricar espècimens de prova segons els estàndards establerts. L’estudi es divideix
en dues parts principals: la prova de flexió en quatre punts, que mesura les característiques mecàniques,
i l’avaluació dels paràmetres de rugositat superficial.
Els resultats mostren correlacions significatives entre les tècniques de post-processament i la qualitat
superficial, així com les propietats mecàniques de les peces impreses en 3D mitjançant MJF.
Aquesta investigació ressalta el paper crucial del post-processament en l’optimització del rendiment de
les peces impreses en 3D amb MJF. Les troballes proporcionen perspectives valuoses per a les indústries
que busquen aprofitar la tecnologia MJF per a aplicacions d’alt rendiment, oferint una base per a la
selecció de mètodes de post-processament adequats per aconseguir els resultats desitjats en termes de
qualitat superficial i robustesa mecànica
MJF-14 proximity ligation assay detects early non-inclusion alpha-synuclein pathology with enhanced specificity and sensitivity
Get PDFα-Synuclein proximity ligation assay (PLA) has proved a sensitive technique for detection of non-Lewy body α-synuclein aggregate pathology. Here, we describe the MJF-14 PLA, a new PLA towards aggregated α-synuclein with unprecedented specificity, using the aggregate-selective α-synuclein antibody MJFR-14-6-4-2 (hereafter MJF-14). Signal in the assay correlates with α-synuclein aggregation in cell culture and human neurons, induced by α-synuclein overexpression or pre-formed fibrils. Co-labelling of MJF-14 PLA and pS129-α-synuclein immunofluorescence in post-mortem cases of dementia with Lewy bodies shows that while the MJF-14 PLA reveals extensive non-inclusion pathology, it is not sensitive towards pS129-α-synuclein-positive Lewy bodies. In Parkinson’s disease brain, direct comparison of PLA and immunohistochemistry with the MJF-14 antibody shows widespread α-synuclein pathology preceding the formation of conventional Lewy pathology. In conclusion, we introduce an improved α-synuclein aggregate PLA to uncover abundant non-inclusion pathology, which deserves future validation with brain bank resources and in different synucleinopathies
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