Method of repairing a perforated skin of a panel using a doubler

Patent metadata

Field	Value
Publication number	US-10022923-B2
Application number	US-201715585426-A
Country	US
Kind code	B2
Filing date	May 3, 2017
Priority date	Nov 3, 2014
Publication date	Jul 17, 2018
Grant date	Jul 17, 2018

Abstract

The present disclosure relates to a method of repairing a damaged portion of a perforated skin of a panel using a doubler made of composite material which is designed to be applied to the damaged portion of the perforated skin. The method includes at least one step in which a sealing film is applied to the damaged portion of the perforated skin in order to temporarily seal the perforations in the skin, and a step in which the doubler is produced over the previously deposited sealing film.

First claim

What is claimed is:

1. A method for repairing a damaged portion of a perforated skin of a panel by means of a doubler made of a composite material which is designed to be applied on the damaged portion of said perforated skin, the method comprising:
applying a sealing film on the damaged portion of the perforated skin in order to temporarily close perforations of said skin,
manufacturing the doubler on the sealing film applied; and
securing the doubler to the perforated skin, such that the doubler covers the damaged portion of the perforated skin.

2. The method according to claim 1 , wherein the step of applying the sealing film is preceded by a step for determining a maximum curvature point (P) of the damaged portion, the maximum curvature point (P) serving as a starting point for the application of the sealing film.

3. The method according to claim 1 , wherein the sealing film has an outer face which is non-adhesive in order to promote removal of the doubler, and the sealing film has an inner face which is adhesive to promote adhesion of the sealing film on the perforated skin.

4. The method according to claim 1 , wherein subsequent to the step of applying the sealing film, an adhesive tape is placed at least on a peripheral edge of the sealing film to secure the sealing film on the perforated skin.

5. The method according to claim 1 , wherein the step of manufacturing the doubler includes vacuum molding the doubler by means of a bladder which cooperates with the sealing film to form a sealed mold.

6. The method according to claim 5 , wherein the step of manufacturing the doubler further includes an application phase of a seal around the doubler, said seal forming a bead which is interposed between the bladder and the sealing film to form the sealed mold.

7. The method according to claim 6 , wherein subsequent to the step of applying the sealing film, an adhesive tape is placed at least on a peripheral edge of the sealing film to secure the sealing film on the perforated skin, and wherein the seal includes at least one first sealing ring which covers at least a peripheral edge of the adhesive tape and protrudes over the perforated skin, and at least one second sealing ring which covers at least a peripheral edge of the at least one first sealing ring and protrudes over the perforated skin, such that the at least one second sealing ring overlaps the at least one first sealing ring.

8. The method according to claim 1 , wherein the step of manufacturing the doubler includes creating a plurality of acoustic perforations.

9. The method according to claim 1 , wherein the step of securing the doubler to the perforated skin is carried out subsequent to the step of manufacturing the doubler.

10. The method according to claim 9 , wherein the step of securing the doubler is carried out after the sealing film has been removed from the perforated skin.

Assignees

• Safran Nacelles

Inventors

• Delehouze Arnaud
• Sentis Sylvain
• Prunin Philippe
• Boudard Aristide

Classifications

• B32B3/12

  characterised by a layer of regularly- arranged cells, e.g. a honeycomb structure · CPC title

• B29C73/32

  using an elastic element, e.g. inflatable bag · CPC title

• B32B37/146

  whereby one or more of the layers is a honeycomb structure · CPC title

• B29C37/0075

  using release sheets · CPC title

• B29C65/76

  Making non-permanent or releasable joints · CPC title