National Repository of Grey Literature 71 records found  1 - 10nextend  jump to record: Search took 0.00 seconds. 
Modification of inert atmosphere circuit of 3D printer SLM 280HL
Somora, Jakub ; Maňas, Pavel (referee) ; Koutný, Daniel (advisor)
The diploma thesis deals with the design modification of the circulation circuit of inert atmosphere in the 3D printer SLM 280HL. The aim of the proposed modifications was to increase the efficiency of condensate and flue gas removal and thus increase the quality of the production process. Based on experimental measurements of the velocity field at a height of 12 mm, it was found that in the original configuration of the build chamber, there are sites with reduced flow velocity. The test subsequently confirmed the increased porosity of the samples in the given localities. Subsequently, with the help of CFD simulations, a lower flow distributor was designed, which had the most significant effect on the porosity. Furthermore, an additional outlet and flow deflector were designed, which had the task of streamlining the drainage of condensate and fumes from under the protective glass of the laser. The designed components were manufactured and experimentally verified, which was able to prove the flow improvement and reduce the porosity on the platform. A test was also performed with a magnesium-based material, which proved more efficient removal of condensate and flue gases. The work managed to prove the influence of the flow velocity on the porosity of the component at differences in flow velocities above 0,3 ms^-1.
The development of multimaterial 3D printing of metal parts by SLM technology
Pliska, Jan ; Dočekalová, Kateřina (referee) ; Koutný, Daniel (advisor)
This thesis deals with research and optimization of process parameters and methodology of production of multimaterial parts manufactured by SLM. This work investigates iron-based and copper-based materials. The aim of the work is to create a good-quality horizontal and vertical multimaterial interface. In the case of the horizontal interface, the optimal process parameters for the processing of selected materials, their subsequent optimization for a goodquality horizontal interface and verification of mechanical properties were experimentally determined. For the vertical interface, it was necessary to design a production methodology and further optimize the process parameters. Finally, some mechanical properties of the interface were determined. However, research of the vertical interface has been a scientific task with some degree of uncertainty, and as this area has not yet been fully explored, it has proved to be a more complex problem than previously thought. It was therefore not possible to completely clarify it in the given time and with the available means. This work provides a detailed description of the mechanisms of creating both types of interfaces and their properties and can serve as a basis for further study of multimaterial 3D printing of metals based on iron and copper.
Design of Stationary Machine for Threadig Plastic Sheathing on Wide Bandsaw Blades
Riedl, Jan ; Vespalec, Arnošt (referee) ; Koutný, Daniel (advisor)
This thesis deals with the design of a machine for threading plastic sheathing on single-sided band saw blades with dimensions from 4500 x 80 x 1.0 mm to 12500 x 290 x 1.85 mm. The aim of the thesis is to create an assembly model, the text is focused on a detailed description of the machine. The device was designed in SOLIDWORKS software. The main goal and partial goals of the thesis were met. The thesis is developed to the level of structural design and assembly description, along with calculations of key parts in the structural solution. The method of operating the machine is outlined. The thesis can serve as a starting point for future designs of a machine for threading protective plastic sheathing on saw bands of the stated dimensions.
Design of non-resonant sample holders
Lagiň, Adam ; Koutný, Daniel (referee) ; Sojka, Antonín (advisor)
Paramagnetické látky a nano-elektrické zariadenia môžu nájsť uplatnenie pri vývoji kvantových počítačov, vysokokapacitných úložísk dát, detektorov žiarenia a iných zariadení. Vysokofrekvenčná elektrónová paramagnetická (VF-EPR) spektroskopia je vedecká disciplína skúmajúca, štrukturálne a magnetické vlastnosti týchto látok. Témou tejto práce je návrh nerezonančných držiakov pre VF-EPR spektrometer určených pre rôzne typy vzoriek, najmä peliet z lisovaného prášku a nano-elektrických zariadení umiestnených na čipe. Výsledkom práce sú tri kalibrované prototypy držiakov, ktorých funkčnosť je otestovaná meraniami.
Design of experimental 3D printer for concrete
Kafka, Richard ; Hurník, Jakub (referee) ; Koutný, Daniel (advisor)
This bachelor thesis deals with a structural design of 3D printer for concrete used for printing building elements which cannot be made by traditional methods. Printer allows testing new building materials and their structure in a part of 3D printing. In the thesis, the research was conducted into existing 3D concrete printing methods and kinds of printers. Next follows description of main parts of printer and their types. In the second chapter is analysed knowledge described in the previous chapter and based of the findings is chosen the most appropriated solution. The design part of the thesis specifies three types of conceptual solutions which are compared with multiple aspects and one of them is selected. The following chapter contains a detailed design of the selected conceptual solution, where positioning systems, linear guides and drives chosen based on the forces and moments arising during printing. The result is a frame printer design using a portal system of three mutually perpendicular axes. Due to its size, the printer can be placed outdoors or in a production hall.
