Bullet, method of manufacturing a bullet, punch for manufacturing a bullet, and method of rotationally securing a bullet core with respect to a bullet jacket of a bullet

Abstract

Summary

The present invention relates to a bullet, in particular precision bullet, comprising a bullet core with a bow-side section, a tail-side section with a bullet base and a guide band located therebetween, and a bullet jacket completely surrounding the bullet core, wherein in the region of the bullet core tail axially offset from the guide band and/or in the region of a tail-side end face of the bullet core base and/or in the region of the bullet core bow axially offset from the guide band a profiling is placed, in accordance with the bullet jacket, adapts complementary in shape in in such a way that an anti-rotation structure is formed between the bullet jacket and the bullet core.

Claims

1. Bullet comprising a bullet core with a bow-side section, a tail-side section with a bullet base and a guide band lying inbetween, and a bullet jacket completely surrounding the bullet core, wherein, in the region of the tail end of the bullet core axially offset from the guide band and/or in the region of a tail end face of the bullet core base and/or in the region of the bullet core bow axially offset from the guide band a profiling is introduced, according to which the bullet jacket adapts complementary in shape in such a way that an anti-rotation structure is formed between the bullet jacket and the bullet core.

2. Bullet according to claim 1, characterized in that the guide band is free of any profiling and/or the profiling comprises a latching element, such as a protrusion and/or a recess, which is associated with a latching element of the bullet jacket base, such as a recess and/or a protrusion, in such a way that the anti-rotation structure is formed.

3. Bullet according to claim 1, characterized in that a depth in the longitudinal direction of the bullet of a latching element at the bullet base lies in the range from 1/10 mm to 10/10 mm, and/or a radial dimension substantially perpendicular to the longitudinal direction of the bullet of a latching element at the circumference of the bullet lies in the range from 20% to 100%, preferably in the range from 40% to 80%, of the diameter of the bullet base and/or lies in the range from 5% to 50% of a wall thickness of the jacket (3) of the bullet.

4. Bullet according to claim 2, characterized in that the latching elements have a cross, star or polygonal shape.

5. Bullet comprising a bullet jacket with an inner surface and a bullet core arranged inside the bullet jacket with a guide band for guiding the bullet core in the bullet jacket, wherein an outer surface of the guide band at least partially lies against the bullet jacket inner surface, wherein at least one of the bullet jacket inner surface and guide band outer surface lying against each other has, at least in some areas, a roughness in the range from 0,0005 mm to preferably 0.5 mm, in particular in the range from 0,005 mm to preferably 0.05 mm, in order to form an anti-rotation structure between the bullet jacket and the bullet core.

6. Bullet according to claim 5, characterized in that both the bullet jacket inner surface and the outer surface of the guide band have, at least in some areas, in particular completely, a roughness in the range from 0,0005 mm to preferably 0.5 mm, in particular in the range from 0,005 mm to preferably 0.05 mm.

7. Bullet according to claim 5, characterized in that the bullet jacket (3) is formed from a metal strip which, at least in some areas, has a roughness in the range from 0.005 mm to preferably 0.05 mm.

8. Bullet comprising a bullet jacket and a bullet core arranged inside the bullet jacket with a guide band) for guiding the bullet core in the bullet jacket, wherein a bullet jacket inner dimension is matched to a guide band outer dimension in such a way that an interference fit, in particular a radial oversize perpendicular to the longitudinal direction of the bullet in the range from 0,0001 mm to preferably 0.1 mm, is realized.

9. Bullet according to claim 8, characterized in that the radial oversize is in the range from 0.001 mm to preferably 0.01 mm.

10. Bullet according to claim 8, characterized in that the bullet is mounted under temperature treatment, preferably the bullet core is mounted under temperature cooling and/or the bullet jacket (3) is mounted under temperature heating with the other.

11. Bullet according to claim 8, characterized in that a bullet jacket inner surface (19) and/or a guide band outer surface are/is profiled in such a way that a leakage flow of a fluid accumulating in the bullet (1) is enabled.

12. Bullet according to claim 11, characterized in that the bullet core has a through bore for the leakage flow, and/or the bullet core is shaped in such a way that at least one guide band outer surface region formed substantially along the complete longitudinal extension of the bullet core is free from contact with the bullet jacket inner surface, wherein in particular the bullet core is segmented and/or polygonal in cross-section.

13. Bullet comprising a bullet jacket and a bullet core arranged inside the bullet jacket with a guide band for guiding the bullet core in the bullet jacket, wherein, in the region of the guide band on the bullet jacket and/or the bullet core, a solidification fluid and/or an additive is applied that increases the coefficient of friction between the bullet jacket and the bullet core, which forms an anti-rotation structure between the bullet jacket and the bullet core.

