Method of processing a semi-finished product for the production of a rotor with integral blades

A processing method of a semi-processed product for obtaining a rotor equipped with a series of blades integral therewith by means of a rotating tool (20) such as a cutter, integral or with inserts, is provided. The processing method comprises phase a) forming a series of cavities (15) on said semi-processed product by means of said rotating tool (20) to create said series of blades, said phase a) comprising phase b) forming a hole (17) in said semi-processed product and phase c) removing material from said semi-processed product by advancing said rotating tool (20) along its rotation axis, and in that said rotation axis of said rotating tool (20) is misaligned with respect to the axis of said hole (17).