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Simulation of CNC machine tool spindle in ADAMS software
Pham, Jakub ; Holub, Michal (referee) ; Tůma, Jiří (advisor)
The bachelor thesis deals with the design of a simulation model of a CNC machine tool in MSC ADAMS software. Nowadays, simulations have become an integral part of every development process, as they offer a cost-effective alternative to classical machine development involving prototyping. Within machine tools, dynamic simulation of machine nodes is one of the unexplored areas. The aim of this work is to verify their functionality and reliability in this area. Within the scope of the bachelor thesis, a research on dynamic system simulations, the finite element method and the simulation software MSC Adams and Ansys has been carried out. In the practical part, the spindle loading of the MCV 754 Quick machine tool was designed. Subsequently, the model geometry and boundary conditions were determined and the spindle was simulated during the cutting process in MSC ADAMS. The simulation results were verified by both analytical calculation and experimental measurements on the machine. Furthermore, the concept of further development of the model within the framework of cosimulation was presented. Finally, all output parameters were compared and evaluated.
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Design of a portable machine for machining large diameter pipes
Boháč, Josef ; Pavlík, Jan (referee) ; Tůma, Jiří (advisor)
This diploma thesis deals with the design of a portable machine for machining large diameter pipes. This thesis is divided into research, calculation, design, and construction parts. The introductory part is devoted to research in the field of joining large diameter pipes, with a focus on flanged and welded joints. Based on the findings from the research part, several construction solutions were considered. In the next part, the most suitable design solution was selected using a multicriteria analysis technique and subsequently elaborated on in detail. The following chapter deals with the calculation of maximal cutting forces and the selection of motor. An air motor was chosen as the most suitable option for the proposed machine. This part is followed by the computational part, which includes strength calculations for the critical parts of the machine. The final part of the thesis is devoted to the construction itself and the description of the individual construction nodes of the machine. The thesis also includes a 3D model, drawings of selected parts, and an assembly drawing.
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Design of cutting device for precise cutting of aluminum alloy tubes
Schaffelhofer, Igor ; Omes, Jiří (referee) ; Tůma, Jiří (advisor)
This master thesis is focused on the design of device for precise cutting of aluminum alloy pipes, which are part of gas-insulated switchgears at Hitachi Energy. Due to the implementation of new welding technology using friction stiring, there are increased requirements for the quality and accuracy of cuts, and the overall acceleration of the cutting process, including the associated handling. The current situation is the division of aluminum pipes using a band saw, which is insufficient not only in terms of output quality but also capacity. The proposed solution in this master thesis is in accordance with the necessary quality and capacity input requirements, which is required by friction stir welding technology (FSW). In the introductory research part, the work is focused on methods of material cutting. In the next part, the requirements for the cutting device are evaluated together with the evaluation and selection of a suitable method for the design. In the structural part of the master thesis, the individual concepts of partial parts are given, where the selected variants are supplemented by appropriate calculations.
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Digital twin of machine tool
Klíč, Daniel ; Štěpánek, Vojtěch (referee) ; Tůma, Jiří (advisor)
Digital twin is virtual model of real object or process, which its functions and operations can be simulated.This thesis focuses on the creation of a digital twin of axis movements on a three-axis CNC milling machine MCV Quick 754, which is located in the laboratories of the Institute of Production Machines, Systems and Robotics at Brno University of Technology. The creation of the digital twin was carried out in Autodesk Inventor, in which the models were processed, in Adams View, in which the kinematic chain and the forces acting on the mechanical part of the machine were created. The whole assembly was exported for use in Matlab Simulink. In Matlab Simulink the drives and their control were created and the required positions and speeds were specified. The runs of the measured quantities on the real machine were compared with the simulation and the resulting values were in relative agreement.
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Design of magnetic drilling machine
Jun, Lukáš ; Tůma, Zdeněk (referee) ; Tůma, Jiří (advisor)
The thesis is focused on a specific type of drilling machines, the magnetic drills press. These machines are typical for their magnetic base and are used mainly to machine magnetic materials, nonetheless, with suitable accessories, also the non-magnetic materials can be machined. The first part of the thesis begins with a description of the individual parts of the magnetic drill, their types and an overview of the accessories. The second part of the thesis contains the design of the drill itself. Cutting conditions for a 20mm twist drill and a 60mm annular cutter are defined. Based on the cutting conditions the motor is selected, then the design of a gearbox, selection of bearings and the whole assembly of the gearbox is described. Calculations of gearing, 3d model, drawing of assembly and two parts are attached with the thesis.
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Design of automatic clamping device for CNC milling machine
Jirásek, Jiří ; Holub, Michal (referee) ; Tůma, Jiří (advisor)
This work is focused on the design and construction of a device for automatic replacement of workpieces for CNC milling machines. The thesis contains research in the field of automatic replacement of workpieces. The design itself can be divided into two parts. The first part is the selection of a universal clamping platform and the design of a technological pallet. The second part is the design and construction of the clamping device. First, different design variants are proposed.. These variants are then evaluated by multi-criteria analysis, based on which the most suitable variant is chosen. This is followed by the selection of suitable components for the assembly of the universal clamping platform and the construction of the technological pallet. The main part of the work is the structural design of the pneumatic wedge vice, including the necessary calculations and design of individual components. The output is technical drawings of chosen components and a technical drawing and CAD model of the assembly.
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Design of belt grinder
Polnický, Jan ; Tůma, Jiří (referee) ; Pavlík, Jan (advisor)
This bachelor thesis deals with the design of a belt grinder. The first chapter deals with the analysis of grinding technology and research of available belt grinders on the market. In the next section, several variants are described and the most suitable one is selected. The design part describes some details important for the working of the machine. The last part is about checking critical parts by using calculations.
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Design of lathe for wood
Kuchař, Tomáš ; Tůma, Jiří (referee) ; Pavlík, Jan (advisor)
The bachelor thesis deals with the construction of a wood lathe. In the thesis market research is carried out, on the basis of which the parameters of the lathe are proposed. Furthermore, it contains a theoretical description of wood machining, selection of the most suitable design for each structural node based on multi-criteria weighted selection, followed by the necessary calculations for the design of the wood lathe and at the end of the thesis the whole design is described in detail. Drawings of selected structural nodes are included in this work.
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Spot welding workplace automation
Chlup, Adam ; Tůma, Jiří (referee) ; Knoflíček, Radek (advisor)
Bachelor thesis made in collaboration with Norma Czech s.r.o. company deals with designing and implementing automated spot welding workplace. The first part of the bachelor thesis is describing current information and knowledge about clamping of weldments and its manipulation. Using the knowledge of welding jigs, a design of not only welding jig, but also of the entire welding workplace with automation elements is then made. This design is then implemented in practice with main goals to save as much as possible space in the production hall, increasing productivity and effectivity of workplace. Thanks to the application of the UR 5 robotic arm in work cell is productivity measured by number of pieces per people hour (PPH) increased by 96 %.
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A design of small size power hammer
Hladík, Radim ; Knoflíček, Radek (referee) ; Tůma, Jiří (advisor)
The bachelor's thesis, in addition to the design of small power hammer, contains information from the history of power hammers, current research of the market of the manufacturers of these forming machines and their specific requirements. It also states the classification of these forming machines according to various criteria for example based on the structural arrangement, the method of energy transfer, etc. Furthermore, two designs of the power hammer construction are carried out according to the specified parameters. One of these variants is selected based on the multicriteria analysis and presents a detailed proposal. In this selected variant is made 3D model design sketched using software Autodesk Inventor 2021, basic design calculation and drawing documentation. In conclusion, there are recommendations for practice and evaluation of work results.
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