Device for control of fragment discharge from main charge liners

• US 20060180045A1
• Filed: 06/09/2004
• Published: 08/17/2006
• Est. Priority Date: 06/11/2003
• Status: Active Grant

• Current Assignee: BAE Systems Hã¤Gglunds AB
• Original Assignee: BAE Systems Hã¤Gglunds AB
• Inventors: Thuman, Christer, Ronn, Torsten, Freij, Peter
• Granted Patent: US 7,658,150 B2
• Time in Patent Office: Days
• US Class Current: 102/492
• CPC Class Codes: F42B 1/02 Shaped or hollow charges blasting cartridges with cavities in the charge F42B3/08; oil winning using shaped-charge perforators E21B43/116

Abstract

The material or fragment discharge is controlled by means of a device (4) in connection to the triggering, preferably by means if an initiation charge (5), of the main charge (3) in the ammunition unit (1). The liner is devised as being exposable for effect from the explosive charge or charges (6) that are devised as being able to be initiate able upon or shortly prior to the triggering of the main charge. The explosive charge achieves, upon initiation a pre-deformation of the liner (4) prior to the liner being affected by the triggering of the main charge for said material or fragment discharge The fragment forms can be rendered more effective in relation to design solution known by prior art by means of the choice explosive charge form and placement, different fragment forms can obtain among different ammunition units.

Claims

1. A device to control material or fragment discharge from a primary or secondary liner in connection with triggering, by initiation of a main charge of an ammunition unit wherein the liner is devised as being exposable for effect from the explosive charge or charges that are devised as being able to be initiated upon or shortly prior to the triggering of the main charge and wherein the explosive charge or charges obtain, upon initiation, a pre-deformation of the liner prior to the liner being affected by the triggering of the main charge for material or fragment discharge.

2. A device in accordance with claim 1, wherein the explosive charge or charges are arranged at the front side of the liner at a periphery of the liner.

3. A device in accordance with claim 1, wherein the explosive charge or charges are arranged at a periphery of the liner with an intermediary barrier.

4. A device in accordance with claim 3, wherein the barrier is made of lead, approximately 1 mm thick, and neoprene, approximately 4 mm thick.

5. A device in accordance with claim 2, wherein each explosive charge is formed with an exterior surface, facing lengthwise to the main charge, and an angled surface, at outer parts of the exterior surface facing a convex surface of the liner, that dilates itself outwards from the convex surface, leaving a central aperture in the ammunition unit'"'"'s direction of flight that dilates outwards like a truncated cone.

6. A device in accordance with claim 2, wherein the divergent fragment or material discharge, resulting from main charge initiation, is given small angles of dispersion within the range of 0.4-9.0°

and low velocities near 540-925 m/s.

7. A device in accordance with claim 3, wherein each explosive charge or charges begin from the exterior circumference of the barrier with parallel interior and exterior surfaces and are arranged with an end surface extending perpendicular to the interior and exterior surfaces and the interior and exterior surfaces allow a central aperture that extends cylindrically from the convex surface of liner in the ammunition unit'"'"'s direction of flight.

8. A device in accordance with claim 3, wherein divergent material or fragment discharge, resulting from the initiation of the main charge, obtains angles of dispersion between 5.0-34°

and velocities within the range of 380-650 m/s.

9. A device in accordance with claim 1, wherein the liner is deformed upon the initiation of the explosive charge or charges in a random manner over given cross sections.

10. A device in accordance with claim 1, wherein concave and convex surfaces of the liner obtain wave forms in given cross sections.

11. A device in accordance with claim 1, wherein the ammunition unit is a missile or a projectile.

12. A device in accordance with claim 3, the divergent fragment or material discharge, resulting from main charge initiation, is given small angles of dispersion within the range of 0.4-9.0°

and low velocities near 540-925 m/s.

13. A device in accordance with claim 4, wherein each explosive charge or charges begin from the exterior circumference of the barrier with parallel interior and exterior surfaces and are arranged with an end surface extending perpendicular to the interior and exterior surfaces and the interior and exterior surfaces allow a central aperture that extends cylindrically from the convex surface of liner in the ammunition unit'"'"'s direction of flight.

14. A device in accordance with claim 4, wherein the divergent material or fragment discharge, resulting from the initiation of the main charge, obtains angles of dispersion between 5.0-34°

and velocities within the range of 380-650 m/s.

15. A device in accordance with claim 7, wherein the divergent material or fragment discharge, resulting from the initiation of the main charge, obtains angles of dispersion between 5.0-34°

and velocities within the range of 380-650 m/s.

16. A device in accordance with claim 2, wherein the liner is deformed upon the initiation of the explosive charge or charges in a random manner over given cross sections.

17. A device in accordance with claim 3, wherein the liner is deformed upon the initiation of the explosive charge or charges in a random manner over given cross sections.

18. A device in accordance with claim 4, wherein the liner is deformed upon the initiation of the explosive charge or charges in a random manner over given cross sections.

19. A device in accordance with claim 2, wherein concave and convex surfaces of the liner obtain wave forms in given cross sections.

20. A device in accordance with claim 3, wherein concave and convex surfaces of the liner obtain wave forms in given cross sections.