Method and apparatus for surface treating and prestressing the i

Details Method and apparatus for surface treating and prestressing the i Method and apparatus for surface treating and prestressing the i

1995-02-03

1996-04-23

Jones, David

Metal deforming

By shot-blasting

72710, 451 76, 451910, B24C 100

Patent

active

055092861

ABSTRACT:
The present invention relates to a method and apparatus for surface treating and putting under compression prestress the inside wall of a cavity, in particular a cylindrical cavity of circular section. The apparatus comprises a bulb-shaped vibrator provided with a tubular portion designed to be engaged in an orifice of a cavity to be treated. It is associated with a vibration exciter designed to excite the vibrator at its resonant frequency. The treatment is obtained by shot in the form of balls being projected against the walls of the cavity and returned into the treatment field by a reflector. The method is particularly applicable to treating holes that are designed to receive the fixing pins of turbine blades.

REFERENCES:
patent: 5085747 (1992-02-01), Nikano
Database WPI, Week 7915, Derwent Publications Ltd., London, GB; AN 79-D2749B/15 & SU-A-608 564 (Stebelkov) 24 May 1978.
Database WPI, Week 9035, 10 Oct. 1990, Derwent Publications, Ltd., London, GB; AN 90-266661/35 & SU-A-1 521 564 (Lengd Turbine Blade) 15 Nov. 1989.

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