A DMAIC based framework to conduct Measurement System Analysis : A case study at Northvolt AB

Sammanfattning: The aim of the project was to develop a framework for the execution of a Measurement System Analysis (MSA) which would help determine capability of a measurement system. The strategy behind carrying out this thesis has been to draft a framework which is based on the Define, Measure, Analyze, Improve, Control (DMAIC) model for a Measurement System Analysis (MSA) which would enable to gain a better understanding of the capability of measurement instruments that are used to control the quality of production processes of lithium-ion batteries. The framework helps users carry out controlled experiments that help determine parameters such as bias, linearity, stability, and robustness for the accuracy determination and repeatability and reproducibility to help determine precision. To put the framework in practice, a case study was undertaken on the image measurement system in the quality control laboratory. Once the capability of the measurement system is understood, it is accepted or rejected based on the acceptance criteria defined in this thesis. In this case study, the current state of the measurement system was not acceptable to control the production process as there was high variability in the measurement results. This was overcome with the implementation of an automated measurement program that reduced measurement variability. The final phase of the framework is responsible for ensuring that the improvements made to the system are controlled over a long period of time. Therefore, control charts are used to continuously track the measurement system performance and notify users about trends and outliers.