Precision forged cartridge case
An improved cartridge case completely produced net shape on a progressive cold former that includes a trim to lengthy station with an internal shearing tool.
1. A method of making a cartridge case on a single progressive forming machine comprising cold forming an elongated round wire blank with tools that increase its diameter and form holes on each of its ends and an intermediate web between the holes, drawing a part of the blank having one of the holes into a thin wall to form a cavity for eventually receiving a charge and a bullet, trimming a free end of the drawn thin wall while the blank is supported in the machine to obtain a uniform edge and upsetting the blank at the other hole in a segmented die that confines the blank to the finished shape of a cartridge case head including an ejector groove.
2. A method as set forth in claim 1 , wherein the thin wall is forged into a slight taper.
3. A method as set forth in claim 1 , wherein the web is pierced to make a flash hole.
4. A method as set forth in claim 1 , wherein the thin wall is trimmed by a shear operating from the inside of the thin wall.
5. A method as set forth in claim 1 , wherein the blank is cut from coiled wire stock.