Browsing by Subject "3D printing"

Now showing 1 - 14 of 14

Access status: Open Access ,
Assessment of the impact of 3D printed water-lubricated cutless bearings material on vibration parameters
(Wydawnictwa AGH, 2022) Blaut, Jędrzej
The main purpose of the research was to determine the possibilities and experimentally verify the benefits of using thermoplastic materials in a cutless plain bearing. The tested bearings were subjected to equal loads and rotational speeds, using water as the lubricant. Analysis showed that they achieved the best vibration damping at lower speeds, between 600 and 1100 RPM. Comparative studies of bearings made of different materials, such as available on the market bearings made of rubber, bearings printed with a 3D printer from PETG, PLA, ABS or Tribo filament materials, revealed differences in their vibration damping ability and operational stability. Conclusions from the study suggest that higher vibration acceleration may increase the radius of the trajectory, which may affect the function and performance of the bearings. The importance of the operational stability of water-lubricated plain bearings cannot be assessed solely on the basis of the RMS of vibration acceleration or trajectory radius. Both of these parameters are crucial from the user’s point of view, especially in the context of various applications such as electric boats.
Access status: Restricted ,
Badania wpływu absorbcji wody na właściwości wytrzymałościowe poliamidu PA12 wytwarzanego metodą druku 3D SLS
(Data obrony: 2017-09-28) Piasecki, Bartłomiej
Wydział Inżynierii Mechanicznej i Robotyki
Access status: Restricted ,
Badanie przydatności druku 3D do produkcji elementów formowania wiązki na potrzeby przestrzennie frakcjonowanej radioterapii protonowej
(Data obrony: 2018-01-24) Bomba, Paulina
Wydział Elektrotechniki, Automatyki, Informatyki i Inżynierii Biomedycznej
Access status: Open Access ,
Bending and compression properties of ABS and PET structural materials printed using FDM technology
(AGH University of Science and Technology Press, 2017) Szczepanik, Stefan; Bednarczyk, Piotr
The bend and compression mechanical properties of 3D-printed polyethylene terephthalate (PET) and acrylonitrile butadiene styrene (ABS) rectangular and cylindrical specimens (fully-dense and with circular, hexagonal, and rectangular perforations) are presented. In three-point bending, fully-dense PET flexural strength was 69 MPa, yield stress was 48.9 MPa, and yield stress from compression was 31.4 MPa. For ABS, these values were 59, 41.7, and 51.2 MPa, respectively - not significantly different from those of polymers manufactured by common techniques. Whereas perforation reduced density, the strength values were significantly lower, decreased for the circular perforation to a value of 20% strength for the fully-dense specimen. Specific strengths dropped quite significantly for the specimens tested in bending, whereas they did not differ significantly when tested by compression.
Access status: Open Access ,
Druk 3D i mikromodyfikacje stopu Co-Cr-W-Mo. Nowa generacja stomatologii cyfrowej
(Wydawnictwa AGH, 2024) Augustyn-Nadzieja, Joanna; Gut, Wiktoria
The advent of 3D printing technology in the prosthetics sector makes it possible to accurately reproduce a patient’s specific case of missing teeth, without generating material waste. Due to its precision and accuracy, the technique of selective fusion of metal powders DLMS (direct metal laser sintering) is increasingly being used. The research that was carried out within the scope of the presented work consisted in the evaluation of the influence of 3D printing parameter variation and heat treatment on the properties of a dental Co-Cr alloy with tungsten and molybdenum micro-additives. The metallic specimens used in the study were fabricated in the prosthetic laboratory by a dental technician using DMLS technology from Ador’s Co-Cr-W-Mo Adorbond CC metallic powder with a variable 3D printing parameter, i.e. layer printing thicknesses of 20 μm and 30 μm, respectively. The samples were then heat treated (annealed at 1150°C for 1 h). In this study, microstructural analysis using light microscopy (LM) and scanning electron microscopy (SEM) was compared and performed along with microanalysis of the chemical composition using energy-dispersive spectroscopy (EDS) for all the tested samples produced with print layer thicknesses of 20 and 30 μm before and after heat treatment.
Access status: Open Access ,
Generation of large scale robotic 3D printing trajectories and optimization of the quality of pieces
(Wydawnictwa AGH, 2023) Rosoux, François; Appeldoorn, Henri; Garray, Didier; Beeckman, Eric
Incremental sheet forming is used to form metal sheets on massive dies. However, the waste and time lost due to the machining of dies can be a problem for both companies and the environment. Additive manufacturing is thus a potential alternative to classical machining of dies, but these complex geometries could be challenging for classical layer-by-layer 3D printing techniques. This paper will present an innovative process based on a 3D printing technology using 3-axis systems and a pellet extruder combined with the generation of non-planar trajectories in order to achieve good surface quality. PLA-based parts were realised to evaluate surface quality and mechanical properties. With such a technique, the obtained 3D printed parts were closer to the expected CAD geometries and smoother top surfaces were obtained. These improvements have been made possible through the development of specific post-processors and printing strategies in order to replicate the behaviour of a 3D printer at a larger scale, which is a current challenge in robotic 3D printing.
Access status: Restricted ,
Manufacturing solid oxide fuel cell electrodes using 3D printing technology
(Data obrony: 2019-12-12) Wojtas, Gabriel
Wydział Energetyki i Paliw
Access status: Open Access ,
Possibilities of manufacturing spatial elements using the 135 hardfacing method
(Wydawnictwa AGH, 2023) Góral, Tomasz; Krawczyk, Stanisław; Pawlik, Jan
3D printing with thermoplastic materials is slowly becoming commonplace as additive manufacturing has gained a large number of dedicated users over the past few years, and the prices of the requisite equipment have significantly dropped. However, in terms of materials, only plastics have enjoyed this popularity. Although metals are, in a sense, thermoplastic materials, their spatial application would require very advanced setups, which in turn generates high costs and complicates process control. This article discusses the possibilities of the additive manufacturing of metal elements using a three-axis numerically controlled plotter combined with a semi-automatic welding machine using the 135 method. The authors also examined the impact of sudden changes in velocity vectors on geometric deviations.
