|
|
Application of modern technologies for production of complex shape surfaces
Varhaník, Matúš ; Sadílek, Marek (referee) ; Drbúl,, Mário (referee) ; Sedlák, Josef (advisor)
A set of modern production technologies was applied in the design and production of the individualized femoral component of the total knee endoprosthesis. Before starting the design of the implant itself, the Ti6Al4V material produced by SLM 3D printing technology was tested in terms of tribological contact with the articulation member made of high molecular weight polyethylene. The obtained results confirmed the possibility of using this technology for the production of the semi-finished product of the intended implant. Another series of tests gradually defined the characteristics of the technological-production process in terms of the direction of printing, heat treatment, the method of processing the functional surface and the morphology of the surface. The deposition of coatings using PVD technology was aimed at increasing the functional properties of the implant, such as antibacterial properties, reducing friction and increasing wear resistance. Coatings testing in the categories of topography, adhesion, cohesion, delamination and coefficient of friction successively generated a winner from among the 3 tested coatings (TiN, WZrB, TiCC). The final part of the dissertation frames the acquired knowledge and transfers it to the pre-production and production phase of the creation of the femoral component of the total knee endoprosthesis. During this phase, knowledge from the field of reverse engineering, construction and chip machining technology is applied. The output of the work is an implant, the production of which included the use of a total of 4 reverse engineering software solutions, CAD/CAM support, CNC milling of general surfaces, polishing of the functional part and PVD coating.
|
|
|
Laser treatment of the surfaces of small human joints
Křístek, Mikuláš ; Odehnal, Lukáš (referee) ; Ranuša, Matúš (advisor)
Nowadays, in osteoarthritis of small joints, total endoprostheses are used to ensure physiological movement; unfortunately, the durability of these joint implants is very limited. The most frequent wear occurs in the contact area of the implants with the articulating surface. The use of microtextures appears to be beneficial in influencing tribological properties, but this issue is not well described. This bachelor thesis investigates the effect of different microtextures on the coefficient of friction, the movement of proteins in the synovial fluid in the contact area, wear, and the surface topography. Measurements were made using a reciprocal tribometer, optical profilometry and fluorescence observation. The textured samples achieved an increase in the coefficient of friction in the contact region. The results show that surface texturing can significantly affect the coefficient of friction in the contact region, which contributes to the reduction of wear and extension of endoprosthesis life.
|
|
|
Analysis of material to be machined influence on the wear and tool durability
Tolkner, Josef ; Novák, Zdeněk (referee) ; Bumbálek, Bohumil (advisor)
Machining technology is a multi disciplinary field, and together with the economy are playing always more important role in the success of the enterprise market products and services. Recent studies show that it requires very close link between technology, management and information technology such as the integration process and production planning, simulation of manufacturing systems, production flexibility, virtual machines, control algorithms, etc. The key changes are based on the requirements for miniaturization of products, higher production accuracy, closer tolerances, better surface quality, part of weight reduction, reduction of lot size and reducing production costs. The report is focused on machining titanium alloys. In the theoretical part are presented the properties and the distribution of titanium alloys. In the practical part is then carried out an experiment aimed to influence the composition of workpiece material on tool wear. Experiment results and recommendations are listed at the end of this report.
|
|
|
On the production of dental parts
Lekeš, Jonáš ; Polzer, Aleš (referee) ; Píška, Miroslav (advisor)
Tato práce popisuje části dentálních náhrad, lékařské pojmy, které se s nimi vážou a vysvětluje proces a problematiku koncepce a výroby těchto částí. Různé druhy biomateriálů jako kovy, keramika, polymery či kompozity jsou zde popsány, hlavní důraz je však kladen na titanové a chrom kobaltové slitiny a korozivzdorné oceli. Experimentální část nabízí 2 řešení zlepšení výroby součásti. První část experimentální části se zabývá zlepšením kvality styčné plochy pilíře zvýšením hustoty síťování součásti. Druhá část nabízí nahrazení operace frézování operací vrtání. Byly vybrány nástoje od 4 výrobců. Pro nalezení vhodného nástroje jsou provedeny 2 testy vrtání a vybrán nástroj vhodný pro obrábění titanové a chrom kobaltové slitiny.
