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Design and realization of CO2 laser with power up to 100W
Šrenk, Jakub ; Dvořák, Jaromír (referee) ; Slaný, Martin (advisor)
This work is focused on the problematics of small CO2 lasers and their possible use for commercial production. The first part describes devices available on the market and evaluation of their parameters. The practical part specifies the parameters that arise from the potential use of technology. Based on these parameters, design of the machine and its complete mechanical design are elaborated. Furthermore, the experimental part deals with the design of structural components, control system, electrical systems and in general a complex technical-technological solution of the equipment, including economic evaluation of the design. Part of the work is also the construction of the machine itself, including activation, adjustment and debugging for the considered production. The constructed machine was subject to testing to ensure required quality of production.
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Simulation of a temperature field of the FDM printhead
Rousek, Jakub ; Dvořák, Jaromír (referee) ; Zemčík, Oskar (advisor)
The aim of this thesis is to analyze the thermal behaviour of the printhead used on RepRap 3D printers. The main focus was on heatbreak zone, where are located important processes in terms of softening and melting of materiál. For choosed printheads is looked at effect of their design on the temperature profile and lenght of thermoplastic transition phase. For the purpose of simulations, 3D models were created using CAD system. These models were then used as vase for the simulation models of temperature distribution and spreading. The prinhead used for CR10 printer reach significantly worse result of heat distribution in heatbreak for model with bolt attachment between heat block and heatsink. This attachment is increasing temperature at the bottom of of heatsink and also increasing length of transition zone. The same attachment is look at for the second type of printhead – A10M. Here is difference less noticable. The heat transfer by attachment bolts is compenzated by reducing thickness of wall in the heatbreaks. For the printhead type diamond was deemed necessery usage of insulation materiál between heat block and rst of the components. Insufficient insulation is increasing risk of clogging and thermal damage to construction supporting fan.
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Cutting and non-cutting operations
Hordějčuk, Jakub ; Dvořáková, Jana (referee) ; Dvořák, Jaromír (advisor)
Creating of any part may be by many ways, the choice of a particular method depends on many factors. The point of my bachelor's thesis is to present the currently most commonly used method of metal cutting. Gradually I introduces the most popular method of the metal cutting, the principles and usability. The first part is a presentation of theories and methods of cutting operations and the second one of a method non-cutting operations. To the different methods there are examples from practice.
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Hobby milling machine design
Valášek, Ondřej ; Zemčík, Oskar (referee) ; Dvořák, Jaromír (advisor)
At the introductory part, this thesis deals with description of individual parts of construction and control of CNC machine. Individual parts are described by vievpoint of principle of function, attributes and possibility of implementation on hobby machine. Furthermore is performed brief analysis of commercially manufactured CNC milling machines, which can be purchased on domestic and foreing markets for a purpose of milling wood and eventally aluminuum alloys. Main purpose of thesis is custom desing of CNC milling machine for non-commercial use. Three draft proposals are created first. Then one of them is developen into complete proposal. This design is then subjected to numerical simulation to pre-determine the machine's stiffness and ability to milling aluminium. The result of this simulation confirms the possible use of the machine for milling aluminium alloys. According to the simulation, the maximum deformation for possible machining of aluminium under predetermined conditions is 0.18 mm. In the last part of the work a price calculation was made, determining the approximate cost of the machine production at 75 000 CZK. The work includes a complete drawing documentation of the mechanical parts of the machine.
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Machining of rotating Body-part on CNC lathe
Dlouhý, Vít ; Dvořák, Jaromír (referee) ; Kalivoda, Milan (advisor)
This master's thesis is focused on the technology fundamentals of machining for the use of the CNC lathe which was used for machining the required parts are made of stainless steel. In the introduction are mentioned the historical milestones related to machine tools. In the following chapter is analyzed machining process and related fact. A follow-up chapter contains the parameters common to a modern machine tool CNC machines. Followed by the practical part with the characteristics of the machined components. The next chapter includes a selection of CNC lathe for production. Continued by selecting the appropriate cutting tool and adjusting the machine for the given component. They were applied a total of three variants of production with the subsequent evaluation. In conclusion, it became established fact, for example, the advantages of the shape tools or the use of more spindles during the machining.
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Micro-grinding applications in high precision manufacturing focusing on surface quality
Macháčová, Veronika ; Dvořák, Jaromír (referee) ; Žídek, Jan (advisor)
The object of this bachelor thesis is to write a research study dealing with micro-grinding technology. Increasing the requirements of components and dimensional accurancy (in micrometer units), further the requirement of high surface quality and the application of a wide range of difficult to process materials has led to the development of this technology as an independent field. The content is overview of the micro-grinding process with its advantages and disadvantages, used tools and their machining, micro-grinding machines and an example of aplication in various areas of industry.
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A concept of a revolver hammer manufacturing process
Talanda, Jakub ; Dvořák, Jaromír (referee) ; Sliwková, Petra (advisor)
The objective of this thesis is to propose a manufacturing procedure for the selected part, the Alfa revolver hammer. The paper begins with a short design summary of the part, considers available materials and bar stock, examines individual stages of the manufacturing process and makes a simple economic calculation. It concludes with a series of steps recommended for further action towards full-scale production.
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Production of Pattern Equipment for Casting Pump
Suchomel, Martin ; Dvořák, Jaromír (referee) ; Kalivoda, Milan (advisor)
The bachelor thesis focuses on the design of foudry technology, design and production of pattern equipment for castiong of pump from cast iron ČSN 42 2420. The practical part elaborates design of technology and pattern equipment in CAD system SolidWorks. Simulation of casting was made in CAE system ProCAST. For design of milling technology was used CAM system HSMWorks. On the CNC machines was machined model, core box and underlay. Result of my thesis is pattern equipment for moulds and cores for the casting. In the end was made molds, cores and five samples of casting was casted.
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Solution of modernization technology of part air-pump
Černý, Michal ; Dvořák, Jaromír (referee) ; Kalivoda, Milan (advisor)
The subject of this thesis is modernization of manufacturing process of air-pump component in a specific company. The work is focused on designing a new variant of the manufacturing process for mass production of the given component. The introduction evaluates the technology of product manufacture and describes the existing technologies of performed prototype production. The second chapter introduces a machine-tool, which will play the existing role of production, which will streamline the productivity of work, reduce the risk of human error and improve the quality of manufacturing accuracy. Further new tools are selected and a new production technology is designed. In conclusion, machine times and an overall design of production are evaluated.
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