Induction curing of cell-based structural arrays

Patent metadata

Field	Value
Publication number	US-11858219-B2
Application number	US-202117455133-A
Country	US
Kind code	B2
Filing date	Nov 16, 2021
Priority date	Jun 29, 2017
Publication date	Jan 2, 2024
Grant date	Jan 2, 2024

Abstract

Adhesive bondlines in a cell-based structural array are thermally cured using tooling blocks inserted into the cells. The tooling blocks have embedded susceptors that are inductively heated by an alternating electromagnetic field generated by an electromagnet.

First claim

What is claimed is:

1. A method of curing adhesive bondlines within cells of a cell-based composite structure, comprising:
installing a susceptor in each of a plurality of tooling blocks;

inserting the plurality of tooling blocks respectively in the cells of the cell-based composite structure;
generating an electromagnetic field;
inductively heating the susceptors using the electromagnetic field; and
thermally curing the adhesive bondlines using heated susceptors,
wherein generating the electromagnetic field includes passing high frequency alternating current through an induction coil,
wherein the plurality tooling blocks are arranged in rows thereof, and inductively heating the susceptors includes:
orienting the induction coil such that the electromagnetic field extends perpendicular to the rows of the tooling blocks, and
coupling the electromagnetic field with the susceptors.

2. A method of curing adhesive bondlines within cells of a cell-based composite structure, comprising:
installing a susceptor in each of a plurality of tooling blocks;

inserting the plurality of tooling blocks respectively in the cells of the cell-based composite structure;
generating an electromagnetic field;
inductively heating the susceptors using the electromagnetic field; and
thermally curing the adhesive bondlines using heated susceptors,
wherein generating the electromagnetic field includes passing high frequency alternating current through an induction coil,
wherein at least certain of the cells contains a heat sensitive component, and inductively heating the susceptors includes avoiding heating of the heat sensitive components by orienting the induction coil such that the electromagnetic field extends parallel to the heat sensitive components.

3. The method of claim 1 , wherein installing the susceptors includes inserting conductive metal elements respectively into the plurality of tooling blocks.

4. The method of claim 1 , wherein installing the susceptors includes wrapping at least one conductive wire around each of the plurality tooling blocks.

5. The method of claim 1 , wherein installing the susceptors includes wrapping at least one conductive wire around each of the plurality tooling blocks, and wherein generating the electromagnetic field includes passing high frequency alternating current through an induction coil including the at least one conductive wire.

6. A method of curing adhesive bondlines within cells of a cell-based composite structure, the method comprising:
installing a susceptor comprising a hollow center, respectively, in each of a plurality of tooling blocks;
inserting the plurality of tooling blocks respectively in the cells of the cell-based composite structure such that an opening of the hollow center faces away from an electromagnet underlying the cells, the electromagnet comprising an induction coil oriented in a plane perpendicular to a length of the susceptor;
generating, using the electromagnet, an electromagnetic field across the cells and parallel to the length of the susceptor; and
inductively heating, using the electromagnetic field, each susceptor and thereby uniformly heating and thermally curing the adhesive bondlines.

7. The method of claim 6 , further comprising;
passing high frequency alternating current through the induction coil; and
limiting heating of each susceptor to a Curie temperature of each susceptor,

wherein the susceptor comprises a shape that comprises a magnetic material having the Curie temperature and the Curie temperature is greater than a cure temperature of a bondline adhesive of the cells of the cell-based composite structure.

8. The method of claim 7 , further comprising:
the plurality of tooling blocks in rows, orienting the induction coil such that the electromagnetic field extends perpendicular to the rows of the plurality of tooling blocks, and
coupling the electromagnetic field with each susceptor.

9. The method of claim 7 , wherein at least certain of the cells contains a heat sensitive component, and inductively heating each susceptor includes avoiding heating of the heat sensitive components by orienting the induction coil such that the electromagnetic field extends parallel to the heat sensitive components.

10. The method of claim 6 , wherein installing each susceptor includes inserting conductive metal elements respectively into the plurality of tooling blocks.

11. The method of claim 6 , wherein installing each susceptor includes wrapping at least one conductive wire around each of the plurality tooling blocks.

12. The method of claim 6 , wherein installing the susceptors includes wrapping at least one conductive wire around each of the plurality tooling blocks, and wherein generating the electromagnetic field includes passing high frequency alternating current through an induction coil including the at least one conductive wire.

13. A method of curing adhesive bondlines within cells of a cell-based composite structure, the method comprising:
installing a susceptor comprising a hollow center, respectively, in each of a plurality of tooling blocks, each tooling block of the plurality of tooling blocks comprising a susceptor and an upper extension that is configured to facilitate installation and removal of the tooling blocks from the cell-based composite structure;
inserting the plurality of tooling blocks respectively in the cells of the cell-based composite structure using the susceptor and the upper extension such that an opening of the hollow center faces away from an electromagnet underlying the cells, the electromagnet comprising an induction coil oriented in a plane perpendicular to a length of the susceptor;
generating, using the electromagnet, an electromagnetic field across the cells and parallel to the length of the susceptor; and
inductively heating, using the electromagnetic field, each susceptor and thereby uniformly heating and thermally curing the adhesive bondlines.

14. The method of claim 13 , further comprising;
passing high frequency alternating current through the induction coil; and
limiting heating of each susceptor to a Curie temperature of each susceptor,

wherein the susceptor comprises a shape that comprises a magnetic material having the Curie temperature and the Curie temperature is greater than a cure temperature of a bondline adhesive of the cells of the cell-based composite structure.

15. The method of claim 14 , further comprising:
the plurality of tooling blocks in rows, orienting the induction coil such that the electromagnetic field extends perpendicular to the rows of the plurality of tooling blocks, and
coupling the electromagnetic field with each susceptor.

16. The method of claim 14 , wherein at least certain of the cells contains a heat sensitive component, and inductively heating each susceptor includes avoiding heating of the heat sensitive components by orienting the induction coil such that the electromagnetic field extends parallel to the heat sensitive components.

17. The method of claim 13 , wherein installing each susceptor includes inserting conductive metal elements respectively into the plurality of tooling blocks.

18. The method of claim 13 , wherein installing each susceptor includes wrapping at least one conductive wire around each of the plurality tooling blocks.

19. The method of claim 13 , wherein installing the susceptors includes wrapping at least one conductive wire around each of the plurality tooling blocks, and wherein generating the elect

Assignees

• Boeing Co

Inventors

• Hafenrichter Joseph Lawrence
• Marshall Joseph A
• Georgeson Gary Earnest
• Banks David L
• Miller Robert James
• Mori Paul B

Classifications

• B29C65/3604 Primary

  characterised by the type of elements heated by induction which remain in the joint · CPC title

• B29C35/08 Primary

  by wave energy or particle radiation {(B29C64/00, B29C71/04 take precedence)} · CPC title

• B29C35/0805

  using electromagnetic radiation · CPC title

• B29C65/14

  using wave energy {, i.e. electromagnetic radiation,} or particle radiation {(using mechanical waves B29C65/06; using ultrasonic waves B29C65/08; pressing means transparent to electromagnetic radiation B29C66/81267)} · CPC title

• B29C65/32

  Induction · CPC title