LIGHTWEIGHT POLYMER AMMUNITION CARTRIDGE CASINGS

摘要

One embodiment of the present invention provides a polymeric ammunition cartridge and methods of making and using the same. The cartridge includes a substantially cylindrical insert connected to a substantially cylindrical polymeric middle body. The substantially cylindrical insert includes a top surface opposite a bottom surface and a substantially cylindrical coupling element that extends from the bottom surface, a primer recess in the top surface that extends toward the bottom surface, a primer flash hole positioned in the primer recess to extend through the bottom surface, and a flange that extends circumferentially about an outer edge of the top surface. The substantially cylindrical polymeric middle body includes a substantially cylindrical polymeric bullet-end and a substantially cylindrical polymeric coupling end connected by a powder chamber, wherein the substantially cylindrical polymeric coupling end extends over the substantially cylindrical coupling element and covers a circumferential surface of the primer flash hole.

主权项

1. A method of making a substantially cylindrical insert by metal injection molding comprising the steps of:
providing a mold of the substantially cylindrical insert to form a substantially cylindrical insert mold; providing a feedstock comprising a powdered metal and a first binding agent and a second binding agent; injection molding the feedstock into the substantially cylindrical insert mold to form an substantially cylindrical insert having a first size; debinding the substantially cylindrical insert to remove the first binding agent; and sintering the substantially cylindrical insert to remove the second binding agent and form a finished substantially cylindrical insert having a second size.