Method and tool for producing a base piece of a multi-part cartridge case, base piece and cartridge case

The method, in particular according to one of claims 1 to 3, for producing a base piece (1), in particular formed according to one of claims 15 to 21, for receiving a primer for a multi-part cartridge case (10), in which an extraction groove (9) for engagement by a firearm ejector is produced by deforming in such a way that a primer-side groove flank (29) of the extraction groove (9) is formed by a material displacement directed in the longitudinal direction (L) of the base piece (1) without material being displaced radially outwards.

The method, in particular according to one of the preceding claims, for producing a base piece (1), in particular formed according to one of claims 13 to 18, for receiving a primer for a multi-part cartridge case (10), in which an extraction groove (9) for engagement by a firearm ejector is produced by deforming and without a machining post-processing operation.

A tool arrangement (100) for introducing an extraction groove (9) for engagement by a firearm ejector into a case blank (43) for producing a base piece (1), formed in particular according to one of claims 13 to 21, for receiving a primer for a multi-part cartridge case (10), comprising a die (61, 77) for fixing a face side (55) of the case blank (43) and for engaging in a case cavity (41) of the case blank (43) and a case-shaped press plunger (63, 79) for circumferentially engaging around the case blank (43), wherein the press plunger (63, 79) is movable, in particular purely axially relative to the die (61, 77), for the deforming producing of the extraction groove (9).

The tool arrangement (100), in particular according to one of claims 9 to 10, for introducing an extraction groove (9) for engagement by a firearm ejector into a case blank (43) for producing a base piece (1), in particular formed according to one of claims 13 to 21, for receiving a primer for a multi-part cartridge case (10), comprising a die (61, 77) for fixing a face side (55) of the case blank (43) and for engaging in a case cavity (41) of the case blank (43) and a press plunger (63, 79) for engaging around the outside of the case blank (43), wherein the press plunger (63, 79) has a material displacement projection (69, 83) on its inner side (67, 81) facing the case blank (43), by means of which, during a particularly strictly axial pressing movement of the press plunger (63, 79) relative to the die (61, 77), the tool arrangement (100) forms a primer-side groove flank (28, 29) of the extraction groove (8, 9) for engagement by a firearm ejector.