Ett visionbaserat koncept för ökad kvalitet ut till kund
Sammanfattning: ABSTRACT Purpose: The purpose of the study is to investigate what aspects to observe when introducing a concept for inspection of critical surfaces, product traceability and future automation in an industrial production line. To attain a clearer structure in the study, the purpose has been divided into three sub-questions from which the authors have analysed the area of subject. § What traceability aspects are important to consider when introducing the concept? § How can the concept induce a better quality to the internal and external customer? § What aspects are important to consider when implementing the concept in a production line? Methodology: To realise the purpose of the study, the authors have conducted a case study at a large manufacturing company within the automotive industry. Supporting the reasoning towards satisfying the purpose, a literature study has been performed within the subject areas quality, traceability and vision systems. An external analysis has also been conducted at two companies active within the area of industrial vision systems. The data collection is built on a combination of observations, interviews and existing documents. The collected data from the company in the case study, the external analysis and the literature study has been put through a qualitative analysis with the goal of fulfilling the purpose of the study. Findings: The study shows that the traditional manual quality controls consist of many flaws, resulting in delivering defect products to the customer. This statement is based on the fact that the case company regularly overlooked defect products in their final quality control. A large portion of all defects recorded at the case company were casting related defects, which possibly could be discovered with the help of a vision system. The literature states that vision based solutions is the obvious alternative to the manual quality control and therefore the study focused on classical 2D-based vision solutions. Traceability is a conception that is strongly related to quality and is an important part of total quality management. When defect products are discovered later in the value chain their traceability becomes equally important. The study indicated that the case company couldn’t trace individual products, resulting in the need to base the search of further defects on qualified hunches based on cycle times and the daily management of the production line. Implications: Based on the sub-questions formulated from the main purpose, the goal of the study was satisfied. The case study, the external analysis and the literature study laid the foundation of identifying the sought-out aspects. The following aspects are to be considered: § Investigate the concepts ability to detect specific defects. § Evaluate the optimal lighting of the critical surfaces when photographing the products. § Adapt the image follow-up to the company’s conditions to make it manageable. § Solutions must not induce new bottlenecks in the production line. § Solutions should be placed as early as possible in the value chain. § Dirt and fluids should be removed before photographing the critical surfaces. § A process to handle rejected items should be developed. § Affected personnel should receive education about the concept. Recommendations: Based on the drawbacks of 2D vision identified in the study the authors believe that further research should focus on how the difficulties of 3D scans can be overcome so the benefits can be used for industrial purposes in the future. Keywords: Vision system, quality management and traceability.
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