Narrow flake composite fiber material compression molding

Patent metadata

Field	Value
Publication number	US-10919192-B2
Application number	US-201916672133-A
Country	US
Kind code	B2
Filing date	Nov 1, 2019
Priority date	Jan 23, 2012
Publication date	Feb 16, 2021
Grant date	Feb 16, 2021

Abstract

Methods provide for creating a three-dimensional random fiber orientation in a composite component. According to embodiments described herein, narrow flakes are created from a unidirectional composite fiber tape and poured into a reservoir of a mold, creating a three-dimensional random fiber orientation of the narrow flakes within the reservoir. At least a majority of the narrow flakes have an aspect ratio of length to width of at least 6:1. The narrow flakes are heated and compressed to fill the mold and create the composite component. The three-dimensional random fiber orientation of the narrow flakes within the reservoir is maintained as the narrow flakes are pushed through the mold, creating consistent, uniform strength characteristics throughout the resulting composite component.

First claim

What is claimed is:

1. A method of creating a composite component having random three-dimensional fiber orientation therethrough, the method comprising:
cutting a unidirectional composite fiber tape into a plurality of flakes;
fracturing the plurality of flakes along a fiber axis to create a plurality of narrow flakes, wherein a majority of the plurality of narrow flakes has a length to width aspect ratio of at least 6:1;
pouring the plurality of narrow flakes of the unidirectional composite fiber tape into a mold reservoir shaped according to the composite component, wherein each of the plurality of narrow flakes is uncoupled to adjacent ones of the narrow flakes during said pouring, and wherein the plurality of narrow flakes settle randomly in three dimensions by virtue of the aspect ratio of at least 6:1;
heating the plurality of narrow flakes within the mold reservoir; and
compressing the plurality of narrow flakes within the mold reservoir through the mold reservoir to create the composite component, wherein the random three-dimensional orientation is maintained throughout said heating and compressing.

2. The method of claim 1 , wherein:
cutting the unidirectional composite fiber tape into the plurality of flakes comprises cutting the unidirectional composite fiber tape into the plurality of flakes so as to have an aspect ratio of less than 6:1.

3. The method of claim 1 , wherein the unidirectional composite fiber tape comprises a unidirectional thermoplastic tape.

4. The method of claim 1 , wherein fracturing the plurality of flakes along the fiber axis thereof to create the plurality of narrow flakes comprises:
blending the plurality of flakes in a blending device having a plurality of chopping blades until the plurality of narrow flakes have the aspect ratio of at least 6:1.

5. The method of claim 1 , wherein fracturing the plurality of flakes along the fiber axis to create the plurality of narrow flakes comprises:
blending the plurality of flakes in a blending device having a plurality of chopping blades until at least 75% the plurality of narrow flakes have the aspect ratio of at least 6:1.

6. The method of claim 1 , wherein the unidirectional composite fiber tape comprises a unidirectional thermoplastic tape, and the plurality of narrow flakes have approximately equivalent dimensional attributes.

7. The method of claim 1 , wherein the aspect ratio substantially comprises 8:1.

8. The method of claim 7 , wherein the plurality of narrow flakes comprises narrow flakes of approximately ½ inches in length and approximately 1/16 inches in width.

9. The method of claim 1 , wherein an orientation of the plurality of narrow flakes throughout the mold reservoir after said compressing of the plurality of narrow flakes within the mold reservoir comprises a substantially three-dimensionally random fiber orientation.

10. The method of claim 1 , wherein the unidirectional composite fiber tape comprises a unidirectional thermoplastic tape having at least one carbon fiber reinforced resin of PEKK, PEI, PEEK, PPE, and PPS.

11. The method of claim 1 , wherein the plurality of flakes have an aspect ratio of less than 2:1.

12. The method of claim 1 , wherein the plurality of narrow flakes has approximately equivalent dimensional attributes.

13. A method of creating a composite component having random three-dimensional fiber orientation therethrough, the method comprising:
slitting a composite fiber tape into a plurality of narrow tape ribbons;
cutting the plurality of narrow tape ribbons into a plurality of narrow flakes, wherein a majority of the plurality of narrow flakes has a length to width aspect ratio of 6:1 or higher;
pouring the plurality of narrow flakes into a mold reservoir, wherein each of the plurality of narrow flakes is uncoupled to adjacent ones of the narrow flakes during said pouring, and wherein the plurality of narrow flakes settle randomly in three dimensions by virtue of the aspect ratio of 6:1 or higher;
heating the plurality of narrow flakes within the mold reservoir; and
compressing the plurality of narrow flakes within the mold reservoir through the mold reservoir to create the composite component, wherein the random three-dimensional orientation is maintained throughout said heating and compressing steps.

14. The method of claim 13 , wherein the composite fiber tape comprises a unidirectional thermoplastic tape.

15. The method of claim 13 , wherein the plurality of narrow flakes have approximately equivalent dimensional attributes.

16. The method of claim 13 , wherein the plurality of narrow flakes have a plurality of dimensional attributes.

17. The method of claim 13 , wherein the aspect ratio substantially comprises 8:1.

18. The method of claim 17 , wherein the majority of the plurality of narrow flakes comprises narrow flakes of approximately ½ inches in length and approximately 1/16 inches in width.

19. The method of claim 13 , wherein an orientation of the plurality of narrow flakes throughout the mold reservoir after said compressing of the plurality of narrow flakes within the mold reservoir comprises a substantially three-dimensionally random fiber orientation.

20. The method of claim 13 , wherein the composite fiber tape comprises a unidirectional thermoplastic tape having at least one carbon fiber reinforced resin of PEKK, PEI, PEEK, PPE, and PPS.

Assignees

• Boeing Co

Inventors

• Fisher Jr Edward Mcmurray
• Coad Dennis Lynn
• Carter Brian Allen
• Hardin Glenn David
• Thurber Jon Paul
• Bailey Douglas Eugene

Classifications

• B29C70/46 Primary

  using matched moulds, e.g. for deforming sheet moulding compounds [SMC] or prepregs · CPC title

• B29C43/34 Primary

  Feeding the material to the mould or the compression means {(B29C43/085 takes precedence)} · CPC title

• B29C70/545

  Perforating, cutting or machining during or after moulding · CPC title

• B29C31/08

  of preforms {to be moulded, e.g. tablets, fibre reinforced preforms, extruded ribbons, tubes or profiles; Manipulating means specially adapted for feeding preforms, e.g. supports conveyors (B29C31/066, B29C37/001, B29C43/085 take precedence)} · CPC title

• B29C70/18 Primary

  in the form of a mat, e.g. sheet moulding compound [SMC] · CPC title