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Topic |
The study aerosol creation during the machining process using a liquid.
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Supervisor |
Associate Professor Ing. Peter Šugár, CSc. |
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Annotation |
The main goal of the dissertation is the experimental investigation of variable operating conditions and effects of cutting / fluids mist generation mechanism (atomization, vaporization) during machining. The experimental results will be used for mathematical modelling and optimization of air quality in the machine tool workspace. |
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Topic |
Modern assessment of similarities between objects and processes of engineering productions.
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Supervisor |
Associate professor Ing. Peter Šugár, CSc. |
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Annotation |
The thesis is focused on the research of similarity between selected objects of the manufacturing processes. The quantification of specific similarity relations occurred between work pieces, tools, fixtures, machine tools and process plans will be studied by use of the fuzzy set theory. The algorithms of various computer aided process planning systems will be modified on the basis of the original evaluation methodology. |
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Topic |
Study of stress-strain states of surface layers of material after machining by tools with a geometrically defined edge
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Supervisor |
Associate Professor Ing. Peter Šugár, CSc. |
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Annotation |
The main goal of the thesis is theoretical and experimental research focused on the study of machined surfaces). The processes of machining by tools with geometrically defined edges d and the relations between selected machining parameters and the final complex quality of machined surfaces will be determined. |
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Topic |
Flexure of long work pieces when they are turning
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Supervisor |
Associate Professor Ing. Augustín Görög, PhD. |
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Annotation |
The objective is to mathematical determine the flexure of long work pieces when they are turning, experimental verification of mathematically determined values of flexure and the suggestion of removing the effects of this flexure relating to the accuracy of the turned parts. |
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Topic |
Influence of fixative forces on the accuracy of the turned work pieces
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Supervisor |
Associate Professor Ing. Augustín Görög, PhD. |
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Annotation |
The objective is theoretical analysis of the influence of fixative forces on the accuracy of the turned work pieces and experimental confirmation of the results for analysis. |
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Topic |
Machining of composite materials
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Supervisor |
Associate Professor Ing. Augustín Görög, PhD. |
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Annotation |
The objective is analysis of alternative machining composite materials and the application of the results of this analysis relating to the machining of specific composite materials used within the aircraft industry. |
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Topic |
Mathematical methods and implantation in finishing methods of machining
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Supervisor |
Prof.Ing.Zdenko Lipa,CSc. |
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Annotation |
The finishing methods of machining are not still processed sufficiently. The application of higher mathematics is missing in problematic finishing methods of machining. Some problems of the theory of super finishing are elaborated for the present (differential equation of stock removal, analysis of motions), but the solution of problems relating to surface quality and removal and force proportions is missing at another finishing methods of machining. |
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Topic |
Implantation of transformational and theological methods into the chosen problematic of analytical cutting theory |
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Supervisor |
prof.Ing.Zdenko Lipa,CSc. |
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Annotation |
Analytical cutting theory still worked mainly with lower instruments of mathematics and don't uses the potentialities of various methods of mathematics and physics. Some problems of cutting is possible to solve also with utilizing processes and methods, which was used in another branches of science. Thus the transformation of these solutions is possible into the theory of cutting. Moreover, the theological models could find applications at solution of problematic of cutting theory. |
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Topic |
Contribution to chosen problems of theory of super finishing
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Supervisor |
prof.Ing.Zdenko Lipa,CSc. |
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Annotation |
Theoretical solutions of super finishing problems in many cases are still not sufficiently prepared. It relates mainly the important phenomenon in finishing machining (therefore also in super finishing), which is the surface roughness and integrity of super finished surface. The complicated super finishing kinematics is also not sufficiently theoretically explored (mainly concerning the consequences of its application). Also another occurrence provides particular theoretical gaps. |
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Topic |
Metallurgical bonding of Mg alloys with other metals
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Supervisor |
prof. Ing. Milan Turňa, PhD. IWE. |
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Annotation |
Welding of very perspective Mg alloys with other metals is concerned. Their application is anticipated mainly in transport technologies including aviation. It must be taken into account that Mg and its alloys exert a high affinity to oxygen. They are melted in vacuum and, during welding, the welding zone must be protected. The fusion metallurgical bonding (welding, brazing) must be performed either in a vacuum and/or in an inert atmosphere. Some solid state welding technologies seem to be perspective (explosion welding, diffusion bonding, friction welding). It is necessary to study the weld ability of Mg alloys with Al and its alloys and also with Ti and its alloys etc. Quality of welded joints will be assessed by defectoscopy, by mechanical testing, optical microscopy, X-ray microanalysis and electron microscopy. The structural stability will be additionally assessed also by the application of available software. |
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Topic |
The effect of induction heating on the formation process of metallurgical bonds
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Supervisor |
Prof. Ing. Milan Turňa, PhD. IWE. |
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Annotation |
Induction heating is still very topical for metallurgical bonding of metals. It is suitable for both, welding and brazing/soldering. High-frequency heating with a "skin effect" is suitable especially for surfacing. The technological processes based on induction heating may in some cases significantly compete also with special technologies of welding, surfacing (brazing) with concentrated power sources (including plasma and laser). The equipment for induction heating is available in a common laboratory of the Institute of Production Technologies and the Institute of Materials at Faculty of Materials Science and Technology in Trnava. The entire process of heating and cooling down can be simulated. The quality of welded joints will be assessed by defectoscopy, by mechanical testing, optical microscopy, X-ray microanalysis and electron microscopy. The structural stability will be additionally assessed also via the application of available software. |
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Topic |
Prediction of weld joint defects by monitoring welding parameters.
