Analys av kapacitetpotential och produktionslayout i robotcell : Examensarbete utfört på Swepart Transmission AB

Sammanfattning: This thesis is done at Swepart transmission AB in Liatorp. Swepart is a manufacturing company of transmission solutions. As customer demands and production volumes increase, it results in higher requirements on the production. The main purpose with this thesis has been to improve the Overall Equipment Effectiveness (OEE) and the profitability in one of the company’s robot cells, with an associated lathe. The study is limited to the three most common articles that is produced in Cell 1: 433, 401 and 296. The research questions purpose is to identify the potential of the capacity in the cell, but also to analyse the actions that can be done to improve the capacity. To be able to answer the research questions, observations of the production has been made and collected data from Axxos has been used. The production layout has carefully been studied to find out which factors that affect the utilization in the cell. With this collected data the OEE-index has been calculated, for the whole cell as well as for each article. Time analyses have also been made over the robots and the machines cycle times, in order to see what time losses that occur in the cell. The result in the study shows that the biggest capacity losses are related to the performance for two of the articles. Though the timeline for the last article shows that the cycle time can be decreased, just by increasing the production rate of the milling. There are also a lot of big losses in the availability that can be improved. One of the bigger losses is the lack of staff. Another important part to consider is routines with the lathe. The company have to work with the lathe by the theory of constraint, which means that the lathe always must be available and producing. An important but simple action is to increase the production rate in the article 433. This would imply that the possible run time of the lathe would increase, but also for the whole cell due to the lathe is a bottleneck. Another important action is to overhaul the way they work with OEE in Axxos, as they according to their current work is hiding big and important losses in the production. It is also important to make sure that the stops and cycle time of the lathe is registered in Axxos. Since the lathe is a bottleneck is it the most important machine to keep track of. The study has shown that there is a big potential of the capacity in the cell, but that it is mostly limited by the lathe’s slow production rate. Therefore, it is important to process the lathe as a bottleneck and eliminate the factors that decreases the lathe’s possible production time.