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Optimizing of die geometry for wet drawing of a steel wire with process fluid
Bršťák, Ondřej ; Zmrzlý, Martin (referee) ; Píška, Miroslav (advisor)
The subject of this diploma thesis was both the analysis of the wire drawing process and the design of a new drawing die. All tests were performed at real production line. The primary aim of the analysis was the change in the current lubricating medium. Based on the performed analysis the test was developed to determine the exact values of the friction coefficient of the new lubricant. In the following part of the thesis the wire manufacturing process was described with a focus on the performance of the drawing die. For that matter material tests were performed and a material model was developed and then used for further calculations. Based on the results the geometry of the drawing die was changed and hence the drawing process was optimized with the focus on both increasing the lifetime of the drawing die and maintaining the complexity of the production. First drafts of new drawing dies were created and cost savings were calculated. In the last section the next modifications were proposed to increase the lifetime of the drawing dies.
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Production technology of a specified part
Tříletý, Vlastimil ; Sliwková, Petra (referee) ; Píška, Miroslav (advisor)
This diploma thesis deals with the design of the technology of production of machine parts in the company Walter s.r.o. The theoretical part deals with the technological possibilities of part production, the classification of cast irons and their machining, selected machining technologies at CNC milling centres and cutting tools suitable for this production. In the practical part, some technological analysis is done on the basis of which machining equipment is available in the company's machine park. The clamping fixture and clamping forces are designed for fastening of the parts. An advanced manufacturing routine is worked out according to given technical drawings, including the costs evaluation.
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Design of production technology for a distribution block
Večeřa, Jiří ; Píška, Miroslav (referee) ; Sliwková, Petra (advisor)
The master's thesis focuses on the design of manufacturing technology for a selected component made of ductile iron EN-GJS-400-15. The theoretical part of the thesis discusses the technologies used in component manufacturing, such as turning, milling, drilling, surface grinding, honing, thermal energy debburing and phosphating. The subsequent sections specify the specific production machines and cutting tools utilized in the component manufacturing process. In the practical part, a technological procedure is proposed, describing the sequence of manufacturing operations required for producing the component. It also includes inspection operations for measuring tolerances. Additionally, manufacturing instructions are provided, offering a detailed description of individual manufacturing operations and specifying the frequency of tolerance checks. The thesis concludes with a technical-economic evaluation, summarizing the material costs for production preparation, the costs for ensuring the production itself, and evaluating the manufacturing technology.
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Design of technology for gear manufacturing
Urbánek, Michal ; Píška, Miroslav (referee) ; Sliwková, Petra (advisor)
The master’s thesis is focused on the design of production technology and the choice of machines and tools to achieve the required accuracy according to the drawing documentation. During the design of production options, the advantages and disadvantages of gear machining variants were described. In the theoretical part, the technologies of the proposed operations were described, such as turning, milling of gears in a rolling method, shaving and grinding. In the practical part, the production itself is described in all sixteen operations that were needed to produce the part. Instructions and tables of measured dimensions were created for each machine operation. The economic evaluation summarizes material costs, machine and preparation times depending on the size of the production batch.
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An effective cutting tool for shearing of spring wires
Smékal, Jan ; Sliwková, Petra (referee) ; Píška, Miroslav (advisor)
The goal of this master thesis was to propose modification of a cutting tool for shearing of spring wires with focus on improving its lifetime. An analysis of cutting process was made which confirmed low lifetime of lower cutting tool – average lifetime of cutting tool is 3 734 pieces. Suggestions were made in the thesis such as change of current technology, change of material of cutting tool or local change of cutting edge of the tool. Three changes were designed – insert from sintered carbide, hardfacing welding of the cutting edge and insert from high-speed steel. Testing of sintered carbide inserts ČSN ISO 513 HC – P80 and ČSN ISO 513 HC – P60 showed that sintered carbides are too brittle for cutting spring wires. Five hardfacing welding materials (HS6-5-2, HS2-9-2, X37CrMoW5-1, Stellite6 and Stellite12) have been tested. Material X37CrMoW5-1 had the best lifetime results with lifetime of 2 463 pieces. This material was further tested and average lifetime achieved was 2 021 pieces. However, there was decrease of hardness in a heat-affected zone. The last change of cutting edge was an insert from high-speed steels HS12-1-4 and HS10-4-3-10. These inserts were broken prematurely at the soldered joint and both high-speed steels exhibited cracks due to high material hardness (60 and 65 HRC), very low toughness at extremal loading.
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Dry electrolytic polishing technology of Ti-6Al-4V alloy
Karešová, Pavla ; Sliwková, Petra (referee) ; Píška, Miroslav (advisor)
The main part of the thesis deals with the finishing method of machining called DryLyte electrolytic polishing method. General concepts for measuring surface structure are also mentioned. The experimental part deals mainly with the study of the surface texture parameters of the turned sample before and after the application of the DryLyte method. The work shows that this is a very promising method for finishing metal-bonded materials, which can be used to obtain mirror-gloss surfaces, while the method itself does not require bulky and expensive equipment. In terms of surface finish quality, this method results in a reduction of surface roughness and an improvement in both surface and volume characteristics, always to the benefit of strengthening the core of the material.
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Design and production of selected 3D printed metallic parts
Masson, Quentin ; Polzer, Aleš (referee) ; Píška, Miroslav (advisor)
Thales LAS France currently has parts of their system that are manufactured by forging or casting. Nowadays the tools and equipment for those processes are getting worn, the sub-contracting company in charge of some of casted parts can’t guarantee the quality of those parts anymore. Moreover, Thales recently has set up a plant specialized in metallic additive manufacturing and the policy of production is to encourage the production in that subsidiary. In order to adress those issues, Thales LAS France managed to prepare his design office for designing parts that will be 3D printed. My function is to establish a methodology for the mechanical design of parts that will be manufactured in additive manufacturing. Once the researches about the process and the different technologies will be done, I will establish steps that must be achieve for the mechanical design of a piece or a system. The methodology will take into account the physical properties that can be guaranteed by the process and their flaws such as the porosity for instance, the constraint linked to the technology and if possible apply to the part a topological optimization.
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Modern finishing methods of implant processing
Večeřa, Tomáš ; Ohnišťová, Petra (referee) ; Píška, Miroslav (advisor)
This paper provides a general overview of joint implants and an overview of used contemporary materials and methods of fabrication of implants, including additive methods. More attention is paid to finishing methods of drag finishing and a new method of dry electropolishing used in DLyte system. In the experimental part, an experiment for analyzing and comparing the effect of DLyte system on a sample surface is proposed. Six samples of titanium alloy Ti6Al4V with different initial roughness are prepared. Their initial surface structure is studied.
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Coating of tools by the PVD HiPIMS technology
Havlíková, Tereza ; Ohnišťová, Petra (referee) ; Píška, Miroslav (advisor)
This bachelor’s thesis is aimed on the study of PVD coatings of tools with a focus on HiPIMS (High Power Impulse Magnetron Sputtering) technology. As part of the research, the PVD coating methods are presented, then the basic physical processes and characteristics of magnetron sputtering are described and finally the HiPIMS technology is analysed. The aim of the experimental part of this study is to evaluate (Al,Ti)N coating deposited by HiPIMS technology on a wire drawing die. For coated and uncoated die, the wear of the die, surface quality and thermal impact on the wire are observed and compared.
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