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Supervisor |
Associate Professor Ing. Milan Marônek, PhD. |
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Annotation |
Welding parameters are important process variables, the weld joint quality is dependant on this., The change of welding parameters during the arc welding process can lead to formation of weld defects and thus the weld quality during its inspection can be classified as defective. The object of the thesis is to evaluate the possibilities of weld joint defect prediction based on measurements carried out by Weld Monitor hardware, equipment and software package. |
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Topic |
Welding of stainless steels by concentrated power sources for application in the food industry and health care
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Supervisor |
Associate Professor Ing. Milan Marônek, PhD. |
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Special Supervisor |
Ing. František Kolenič, PhD., Prvá zváračská, a. s. |
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Annotation |
Specific needs of the food industry and health care require special approach to the base metal selection as well as the methods of their joining. Apart from mechanical properties of the weld joints there is also the weld bead surface appearance and weld joint corrosion resistance that is of importance. The thesis objectives will cover a selection of appropriate types of weld joints, proposal of suitable welding technologies together with an estimation of welding parameters as well as mechanical properties and corrosion resistance of weld joints. |
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Topic |
Corrosion resistance of weld joints of sheets treated by nitro oxidation |
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Supervisor |
Associate Professor Ing. Milan Marônek, PhD. |
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Annotation |
Steel sheets treated by nitro oxidation are one of the possible alternatives of chemical-heat treatment. This treatment brings significant improvement of mechanical properties and corrosion resistance. On the other hand, the nitro oxidation layer is disrupted during the welding process which has negative consequences on corrosion resistance. The object of the thesis is to evaluate the corrosion resistance of weld joints made of sheets treated by nitro oxidation as dependence on welding process and its parameters. |
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Topic |
Verification of Process Parameters of Bulk Forming
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Supervisor |
Associate Professor Ing. Anton Ulík, CSc. |
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Annotation |
Monitoring and refining of process calculations for bulk forming. Laboratory measurements of forming parameters in general multipurpose as a testing tool for various materials. Comparison of obtained results with computer simulation results for these processes. Determination of magnitude of influence for individual parameters on strain. Utilization of computer simulation of forming processes from assignment of forming thru determination of strain process until verification of process parameters for production. |
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Topic |
Methodology of design and selection concerning sensorial equipment in the intelligent assembly cell.
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Supervisor |
Prof. Ing Karol Velíšek, CSc. |
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Annotation |
The dissertation thesis will involve sensorial equipment design for particular devices that are elements of the intelligent assembly cell (IAC). They will be elaborated methodological process of sensorial equipment design of IAC that makes it possible for increasing the flexible manufacturing cell of IAC by directing and the control system of this cell. Results of this design will be applied into the flexible manufacturing cell in the Institute of Manufacturing Systems and Applied Mechanics. Next the verification of achieved results in intelligent manufacturing cells and after the design of the next possibilities in the development in the mentioned area whilst under institute conditions. |
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Topic |
Methodology of design and selection of sensorial equipment in the intelligent manufacturing cell
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Supervisor |
prof. Ing Karol Velíšek, CSc. |
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Annotation |
In the dissertation thesis the sensorial equipment design for particular devices that are elements of intelligent manufacturing cell (IMC) will be resolved. The elaboration of methodological process of sensorial equipment design of IMC will follow, this includes increasing the f flexible manufacturing cell to IMC by directing and control system of this cell. Results of this design will be applied into flexible manufacturing cells in the Institute of Manufacturing Systems and Applied Mechanics. Follows will be realised verification of achieved results in intelligent manufacturing cell and designed next possibilities of development in mentioned area in institute conditions. |
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Topic |
Design of self - organising system of material flow in flexible manufacturing cell (FMC)
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Supervisor |
Associate Professor Ing. Peter Košťál, PhD. |
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Annotation |
In dissertation thesis will be realised analysis of up-to-date kinds of self - organising systems with primary interesting to systems of material manipulation that are used in flexible manufacturing systems. General methodology of these systems operation, an algorithm too, and computer aid for specific case of flexible manufacturing cell will be developed on the basis of this analysis. The optimum function of algorithm will be verified basically on several exemplary tasks that will be realised on the existing FMC. At the end of the dissertation work will be summarized possible additions of practical usage of these systems for the purpose of more effective function of FMC. |
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Topic |
Intelligent fixture systems
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Supervisor |
Associate Professor Ing. Peter Košťál, PhD. |
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Annotation |
