LARGE-SIZE BLADE PROFILE STRAIGHTENING DIE Russian patent published in 2024 - IPC B21J13/02 B21K3/04 

FIELD: metal forming.

SUBSTANCE: invention relates to metal forming and can be used in reconstruction of large-size blade aerofoil geometry at detection of bends of its leading and trailing edges. Die for straightening comprises an upper part, a lower part, which are made with possibility of connection and disconnection, and guide columns, mounted in the upper part with the possibility of installation in the corresponding coaxial holes of the lower part, wherein upper part has working passage made with a shape corresponding to the shape of the trough of the said blade, while lower part has working passage with a shape corresponding to the shape of the blade back. At that, each of the working passages contains a cavity, the width of which is not less than double the maximum distance from the longitudinal axis of the above blade to the location of the section with the maximum thickness of the blade aerofoil with allowance for allowances. Said cavities are made symmetrically relative to the longitudinal axis of the blade placed in the die with the possibility of placing a basing rod in them, and on the side of the blade aerofoil ends on the working passages of each of the said parts symmetrically relative to the longitudinal axis of the blade placed in the die there are cylindrical recesses with the possibility of placing the basing rod bosses in them, wherein on the lower part, perpendicular to the plane of the die joint on the side of the blade tail and on the side of its aerofoil, basing pins are installed, and on the upper part, blind holes are made corresponding to the location of the basing pins with the possibility of installing pins in these holes.

EFFECT: use of the invention increases accuracy of the geometry of the profile of the restored blade.

3 cl, 5 dwg