METHODS FOR MODIFYING COOLING HOLES WITH RECESS-SHAPED MODIFICATIONS AND COMPONENTS INCORPORATING THE SAME

• US 20150030460A1
• Filed: 07/23/2013
• Published: 01/29/2015
• Est. Priority Date: 07/23/2013
• Status: Active Grant

• Current Assignee: GE Infrastructure Technology, LLC (General Electric Company)
• Original Assignee: General Electric Company
• Inventors: Kottilingam, Srikanth Chandrudu, Cui, Yan, Tollison, Brian Lee, Schick, David Edward, Lomas, Jonathan Matthew, Lewis, Gareth William David
• Granted Patent: US 9,765,623 B2
• Time in Patent Office: Days
• US Class Current: 416/97.R
• CPC Class Codes: B23P 2700/06 Cooling passages of turbine components, e.g. unblocking or preventing blocking of cooling passages of turbine components
• CPC Class Codes: B23P 6/005 using only replacement pieces of a particular form
• CPC Class Codes: F01D 5/005 Repairing methods or devices
• CPC Class Codes: F01D 5/182 Transpiration cooling
• CPC Class Codes: F01D 5/186 Film cooling F01D5/187 takes precedence
• CPC Class Codes: F01D 5/187 Convection cooling
• CPC Class Codes: F01D 5/20 Specially-shaped blade tips to seal space between tips and stator F01D5/225 takes precedence
• CPC Class Codes: F05D 2230/22 by sintering
• CPC Class Codes: F05D 2230/236 Diffusion bonding
• CPC Class Codes: F05D 2230/80 Repairing, retrofitting or upgrading methods
• CPC Class Codes: F05D 2240/307 related to the tip of a rotor blade
• CPC Class Codes: Y02T 50/60 Efficient propulsion technologies, e.g. for aircraft
• CPC Class Codes: Y10T 29/49318 Repairing or disassembling
• CPC Class Codes: Y10T 29/49737 Metallurgically attaching preform
• CPC Class Codes: Y10T 29/49902 by manipulating aligning means

Abstract

Methods for modifying a plurality of cooling holes of a component include disposing a recess-shaped modification in a recess of the component comprising a plurality of cooling hole outlets, wherein the recess-shaped modification is formed to substantially fill the recess and comprising a plurality of modified cooling holes passing there through. The method further includes aligning the plurality of modified cooling holes of the recess-shaped modification with the plurality of cooling hole outlets of the component, and, bonding the recess-shaped modification disposed in the recess to the component, wherein the plurality of modified cooling holes of the recess-shaped modification is fluidly connected with the plurality of cooling holes of the component.

Claims

1. A method for modifying a plurality of cooling holes of a component, the method comprising:

disposing a recess-shaped modification in a recess of the component comprising a plurality of cooling hole outlets, the recess-shaped modification formed to substantially fill the recess and comprising a plurality of modified cooling holes passing there through;

aligning the plurality of modified cooling holes of the recess-shaped modification with the plurality of cooling hole outlets of the component; and

,

bonding the recess-shaped modification disposed in the recess to the component, wherein the plurality of modified cooling holes of the recess-shaped modification is fluidly connected with the plurality of cooling holes of the component.

2. The method of claim 1 further comprising removing an outer portion of the component to form the recess prior to disposing the recess-shaped modification therein.

3. The method of claim 1, wherein aligning the plurality of modified cooling holes of the recess-shaped modification with the plurality of cooling hole outlets of the component comprises inserting at least one alignment pin into at least one of the modified cooling holes of the recess-shaped modification and at least one of the cooling holes of the component.

4. The method of claim 1, wherein the component comprises a turbine bucket and the plurality of cooling hole outlets are disposed at a bucket tip.

5. The method of claim 1, wherein the recess filled by the recess-shaped modification is adjacent a trailing edge of the turbine bucket.

6. The method of claim 1, wherein the recess-shaped modification comprises a pre-sintered preform, wherein the pre-sintered preform comprises a mixture comprising a base alloy and a second alloy, the base alloy comprising about 30 weight percent to about 90 weight percent of the mixture and the second alloy comprising a sufficient amount of a melting point depressant to have a lower melting temperature than the base alloy.

7. The method of claim 6, wherein the pre-sintered preform is formed by combining base alloy particles and second alloy particles with a binder to form a combined powder mixture, compacting the combined powder mixture to form a compacted preform, and heating the compacted preform to remove the binder and form the pre-sintered preform.

8. A method for modifying a plurality of cooling holes of a component, the method comprising:

disposing a recess-shaped modification in a recess of the component comprising a plurality of cooling hole outlets, the recess-shaped modification formed to substantially fill the recess;

forming a plurality of modified cooling holes through the recess-shaped modification that align with the plurality of cooling hole outlets of the component; and

bonding the recess-shaped modification in the recess to the component, wherein the plurality of modified cooling holes of the recess-shaped modification is fluidly connected with the plurality of cooling holes of the component.

9. The method of claim 8 further comprising removing an outer portion of the component to form the recess prior to disposing the recess-shaped modification therein.

10. The method of claim 8, wherein the component comprises a turbine bucket and the plurality of cooling hole outlets are disposed at a bucket tip.

11. The method of claim 10, wherein the recess filled by the recess-shaped modification is adjacent a trailing edge of the turbine bucket.

12. The method of claim 8, wherein the recess-shaped modification comprises a pre-sintered preform, wherein the pre-sintered preform comprises a mixture comprising a base alloy and a second alloy, the base alloy comprising about 30 weight percent to about 90 weight percent of the mixture and the second alloy comprising a sufficient amount of a melting point depressant to have a lower melting temperature than the base alloy.

13. The method of claim 12, wherein the pre-sintered preform is formed by combining base alloy particles and second alloy particles with a binder to form a combined powder mixture, compacting the combined powder mixture to form a compacted preform, and heating the compacted preform to remove the binder and form the pre-sintered preform.

14. The method of claim 8, forming the plurality of modified cooling holes through the recess-shaped modification occurs after the recess-shaped modification is bonded to the component.

15. A modified component comprising:

an original component base comprising a plurality of cooling holes therein, the plurality of cooling holes having a plurality of cooling hole outlets at a recess;

a recess-shaped modification disposed in the recess and comprising a plurality of modified cooling holes that align with the plurality of cooling hole outlets of the original component base; and

,

wherein, the recess-shaped modification is bonded to the original component base such that the plurality of modified cooling holes of the recess-shaped modification is fluidly connected with the plurality of cooling holes of the original component base.

16. The modified component of claim 15, wherein the original component base comprises a turbine bucket and the plurality of cooling hole outlets is disposed at a bucket tip.

17. The modified component of claim 16, wherein the recess-shaped modification is adjacent a trailing edge of the turbine bucket.

18. The modified component of claim 15, wherein the recess-shaped modification comprises a pre-sintered preform, wherein the pre-sintered preform comprises a mixture comprising a base alloy and a second alloy, the base alloy comprising about 30 weight percent to about 90 weight percent of the mixture and the second alloy comprising a sufficient amount of a melting point depressant to have a lower melting temperature than the base alloy.

19. The modified component of claim 18, wherein the pre-sintered preform is formed by combining base alloy particles and second alloy particles with a binder to form a combined powder mixture, compacting the combined powder mixture to form a compacted preform, and heating the compacted preform to remove the binder and form the pre-sintered preform.

20. The modified component of claim 17, wherein the base alloy and the component share a common composition.