Due to the specific requirements for monitoring processes and products in the aircraft industry, non-destructive testing (NDT) is increasingly used in combination with advanced statistical analysis.The paper presents the results of research aimed at determining the quality of wax models and multi-layered ceramic forms, used for precise casting of critical parts of aircraft engines. Studies on the shape and dimensions of wax models and ceramic moulds were made by 3D scanning using the GOM ATOS CORE 200 scanner. A map of dimensional deviations, created as a result of comparison of scanned wax models with CAD models, was created. The thickness of the moulds was determined by comparing the dimensions obtained by scanning 3D wax models and ceramic forms.The obtained measurements were then subjected to advanced statistical processing using selected Six Sigma tools. The analysis was carried out in several separate areas of both wax models and forms. The basis of the analysis were the results of measuring 30 points in each of the measurement zones of the blades and moulds models. The consistency of the results with the normal distribution based on the empirical cumulative distributor was verified. The Anderson-Darling test was adopted based on the weighted distance between empirical and theoretical counselor.Keywords: Six Sigma, Investment Casting, Statistics, 3D Scanning
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