Systems and methods for casting hybrid rocket motor fuel grains

Patent metadata

Field	Value
Publication number	US-9429104-B2
Application number	US-201213564463-A
Country	US
Kind code	B2
Filing date	Aug 1, 2012
Priority date	Aug 1, 2011
Publication date	Aug 30, 2016
Grant date	Aug 30, 2016

Abstract

Embodiments of the invention relate to systems and methods for casting hybrid rocket motor fuel grains. In one embodiment, a method for casting a rocket motor fuel grain can be provided. The method can include providing a positive image of a port made from at least one material. The method can further include disposing at least one fuel material around at least a portion of the positive image of the port. Further, the method can include removing the at least one material, wherein a negative image of the port is formed in the at least one fuel material.

First claim

What is claimed is:

1. A method comprising:
casting a rocket motor fuel grain, the casting method comprising:
providing a rocket motor fuel grain mold cast;
generating a positive image of a port made from at least one material in at least a portion of the rocket motor fuel grain mold cast, wherein a rapid prototyping device is used to generate at least a portion of the positive image; and
disposing within the rocket motor fuel grain cast at least one fuel material around at least a portion of the positive image of the port.

2. The method of claim 1 , wherein the port comprises at least one non-longitudinal feature.

3. The method of claim 1 , wherein the port comprises a thin walled structure incorporating some or all of a helical shape, a concentric disk shape, a series of anteriorially linked disk shapes, or a three-dimensional geometric shape with at least one non-longitudinal feature.

4. The method of claim 1 , wherein the at least one material comprises a soluble polymer.

5. The method of claim 1 , wherein the at least one material comprises an oxidizer.

6. The method of claim 1 , wherein the at least one fuel material comprises a composite solid rocket motor fuel.

7. The method of claim 1 , further comprising:
removing the at least one material making up the positive image of the port, wherein removing the at least one material comprises changing a state of the at least one material.

8. The method of claim 1 , wherein the rocket motor fuel grain mold cast is a shaped cast.

9. The method of claim 1 , further comprising curing the at least one fuel material to form a negative image of the port in the cured fuel material.

10. A method comprising:
casting a rocket motor fuel grain, the casting method comprising:
providing a rocket motor fuel grain mold cast;
providing, in at least a portion of the rocket motor fuel grain mold cast, a positive image of a helical-shaped port made from at least one material comprising an oxidizer, wherein a rapid prototyping device is used to provide at least a portion of the positive image; and
disposing within the rocket motor fuel grain cast at least one fuel material around at least a portion of the positive image of the helical-shaped port.

11. The method of claim 10 , wherein the port further comprises at least one non-longitudinal feature.

12. The method of claim 10 , wherein the at least one material further comprises a soluble polymer.

13. The method of claim 10 , wherein the at least one fuel material comprises a composite solid rocket motor fuel.

14. The method of claim 10 , further comprising:
removing the at least one material making up the positive image of the port from within the at least one fuel material, wherein removing the at least one material comprises changing a state of the at least one material.

15. The method of claim 10 , wherein the rocket motor fuel grain mold cast is a shaped cast.

16. A method comprising:
casting a rocket motor fuel grain, the casting method comprising:
providing a rocket motor fuel grain cast;
generating, in at least a portion of the rocket motor fuel grain mold cast, a positive image of a port made from at least one material comprising a soluble polymer, wherein a rapid prototyping device is used to provide at least a portion of the positive image;
disposing, in the rocket motor fuel grain cast, at least one fuel material around at least a portion of the positive image of the port; and
removing the at least one material by changing a state of the at least one material; and
curing the at least one fuel material to form a negative image of the port in the cured fuel material.

17. The method of claim 16 , wherein the port comprises a thin walled structure incorporating some or all of a helical shape, a concentric disk shape, a series of anteriorially linked disk shapes, or a three-dimensional geometric shape with at least one non-longitudinal feature.

18. The method of claim 16 , wherein the at least one fuel material comprises a composite solid rocket motor fuel.

19. The method of claim 16 , wherein the rocket motor fuel grain mold cast is a shaped cast.

20. The method of claim 16 , wherein the at least one fuel material comprises an oxidizer.

Assignees

• Fuller Jerome Keith
• Aerospace Corp

Inventors

• Fuller Jerome Keith

Classifications

• B33Y50/00

  Data acquisition or data processing for additive manufacturing · CPC title

• F02K9/18 Primary

  of the internal-burning type having a star or like shaped internal cavity · CPC title

• B29C33/52

  soluble or fusible {(in particular used in injection moulding B29C45/4457)} · CPC title

• B21D53/00

  Making other particular articles (making wire fabrics B21F; making chains or chain parts B21L) · CPC title

• C06B45/00

  Compositions or products which are defined by structure or arrangement of component of product (explosive charges of particular form or shape F42B1/00, F42B3/00) · CPC title