# US 9,517,537 B2 · Method for reshaping a turbomachine blade that has at least one zone that has become deformed using peening

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- Number: US 9,517,537 B2
- Document ID: US9517537B2
- Status: Granted
- Kind: B2
- Application number: 14/358,440
- Filed: 2012-12-05
- Published: 2014-11-06
- Granted: 2016-12-13
- Earliest claimed: 2011-12-07
- Assignees: Snecma
- Applicants: Snecma
- Inventors: Gerard Derrien
- Web page: https://patentgrep.com/patent/US9517537B2

## CPC

- B23P 6/002: {Repairing turbine components, e.g. moving or stationary blades, rotors, (B23P6/045 takes precedence)}
- B21D 31/06: Deforming sheet metal, tubes or profiles by sequential impacts, e.g. hammering, beating, peen forming (forging hammers B21J7/00)
- B23P 9/04: Treating or finishing by hammering or applying repeated pressure
- B24B 1/04: subjecting the grinding or polishing tools, the abrading or polishing medium or work to vibration, e.g. grinding with ultrasonic frequency (involving oscillating or vibrating containers B24B31/06; superfinishing surfaces on work, e.g. by means of abrading blocks reciprocating with high frequency, B24B35/00)
- B24B 39/00: Burnishing machines or devices, i.e. requiring pressure members for compacting the surface zone (modifying the physical properties or structure of metal by burnishing C21D7/08, C22F1/00); Accessories therefor
- B24C 1/04: for treating only selected parts of a surface, e.g. for carving stone or glass
- B24C 1/10: for compacting surfaces, e.g. shot-peening (for deforming sheet metal, tubes or profiles B21D31/06; as a metallurgical treatment C21D7/00, C22F1/00)
- B24C 5/005: {Vibratory devices, e.g. for generating abrasive blasts by ultrasonic vibrations (sonic cleaning in general B08B3/12)}
- F01D 5/005: {Repairing methods or devices}
- F01D 5/34: Rotor-blade aggregates of unitary construction {, e.g. formed of sheet laminae; (discs formed of sheet laminae F01D5/028; ceramic materials F01D5/284, composite materials F01D5/282)}
- B23P 2700/01: Aircraft parts
- C21D 7/00: Modifying the physical properties of iron or steel by deformation (apparatus for mechanical working of metal B21, B23, B24)
- C21D 7/06: by shot-peening or the like
- F05D 2230/90: Coating; Surface treatment
- Y02T 50/60: Efficient propulsion technologies, e.g. for aircraft
- Y10T 29/49336: Blade making
- B23P: METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS (arrangements for copying or controlling B23Q)
- B21D: WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL (working or processing of wire B21F)
- B24B: MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING (grinding of gear teeth B23F, of screw-threads B23G1/36; by electro-erosion B23H; abrasive or related blasting B24C; tools for grinding, buffing or sharpening B24D; polishing compositions C09G1/00; abrasives C09K3/14; electrolytic etching or polishing C25F3/00; grinding arrangements for use on assembled railway tracks E01B31/17); DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24C: ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- F01D: NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES (machines or engines for liquids F03; non-positive displacement pumps F04D)
- C21D: MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING (surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by this subclass C23F17/00; unidirectional solidification of eutectic materials or unidirectional demixing of eutectoid materials C30B)
- F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A method of reshaping a turbine engine blade including at least one deformed zone, the method including peening the deformed zone to be able to restore a shape of the at least one deformed zone.

## Claims

### Claim 1

A method to reshape a turbine engine blade which includes at least one deformed zone, the method comprising:
acquiring a profile of the blade;
comparing the profile with a reference profile so as to deduce therefrom at least one deformed zone of the blade;
dividing the deformed zone into a plurality of non-overlappingly divided deformed zones:
comparing the divided deformed zone with a deformation database including a plurality of divided deformed zones associated respectively with a plurality of parameterizations of a peening device;
determining the parameterization associated with the divided deformed zones;
peening by ultrasonic peening each of the divided deformed zones of the blade individually so as to not significantly raise a temperature of the blade using the peening device as a function of the determined parameterization so as to restore a shape of the deformed zone,
wherein the blade includes two faces opposite one another, and when one of the divided deformed zones is situated on one of the two faces, a surface situated on the other of the two faces opposite the one of the divided deformed zones is free to deform during the peening of the one of the divided deformed zones.

### Claim 2 (depends on 1)

The method according to claim 1, wherein the blade includes a first face and a second face opposite the first face and the deformed zone is situated on the first face, and the second face is not peened during the peening of the first face.

### Claim 3 (depends on 1)

The method according to claim 1, wherein the deformed zone is peened in a direction substantially normal to the deformed zone.

### Claim 4 (depends on 1)

The method according to claim 1, further comprising:
recording in a deformation database an association of the deformed zone with the parameterization of the peening device.

### Claim 5 (depends on 1)

The method according to claim 1, wherein the deformation database includes at least one degree of deformation of the deformed zone.

### Claim 6 (depends on 1)

The method according to claim 1, wherein when no parameterization is associated with the deformed zone in the deformation database, the peening of the deformed zone of the blade is performed by the peening device for a given parameterization of the peening device to restore the shape of the deformed zone; and an association of the deformed zone with the parameterization of the peening device is recorded in the deformation database.

### Claim 7 (depends on 1)

The method according to claim 1, wherein the turbine engine blade is a blade of an integrally bladed rotor.

### Claim 8 (depends on 1)

The method according to claim 1, wherein the second face is not retained during the peening of the first face.

### Claim 9 (depends on 1)

The method according to claim 1, wherein the ultrasonic peening is performed by beads which are projected inside a housing.

### Claim 10 (depends on 1)

The method according to claim 1, further comprising placing a housing with an opening against the blade to form a closed compartment enclosed by the housing and the at least one deformed zone, and peening inside the compartment.

### Claim 11 (depends on 10)

The method according to claim 10, wherein the blade includes a plurality of deformed zones, the method further comprising placing the housing against another of the deformed zones without disassembly of the blade.

### Claim 12 (depends on 1)

The method according to claim 1, further including updating the deformation database based on the peening of the deformed zone, the updating adding to the deformation database a duration of peening associated with a given degree of deformation based the peening of the deformed zone.

### Claim 13 (depends on 1)

The method according to claim 1, wherein the plurality of parameterizations include one of a duration of the peening, a quantity of kinetic energy transmitted to projectiles used in the peening, dimensions of projectiles used in the peening, dimensions of a bell housing used in the peening, speed of projectiles used in the peening, a frequency of impacts, and a number of beads.