Consumable ammunition assembly having a nitroguanidine case and method of making a consumable ammunition assembly having a nitroguanidine case

• US 8,899,155 B2
• Filed: 03/08/2012
• Issued: 12/02/2014
• Est. Priority Date: 03/09/2011
• Status: Active Grant

• Current Assignee: Armtec Defense Products Co. (Transdigm Group Incorporated)
• Original Assignee: Armtec Defense Products Co. (Transdigm Group Incorporated)
• Inventors: Mutascio, Enrico R.
• Primary Examiner(s): BERGIN, JAMES S
• Application Number:
  US13/415,798
• Publication Number:
  US 20120318161A1
• Time in Patent Office: 999 Days
• Field of Search: 102/430, 102/431, 102/432, 102/439, 102/464, 102/465, 102/282
• US Class Current: 102/431
• CPC Class Codes: F42B 5/181 consisting of a combustible casing wall and a metal base; Connectors therefor
• CPC Class Codes: F42B 5/188 Manufacturing processes therefor

Abstract

The present disclosure describes various embodiments of nitroguanidine-based consumable ammunition assemblies and methods of producing and using these assemblies. In one embodiment, for example, a nitroguanidine-based consumable ammunition assembly can include a projectile, a Combustible Cartridge Cased body using nitroguanidine as the primary energetic material, and a composite case base interfacing with the CCC body.

Claims

1. A consumable ammunition assembly, comprising:

a projectile having a leading portion and a trailing portion;

a consumable cartridge body having a first end portion connected to the trailing portion of the projectile, and the body having a second end opposite the first end, wherein the body comprises approximately 55%-70% energetic material, approximately 20%-30% non-energetic structural fibrous material; and

8%-15% additives, and wherein the energetic material comprises approximately 90%-100% nitroguanidine and approximately 0%-10% other energetic material different than nitroguanidine;

a non-combustible base connected to the second end portion of the body and forming a closed bottom of the ammunition assembly; and

a propellant bed contained in the body and intermediate the projectile and the base.

2. The assembly of claim 1 wherein the body is a fully consumable body comprised of approximately 60%-67% energetic material, 25% fibrous material, and 8-15% additives.

3. The assembly of claim 1 wherein the fibrous material comprises abaca hemp fibers or Kraft paper fibers.

4. The assembly of claim 1 wherein the other energetic material comprises nitrocellulose, RDX, or HMX.

5. The assembly of claim 1 wherein the body is a molded body configured to receive the projectile at the first end portion and to connect to the base at the second end portion.

6. The assembly of claim 1 wherein the body is a two piece body having a proximal component adjacent to the projectile and a distal component adjacent to the base.

7. The assembly of claim 6 wherein the proximal component is fixedly interconnected to the distal component at a joint area formed by a skive joint.

8. The assembly of claim 1 wherein the first end portion has engaging features for engaging the projectile, wherein the engaging features comprise hangers, threads, holes, grooves, or notches.

9. The assembly of claim 1, further comprising a structural member disposed within the body and physically interconnecting the projectile and the base to isolate the body from loads therebetween.

10. A consumable ammunition assembly, comprising:

a projectile;

a molded, consumable cartridge body having a first end portion connected to the projectile, and the body having a second end opposite the first end, wherein the body comprises nitroguanidine-based energetic material, and approximately 20%-30% non-energetic, fibrous material, and wherein the energetic material comprises approximately 90%-100% nitroguanidine;

a non-combustible base connected to the second end portion of the body and forming a closed bottom of the ammunition assembly; and

a propellant bed contained in the body and intermediate the projectile and the base.

11. The assembly of claim 10 wherein the body is a fully consumable body comprised of approximately 60%-67% energetic material, and 20%-30% non-energetic, fibrous material.

12. The assembly of claim 10 wherein the non-energetic fibrous material comprises abaca hemp fibers or Kraft paper fibers.

13. The assembly of claim 10 wherein the other energetic material comprises nitrocellulose, RDX, or HMX.

14. The assembly of claim 10 wherein the body is a molded body configured to receive the projectile at the first end portion and to connect to the base at the second end portion.

15. The assembly of claim 10 wherein the body is a two piece body having a proximal component adjacent to the projectile and a distal component adjacent to the base.

16. The assembly of claim 10 wherein the first end portion has engaging features for engaging the projectile, wherein the engaging features comprise hangers, threads, holes, grooves, or notches.

17. The assembly of claim 10, further comprising a structural member disposed within the body and physically interconnecting the projectile and the base to isolate the body from loads therebetween.