Method of correcting an inappropriate countersink in a composite component

Patent metadata

Field	Value
Publication number	US-10695995-B2
Application number	US-201715606482-A
Country	US
Kind code	B2
Filing date	May 26, 2017
Priority date	May 26, 2016
Publication date	Jun 30, 2020
Grant date	Jun 30, 2020

Abstract

A method of correcting, in a composite component, an inappropriate countersink with an inappropriate maximum diameter and/or depth, the inappropriate countersink being provided in the composite component at a fixation opening having a first opening diameter, the method comprising at least the steps of: Preparing a repair patch; Arranging the repair patch on the composite component in an area surrounding the inappropriate countersink; Pressing the repair patch at least partly into the inappropriate countersink by means of an associated pressure tool; and Fixing the repair patch in the inappropriate countersink.

First claim

What is claimed is:

1. A method of correcting, in a composite component, an inappropriate countersink with an inappropriate maximum diameter and/or depth, the inappropriate countersink being provided in the composite component at a fixation opening having a first opening diameter, the method comprising at least the steps of:
preparing a repair patch with a repair patch opening having a second opening diameter that is at most equal to the first opening diameter;
arranging the repair patch on the composite component in an area surrounding the inappropriate countersink, such that the repair patch opening and the fixation opening are at least approximately aligned;
pressing the repair patch at least partly into the inappropriate countersink by means of an associated pressure tool; and
fixing the repair patch in the inappropriate countersink.

2. The method according to claim 1 , further comprising at least the steps of:
preparing a polytetrafluorethylene tape with a polytetrafluorethylene tape opening having a third opening diameter that corresponds at least approximately to the inappropriate maximum diameter of the inappropriate countersink; and
arranging the polytetrafluorethylene tape on the composite component in the area surrounding the inappropriate countersink, prior to arranging the repair patch on the composite component, such that the polytetrafluorethylene tape opening and the fixation opening are at least approximately aligned, wherein the polytetrafluorethylene tape is arranged between the repair patch and the composite component.

3. The method according to claim 2 ,
wherein the step of pressing the repair patch at least partly into the inappropriate countersink comprises at least the steps of:
positioning a conical extension of the pressure tool over the repair patch such that the conical extension is aligned with the inappropriate countersink, wherein the conical extension is provided with dimensions that correspond at least approximately to inverted appropriate countersink dimensions; and
pressing the pressure tool onto the repair patch such that the conical extension presses an inner portion of the repair patch into the inappropriate countersink.

4. The method according to claim 3 ,
further comprising at least the step of attaching, in a releasable manner, the pressure tool to the composite component by means of an associated clamping unit.

5. The method according to claim 4 ,
wherein the associated clamping unit comprises at least one screw that traverses the pressure tool and the conical extension, the repair patch, the polytetrafluorethylene tape and the composite component.

6. The method according to claim 4 ,
wherein the step of attaching the pressure tool to the composite component comprises at least the steps of:
if an opposite component that is to be mounted to the composite component is not already arranged on a surface of the composite component that is opposed to a surface where the repair patch is arranged, arranging the opposite component on the surface of the composite component that is opposed to the surface where the repair patch is arranged; and
fixing the associated clamping unit at the opposite component.

7. The method according to claim 1 ,
wherein the step of preparing the repair patch comprises preparing a wet laminate repair patch, wherein the step of fixing the repair patch in the inappropriate countersink comprises curing the wet laminate repair patch in the inappropriate countersink.

8. The method according to claim 7 ,
wherein the step of preparing the wet laminate repair patch comprises fabricating the wet laminate repair patch with a basically quasi isotropic layup.

9. The method according to claim 8 ,
wherein fabricating the wet laminate repair patch with the basically quasi isotropic layup comprises stacking of at least three pre-cut fiber fabric layers having 0 °/ 90 °, +/− 45 ° and 0 °/ 90 ° fiber orientations.

10. The method according to claim 1 ,
further comprising at least the step of removing any excessive repair patch portions from the composite component.

11. The method according to claim 10 ,
wherein the step of removing any excessive repair patch portions comprises grinding the composite component at least in the area surrounding the inappropriate countersink.

12. The method according to claim 10 ,
further comprising at least the step of creating an appropriate countersink with appropriate countersink dimensions subsequent to removing any excessive repair patch portions from the composite component.

13. The method according to claim 1 ,
further comprising at least the step of activating the inappropriate countersink prior to arranging the repair patch on the composite component.

14. The method according to claim 1 ,
wherein the step of preparing the repair patch comprises preparing the repair patch with a structure strength that corresponds at least approximately to an underlying structure strength of the composite component.

15. A method of correcting, in a composite component, an inappropriate countersink with an inappropriate maximum diameter and/or depth, the inappropriate countersink being provided in the composite component at a fixation opening having a first opening diameter, the method comprising at least the steps of:
providing a repair patch with a repair patch opening having a second opening diameter that is at most equal to the first opening diameter;
arranging the repair patch on the composite component in an area surrounding the inappropriate countersink, such that the repair patch opening and the fixation opening are at least approximately aligned;
pressing the repair patch at least partly into the inappropriate countersink by an associated pressure tool; and
fixing the repair patch in the inappropriate countersink.

16. The method according to claim 15 ,
further comprising at least the steps of:
preparing a polytetrafluorethylene tape with a polytetrafluorethylene tape opening having a third opening diameter that corresponds at least approximately to the inappropriate maximum diameter of the inappropriate countersink; and
arranging the polytetrafluorethylene tape on the composite component in the area surrounding the inappropriate countersink, prior to arranging the repair patch on the composite component, such that the polytetrafluorethylene tape opening and the fixation opening are at least approximately aligned, wherein the polytetrafluorethylene tape is arranged between the repair patch and the composite component.

17. The method according to claim 16 ,
wherein the step of pressing the repair patch at least partly into the inappropriate countersink comprises at least the steps of:
positioning a conical extension of the pressure tool over the repair patch such that the conical extension is aligned with the inappropriate countersink, wherein the conical extension is provided with dimensions that correspond at least approximately to inverted appropriate countersink dimensions; and
pressing the pressure tool onto the repair patch such that the conical extension presses an inner portion of the repair patch into the inappropriate countersink.

18. The method according to claim 17 ,
further comprising at least the step of attaching, in a releasable manner, the pressure tool to the composite component by an associated clamp.

19. The method according to claim 18 ,
wherein the associated clamp comprises at least one screw that traverses the pressure tool and the conical extension, the repair patch, the polytetraflu

Assignees

• Airbus Helicopters Deutschland GmbH

Inventors

• Joachim Thomas
• Rack Andreas
• LINDENMEIER Josef
• SCHOENICKE Tim

Classifications

• B29C73/06

  using plugs sealing in the hole · CPC title

• B29C73/10

  using patches sealing on the surface of the article (B29C73/14 takes precedence) · CPC title

• B29C73/105 Primary

  provided with a centering element · CPC title

• B29K2027/18

  PTFE, i.e. polytetrafluoroethylene {, e.g. ePTFE, i.e. expanded polytetrafluoroethylene} · CPC title

• B32B37/10

  characterised by the pressing technique, e.g. using action of vacuum or fluid pressure · CPC title