Reducera variation vid omställning genom standardiserat arbete

Sammanfattning: Volvo Cars in Skövde aims to reduce their waste in their crankshaft-line where they produce two types of crankshafts, type 2, and type 7. The intention with this work is to schedule the total changeover of the production line to identify potential actions that could reduce the changeover time and its variation. In the current state 7 operators are being used to carry out the changeover. One of the tasks that were handed out from Volvo was to examine how many operators that are required to carry out the changeover without any loses from waiting for operators. A time-study has been done which provides a clear overview of how the changeover is done right now, observations of the production line and interviews of the operators were also made. From this data a map was created of how the changeover should be done in theory, both for the workflow and for the operators. The result of the methods showed that it is a big variation between the changeover-times, this is due to that there are no work instructions for the operators and thereby no standardized work procedure. From the mapping the number of operators that are needed to carry out a changeover has been calculated and determined. The sequence in which all elements are to be performed and how they are to be prioritized was also obtained from the theoretical changeover. This then formed the basis of which the instructions for the operators were created upon and became the standardized work that was implemented. The theoret-ical changeover also showed that it is possible to carry out the changeover with only two operators. The instructions were also tested in practice with a result that showed that it can be done and even reduce the changeover-time, but further work is required to verify the working method. To verify that the new way of working reduces the variation more measurements need to be done but with the in-structions the variation should be reduced. To further improve the changeover, a theoretical timeline was made of how the changeover would be made with three improvement proposals implemented. The results from them showed that if introduced, they would reduce the changeover time by 61%.