Co-cured vacuum-assisted resin transfer molding manufacturing method

• US 20040051214A1
• Filed: 09/13/2002
• Published: 03/18/2004
• Est. Priority Date: 09/13/2002
• Status: Active Grant

• Current Assignee: Northrop Grumman Systems Corporation (Northrop Grumman Corporation)
• Original Assignee: Northrop Grumman Corporation
• Inventors: Shimazu, Denise M., Sheu, Chi Hsien, Kane, David Michael
• Granted Patent: US 7,419,627 B2
• Time in Patent Office: Days
• US Class Current: 264/511
• CPC Class Codes: B29C 70/443 and impregnating by vacuum or injection
• CPC Class Codes: B29D 99/0014 provided with ridges or ribs, e.g. joined ribs

Abstract

According to one embodiment of the invention, a co-cured vacuum-assisted resin transfer molding manufacturing method includes providing a tool base, disposing a prepreg skin panel outwardly from the tool base, disposing one or more tooling details outwardly from the prepreg skin panel, and disposing one or more preforms proximate the one or more tooling details. The one or more preforms are either dry or binderized. The method further includes disposing a high permeability medium between the one or more tooling details and the one or more preforms, enclosing the prepreg skin panel, the one or more tooling details, the one or more preforms, and the high permeability medium with at least one vacuum bag, pulling a vacuum on the vacuum bag, infusing the one or more preforms with a resin, and curing the one or more preforms and the prepreg skin panel.

Claims

1. A co-cured vacuum-assisted resin transfer molding manufacturing method, comprising:

providing a tool base;

disposing a prepreg skin panel outwardly from the tool base;

disposing one or more tooling details outwardly from the prepreg skin panel;

disposing one or more preforms proximate the one or more tooling details, the one or more preforms being either dry or binderized;

disposing a high permeability medium between the one or more tooling details and the one or more preforms;

enclosing the prepreg skin panel, the one or more tooling details, the one or more preforms, and the high permeability medium with at least one vacuum bag;

pulling a vacuum on the vacuum bag;

infusing the one or more preforms with a resin; and

curing the one or more preforms and the prepreg skin panel.

2. The method of claim 1, further comprising removing the high permeability medium after curing the one or more preforms and the prepreg skin panel.

3. The method of claim 1, further comprising disposing a film adhesive between the prepreg skin panel and the one or more preforms.

4. The method of claim 1, further comprising coupling the prepreg skin panel and the one or more preforms with a plurality of fasteners.

5. The method of claim 4, wherein coupling the prepreg skin panel and the one or more preforms with the fasteners comprises coupling the prepreg skin panel and the one or more preforms with a plurality of Z-pins.

6. The method of claim 1, wherein the one or more preforms are selected from the group consisting of a fabric preform, a stitched preform, a warp knit preform, a 3D preform, and a braided preform.

7. The method of claim 1, further comprising vacuum debulking the prepreg skin panel.

8. The method of claim 7, wherein vacuum debulking the prepreg skin panel comprises vacuum debulking the prepreg skin panel at room temperature for a predetermined time during lay-up and then vacuum debulking the prepreg skin panel at an elevated temperature for a predetermined time after lay-up.

9. The method of claim 1, further comprising staging the prepreg skin panel.

10. The method of claim 1, wherein the prepreg skin panel is selected from the group consisting of a hand laid prepreg skin panel, a tape laid prepreg skin panel, a fiber placed prepreg skin panel, and a hybrid skin panel.

11. The method of claim 1, further comprising disposing a release fabric between the high permeability medium and both the prepreg skin panel and the one or more preforms.

12. The method of claim 1, wherein infusing the one or more preforms with the resin comprises heating the resin and vacuum degassing the resin before infusing the one or more preforms with the resin.

13. The method of claim 1, wherein infusing the one or more preforms with the resin further comprises heating the tool base and the one or more tooling details to a predetermined temperature before infusing the one or more preforms with the resin.

14. The method of claim 1, wherein the enclosing, pulling, infusing, and curing steps comprise:

enclosing the prepreg skin panel, the one or more tooling details, the one or more preforms, and the high permeability medium with inner and outer vacuum bags;

pulling a vacuum on the inner and outer vacuum bags;

infusing the one or more preforms with a resin; and

curing the one or more preforms and the prepreg skin panel while maintaining the vacuum on the outer vacuum bag.

15. The method of claim 1, further comprising post-curing the one or more preforms and the prepreg skin panel at an elevated temperature for a predetermined time period.

16. A co-cured vacuum-assisted resin transfer molding manufacturing method, comprising:

providing a tool base;

disposing one or more tooling details outwardly from the tool base;

disposing a high permeability medium outwardly from the one or more tooling details;

disposing one or more preforms proximate the one or more tooling details, the one or more preforms being either dry or binderized;

disposing a prepreg skin panel outwardly from the high permeability medium;

enclosing the one or more tooling details, the high permeability medium, the one or more preforms, and the prepreg skin panel with at least one vacuum bag;

pulling a vacuum on the vacuum bag;

infusing the one or more preforms with a resin; and

curing the one or more preforms and the prepreg skin panel.

