As a part of the Master of Science in product- and process development at Mälardalens University, this thesis is performed during the spring semester of 2015. The employer is Strängbetong AB winner of Lean-builders 2013 for their innovative production system in the traditional construction industry. The thesis is performed on Strängbetong factory in Kungsör and delimited to the reinforcing workshop, which is the first step of producing concrete pillars. These issues are the goals of which this thesis is to answer:
Which are the most important factors that affect the production for the reinforcement work shop at Strängbetong AB in Kungsör the most and makes it possible for the waste to grow?
How does a company achieve a better production management for a more predictable manufacturing?
A description was made of the current state by mapping the manufacturing processes of reinforced cages with help of observations and literature studies. A value stream map was made to analyze the processes, which affects the productions outcome the most. The authors used an efficiency analysis of one of the main processes. To ensure that they had the right amount of input the process was observed for five days, in which they timed the process to get substantial data of unplanned stops and cycle times.
It was discovered that one of the main elements that affected the production was the failure rate of the drawings used to produce reinforcement cages. With input from the factory audit department the authors could calculate 17 % of all drawings needed correction. When a drawing is incomplete it can keep the production waiting in an unpredictable amount of time, until the necessary changes have been made by the constructor to correct the errors. Some of the other elements that where discovered was unnecessary transport, capacity-constrained workstations and the workshops layout.
The improvement proposals that were developed was to optimize processes through the development of a new assembly station, a new layout, strive to complete fewer orders rather than several.
With these improvement suggestions and recommendation for Strängbetong to strive towards an optimized material flow throughout the factory, the company can achieve an improved flow and get better control over their production.
2015. , 82 p.