Ceramic core is used to form the cooling channel of hollow turbine blade in investment casting process. The bending and torsion deformations of ceramic core have direct influence on the wall thickness dimension accuracy of turbine blade. To study bending and torsion deformation of ceramic core generating in manufacturing process

firstly

based on the definition of bending and torsion deformations for airfoil and the structure characteristics of ceramic core

the algorithms for computing bending and torsion deformations of ceramic core are studied

including contour-based methods: Snake-model

spline-fitting method and point-based methods: Convex-hull

2D-registration

distance-weight method. Secondly

through computing a simulated known bending and twist deformation

these five methods are compared. The comparing results indicate that the accuracy and stability of spline-fitting method is better than other methods.