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Advanced laser diagnostic systems to measure flow field
Loutocký, Petr ; Lízal, František (referee) ; Jedelský, Jan (advisor)
The aim of this work is to give readers a comprehensive view of the present laser methods for measuring the velocity of fluid flow. The methods are classified and compared according to various criteria. Individual techniques are briefly outlined their principles of measurement, options and range of applications. Furthermore, this work discusses the advantages and disadvantages, appropriate areas of application and the basic parameters. At the end we can find a sample analysis of data measured by one method.
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CNC Applications for Laser Cutting
Hruška, Daniel ; Žák, Ladislav (referee) ; Řiháček, Jan (advisor)
The following thesis deals with the theory of laser. In the first part, the thesis is focused on the issue of laser cutting (laser principle, cutting methods, laser division). Furthermore, the thesis is focused on basic theory of automation and NC/CNC control of machines. In the experimental part, the BUT logo was burned out with CO2 laser with the help of the company UnionOcel s. r. o.
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Evaluation of Surface Quality When Using AWJ And WJM Cutting Methods
Pecháček, Martin ; Dvořák, Jaromír (referee) ; Slaný, Martin (advisor)
This study deals with technology of abrasive water jet material cutting and influence of cutting head feed rate on surface topography of cut walls with regards to roughness. Eight parameters were chosen based on the CSN EN ISO 4288 standard representing quality of surface after AWJ cutting. When AWJ cutting the chosen material – commercially pure ASTM B265 grade 2 titanium – feed rate was being changed and in order to obtain information about each parameter´s distribution in various depths of the cut, surface composition was evaluated. It was found out that feed rate has significant influence on surface and that the profile elements´ width grows when increasing the feed rate and cut depth. Furthermore, two selected feed rate results were compared to laser beam technology and conclusion for the selected material was made that AWJ cutting is more preferable due to final roughness and no heat affect on the material.
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A laser beam in engineering
Šustr, Michal ; Kalivoda, Milan (referee) ; Osička, Karel (advisor)
The bachelor thesis focuses on the use of laser beam in the conditions of contemporary engineering, especially in cutting. Emphasis is put on the current technological possibilities of laser in industry, which are described in more detail. Cutting, welding, marking, surface cleaning and hardening, 3D metal printing and surfacing, all using laser beam, is mentioned in the bachelor thesis. The conclusion of the thesis is devoted to the productivity of work with the capacity of the laser together with the balance of operating and maintenance costs.
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The study of the influence of process parameters on the roughness of the cut for flame laser cutting of stainless steel
Kučera, Václav ; Hála, Michal (referee) ; Mrňa, Libor (advisor)
Thesis presents a study of the influence of process parameters on the roughness of the cut surface. The test material is 1.4301, namely austenitic stainless steel. When a parameter is the surface roughness not change too much. In some samples there were defects in the form of cutting burrs. The graphs below show the estimated minimum change one parameter (the lowest point of the curve). As the most important parameter from a technological point of view, cutting speed, constitutes a major cost item compared to the auxiliary gas and power. For samples with a thickness of 2 mm and 3 mm has been achieved good results with decrease in the cutting rate of 30% percent, although when cutting the samples with a default rate was almost identical results. For samples with a thickness of 3 mm the best results were achieved by increasing the speed by 30 %, decrease the rate should be compared with the economy of the process to reduce surface roughness. For changes in the gas pressure was achieved the best values at a pressure increase of 30 %. When you change the performance of the best results are achieved by setting 100–90 % capacity.
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Digitalization of the optical intensity distribution scanning
Škrob, Robin ; Hudcová, Lucie (referee) ; Křivák, Petr (advisor)
This Master’s thesis solves a design and construction of device for gathering and transfer of data into computer. The device should replace graph plotter, by which is measured the optical intensity of a laser beam. From this characteristic it is possible to determine other parameters of the laser beam, such as halfwidth of the beam, angle of divergence and Rayleigh length. The described device - “data gatherer” - measures two voltage values – voltage detected on photodiode and voltage detected on distance moved by photodiode. Measured values of voltage are processed and sent through a serial line into the computer. A pre-amplifier is connected to the control part for both channels of measured values with possibility of amplification. Computer application, which performs graphic interpretation of the measured values, serves as user control peripheral. The product of this project is compact device operating under OS Windows with graphic output.
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Rotary flash hardening with help of electron beam and laser radiation
Klusáček, Martin ; Jan, Vít (referee) ; Kouřil, Miloslav (advisor)
This master thesis deals with surface hardening of steels, especially with rotary flash hardening of 42CrMo4 steel (WNr 1.3563, ČSN 15142). In this method homogenous heating of whole surface occurs during a very fast rotation of the component. In the theoretical part of this thesis the most common methods of surface hardening are described, with focus on laser and electron beam technologies. In the experimental part special device for this application was constructed. Rotary flash hardening was done using different radiation source and experimantal device parameters. The hardened surface layer of maximal thickness of 0,7 mm and width of 5,6 mm was achieved using laser beam. Results with electron beam were way better, because this technology allows to control the distribution of power along the beam width in order to improve the width/thickness ratio of hardened layer. Using this method maximal layer thickness of 1,4 mm and width of 13,4 mm was achieved.
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A laser beam in engineering
Šustr, Michal ; Kalivoda, Milan (referee) ; Osička, Karel (advisor)
The bachelor thesis focuses on the use of laser beam in the conditions of contemporary engineering, especially in cutting. Emphasis is put on the current technological possibilities of laser in industry, which are described in more detail. Cutting, welding, marking, surface cleaning and hardening, 3D metal printing and surfacing, all using laser beam, is mentioned in the bachelor thesis. The conclusion of the thesis is devoted to the productivity of work with the capacity of the laser together with the balance of operating and maintenance costs.
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CNC Applications for Laser Cutting
Hruška, Daniel ; Žák, Ladislav (referee) ; Řiháček, Jan (advisor)
The following thesis deals with the theory of laser. In the first part, the thesis is focused on the issue of laser cutting (laser principle, cutting methods, laser division). Furthermore, the thesis is focused on basic theory of automation and NC/CNC control of machines. In the experimental part, the BUT logo was burned out with CO2 laser with the help of the company UnionOcel s. r. o.
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Rotary flash hardening with help of electron beam and laser radiation
Klusáček, Martin ; Jan, Vít (referee) ; Kouřil, Miloslav (advisor)
This master thesis deals with surface hardening of steels, especially with rotary flash hardening of 42CrMo4 steel (WNr 1.3563, ČSN 15142). In this method homogenous heating of whole surface occurs during a very fast rotation of the component. In the theoretical part of this thesis the most common methods of surface hardening are described, with focus on laser and electron beam technologies. In the experimental part special device for this application was constructed. Rotary flash hardening was done using different radiation source and experimantal device parameters. The hardened surface layer of maximal thickness of 0,7 mm and width of 5,6 mm was achieved using laser beam. Results with electron beam were way better, because this technology allows to control the distribution of power along the beam width in order to improve the width/thickness ratio of hardened layer. Using this method maximal layer thickness of 1,4 mm and width of 13,4 mm was achieved.
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