GB469550A - Improved method of and apparatus for producing ammunition shell and like cases - Google Patents

Abstract

469,550. Forging and squirting cases for shells. STEWART & CO., Ltd., D., and CROSBIE, J. B. TALBOT-. Dec. 27, 1935, Nos. 35790, 35791, and 35792. [Classes 83 (ii) and 83 (iv)] Billet - piercing ; ,forging - dies.-A hollow case or vessel, such as an ammunition shell case, is formed in a continuous operation consisting in first forming a case having an imperforate end by a forging process, and then completing the operation by an extrusion process. A billet b is supported, resting on an annular die 10, in a container 11, the lower end of the die being closed by a member 13. A plunger 26 carrying a punch 25 descends to force the lower part of the billet into the die 10 and to form a central recess therein by means of the punch 25. The member 13 is then removed and the billet extruded through the die 10, Fig. 5, upon further downward movement of the plunger 26, to produce the case b<1>. The member 13, Fig. 1, may be removed by sliding its supporting bolster 14 laterally to bring a slot 18 therein beneath the member 13. Alternatively, the lower end of the member 13, Fig. 3, rests on a thin plate 20 which is sheared by the edge 13<11> of the member 13 when a predetermined pressure is exceeded. In a further modification, the plug 13 is supported by a plunger of a fluid-pressure-operated ram, which yields at a predetermined pressure. Alternatively, a mechanically operated plunger or a lever system may be operated to release the plug 13 when the fluid-pressure within a cylinder supporting the plug or that operating the punch 26 is observed to exceed a predetermined value. In a mechanical press, the plug may be released when the press head reaches a given point in its operative stroke, or the release may be initiated by the engagement of electric contacts or by collapse of a spring.