METHOD OF STRAIGHTENING LARGE-SIZE BLADES OF GAS TURBINE ENGINE Russian patent published in 2024 - IPC B21D3/16 B23P6/00 F01D5/14 

FIELD: machine building.

SUBSTANCE: invention relates to machine building and can be used for reconstruction of the aerofoil profile of large-size fan blades after flight operation at detection of bends of the input and output edges of the blades. Blade is installed in the basing detachable rod along the z axis of the blade, containing contact surfaces in the form of a shank profile, a back and a trough of the blade, the surfaces of the input and output edges of the blade aerofoil profile are lubricated, simultaneously the basing rod with the blade is heated, blade is heated to temperature lower than that of heat treatment; at that, blades and rod are made of identical material. Then, the basing rod with the blade is placed in the die and the blade is straightened in the die under isothermal conditions with subsequent holding under pressure during the time of relaxation of stresses in the blade; after that, the blade is cooled together with the basing rod. Blade root profile geometry is controlled after straightening with subsequent straightening in case of repeated deviations of blade parameters.

EFFECT: invention makes it possible to achieve initial geometry of blade aerofoil profile with preservation after straightening of resource characteristics at the level specified by design documentation.

1 cl, 2 dwg