It was analyzed for serious blade deformation caused by heavy stress in investment casting large-sized K435 gas tubine blade

and defects such as porosity

shinkage cavity and inclusion in solidification process.The deformation rate of casting profile was decreased through sectional wax mold calibration and sectional anti-deformation compensation of wax pattern.The gating system could realize sequentially solidified by wrapping aluminium silicate fiber to solve corresponding porosity at the junction between platform and airfoil and micro-porosity.The shell obsolescence

casting run-out and sand inclusion caused by sand loss could be avoided at deep socket of tenon by improving blade structure and shell making process.The waste rate of fluorescent slag inclusion of the casting can be reduced by improving wax assembling system and casting process parameters.These measures above can improve greatly acceptance rate of the blade.