BASE PART FOR PRODUCING A CARTRIDGE CASE AND CARTRIDGE CASE, METHOD FOR PRODUCING A BASE PART FOR A CARTRIDGE CASE, AND METHOD FOR PRODUCING A CARTRIDGE CASE

Abstract

A base part intended for producing a cartridge case has a case base for receiving a primer, wherein a peripheral extractor recess is provided on the outer circumference of the base part. To simplify production, the extractor recess has a polygonal geometry that is formed in cross section by a closed traverse.

Claims

1. A base part for producing a cartridge case, the base part comprising: a case base for receiving a primer cap, said case base having a circumferential extractor recess formed therein on an outer circumference of the base part, said circumferential extractor recess having a polygon geometry being formed from a closed traverse in cross section.

2. The base part according to claim 1, wherein at least some paths forming the closed traverse are straight.

3. The base part according to claim 1, wherein at least some paths forming the closed traverse are curved.

4. The base part according to claim 1, wherein the closed traverse is rotationally symmetrical in relation to an axis of rotation.

5. The base part according to claim 1, wherein the closed traverse has a 2n-fold rotational symmetry in relation to an axis of rotation, where n is a number 3.

6. The base part according to claim 1, wherein said case base has an opening formed therein for receiving the primer cap.

7. A cartridge case, comprising: a cylindrical case having a case opening formed therein for receiving a propellant charge and a projectile; and said base part according to claim 1, said base part disposed opposite said case opening.

8. The cartridge case according to claim 7, wherein said cylindrical case and said base part are formed in one piece.

9. The cartridge case according to claim 7, wherein said cylindrical case and said base part are fixedly connected by means of joining technology.

10. A method for producing a cartridge case having a cylindrical case with a case opening formed therein for receiving a propellant charge and a projectile, and also a base part opposite the case opening with a case base for receiving a primer cap, the method comprises the following steps of: supplying a base body for producing the cartridge case; producing a circumferential extractor recess on an outer circumference of the base body in a form of a polygon geometry forming a closed traverse in cross section.

11. The method according to claim 10, wherein the polygon geometry starting from the base body being a cylindrical base body is produced by means of a reshaping method and/or a machining method.

12. The method according to claim 11, which further comprises stamping the polygon geometry into the outer circumference of the base body.

13. The method according to claim 11, which further comprises producing the polygon geometry by means of a plurality of shaping steps.

14. The method according to claim 13, wherein: in a first shaping step, stamping a first polygon geometry into the outer circumference of the base body; and in a second shaping step, stamping a second polygon geometry sectionally overlaying the first polygon geometry into the first polygon geometry.

15. The method according to claim 14, wherein first edges produced in the first shaping step are at least partially over-stamped in the second shaping step.

16. The method according to claim 11, which further comprises using a 2-part or multi-part shaping die to produce the polygon geometry.

17. The method according to claim 14, wherein the base body can be rotated axially by a predetermined angle relative to a shaping die following the first shaping step and before the second shaping step.

18. The method according to claim 14, which further comprises producing the first polygon geometry by means of a first shaping die and the second polygon geometry by means of a second shaping die which is different from the first shaping die.

19. The method according to claim 11, wherein at least one tool is inserted into the base body and/or applied to the outer circumference of the base body during the reshaping method.

20. The method according to claim 19, wherein by means of the at least one tool, holding, indexing, perforating, filling, stamping and/or shaping is applied to the base body.

21. The method according to claim 10, which further comprises producing the polygon geometry starting from a cylindrical base body by means of rolling.

22. The method according to claim 10, which further comprises producing a further opening for receiving the primer cap before, during or after the polygon geometry is produced in the case base.

23. The method according to claim 10, wherein the polygon geometry has a 2n -fold rotational symmetry in relation to an axis of rotation, wherein n is a number≥3.

24. A method for producing a base part for a cartridge case having a case base for receiving a primer cap, the method comprises the following steps of: supplying a base body for producing the base part; and producing a circumferential extractor recess on an outer circumference of the base body in a form of a polygon geometry forming a closed traverse in cross section.

25. The method according to claim 24, wherein the polygon geometry starting from the base body being a cylindrical base body is produced by means of a reshaping method and/or a machining method.

26. The method according to claim 25, which further comprises stamping the polygon geometry into the outer circumference of the base body.

27. The method according to claim 25, which further comprises producing the polygon geometry by means of a plurality of shaping steps.

28. The method according to claim 27, wherein: in a first shaping step, stamping a first polygon geometry into the outer circumference of the base body; and in a second shaping step, stamping a second polygon geometry sectionally overlaying the first polygon geometry into the first polygon geometry.

29. The method according to claim 28, wherein first edges produced in the first shaping step are at least partially over-stamped in the second shaping step.

30. The method according to claim 25, which further comprises using a 2-part or multi-part shaping die to produce the polygon geometry.

