Sonats-societe Des Nouvelles Applications Des Techniques De Surfaces

Snecma

General Electric Company

Mtu Aero Engines Gmbh

Sonats

Saipem S.a.

Jean-Michel Duchazeaubeneix

Patrick Cheppe

Vincent Desfontaine

Philippe Jacob

Erwin Bayer

Raymond Joseph Stonitsch

Eric Kerdiles

Diane Marie Beagle

Stephen Hoffmann-Ivy

Ray Stonitsch

Diane Beagle

Ultrasonic peening treatment is desirable where an application of a compressive stress is helpful to reduce the incidence of crack formation on highly stressed parts. Ultrasonic peening treatment can be performed in field applications without requiring a rotor to be removed from the machine. The system includes an acoustic element that excites peening media within a peen chamber. A frame is attachable to an assembled turbine rotor component and includes support structure engageable with the acoustic element. The frame is cooperable with a chamber tooling that defines and encloses the peen chamber together with the turbine rotor component.

Ultrasonic peening treatment of assembled components

The present invention provides a method of shot peening at least a portion of a rotary machine comprising a rotor. Shot peening is carried out with a rotor which is at least partly assembled. The method comprises:

Shot peening methods and units

Shot for use in a peening installation, the shot having:

Shot, devices, and installations for ultrasonic peening, and parts treated thereby

A system for ultrasonically peeing surfaces includes a sonotrode comprising a body material and a vibrating surface, the vibrating surface coated with a coating material having a hardness greater than the body material, a treatment chamber defined at least in part by the vibrating surface, and at least one piece of shot within the treatment chamber to be excited by the vibrating surface of the sonotrode, the at least one piece of shot having a hardness greater than or equal to 800 HV.

In a method for surface blasting hollow spaces or cavities, especially cavities of gas turbines, shot balls are accelerated with the aid of at least one vibrator, whereby the ultrasonically accelerated shot balls are directed onto surfaces of a cavity that is to be blasted. The vibrator is preferably positioned with a small spacing distance, preferably on the order of magnitude of the diameter of the shot balls utilized for the blasting, from the cavity to be blasted.

Method for surface blasting cavities, particularly cavities in gas turbines

The present invention provides a method of shot peening at least a portion of a rotary machine comprising a rotor. Shot peening is carried out with a rotor which is at least partly assembled. The method includes

Acoustic shot peening method and apparatus

A part to be shot peened includes at least one thin wall (&#x2033;) defining two opposite main faces, the square root of the area of each face being greater than the mean distance between the two faces by a factor of at least five, and preferably by a factor of at least ten. According to the method, the part is caused to rotate at least intermittently relative to one or more vibrating surfaces, with at least one of the main faces being exposed to projectiles () set into motion by one or more of the vibrating surfaces, treatment taking place progressively on the face(s) so as to impart compression stresses thereto, with a portion only of the part being treated at any one time and with regions of the part preferably being exposed on several occasions to the projectiles, with relative rotation taking place between the exposures.

Method of shot blasting and a machine for implementing such a method

The invention relates to apparatus for surface treatment by impact, the apparatus comprising a vibrating surface and at least one projectile suitable for being projected towards the surface to be treated by said vibrating surface. The apparatus includes retaining means for keeping each projectile captive in the apparatus.

Growing community of inventors

Les Sorinieres, France

Jean-Michel Duchazeaubeneix