In order to improve the qualification rate of gas turbine hollow turbine blades

non-destructive testing technologies such as X-ray computed tomography (CT)

three-dimensional scanning (3D) and ultrasound were used to carry out dimensional measurement of turbine blades in key stages of investment casting

and the whole process of ceramic core

wax mold

mold shell and blade castings was realized. The results show that the CT technology can meet the measurement accuracy requirements of ceramic core and wax mold

and is further applied to the measurement of mold shell size. In addition

the dimensional accuracy of ceramic core

wax mold and mold shell

inner cavity and wall thickness can be detected and evaluated by using CT. The dimensional measurement method of the whole process of hollow turbine blade preparation established in this study provides strong data support for ensuring the preparation of hollow turbine blades and improving the qualified rate of large-size hollow turbine blade precision casting products.