Utformning av produktionssystem och försörjningskedjan för tillverkning av mätinstrument

Abstract

This thesis aims to optimize the production at RanLOS AB and help them move from building one prototype at a time to producing in larger series. The goal is to create a cost effective, quality ensured and scalable production that focuses on reducing waste and ensuring a good material flow. The work is limited to the production side and logistics only, design and product development are not included in this project. The research questions addressed are how bottlenecks can be avoided by optimizing the flow of materials in production, and what safety stock levels are needed to reduce risk of longer lead times. A literature review was conducted to build knowledge in lean philosophy, value stream mapping, systematic layout planning (SLP) and safety stock. The value stream mapping was used to document the current production and identify areas for improvement. SLP helped plan where workstations should be placed, based on their relationship and material flow. The type of layout was discussed based on product volume and the variety of RanLOS products, comparing job shop, project line and cell layouts. A safety stock estimate was developed through calculations and reasonableness assessment done together with RanLOS. Observations and interviews with assembly workers and production managers were conducted throughout the project to collect data from the existing production. A simulation model was made in Siemens Plant Simulation after all mapping and data collection was completed. It recreated how the real system would work in the new layout. Several experiments were run on the digital model to evaluate the optimized flow