|
|
|
Material development of dental implants
Legerský, Radek ; Borák, Libor (referee) ; Florian, Zdeněk (advisor)
The study deals with the development of materials currently used in the manufacture of dental implants. Special attention is paid to chemical composition, mechanical properties and biocompatibility of these materials. The aim and result of the thesis is creation of comprehensive overview of the different material groups, which are characterized by their quality and appropriateness of use. Benefit is an assessment of titanium alloys, which exhibit excellent properties both in terms of mechanical, chemical and biocompatible.
|
|
|
Applications of titanium alloys
Košťál, Jan ; Kaštyl, Jaroslav (referee) ; Němec, Karel (advisor)
This bachelor thesis will deal with titanium and titanium alloys, their properties and appropriate application in mechanical engineering and other branches. The first part is devoted to the pure titanium, describes technology of production, there are also briefly mentioned physical, chemical and mechanical properties, and according to them the position of titanium among other elements. The main part is focused on the different types of titanium alloys, their properties, production and processing. The conclusion is devoted to the use of pure titanium and its alloys in different industries.
|
|
|
Machining of materials for specific dental applications
Těšík, Martin ; Sedlák, Josef (referee) ; Píška, Miroslav (advisor)
This diploma thesis is focused on dental materials used in prosthetic medicine. In the introduction, the most important characteristic of dental materials is summarised, which is biocompatibility. Further it contains distribution of nowadays used dental materials, which are oxidic ceramics and titanium alloys. It describes pitfalls of machining of those materials. Final part is devoted to process of the production of the new dental crown, from the first arrival of the patient to the machining of final product. The thesis also compares the economics of dental crown production using milling and 3D printing.
|
|
|
Proposal and Implementation of Production of Dental Plate Construction
Dusbaba, Michal ; Chladil, Josef (referee) ; Sedlák, Josef (advisor)
This thesis deals with a CAD programmed construction design of dental prosthetics and its subsequent production by means of a five axis machine tool. In the theoretical part of the thesis one can find characteristics and analysis of materials designed for a production of dental prosthetics constructions. Among other things, the practical part of the thesis follows up digitization of a patient´s oral cavity part with the use of Trios intraoral scanner representing the latest scanning technology. The obtained data created a basis for a design of the respective dental prosthetics construction using the shape dental system programme called DentalDesigner 2015. Furthermore, the paper deals with a production of a dental prosthetics construction by means of a five axis machine tool and pursues completion works which resulted in the prosthetics final shape. The paper is concluded with discussion comprising a summary of results acquired in the practical part beginning from dental implant introduction to insertion of the made prosthetics construction into the patient´s oral cavity.
|
|
|
RF-ICP deposition of bioactive hydroxylapatite coatings
Dukovský, Daniel ; Kelvin Zhi Cheng Loke, Ph.D (referee) ; Čížek, Jan (advisor)
Tato diplomová práce se zabývá problematikou plazmového nanášení bioaktivních keramických povlaků hydroxylapatitu s využitím technologie radio-frekvenčně buzeného indukčně vázaného plazmatu. Cílem bylo optimalizovat proces a nanést kompaktní hydroxylapatitové povlaky na substráty z titanové slitiny Ti6Al4V. Nanesené vzorky byly následně podrobeny analýzám povrchové drsnosti, mikrostruktury a fázového složení. Ze získaných výsledků byly vyvozeny závěry, které byly srovnány s dalšími odbornými pracemi zabývajícími se příbuznou problematikou.
|
|
|
Electron beam welding of Ti 6Al 4V
Skalka, Jan ; Dupák, Libor (referee) ; Mrňa, Libor (advisor)
The thesis is dedicated to welding combination of titanium alloy Ti-6Al-4V and austenitic steels 1.4301 by electron beam. Based on literature studies of bonding titanium and its alloys with steels, it was proposed to select for welding interlayer of copper, which could limit the impact of intermetallic phases on the mechanical properties of the weld seam and enable the creation of weld. For welding the pipe samples were used three methods of welding with various welding parameters. Samples which remain after thermal cycling vacuum-tight, were then further analyzed (micro-hardness, tensile test, etc.).
|
guest ::
