Forming reinforcing components

• US 6,355,133 B1
• Filed: 12/17/1999
• Issued: 03/12/2002
• Est. Priority Date: 12/22/1998
• Status: Expired due to Term

• Current Assignee: Airbus Operations Limited (Airbus SE)
• Original Assignee: BAE Systems Plc
• Inventors: Williams, Stephen
• Primary Examiner(s): AFTERGUT, JEFFRY H
• Application Number:
  US09/465,940
• Time in Patent Office: 816 Days
• Field of Search: 156/382, 156/285, 156/286, 156/166, 156/296, 264/257, 264/258
• US Class Current: 156/296
• CPC Class Codes: B29C 70/205 the structure being shaped to form a three-dimensional configuration
• CPC Class Codes: Y02T 50/40 Weight reduction

Abstract

A method of forming a substantially planar, multi-layer, composite article that comprises a plastics materials reinforced with fibers that extend substantially continuously in one direction in the plane of each layer is provided. The majority of the layers are aligned in a main direction B and the article (20a) is disposed over a contoured surface of a forming tool (6). The article (20a) is constrained against movement in a direction perpendicular to the plane of the main direction layers and forces applied to the article (20a) in the plain thereof in a direction substantially perpendicular to the main direction of the fibers. The article (20a) is thereby urged into conformity with the contoured surface of the tool (6) while substantially maintaining the continuity of the fibers.

Claims

1. A method of forming a substantially planar, multi-layer, composite article that comprises a plastics material reinforced with fibres that extend substantially continuously in one direction in the plane of each layer, wherein a majority of the layers are aligned in said one direction, said method comprising the steps of:

disposing said article over a contoured surface of a forming tool,

constraining said article against movement in a direction substantially perpendicular to the plane of said one direction layers,

applying force to the article in the plane thereof, in a direction substantially perpendicular to the said one direction of said fibres, and towards said contoured surface of said forming tool thereby urging the article into conformity with the contoured surface of the tool whilst substantially maintaining the continuity of the said fibres.

2. A method according to claim 1, wherein the constraining of the article is carried out by mounting the article in a flexible support that is reinforced in, or parallel to, the plane of said one direction of the article.

3. A method according to claim 2 wherein the support comprises an elastomeric material reinforced with spaced-apart rigid rods.

4. A method according to claim 2 wherein the support is in the form of a container that receives the planar article.

5. A method according to claim 2 wherein the support is mounted in a rigid frame located around the forming tool and is arranged to guide the article in a direction towards the contoured surface of the forming tool under the action of the said force.

6. A method according to claim 2 wherein the reinforcement is arranged substantially to prevent movement of the article in the said one direction of the said fibres.

7. A method according to claim 1 wherein the force acting on the article is produced by means of a press or a vacuum.

8. A method according to claim 1 wherein subsequent to the said conforming operation, a further forming operation is carried out whereby the article is heated and force is applied thereto such that it is folded about a line in its planar surface that extends substantially parallel to the said one direction of the said fibres.

9. A method according to claim 8 wherein the plastics material comprises a thermoset plastic, and wherein sufficient heat is applied only during the further forming operation to effect curing thereof.

10. A method according to claim 1 wherein the plastics material of the article is curable and is cured after the forming thereof has been completed.

11. A method according to claim 1, wherein the article comprises a carbon- or glass-fibre reinforced plastics material, and is formed as a structural reinforcing member with the said fibres in the one direction aligned in a main load-bearing direction thereof.

12. A method according to claim 1 wherein the contouring of the forming tool is arranged to allow the formed article to conform to a joggle or a ramp.

13. A method according to claim 1 wherein the article is softened by the application of heat prior to applying said force thereto.

14. A method of forming a substantially planar, multi-layer, composite article that comprises a plastics material reinforced with fibres that extend substantially continuously in one direction in the plane of each layer, wherein a majority of the layers are aligned in a main direction, wherein the article is disposed over a contoured surface of a forming tool, wherein the article is constrained against movement in a direction substantially perpendicular to the plane of said main direction layers, wherein force is applied to the article in the plane thereof in a direction substantially perpendicular to the said main direction of said fibres, thereby to urge the article into conformity with the contoured surface of the tool whilst substantially maintaining the continuity of the said fibres, wherein the constraining of the article is carried out by mounting the article in a flexible support that is reinforced in, or parallel to, the plane of said main direction of the article, wherein the support is mounted in a rigid frame located around the forming tool and is arranged to guide the article in a direction towards the contoured surface of the forming tool under the action of the said force.