National Repository of Grey Literature 121 records found  1 - 10nextend  jump to record: Search took 0.00 seconds. 
Evaluation of washing effect on material properties after 3D DLP printing
Uvíra, Dominik ; Jaroš, Aleš (referee) ; Zemčík, Oskar (advisor)
This thesis focuses on the influence of washing on the mechanical properties of 3D DLP printed parts. The aim of the thesis was to experimentally determine the impact of washing agents with different wash durations on the mechanical properties of 3D printed parts using DLP technology. The research describes the devices and materials used. Furthermore, an analysis of washing 3D DLP printed parts is conducted, including a description of polymer dissolution, types of washing agents, and washing methods. Based on the research, materials were selected, including Standard resin, ABS-like resin, and Tough resin. The used washing agents are IPA, Simple Green industrial degreaser, DPM, and a special uncured resin remover called EasyClean. Samples were produced on the DLP 3D printer Anycubic Photon D2, and printing profiles were established based on the research part and own calibration. In the first experiment, the effectiveness of the agents in removing uncured resin was monitored. This was followed by an experimental evaluation of the tensile properties of the prepared samples. Furthermore, the notch toughness of each material was evaluated. In both cases, an analysis of fracture surfaces was conducted. Based on the achieved results, optimal washing durations were determined for all material and rinsing agent combinations, and areas of application were recommended. Subsequently, a custom rinsing agent combining low cost and good mechanical properties was proposed. The final part of the work consists of an economic evaluation of the various rinsing agents, resulting in specific recommendations for purchasing rinsing agents and rinsing duration.
Machining of components for hydraulics
Piroš, Viktor ; Jaroš, Aleš (referee) ; Kalivoda, Milan (advisor)
The main motivation of this final thesis is the draft and verification of the interchangeability of grinding technology for a more efficient machining method, namely the technology of precise turning. The aim is to reduce the production costs of one of the components of the hydraulic assembly. The introductory chapter is devoted to the analysis of the manufactured component and its application, the analysis of the current manufacturing process and the justification of the proposed interchangeability. The subsequent theoretical part is designed so that the summarized knowledge can be used in the practical part. Its content is the design of the machine tool, cutting tools, cutting and process conditions, the method of clamping the semi-finished product, the machining cycle and the time standard. At the end of the practical part there is a technical and economic evaluation of the precision turning process, focusing on the quality of the machined surface, dimensional stability, roundness stability and evaluation of time and cost savings. The conclusion of the thesis is a brief summary of the findings and results of the proposed process and its subsequent implementation.
Influence of surface roughness on optical properties of machined materials
Ashqar, Ghaith ; Jaroš, Aleš (referee) ; Kupčák, Radim (advisor)
První, teoretická, část této bakalářské práce se věnuje problematikám souvisejícím s výrobou mechanických položek pro optické přístroje. Poskytuje úvod k parazitnímu světlu a přehled způsobů jeho eliminace. Následuje obecná část zabývající se soustružení a sekce věnovaná měření drsnosti povrchu. V praktické části jsou tyto poznatky zúročeny v podobě návrhu a následné výroby prototypového vzorku který bude sloužit k vyhodnocení vlivu drsnosti povrchu na množství parazitního světla v optickém přístroji. Drsnost povrchu jednotlivých vzorků byla změřena a porovnána s teoretickou hodnotou získanou výpočtem. Prototyp byl vyvinut v úzké spolupráci s R&D oddělením přerovské firmy Meopta – optika, s.r.o. Na základě budoucích zkoušek a měření bude vyhodnoceno, zda je autorem navrhovaná inovace aplikovatelná v oblasti přesné mechaniky a optiky.
Turning machines and tools, production of a sample part
Šaroun, Martin ; Jaroš, Aleš (referee) ; Kupčák, Radim (advisor)
This bachelor's thesis provides an overview of turning technology in the research part. It describes the basic terms and terms, deals with the division of lathes and turning knives. The practical part of the work is focused on the technological processing of the specified part, which is the assembly mandrel used for precise gluing. The technological process was developed and in cooperation with the company, the production of its own component took place. In the last phase, the final inspection of products and evaluation took place.
Selection of the optimal VBD geometry for a given technology
Šuga, Samuel ; Jaroš, Aleš (referee) ; Fiala, Zdeněk (advisor)
This thesis is focused on testing the roughing of different geometries of negative D-type tools during turning long thin parts with a slenderness ratio of 15 or more. 5 tools were selected for this task. Data from the cutting process was measured using a dynamometer, accelerometer and microphone for sound recording. The results are evaluated using FFT analysis and other signal processing methods as graphical outputs. The aim is to select the most suitable type of geometry for this application.