31. The method according to claim 28, wherein the base body can be rotated axially by a predetermined angle relative to a shaping die following the first shaping step and before the second shaping step.

32. The method according to claim 28, which further comprises producing the first polygon geometry by means of a first shaping die and the second polygon geometry by means of a second shaping die which is different from the first shaping die.

33. The method according to claim 25, wherein at least one tool is inserted into the base body and/or applied to the outer circumference of the base body during the reshaping method.

34. The method according to claim 33, wherein by means of the at least one tool, holding, indexing, perforating, filling, stamping and/or shaping is applied to the base body.

35. The method according to claim 24, which further comprises producing the polygon geometry starting from a cylindrical base body by means of rolling.

36. The method according to claim 24, which further comprises producing a further opening for receiving the primer cap before, during or after the polygon geometry is produced in the case base.

37. The method according to claim 24, wherein the polygon geometry has a 2n -fold rotational symmetry in relation to an axis of rotation, wherein n is a number≥3.

38. A method for producing a cartridge case having a cylindrical case with a case opening formed therein for receiving a propellant charge and a projectile, and also a base part opposite the case opening having a case bottom for receiving a primer cap, which comprises the following steps of: supplying the base part produced according to claim 24; and preforming the cylindrical case at the base part by means of extrusion.

39. The method according to claim 38, wherein the preforming takes place by means of extrusion and deep-drawing.

40. The method according to claim 38, wherein prior to the preforming of the cylindrical case, at least one tool is inserted into the base part and/or applied to the outer circumference of the base part.

41. The method according to claim 40, wherein by means of the at least one tool, holding, indexing, perforating, filling, stamping and/or forming is applied to the base part and/or the cylindrical case.

42. A method for producing a cartridge case having a cylindrical case with a case opening formed therein for receiving a propellant charge and a projectile, and also a base part opposite the case opening with a case base for receiving a primer cap, which comprises the following steps of: supplying the base part produced according to claim 24; supplying the cylindrical case; and connecting the base part to the cylindrical case by means of a joining method.

43. The method according to claim 42, which further comprises producing the base body and/or the cylindrical case from a non-ferrous metal or steel.

44. The method according to claim 43, which further comprises selecting the non-ferrous metal from the group consisting of brass, aluminum and aluminum alloy.

Description

BRIEF DESCRIPTION OF THE FIGURES

[0055] FIG. 1 is a diagrammatic, perspective view of a base body;

[0056] FIG. 2 is a sectional view according to FIG. 1;

[0057] FIG. 3 is a first sectional view through a first shaping die;

[0058] FIG. 4 is an enlarged view according to FIG. 3;

[0059] FIG. 5 is a second sectional view of the first shaping die according to FIG. 3;

[0060] FIG. 6 is an enlarged sectional view according to FIG. 5;

[0061] FIG. 7 is a perspective view of a first case forming body;

[0062] FIG. 8 is a sectional view according to FIG. 7;

[0063] FIG. 9 is a sectional view through a second shaping die;

[0064] FIG. 10 is an enlarged view according to FIG. 9;

[0065] FIG. 11 is a second sectional view through the second shaping die;

[0066] FIG. 12 is an enlarged sectional view according to FIG. 11,

[0067] FIG. 13 is a side view of the first case forming body according to FIG. 7 with the first shaping die open;

[0068] FIG. 14 is a side view of a second case forming body with the second shaping die open;

[0069] FIG. 15 is a sectional view through a shaping die with the case forming body received therein;

[0070] FIG. 16 is a side view of a second case forming body;

[0071] FIG. 17 is a sectional view according to the cutting line XVII-XVII shown in FIG. 16;

[0072] FIG. 18 is a cross-sectional view according to the cutting line XVIII-XVIII in FIG. 16;

[0073] FIG. 19 is a perspective view according to FIG. 16;

[0074] FIG. 20 is a perspective view of a third case forming body;

[0075] FIG. 21 is a perspective view of a first shaping die in the open state and of a first case forming body;

[0076] FIG. 22 is a perspective view according to FIG. 21, wherein the first shaping die is closed;

[0077] FIG. 23 is a perspective view of a first cavity of the first shaping die;

[0078] FIG. 24 is a perspective view of a second shaping die in the open state and a second case forming body;

[0079] FIG. 25 is a perspective view of the second shaping die in the closed state; and

[0080] FIG. 26 is a perspective, sectional view of a second cavity of the second shaping die in the closed state.

DETAILED DESCRIPTION OF THE INVENTION

[0081] The invention is explained below with the help of a base body for producing a cartridge case. Instead of the base body for producing a cartridge case, a base body for producing the base part can also be supplied and the base part can be produced from this using an analogous method. A base part of this kind can be joined to a case to create a cartridge case.

