Method for manufacturing blisk, and blisk intermediate product

A method for manufacturing a blisk including a circular disk and a plurality of rotor blades arranged at intervals in a circumferential direction along an outer peripheral surface of the disk, the method comprising:

• an intermediate product molding step of molding a blisk intermediate product including a circular disk-corresponding part having a cutting margin in addition to the disk, a plurality of rotor blade-corresponding parts arranged at intervals in a circumferential direction along an outer peripheral surface of the disk-corresponding part and each having a cutting margin in addition to the respective rotor blades, and bridges each connecting a front edge of one of each pair of the rotor blade-corresponding parts adjacent to each other and a rear edge of another one of the rotor blade-corresponding parts;
• a disk finishing step of cutting the disk-corresponding part so as to finish the disk-corresponding part into a form of the disk;
• and
• a rotor blade finishing step of sequentially cutting the respective rotor blade-corresponding parts in a direction from a tip end to a base side of the respective rotor blade-corresponding parts while each bridge is removed so as to finish the respective rotor blade-corresponding parts into a form of the respective rotor blades,
• wherein the blisk intermediate product is molded such that a metal block is subjected to forging processing in the intermediate product molding step.