As the trial and error method and the numerical simulation method have difficulty in accurately reflecting the deformation of the hollow turbine blade in the process of investment casting

a comprehensive compensation method of the reverse deformation based on the measuring result was prompted. Firstly

through inspection by three coordinates measuring machine (CMM) and statistical analysis of the investment blade sample

three kinds of deformation including shrinkage

torsion and bending of the blade body section were calculated

then a comprehensive compensation algorithm for the design of blade mold cavity based on the reverse deformation was established

in order to achieve optimization design of the investment cavity. Taking the tip section of the investment blade sample for example

the profile error of the blade body

the maximum error of leading edge

the maximum error of trailing edge decreased by 50%

68%

31%

compared with the uncompensated method. Finally the experiment results show that the method can effectively improve the forming precision

and precisely controll the shape of the hollow turbine blade.