Manufacture of thermoplastic core

Patent metadata

Field	Value
Publication number	US-9840043-B2
Application number	US-201514623822-A
Country	US
Kind code	B2
Filing date	Feb 17, 2015
Priority date	Feb 17, 2015
Publication date	Dec 12, 2017
Grant date	Dec 12, 2017

Abstract

One aspect of a method of manufacturing a honeycomb core includes positioning a first thermoplastic columnar cell adjacent a second thermoplastic columnar cell, modifying a thermoplastic property of the first thermoplastic columnar cell, wherein the modified thermoplastic property permits joining a circumferential surface of the first thermoplastic columnar cell to a circumferential surface of the second thermoplastic columnar cell. The method also includes joining the circumferential surface of the first thermoplastic columnar cell having the modified thermoplastic property to the circumferential surface of the second thermoplastic columnar cell resulting in the honeycomb core.

First claim

What is claimed is:

1. A method of manufacturing a honeycomb core for a structural aircraft component, the method comprising:
positioning a first thermoplastic columnar cell adjacent a second thermoplastic columnar cell;
modifying a thermoplastic property of the first thermoplastic columnar cell, wherein the modified thermoplastic property permits joining a circumferential surface of the first thermoplastic columnar cell to a circumferential surface of the second thermoplastic columnar cell; and
joining the circumferential surface of the first thermoplastic columnar cell having the modified thermoplastic property to the circumferential surface of the second thermoplastic columnar cell resulting in the honeycomb core for the structural aircraft component.

2. The method of claim 1 , wherein modifying the thermoplastic property of the first thermoplastic columnar cell comprises:
identifying a region on the circumferential surface of the first thermoplastic columnar cell, the region encompassing less than an entirety of the circumferential surface of the first thermoplastic columnar cell; and
modifying the thermoplastic property of only the identified region.

3. The method of claim 2 , wherein modifying the circumferential property of only the identified region comprises:
coating the identified region with an agent having an affinity to a property modifier; and
passing the first thermoplastic columnar cell through the property modifier, wherein the property modifier modifies the thermoplastic property of only the identified region.

4. The method of claim 3 , wherein the property modifier is a microwave energy source.

5. The method of claim 1 , further comprising:
positioning a third thermoplastic columnar cell adjacent the honeycomb core;
modifying a thermoplastic property of either the honeycomb core or the third thermoplastic columnar cell, wherein the modified thermoplastic property of either the honeycomb core or the third thermoplastic columnar cell permits joining a circumferential surface of the third thermoplastic columnar cell and a circumferential surface of the honeycomb core to each other; and
joining the circumferential surface of the third thermoplastic columnar cell to the circumferential surface of the honeycomb core.

6. The method of claim 5 , further comprising:
modifying a thermoplastic property of the second thermoplastic columnar cell, wherein the modified thermoplastic property of the second thermoplastic columnar cell permits removing second thermoplastic columnar cell from the honeycomb core; and
removing the second thermoplastic columnar cell from the honeycomb core.

7. The method of claim 1 , further comprising modifying a thermoplastic property of the second thermoplastic columnar cell prior to joining the circumferential surface of the first thermoplastic columnar cell having the modified thermoplastic property to the circumferential surface of the second thermoplastic columnar cell having the modified thermoplastic property.

8. The method of claim 1 , wherein the thermoplastic property of the first thermoplastic columnar cell is a surface temperature of the first thermoplastic columnar cell, and wherein modifying the thermoplastic property of the first thermoplastic columnar cell comprises heating the first thermoplastic columnar cell to increase the surface temperature of the first thermoplastic columnar cell to near a melting point of the first thermoplastic columnar cell.

9. The method of claim 8 , wherein heating the first thermoplastic columnar cell comprises applying at least one of ultrasound, microwaves, infrared radiation or laser radiation to the first thermoplastic columnar cell.

10. The method of claim 8 , wherein heating the first thermoplastic columnar cell comprises passing the first thermoplastic columnar cell through a heating chamber.

11. The method of claim 1 , wherein a property of the first thermoplastic columnar cell is different from a property of the second thermoplastic columnar cell.

12. The method of claim 11 , wherein the property of the first thermoplastic columnar cell comprises at least one of a cross-sectional shape, a cross-sectional size, a wall thickness, or thermoplastic composition of the first thermoplastic columnar cell.

13. The method of claim 11 , wherein the property of the second thermoplastic columnar cell comprises at least one of a cross-sectional shape, a cross-sectional size, a wall thickness, or thermoplastic composition of the second thermoplastic columnar cell.

14. The method of claim 1 , further comprising:
identifying a region in the honeycomb core comprising a defect; and
modifying a thermoplastic property of the region in the honeycomb core to rectify the defect.

15. A method of manufacturing a honeycomb core for a structural aircraft component, the method comprising:
identifying a plurality of thermoplastic columnar cells, wherein a thermoplastic columnar cell in a subset of the plurality of thermoplastic columnar cells comprising at least two thermoplastic columnar cells has a property that is different from a corresponding property of another thermoplastic columnar cell in the subset;
for each of the plurality of thermoplastic columnar cells, modifying a thermoplastic property, wherein modified thermoplastic properties of the plurality of thermoplastic columnar cells enables the plurality of thermoplastic columnar cells to join each other; and
joining the plurality of thermoplastic columnar cells to form the honeycomb core for the structural aircraft component.

16. The method of claim 15 , wherein a property of a thermoplastic columnar cell comprises at least one of a cross-sectional shape, a cross-sectional size, a wall thickness, or thermoplastic composition of the first thermoplastic columnar cell.

17. The method of claim 15 , wherein the subset of the plurality of thermoplastic columnar cells comprises a first thermoplastic columnar cell and a second thermoplastic columnar cell, and wherein a size or a wall thickness of the first thermoplastic columnar cell is different from a size or a wall thickness, respectively, of the second thermoplastic columnar cell.

18. The method of claim 15 , wherein the thermoplastic property is a surface temperature of a thermoplastic columnar cell.

19. The method of claim 18 , wherein modifying the thermoplastic property of the thermoplastic columnar cell comprises heating the thermoplastic columnar cell to increase the surface temperature of the thermoplastic columnar cell to near a melting point of the thermoplastic columnar cell.

20. The method of claim 15 , wherein joining the plurality of thermoplastic columnar cells comprises joining the plurality of thermoplastic columnar cells into a row, and wherein the method further comprises:
forming a first corrugated row of the plurality of thermoplastic columnar cells; and
joining the first corrugated row to a second corrugated row of a plurality of thermoplastic columnar cells by modifying a thermoplastic property of either the first corrugated row or the second corrugated row.

Assignees

• Bell Helicopter Textron Inc

Inventors

• Schulte Elliott Keller
• Brack Robert
• Oldham Kathleen

Classifications

• B29C65/1483

  coated on the article · CPC title

• B29C66/73921

  characterised by the materials of both parts being thermoplastics · CPC title

• B29C66/1122

  Single lap to lap joints, i.e. overlap joints (B29C66/45, B29C66/472, B29C66/52272 take precedence) · CPC title

• B29D99/0089 Primary

  Producing honeycomb structures (consisting of porous ceramic ware C04B38/0006) · CPC title

• B29L2031/3088

  Helicopters · CPC title