Fragmentation projectile and method for its manufacturing
A fragmentation projectile in one aspect has a frontal cavity and defined fragments of medium to high density. The fragments are nearly form fitting together to form a compact projectile until its impact on the target. To achieve these specific mechanical properties, Additive Manufacturing (AM) methods are applied.
1. Process for the production of a fragmentation projectile partially comprising defined nearly form fitting segments, having connecting spots between consecutive longitudinally and/or radially oriented segments, wherein the connecting spots are formed due to the consecutive and/or radially oriented segments contacting each other, wherein said segments and spots are produced by additive manufacturing (AM), so that the segments are nearly form fitting with a maximum distance between adjacent segments of 100 μm and partly material fitting to keep together to form a compact projectile until its impact on the target, and wherein upon the impact on the target the segments are torn apart and spaced over a large area of the target.
2. Process for the production of a fragmentation projectile according to claim 1 , wherein the projectile is produced by “Powder Bed Laser Beam Technology” (LBM) process, whereby crevices are created with the radiation source temporarily switched off for such a length of time that, of the fed or existing metal or ceramic or polymer powder, 1 to 6 grains are not melted or sintered.
3. Process for the production of a fragmentation projectile according to claim 1 , wherein the projectile is produced by “Powder Bed Laser Beam Technology” (LBM) process, with a grain size of 53 μm to 99%, consisting of Cu 77.0%, Ni 14.7%, Sn 6.8% and P 1.5% (percent by weight).
4. Process for the production of a fragmentation projectile according to claim 1 , wherein the projectile is produced on the basis of “Direct Metal Deposition” (DMD) with “Multipowder Feeder” and/or by “Laser Powder-Spray Manufacturing” (LPM).
5. Process for the production of a fragmentation projectile according to claim 1 , wherein, prior to its fitting into a cartridge, the projectile is smoothened by grinding and/or barrel finishing.
6. Fragmentation projectile produced by additive manufacturing (AM) according to claim 1 , with defined nearly form fitting segments, wherein consecutive segments are nearly form fitting with crevices ranging from 3 μm to 100 μm and with partially material fitting connecting spots form a compact projectile until its impact on the target.
7. Fragmentation projectile produced by additive manufacturing (AM) according to claim 6 , further comprising a frontal cavity and spots between defined segments and in the frontal cavity, whereby the segments are nearly form fitting together to form a compact projectile until its impact on the target.
8. Fragmentation projectile produced by additive manufacturing (AM) according to claim 7 , wherein the cavity has at least in its front area the shape of an equilateral triangle.
9. Fragmentation projectile produced by additive manufacturing (AM) according to claim 7 , wherein the cavity is at least in one front segment of spiral shape in opposite direction of the projectile's twist.
10. Fragmentation projectile produced by additive manufacturing (AM) according to claim 7 , wherein the frontal cavity features a maximum aperture amounting to 0.2-times of the projectile's caliber.
11. Fragmentation projectile produced by additive manufacturing (AM) according to claim 6 , wherein the segments comprise brass or bronze and/or a lead-free alloy of both.
12. Fragmentation projectile produced by additive manufacturing (AM) according to claim 6 , wherein the segments extend around a dart of tungsten or wherein central segments are of tungsten and/or an alloy thereof.
13. Fragmentation projectile produced by additive manufacturing (AM) according to claim 6 , wherein the projectile comprises a steel alloy and wherein its surface is coated.
14. Fragmentation projectile produced by additive manufacturing (AM) according to claim 13 , wherein the coating comprises tin, copper or an alloy thereof.
15. Fragmentation projectile produced by additive manufacturing (AM) according to claim 6 , wherein the segments form a frame of at least two parts which frame remains connected until the impact on the target and which features a decreasing resistance to fracture towards the tip.
16. Fragmentation projectile produced by additive manufacturing (AM) according to claim 6 , wherein at least a part of the segments comprises a composite material.
17. Fragmentation projectile produced by additive manufacturing (AM) according to claim 16 , wherein the composite material contains ceramics and/or polymers.
18. Fragmentation projectile produced by additive manufacturing (AM) according to claim 7 , wherein in the cavity the tip of a dart projectile is located.
19. Pistol ammunition comprising a projectile according to claim 6 .
20. Police ammunition comprising a projectile according to claim 6 .
21. Military small-caliber ammunition comprising a projectile according to claim 6 .
22. Ammunition for hunting purposes comprising a projectile according to claim 6 .
23. Mortar or artillery ammunition comprising a projectile according to claim 6 .
24. Ammunition for underwater targets comprising a projectile according to claim 18 .