Sealing and testing segmented tools

• US 10,921,210 B2
• Filed: 12/02/2016
• Issued: 02/16/2021
• Est. Priority Date: 05/31/2013
• Status: Active Grant

• Current Assignee: The Boeing Co.
• Original Assignee: The Boeing Co.
• Inventors: Dull, Kenneth M.
• Primary Examiner(s): Fitzgerald, John
• Assistant Examiner(s): Frank, Rodney T
• Application Number:
  US15/368,367
• Publication Number:
  US 20170074749A1
• Time in Patent Office: 1,537 Days
• Field of Search: 73 37
• CPC Class Codes: B29C 33/0038 with sealing means or the like seals on envelopes used in tyre retreading B29D30/542; for injection moulding footwear B29D35/0045
• CPC Class Codes: B29C 33/485 cores or mandrels collapsible mandrels for shaping tube ends B29C57/02; collapsible mandrels for winding and joining B29C53/824
• CPC Class Codes: B29C 70/44 using isostatic pressure, e.g. pressure difference-moulding, vacuum bag-moulding, autoclave-moulding or expanding rubber-moulding
• CPC Class Codes: F16J 15/02 between relatively-stationary surfaces F16J15/46, F16J15/48 take precedence
• CPC Class Codes: G01M 3/04 by detecting the presence of fluid at the leakage point
• CPC Class Codes: G01M 3/3236 by monitoring the interior space of the containers

Abstract

A substantially air-tight triple seal arrangement along a seam between first and second tool segments comprises inner, middle and outer seals forming first and second substantially air tight vacuum chambers.

Claims

1. A method of sealing between two segments of a mandrel, comprising:

arranging an inner seal, an outer seal, and a middle seal to form first and second seal chambers between the two mandrel segments, wherein the inner, outer and middle seals seal the mandrel segments together;

applying a vacuum to each of the first and second seal chambers; and

sensing a change in vacuum pressure within the first and second seal chambers.

2. The method of claim 1, further comprising:

placing an H-shaped seal area between the two mandrel segments, and connecting legs of the H-shaped seal area to each of the middle and the outer seals.

3. The method of claim 2, further comprising:

placing an inner vacuum bag over the two mandrel segments; and

sealing the inner vacuum bag to the H-shaped seal area.

4. The method of claim 3, further comprising:

placing an outer vacuum bag over the two mandrel segments covering the inner vacuum bag; and

sealing the outer vacuum bag to legs of the H-shaped seal area.

5. The method of claim 4, further comprising:

using the outer vacuum bag to apply pressure to a seal between the inner vacuum bag and the H-shaped seal area.

6. The method of claim 1, wherein the inner seal, middle seal, and outer seal are circumferentially spaced apart from each other.

7. A method of sealing between segments of a mandrel, comprising:

arranging an inner seal, an outer seal, and a middle seal to form first and second seal chambers between a first mandrel segment and a second mandrel segment, wherein the inner, outer and middle seals seal the first mandrel segment and the second mandrel segment together, wherein the first seal chamber is formed between the inner seal and the middle seal, and wherein the second seal chamber is formed between the outer seal and the middle seal;

applying a vacuum to each of the first and second seal chambers; and

sensing a change in vacuum pressure within the first seal chamber or the second seal chamber.

8. The method of claim 7, wherein the inner seal, middle seal, and outer seal are circumferentially spaced apart from each other.

9. The method of claim 7 further comprising detecting a leak in the inner seal by sensing the change in vacuum pressure in the first seal chamber.

10. The method of claim 7 further comprising detecting a leak in the outer seal by sensing the change in vacuum pressure in the second seal chamber.

11. The method of claim 7 further comprising:

placing an H-shaped seal area between the first mandrel segment and the second mandrel segment; and

connecting first legs of the H-shaped seal area to each of the middle and the outer seals.

12. The method of claim 11 further comprising:

placing an inner vacuum bag over the first mandrel segment and the second mandrel segment; and

sealing the inner vacuum bag to the H-shaped seal area.

13. The method of claim 12 further comprising:

placing an outer vacuum bag over the first mandrel segment and the second mandrel segment and covering the inner vacuum bag; and

sealing the outer vacuum bag to second legs of the H-shaped seal area.

14. The method of claim 13 further comprising:

using the outer vacuum bag to apply pressure to a seal between the inner vacuum bag and the H-shaped seal area.

15. The method of claim 7 further comprising:

laying up a composite part on the first mandrel segment and the second mandrel segment.

16. The method of claim 7, wherein at least one vacuum probe senses the change in vacuum pressure within the first seal chamber or the second seal chamber.

17. A method of sealing and testing the integrity of seals between two segments of a mandrel, comprising:

arranging an inner seal, an outer seal, and a middle seal to form first and second seal chambers between the two mandrel segments, wherein the inner, outer and middle seals seal the mandrel segments together;

applying a vacuum to each of the first and second seal chambers; and

detecting a leak in the inner seal or the outer seal by sensing a change in vacuum pressure within the first and second seal chambers.

18. The method of claim 17, wherein the inner seal, middle seal, and outer seal are circumferentially spaced apart from each other.

19. The method of claim 17, wherein detecting the leak in the inner seal or the outer seal comprises detecting a leak in the inner seal by sensing the change in vacuum pressure in the first seal chamber.

20. The method of claim 17, wherein detecting the leak in the inner seal or the outer seal comprises detecting a leak in the outer seal by sensing the change in vacuum pressure in the second seal chamber.