Device and method for treating a metal part

A method for treating a metal part, comprising:

• placing projectiles in an enclosure, said projectiles comprising a plurality of abrasive media,
• positioning a metal part to treat against an upper end of the enclosure such that an outer surface of the metal part is facing an upper surface of a sonotrode of a vibration module,
• emitting a first sinusoidal electrical signal at a first frequency f1, first amplitude A1 and first duration d1 by means of a generator of the vibration module, emitting a second sinusoidal electrical signal at a second frequency f2, second amplitude A2, for a second duration d2 by means of the generator of the vibration module,
• generation of vibrations of the sonotrode by means of a converter of the vibration module coupled to said sonotrode, said converter converting the electrical signal emitted by the generator into a mechanical vibration transmitted to the sonotrode to move the projectiles which introduce residual compressive stresses and improve the surface condition of the metal part,
• sucking up, with a suction system, residues of the metal part and residues of projectiles derived from the impact of said projectiles with each other and on the outer surface of the metal part, and
• filtering, with a filter, to only allow the passage of residues of the metal part and residues of projectiles from the enclosure to the suction system.