14. Bullet according to claim 13, characterized in that the solidification fluid is a precipitable solution, for example synthetic oil, bitumen, olive oil, sugar containing liquid or adhesive.

15. Bullet according to claim 13, characterized in that an amount of the solidification fluid is in the range of 2 μl to preferably 6 μl.

16. Bullet according to claim 1, characterized in that the bullet core is pinned with respect to the bullet jacket (3) in the tail region of the bullet, wherein in particular the bullet base having at least two locking pins (57) which project into at least two openings made in the bullet core base end face, wherein in particular the at least two locking pins project into the bullet core by at least 0.2 times to 0.8 times the bullet diameter and/or a diameter of the at least two locking pins corresponds to approximately 0.05 times to 0.2 times, preferably 0.07 times to 0,015 times, the bullet diameter.

17. Bullet according to claim 1, characterized in that the tail region of the bullet jacket (3) is designed to be deformation-soft in such a way that a firing pressure occurring when the bullet is fired deforms the tail region of the bullet jacket (3) at least in sections in such a way that the it adapts to the preferably rigid bullet core in order to form, preferably to reinforce, an anti-rotation structure between the bullet jacket (3) and the bullet core.

18. Bullet according to claim 1, characterized in that the bullet core is joined to the bullet jacket by a friction welding, diffusion welding or spot welding process.

19. Bullet according to claim 1, characterized in that the bullet jacket inner surface and the bullet core outer surface are form-locking engaged with each other by means of a repeating protrusion-recess structure in such a way that a relative rotational mobility between bullet jacket and bullet core is prevented, wherein the protrusion-recess structure comprises at least two protrusions on at least one of the bullet jacket inner surface and the outer surface of the bullet jacket and at least two recesses, in particular of a shape-complementary, on at least the other of the bullet jacket inner surface and the outer surface of the bullet core, wherein the protrusions and the recesses have a radial extent of at least 1/20 and at most ⅕ of the bullet core diameter.

20. Bullet according to claim 1, characterized in that the anti-rotation structure allows relative axial mobility between the bullet jacket (3) and the bullet core.

21. Method of manufacturing a bullet formed according to claim 1.

22. Punch for producing the bullet according to claim 1.

23. Method for rotationally securing a bullet core with respect to a bullet jacket of a bullet according to claim 1, in which at least two locking pins are inserted from the outside into a tail-side bullet base in such a way that the at least two locking pins extend through a bullet jacket end face forming the bullet base and a bullet core base end face facing the bullet jacket end face in order to form an anti-rotation structure.

24. Method according to claim 23, in which, before the insertion of the at least two locking pins in the bullet base, a bore is made in each case for the locking pins, in particular an inside diameter of the bores being dimensioned smaller than an outside diameter of the locking pins and/or the locking pins being pressed in the bores, in particular having a radial oversize with respect to the bores.

Description

[0040] In the following, further properties, features and advantages of the invention will become clear by means of a description of preferred embodiments of the invention with reference to the accompanying exemplary drawings, in which show:

[0041] FIG. 1 a perspective view of a bullet jacket of a bullet according to the invention;

[0042] FIG. 2 a detailed perspective view of a tail section of the bullet jacket according to FIG. 1 as shown by arrow II;

[0043] FIG. 3 a sectional view of the bullet jacket according to FIG. 1;

[0044] FIG. 4 a bottom view of the bullet jacket according to FIGS. 1 to 3;

[0045] FIG. 5 a perspective view of a punch according to the invention;

[0046] FIG. 6 a detailed view of the punch according to FIG. 5;

[0047] FIG. 7 a plan view of the punch according to arrow VII of FIG. 6;

[0048] FIG. 8 a sectional view of the punch according to FIG. 5;

[0049] FIG. 9 a sectional view of a further exemplary design of a bullet jacket of a bullet according to the invention;

[0050] FIG. 10 a schematic plan view of a bullet jacket base according to arrow X in FIG. 9;

[0051] FIG. 11 another exemplary schematic view of a bullet jacket base according to arrow XI of FIG. 9; and

[0052] FIG. 12 a sectional view of a further exemplary embodiment of a bullet jacket of a bullet according to the invention.

