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Laser cutting with air pressure assistance
Kramoliš, Lukáš ; Hála, Michal (referee) ; Mrňa, Libor (advisor)
This project, elaborated within the engineering studies (code of field of study: N2301), deal with air supported laser cutting and its practical usage in industry. The project is divided into theoretical and experimental sections, consisting of detailed description of several successive steps of the experiment. The theoretical section describes the principle and function of laser, individual types of lasers and their classification, laser beam properties, laser cutting, etc. The practical part is focused on finding of a set of optimal cutting parameters, assessment of results of air supported laser cutting in terms of quality and accuracy of cutting surface. This part is followed by comparison of cutting surfaces with a conventional technology of laser cutting that uses oxygen and nitrogen. Final part of the project evaluates applicability of this unconventional technology from the economic point of view.
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Use of laser scanning head for surface hardening
Jedličková, Veronika ; Sigmund, Marian (referee) ; Mrňa, Libor (advisor)
The diploma thesis addressed the issue of laser surface hardening using dynamic oscillation of the laser beam. The theoretical part presents the hardening technology and suitable using of laser equipments. The fiber laser YLS 2000 was used in the experiment and the hardened material was steel 12 050, which is suitable for laser hardening. The influence of two selected parameters of the scan head on the resulting structure and hardness of hardening layers was examined. Based on the results, the choice of optimal parameters for identical conditions with the experiment was recommended.
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Measurement of roughness of the laser cutting edge
Pokorák, Milan ; Hála, Michal (referee) ; Mrňa, Libor (advisor)
This thesis primarily deals with the laser material cutting and with the subsequent evaluation of roughness of the cutting edges. The thesis is divided in two parts, the theoretical part followed by the practical one. The theoretical section is concerned with the introduction to laser technology and with the basics of roughness measurement. It contains the history of laser, its construction and its physical principle. It also deals with the description of laser types and laser technologies. An important part is about the surface texture, which includes basic terms and methods of roughness measurement. The practical section is concerned with the comparison of roughness of the cutting edges. They were measured on S235JR steel samples with the value declared in ČSN EN ISO 9013 standard. This part contains the measurement results, the measured material and also machines and devices used. The overall evaluation of the practical measurement is mentioned in the final experiment outcome evaluation.
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Use of laser machines for engraving
Bernátek, Vojtěch ; Dvořák, Jaromír (referee) ; Slaný, Martin (advisor)
The diploma thesis covers laser engraving machines topic. In the theoretical part, it briefly covers laser technology and laser engraving in general. It also mentions history of laser engraving, especially rise and development of the laser itself, laser engraving, as well as characteristics of laser engraving machines. A description of laser engraving machines parts and the working principles of laser technology as such are also included. All objects and materials suitable for laser engraving are also described is the thesis. Furthermore, comparison of laser engraving and other traditional methods of micro machining or surface treatment in general is depicted. In the practical part, thesis deals with the goal of finding the exact corrections on the laser engraving machine necessary to be made when using swing method. Major advantage of this method is its time saving ability during the engraving process, but the corrections mentioned above are needed as inaccuracies emerge due to the kinematics and dynamics of the machine. Last, but not least, ascertained corrections were plotted into a graph and a sample product was engraved using the corrections found.
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Overview documentation of notches produced by laser burning technology into pipe bodies within the project TK01030108 (NEMENUS)
Štefan, Jan
This technical report has been prepared within the project DP_04_02_04: Research of applicability of modern SHM (Structural Health Monitoring) systems for increasing reliability and economic efficiency of nuclear power plant operation (existing, new and small modular reactors). The purpose of this report is to provide an overview documentation of the experience with laser technology, which has been successfully applied in the previous TAČR project TK01030108 (NEMENUS project, 2020 and 2022) for the production of notches into pipe test specimens, and which is expected to be advantageously used also in the experimental program of the current project. The information gathered in this document will help in the specification of the assignment to the provider of this service (ATG, s.r.o.), and in the optimization of the laser parameters for the purpose.
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SMV-2022-51: ABBrob-expertise
Mrňa, Libor
Consulting and training in the field of laser performance technologies - assessment of the technology of a robotic workplace for laser cutting of plastic products in the company Atrea.
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Use of laser machines for engraving
Bernátek, Vojtěch ; Dvořák, Jaromír (referee) ; Slaný, Martin (advisor)
The diploma thesis covers laser engraving machines topic. In the theoretical part, it briefly covers laser technology and laser engraving in general. It also mentions history of laser engraving, especially rise and development of the laser itself, laser engraving, as well as characteristics of laser engraving machines. A description of laser engraving machines parts and the working principles of laser technology as such are also included. All objects and materials suitable for laser engraving are also described is the thesis. Furthermore, comparison of laser engraving and other traditional methods of micro machining or surface treatment in general is depicted. In the practical part, thesis deals with the goal of finding the exact corrections on the laser engraving machine necessary to be made when using swing method. Major advantage of this method is its time saving ability during the engraving process, but the corrections mentioned above are needed as inaccuracies emerge due to the kinematics and dynamics of the machine. Last, but not least, ascertained corrections were plotted into a graph and a sample product was engraved using the corrections found.
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Use of laser scanning head for surface hardening
Jedličková, Veronika ; Sigmund, Marian (referee) ; Mrňa, Libor (advisor)
The diploma thesis addressed the issue of laser surface hardening using dynamic oscillation of the laser beam. The theoretical part presents the hardening technology and suitable using of laser equipments. The fiber laser YLS 2000 was used in the experiment and the hardened material was steel 12 050, which is suitable for laser hardening. The influence of two selected parameters of the scan head on the resulting structure and hardness of hardening layers was examined. Based on the results, the choice of optimal parameters for identical conditions with the experiment was recommended.
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