METHOD FOR MANUFACTURING TURBINE ROTOR BLADE

摘要

The present invention addresses the problem of providing a method for manufacturing a turbine rotor blade wherein warping, bending and twisting of the entire rotor blade, which is provided with an excess thickness portion after a forging step, can be suppressed. In the forging step in a process for manufacturing a rotor blade (23), the forging is hot-forged such that the distance (the excess thickness amount) from the blade surface of the blade section (23) to the surface of the excess thickness section is substantially uniform along the entire periphery of a cross section of the blade section (23) and the excess thickness section (31) perpendicular to the blade length direction, and such that the amount of the excess thickness in the blade length direction, which is the thickness of the excess thickness section (31), gradually increases toward the blade tip from a prescribed position.

主权项

1. A method for manufacturing a turbine rotor blade in which a plurality of the rotor blades are fixed to be arranged along the peripheral direction of a rotor on the outer periphery of the rotor rotatably supported in a turbine, comprising:
a forging step of providing an excess thickness section on a blade section of the rotor blade, and molding a forging, in which an excess thickness amount which is the thickness of the excess thickness section gradually increases from a prescribed position of the blade section in a blade length direction toward a blade tip side, by die forging; and a machining step of cutting the excess thickness section from the forging and forming the blade section.