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The manufacturing process of the ball joint
Petříček, Vít ; Majerík, Jozef (referee) ; Kalivoda, Milan (advisor)
This bachelor thesis deals with the general introduction of the component "ball joint", its construction requirements and production. Two technological processes for the production of a particular spherical pin were selected and presented, namely the production of a cold-forming and a machining. Both methods are compared with each other and their suitability for serial production is assessed. In the final part there is generally shown the technological process of production of the ball pins of the car control.
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History of Iron and steelworks Třinecké Železárny
Niemczyk, Roman ; Němec, Karel (referee) ; Věchet, Stanislav (advisor)
The bachelor´s thesis is a technical summary and it is describing the history of Třinecké železárny since its creation in the 1850s to the present. The history of iron processing is briefly described. Furthermore, the thesis focuses to manufacturing process of Třinecké železárny and also to iron and steel production technology. At the last part are decribed typical products of Třinecké železány and future prospects of ironworks.
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Manufacturing of tubes by rolling
Šimůnek, Petr ; Řiháček, Jan (referee) ; Podaný, Kamil (advisor)
Thesis is focused on the analysis of various rolling methods used for production of seamless tubes. It is a literary study, which describes both methods for the production hollow thick-walled cylindrical billets, as well as methods for their processing into finished tubes. Comparison between them and practical use is also described. In the thesis are analysed the methods of production of hollow semifinished products by push rolling and cross rolling, e.g. Mannesmann and Stiefel methods. For the seamless tubes finishing various rolling methods are described, such as pilger mill, mandrel mill, plug mill, Assel mill, Diescher mill or pushing mill.
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Aging and possibilities of its removal
Kolena, Robert ; Šlais, Miroslav (referee) ; Podaný, Kamil (advisor)
Thesis elaborates on current study of aging issues and describes its development caused by interstitial nitrogen and carbon atoms. It also points out how properties of materials are influenced. There are several removal options. The first one is heat treatment consisting of recovery and recrystallization annealing, the second one is binding of nitrogen atoms to chemical elements with higher affinity and third one is rolling with realization of small plastic deformation. Overall assessment and practical examples are also added.
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Analýza soustav 6-ti těles s vazbami s pasivním účinkem
Krček, Aleš ; Marcián, Petr (referee) ; Fuis, Vladimír (advisor)
This bachelor thesis deals with analysis of the systém of six solids with links with passive effect. The first part deals with theory which includes basic terms of statics, description and characteristics of the neutral and passive links. The second part comprises of two examples that the influence of passive effects on the motional state are demonstrated on. Aim of each example is the calcuation of contact forces in links and the evaluation of function of links and the motional state. The solution is carried out with the computing software MATLAB.
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Production of seamless rings by technology radial-axial rolling
Zapletalová, Martina ; Lidmila, Zdeněk (referee) ; Podaný, Kamil (advisor)
The thesis is focused on the production of a seamless ring manufactured from low-alloyed steel 15 142, which fills the function as a large-dimensional bearing. On the basis of suitable production technologies analysis, the radial axial rolling method was chosen and a specific manufacturing process was proposed. During the manufacturing time, the creation of the forging defects in the transfers forms were occurred, which was totally undesirable. By changing the parameters of the machine, in particular the rolling curve and the temperature, the process was optimized and the production performed completely without defects.
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Boundary Conditions in the Roll Gap during Hot and Cold Rolling
Luks, Tomáš ; Pernis,, Rudolf (referee) ; Hajduk, Daniel (referee) ; Horský, Jaroslav (advisor)
Boundary conditions in the roll gap play an important role in modelling of rolling processes. In the roll gap we can observe the following: changes of rolling pressure, changes of relative velocity, influences of oxides and lubrication, etc. When taking into account all conditions mentioned above the determination of the boundary conditions is not trivial and extensive measurements are necessary. Therefore, this thesis is dealing with design of temperature and force sensors specified for the determination of friction coefficient and heat transfer coefficient in contact. The temperature sensor with an installed thermocouple measures subsurface temperature for a given depth; and then the inverse heat conduction task is used to compute temperature and heat flux on the surface. Several temperature sensors were designed and used for measuring in pilot mill and industrial rolling mill as well. The thermal responses of different sensors were compared in the numerical simulations. The inverse calculations were tested for various rolling conditions. A durability of the sensors was also studied in industrial rolling conditions. The contact stresses in the roll gap were measured by a pin, which was in direct contact with the rolled material. The forces on the top of the pin were measured by a three-axes piezoelectric force transducer and recalculated to the contact stress and friction coefficient. The sensor was implemented in a work roll and tested when rolling aluminium and steel slab for different rolling conditions. The results were compared with the integrative force sensor ROLLSURF.
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Manufacturing of semifinished products
Janáček, Adam ; Šlais, Miroslav (referee) ; Podaný, Kamil (advisor)
This thesis deals with manufacturing of semi-finished products specifically with methods of metal forming and welding and describes their principles and limits. Almost every types of semi-finished products are manufactured by rolling. Drawing is method for manufacturing rods, wires and tubes. Rods and tubes are produced by extruding. Welding is used as manufacturing method for tubes with seam.
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Production of towing hook
Frýdl, Pavel ; Štroner, Marek (referee) ; Lidmila, Zdeněk (advisor)
Requirements for the creation of a new technological process of manufacturing of towing hooks were cost savings by optimizing the initial blank and by creating semi automatic workplace. Selecting longitudinal rolling technology for manufacturing preform piece occurs to shorten production times and substantial material savings. By rolling of blank are secured always the exact dimensions of the preform piece and through a chain conveyors is facilitated handling with material for workers and reduced production time of forging line. By introduction of the proposed manufacturing method of towing hooks depending on the size of the series 30000 hooks per year will be achieved annually savings of over 4.000.000 CZK. Return of investments for the acquisition and adjustment of forging rolls and conveyors is 2,2 years.
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