Shape error evaluation method of free-form surfaces
Local and global evaluation methods for shape errors of free-form surfaces are presented. The local evaluation methods use the changes of principal curvatures between the original CAD data and actual surfaces. The global evaluation methods use the aggregate normal vectors for the characterization of portions of surfaces. Both methods are applied for the evaluation of sheet metal formed by using numerical simulation data and coordinate measurement data.
change of principal curvatures aggregate normal vectors shape error evaluation of free-form surfaces