17. The method of claim 16, further comprising removing the high permeability medium after curing the one or more preforms and the prepreg skin panel.

18. The method of claim 16, further comprising disposing a film adhesive between the prepreg skin panel and the one or more preforms.

19. The method of claim 16, further comprising coupling the prepreg skin panel and the one or more preforms with a plurality of fasteners.

20. The method of claim 16, wherein coupling the prepreg skin panel and the one or more preforms with the fasteners comprises coupling the prepreg skin panel and the one or more preforms with a plurality of Z-pins.

21. The method of claim 16, wherein the one or more preforms are selected from the group consisting of a fabric preform, a stitched preform, a warp knit preform, a 3D preform, and a braided preform.

22. The method of claim 16, further comprising vacuum debulking the prepreg skin panel.

23. The method of claim 22, wherein vacuum debulking the prepreg skin panel comprises vacuum debulking the prepreg skin panel at room temperature for a predetermined time during lay-up and then vacuum debulking the prepreg skin panel at an elevated temperature for a predetermined time after lay-up.

24. The method of claim 16, further comprising staging the prepreg skin panel.

25. The method of claim 16, wherein the prepreg skin panel is selected from the group consisting of a hand laid prepreg skin panel, a tape laid prepreg skin panel, a fiber placed prepreg skin panel, and a hybrid skin panel.

26. The method of claim 16, further comprising further comprising disposing a release fabric between the high permeability medium and both the prepreg skin panel and the one or more preforms.

27. The method of claim 16, wherein infusing the one or more preforms with the resin comprises heating the resin and vacuum degassing the resin before infusing the one or more preforms with the resin.

28. The method of claim 16, wherein infusing the one or more preforms with the resin further comprises heating the tool base and the one or more tooling details to a predetermined temperature before infusing the one or more preforms with the resin.

29. The method of claim 16, wherein the enclosing, pulling, infusing, and curing steps comprise:

enclosing the prepreg skin panel, the one or more tooling details, the one or more preforms, and the high permeability medium with inner and outer vacuum bags;

pulling a vacuum on the inner and outer vacuum bags;

infusing the one or more preforms with a resin; and

curing the one or more preforms and the prepreg skin panel while maintaining the vacuum on the outer vacuum bag.

30. The method of claim 16, further comprising post-curing the one or more preforms and the prepreg skin panel at an elevated temperature for a predetermined time period.

31. A co-cured vacuum-assisted resin transfer molding manufacturing method, comprising:

providing a prepreg skin panel;

processing the prepreg skin panel, the processing selected from the group consisting of vacuum debulking and staging;

providing a tool base;

disposing the prepreg skin panel outwardly from the tool base;

disposing one or more tooling details outwardly from the prepreg skin panel;

disposing one or more preforms proximate the one or more tooling details, the one or more preforms being either dry or binderized;

disposing a film adhesive between the prepreg skin panel and the one or more preforms;

disposing a high permeability medium outwardly from the one or more tooling details;

disposing a release fabric between the high permeability medium and both the prepreg skin panel and the one or more preforms;

enclosing the prepreg skin panel, the one or more tooling details, the one or more preforms, and the high permeability medium with at least one vacuum bag;

pulling a vacuum on the vacuum bag;

infusing the one or more preforms with a resin; and

curing the one or more preforms and the prepreg skin panel while maintaining the vacuum on the vacuum bag.

32. The method of claim 31, further comprising coupling the prepreg skin panel and the one or more preforms with a plurality of Z-pins.

33. The method of claim 31, wherein the prepreg skin panel is selected from the group consisting of a hand laid prepreg skin panel, a tape laid prepreg skin panel, a fiber placed prepreg skin panel, and a hybrid skin panel.

34. The method of claim 31, wherein the one or more preforms are selected from the group consisting of a fabric preform, a stitched preform, a warp knit preform, a 3D preform, and a braided preform.

35. The method of claim 31, wherein infusing the one or more preforms with the resin comprises heating the resin and vacuum degassing the resin before infusing the one or more preforms with the resin.

36. The method of claim 31, wherein infusing the one or more preforms with the resin further comprises heating the tool base and the one or more tooling details to a predetermined temperature before infusing the one or more preforms with the resin.

37. The method of claim 31, further comprising post-curing the one or more preforms and the prepreg skin panel at an elevated temperature for a predetermined time period.

38. The method of claim 31, wherein the enclosing, pulling, infusing, and curing steps comprise:

enclosing the prepreg skin panel, the one or more tooling details, the one or more preforms, and the high permeability medium with inner and outer vacuum bags;

pulling a vacuum on the inner and outer vacuum bags;

infusing the one or more preforms with a resin; and

curing the one or more preforms and the prepreg skin panel while maintaining the vacuum on the outer vacuum bag.