Modular tooling for manufacturing multi-cavity composite structures

Patent metadata

Field	Value
Publication number	US-10507600-B2
Application number	US-201615264118-A
Country	US
Kind code	B2
Filing date	Sep 13, 2016
Priority date	Sep 14, 2015
Publication date	Dec 17, 2019
Grant date	Dec 17, 2019

Abstract

A method of manufacturing a monolithic component having internal wall(s), including separately placing uncured composite material on a mold parts, placing the mold parts on a support plate with a portion of the uncured composite material extending between and in contact with the adjacent mold parts, interconnecting the adjacent mold parts through a connection allowing limited relative movement on the support plate along a direction corresponding to a thickness of the uncured composite material therebetween, biasing the adjacent mold part toward each other along the limited relative movement to provide a compressive force on the uncured composite material extending therebetween, and curing the composite material to obtain the monolithic component with each internal wall being formed between adjacent mold parts. The bias causes the adjacent mold parts to move toward each other as the thickness of uncured material extending therebetween reduces during curing. A tool assembly is also discussed.

First claim

The invention claimed is:

1. A method of manufacturing a monolithic component having an internal wall, the method comprising:
separately placing uncured composite material on a first mold surface of a first mold part and on a second mold surface of a second mold part;
placing the first and second mold parts adjacent each other on a support plate, the first and second mold surfaces including internal regions facing each other;
attaching the first mold part to the support plate so as to fix a relative position of the first mold part with respect to the support plate, wherein the second mold part is not used to attach the first mold part to the support plate;
interconnecting the first and second mold parts through a direct connection allowing limited movement of the second mold part on the support plate toward the first mold part, a portion of the uncured material extending in contact with the internal regions of the first and second mold parts, the limited movement varying a distance between the internal regions;
biasing the second mold part toward the first mold part along a direction of the limited movement to provide a predetermined compressive force on the portion of the uncured composite material extending between the internal regions; and
curing the composite material by heating the composite material under pressure while maintaining the bias along the direction of the limited movement to obtain the monolithic component, the internal wall being formed between the internal regions.

2. The method according to claim 1 , further comprising, before curing the composite material and after interconnecting the first and second mold parts, placing at least one continuous layer of uncured composite material over the uncured composite material received on the first and second mold surfaces and over the portion of the uncured material received between the internal regions.

3. The method according to claim 1 , further comprising, before curing the composite material:
placing uncured composite material on a third mold surface of a third mold part;
placing the third mold part on the support plate adjacent the second mold part, the second and third mold surfaces including additional internal regions facing each other;
interconnecting the second and third mold parts through an additional direct connection allowing additional limited relative movement on the support plate between the second and third mold parts, an additional portion of the uncured material extending in contact with the additional internal regions, the additional relative movement varying a distance between the additional internal regions;
biasing the second and third mold parts toward each other along a direction of the additional limited movement to provide a predetermined compressive force on the additional portion of the uncured composite material extending between the additional internal regions; and
wherein curing the composite material is performed while also maintaining the bias along the direction of the additional limited movement, an additional internal wall being formed between the additional internal regions.

4. The method according to claim 1 , wherein:
interconnecting the first and second mold parts includes interconnecting the first and second mold parts through a plurality of fasteners received through flanges of the first and second mold parts, and
biasing the first and second mold parts includes biasing the first and second mold parts with at least one spring washer being received on each of the fasteners.

5. The method according to claim 1 , wherein the direction of the relative movement is horizontal.

6. The method according to claim 1 , wherein the portion of uncured composite material includes an assembly of plies of prepreg material having opposed surfaces spaced apart a distance corresponding to a thickness of the assembly of plies, each of the surfaces of the assembly of plies being in contact with a respective one of the internal regions.

7. The method according to claim 1 , wherein the compressive force is at least 80 psi.

8. A method of manufacturing a monolithic component having multiple internal walls, the method comprising:
separately placing uncured composite material on mold surfaces of a plurality of mold parts;
placing the mold parts on a support plate adjacent one another, a portion of the uncured composite material extending between and in contact with each of the mold parts;
interconnecting the mold parts through a connection allowing limited relative movement between the mold parts on the support plate along a direction corresponding to a thickness of the portion of the uncured composite material extending between the mold parts;
applying a biasing force that biases the mold parts toward each other along the direction of limited relative movement to provide a compressive force on the portion of uncured composite material extending between the mold parts; and
curing the composite material by heating the composite material under pressure to obtain the monolithic component having internal walls, the biasing force causing the mold parts to move toward each other as the thickness of the portion of uncured material extending between the mold parts reduces during curing;
wherein the mold parts comprise a reference mold part attached to the support plate without the use of any of the other mold parts.

9. The method according to claim 8 , wherein:
the mold parts comprise a plurality of displaceable mold parts that are interconnected so that each displaceable mold part is connected to the reference mold part, either directly or through connection with another of the displaceable mold parts.

10. The method according to claim 8 , further comprising, before curing the composite material and after interconnecting the mold parts, placing at least one continuous layer of uncured composite material over the uncured composite material extending between the mold parts.

11. The method according to claim 8 , wherein interconnecting the mold parts and applying the biasing force includes interconnecting the mold parts through a plurality of fasteners received through flanges of the mold parts with at least one spring washer being received on each of the fasteners.

12. The method according to claim 8 , wherein the direction of the relative movement is horizontal.

13. The method according to claim 8 , wherein the portion of uncured composite material includes an assembly of plies of prepreg material having opposed surfaces spaced apart a distance corresponding to the thickness of the portion of uncured composite material, each of the opposed surfaces of the assembly of plies of prepreg material being in contact with one of the mold parts.

14. The method according to claim 8 , wherein the compressive force is at least 80 psi.

Assignees

• Bell Helicopter Textron Inc
• Nat Res Council Canada

Inventors

• Gingras Richard
• Roy Steven
• Octeau Marc-André
• Forget Pascal

Classifications

• B29C33/301 Primary

  Modular mould systems [MMS], i.e. moulds built up by stacking mould elements, e.g. plates, blocks, rods (B29C33/0088 takes precedence) · CPC title

• B29L2031/082

  Blades, e.g. for helicopters · CPC title

• B29K2105/0872

  Prepregs · CPC title

• B29C70/342

  using isostatic pressure · CPC title