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Design of the "twist off" lid tightening machine
Jirásek, Vojtěch ; Tůma, Jiří (referee) ; Hermanský, Dominik (advisor)
In the thesis is dealt with the structural design of a machine (and its structural components) for closing jars with twist-off lids. Common design solutions used in practice and their characteristics are mentioned. The selection of structural elements suitable for semi-automatic production was made out of these. The tightening torque of the chosen lids was determined to choose the tightening drive. The required clamping force was calculated to ensure the transfer of the tightening torque without undesirable slippage of the jar or lid, then a suitable linear pneumatic drive was chosen. The required time to complete each operation during sealing was calculated to check the production capacity.
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A design of thermoforming device
Vozár, Vojtěch ; Pavlík, Jan (referee) ; Tůma, Jiří (advisor)
This bachelor's thesis deals with the design proposal of a machine for thermoforming using and vacuum. The research part of this thesis discusses the technology of thermoforming plastics, production process, and tools used in thermoforming. Research part also includes a description of the machines available on the market. Following chapters describe the requirements for the machine, selection of design variants based on the weighted values method, and detailed design of the machine. Final part of thesis provides an estimate of the machine's cost and an evaluation of the results of the work. Bachelor thesis includes a 3D model created in SOLIDWORKS 2023 and chosen technical drawings.
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Design of a double column hydraulic jack
Hladík, Radim ; Tůma, Jiří (referee) ; Pavlík, Jan (advisor)
The master's thesis includes the design of a double-column lift as well as an introduction to electric vehicle servicing. Additionally, market research is conducted based on defined problem requirements. Four design variants are proposed, and the most suitable one is selected using multicriteria analysis. Risk analysis and dimensioning calculations are prepared according to relevant directives and standards. The selected variant is then processed into a 3D model using Solidworks 2018 software. The 3 D models are converted into drawing documentation. In conclusion, there are recommendations for practical implementation and evaluation of the work results.
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Design of extend the machine with the possibility of separating 3D prints
Gonda, Josef ; Tůma, Jiří (referee) ; Pavlík, Jan (advisor)
Separating of the metal 3D print from the print plate is a key step in most metal 3D printing methods. The author's goal is to design a device - a clamping mechanism that expands the functionality of existing band saws for metal by the possibility of comfortable separation of prints. In the beginning of the work, the author discusses the methods of metal 3D. Furthermore, the author focuses on the analysis of the market in the given issue and a brief description of the existing solutions of world/competing band saw manufacturers. Subsequently, the choice of a specific band saw is justified and the basic properties of the mechanism are determined. An essential part is the design of solution variants and the selection of a variant based on multi-criteria analysis. Furthermore, the author analyzes the design solution of the selected variant with a description of partial details, where he emphasizes compliance with the specified conditions and product optimization.
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Design of an automatic line for filling and sealing cups
Denk, Daniel ; Tůma, Jiří (referee) ; Hermanský, Dominik (advisor)
The aim of this diploma thesis is the design and structural development of a machine intended for the food industry. The machine fills plastic cups with the mixture, which it then closes with an aluminum lid. The product is marked with a use-by date and stored in an intermediate container. The result of the work is a 3D model of a single-purpose machine developed in the Creo Parametric program, drawing documentation of the machine and selected units.
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Dynamic simulations of linear displacement system of CNC milling machine
Gregor, Jiří ; Tůma, Jiří (referee) ; Klíč, Daniel (advisor)
This thesis deals with dynamic simulations of a linear feed system of a CNC milling machine in Adams View. Dynamic simulations enable better and faster decision making when designing new machines than prototyping. The aim of this work is to compare the torque waveforms on ball screws at working feed and at quick feed. The next task is to measure the forces acting on the load body. The values were obtained by simulation in Adams View and measurement on a CNC milling machine MCV Quick 754. The results were exported to Matlab. The resulting torque waveforms were compared, where they are relatively identical during working feed, with large differences during rapid feed.
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A design of manipulator for laser engraving device
Hanák, Jan ; Knoflíček, Radek (referee) ; Tůma, Jiří (advisor)
This thesis presents a research in the field of laser technologies used in industry and systems for laser marking of rotating parts. The output is a design of a laser cell that serves to mark rotating parts and that can be incorporated into an automated production line. The concept is developed in the form of a 3D model which is accompanied by necessary technical calculations and a justification of the choice of used components.
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Design of spindle for lathe
Novotný, Timotej ; Tůma, Jiří (referee) ; Pavlík, Jan (advisor)
The diploma thesis deals with the design of headstock of turning center. The introduction of the work is devoted to a brief description of turning centers and detailed description of individual parts of headstock. The main part of the work consists of determining the characteristics of the headstock, calculations necessary for design and dimensioning and calculations using the finite element method. The result of the work is a 3D model of the designed headstock and drawing documentation.
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Application of cooled Exhaust Gas Recirculation on modern gasoline engines
Bazala, Jiří ; Bauer, František (referee) ; Tůma, Jiří (referee) ; Píštěk, Václav (advisor)
This document describes the possibilities of increasing the efficiency of an internal combustion engine using cooled EGR (exhaust recirculation system), water injection and their combination. To investigate it the engine model was calibrated based on the experiment. It was investigated the effect of the externally cooled EGR system on key engine parameters such as efficiency, specific fuel consumption, performance and others on this model. Here it was concluded that EGR system has unsatisfactory parameters in terms of the ratio of achieved results and complexity. Therefore, the water injection model was tested on the model and compared with the EGR system. The engine model with water injection was evaluated as more advantageous. Therefore, it was decided to invest available sources to the experimental vehicle with water injection and verify experimental results with model. Using of both systems, the EGR system and water injection, and ideally with the possibility of pre-ignition, appears to be the most suitable combination with regard to the observed parameters.
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