[0082] Referring now to the figures of the drawings in detail and first, particularly to FIG. 1 thereof, there is shown a perspective view of a base body 1 for producing a cartridge case which is produced in one piece, e.g. by means of extrusion or extrusion and deep drawing. The base body 1 has a cylindrical case 2 which has a case opening 3 and a case base 4 opposite the case opening 3. The case base 4 has an opening 5 for receiving a primer cap (not shown here). A base part is indicated by the dotted line. The base part may be formed from a separate base part T in the case of a multipart embodiment of the cartridge case.

[0083] FIGS. 3 to 6 and 21 to 23 show the production of a first polygon geometry P1 in the region of the case base 4. A first shaping die 6 is made up of two first die halves 6a, 6b in this case. As can be seen from FIGS. 5, 6, 21 and 23, in particular, the first shaping die 6 has a relatively simple design. It has first projections 7 (see FIG. 23) in the region of its first die cavity K1 for stamping a first polygon geometry P1 into the case base 4. The first polygon geometry P1 is a 6-fold rotationally symmetrical polygon geometry in relation to an axis of rotation. A polygon geometry, as shown in cross section in FIGS. 5 and 6, for example, is formed by a closed traverse. The paths are delimited by corners. The paths are straight in this case.

[0084] FIGS. 7, 8 and 13 show a first case forming body F1, i.e. the base body according to the first shaping step. The first polygon geometry P1 stamped into the case base 4 has first polygon faces 10 which are delimited in the circumferential direction by first edges 11 in each case.

[0085] FIGS. 9 to 12 and 24 to 26 show the production of a second polygon geometry P2 in a second shaping step. In order to produce the second polygon geometry P2, the first case forming body F1 is inserted into a second shaping die 8 which may be formed from two second die halves 8a, 8b in a similar way to the first shaping die 6. As can be seen from FIGS. 9 to 12 and 24 to 26, the second shaping die 8 has a second die cavity K2 with second projections 9 (see FIG. 26), which has 6-fold rotational symmetry in relation to an axis of rotation, in order to produce the second polygon geometry P2. The second projections 9 are rotated by approximately 30 degrees in relation to the first projections 7. The first case forming body F1 is inserted into the second shaping die 8 in such a way that first edges 11 of the first polygon geometry P1 are located roughly in the middle of a straight portion of the second projections 9. Consequently, when the second shaping die 8 is closed, the first polygon geometry P1 is over-stamped with a second polygon geometry P2 (see FIG. 12). A second case forming body F2 with a second polygon geometry P2 which has 12-fold rotational symmetry results (see FIGS. 16 to 19). The second polygon geometry P2 has second polygon faces 12 which are delimited in the circumferential direction by second edges 13 (see FIG. 14).

[0086] As indicated by the arrows in FIG. 10, further shaping steps can take place in order to produce a polygon geometry. For this purpose, for example, the second case forming body F2 can be rotated by a predetermined angular amount relative to the second shaping die 8 and subsequently shaped in a third shaping step. In a similar manner, further shaping steps can be carried out.

[0087] FIG. 13 shows the first case forming body F1 with the first shaping die 6 open. FIG. 14 shows, in a similar manner, the second case forming body F2 with the second shaping die 8 open. As can be seen from FIG. 15 in particular, a tool (not shown here) can be introduced into the case 2 and/or the opening 5 during the stamping of the first polygon geometry P1 and/or second polygon geometry P2. A tool (not shown here) can also be applied to the outer circumference of the base body or of the case forming body. In this way, an unwanted reshaping, in particular a folding or the like, within the case 2 and/or the opening 5 can be avoided. The arrows indicate that the tool can act in a holding, filling, stamping or shaping manner. Apart from this, it is also conceivable for the tool to have a perforating or indexing effect.

[0088] FIG. 20 shows a third case forming body F3 which has a third polygon geometry P3. The third polygon geometry P3 may be produced, for example, in that the first polygon geometry P1 is over-stamped with a second polygon geometry P2, which does not coincide with the first polygon geometry P1 and, moreover, is offset by a predetermined angle relative to the first polygon geometry P1.

[0089] The following is a summary list of reference numerals and the corresponding structure used in the above description of the invention.

LIST OF REFERENCE SIGNS

[0090] 1 base body [0091] 2 case [0092] 3 case opening [0093] 4 case base [0094] 5 opening [0095] 6 first shaping die [0096] 6a, 6b first die halves [0097] 7 first projections [0098] 8 second shaping die [0099] 8a, 8b second die halves [0100] 9 second projections [0101] 10 first polygon face [0102] 11 first edge [0103] 12 second polygon face [0104] 13 second edge [0105] T base part [0106] P1 first polygon geometry [0107] P2 second polygon geometry [0108] P3 third polygon geometry [0109] F1 first case forming body [0110] F2 second case forming body [0111] F3 third case forming body [0112] K1 first die cavity [0113] K2 second die cavity