Ball screw testing
Kukliš, Richard ; Jaroš, Aleš (referee) ; Fiala, Zdeněk (advisor)
The main goal was to design a test rig and create a methodology for evaluating the measured data from the life tests of linear motion systems with ball screws. The first part is the research of basic knowledge about ball screws, which are important for understanding the behavior of the entire ball screw motion system and methods created from previous experiments on similar issues. The next part of the thesis is directed at the design and selection of individual parts and sensors for the testing rig. The methodology is based on the evaluation of measured parameters describing the condition of the tested ball screw and it includes verification of the functionality of the test rig from the first measured data.
Design of a combined tool for holes machining of the universal chuck
Kovář, Matouš ; Fiala, Zdeněk (referee) ; Jaroš, Aleš (advisor)
This master’s thesis focuses on the design of a combined tool for machining holes of a universal chuck. The thesis analyses the component and technologies used for the production of precision holes for pinions in the chuck body. Furthermore, the current production of precision holes is described, including the used machine, tools, cutting conditions and technological process with machine times. In the next part of the thesis, a proposal of more efficient production of precision holes is made accompanied by a design of a combined tool. The design includes its structural treatment, used cutting tool inserts and drill, the method of clamping, used material, the heat treatment, the determination of the cutting conditions and the development of a new technological procedure. The thesis concludes with a technological and economic evaluation, where the existing and the newly proposed technologies for the production of precision holes for pinions in the chuck body are compared.
Design of equipment for welding head path correction
Benáček, Filip ; Jaroš, Aleš (referee) ; Slaný, Martin (advisor)
The work presents the problem of welding of membrane walls intended for application in power boilers. Furthermore, the use of the MIG/MAG method for welding and the advantages of using the CMT method. An innovation has been made for the welding process in the form of laser scanning of the surface and subsequent use of the data to correct the welding head. This led to the automation of the whole process. Because of the necessary testing of the laser scanner function, a test structure was designed and constructed. It was necessary to consider the appropriate wall scanning strategy and subsequent data processing in terms of the overall manufacturing process. The software designed to evaluate the scanned profile placed a point using a suitable tool on the scanned profile. The set of points was further filtered for a smoother resulting path formed by these points. The resulting points were fed to the output signal from the laser device to correct the path of the welding head. Both the welding and the surface scanning will be done simultaneously, so the settings for the laser scanner were created and stored in the internal unit of the device. This allows the laser to operate without connecting to a computer.
Symptoms, Causes and Overcoming Burnout among Teaching Staff
Jaroš, Aleš ; Mojžíšová, Jarmila (advisor) ; Nováková, Daniela (referee)
This thesis deals with burnout among teaching staff, its symptoms, causes and possibilities of overcoming. The theoretical part describes the teaching profes- sion and shows its strenuousness. It also focuses on the personality of teachers and their ethical principles. It describes the required core competencies of tea- chers and, equally important, the need for professional self-realization, which, if fulfilled, can help prevent burnout. The author analyzes the symptomatology of burnout syndrome, its causes, risk factors, stages and ways of prevention. The practical part examines the main factors influencing teachers' professional fulfillment, their place on an imaginary scale of personal preferences, and if the teachers perceived them negatively or positively. It also tries to determine whether there is a link between the professional and personal satisfaction of teachers as a possible prevention of burnout.
The use of lateral thinking for solving company problems
Jaroš, Aleš ; Mužík, Jaroslav (advisor) ; Šerák, Michal (referee)
With creative thinking we can identify general methods of problem solving, look at real life from another point of view. The method of 6 Thinking Hats is one of the creative ways to do so. The aim of this thesis is a complex review of using this method when solving a problem in a group. It tries to show creative thinking by which the group should get a certain outcome in solving the problem. The thesis analyses thoroughly all the parts of the 6 Hats method, and at the same time, it tries to view other perspectives on the workings of the method. A significant part of the thesis is aimed at the instructor, who decides to use this particular method, and his work. It should be an instrument to use for application of the 6 Thinking Hats method on a specific company problem.

National Repository of Grey Literature : 121 records found   1 - 10nextend  jump to record:
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5 Jaroš, Adam
3 Jaroš, Antonín
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