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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

Prototyp av växelspaksknopp CMG3 / Prototype of a gear knob CMG3

Corselli, Rebecca, Al-Shawi, Sajjad January 2016 (has links)
This study has taken place in Mullsjö at Kongsberg Automotive (KA). The purpose of the study was to evaluate how to construct an easy mountable gearknob to the lowest cost based on design and functionality by using the techniques of concept generation and sifting. The knob is intended to be integrated in a Shift-ByWire shifter and generate prototypes through SLS. Researchers followed a concept study methodology following an abductive approach, to generate an appropriate mechanical design for the gearknob. Concepts were formed by a brainstorming process, followed by weighing criteria for the knob and were finalised by evaluating the formed concepts using a Pughs Matrix constructed by the researches. Relevant literature of mechanical designs processes was reviewed to develop the theoretical framework. In addition, data was collected from Kongsberg´s computer system and unstructured interviews with employees within certain specific areas to gain additional understanding. In cooperation with supervisors, pros and cons analysis of cost, functionality and mounting capability were used to enable the researchers to draw recommendations for mechanical designs meeting the requirements of specification. The study resulted in several findings in relation to each research question. In general, a gear knob has been constructed using SLS that can be both used for mounting and demounting purposes. In addition, this construction met the specification of requirements by KA. The Printed Circuit Board (PCB) were constructed using the geometrics in the inherent components of the knob. The study further resulted in a leather gaiter that were constructed as a link between the dashboard and the knob. Results from this study imply that more screws would be used for mounting different components in the prototype phase, which will impact the view on criteria for forthcoming knobs and their mounting methods. In addition, data collection have also shown that snaps in chromium details easily break, which can also further question the use of chromium snaps for dismantling purposes. Finalised recommendations for the gearknob met the requirements of specification since researchers constructed the most simple mounting on the current surface design. Researchers conclude that these concepts are applicable and could be presented in a following prototype phase. However, if the knob is to be produced, researchers do not have enough support regarding the liquid injection moulding, which requires to be further considered. Materials will require the design constructed in this study to be modified. / Arbetet har skett i Mullsjö på Kongsberg Automotive (KA). Syftet med studien var att konstruera en lättmonterad växelspaksknopp till lägsta kostnad utifrån design och funktionalitet. Detta baserat på konceptgenerering och sållningstekniker. Knoppen kommer att integreras i en Shift-by-Wire växelspak och tillverkas i SLS prototyper. Arbetet är en konceptstudie som har följt en abduktiv ansats. Tidigare konstruktionslösningar har studerats för att få kunskap om hur en knopp utformas. Koncepten har genererats via brainstorming och har följts upp av parvis viktning. Koncepten har sedan sållats med hjälp av Pughs matris. Relevant litteratur inom produktutvecklingsprocesser samt intervjuer med anställda har gett grunden till det teoretiska ramverket. Handledare har givit sin input under hela arbetsprocessen för att hjälpa studenterna att välja rätt koncept utifrån monterbarhet, funktionalitet och pris. Studien har svarat på de tre frågeställningarna som utformats. En knopp i SLS har konstruerats utifrån enkel montering och demontering som möter företagets kravspecifikation. Kretskorten inuti knoppen har formats utefter de ingående delarnas geometrier. Vidare har övergången mellan knopp och centerkonsol resulterat i en läderdamask. Studiens resultat kan få konsekvenser i att mer skruv kommer att användas i prototypfasen vid framtida projekt. Detta kan komma att ändra synen på hur viktigt monterbarheten kan vara i kommande knoppar. Informationsinsamling har också visat att snäppen i kromdetaljer lätt går av och detta kan ifrågasätta användningen av dessa. Vid materialval rekommenderas det att se över konstruktionslösningarna då de uppnådda egenskaperna kan avvika. Arbetet har utformat konstruktionen så att det fungerar bra för SLS prototyper men studenterna kan inte garantera att dessa fungerar om komponenterna ska formsprutas.

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