GB792754A - Method and apparatus for cold pressing metal products - Google Patents

Abstract

792,754. Forging; shearing; making percussion primers. SCHONDELMAIER, C. March 7, 1956 [March 10, 1955], No. 7088/56. Classes 83 (2) and 83 (4). A metal product 1 having a flattened or profiled web portion 4 is made by cold pressing a rod-shaped blank 6 with a pair of transversely acting die stamps 7, 8 which indent the blank transversely and cause it to stretch longitudinally without producing any substantial increase in diameter thereof. The rod 6 which may be of circular or polygonal cross-section is inserted into a vertical channel 12 and rests upon a solid base 11 thereof, Fig. 7 (not shown). The die 8 is stationary and is mounted in the side wall 13 of the channel. The die 7 is secured to a reciprocating member 14. Both dies have end portions 9, 10 for indenting the blank; the working ends of these portions may be flat or curved or may have steps or recesses therein dependent upon the shape of the web 4 to be formed. The articles are produced in a continuous process and are severed from the rod simultaneously with the next pressing operation, by a fixed shear blade 15 co-operating with a reciprocating shear blade 16, having its forward edge 16<SP>1</SP> embracing the body of the article to be sheared, secured to the member 14. A spring- loaded plunger 17 moves the rod 6 to the left after pressing. The pressed article is preferably used as an intermediate product in the manufacture of percussion primers for projectiles, Figs. 8, 9 (not shown).