Narrow flake composite fiber material compression molding

Patent metadata

Field	Value
Publication number	US-10919191-B2
Application number	US-201916672021-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, the method comprising:
transforming a unidirectional composite fiber tape into a plurality of narrow flakes, a majority of the plurality of narrow flakes having a length to width aspect ratio of at least 6:1;
pouring the plurality of narrow flakes into a reservoir of a mold in an uncoupled state such that an orientation of the plurality of narrow flakes settling within the reservoir comprises a substantially three-dimensionally random fiber orientation by virtue of the at least 6:1 aspect ratio;
heating the plurality of narrow flakes settled within the reservoir; and
compressing the plurality of narrow flakes settled within the reservoir through the mold to form the composite component, wherein the substantially three-dimensionally random fiber orientation is maintained throughout said heating and compressing steps,
wherein transforming the unidirectional composite fiber tape into the plurality of narrow flakes comprises:
cutting the unidirectional composite fiber tape into a plurality of flakes; and
fracturing the plurality of flakes along a fiber axis thereof to create the plurality of narrow flakes.

2. 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 a majority of the plurality of flakes comprise the aspect ratio of at least 6:1 to create the plurality of narrow flakes.

3. 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% of the plurality of flakes comprise the aspect ratio of at least 6:1 to create the plurality of narrow flakes.

4. 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 2:1.

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

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

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

8. The method of claim 1 , wherein:
the mold reservoir comprises a cavity extending downward from a bottom portion of the mold reservoir, the cavity comprising a first passageway with a turn to a second passageway; and
said compressing results in at least a portion of the narrow flakes being pushed through the cavity and into the first and second passageways.

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

10. The method of claim 1 , wherein the plurality of narrow flakes has a plurality of dimensional attributes.

11. A method of creating a composite component having random three-dimensional fiber orientation, the method comprising:
transforming a unidirectional composite fiber tape into a plurality of narrow flakes, a majority of the plurality of narrow flakes having a length to width aspect ratio of at least 6:1;
pouring the plurality of narrow flakes into a reservoir of a mold in an uncoupled state such that an orientation of the plurality of narrow flakes settling within the reservoir comprises a substantially three-dimensionally random fiber orientation by virtue of the at least 6:1 aspect ratio;
heating the plurality of narrow flakes settled within the reservoir; and
compressing the plurality of narrow flakes settled within the reservoir through the mold to form the composite component, wherein the substantially three-dimensionally random fiber orientation is maintained throughout said heating and compressing steps,
wherein transforming the unidirectional composite fiber tape into the plurality of narrow flakes comprises:
slitting the unidirectional composite fiber tape into a plurality of narrow tape ribbons; and
cutting the plurality of narrow tape ribbons into the plurality of narrow flakes so as to have approximately equivalent dimensional attributes.

12. The method of claim 11 , wherein the aspect ratio comprises 8:1.

13. The method of claim 11 , wherein the plurality of narrow flakes comprises narrow flakes of approximately ½ inches in length and approximately 1/16 inches in width.

14. The method of claim 11 , wherein the unidirectional composite fiber tape comprises a unidirectional thermoplastic tape, the unidirectional thermoplastic tape comprising at least one carbon-fiber reinforced resin of PEKK, PEI, PEEK, PPE, and PPS.

15. The method of claim 11 , wherein:
the mold reservoir comprises a cavity extending downward from a bottom portion of the mold reservoir, the cavity comprising a first passageway with a turn to a second passageway; and
said compressing results in at least a portion of the narrow flakes being pushed through the cavity and into the first and second passageways.

16. A method of creating a composite component having random three-dimensional fiber orientation, the method comprising:
transforming a unidirectional composite fiber tape into a plurality of narrow flakes, a majority of the plurality of narrow flakes having a length to width aspect ratio of at least 6:1;
pouring the plurality of narrow flakes into a reservoir of a mold in an uncoupled state such that an orientation of the plurality of narrow flakes settling within the reservoir comprises a substantially three-dimensionally random fiber orientation by virtue of the at least 6:1 aspect ratio;
heating the plurality of narrow flakes settled within the reservoir; and
compressing the plurality of narrow flakes settled within the reservoir through the mold to form the composite component, wherein the substantially three-dimensionally random fiber orientation is maintained throughout said heating and compressing steps,
wherein transforming the unidirectional composite fiber tape into the plurality of narrow flakes comprises:
slitting the unidirectional composite fiber tape into a plurality of narrow tape ribbons; and
cutting the plurality of narrow tape ribbons into the plurality of narrow flakes so as to have a plurality of dimensional attributes.

17. The method of claim 16 , wherein the aspect ratio comprises 8:1.

18. The method of claim 16 , wherein 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 16 , wherein the unidirectional composite fiber tape comprises a unidirectional thermoplastic tape, the unidirectional thermoplastic tape comprising at least one carbon-fiber reinforced resin of PEKK, PEI, PEEK, PPE, and PPS.

20. The method of claim 16 , wherein:
the mold reservoir comprises a cavity extending downward from a bottom portion of the mold reservoir, the cavity comprising a first passageway with a turn to a second passageway; and
said compressing results in at least a portion of the narrow flakes being pushed through the cavity and into the first and second passageways

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

• Y10T428/24132

  including grain, strips, or filamentary elements in different layers or components parallel · CPC title

• B29C2793/0081

  before shaping · CPC title

• B29C70/545

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