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Montöranpassad materialförsörjning: En fallstudie på Scanias växellådsmontering i Södertälje
2014 (Swedish)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

An increased amount of product variants in the automotive industry have made it harder to stock all necessary items along the assembly line. This has created a need for sequenced material supply in order to free up space, particularly when new articles are introduced. Operators at an assembly line are directly affected by a change of material supply method, but few of the previous studies within the area have taken their perspectives into primary account. With respect to this background, the purpose of this study is to create a model that can be used as decision basis regarding which group of articles, from an assembly operator’s perspective, is most beneficial to deliver to the line in sequence. The model should only be used when new articles are introduced, and there is a need to free up space along the assembly lineIn order to fulfil the purpose of the study the following three research questions were established; what parameters should be part of the evaluation regarding which articles that are most beneficial for the assembly operator to get delivered in sequence, how can these parameters be weighted and how can the model be created in order to make sure that it is both user-friendly and reliable. To be able to build this model a case study was conducted at the department for gearbox assembling at Scania in Södertälje. The user interacts with the model through an electronic survey, implemented in Excel and Visual Basic. The model then generates a ranked list of which group of articles that is most preferable, for the assembly operator, to get delivered in sequence. Since space reduction along the assembly line is a critical aspect, the model will also show how much space is freed up when each respective group of articles is sequenced. Since the input to the model is based solely on the assembly operator's opinions, the actual decision of which group of articles to sequence should also take into consideration the opinions of the logistics department. The decision should be one that satisfies all parties.The model is based on the following five parameters; time to pick an article, handling time of packaging, the assembly operator’s walking time, the assembly operator’s ergonomics and quality control. The collection of actual measured data is then combined with each parameter’s given weight, which is based on how critical it is to improve that specific parameter, for example how important it is to reduce the operator’s time to pick material. Two evaluation methods were tested, Analytic Hierarcic Process (AHP) and Constant Sum Scaling (CSS), and the latter turned out to be more advantageuous for the evaluation made in this study. The developed model has great potential to be beneficial also for other manufacturing companies that face similar challenges as the company in this case study. However, this has not yet been tested but it is indeed an interesting topic for future studies. 

Place, publisher, year, edition, pages
Keyword [en]
Keyword [sv]
URN: urn:nbn:se:ltu:diva-50592Local ID: 7d36de19-83d3-4b0c-bb0d-f32818545355OAI: diva2:1023953
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Subject / course
Student thesis, at least 30 credits
Educational program
Industrial and Management Engineering, master's level
Validerat; 20140628 (global_studentproject_submitter)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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Engström, CharlottaOlsson, Anna

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