The CMM Measurement Path Planning for Blade Surface Based on the Contour Measurement

In order to calculate blade sectional parameters and errors, the blades are often measured with the contour measurement. According to the requirements of the contour measurement that measuring points of airfoil section must be on the plane of constant height, an approach for the measurement path planning is proposed. Firstly, the blade surface model was reconstructed based on CMM measurement data, then measurement path planning for airfoil section was done through it. The principle and process of path planning is given. The calculation formulas of the measuring points of blade sectional Line are summarized, and the distribution density of measuring points is determined with curvature. Blade sectional Line based on measuring points and equidistant surface are researched.