[0053] In the following description of exemplary embodiments of a bullet according to the invention, in particular precision bullet, a bullet according to the invention is generally provided with the reference numeral 1, consisting substantially of a bullet jacket 3 and a bullet core arranged within the bullet jacket 3, which is not illustrated for reasons of clarity. As illustrated in the figures, exemplary embodiments of a bullet 1 may also be referred to as precision bullets characterized by an S.sub.a-value of less than 30 mm, preferably less than 20 mm or even less than 15 mm. With the aid of the exemplary embodiments of bullets 1, the measures according to the invention for increasing the transmission of spin force between the bullet jacket 3 and the bullet core (not shown) or for increasing the precision of bullets 1 are described.

[0054] With reference to FIGS. 1 to 4, a first embodiment of a bullet 1 according to the invention is described. FIG. 1 shows a perspective view of the bullet jacket 3, which has an engagement structure 5 for forming a form-locking anti-rotation structure between the bullet jacket 3 and the bullet core. The bullet jacket 3 comprises a bow section 7 extending from a bullet bow 9 to a guide band 11 adjoining the bow section 7 in the longitudinal direction of the bullet. Starting from the guide band 11, the bow section 7 has a cross-section which tapers increasingly towards the bullet tip 9 and whose basic shape is circular. According to FIG. 1, the guide band 11 is shaped as a substantially cylindrical section with a constant outer diameter. Opposite the bow section 7, the guide band 11 opens into a bullet tail section 13 which extends to a bullet base 15 opposite the bullet tip 9. The bullet tail 13 also has a circular cross-section whose outer dimension decreases substantially continuously toward the bullet base 15.

[0055] With reference to FIG. 2, the bullet jacket tail 13 and in particular the engagement structure 5 are shown in more detail, whereby that part of the bullet jacket tail 13 which opens into the bullet jacket base 15 is not shown, in particular has been cut away. As can be seen in particular from a synopsis of FIGS. 1 and 2, the engagement structure 5 is implemented substantially in the region of the bullet jacket tail 13. The engagement structure 5 is formed on a bullet jacket inner surface 19. The engagement structure 5 comprises a plurality of recesses 21 formed on the bullet jacket inner surface 19 and arranged at a continuous distance from each other, distributed circumferentially on the bullet jacket inner surface 19, which recesses extend from the bullet jacket base 15 in the longitudinal direction of the bullet for example along the complete axial extension of the bullet jacket tail section 13.

[0056] FIG. 3 shows a sectional view of the bullet jacket 3. It can be seen that the bullet jacket 3 is open to the surroundings at the bullet tip 9. The bullet jacket 3 comprises a substantially constant wall thickness without limitation in its interior a cavity 23 into which the bullet core (not shown) is to be inserted. In order to implement the anti-rotation structure between the bullet jacket 3 and the bullet core (not shown), the bullet core also has, on an outer surface facing the bullet jacket inner surface 19, an engagement structure which is form-locking with the engagement structure 5 of the bullet jacket 3 in such a way that relative rotational mobility between the bullet jacket 3 and the bullet core is prevented. According to the exemplary embodiment shown in FIG. 3, according to which the engagement structure 5 of the bullet jacket 3 is formed as a repeating recessed structure 21, the engagement structure of the bullet core is shaped as a repeating protrusion structure, the protrusions each form-locking engaging or projecting into a recess 21 of the engagement structure 5.

[0057] In FIG. 4 the engagement structure 5 of the bullet jacket 3 is shown in plan view. In FIG. 4 it is schematically indicated that a radial extension of the depressions 21, as well as also of the protrusions (not shown) of the engagement structure of the bullet core, of at least 1/20 and at most ⅕ of the bullet core diameter possess. The bullet core diameter D may be dimensioned from a bottom 27 of the recess 21 to a bottom 27 of the opposite recess 21, as schematically indicated in FIG. 4.

[0058] With reference to FIGS. 5 to 8, an exemplary embodiment of a punch 25 according to the invention for producing a bullet 1 according to the invention is described, by means of which the bullet 1 according to the invention, or the bullet jacket 3 of a bullet 1 according to the invention, can be produced by means of a deep-drawing process. According to the present invention, other manufacturing processes, in particular tensile pressure forming processes, can also be used to produce the bullet jacket 3 or the bullet 1. The punch 25 comprises a base section 29, which for example is shaped in a rotational form, and an extension section 31, which is arranged coaxially to the base section 29 and which for example is also shaped in a rotational form, such as cylindrical. Towards its end, the extension section 31 opens into a shaping section 33 which, for example, accounts for 25% to 50% of the axial longitudinal extent of the extension section 31. The shaping section 33 comprises a circumferentially provided profiling 35. The circumferential profiling 35 of the shaping section 33 can be manufactured, for example, by means of a solid forming process.

