Thesis (M.S.)--Worcester Polytechnic Institute. / Keywords: Accessibility; CAM; CAD; Integration; Fixture Design. Includes bibliographical references (leaves 108-109).gh

Dissertation (Ph.D.) -- Worcester Polytechnic Institute. / Keywords: Computer aided manufacturing planning; Object-oriented systems analysis (OSA); Feature; manufacturing resource capability; setup planning; multi-part fixture Includes bibliographical references (p.146-154).

Thesis (M.S.)--Ohio University, November, 2003. / Title from PDF t.p. Includes bibliographical references (p. 112-115)

<p>This report was written as a result of a Bachelor Degree Project at the School of Technology and Society at University of Skövde spring 2007, together with Jede AB in Mariestad. The report covers the development of a door to a coffee vending machine that is under construction, and will in a chronological order describe the project from ideas to final product.</p><p>The project started with a rather extensive feasibility study that thru market research and user tests sorted out the opinions of potential customers, concerning today’s available assortment. Technical areas concerning materials and manufacturing methods were also scrutinized for the consideration of the possibilities of a future production.</p><p>The next step was to constructively generate ideas and thoughts that later on could grow to be potential solutions. After several weeks of hard work and pieces of good advice and recommendations from the assigner, four comprehensive concepts were built up. After a deliberation, the project group at Jede determined to proceed with one of the concepts.</p><p>This concept was modeled in the CAD program Pro Engineer, and was later on used to produce a full-scale model of the door. After having evaluated the prototype and making the door compatible with the components that were to be used, a satisfying result approached.</p><p>When the project was brought to its end, all material was handed over to the assigner, including a computer model that will be used to manufacture moulding forms. If everything goes as planned, the coffee vending machine will be available on the market during the beginning of 2008.</p><p>To sum up the project a discussion concerning the assignment and all its matters will be brought up in the end of this report.</p> / <p>Denna rapport har skrivits i samband med ett examensarbete i integrerad produktutveckling på designingenjörsprogrammet vid Högskolan i Skövde våren 2007, i samarbete med Jede AB i Mariestad. Rapporten behandlar framtagningen av en ny dörr till en kaffeautomat som konstrueras på företaget, och beskriver projektet i kronologisk ordning från idé till färdig produkt.</p><p>Projektet startade med relativt omfattande förstudie som utforskade vad företagets potentiella kunder tyckte om det sortiment som finns på marknaden idag. Även tekniska områden berörande material och tillverkningsmetoder granskades för att få klarhet i vilket utbud som möjliggjorde en framtida produktion av dörren.</p><p>Med en stadig grund att stå på inleddes idégenereringsfasen, vilken innebär att på ett konstruktivt sätt ta fram en mängd olika idéer att sedan arbeta vidare med. Efter att ha fått fingervisningar, råd och rekommendationer från företaget stod efter flera veckors arbete fyra koncept klara. Koncepten överlämnades till projektgruppen på Jede som efter överläggning valde ut ett koncept att gå vidare med.</p><p>Det slutgiltiga konceptet modellerades upp och bearbetades i CAD programmet Pro Engineer, vilket senare ledde till framtagning av en fullskalig prototyp. Efter att ha utvärderat prototypen och gjort dörren kompatibel med de komponenter som skulle ingå, närmades ett tillfredsställande resultat.</p><p>När projektet avslutades överlämnades material som var klart för verktygstillverkning, och om projektet fortskrider i planerad takt kommer automaten att finnas ute på marknaden under första kvartalet 2008.</p><p>Avslutningsvis diskuteras utvecklingsgruppens egna åsikter om projektupplägget och samarbetet med uppdragsgivaren, resultatet och tiden som följer efter projektets avslut.</p>

Techn. Universiẗat, Diss., 2002--Chemnitz.

Techn. Universiẗat, Diss., 2003--Darmstadt.

Techn. Universiẗat, Diss., 2004--Berlin.

As a part of Linköping University’s master program course curriculum, current thesis is performed at Tools and fixtures department (MPCT) of Scania, Oskarshamn. The aim of this master thesis project is to develop a complete construction of the station in CAD which calculates the weight and center of gravity of all the different cabs produced in Scania CV AB. To accomplish this project a generic product development process described in product development textbook by Ulrich and Eppinger (2012), fifth edition and The mechanical design by David G Ullman, fourth edition were extensively used. The whole function from a black box is decomposed into several sub functions and different solutions were identified for these individual functions. By using morphology matrix and proper combinations from these solutions five different concepts were developed and presented to Scania CV AB. The team along with technical design experts in the MPCT department evaluated all the concepts and one concept was chosen for further development. Protecting the weighing scales during loading of cab from forklift onto the station and safety for the cab during tilting are the two main challenges faced during detail design phase. We were able to achieve these operations by incorporating a lifting table into the station design. Thanks to the custom made multi-tasking lift table which is manufactured and supplied by HYMO. With the help of sensors, speed of the lifting table can be controlled with two operating speeds-High &amp; Low. Lifting table moves in its lowest speed whenever it approaches the weighing scales. Incorporation of Jacob safety into the lifting table allows the table to always operate in low speed when the lift link is in action. These sensors ensure high safety for the cab and weighing scales. Apart from this, an emergency stop has been provided to stop the entire operation in case of emergencies. In this proposed design, the center of gravity values will be determined in two stages and the weight readings are recorded in computer during these stages. For determining the longitudinal and transverse distances of CG, weight readings from all the weighing scales is essential once the cab is loaded on the station from the forklift. For determining the vertical distance of CG, two weight readings and measured tilt angle is required. A calculation module will allow the user to enter these values and obtain the result in no time. This developed 3-D CAD model with 2-D drawings are presented to Scania and the obtained results of this work fulfilled the set of requirements set for this master thesis.

