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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
41

Uso de usinagem por jato de água, usinagem por controle numérico computadorizado e corte a laser no design de superfícies tácteis a partir de padrões modulares encaixáveis em ágata e cedro

Silveira, Flávia Lopes da January 2011 (has links)
Este trabalho tem por objetivo o design e a fabricação de superfícies tácteis a partir de padrões modulares encaixáveis. Estas superfícies foram construídas em diferentes materiais naturais (minerais e madeiras) e em distintos processos de fabricação inovadores (usinagem por jato de água, usinagem por controle numérico computadorizado ou CNC e corte a laser). A intenção foi desenvolver uma metodologia de design & tecnologia para aplicá-la em painéis de revestimento que possam ser produzidos em baixa escala de forma semi-industrial. A grande variedade de materiais naturais encontrados no estado do Rio Grande do Sul; a carência de design associado a estes materiais quando do produto final e o volume de rejeitos oriundos deste beneficiamento, foram os principais motivadores para a utilização destas matérias primas. O estudo de diferentes técnicas de design de superfície auxilia na transformação destes materiais, para que os mesmos passem a ter o formato de módulo. Dentro deste contexto, foram estudadas as técnicas desenvolvidas pelo artista Maurits Cornelis Escher. Ele dedicou boa parte de sua vida profissional à composição de desenhos que, justamente, partem da utilização da simetria, modularidade, continuidade e encaixe. Neste sentido, após a compreensão das técnicas utilizadas por Escher, alguns de seus desenhos foram aplicados nos materiais selecionados através dos processos de fabricação adequados, possibilitando a construção das diferentes superfícies tácteis. Os resultados obtidos identificam que a utilização de processos de fabricação inovadores para interferência nos materiais naturais são ferramentas importantes para a promoção de uma nova geração de produtos locais. Conclui-se que estas interferências viabilizam a fabricação de produtos com maior valor estético, social e econômico. / This work aims at the design and the manufacturing of tactile surfaces from modular plug patterns. These surfaces were built in different natural materials (mineral and wood) and in distinct innovative manufacturing processes (waterjet machining, computerized numerical control machining or CNC and laser cutting). The objective was to develop a design & technology methodology for applying it in coating panels that can be produced on a semiindustrial small scale. The huge variety of natural materials found in Rio Grande do Sul State, the lack of design associated to these materials as to the final product and the volume of waste from this processing were the main motivators for the use of these raw materials. The study of these different techniques of surface design helps the transformation of these materials in order that they start to have the modular format. Within this context, the techniques developed by the artist Maurits Cornelis Escher were studied. He devoted much of his professional life to the composition of drawings beginning exactly with the use of symmetry, modularity continuity and joint. In this sense, after understanding the techniques used by Escher, some of his drawings were applied in the materials selected through suitable manufacturing processes, enabling the construction of different tactile surfaces. The results obtained identify that the utilization of innovative manufacturing processes to interfere in the natural materials are important tools for the promotion of a new generation of local products. It is conclude that these interferences enable the manufacture of products with greater aesthetic, social and economic value.
42

Digitální zprovoznění robotizovaného systému pro laserové řezání / Digital commissioning of a robotic production system for laser cutting

Žaludek, Jan January 2021 (has links)
This diploma thesis deals with digital commissioning of a robotic production system for laser cutting. First part of this thesis sums up teoretical knowledge of virtual commissioning, fundamentals of laser and laser cutting and system analysis of such a workplace. In practical part of this thesis, the workplace was designed including the workpiece clamping. The design and the digital commissioning itself was mediated by the software RobotStudio. In the programming language RAPID a control program was made and tuned. The workoplace was then virtually commissioned. For easier handling a user interface on FlexPendant was made.
43

Nestabilita řezu při dělení mezních tlouštěk plechů laserovým paprskem / Unstability cut of laser beam at dividing limiting gauge thickness

Kadlec, Zdeněk January 2008 (has links)
This thesis deals with the possibilities of cutting strong steel metal sheets by means of laser and problems rising from the incision, their technological investigation. The basic philosophy consists on the research of the interaction between laser bunch and material, depending on the position of focal poin and sequential results in spec. heat. It determines the main parametres of the incision (from the total quantities and matematical description) which have the biggest effect on the occurence of wide cut and perhaps even on the quality of products and consequential optimalization of these quantities.
44

Racionalizace malosériové výroby výpalků v podmínkách firmy PARS Nova a.s. / Rationalization of small-lot production of slops in conditions of company PARS Nova a.s.