Access status: Restricted ,
Przygotowanie skanów tomografii medycznej dla potrzeb druku 3D
(Data obrony: 2017-01-23) Tracz, Agnieszka
Wydział Elektrotechniki, Automatyki, Informatyki i Inżynierii Biomedycznej
Access status: Open Access ,
Rapid prototyping of water nozzles using CFD modeling and 3D printing results
(Wydawnictwa AGH, 2023) Buksa, Dominik; Madejski, Paweł; Karch, Michał
In recent years, there has been greater interest in rapid prototyping methods employed in various industries. Prototypes are increasingly often made using 3D printing technology, which is mainly due to the relatively low costs of developing and producing such a structure and the short time needed for their physical production. The work presents the possibility of using rapid prototyping techniques, such as water propulsion nozzles. They are mainly used in the energy industry, e.g. for the production of water mist in jets or condensers. Such nozzles enable the formation of a stream, and its range and efficiency depend on the design requirements. CFD (computational fluid dynamics) tools and 3D printing will be used to assess the nozzle’s effectiveness. A 3D printer based on FDM technology was used to produce nozzle prototypes. The CFD results were verified with experiment. Analyzes for four different nozzle shapes are presented and the discrepancies between the results of the initial experimental and numerical analyses are explained. To indicate the imperfections resulting from 3D printing, a 3D scanner was used to show the internal cross-section of the nozzle. The research conducted indicates the significant potential of 3D printing in rapid prototyping and its effectiveness in creating functional models for various engineering applications.
Access status: Open Access ,
Technology of manufacturing foundry cores using additive methods
(Wydawnictwa AGH, 2017) Matysik, Piotr; Drożyński, Dariusz; Olszowska-Sobieraj, Barbara; Grzegorek, Justyna; Bubrowski, Piotr
The use of additive manufacturing methods for the production of sand cores with organic binders is currently the latest trend in small and unit production, as it allows for a quick and simple way to get a final cast part, this is known as Rapid Prototyping. In this article, manufactured additive method cores were analyzed that were made of quartz sand with furfuryl resin and cores made of synthetic sand. Derivatographic measurements were compared, and examples of the high complexity cores are shown. Furthermore, the aspect ratio of the grains was determined by microscopic observation. Each type of core was characterized by a different flexural strength and differentiated results of abrasion. The results were collected and compared.
Access status: Open Access ,
Testing the suitability of spatial printing technology for engineering applications (for presentation of topographic surface)
(2014) Chmielnicki, Krzysztof; Eckes, Konrad
The final result of the architect´s designing work is the visualization of the project in the form of a drawing or a picture on the screen. Such screen images have many advantages, there are, however, some flaws of this method (of visualization), which makes it necessary to build physical models of the projected objects. The observation of physical models requires no hardware, the observed model is seen using the principles of everyday experience of the observer - as a realistic three-dimensional object and - it can be observed in real time from any site. Moreover, one can directly determine the spatial relationship between its component parts. Physical models can be elaborated manually or using modern printing technology - 3D. Three-dimensional printing technology involves building a model of layers. Subsequent layers are superimposed on each other, but their shape is given in numerical form - according to the programmed design model. The layers are bound together creating a stable physical spatial model. The aim of this study was to use the 3D printing technology to visualize terrain objects. As the source object for testing the 3D printing technology four Krakow mounds have been used. These objects were a well selected experimental basis, both because of the shape of the surface topography, and the associated engineering structures (paths and walls). The source data was obtained from the GNSS measurements and from airborne and terrestrial laser scanning. For the models prepared on the basis of GNSS measurements some inaccuracies of mapping were observed, due to the insufficient number of the source points. The models based on the clouds of points from laser scanning showed high accuracy in reproducing all terrain and engineering details. In conclusion we list the temporary 3D printing flaws like: the time-consuming printing process and the high technology cost. Advantages and possible applications lie in the creation of architectural models and in the renovation of monuments.
Access status: Open Access ,
The influence of furfuryl resin type – classical and designed for sand 3D printing, on cast iron castings microstructure and surface roughness
(2025) Major-Gabryś, Katarzyna; Halejcio, Dawid; Fijołek, Andrzej; Marosz, Jan; Górny, Marcin
Wydział Odlewnictwa
This conference abstract shows the results achieved within NetCastPL4.0 project. The project is being realized in cooperation between AGH Faculty of Foundry Engineering (Leader), CNR-ICMATE and Aalto University School of Engineering. This work, presented during the V International Conference of Casting and Materials Engineering ICCME 25 in Krakow, Poland on October 27-28, 2025, describes the research on molding sands for molds and cores 3D printing. The work concerns the influence of furfuryl resin type (classical and designed for 3D printing) on cast iron castings properties. The pouring parameters were elaborated on the basis of MAGMA software. The microscopic observations of castings, produced in classical and 3D printed molds were conducted as well as roughness of the samples assessment.
Access status: Restricted ,
Zastosowanie druku 3D do modyfikacji topografii powierzchni biomateriałów
(Data obrony: 2018-01-24) Podgórny, Wiktor
Wydział Elektrotechniki, Automatyki, Informatyki i Inżynierii Biomedycznej