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Snow chains manufacturing
Bořek, Pavel ; Kubíček, Jaroslav (referee) ; Císařová, Michaela (advisor)
This thesis is aimed at investigating the snow chain manufacturing process with a closer focus on the problematic spot related to the heat affected zone, weld and base metal. In the theoretical part, the issue of resistance welding and the metallurgical processes involved in the formation of a resistance weld are described for a better understanding of the nuances in the practical part where a structural analysis of the weld area in terms of microstructure, macrostructure and hardness is carried out. For this part, chain samples after welding, carburizing, quenching, tempering and zinc electroplating are used.
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Design of the robotic work cell for the spot welding
Hrubeš, Kryštof ; Szabari, Mikuláš (referee) ; Bražina, Jakub (advisor)
This work deals with the design and creation of a virtual simulation of a robotic workplace for spot welding in the Tecnomatix Process Simulate. The aim of the work is to get acquainted with the issues of robotic workplaces, especially in the field of spot. Then, based on this knowledge, design a robotic work cell for welding two sheets. The whole process will then be simulated in the Tecnomatix Process Simulate and this simulation will serve as a demonstration in teaching.
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Certification of company according to ČSN EN 15085 and ČSN EN ISO 3834
Kazdera, Tomáš ; Daněk, Ladislav (referee) ; Kubíček, Jaroslav (advisor)
The project elaborated in frame of engineering studies is focused on the certification of the company SW-MOTECH sro in the welding of steel structures for rail vehicles. According to standards ČSN EN 15085 and ČSN EN ISO 3834. The first part focuses on theoretical introduction to the used welding methods. The second section describes the destructive and non-destructive tests on individual welding methods, including their evaluation. Based on work tests pWPS is exposed to welding procedure WPS
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Strength point connections in the soft and hard mode welding
Steiner, Jaromír ; Kubíček, Jaroslav (referee) ; Kandus, Bohumil (advisor)
Spot welding of 1.4307 material of 1+1 mm thickness is tuned out excellently by the enterprise ROSTEX – at the changes only of the welding current it was managed to approach the value of thickness achieved by enterprise ROSTEX. At the welding of 1.4307 material of 2+2 mm thickness it was managed to achieve more strength under welding parameters: Fs = 5500N, Is = 8,964 kA, ts = 10 Per. Spot welding of 1.0330 material revealed a possibility in proceeding with welding current increasing which could stand for the weld strength increasing (not necessarily) – a limit where material could splash was not achieved. The soft mode welding is not convenient for up-to date spot welding because the material is extremely affected by heat at the long welding time, it also leads to huge thermal losses, thermal effect and distortion of electrodes (electrodes life diminishing). Soft mode welding is not expedient even economically. In accordance with economic comparison, see chart 27, page 64 – for instance welding of 1.4307 material with 1+1 mm thickness at 1000 welds there is difference of 644 Czech crowns between the hard and the soft mode welding in benefit to the hard mode.
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Design of welding cell
Šuba, Marek ; Kočiš, Petr (referee) ; Vetiška, Jan (advisor)
The topic of this bachelor's thesis is the design of a robotic cell for spot resistence welding of sheet metal parts. The base of this thesis will be the research of industrial robots, spot welding guns, welding fixtures, robot grippers, sensors and safety precautions used in such robotic cells. Second part of the thesis contains few concepts regarding the robotic cell itself and the choice of the best one for the situation at hand. Third part of the thesis contains the choice of welding guns, construction of the welding fixtures and possibly even robot grippers for the given metal sheet parts. In the last part of the thesis comes the simulation of the welding process in RobotStudio (software from ABB), check whether the robotic cell meets the requested production time needed and a final assessment of the results.
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Operation of a distribution system with resistance welders
Zelený, Miroslav ; Šlezingr, Jan (referee) ; Drápela, Jiří (advisor)
This Diploma thesis deals with assessment of the influence of two fundamental types of resistance welders operation on chosen power quality parameters at the point of common coupling (PCC) of the power network. The assessed parameters of power quality are the total harmonic distortion of the supply voltage, asymmetry of the supply voltage and the level of short term flicker at the point of common coupling. The assessment is based on the comparison of the results of computer simulations done in PSCad 4.2.0 with the requirements of technical standards. The outcome of this thesis is the determination of allowable limits for physical and operation parameters for the general arrangement of a power distribution network and a resistance welder that should guarantee the power quality compliance.
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A new design and technology of the low-pressure output part
Sláma, David ; Slaný, Martin (referee) ; Píška, Miroslav (advisor)
The aim of this work is make a new design and technology of the low-pressure output part of rail which is made in BOSCH DIESEL s.r.o. company. In the thesis is analyzed in detail the bending test, which is part of the quality control of the low-pressure welding joint. In the next part of the thesis is proposed the process of machining of this component, followed by experimental finding of welding parameters for resistance welding. Then several pieces are welded, which are measured and tested. The results of this tests are compared with customer requirements. Finally, a technical and economic evaluation of the change is made, which will save a considerable amount of money for the company.
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Proposal of test equipment/method for quick verification of quality of welded joints
Zejda, Václav ; Hála, Michal (referee) ; Kubíček, Jaroslav (advisor)
This bachelor’s thesis is dealing with the proposal and the choice of the proper method for quick check of weld seams of ball pivot of automobile stabilizers created by the resistance welding method. The first, theoretical part deals with the resistance welding. The second part deals with a description of the production process and testing of the particular component. The last part contains personal proposals and an assessment of the suitability of use of each construction solution of simple mechanical devices for quality checking of the weld seam. The recommended method to use is the Charpy impact test which served as the base for designing the special test device.
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Machining threading holes with cutting operation, pressing and shaping.
Rybář, Pavel ; Sedlák, Josef (referee) ; Kalivoda, Milan (advisor)
This project wrought in terms of bachelor studies program 2307 submits a proposal of technology of production internal thread in thin-walled components. Selection of technology is done on the basis of three basic methods evaluation – welding nuts, riveting nuts and thermal shaping. On the basis of literary studies the optimal application is proposed. There is reduced choice of tools and assembly equipment used only for one type of technology. The choice of fastening parts material is possible done in conformity with product material, thread strength according to whole construction or design engineer choice. For proper choice of technology there are technical data sheets of fastening parts and description of thread mechanical properties.
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Design of the robotic work cell for the spot welding
Hrubeš, Kryštof ; Szabari, Mikuláš (referee) ; Bražina, Jakub (advisor)
This work deals with the design and creation of a virtual simulation of a robotic workplace for spot welding in the Tecnomatix Process Simulate. The aim of the work is to get acquainted with the issues of robotic workplaces, especially in the field of spot. Then, based on this knowledge, design a robotic work cell for welding two sheets. The whole process will then be simulated in the Tecnomatix Process Simulate and this simulation will serve as a demonstration in teaching.
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