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The virtual prototype in design process of the machine tool
Krejčiřík, Petr ; Hadaš, Zdeněk (referee) ; Vetiška, Jan (advisor)
This bachelor thesis discusses about possibilities of using virtual prototype in design stage of the machine tool. The virtual prototype can be divided into a visual and an analytical model. Both parts of the prototype are possible to analyze with the required criteria and thus obtain an optimal result of proposed object. These analyses effectively reduce costs during the design stage of the machine tool. Using of the virtual prototype ensures that the first manufactured piece is correct according to the required criteria. Compared with an access using a physical prototype is achieved far greater time and financial savings because there are not created non-usable parts.
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STABILITY ANALYSIS OF CUTTING PROCESS OF MACHINE TOOL WITH RESPECT TO CHATTER
Vetiška, Jan ; Marek, Jiří (referee) ; Singule, Vladislav (referee) ; Březina, Tomáš (advisor)
The thesis deals with building and utilization of mechatronic models which are based on modeling of system of rigid and flexible bodies. Such models are then used for analysis of behavior of complex systems, for instance machine tools. The work is concentrated on analysis of self-excitation of a machine tool. The appearance of the self-excitation during the machining may be influenced by several methods described in the work. The evaluation of the appearance of the self-excitation is analyzed via so called lobe diagram. It is necessary to know transfer function describing the impact of acting forces on the deformation of the system (machine tool in this case) for compilation of the lobe diagram. The whole structure of the model shows compliant behavior which dramatically influences the transfer function thus the approach to the modeling of mechanical parts as flexible bodies is proposed. There are created models of modally reduced flexible bodies based on modified CAD models which have same modal properties as non-reduced FEM models up to the maximal excitation frequency. The reduced models have significantly lower number of degrees of freedom and it is possible to work with them in multi-body simulation tools and at the same time they contain the information about the deformations. The work utilizes Graig-Bamton method which is implemented to the ANSYS. The whole model is consequently built and analyzed in ADAMS. It is possible to export the linearized model of the system in form of state matrices which are used for writing of the transfer function. The conditions of stability of the machining process are then evaluated via the lobe diagram. The proposed thesis presents the modeling of mechatronic systems with stiff and rigid bodies. The approach may be used for analysis of machining tools as well as for development of advanced mechatronic systems with active damping, etc.
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SYSTEM APPROACH OF MACHINE TOOL DEVELOPMENT
Dosedla, Michal ; Demeč, Peter (referee) ; Skýpala, Milan (referee) ; Knoflíček, Radek (referee) ; Marek, Jiří (advisor)
The doctoral thesis deals with a position of a design process in machine tool life-cycle and with main design approaches. Main aim of the doctoral thesis is to bring System approach of machine tool development. This method follows design team experience with support by systematic methods and managing by product manager. Alongside this method respects System approach defined by Janicek. It is possible to achieve increasing of machine technical quality, reducing of final machine costs and reducing of time for machine tool creation by application of this method. System approach of machine tool development is focused on detailed outer and inner optimization of a machine structure from technical and economical point of view. This design approach is possible to apply in any production company because it is brought in intelligible way.
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Development And Verification Of A New Method For Measuring The Stiffness And Damping Properties Of Joints In Parallel Kinematic Structures
Kolouch, Martin ; Tomáš, Jiří (referee) ; Knoflíček, Radek (advisor)
In this dissertation is presented the development of a new measurement method for the stiffness and damping characteristics of a joint in a parallel kinematic machine tool. The main contribution of this method is specially for applications, that demand accurate information about stiffness and damping parameters from assembled parts of machines tool. Methods for compensation of deformations in machines tool, that are carried out by control, belong to these applications. Another contribution of this work is the technical implementation of the proposed principle of the new method. At this point the focus of the work was devoted to signal processing, that differs in a certain degree from other types of signal processing methods, that are used in other dynamic measurements, e.g. modal analysis. One of the main requirements was the possibility to consider the nonlinear behavior of the measured structure. In another chapter the modified signal processing method was used for measuring a joint in a test rig. The results were compared with results from other measurement methods. On account of this comparison the statement was made that the new method can be used for measuring the stiffness and damping parameters of machine parts. Finally the new method was applied to measure the properties of a joint, which was built in a machine tool. Moreover, the problems, that appeared during the measurement, were also described.
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Control of special purpose machine tool
Plocek, Jaroslav ; Holub, Michal (referee) ; Houška, Pavel (advisor)
The master thesis treats the design of control system of special purpose machine tool. The first part analyzes and compares two possible variants of control system which use either a CNC control system Sinumerik or motion control system Simotion. Only the variant with the Simotion control system is subsequently examined in detail: its hardware configuration, the selection of components and partly also the software solution. The thesis further deals with the safety of the realized control system and of the whole machine. There are described general safety requirements of machinery based on harmonized European standards and their specific application in the design of safety functions and the safety circuits of solved machine tool.
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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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The storage stacker for machine tools
Hradil, Martin ; Bukovský, Radim (referee) ; Kašpárek, Jaroslav (advisor)
In these days, on over the world, we ca find a huge CNC centres which are more and more often completely automatized. There is no necessity of human intervention to change or stock the machining tools. All these operations are made thanks of robots and manipulators to economize time and money. Target of this these is conception of the mobile storage stacker which can be made and then transported to the place of usage in a 40ft sea container. After transportation the stacker is completelly reade to use. Thanks of this concept, we gain universal storage stacker for differents conditions without necessity of new concepts and and solutions for each CNC centre.
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Virtual model of part of cutting machine in ADAMS
Juriga, Jakub ; Vetiška, Jan (referee) ; Hadaš, Zdeněk (advisor)
In theoretical part, this master´s thesis deals with vibrations in cutting machine and description of creation of self-excited vibrations theory. In practical part, there is problem of chatter in cutting machine solved with using simulation program Adams and computing program MATLAB. Gradually, Multi body system of cutting machine and model of cutting tool with features flexible body are analyzed. At the end all both models were used to create complex model of the cutting machine .
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Computational analysis of the steel-composite carrier of the machining center TM 2000
Zbožínek, Martin ; Obdržálek, Vít (referee) ; Vrbka, Jan (advisor)
The main objective of the work was to perform a computational analysis of the hybrid (steel-composite) carrier and compare the results with the original metal carrier. Static analysis, modal analysis and frequency response were solved. Computation was performed for three different relative positions of the carrier. Static stiffness, natural frequencies and dynamic compliance have been calculated. The results were verified by an experiment performed on a scaled-down model of the carrier. Modern software products, namely MSC Patran, MD Nastran, Matlab and ProENGINEER, were used for the calculation.
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Advanced technology project of valve body
Štábl, Martin ; Zemčík, Oskar (referee) ; Zemčík, Oskar (advisor)
This diploma work is dealing with the progressive production technology proposal of the valve body type S43 components. This is the high-pressure valve for the classical power supply. Here in the work is described the structural design of the valves, the material of the valve body and its machinability. Following an analysis of the existing production technology is the new production technology proposal for this part. All is designed with regards to the business possibilities of the Armaturka Vranová Lhota company. In conclusion of the work is presented the technical economic evaluation of both the existing and the proposed manufacturing technology.
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