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2012 (Swedish)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis

Abstract [en] : This master thesis has been carried out at Ferruform AB, which is a wholly owned subsidiary of Scania AB. Ferruform produces rear axle housings, cross members, side members and bumpers for trucks and busses. Ferruform is constantly working to improve their production and a part of these improvements are to raise the internal quality and thus reduce waste. A problem that exists today is to ensure the quality of the rear axles manufactured in the manual welding line. The purpose of this work was to identify the root causes of these problems and find solutions to eliminate them. The work would also introduce and evaluate a methodology for problem solving. The problem solving methodology used in this work is called 8-stegsmodellen. This methodology is in use at Scania, but was at the time of this work not introduced at Ferruform. The work was limited to examining the problem of the reinforcement plates that are welded on the manual welding line. Data and information was gathered through interviews, observations, and internal quality reports. Based on the completed analysis, the study shows that the problems with the placement of the reinforcement plates have three root causes: • Ferruforms collaboration with the design department in Södertälje has not been good enough in the product development process. • Positioning accuracy of the spring brackets are not sufficient enough, for both the physical location and the requirement by drawing. • The working methods for the manual work are not guaranteed in terms of quality. Based on the defined problems a proposal of solutions where created to eliminate the problems. The final chosen solution means that the design of the reinforcement plates is changed and a reference track is created on the plate. This reference track allows Ferruform to both fixture and control the placement of the plate against the current drawing requirements. Further work should be done to improve and enhance the cooperation between Ferruform, as a production unit, and the design department in Södertälje. This should be done early in the product development process to ensure possibility for robust and productive fixation and the ability to control the outcome of the placement of the details.

Place, publisher, year, edition, pages: 2012. , 91 p.

Keyword [en] : Technology

Keyword [sv] : Teknik

Identifiers: URN: urn:nbn:se:ltu:diva-50419Local ID: 7b05c5b4-9678-4d76-a05b-5e0a73913767OAI: oai:DiVA.org:ltu-50419DiVA: diva2:1023778

Subject / course: Student thesis, at least 30 credits

Educational program: Mechanical Engineering, master's level

Supervisors : Sundvall, PetrusKarlsson, Micael

Examiners : Engström, Hans

Note: Validerat; 20120611 (anonymous)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved



Autor: Metsävainio, Erik

Fuente: http://ltu.diva-portal.org/







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