Heat treatment of aluminum alloy AlSi7Mg0,6 fabricated by metal 3D printing
Zabloudil, Jan ; Malý, Martin (referee) ; Koutný, Daniel (advisor)
Author tries to obtain new information about the influence of different heat treatments on SLM fabricated AlSi7Mg0,6 alloy, its mechanical properties and residual stress. For this purpose were chosen parameters of heat treatment based on previous research of other authors. With the use of normalised tensile strength test specimens and special specimens for analysis of deformation caused by the residual stress were the influences studied. Author checked the influence of stress relieving annealing, parameters of precipitation hardening and artificial ageing on mechanical properties and residual stress in the material. Results can help fabrication of studied material to receive required properties and eliminate the deformation caused by the residual stress.
Design of controlled nozzle for high pressure RIM head
Sýkora, Petr ; Suchý, Jan (referee) ; Koutný, Daniel (advisor)
This bachelor thesis deals with the design of mixing nozzle regulation for high-pressure mixing machine for production of polyurethane products. The aim of this work is to design the construction of controlled mixing nozzle for mixing head Cannon while keeping interchangeability with the current nozzle. I solved the chosen goal by constructing a nozzle controlled with the same build dimensions by a stepper motor. Control is ensured by throttling the flow by turning the nozzle screw through the motor. We managed to create a functional prototype and create a table to convert the existing nozzle diameters to the rotation of the engine. The main benefit of this work is the creation of an automatically regulated nozzle required for fully automated machine operation.
Design of additively manufactured oil-water heat exchanger for formula student
Březina, Josef ; Dočekalová, Kateřina (referee) ; Koutný, Daniel (advisor)
Diploma thesis deals with a design and manufacture of oil cooler by technology Selective Laser Melting for Formula Student. The main goal of the design is to ensure optimal oil circuit cooling at a minimal mass. The design of manufactured oil cooler is based on a plate heat exchanger concept with optimized intakes by CFD simulations and heat exchange body with fins of thickness 0.17 mm. An analytical model was created. SLM process parameters were optimized for a thin walls printing, Subsequently, a fabrication of testing parts was finished for measuring pressure drops and performances of micro heat exchangers. Results were used for an accuracy improvement of the analytical model and for consequent optimization of heat exchange surface. Afterwards optimization was executed for inlets and outlets by using flow simulations. A prototype was built and verified on a test stand. Performance of the designed oil cooler is 4.5 kW for race mode, where temperature drop of oil circuit is 22 °C. The lightweight design weighs 320 g, which reduces more than 47 % of a current oil-air cooler weight. Furthermore, a centre of gravity is decreased by designed placement of the cooler.
Design of recoating system for processing of two metal powders using 3D Printing
Guráň, Radoslav ; Němeček, Stanislav (referee) ; Koutný, Daniel (advisor)
The thesis deals with the design, construction and testing of two different metal powder coating equipment, which is able to work with SLM 280HL metal 3D printer. Since the field of multimaterial metal printing by selective laser melting (SLM) has not been significantly investigated yet, an overview of existing patents and possible approaches to the solution has been developed. The device has been successfully designed and a series of tests was carried out defining the issue of applying an improved head that uses a nozzle and an eccentric vibration motor. Based on the experiments performed, the coating parameters of the multimaterial layer of FeAm and 316L materials were defined. A control system for the partial process automation was created for the proposed device. The device was implemented in a printer that demonstrated both the ability to apply a single multimaterial layer of at least 50 m thickness, and the ability to produce a 3D multimaterial component comprised of up to 200 layers and containing material change across all axes.
Thermal conductivity of Cu7.2Ni1.8Si1Cr copper alloy produced via SLM and ability of thin-wall structure fabrication
Mašek, Jakub ; Koutný, Daniel ; Popela, Robert
Selective Laser Melting (SLM) as part of the Additive manufacturing industry is a metal printing technology that is considered promising to address the thermal integrity defects of a Heat Switch – the space technology currently under development. However, no thermal conductivity data of SLMed copper alloy Cu7.2Ni1.8Si1Cr are freely available. Therefore, three parts were fabricated and tested in an experimental thermo-vacuum chamber to reveal the material thermal conductivity. The samples analogous to the Heat Switch components were: a disk with inner holes and two cylinders with thin-wall web of 0.325 mm and 1.625 mm. Based on the previous experience with the copper alloy, fabrication was successfully processed with up to 5 % dimensional accuracy according to CAD model. The thermal conductivity evaluation process was improved by the implementation of heat transfer by radiation and the calculated thermal conductivity of SLMed Cu7.2Ni1.8Si1Cr was 3.4 times lower than the value of bulk material AMPCOLOY 944 with a similar chemical composition.

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