Protection mask for surface treatment of turbomachine blades
View Patent ↗A protection mask used during surface treatment for a turbomachine blade, including for example a sand blasting step and/or a metal coating step, includes at least one part matching the shape of a portion of the blade. The mask is designed to resist surface treatment effects and to be placed on the surface to be protected, and can form a removable and reusable tool according to the invention.
1. A protection mask for surface treatment of surfaces of a turbomachine blade comprising a root wherein said surfaces are located on the root of the blade, said protection mask comprising:
at least one part matching a shape of the root, and
openings having a same shape as a shape of said surfaces and wherein said surfaces to be treated can be seen through said openings when said at least one part is mounted on said root.
2. A mask according to claim 1 , wherein said at least one part comprises at least two half-shells.
3. A mask according to claim 1 , wherein said at least one part is made of a material resistant to thermal effects of a plasma deposition.
4. A mask according to claim 1 , wherein said at least one part is made of a material resistant to thermal effects of sand blasting.
5. A mask according to claim 1 , wherein said at least one part is made of stainless steel.
6. A mask according to claim 5 , wherein said at least one part is configured to be mounted on said root of said blade by force fitting.
7. A mask according to claim 1 , wherein said at least one part is made of a silicone.
8. A mask according to claim 2 , wherein said at least two half-shells are held together by at least one of bolts and clamps.
9. A mask according to claim 2 , wherein said at least two half-shells are made of stainless steel.
10. A mask according to claim 1 , wherein said at least one part is made of a polymer material.
11. A mask according to claim 1 , wherein said at least one part has a dovetail cross-section so as to fit over a root having a dovetail shape.
12. A mask according to claim 1 , wherein said openings are defined by walls that are perpendicular to said surfaces.
13. A mask according to claim 1 , wherein said at least one part defines a groove.
14. A mask according to claim 13 , wherein said groove is located on a wall covering a bottom of said root.
15. A mask according to claim 1 , wherein said at least one part is mounted on said root of said blade so that said openings expose said surfaces.
16. A mask according to claim 1 , wherein said at least one part is resistant to effects of said surface treatment.
17. A mask according to claim 16 , wherein said at least one part is removable from said blade after said surface treatment.
18. A mask according to claim 17 , wherein said at least one part is reusable for treating surfaces of another blade.
19. A protection mask for surface treatment of a surface of a tubromachine blade comprising a fin, wherein said surface is located at an end of the fin, said protection mask comprising:
two half shells matching a shape of the fin and assembled with each other by clamps.
20. A mask according to claim 19 , wherein said two half shells define a window that exposes said end of said fin when said two half shells are mounted on said turbomachine blade.
21. A mask according to claim 20 , wherein said window is defined by walls that are perpendicular to said surface.
22. A mask according to claim 19 , wherein said two half shells are resistant to effects of said surface treatment.
23. A mask according to claim 22 , wherein said two half shells are removable from said turbomachine blade after said surface treatment.
24. A mask according to claim 23 , wherein said two half shells are reusable for treating a surface of another turbomachine blade.