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Crank mechanism with a high mechanical efficiency
Drápal, Lubomír ; Tůma, Jiří (referee) ; Páv,, Karel (referee) ; Píštěk, Václav (advisor)
This document describes the possibilities of increasing the mechanical efficiency of the crank train of an internal-combustion engine. For this purpose, a concept with a reduced number of main bearings is chosen and its contribution is verified experimentally. The proposed solution consists of an innovative crankshaft design of a four-cylinder spark-ignition engine with only three main journal bearings and laser-welded sheet metal crank webs. The new design is compared to the mass-produced one in terms of friction losses, vibrations and loading of engine parts by means of simulations of crank train dynamics using the Multi-Body System. The increase in vibration, accompanied by a reduction in friction losses, is compensated by a torsional vibration damper and its effect is experimentally verified. Experimental research of laser welds on the crankshaft in terms of fatigue life is also described. The overall potential is also summarised and further possible development of this innovative and patented design is outlined.
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Design of a rotary table for a machine tool
Axmann, Patrik ; Tůma, Jiří (referee) ; Blecha, Petr (advisor)
This bachelor thesis deals with the construction of a rotary table for a machine tool. The first part deals with the system analysis of the problems, namely the use of drives, gear mechanisms, bearings and measuring systems in the design. Subsequently, manufacturers and the creation of variants of design solutions. The second part of the thesis is focused on calculations and design of the chosen design variant.
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The issue of Ecodesign in the machine tool
Burtsev, Ilya ; Tůma, Jiří (referee) ; Holub, Michal (advisor)
This bachaelors thesis discusses the issues of Ecodesign in the machine tools. The first part of the thesis includes analysis of current legislation requirements in Ecodesign. The second part of the thesis includes researches in Ecodesign and energy efficent components. In conclusion of the thesis described personal recommendation in sphere of Ecodesign.
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Design of threading head with automatic reversing
Žebrák, Matěj ; Pavlík, Jan (referee) ; Tůma, Jiří (advisor)
This bachelor’s thesis deals with the design of reversing tapping head. The thesis is divided into two parts. First part is devoted to an overview of technologies for the thread producing focusing to tapping and research in field of tapping heads. Second part contains design of reversing tapping head including the necessary calculations.
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Design of a cross table for a machine tool
Bouchal, Tomáš ; Tůma, Jiří (referee) ; Blecha, Petr (advisor)
This choice topic: Design of milling machine cross table belongs at branch machine tool. Cross table is mechanical table, which moved in two axis. Cross table is used exclusively of milling machines. Next use of drilling machines, CNC machines, grinding machines. Bachelor works is divided into a search part in which contains summary cross table on the market. Practical part bachelor works in which contains computational part and designer part. Computational part cross table our help to acquire basic pamaterers for designer parts. Designers part cross table designers to help 3D modelling program Solidworks.
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Design of rolling mill for flexible single chamber tubes
Maštera, Lukáš ; Tůma, Jiří (referee) ; Blecha, Radim (advisor)
The Project is a masterpiece of Bachelor degree undergraduate of the Mechanical Engeneering at University of Technology in Brno and in general points out the basic problems associated with constructional plan of the forming machine for flexible pipe production. The Project contains the preview of production of the pipes and problems with designing the machine mainly the forming wheels draft
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Development of pressure switch for rail vehicles
Havelka, Ondřej ; Tůma, Jiří (referee) ; Tůma, Zdeněk (advisor)
This diploma thesis deals with the design of pneumatic pressure switch with adjustable hysteresis. In the thesis is carried out the introduction in the theory of compressed air and research of the pressure switches at the market. Based on the gathered information and customer specification, the design draft of the pressure switch has been created. In the thesis are described three main parts of the prototype: transform of the pressure, adjustable hysteresis and synchronization of the microswitches. In the end of the thesis is described the testing of prototype and summary of the results.
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Machine tools for large-scale production
Nejedlý, Tomáš ; Zahálka, Jiří (referee) ; Tůma, Jiří (advisor)
The bachelor thesis focuses on the issue of processing machine in large-lot production. First part of this paper includes an overview in the field of constructional single purpose machines. Typified nodes of individual producers are described in this part. Then this part describes machines of companies which deal with the issue mentioned above. In the second part of the bachelor thesis is elaborated a project of proper production machine. The project is elaborated on the basis of facts consequent on the overview in the first part of this paper.
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Design of lathe spindle
Novák, Tomáš ; Tůma, Jiří (referee) ; Blecha, Petr (advisor)
The subject of this bachelor's thesis is a literary overview and a simple design of a lathe spindle with basic calculations. The first part contains a overview and a categorization of lathes with their technical parameters and the literary research, which is focused on the spindle of machine tools. The second part contains calculations and the design of the lathe spindle. The 3D model of the spindle, designed in SolidWorks 2008 software, and the assembly drawing of the lathe spindle are also included in this thesis.
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Design of CNC lathe broaching head
Boháč, Josef ; Knoflíček, Radek (referee) ; Tůma, Jiří (advisor)
This bachelor’s thesis deals with the design of construction of broaching head for CNC lathe. This thesis is divided into research part, computational and construction part. The research part is dealing with the CNC lathes and tools with focus on the BMT and VDI tool turrets. Based on the outputs from the research, design parameters and suitable construction solution was chosen. The chosen construction solution uses the crank mechanism. This part is followed by the computational part which includes strength calculations of construction parts and other parameters such as cutting force. The last part is dealing with the construction of the broaching head itself. This thesis also includes a 3D model, drawings of selected parts and an assembly drawing.
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