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Hazard analysis of toolroom workshop
Dubovský, Dávid ; Bradáč, František (referee) ; Blecha, Petr (advisor)
This master`s thesis deals with a hazard analysis of selected machinery according to an actual legislative documents in Slovakia, which were taken over from Europien Union directives. The thesis is focused on exploring legislation related to the safety of toolroom workshop in the Czech Republic and Germany. Because of that was done the recherché of harmonized standards in these countries. Subsequently is made the identification of hazards under recherched standards and assessment of control system based on the performance level of the system. In the end are all obtained data evaluated and the precautionary measures are suggested. With taking care of economic factors are finally proposed the possibilities of the elimination of risks.
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Numerical control of machine tools
Dlouhý, Rostislav ; Opl, Miroslav (referee) ; Blecha, Petr (advisor)
This thesis is focused on numerical control of machine tools. Control systems are shortly compared. There are three biggest manufacturers: Siemens, Fanuc and Heidenhain. Especially user benefits and opportunities of workshop programming are compared. The second part is focused on the choice of control system for the selected machine tool. I am applying the knowledge and the conclusions which I have reached in comparing different control systems. I chose two alternatives of the control system based from entered requests for the chosen machine tool.
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Risk analysis of operated lathe machine
Budinová, Nela ; Rozehnalová, Jana (referee) ; Blecha, Petr (advisor)
This bachelor thesis presents legislative requirements and standards of the European Parliament and Council valid to the machine marketed and to the machine operated. The thesis compares two standards in terms of safety requirements that were required in the year of machine production and what is now required. Furthermore there is a risk analysis for lathe machine type SV 18 RD
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Semi Automatic Lathe Machines
Chytil, Jakub ; Blecha, Radim (referee) ; Blecha, Petr (advisor)
This thesis deals with the background research, description and division of semi-automatic lathe machines. One of the thesis’s tasks is to realize the computational concept of a particular machine component. The beginning of the thesis focuses on the principle of lathe turning, the basic calculations, brief description of lathe blades, the main parts of semi-automatic lathe machines, and kinds of semi-automatic lathe machines. There are described machines of contemporary production with their main parameters and manufacturers in The Czech Republic and in foreign countries further on. The final part of the thesis is addressed to calculation of spindle deformation and optimal distance between the Bearings.
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Free Vibration Analysis of Machine Tool Parts by High Feed Rates
Zábojník, Petr ; Drossel, Welf-Guntram (referee) ; Blecha, Petr (advisor)
Rostoucích nároků na produktivitu obráběcích strojů je dosaženo zvyšováním dynamiky těchto strojů. S vysokou dynamikou se na stroji může budit volné kmitání jednotlivých součástí, které ovlivňuje přesnost pohybu posuvové osy stroje, stejně jako přesnost pohybu nástroje. V diplomové práci jsou zkoumány jednotlivé parametry stroje a řídícího systému a jejich vliv na nabuzené frekvence. Aby mohly být jednotlivé vlivy zkoumány, je v diplomové práci vytvořen zjednodušený model posuvové osy pro analýzu metodou konečných prvků v programu Ansys. Tento model je následně spojen s řídícím systémem v programu Matlab/Simulink, díky čemuž je umožněno teoretické zkoumání mechanických a regulačních vlivů na přesnost dráhy posuvové osy a kmitání jednotlivých částí stroje. Výsledkem diplomové práce je funkční propojení FE modelu a řídícího systému, který může být použit pro mnoho různých výzkumů, a na kterém byly zkoumány vlivy vybraných parametrů stroje a řídícího systému.
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Lathe machines with vertical rotary axis
Mrázek, Petr ; Blecha, Radim (referee) ; Blecha, Petr (advisor)
The bachelor’s thesis deals with description and classification of vertical lathe machines. All content is organized into several chapters. The introduction is concerned with history and basis of the turning. Next part describes basic types of vertical lathe machines and important manufacturers. In the end of bachelor´s thesis is simple calculation of the gear pump.
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Description of automatic tool change systems in machining centers
Glogar, Matěj ; Blecha, Radim (referee) ; Blecha, Petr (advisor)
Automation of tools changing belongs to key issues how to increase universality, flexibility and total level of automation of processing production machines. We don’t usually manage with one active term (tool) in the cause of the mechanical machining only but we derive benefits from many different tools in the appropriate operation circle. Therefore the first matter of raising productivity of machine-tools was a necessity to change automatic tools. The main contribution of automatic tools changing that are used by numerical control machines is a possibility of automatic control of whole machining on the one specific machine. An automatic tool changing contributes to reduction of operation time and to reduction of the amount of operation’s intervention during the industrial process. This is related to elimination products inaccuracy, that is caused by human factor (e.g. bad tool’s position) and increase of safety at work. The aim of this bachelor’s thesis is to make a literature research and to characterize automatic tools changings, which are used by machine-tools with a horizontal spindle.
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Welding machine
Janota, Josef ; Musil, Martin (referee) ; Blecha, Petr (advisor)
The thesis deals with the theoretical researches in the field of welding machines. The practical part deals with the overall design and construction of rotary welding machine for the production flow. The welding equipment used by MAG.
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CNC Machine tools safety
Houška, Jan ; Blecha, Radim (referee) ; Blecha, Petr (advisor)
The bachelor thesis sort out safety requirements relating to CNC machining centres under relevant European Union harmonisation legislation, Czech Republic legislation and under harmonised standards. After giving a summary of requirements, the thesis contains check lists for specific CNC machining center.
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