Systems and methods for polishing airfoils

Patent metadata

Field	Value
Publication number	US-9764447-B2
Application number	US-201615048595-A
Country	US
Kind code	B2
Filing date	Feb 19, 2016
Priority date	Oct 28, 2013
Publication date	Sep 19, 2017
Grant date	Sep 19, 2017

Abstract

A sleeve may be configured to secure an airfoil cluster for polishing. The sleeve may include a mock airfoil and a bypass flow path between the mock airfoil and an end wall of the sleeve. The sleeve may be positioned in an annular ring of sleeves in a polishing apparatus. The polishing apparatus may comprise an annular flow path for an abrasive fluid. The abrasive fluid may be flowed through the annular ring of sleeves in order to polish the airfoil cluster.

First claim

The invention claimed is:

1. A polishing assembly comprising:
a first distributor plate;
a first carrier plate coupled to the first distributor plate, the first carrier plate comprising a first receiving slot;
a second carrier plate comprising a second receiving slot;
a second distributor plate, wherein the second carrier plate is located between the first carrier plate and the second distributor plate; and
a sleeve positioned within the first receiving slot and the second receiving slot, wherein an airfoil cluster is secured within the sleeve.

2. The polishing assembly of claim 1 , wherein the sleeve comprises a mock airfoil.

3. The polishing assembly of claim 1 , wherein the first distributor plate comprises a first distributing cone, and wherein the second distributor plate comprises a second distributing cone.

4. The polishing assembly of claim 1 , further comprising a support plate coupled to the second distributor plate.

5. The polishing assembly of claim 4 , wherein the support plate comprises steel.

6. The polishing assembly of claim 1 , wherein at least one of the first distributor plate, the first carrier, the second carrier, and the second distributor plate comprise nylon.

7. The polishing assembly of claim 1 , wherein the first distributing cone is coupled to a distributor plate periphery via a brace.

8. The polishing assembly of claim 7 , wherein the first distributing cone, the distributor plate periphery, and the brace define a distributing flow path.

9. The polishing assembly of claim 1 , wherein the first carrier plate further comprises a directional flow path.

10. The polishing assembly of claim 9 , wherein the directional flow path is configured to direct abrasive fluid from the first distributor plate through a sleeve flow path in the sleeve located within the first receiving slot and the second receiving slot.

11. A method of polishing an airfoil cluster comprising:
positioning the airfoil cluster within a sleeve and between two mock airfoils in the sleeve;
positioning the sleeve within a receiving slot in a polishing assembly; and
directing an annular flow of an abrasive fluid through the sleeve.

12. The method of claim 11 , further comprising directing the abrasive fluid through a bypass flow path in the sleeve.

13. The method of claim 11 , wherein the sleeve is one of a plurality of sleeves, and wherein the method further includes positioning the plurality of sleeves in an annular arrangement within the receiving slot and a second receiving slot.

14. The method of claim 11 , further comprising reversing a flow direction of the abrasive fluid.

15. The method of claim 11 , wherein the airfoil cluster comprises a turbine stator segment for a gas turbine engine.

16. A sleeve for polishing an airfoil cluster comprising:
an inner shroud;
an outer shroud;
a first end wall extending between the inner shroud and the outer shroud;
a second end wall extending between the inner shroud and the outer shroud;
a first mock airfoil extending between the inner shroud and the outer shroud; and
a second mock airfoil extending between the inner shroud and the outer shroud.

17. The sleeve of claim 16 , wherein the first mock airfoil, the first end wall, the inner shroud, and the outer shroud define a bypass flow path for an abrasive flow path.

18. The sleeve of claim 16 , further comprising an airfoil cluster coupled to the outer shroud and positioned between the first mock airfoil and the second mock airfoil.

19. A method of polishing an airfoil cluster comprising:
positioning the airfoil cluster within a sleeve;
positioning the sleeve within a receiving slot in a polishing assembly;
directing an annular flow of an abrasive fluid through the sleeve; and
directing the abrasive fluid through a bypass flow path in the sleeve.

20. A method of polishing an airfoil cluster comprising:
positioning the airfoil cluster within a sleeve, wherein the airfoil cluster comprises a turbine stator segment for a gas turbine engine;
positioning the sleeve within a receiving slot in a polishing assembly; and
directing an annular flow of an abrasive fluid through the sleeve.

Assignees

• United Technologies Corp

Inventors

• Beckman Micah
• Erickson Robert E
• Livchitz Daniel

Classifications

• B24C3/327

  by an axially-moving flow of abrasive particles without passing a blast gun, impeller or the like along the internal surface (polishing or abrading surfaces using plastically deformable grinding compound, moved relatively to the workpiece under the influence of pressure B24B31/116) · CPC title

• B24B31/116

  using plastically deformable grinding compound, moved relatively to the workpiece under the influence of pressure · CPC title

• B24B19/14

  for grinding turbine blades, propeller blades or the like (using grinding belts B24B21/16) · CPC title

• B24C1/083 Primary

  Deburring · CPC title