[0059] FIGS. 6 and 7 show the profiling 35 enlarged. The profiling 35 may comprise alternating bump 37 and dimple 39 in the circumferential direction of the shaping section 35, the longitudinal extent of which is equally dimensioned. To form the engagement structure 5 on the bullet jacket 3, the punch 25 is pressed into the inside space 23 of the bullet jacket 3. In particular, the shaping section 33 is pressed against a bullet jacket inner surface 19, for example in the region of the bullet jacket tail section 13. As a result, a negative contour of the profiling 35 can be formed on the bullet jacket inner surface 19, which represents the engagement structure 5 for the bullet core. An axial length of the engagement structure 5 within the bullet jacket 3 can be set via an axial length of the shaping section 33, in particular of the profiling 35. A front end 41, into which the shaping section 33 merges, is formed by a substantially flat surface, which preferably comprises in its center a passage channel 43, which, as can be seen in FIG. 8, extends through the complete longitudinal extent of the punch 25.

[0060] FIG. 7 shows a face view of the front end 41 of the punch 25 as shown by arrow VII of FIG. 6, with the base section 29 omitted. In FIG. 7, the rotational geometry of the profiling 35 and the shaping section 33 can be seen. It can also be seen that the dimple 39 have a larger circumferential dimension than the bump 37, each of which is arranged between two adjacent dimple 39. The radial depth of the engagement structure 5 in the bullet jacket 3 can be adjusted by means of a radial extension b of the bump 37 or dimple 39. According to FIG. 8, it can be seen that the punch is substantially made of solid material and that the passage channel 43 runs in its center of rotation.

[0061] With reference to FIGS. 9 to 12, further exemplary embodiments of a bullet jacket 3 of a bullet 1 according to the invention are described. In order to avoid repetition, substantially only the differences arising with respect to the preceding embodiments will be described below. The bullet jacket 3 according to FIG. 9 differs from the bullet jacket of FIGS. 1 to 4 substantially in that no engagement structure 5 is provided in the region of the bullet jacket tail section 13. In order to form the anti-rotation structure between the bullet jacket 3 and the bullet core, profiling 49 is formed on a tail end face 45 in the inside space 23 of the bullet jacket 3 in accordance with which the bullet core adapts in a complementary manner in such a way that the anti-rotation structure is formed.

[0062] FIGS. 10 and 11 show two exemplary embodiments of a tail end face profiling 49. In both FIG. 10 and FIG. 11, the profiling 49 in the tail end face 45 is formed as a latching element 51, which is associated with a correspondingly formed, preferably a complementary in shape, latching element of the bullet core and can engage with the latter in order to realize a transmission of spin force and thus an anti-rotation structure. In FIG. 10, the latching element 51 is shaped as a star-shaped locking protrusion or star-shaped locking recess 53 which cooperates, for example, with a star-shaped locking recess or locking protrusion on the tail end face of the bullet core base. In FIG. 11, the latching element 51 is realized as a polygonal protrusion 55 or polygonal recess 55, in particular hexagonal recess or hexagonal protrusion, which cooperates with a shape-complementary latching element of the tail end face of the bullet core base to form the anti-rotation structure. Advantageously, a depth of the latching elements 51 in the longitudinal direction of the bullet is in the range of 1/10 mm to 10/10 mm. Furthermore, a radial dimension substantially perpendicular to the longitudinal of the latching elements direction of the bullet should be in the range of 20% to 100%, preferably in the range of 40% to 80% of the bullet base diameter.

[0063] The exemplary embodiment of the bullet jacket 3 according to FIG. 12 differs from the previously described embodiments in that neither an engagement structure 5 according to FIGS. 1 to 4, nor a tail end face profiling 49 according to FIGS. 9 to 11 is provided. In FIG. 12, the bullet core, which is not shown, is pinned with respect to the bullet jacket 3 in the tail section 13 of the bullet 1. The pinned fitting is realized by means of at least two pins 57 which project from the bullet jacket base 15 into the interior 13 in the region of the bullet jacket tail section 13 and engage there in the bullet core. Advantageously, an axial engagement length of the at least two pins 57 in the bullet core in the range of 0.2 times to 0.8 times the bullet diameter is given. Furthermore, a diameter of the at least two pins can correspond to approximately 0.05 times to 0.2 times, preferably 0.07 times to 0,015 times, the bullet diameter.

[0064] The features disclosed in the foregoing description, figures, and claims may be significant, both individually and in any combination, for the realization of the invention in the various embodiments.