Method for consolidating a bulk molding compound

Patent metadata

Field	Value
Publication number	US-12318987-B2
Application number	US-202217662156-A
Country	US
Kind code	B2
Filing date	May 5, 2022
Priority date	May 17, 2018
Publication date	Jun 3, 2025
Grant date	Jun 3, 2025

Abstract

Methods and an apparatus are presented. A bulk molding compound is consolidated by sending the bulk molding compound through a die breaker and an extrusion die of a consolidation system.

First claim

What is claimed is:

1. A method comprising:
consolidating a bulk molding compound by:
loading the bulk molding compound into a compression chamber of a consolidation system, the compression chamber formed between a piston and a die breaker, the piston sealing a first end of the consolidation system, the die breaker separating the compression chamber from a relaxation chamber of the consolidation system, the relaxation chamber formed between the die breaker and an extrusion die connected to a second end of the consolidation system opposite the first end, wherein a plug seals the second end blocking an opening of the extrusion die;
degassing the bulk molding compound by applying a vacuum to the bulk molding compound within the consolidation system and evacuating gases from the compression chamber and the relaxation chamber; and
sending the bulk molding compound through the die breaker and the extrusion die of the consolidation system, the bulk molding compound forcing the plug out of the opening of the extrusion die and maintaining the vacuum within the consolidation system.

2. The method of claim 1 , wherein consolidating the bulk molding compound comprises:
sending the bulk molding compound through the die breaker within the consolidation system; and
extruding the bulk molding compound through the extrusion die of the consolidation system after sending the bulk molding compound through the die breaker.

3. The method of claim 2 , wherein sending the bulk molding compound through the die breaker axially aligns at least a portion of fibers in the bulk molding compound.

4. The method of claim 2 , further comprising:
relaxing the bulk molding compound between sending the bulk molding compound through the die breaker and extruding the bulk molding compound.

5. The method of claim 2 , wherein sending the bulk molding compound through the die breaker comprises compressing the bulk molding compound within a cylindrical housing of the consolidation system using the piston.

6. The method of claim 5 , further comprising:
degassing the bulk molding compound through a vacuum port within the cylindrical housing.

7. The method of claim 5 , further comprising:
heating the cylindrical housing of the consolidation system.

8. The method of claim 2 , wherein sending the bulk molding compound through the die breaker within the consolidation system comprises sending the bulk molding compound through at least one of a plurality of holes or a plurality of slots of the die breaker.

9. The method of claim 8 , wherein sending the bulk molding compound through at least one of the plurality of holes or the plurality of slots consolidates the bulk molding compound.

10. The method of claim 1 , further comprising:
heating the bulk molding compound prior to loading the bulk molding compound into the consolidation system.

11. The method of claim 1 , wherein the bulk molding compound is a loose composite material formed of a resin and fillers.

12. The method of claim 1 , wherein consolidating the bulk molding compound forms a consolidated material, the method further comprising:
forming a composite structure from the consolidated material, wherein the composite structure is a component of an aircraft.

13. The method of claim 12 , wherein the composite structure is a composite radius filler.

14. A method comprising:
heating a bulk molding compound to form a heated bulk molding compound;
loading the heated bulk molding compound into a compression chamber of a consolidation system, the compression chamber formed between a piston and a die breaker, the piston sealing a first end of the consolidation system and the die breaker separating the compression chamber from a relaxation chamber of the consolidation system, the relaxation chamber formed between the die breaker and an extrusion die connected to a second end of the consolidation system opposite the first end, wherein a plug seals the second end blocking an opening of the extrusion die;
degassing the heated bulk molding compound by applying a vacuum to the heated bulk molding compound within the consolidation system and evacuating gases from the compression chamber and the relaxation chamber;
pressing the heated bulk molding compound with the piston through the die breaker and into the relaxation chamber to form a pressed material; and
extruding the pressed material through an extrusion die of the consolidation system, the pressed material forcing the plug out of the opening of the extrusion die and maintaining the vacuum within the consolidation system.

15. The method of claim 14 , further comprising:
heating a cylindrical housing of the consolidation system.

16. The method of claim 14 , further comprising:
degassing the heated bulk molding compound after loading the heated bulk molding compound into the consolidation system.

17. The method of claim 14 , wherein pressing the heated bulk molding compound of the consolidation system to form the pressed material comprises pressing the heated bulk molding compound through the die breaker of the consolidation system, and wherein pressing the heated bulk molding compound through the die breaker of the consolidation system comprises driving the piston towards the extrusion die.

18. The method of claim 17 , wherein pressing the heated bulk molding compound through the die breaker of the consolidation system comprises sending the heated bulk molding compound through at least one of a plurality of holes or a plurality of slots.

19. The method of claim 14 , wherein the bulk molding compound is a loose composite material formed of a resin and fillers.

20. The method of claim 14 , wherein extruding the pressed material through the extrusion die of the consolidation system forms a consolidated material, the method further comprising:
forming a composite structure from the consolidated material, wherein the composite structure is a component of an aircraft.

21. A method comprising:
heating a bulk molding compound to form a heated bulk molding compound;
loading the heated bulk molding compound into a compression chamber of a consolidation system, the compression chamber formed between a piston and a die breaker, the piston sealing a first end of the consolidation system and the die breaker separating the compression chamber from a relaxation chamber of the consolidation system, the relaxation chamber formed between the die breaker and an extrusion die connected to a second end of the consolidation system opposite the first end, wherein a plug seals the second end blocking an opening of the extrusion die;
degassing the heated bulk molding compound by applying a vacuum to the heated bulk molding compound within the consolidation system and evacuating gases from the compression chamber and the relaxation chamber;
consolidating the heated bulk molding compound after degassing, in which consolidating comprises pressing the heated bulk molding compound through the die breaker to form a pressed material by driving the piston towards the extrusion die;
relaxing the pressed material in the relaxation chamber; and
extruding the pressed material through an extrusion die of the consolidation system after relaxing the pressed material, the pressed material forcing the plug out of the opening of the extrusion die and maintaining the vacuum within the consolidation system.

22. The method of claim 21 , wherein pressing the heated bulk molding compound through the die breaker axially aligns at least a portion

Assignees

• Boeing Co

Inventors

• Song Weidong

Classifications

• B29C48/695

  Flow dividers, e.g. breaker plates · CPC title

• B29C48/2886

  of fillers or of fibrous materials, e.g. short-fibre reinforcements · CPC title

• B29K2105/14

  oriented · CPC title

• B29C48/475

  using pistons, accumulators or press rams · CPC title

• B29C48/30

  Extrusion nozzles or dies (extrusion characterised by the shape or cross-section of the extruded article B29C48/03) · CPC title