Method for producing integrally bladed rotor, program for cutting blade of integrally bladed rotor, and integrally bladed rotor

A non-transitory computer readable storage medium retrievably storing a computer-executable program therein, the computer-executable program causing a computer to perform a method for producing an integrally bladed rotor from a pre-machined bladed rotor including a rotor disc and blades which are integrally provided around the rotor disc and each of which has a positive-pressure surface and a negative-pressure surface opposite to the positive-pressure surface to have a ridge of a front edge and a ridge of a rear edge at which the positive-pressure surface and the negative-pressure surface merge, the method comprising:

• providing imaginary front lattice points on the ridge of the front edge and imaginary rear lattice points on the ridge of the rear edge;
• providing a first imaginary line on the positive-pressure surface and the negative-pressure surface to connect a first imaginary front lattice point among the imaginary front lattice points and a first imaginary rear lattice point among the imaginary rear lattice points;
• providing a second imaginary line on the positive-pressure surface and the negative-pressure surface to connect a second imaginary front lattice point next to the first imaginary front lattice point among the imaginary front lattice points and a second imaginary rear lattice point next to the first imaginary rear lattice point among the imaginary rear lattice points;
• generating machining command including a spiral path on the positive-pressure surface and the negative-pressure surface by connecting the first imaginary line and the second imaginary line with a spiral curve;
• and
• cutting the positive-pressure surface and the negative-pressure surface of each of the blades by moving a cutting point corresponding to a cutting edge of a turning tool on the positive-pressure surface and the negative-pressure surface according to the machining command.