Device and method for treating a metal part

Patent metadata

Field	Value
Publication number	US-2020122296-A1
Application number	US-201716473539-A
Country	US
Kind code	A1
Filing date	Dec 22, 2017
Priority date	Dec 26, 2016
Publication date	Apr 23, 2020
Grant date	—

Abstract

A device for treating a metal part having an outer surface, includes a chamber, a vibration module including: a generator for generating an electric signal at ultrasonic frequency, a converter for converting the electric signal into a mechanical vibration, the mechanical vibration being transmitted to a sonotrode, the sonotrode positioned in the chamber facing the outer surface of the metal part, projectiles positioned inside the chamber for impacting against the outer surface of the metal part, the projectiles being moved by the vibration of the sonotrode and including a plurality of abrasive media which, when moved by the vibration of the sonotrode, introduce residual compressive stresses and improve the surface condition of the metal part.

First claim

1 . Device for treating a metal part having an outer surface, said device comprising:
an enclosure, a vibration module comprising:
a generator for generating an electrical signal at ultrasonic frequency,
a converter for converting said electrical signal into a mechanical vibration, said mechanical vibration being transmitted to a sonotrode,
the sonotrode positioned in said enclosure facing the outer surface of the metal part,
projectiles placed in the enclosure for impacting the outer surface of the metal part, said projectiles being moved by the vibration of the sonotrode,
wherein the projectiles comprise a plurality of abrasive media which, when moved by the vibration of the sonotrode, introduce residual compressive stresses and improve the surface condition of the metal part.

2 . The device for treating a metal part according to claim 1 , further comprising a suction system sucking up 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.

3 . The device for treating a metal part according to claim 2 , further comprising a filter only allowing the passage of residues of the metal part and residues of projectiles from the enclosure to the suction system.

4 . The device for treating a metal part according to claim 1 , wherein the abrasive media have a thickness comprised in the interval [0.8 mm, 10 mm],

5 . The device for treating a metal part according to claim 1 , wherein at least one abrasive medium of the plurality of abrasive media comprises a base made of one of the following materials:
plastic, ceramic, organic.

6 . The device for treating a metal part according to claim 1 , wherein at least one abrasive medium of the plurality of abrasive media comprises an abrasive charge having a hardness comprised in the interval [8 Mohs, 10 Mohs].

7 . The device for treating a metal part according to claim 6 , wherein the abrasive charge is constituted of at least one of the following compounds:
corundum, alumina, boron nitride, silicon carbide, boron carbide, diamond.

8 . The device for treating a metal part according to claim 1 , wherein at least one abrasive medium of the plurality of abrasive media has a shape among the following:
cylindrical, spherical, pyramidal, conical.

9 . The device for treating a metal part according to claim 1 , wherein the electrical signal is emitted at an ultrasonic frequency comprised in the interval [15 kHz, 60 kHz].

10 . The device for treating a metal part according to claim 1 , wherein an amplitude of the sonotrode is comprised in the interval [10 μm, 300 μm].

11 . 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, emission of a sinusoidal electrical signal according to a predetermined frequency, amplitude and duration by means of a 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.

Assignees

• Safran Aircraft Engines

Inventors

• Morancais Amélie
• Besson Laurianne
• Dang Nathalie
• Sok Christian

Classifications

• B24C1/08 Primary

  for polishing surfaces, e.g. {smoothing a surface} by making use of liquid-borne abrasives · CPC title

• C21D7/06

  by shot-peening or the like · CPC title

• B24C5/005

  Vibratory devices, e.g. for generating abrasive blasts by ultrasonic vibrations (sonic cleaning in general B08B3/12) · CPC title

• B24C1/10 Primary

  for compacting surfaces, e.g. shot-peening (for deforming sheet metal, tubes or profiles B21D31/06; as a metallurgical treatment C21D7/00, C22F1/00) · CPC title

• B24C9/003

  Removing abrasive powder out of the blasting machine · CPC title