Oral mucositis is an inflammation that affects the mucosa in the mouth. It often affects patients undergoing chemotherapy for cancer. The risk of inflammation can be reduced by cooling the mouth. In this project, ten different mouthpieces for cryotherapy of the oral cavity with air as cooling medium have been modeled in the SolidWorks. Flow simulations have been made on the different mouthpieces to investigate how the air is distributed in the models. The goal of the simulations is that the outflow of air should not differ more than 10 % between the largest and the smallest flow. With the results, the mouthpieces could be fine-tuned. Flow simulation on the ten prototypes gave varying results, some have a good distribution of air between the holes. Some, however, do not evenly spread the air and it flows much less air through certain holes. Three prototypes were printed in hard plastic at an early stage to see how they fit the mouth. At the end of the project, a total of seven models were printed by TADA medical's partner in a softer plastic. Several models then showed some points that need to be considered when designing nozzles. A handful of the models have been tested with the cooling device and the flow has been examined with a heating camera. The other prototypes have not been 3D-printed, so there is nothing about their convenience. To get better results, more advanced simulation requires the environment of the oral cavity with the exact dimensions.

Il est maintenant possible de fabriquer des structures treillis métalliques facilement avec la fabrication additive. Les structures en treillis peuvent être utilisées pour produire des pièces de faible masse et de haute résistance. Il n’existe pas de méthode de conception pour les structures treillis. Cette thèse se concentre sur les méthodes de conception des structures treillis et la manipulation dans le CAO et FAO pour faciliter l'intégration des structures treillis dans les produits. La thèse a abordé les questions de recherche suivantes:• Pourquoi les structures treillis sont-elles si peu utilisées dans la conception?• Quelles sont les informations nécessaires pour aider les concepteurs à concevoir des pièces contenant des structures treillis?• Comment les structures treillis peuvent-elles être créées rapidement et facilement dans le CAO?Les principales contributions sont les suivantes:• Une évaluation des outils CAO actuels dans la conception de structures en treillis en termes d'interface homme machine, de formats de fichiers CAO et de FAO pour la fabrication d'additive a été effectuée. Les résultats montrent que les outils de CAO et les formats de fichier CAO actuels ont des performances insuffisantes dans le contexte de la conception pour la fabrication d'additive. Les outils de CAO actuels créent et représentent actuellement des structures en treillis utilisant les surfaces limites des volumes. Cela contribue ainsi à la grande taille des fichiers, à une consommation élevée de mémoire vivre, ainsi des opérations fastidieuses pour les modélisations.• Une nouvelle stratégie de conception de structures treillis. Cette méthode sert de guide aux concepteurs pour l'intégration des structures en treillis dans les pièces fabriquées par fabrication additive en utilisant le matériau équivalent. Les concepteurs auront à leur disposition les informations nécessaires pour choisir les types et la densité des structure treillis à utiliser.• Une méthodologie pour calculer les propriétés matériau équivalent. Ces matériaux équivalents remplacent le besoin de créer des structures treillis dans le CAO et de les calculer par éléments-finis. Cela permettra d'économiser du temps dans la création de modèles CAO 3D et les calculs éléments finis.• Les principales caractéristiques géométriques des structures treillis ont été déterminées. Un modèle squelettique a été présenté pour définir les structures treillis à partir de points, de lignes, de sections et de joints au lieu des surfaces et des volumes. Une méthode est présentée pour visualiser et découper les structures treillis à partir du modèle squelette. / It is now possible to manufacture metallic lattice structures easily with additive manufacturing. Lattice structures can be used to produce high strength low mass parts. However, it does not exist a method to design lattice structures for additive manufacturing. This PhD focuses on lattice structure design methods and manipulation in CAD, CAE and CAM tools to facilitate the wide use of lattice structures in products. The thesis addressed the following research questions:• Why are lattice structures so little used in part designs?• What are the information necessary to help designers to design parts containing lattice structures?• How can lattice structures be created quickly and easily in CAD?The main contributions are:• An evaluation of current CAD tools in terms of human machine interface, CAD file formats, CAE and CAM to design lattice structures was conducted. The results show that current CAD tools and CAD file formats have insufficient performance in the context of design for additive manufacturing. Current CAD tools create and represent lattice structures using surfaces and volumes. This contributes to large file sizes, high RAM consumption, as well as time-consuming creations and operations.• A new lattice structure design strategy. This method serves as a guideline for designers to integrate lattice structures in additive manufactured parts using the concept of equivalent material. Designers will be able to choose lattice structure patterns and densities.• A methodology to create equivalent materials is presented. It is solid and does not contain any struts, thus has few surfaces only. With this equivalent material, it will be easier and quicker to conduct FEA due to the small number of surfaces involved. The characteristics of different lattice structure patterns and densities were determined, which are the relative Young’s modulus and relative strength in function of the relative density. This methodology can be applied to all lattice structures.• The main lattice structure geometrical characteristics were determined. A skeleton model was presented to define lattice structures with points, lines, sections and joints instead of surfaces and volumes. A method is presented to visualise in CAD and slice lattice structures in CAM from the skeleton model.