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Comparison of properties parameters of laser solid state
Bazalová, Lucie ; Mrňa, Libor (referee) ; Kubíček, Jaroslav (advisor)
The bachelor thesis deals with the characteristics, properties, parameters and application areas of solid-state lasers. It provides the explanation of the principle of laser beam and the associated individual types of lasers. This is followed by a more detailed division of solid-state lasers and their individual applications. Among these applications, more space is devoted to laser welding, where the main objective is to design a laser welding facility for steel welding up to a thickness of 10 mm.
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Current source for the solid-state laser amplifier
Žilka, Martin ; Duz, Aleksei (referee) ; Novák, Lukáš (advisor)
This thesis deals with theoretical design of solid-state laser beam amplifier power supply. The introductory part contains a description of operation principles of some step-down DC/DC converter topologies, including their advantages and disadvantages. The next chapter describes design issues of a DC/DC converter design, including full schematic diagram. The conclusion is focused on practical assembling and testing of the designed device.
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Study of cutting defects in flame cutting of limit thickness of carbon steel by fiber laser
Králík, Petr ; Hála, Michal (referee) ; Mrňa, Libor (advisor)
This thesis deals with research of cutting defects at laser cutting of 15 mm thick carbon steel by Bystronic fiber laser with emphasis on wide cutting gap, which causes enlargement of wide of cutting gap and deterioration of roughness of cutting edge and increase of creation fo heat. The introduction describes the main types of lasers used for cutting sheet of metal and compare their advantages and disadvantages. Also described is a cutting process and its parameters, and also the possible cutting defects. An experiment was conducted on steels S355MC and S235JR and cutting defects were analyzed in relation to the set of cutting parameters. Next part determines the extent of the recommended parameters that should be chosen for specific cutting conditions and is balanced recommendations regarding the choice of material to be cut, and technological adaptations parts. In the last part is measured roughness of a wide cutting gap, the width of the heat affected zone and micro-hardness of the material.
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Influence of process parameters on the roughness of the cut during laser cutting of stainless steel thickness 8 mm
Shkotova, Viktoriia ; Horník, Petr (referee) ; Mrňa, Libor (advisor)
This bachelor thesis deals with optimization of process parameters of laser CNC center. An IPG YLS-5000 solid state fiber laser was used in the experimental section for separating austenitic stainless steel X5CrNi 18-10 thickness 8 mm. Within the optimization, three parameters were changed: power, scroll speed and focus position. For each, a set of 10 samples was created. The roughness measurement and subsequent classification into the tolerance classes was based on ČSN EN ISO 9013. Although the changes in power did not show a bid differences in roughness, the tendency of the surface roughness decreases with the increase in the parameter value. The best results were achieved when the focus position and speed were changed. Samples 41 and 42 have a good surface quality, but there is a burst at the bottom edge. In the real situation, additional operations would be needed to remove them. Sample 61 has the smallest roughness surface without defects, but the cutting speed was almost twice lower than in samples 41 and 42. Because production time is very important from an economic point of view, it would be necessary to calculate the time for all used operations.
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Current source for the solid-state laser amplifier
Žilka, Martin ; Duz, Aleksei (referee) ; Novák, Lukáš (advisor)
This thesis deals with theoretical design of solid-state laser beam amplifier power supply. The introductory part contains a description of operation principles of some step-down DC/DC converter topologies, including their advantages and disadvantages. The next chapter describes design issues of a DC/DC converter design, including full schematic diagram. The conclusion is focused on practical assembling and testing of the designed device.
|
|
|
Influence of process parameters on the roughness of the cut during laser cutting of stainless steel thickness 8 mm
Shkotova, Viktoriia ; Horník, Petr (referee) ; Mrňa, Libor (advisor)
This bachelor thesis deals with optimization of process parameters of laser CNC center. An IPG YLS-5000 solid state fiber laser was used in the experimental section for separating austenitic stainless steel X5CrNi 18-10 thickness 8 mm. Within the optimization, three parameters were changed: power, scroll speed and focus position. For each, a set of 10 samples was created. The roughness measurement and subsequent classification into the tolerance classes was based on ČSN EN ISO 9013. Although the changes in power did not show a bid differences in roughness, the tendency of the surface roughness decreases with the increase in the parameter value. The best results were achieved when the focus position and speed were changed. Samples 41 and 42 have a good surface quality, but there is a burst at the bottom edge. In the real situation, additional operations would be needed to remove them. Sample 61 has the smallest roughness surface without defects, but the cutting speed was almost twice lower than in samples 41 and 42. Because production time is very important from an economic point of view, it would be necessary to calculate the time for all used operations.
|
|
|
Study of cutting defects in flame cutting of limit thickness of carbon steel by fiber laser
Králík, Petr ; Hála, Michal (referee) ; Mrňa, Libor (advisor)
This thesis deals with research of cutting defects at laser cutting of 15 mm thick carbon steel by Bystronic fiber laser with emphasis on wide cutting gap, which causes enlargement of wide of cutting gap and deterioration of roughness of cutting edge and increase of creation fo heat. The introduction describes the main types of lasers used for cutting sheet of metal and compare their advantages and disadvantages. Also described is a cutting process and its parameters, and also the possible cutting defects. An experiment was conducted on steels S355MC and S235JR and cutting defects were analyzed in relation to the set of cutting parameters. Next part determines the extent of the recommended parameters that should be chosen for specific cutting conditions and is balanced recommendations regarding the choice of material to be cut, and technological adaptations parts. In the last part is measured roughness of a wide cutting gap, the width of the heat affected zone and micro-hardness of the material.
|
|
| |
|
|
Comparison of properties parameters of laser solid state
Bazalová, Lucie ; Mrňa, Libor (referee) ; Kubíček, Jaroslav (advisor)
The bachelor thesis deals with the characteristics, properties, parameters and application areas of solid-state lasers. It provides the explanation of the principle of laser beam and the associated individual types of lasers. This is followed by a more detailed division of solid-state lasers and their individual applications. Among these applications, more space is devoted to laser welding, where the main objective is to design a laser welding facility for steel welding up to a thickness of 10 mm.
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