Method for the construction of bladed discs for radial turbomachines and a bladed disc obtained by means of this method

A method for construction of bladed discs for radial turbomachines, comprising:

• preparing a disc provided with a front face;
• preparing a plurality of reinforcement rings with different diameters;
• wherein preparing the disc comprises:
• realizing annular sets of blades in one piece with said disc, the sets of blades being concentric and coaxial with a central axis of said disc and arranged on said front face, wherein each blade has a leading edge and a trailing edge parallel to said central axis,
• and/or
• wherein preparing a plurality of reinforcement rings comprises:
• realizing in one piece with each one of the reinforcement rings an annular set of auxiliary blades arranged around a central axis of the reinforcement ring, wherein each auxiliary blade has a leading edge and a trailing edge parallel to said central axis of the reinforcement ring;
• and
• applying each one of the reinforcement rings to the disc at one of the annular sets of blades and/or auxiliary blades, so as to define on the front face annular sets of blades and/or auxiliary blades, each one provided with a respective reinforcement ring;
• wherein, for each set, blades are made in one piece with said disc and auxiliary blades are made in one piece with the respective reinforcement ring.

A method for construction of bladed discs for radial turbomachines, comprising:

• preparing a disc provided with a front face;
• preparing a plurality of reinforcement rings with different diameters;
• wherein preparing the disc comprises:
• preparing a solid disc, removing material from the solid disc to define on the front face a plurality of annular reliefs concentric and coaxial with a central axis of said disc, realizing annular sets of blades in one piece with said disc by removing material from each of the annular reliefs until one of the annular sets of blades is defined for each annular relief, the sets of blades being concentric and coaxial with a central axis of said disc and arranged on said front face, wherein each blade has a leading edge and a trailing edge parallel to said central axis, each one of the reinforcement rings being applied on terminal ends of the blades,
• and/or
• wherein preparing a plurality of reinforcement rings comprises:
• realizing in one piece with each one of the reinforcement rings an annular set of auxiliary blades arranged around a central axis of the reinforcement ring, wherein each auxiliary blade has a leading edge and a trailing edge parallel to said central axis of the reinforcement ring;
• and
• applying each one of the reinforcement rings to the disc at one of the annular sets of blades and/or auxiliary blades, so as to define on the front face annular sets of blades and/or auxiliary blades, each one provided with a respective reinforcement ring;
• wherein realizing the blades comprises applying at least one electrode against at least one annular relief;
• wherein said at least one electrode has a plurality of working portions spaced one away from the other and each one shaped like the volume comprised between two adjacent blades, to remove material between a number of blades at the same time and to define passages between said blades.