In dissertation thesis will be reviewed actual situation in the area of intelligent and adaptive fixture systems and also will be realised requirements analysis for these fixture systems. On the basis of this requirements analysis be developed general design of sensorial and motorial accessories of mentioned fixture systems. In the second period, this design will be concretized for the specific requirements of positive flexible manufacturing cell. Pursuant to this concrete design will be realised intelligent fixture system for FMC on Institute of Manufacturing System and Applied Mechanics. |
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Topic |
Computer simulation as the scientific method for investigation of technological processes
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Supervisor |
Associate Professor Ing. Bohumil Taraba, CSc. |
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Annotation |
Computer simulation in the technological processes, current state, applications, trends in the information experiments. Design and realisation of experiment in the field of technological processes concerning production systems and devices, development of suitable simulation models and methodology of their solution. Combination of the CAx systems and finite element method software packages ANSYS, MSC (Marc, Adams, Nastran, ...) is preferred. |
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Topic |
Study of the mechanisms of joint formation in explosive welding using computer simulation
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Supervisor |
Associate Professor Ing. Bohumil Taraba, CSc. |
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Annotation |
The corrugated weld boundary is developed due to the several parameters of the process of explosive welding. The aims of the PhD thesis will be the definition of particular process parameters, elaboration of theoretical background of investigated problem and the development of simulation model(s) taking into account the obtained experimental data. The simulation model will contain the kinematics of the process of explosion welding, application of strain-rate dependent material models and fluid-structure interaction models (FSI) for the study of the air behaviour in the impact zone of welded materials. The applicable software products are ANSYS, MSC (Marc, Adams, Nastran, ...). |
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Topic |
Experimental and numerical approach to the investigation of laser cutting processes |
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Supervisor |
Associate Professor Ing. Bohumil Taraba, CSc. |
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Annotation |
PhD. thesis is oriented on the investigation of the metal laser cutting phenomena. The elaboration of theoretical knowledge for the laser cutting processes will create the scientific basis of PhD. thesis. Preparation of experiments in order to investigate the temperature fields, stress-strain states, material parameters and structures necessary for the development of simulation models will represent the main part of the thesis. Experiments are supposed to be performed in cooperation with TU Wien. Numerical analyses realized at the MTF STU will be used for analysis of chosen laser cutting processes and formulation of engineering and scientific conclusions. |
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Topic |
Modelling of metal forming from thixotropic state
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Supervisor |
Associate Professor Ing. Bohumil Taraba, CSc. |
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Special supervisor |
RNDr. Mária Behúlová, CSc., Prof. Dr. Ing. Bohuslav Mašek |
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Annotation |
Thesis will create a part of the research focused on the development of new forming technologies of materials in semi-solid state aimed at the manufacturing of complex shaped products with very accurate dimensions, homogeneous and fine microstructures and specific material properties. In the framework of thesis, the problems of modelling and numerical simulation of material heating to the thixotropic state, single- and multiphase material flow and cooling from semi-solid state without and with the application of deformation loading will be solved. The work will be realised in cooperation with the Research Centre of Forming Technology FORTECH at the University of West Bohemia in Pilsen.
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Topic |
Influence of technological parameters of laser beam welding on the microstructure, properties and lifetime of welds |
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Supervisor |
Associate Professor Ing. Bohumil Taraba, CSc. |
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Special supervisor |
RNDr. Mária Behúlová, CSc., Ing. Martin Kusý, PhD.
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Annotation |
Thesis will be focused on the study and analysis of the influence of technological parameters of laser beam welding on the quality of welds with the direction on the joining of unconventional materials. The main aim of the thesis will be development of the methodology for optimisation of laser welding parameters applying metallographic analyses, experimental measurements of chosen mechanical and utility properties of welds and numerical simulation of laser welding processes. The work will be solved in cooperation with the Institute for Production Engineering and Laser Technology of Vienna University of Technology. |
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Topic |
Numerical simulation and prediction of material behaviour in the processes of surface heat treatment
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Supervisor |
Associate Professor Ing. Bohumil Taraba, CSc. |
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Special supervisor |
RNDr. Mária Behúlová, CSc.
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Annotation |
Thesis will be focused on the study and numerical simulation of the development of high-strength surface layers in the progressive technologies of heat treatment of steels with the specific orientation on surface induction quenching and laser heat treatment. The object of the thesis will be development, verification and application of simulation models for the solution of coupled electro-magnetic, thermal, fluid and stress-strain fields in order to analyse the material behaviour during surface heat treatment and to optimize chosen technological processes.
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