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Heat Treatment of Forged Axles
Kaizar, Libor ; Němec, Karel (referee) ; Molliková, Eva (advisor)
This thesis presents a production and heat treatment of forged axles. Additionally, there is the supplier selection procedures for the production of steel axles, mechanical and chemical tests, methods of preservation and packaging of axles. All procedures and technologies that are listed in this work are used in Bonatrans Group Inc., which is in production and processing of axles one of the largest companies in the world.
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The problems of production of railway wheels
Šimčík, Vladimír ; Kubík, Roman (referee) ; Kalivoda, Milan (advisor)
The main idea of this work is especially to make clear the principle of railway wheelset technology, consisting of wheels, axle and other necessary components. Based on available information sources, BONATRANS GROUP a.s. literature, practical advices, experience and knowledge of practical issues, the problems in the manufacture of railway wheelsets and proposals for their elimination will be named.
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Anylytical solver for strength calculation of railway axles
Fišer, Petr ; Náhlík, Luboš (referee) ; Vaverka, Michal (advisor)
This master thesis deals with wheel set axles of rail vehicles, their design and methods of implementation stress analysis. In this work, I created a powered locomotive wheel set: axle and wheel. For the purpose of the design department of the Bonatrans Group a.s. company I developed an analytical solver, which allows creating stress analysis, which will be used for verifying finished design and in addition it allows printing of stress analysis as report for the railway´s offices. Next step was a stress analysis of this design of axle in this analytical solver.
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Development of Long-pitch Corrugation in Curves of Small Radii
Valehrach, Jan ; Kohout,, Martin (referee) ; Lidmila,, Martin (referee) ; Plášek, Otto (advisor)
Throughout the operation, the rails are worn and deteriorate. With the increasing speed of rolling stock, along with higher track loads and especially in the vicinity of major traffic hubs with a higher frequency of trains, defects that did not occur to such an extent before or were not considered to be significant, are brought to the forefront of the concerns of track infrastructure managers. Even though these defects are not directly restrictive to traffic operation, they are, in any case, a source of noise and vibration. One of these defects on the railway track is the micro-geometry defect of the running surface of the railhead. In directional curves with radii of less than 600 m or 700 m, defects known as long-pitch corrugation occur on the inner rail. In curves with 300 m or smaller radii, these waves are so distinct that they are a significant source of noise and vibration. In particular, vibrations affect the track surroundings and the track itself, as they cause other defects in the track structure. This dissertation deals with long-pitch corrugation, focusing on the monitoring of wave generation and development over time. The verification of the possibility to track the development of slip waves over time is the basis for possible future models predicting the development of defects. Numerous measurements of geometric parameters of the track and microgeometry of the railheads, specifically slip waves, have been carried out in the framework of the problem. Using RMS and peak-to-peak methods, the rate of development of defects over time and the relationship with other track parameters were evaluated. Based on the obtained development curves, intervals for further maintenance interventions were estimated. A part of the thesis focuses on the deficiency or excess of cant concerning the development of long-pitch corrugation.
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Methods of control of railway wheels in current technical practice
Ondriašová, Patricie ; Ročňáková, Ivana (referee) ; Juliš, Martin (advisor)
The proposed bachelor´s thesis looks into the inspection methods of railway wheelsets in current technical practice. First there is a description of the railway wheelset and the wheel production procedure. The main part of the thesis describes particular categories of wheel inspection. These are described as destructive, non-destructive and final tests. At the end some cases of wheel failure that happened during operation are stated. Finally there is also an outlook for railway transport in the future.
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The Process of Repair Vheel Set
Vaculík, František ; Prokop, Jaroslav (referee) ; Osička, Karel (advisor)
Diploma work describes in its theoretical part particular types of pairs of wheels used on railway vehicles in Czech Republic as well as their components and assembly instructions. Practical part describes workplace for wheels in reparation DPOV, a.s. at repairing centre Nymburk, its facilities and repairing possibilities by total repair of pairs of wheels. Practical part brings at the end particular report with results of pairs of wheels measuring.
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Renovation of railway wheelsets
Halásek, Jan ; Trčka, Tomáš (referee) ; Kalivoda, Milan (advisor)
This bachelor´s thesis deals with an analysis and a description of railway wheelsets´ renovation. The theme offers a complete view of a technology, conditions and renovations´ posibilities. In the theoretical part, there is mentioned a basic terminology with an overview of all defects and also their removing in the workroom practice. Practical part is illustrated with the technological process of a repaired vehical in the company DPOV, a. s. PSO Nymburk. In the end, there is a summary of all potencial possibilities leading towards improving the functioning of the company with the emphasis on renovation of a components, which nowadays must be eliminated out of operation.
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Methods for the wear determination of a railway wheel
Čížek, Petr ; Prokop, Aleš (referee) ; Řehák, Kamil (advisor)
This bachelor thesis deals with the problem of measuring the wear of railway wheels. Railway wheels are subject to high loads and therefore their profile also suffers from high wear. Early exposure of a damaged wheel can prevent fatal train accidents, and hence there is a need to measure wear not only periodically in laboratory but also in during train operation. Wear measurement methods are currently divided into 3 types, the most developed of which are the on-track and laboratory measurement methods. On-train measurement methods are in most cases only at the study stage due to the difficulty of their application to the train set.
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Development of Long-pitch Corrugation in Curves of Small Radii
Valehrach, Jan ; Kohout,, Martin (referee) ; Lidmila,, Martin (referee) ; Plášek, Otto (advisor)
Throughout the operation, the rails are worn and deteriorate. With the increasing speed of rolling stock, along with higher track loads and especially in the vicinity of major traffic hubs with a higher frequency of trains, defects that did not occur to such an extent before or were not considered to be significant, are brought to the forefront of the concerns of track infrastructure managers. Even though these defects are not directly restrictive to traffic operation, they are, in any case, a source of noise and vibration. One of these defects on the railway track is the micro-geometry defect of the running surface of the railhead. In directional curves with radii of less than 600 m or 700 m, defects known as long-pitch corrugation occur on the inner rail. In curves with 300 m or smaller radii, these waves are so distinct that they are a significant source of noise and vibration. In particular, vibrations affect the track surroundings and the track itself, as they cause other defects in the track structure. This dissertation deals with long-pitch corrugation, focusing on the monitoring of wave generation and development over time. The verification of the possibility to track the development of slip waves over time is the basis for possible future models predicting the development of defects. Numerous measurements of geometric parameters of the track and microgeometry of the railheads, specifically slip waves, have been carried out in the framework of the problem. Using RMS and peak-to-peak methods, the rate of development of defects over time and the relationship with other track parameters were evaluated. Based on the obtained development curves, intervals for further maintenance interventions were estimated. A part of the thesis focuses on the deficiency or excess of cant concerning the development of long-pitch corrugation.
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Methods for the wear determination of a railway wheel
Čížek, Petr ; Prokop, Aleš (referee) ; Řehák, Kamil (advisor)
This bachelor thesis deals with the problem of measuring the wear of railway wheels. Railway wheels are subject to high loads and therefore their profile also suffers from high wear. Early exposure of a damaged wheel can prevent fatal train accidents, and hence there is a need to measure wear not only periodically in laboratory but also in during train operation. Wear measurement methods are currently divided into 3 types, the most developed of which are the on-track and laboratory measurement methods. On-train measurement methods are in most cases only at the study stage due to the difficulty of their application to the train set.
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