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Design of milling machine spindl
Betlach, Jakub ; Hrbáček, Jakub (referee) ; Blecha, Petr (advisor)
The aim of this bachelor’s thesis is the construction of the milling machine spindle. The first part includes research in the structural part of machine-tools spindles that are used currently. The first section also contains an overview of producers of machine-tools and their milling machines. The second part is focused on the design of the spindle according to selected parameters, including the necessary calculations. This thesis also includes spindle assembly drawing and 3D model created with Autodesk Inventor Professional 2011.
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The influence of process fluid on the machining cycle
Ertl, Roman ; Fiala, Zdeněk (referee) ; Kalivoda, Milan (advisor)
The bachelor’s thesis focuses on literature search of problems of process fluids in the machining cycle. The aim of the thesis is to describe the properties of metalworking fluids and their distribution. Subsequently, the requirements for metalworking fluids from different angles of view are described. Process infuences are also discussed in detail on aspects such as temperature, wear, tool durability, etc. Another aim of the thesis is the feeding of process fluid into the machine’s working space and alternatives to process fluids, where MQL and dry machining are included. Great emphasis is placed on protecting the environment and the influence of liquids on the health of the machine operator. Subsequently, the basic maintenance of metalworking fluid sis described, starting with the creation of a new concentrate until their disposal.
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Modern slide bearings
Lesák, Tomáš ; Raffai, Peter (referee) ; Maršálek, Ondřej (advisor)
This bachelor thesis is professional research dealing with an overview of slide bearings in current use and their advantages and disadvantages compared with ball and roller bearings. It also describes the design, manufacturing technology, materials used for the manufacture of plain bearings, their coatings types and lubrication which are important factors in the life of the bearings.
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Lubrication of knee joint replacement
Sadecká, Kateřina ; Horák, Zdeněk (referee) ; Vrbka, Martin (advisor)
The work deals with the lubrication of total knee replacement using fluorescence microscopy method, which allows unique insight into the contact between femoral and tibial component. The aim was to determine the effect of composition of synovial fluid (i.e. albumin, -globulin, hyaluronic acid and phospholipids) on film thickness and protein behaviour in contact, and also to determine changes of contact area during rotation. Since this is the first experimental work dealing with a knee replacement lubrication primarily, only simple rotation and load cycles were applied by the knee simulator. The output of the experiments was fluorescence intensity, which corresponds to dimensionless film thickness, over time. Another important output are the images directly showing the fluorescently labelled proteins in the contact area. The results show, there are fundamental differences in lubrication in different positions of rotation, due to changes of position, shape and behaviour of the contact area. The composition of the lubricant is also essential, since the proteins themselves form a relatively strong lubricating film and their mixture leads to a substantial reduction of film thickness, due to significant formation of clusters. Complex fluid, although it does not form the strongest layer, is able to create a quite continuous film.
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Slide bearing parameters of modern combustion engines
Dvořák, Martin ; Píštěk, Václav (referee) ; Novotný, Pavel (advisor)
The objective of this bachelor‘s thesis is to provide general information on sliding bearings and their advantages and disadvantages. The thesis is divided into five parts that deal with individual topics and issues. The first one is concerned with the bearings themselves, their partition and development. The second part compares sliding bearings and rolling contact bearings and their pros and cons. The next part then describes their main parameters, e.g. the friction loss or various lubrication methods. The fourth one summarizes several examples of practice, like lubricating in extreme working conditions and an overview of bearing failures. The last part deals with the construction of sliding bearings used in combustion engines, materials used to produce sliding bearings and with the issue of lubrication, which is essential for this type of bearings.
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Effect of lubricant rheology on lubrication film thickness.
Prášilová, Alena ; Šperka, Petr (referee) ; Křupka, Ivan (advisor)
Lubrication is a very important part of mechanical engineering, which ensures high lifetime of machine parts, reduction of friction and wear and also it leads to decreasing of power consumption. In this bachelor`s thesis there is described rheology of newtonian and non-newtonian lubricants and its effect on lubrication film thickness. Measured central film thickness values are compared with theoretical prediction.
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Experimental observation of grease migration in a rolling bearing simulator
Palán, Miroslav ; Okál, Michal (referee) ; Košťál, David (advisor)
This thesis is using fluorescence microscopy to separately observe components of grease lubricate in simulator of ball rolling bearing. Simulator is in the configuration ball-on-disk when the disk was replaced by the outside ring made by tempered glass. This ring allows light passing to normally unseeable places of steel bearing. By the separate study of greases particles, coloured with special fluorescent dye, was found that method of fluorescence microscopy can be used to gain information about grease lubricated process in bearing.
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Off-board systems for top-of-rail lubrication
Málek, Jan ; Kvarda, Daniel (referee) ; Galas, Radovan (advisor)
This bachelor’s thesis is focused on rail off-board lubrication system. The main part of this thesis is explaining of function and design few certain lubrication systems. In this thesis are explained aspects of wheel-rail contact, such as types and parts of rail, adhesion, slip, creep–traction diagram. Another part of this thesis is description of few certain lubrication system for top of rail and gauge face application. In this thesis are explained product of major companies of friction management industries such as SKF-Lincoln, Whitmore, Loram. Additional part of this thesis speaks about usage and development of this devices in Czech Republic. Output of this thesis is conclusion about advantages and disadvantages these certain devices.
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Production of support by forming
Palán, Robert ; Novotný, Karel (referee) ; Kopřiva, Miloslav (advisor)
PALÁN Robert, Production of support forming.A graduation thesis of master´s studies, Mechanical engineering, Department M2307 Metal forging technology, Specialization 02 Forming, Welding, 2. graduate, 2. year, school – year 2007/2008. FSI VUT Brno, ÚST Department of Metal Forging Technology, May 2008, page NO 66, picture NO 36, chart NO 8, suplement NO 12 The graduation thesis, drew up with in the frame of engeneering studies department M2307, submits a concept of a production by forming. A materiál of a forget piece is steel ČSN 12 050, provided as a semi – finished product in a form of a bar 210 mm, lenght 4 000 mm. The particular dimension stocks with be cut from it to forge out a part. Production work is 100 000 pcs. Based on studies of technologies, suitable for producing the part a specific two stage technology of a drop forging was chozen on a vertical forging press LMZ 6 500, with induction heating of the semi – finished product and a product – trim of fin and pellicle or a trimming press LDO 315 A/S. For this alternate all the required calculations are realized of swages and all the necessary machines for the production of are quested enganget part.
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