Method for manufacture of a metal shell, and a cup designed to serve as a blank

摘要

The invention relates to manufacture of a cup ( 1 ) that is designed to serve as a blank in the production of a metal shell ( 2 ) by providing a body ( 3 ) of a bar material, placing the body ( 3 ) in a counterdie ( 6 ) in which a first end surface of the body ( 3 ), which is substantially perpendicular to the central axis (C) of the body, is placed facing towards the bottom of the counterdie while the inner wall of the counterdie ( 6 ) encloses at least a part of the body and preferably the whole body, so that the body ( 3 ) is hereby placed in the counterdie ( 6 ), applying a mandrel ( 9 ) to a second end surface of the body that is substantially perpendicular to the central axis C of the body ( 3 ), applying a pressing force to the mandrel ( 9 ) so that the body ( 3 ) is cold flow pressed through plastic deformation into a cup ( 1 ). The invention also relates to an application of a body for manufacture of a blank for a grenade/cartridge shell and a process for manufacture of a grenade/cartridge shell.