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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.
1

UMA METODOLOGIA PARA IMPLEMENTAÇÃO DE TECNOLOGIA CNC EM MÁQUINAS SECCIONADORAS / A METHODOLOGY FOR THE IMPLEMENTATION OF CNC TECHNOLOGY IN SECTIONING MACHINES

Santos, Jeferson Rafael Rodrigues dos 22 December 2011 (has links)
This work consists in proposing a methodology for the conversion of conventional sectioning machines in CNC equipments. The study is directed to the furniture industry and considers the possibility to outfit this kind of equipment with two programmable motion axes, through the utilization of devices as linear guides activated by engines with positioning accuracy. The system specifies one of the axes for motion and positioning of the plate to be counted, according to the dimensions of the project and other axis for the displacement of the limit sensor of the cutting tool. The technique consists in generating automatically the CNC programs for the adapted machine with data coming from systems of cutting plans generation. This work shows how to implement this technique through CAD application and considers two possibilities of obtaining the Cutting Plan data. On the first case, the sequence of cutting, defined with specialized computer programs, is converted in a drawing on CAD, that after is processed for the generation of the CNC program to the machine. The other alternative is to consider the possibility to implement techniques dedicated to the definition of the cutting arrangement, through CAD routines. In this case, a manual method was purposed with the goal to demonstrate the technique that assumes that the furniture project is virtually defined on CAD through 3D drawing resources. To demonstrate the validity of the methodology were elaborated two virtual projects a kitchen and a bedroom for which were generating the cutting plans with different techniques and their CNC programs. This study shows that the number of patterns produced for cutting planes through the proposed empirical method for a software used is the same. However, note that there is a difference in the occupied area, comparing the use of sheet parts in the software and the empirical method, it would not be feasible due to the sum of surpluses generated a longer period of production. / Este trabalho consiste em propor uma metodologia para conversão de máquinas seccionadoras convencionais em equipamentos CNC. O estudo é direcionado à indústria moveleira e considera a possibilidade de equipar esse tipo de equipamento com dois eixos de movimentação programáveis, através da utilização de dispositivos como guias lineares acionadas por motores com precisão de posicionamento. O sistema especifica um dos eixos para movimentação e posicionamento da chapa a ser cortada, conforme dimensões de projeto e outro eixo para deslocamento do sensor de fim de curso da ferramenta de corte. A técnica consiste em gerar automaticamente os programas CNC para a máquina adaptada a partir de dados provenientes de sistemas de geração de planos de corte. O trabalho mostra como implementar essa técnica através de aplicativos CAD e considera duas possibilidades de obtenção dos dados do Plano de Corte. No primeiro caso, a sequência de corte, definida em programas computacionais especializados, é convertida em um desenho do CAD, que posteriormente é processado para a geração do programa CNC para a máquina. A outra alternativa é considerar a possibilidade de implementação de técnicas dedicadas à definição do arranjo do corte, através de rotinas do CAD. Nesse caso, um método empírico foi proposto com o objetivo de demonstrar a técnica, que parte do princípio de que o projeto do móvel esteja virtualmente definido no CAD através de recursos 3D de desenho. Para demonstrar a validade da metodologia, foram elaborados dois projetos virtuais uma cozinha e um quarto para os quais foram gerados os planos de corte por diferentes técnicas e os respectivos programas CNC. O estudo realizado mostra que a quantidade de arranjos gerados para planos de corte através do método empírico proposto em relação a um software utilizado é a mesma. Além disso, nota-se que existe uma diferença de área ocupada, comparando-se o aproveitamento das peças na chapa no software e no método empírico, o mesmo não seria viável devido ao somatório de sobras geradas num período maior de produção.
2

ReDesign och Upcycling : från textilavfall till nytt plagg / ReDesign and Upcycling : from textile waste to a new garment

Englund, Nathalie January 2021 (has links)
Att återanvända textilavfall, till exempel plagg från textilföretag, innebär att det bara finns en begränsad mängd av varje materialresurs. Det behövs då tas fram en metod för att tillverka nya produkter med plagg som materialresurs. Denna studie forskar i om återtillverkning av plagg är möjligt att lägga i produktion där hållbarhetsaspekten ligger i fokus. Med grund i tidigare studier gjordes en tabell av avfallshierarki och återtillverkning. Idag finns verksamheter som arbetar med återtillverkning men då är det vanligtvis gjort på̊ tyg i metervara eller där man adderar nyproducerat material till begagnade plagg. Hittills har få studier genomförts av återtillverkning i produktion med plagg som materialresurs. Denna studie håller sig till att inte använda annat nyproducerat material än sytråd. Borås energi och miljö bidrog till denna studie med fleecetröjor som annars skulle kasserats. Sedan gjordes materialberäkning på fleecetröjorna för att genomföra materialoptimering av en bestämd produkt för nämnda plagg. Det gjordes en kort prototypframtagning tillräcklig för denna studie. I studien användes tröjorna för att framställa nya produkter. Projektet analyseras för att se om det är möjligt att lägga detta i produktion. Slutsatsen visar att metoden är repeterbar och kan utvecklas som presenteras i vidare forskning. / Reusing textile waste, such as garments from textile companies, means that there is only a limited amount of each material resource. A method is then needed to manufacture new products using garments as a material resource. This study researches whether the remanufacturing of garments is possible to put into production where the sustainability aspect is in focus. Based on previous studies, a table of waste hierarchy and remanufacturing was made. Today there are businesses that work with remanufacturing, but then it is usually made from fabric in metered material or where newly produced material is added to used garments. This study is not used by newly produced material other than sewing thread. Borås energi och miljö contributed to this study with fleece sweaters that would otherwise have been discarded. Then material calculation was made on the fleece shirts to carry out material optimization of a specific product for said garments. A short prototype production was sufficient for this study. In the study, the sweaters were used to produce new products. The project is analysed to see if it is possible to put this into production. The conclusion shows that the method is repeatable and can be developed as presented in further research.

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