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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

Utveckling av bearbetningsmaskin för rullkedjor / Development of a machine for customizing roller chains

Dickèr, Jonathan, Jonker, Marjo January 2015 (has links)
Det här projektet handlar om att förbättra en existerande maskin som är till för att bearbeta rullkedjor utefter enskilda order. Den nuvarande maskinen är tillverkad och används av det svenska transmissionsföretaget Jens S Transmissioner, men den anses inte leva upp till de krav som ställs och behöver därför konstrueras om. Operatören kräver en ny maskin som främjar en bättre arbetshållning och arbetsflöde samt ger en säkrare arbetsmiljö. Målet är att ta fram ett konstruktionsunderlag åt företaget för tillverkning av en maskin som lever upp till de krav och önskemål som företaget ställt. Författarna kommer alltså inte själva tillverka maskinen och externa komponenter så som kraftgivare kommer köpas in från underleverantörer. Den nuvarande maskinen observerades och diskuterades med maskinoperatören för att skapa en tydlig bild av de problem som upplevdes i dagsläget. Utifrån problemen upprättades fem frågeställningar som blev vägledande genom hela projektet. Frågeställningarna besvarades genom att generera idéer och utifrån dem skapa tre olika koncept som alla löste problemen men hade sina tydliga skiljaktigheter. Genom att applicera olika produktutvecklingsprocesser och använda verktyg som exempelvis 3D-dimensionering och FEM-analys kunde tydliga koncept skapas och förbättras. Efter att ha valt ut ett koncept samt utvecklat det ytterligare resulterade arbetet i en maskin som lyckades lösa problemen på ett kostnadseffektivt och smidigt sätt. Förbättringen av operatörens arbetsställning ger honom en markant bättre ergonomisk upplevelse. Skyddet som agerar med en halvautomatisk funktion kommer skapa en säkrare arbetsmiljö och de smarta delfunktionerna låter operatören utföra arbetet på ett bekvämt och effektivt sätt. Att självständigt leda ett projekt har varit en lärorik erfarenhet. Båda författarna har haft olika kvalitéer som har varit till stor hjälp för att driva projektet framåt. Det har skett gott samarbete sinsemellan genom hela processens gång, trots de problem som uppstått längs vägen. Vidare upplever båda författarna att projektet har bidragit till ökad känsla och självförtroende inför yrkesrollen som ingenjör och känner sig nöjda att med detta projekt få knyta ihop säcken. / This project is about developing an existing machine that customizes roller chains. The old machine is manufactured and used by the Swedish transmission company Jens S Transmissioner. However, it turns out to be inadequate in many aspects, such as its safety guard and ergonomics. The aim of this thesis is to help Jens S to retrieve a new manufacturing plan for a machine that satisfies the operators and companies demands. The authors will not build the machine and more advanced machine parts such as power sources will be purchased from subcontractors. In order to achieve a clear image of what problems had to be solved the machine was carefully observed and issues were discussed with the operator. Out of these discussions five questions were formulated which act as guidelines throughout the project. Each question were attempted to be answered by creating a number of ideas that were conceived by using various idea generating methods. Three different possible concepts, which differed in level of complexity, were achieved using a morphological matrix. By applying different mechanical design processes and using tools such as FEA- studies and Computer Aided Design the construction and its different parts were developed and improved. After choosing one of the concepts and improve it even more the project resulted in a machine construction that managed to fulfill the problems and give improved work ergonomics and efficiency for the operator. Since the project was lead independently it successfully gave an increased feeling and understanding of mechanical engineering and product development. There has been a continuous effective co-operation during the whole process where both parts contributed with their own specific skills. However, various obstacles showed up. These obstacles have implied new insights such as many good ideas comes from developing other, and thus problems should be considered as an encouragement for improvement rather than a discouragement.
2

Beräkningsprogram för transportbanor / Calculation program for conveyors

Jordansson, Hannah January 2016 (has links)
This project has been implemented as a degree of Bachelor of Science education in Mechanical Engineering at the University of Karlstad during the spring of 2016. The work has been carried out by Hannah Jordansson, a student at the Faculty of Health, Nature and Technology science. The main task of the project was to develop a calculation program in Excel for industrial conveyors for the company ÅF Industry. ÅF Industry requested a calculation program to use as a tool when building the conveyors. The conveyors consist of two different types, one rolling conveyor and one chain conveyor. The two types will be developed separately in the calculation program. The goal with the work was to build a program that will give the user the right outputs from certain inputs. The desired outputs from ÅF Industry for both conveyors was the deflection of the trolley tracks, if needed a cross beam and also information about the required drive. During the development of functional calculation program the work began with preparing all the equations needed. The equations were then put together and evaluated. When all of the equations were approved they were put in and performed in Excel. The calculation program is completed, tested and evaluated. The program has been formed to a layout that meet ÅF Industry’s requests.

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