Jurka, Pavel January 2008 (has links)
Analysis of the technological possibility ray methods of protoplasm, laser and water jet on the part of needs company Pars Nova a.s.. Propsal concrete of unconventional method. Process layout and exigencies of working designed method. Security and ecological diversification of designed method. Technical – economics evaluation contribution designed of unconventional technology.
45

Využití nekonvenčních paprskových technologií (LASER/vodní paprsek) ve strojírenství / Utilization unconventional beam technology (LASER/water jet) in machine

Horáček, Lukáš January 2008 (has links)
This thesis deal with utilization unconventional beam technology (LASER/ water jet) in machine. The aim works is analysis technological possibility method laser and analysis technological possibility method water jet. Further aim of this work is mutual trade-off of the both methods unconventional beam technology and technical economic interpretation.
46

Laserové řezání s podporou vzduchu / Laser cutting with air pressure assistance

Kramoliš, Lukáš January 2010 (has links)
This project, elaborated within the engineering studies (code of field of study: N2301), deal with air supported laser cutting and its practical usage in industry. The project is divided into theoretical and experimental sections, consisting of detailed description of several successive steps of the experiment. The theoretical section describes the principle and function of laser, individual types of lasers and their classification, laser beam properties, laser cutting, etc. The practical part is focused on finding of a set of optimal cutting parameters, assessment of results of air supported laser cutting in terms of quality and accuracy of cutting surface. This part is followed by comparison of cutting surfaces with a conventional technology of laser cutting that uses oxygen and nitrogen. Final part of the project evaluates applicability of this unconventional technology from the economic point of view.
47

Navržení vhodných technologií výroby zadané ploché součásti z plechu / Suggestion of convenient technologies of production for submitted flat sheet metal part

Chaloupková, Lucie January 2011 (has links)
The project is elaborated in frame of engineering studies branch 2303T002. The project is submitting suggestion of convenient technologies of production for submitted flat sheet metal part 11 375. There are proposed a number of variants of production method, namely: production on sequence shearing tool, production by means of plasma machine, laser machines and machines for watejets cutting. Particular part is designed for the production quantity of 380 000 pieces per year. Based on the literary study of the shear and calculations, there were designed shearing tool for given part. For this tool the press CDCH 3000 P was selected (producer HESSE+CO Maschinenfabrik GmbH), with nominal force 3 000 kN. In the work there are included necessary calculations for all variants including technological and economical evaluation.
48

Souvislost vad řezu s řeznými parametry při laserovém řezání / Connection of mistakes cut with cutting characteristics at laser cutting

Šťastný, Jan January 2012 (has links)
The project in first part deals with theoretical analysis of technological possibilities of method of dividing materials with laser, principal and function of laser, division of different types of lasers, properties of laser ray, laser cutting, cut defects etc. Experimental part is focused on analysis of used machines and equipment, finding of optimal cutting parameters during laser cutting, evaluation of samples and then analysis of problem with generation of step changes and analysis of other possibilities for optimizing of the cut.
49

Analýza materiálu pro laserového řezání / Analisys of the material for laser cutting

Tonkovič, Miroslav January 2014 (has links)
This thesis deals with laser cutting of metal sheets from selected steel producers. The basics of laser technologies, especially in industrial use, are described in the introductory part. There the material requirements are described from the point of view of laser cutting. The comparison of materials from different steel producers is made from different angles in the practical part. The conclusion is dedicated to the evaluation of achieved results.
50

Optimalizace laserového tavného dělení povlakovaných hliníkových plechů / Optimization of laser fusion cutting of coated aluminum sheets

Pokorák, Milan January 2014 (has links)
The thesis primarily deals with the optimization of laser cutting center for coated aluminium sheet cutting and with the subsequent comparison of measured results and a sample made using waterjet cutting. The thesis is divided in two parts, the theoretical part followed by the practical one. The theoretical section is concerned with the unconventional technologies used, with their general analysis, design, history and utilization for industrial appliances. Main parts of this thesis deals with classification of particular cutting principles and their specific description. The theoretical part contains also classificaton of aluminium alloy, description of surface texture measurement and explanation of basics terms used for roughness measurement. The practical section is concerned with the particular task solution and with all knowledge used for optimization and evaluation of laser cutting. This part contains the measurement results, the measured material, the machines and devices used and also the technical and economical evaluation of this thesis content. The overall evaluation of the laser cutting optimization of specific component is mentioned in the experiment outcome evaluation article.

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