Composite article with fly-away bag carrier

Patent metadata

Field	Value
Publication number	US-11034431-B2
Application number	US-201715714344-A
Country	US
Kind code	B2
Filing date	Sep 25, 2017
Priority date	Sep 25, 2017
Publication date	Jun 15, 2021
Grant date	Jun 15, 2021

Abstract

Provided is a method for forming a co-cured composite article. The method includes: providing a bag carrier; providing a vacuum bag, wherein the vacuum bag at least partially surrounds the bag carrier; providing an outer skin, wherein the outer skin at least partially surrounds the vacuum bag; forming a space between the bag carrier and the outer skin; and providing a filler between the outer skin and the bag carrier.

First claim

What is claimed is:

1. A method for forming a co-cured composite article, comprising:
positioning a vacuum bag at least partially around a bag carrier;
positioning an outer skin at least partially around the vacuum bag;
evacuating a first gas from the vacuum bag to generate an internal compaction pressure against the bag carrier, wherein the internal compaction pressure forms a space between the bag carrier and the outer skin;
curing the outer skin while the bag carrier is under the internal compaction pressure;
introducing a second gas into the vacuum bag after the outer skin is cured;
at least partially removing the vacuum bag from between the bag carrier and the outer skin after the second gas is introduced into the vacuum bag; and
introducing a filler into the space after the vacuum bag is at least partially removed.

2. The method of claim 1 , wherein the providing of the filler comprises at least partially filling the space between the bag carrier and the outer skin with the filler.

3. The method of claim 2 , wherein the filler comprises an uncured resin.

4. The method of claim 3 , further comprising at least partially curing the uncured resin in the space to form an at least partially cured resin.

5. The method of claim 4 , wherein the cured resin comprises a thickness of from about 0.02″ to about 1″.

6. The method of claim 2 , wherein the filler material comprises a liquid foam.

7. The method of claim 6 , further comprising solidifying the liquid foam in the space to form a solid foam.

8. The method of claim 7 , wherein a thickness of the solid foam is in a range of from about 10% to about 200% of a thickness of the outer skin.

9. The method of claim 1 , wherein the filler comprises plaster of paris.

10. The method of claim 1 , wherein positioning the outer skin comprises positioning at least one uncured composite layer onto an outer surface of the bag carrier.

11. The method of claim 10 , further comprising at least partially curing the at least one uncured composite layer while the vacuum bag is pressurized.

12. The method of claim 11 , further comprising removing at least a portion of the vacuum bag from between the outer skin and the bag carrier after the vacuum bag is pressurized and before the filler is provided.

13. The method of claim 11 , wherein the bag carrier comprises support structures that are at least partially wrapped by an inner skin.

14. The method of claim 11 , wherein the providing of the bag carrier comprises 3-D printing the bag carrier.

15. The method of claim 11 , further comprising positioning the bag carrier, the vacuum bag, and the outer skin into a mold, wherein the vacuum bag is pressurized while in the mold.

16. The method of claim 11 , wherein positioning the vacuum bag at least partially around the bag carrier comprises positioning the vacuum bag around the bag carrier.

17. A method, comprising:
positioning a vacuum bag around a bag carrier;
positioning an outer skin at least partially around the vacuum bag, wherein the outer skin comprises an uncured composite layer;
positioning the bag carrier, the vacuum bag, and the outer skin at least partially into a mold;
evacuating a first gas from the vacuum bag to generate an internal compaction pressure against the bag carrier, wherein the internal compaction pressure forms a space between the bag carrier and the outer skin while the bag carrier and the outer skin are in the mold;
curing the outer skin while the bag carrier is under the internal compaction pressure;
introducing a second gas into the vacuum bag after the outer skin is cured;
at least partially removing the vacuum bag from between the bag carrier and the outer skin after the second gas is introduced into the vacuum bag; and
introducing a filler into the space after the vacuum bag is at least partially removed.

18. The method of claim 17 , wherein, as the first gas is evacuated from the vacuum bag, a first portion of the vacuum bag appears to collapse, and a second portion of the vacuum bag appears to inflate, and wherein the space is formed between the bag carrier and the outer skin proximate to the second portion of the vacuum bag.

19. The method of claim 18 , wherein the second portion of the vacuum bag presses the outer skin against the mold, which causes the outer skin to conform to a shape of the mold as the outer skin is cured.

20. The method of claim 17 , wherein the filler comprises a foam that is in a liquid state when introduced into the space, and wherein the method further comprises solidifying the filler into a solid state once the filler is in the space, wherein the filler has a thickness that is from about 0.05 inches to about 0.125 inches, and wherein the thickness of the filler in the solid state is from about 50% to about 100% of a thickness of the outer skin.

21. The method of claim 17 , wherein the filler comprises rubber.

22. The method of claim 17 , wherein the filler comprises wax.

23. The method of claim 17 , wherein the filler comprises plastic.

24. The method of claim 17 , wherein the space has a thickness that is less than a thickness of the outer skin.

25. The method of claim 17 , wherein the filler has a thickness that is less than a thickness of the outer skin.

Assignees

• Boeing Co

Inventors

• Stawski Stanley W
• Plass Christopher E

Classifications

• B29C70/443

  and impregnating by vacuum or injection · CPC title

• B33Y80/00

  Products made by additive manufacturing · CPC title

• Y02T50/40

  Weight reduction · CPC title

• B29C66/7212

  characterised by the composition of the fibres · CPC title

• B29C44/1228

  Joining preformed parts by the expanding material · CPC title