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Laser Plotter for Cutting Steel Plates
Dokulil, Marek ; Šimek, Václav (referee) ; Crha, Adam (advisor)
This diploma thesis is divided into two main parts. The first section is dedicated to the history and development of the laser technology. The second part describes all individual types of laser technology which are used in the industry nowadays. The next section follows with the research of various laser devices which serve mainly as a cutting tool. This knowledge gathered in the previous part was used to create the next part including the own conception of the machine. The second half of this diploma thesis deals with a research of software available at the market today. Eventually, after summarizing the characteristics of each software, the new concept and implementation of own software are made. In the final section, there are mentioned the possible extension and available upgrades. The reader should be able to create his/her own conception of the laser device and software after reading and understanding this paper.
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Optimization of a part production made of a structural 20 mm thick steel using laser cutting technology
Šoukal, Hynek ; Hála, Michal (referee) ; Mrňa, Libor (advisor)
The thesis deals with the optimization of process parameters in the oxidative laser cutting of structural 20 mm thick steel with regard to the type of material, the resulting roughness of the cut and the resulting price of the product. In line with the literary study and the Taguchi method, an experiment was developed. The cutting speed, laser performance, cutting gas pressure, and focal position were controlled during the experiment. Sample sets were cut with 7.5" and 10" focusing lens from the TATA STEEL S355MC and SSAB LASER 355 MC steels. According to ČSN EN ISO 9013, the samples were evaluated for roughness. Then micro and macro structures were evaluated, and compare the hardness according to Vickers. In conclusion, technical and economic evaluation was determined.
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Study of laser mixture in the large pressure region
Morávek, Matěj Jan ; Hrachová, Věra (advisor) ; Kudrna, Pavel (referee)
This work studies discharge plasma in a mixture of gases, similar to that used in the so-called CO2-lasers. This mixture consists of CO2, N2 and He. The effect of the mixture composition and discharge parameters (especially pressure, in the range of 266 Pa - 100 kPa) on the distribution of energy in the vibrational levels of nitrogen was examined. This is important parameter for modelling of the discharge plasma. The effect of the mixture composition on the degree of dissociation of the CO2 molecules was also studied. The relative concentration of CO was applied to find the conditions leading to a minimal dissociation of the carbon dioxide. Measurements of radial profiles were also made. Results from two discharge tubes made from different materials were compared. Two types of discharge were utilized to acquire a wide pressure range - low pressure DC glow discharge in the range of 266 Pa to 1330 Pa and dielectric barrier discharge in the range of 5 kPa to 100 kPa. Both discharges are used in commercial CO2-lasers. We observed a descending dependence of the vibrational temperature on the pressure and a big step caused by increased occurrence of standing ionizing waves in the mixtures with low nitrogen ratio. Vibrational temperature in the DBD was markedly lower than in the DC GD, because of the...
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Comparing roughness of cutting edges in cutting of CO2 and YbYAG laser
Podaný, Petr ; Hála, Michal (referee) ; Mrňa, Libor (advisor)
The bachelor thesis deals with the analysis of cutting edge roughness in the process of laser gas cutting using the CO2 laser and laser solid-state cutting using the Yb:YAG laser. The theoretical part is consists of a basic information on industrial lasers and a their methods which use for material cutting. There is part of describing of problems optimum settings cutting parameters and all of roughness measurement. The experimental part was measurement of 20 samples. Samples were made of structural steel DC 01 a S235JR+N, stainless steel X5CrNi18-10+2B and aluminum alloy AlMg3. In the following part is the description of materials and also laser radiation which was used to production of samples. The end of this bachelor thesis is dedicated to evaluation and place in a folder is ČSN EN ISO 9013.
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Design for Manufacturing of an Assistant Facility for CO2 Laser
Okřina, Lukáš ; Kalivoda, Milan (referee) ; Slaný, Martin (advisor)
The main point of this thesis is a design of an assistant facility for low power CO2 lasers with a focus on a manufacturing process of the supporting metallic parts. The theoretical part of the thesis summarises the general subject-matter of CO2 laser technology, their types and industry utilisation. The thesis includes a review of main characteristics of the available assistant facilities. Main task is to design a construction of a new facility with the consecutive technological manufacturing process. The next part of this design is technical and economic evaluation in connection with mass production.
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Analysis of the surface after laser cutting
Narovec, David ; Sedlák, Josef (referee) ; Osička, Karel (advisor)
This diploma thesis discusses laser cutting and the consecutive surface treatment of cut parts. The theory of laser cutting is described in the first part of this thesis, including laser history and the laser emergence principle. Cut parameters and the influence of the laser cutting on the material are described later on. The next part describes the laser cutting technological possibilities and other laser technology utilization options are outlined. In the last theory part, metal surface treatment used in the experiment is covered. Coating thickness is evaluated in the practical part of this thesis, as well as roughness, microhardness, chemical microanalysis and metalography. The evaluation of the results achieved, and optimal surface treatment execution suggestions are addressed in the last part of this thesis.
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Analisys of the material for laser cutting
Tonkovič, Miroslav ; Kolář, Ladislav (referee) ; Osička, Karel (advisor)
This thesis deals with laser cutting of metal sheets from selected steel producers. The basics of laser technologies, especially in industrial use, are described in the introductory part. There the material requirements are described from the point of view of laser cutting. The comparison of materials from different steel producers is made from different angles in the practical part. The conclusion is dedicated to the evaluation of achieved results.
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Compare weld from CO2 laser and fiber laser
Leidorf, Michal ; Kubíček, Jaroslav (referee) ; Mrňa, Libor (advisor)
The project compares the technology of welding of CO2 laser and fiber laser in terms of engineering study, the welds will be made by same welding conditions on two materials (S235JRG2 a X5CrNi 18-10), by using different protective gases (Helium and Argon). In the terms of literal background research both the technologies and questions of laser welding are described. The geometry of welds is carried out in the experimental part. The final results of the experiment are concluded at the end of the diploma thesis.
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Unstability cut of laser beam at dividing limiting gauge thickness
Kadlec, Zdeněk ; Kalivoda, Milan (referee) ; Osička, Karel (advisor)
This thesis deals with the possibilities of cutting strong steel metal sheets by means of laser and problems rising from the incision, their technological investigation. The basic philosophy consists on the research of the interaction between laser bunch and material, depending on the position of focal poin and sequential results in spec. heat. It determines the main parametres of the incision (from the total quantities and matematical description) which have the biggest effect on the occurence of wide cut and perhaps even on the quality of products and consequential optimalization of these quantities.
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Machines for unconventional methods of machining
Zelený, Radek ; Osička, Karel (referee) ; Kalivoda, Milan (advisor)
This thesis is based on machines for unconventional machining, focusing on laser machining. The beginning of this work is summarized by what are unconventional machining methods that fall into this category and are then described along with their advantages and disadvantages The next section is focusing on laser machining. This chapter deals with machines used for laser machining parts that are convenient for a laser machine, but there is described a process itself that brings a lot of problems, advantages and disadvantages compared to other methods of machining. Finally, various technologies are compared for their suitability and use.
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