National Repository of Grey Literature 549 records found  1 - 10nextend  jump to record: Search took 0.01 seconds. 
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.
Design of PET bottle recyclation device for creation of 3D printing filament
Huplík, Ondřej ; Kolomý, Štěpán (referee) ; Sedlák, Josef (advisor)
The rise in popularity of 3D printing and the increasing amount of plastic waste are putting an emphasis on finding new sustainable and environmentally friendly solutions. This thesis addresses the issue of recycling plastic materials and how PET plastic can be used in 3D printing. The theoretical part describes the current possibilities of plastic recycling. The practical part focuses on the design of a device that accepts a PET bottle strip and converts it into filament by bringing it above the glass transition temperature. The device is designed with cost and compactness in mind. The device can be further improved and adapted for different types of plastic materials.
Testing of sintered carbide cutting tools during high feed milling
Frank, Ondřej ; Vítek, Jiří (referee) ; Sedlák, Josef (advisor)
The aim of this thesis is to compare high feed milling tools from Dormer Pramet, s.r.o., which will use these results to complete the development process of a new family of tools. The tools were compared in terms of axial runout, chip evacuation and chip forming, temperature ratios and temperatures at the cutting area, roughness of machined surfaces and machine spindle loading, machining vibration levels and VBD cutting edge durability. The tests were carried out on the machined material X37CrMoV5-1 in two states, a soft state with a hardness of about 300 HB and a hardened state with a hardness of about 54 HRC. The thesis also includes a theoretical section dealing with high feed milling technology, tool wear and a description of the tested tools. The results obtained are summarized at the end of the thesis in a techno-economic evaluation.
Preparation and design of the production of bevel gears using the Reverse engineering method
Šimáček, Daniel ; Sedlák, Josef (referee) ; Slaný, Martin (advisor)
This thesis addresses the reverse engineering of the assigned gears. The first part is dedicated to a theoretical review of the issues related to bevel gears, strength calculations of the gearing and defects that can occur during operation. This is followed by the production of bevel gears with helical teeth and the most common heat treatment of gears. The second part emphasizes the actual process of reverse engineering, describing the digitization of gears and their conversion into a solid body in CAD software. After obtaining the key dimensions of the gear set, an analytical calculation of the load capacity in contact and bending is performed, accompanied by a numerical calculation using the finite element method to determine the bending stress at the tooth root. Dimension verification is conducted through dimensional analysis in specialized software to potentially reveal deviations and inaccuracies in construction based on 3D scanning. The final part deals with the design of the technological process for the production of gears, followed by a technical-economic assessment of the preparation and actual production of the gears. The drawing documentation was created based on the 3D volumetric models generated from the scanned gears
Design of technological equipment for remediation of wood infested by a bark beetle
Němec, Tomáš ; Osička, Karel (referee) ; Sedlák, Josef (advisor)
This bachelor thesis focuses on the design of technological equipment for the sanitation of wood infested by the spruce bark beetle. The main idea of the proposed technology is the combination of harvester logging with chemical sanitation using spraying. This innovative approach allows for increased sanitation efficiency and reduced costs compared to traditional methods such as manual debarking or using backpack sprayers. The results show that the harvester ensures uniform coverage of insecticide on each felled tree, thereby minimizing the risk of inadequate sanitation. The proposed technology also reduces the number of workers needed for sanitation, which contributes to further cost savings and increases the overall efficiency of the process. The thesis further addresses the technical aspects of the proposed equipment, including a detailed description of individual components such as nozzles, pumps, tanks, and control systems. Testing of the prototype demonstrated its high efficiency and reliability under various working conditions. In addition to technical benefits, the thesis also highlights the ecological advantages of the proposed solution, which minimizes negative impacts on the environment through precise dosing of chemicals and reduced need for manual handling of infested wood. Overall, it can be concluded that the proposed solution is not only economically advantageous but also technically and ecologically beneficial, and it should significantly contribute to the protection of Czech forests from the bark beetle calamity.
