Fixture for an airfoil shroud and method for modifying an airfoil shroud

Patent metadata

Field	Value
Publication number	US-9567860-B2
Application number	US-201213685943-A
Country	US
Kind code	B2
Filing date	Nov 27, 2012
Priority date	Nov 27, 2012
Publication date	Feb 14, 2017
Grant date	Feb 14, 2017

Abstract

According to one aspect, a fixture for an airfoil shroud having a first end edge, a second end edge, a leading edge, a trailing edge, a radially outer side and a radially inner side with respect to a rotor axis of a bucket having the airfoil shroud is provided. The fixture includes a base plate, a first member extending from the base plate configured to locate and abut the first end edge, a second member extending from the base plate configured to locate and abut a side of a seal rail, a third member extending from the base plate configured to locate and abut the radially outer side of the airfoil shroud and a template recess formed in the base plate proximate the first end edge to define a geometry of a relief cut in the trailing edge of the airfoil shroud.

First claim

The invention claimed is:

1. A fixture for an airfoil shroud having a first end edge, a second end edge, a leading edge, a trailing edge, a radially outer side and a radially inner side with respect to a rotor axis of a bucket having the airfoil shroud, the fixture comprising:
a base plate configured to be disposed on one of the radially outer side and radially inner side of the airfoil shroud;
a first member extending from the base plate configured to locate and abut the first end edge, wherein the first end edge is proximate a trailing edge of an airfoil of the bucket;
a second member extending from the base plate configured to locate and abut a side of a seal rail circumferentially extending from the radially outer side of the airfoil shroud, wherein surfaces of the first end edge and the side of the seal rail are substantially parallel to an axis of the airfoil;
a third member extending from the base plate configured to locate and abut the radially outer side of the airfoil shroud; and
a template recess formed in the base plate proximate the first end edge to define a geometry of a relief cut in the trailing edge of the airfoil shroud.

2. The fixture: of claim 1 , wherein the base plate has an inner surface substantially parallel to the radially outer side of the airfoil shroud.

3. The fixture of claim 1 , wherein the first member comprises an axial member extending from the base plate such that a side of the axial member abuts the first end edge.

4. The fixture of claim 1 , wherein the template recess comprises a recess defining an edge of the base plate.

5. The fixture of claim 4 , Wherein the template recess comprises an arc-shaped recess.

6. The fixture of claim 1 , wherein the second member comprises a pair of members extending substantially parallel to a airfoil axis such that ends of the pair of members abut the side of the seal rail.

7. The fixture of claim 1 , wherein the second member abuts a trailing edge side of the seal rail to provide positioning in a circumferential direction for the airfoil shroud.

8. The fixture of claim 7 , wherein the first member provides positioning in a direction substantially parallel to the rotor axis.

9. The fixture of claim 1 , wherein the third member comprises a pair of members extending axially from the base plate such that ends of the pair of members abut the radially outer side of the airfoil shroud.

10. The fixture of claim 1 , further comprising:
at least one fourth member extending from the base plate configured to locate and abut the radially inner edge of the airfoil shroud.

11. The fixture of claim 10 , wherein the at least one fourth member is located on an opposite side of the seal rail from the second member.

12. The fixture of claim 10 , wherein the at least one fourth member is configured to locate and abut the leading edge of the airfoil shroud.

13. The fixture of claim 10 , wherein the at least one fourth member is biased to urge the airfoil shroud toward an inner surface of the base plate.

14. The fixture of claim 10 , wherein the at least one fourth member abuts the leading edge side of the airfoil shroud to provide positioning in a circumferential direction for the airfoil shroud.

15. The fixture of claim 10 , wherein the at least one fourth member abuts the leading edge side of the airfoil shroud to provide positioning in a direction substantially parallel to the rotor axis.

16. The fixture of claim 10 , wherein the at least one fourth member comprises a first fourth member and a second fourth member, the first fourth member abuts the leading, edge side of the airfoil shroud to provide positioning in a circumferential direction for the airfoil shroud, and the second fourth member abuts the leading edge side of the airfoil shroud to provide positioning in a direction substantially parallel to the rotor axis.

17. The fixture of claim 1 , wherein the first member, the second member, and the third member are biased to urge the airfoil shroud into position.

18. The fixture of claim 10 , wherein the first member, the second member, the third member, and the at least one fourth member are biased to urge the airfoil shroud into position.

Assignees

• Gen Electric

Inventors

• Salm Jacob Andrew
• Connor James Ryan
• Ward Jr John David

Classifications

• Y10T29/49318

  Repairing or disassembling · CPC title

• F01D5/005

  Repairing methods or devices · CPC title

• F05D2260/94

  Functionality given by mechanical stress related aspects such as low cycle fatigue [LCF] of high cycle fatigue [HCF] · CPC title

• F05D2270/332

  Maximum loads or fatigue criteria · CPC title

• F01D5/225 Primary

  by shrouding · CPC title