A Proposal and Optimization of Cutting Conditions for Turning of a Cemented Workpiece
Heiserová, Sofia ; Sedlák, Josef (referee) ; Kouřil, Karel (advisor)
This final thesis is aimed at optimalisation of hard turning process of cemented workpiece. First part is focused on the study of factors of hard turning. In the second part the work deals with the proposal and conduction of experiments of new cutting parameters in chosen factory. The durability of cutting edges is monitored. This monitoring is based on the evolution of roughness of machined workpieces. Based on the data evaluation, the best cutting edge is selected and used for final optimalisation experiments. Production cost of operational section is calculated for each alternative of cutting parameters in the third part of the thesis. Possible savings were calculated based on the number of machined pieces per year for the cutting edge that was found to have the best results.
Suggestion for rationalization of injection mould part production
Kamenická, Eva ; Kalivoda, Milan (referee) ; Sedlák, Josef (advisor)
The diploma thesis deals with suggestion for rationalization of production of an injection mould cavity plate and of a part responsible for cooling of the final plastic product. The main objective is to reduce the production time while meeting the high requirements for dimensional and geometric accuracy and surface integrity of the manufactured parts. The thesis starts with a theoretical analysis of the production of mould parts. This is followed by an analysis of the initial state of production, which consists of the characteristics of the previously mentionned manufactured parts, the available production means and a description of the original technological process. The experimental part of the thesis explains the procedures and justifies the choices made in the creation of new programmes within the CAM software Cimatron. Several possible variations of tools and cutting parameters have been experimentally tested and their final choice is justified in the thesis. The output of the thesis is a new manufacturing process for the production of both components, which has been applied in practice and evaluated on the basis of the results of testing the quality of the components and the plastic product itself. In the conclusion of the thesis can be found an evaluation of the output of the thesis and a time comparison of the previous process with the new suggestion. All experiments and measurements, including the production of the components themselves, were carried out in the toolroom of ITW PRONOVIA, s.r.o. in Veľká Bíteš, which is also the creator of the topic of this thesis.
On the cutting performance analysis of milling tools for a selected application.
Němeček, Lukáš ; Sedlák, Josef (referee) ; Píška, Miroslav (advisor)
The presented diploma thesis is devided into two parts. The theoretical part deals with types of milling, the choice of the cutters, choice of material of exchangeable cutting plates and also with types of wear and their classification. The second part of the thesis deals with experiments where the power load of the tool was measured. The observed data were processed and graphs of power load were created by software. Conclusions are based on these graphs.
Solution production technology of part "laparoscopy instrument´s jaw" on a CNC machine
Pospíchal, Oldřich ; Sedlák, Josef (referee) ; Kalivoda, Milan (advisor)
Bachelor thesis submitting a proposal for the production of components of the laparoscopic instrument machined on CNC machine. Based on the analysis of components of design, technological and material aspects, is developed technological process of production, processed technological documentation, compiled and verified NC program for the CNC machining center. The thesis compares manual and automated programming, evaluates manufacturing of jaws and assesses possible monthly production capacity of one machine.
A proposal and manufacturing of temporary dental restoration
Jiroušek, Jan ; Sliwková, Petra (referee) ; Sedlák, Josef (advisor)
This bachelor thesis deals with manufacturing of temporary dental restoration. Theoretical part contains an overview of types of dental restorations and their division, Furthermore it states important properties and division of the dental materials used nowadays. The next point of theoretical part is an overview of the technologies of dental restorations manufacturing used at present. Practical part is aimed at manufacturing of temporary dental restoration by using the digitization by intraoral scanning, design of restoration in CAD software and CAD/CAM manufacturing. The thesis is concluded with discussion comprising a summary and evaluation of the results of single steps from practical part.

National Repository of Grey Literature : 549 records found   1 - 10nextend  jump to record:
See also: similar author names
11 SEDLÁK, Jakub
15 SEDLÁK, Jiří
2 Sedlák, J.
11 Sedlák, Jakub
10 Sedlák, Jan
9 Sedlák, Jaroslav
15 Sedlák, Jiří
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