METHOD OF MAKING MULTIHEDRAL FLANGED NUTS WITH HOLLOW CYLINDRICAL NECK Russian patent published in 1998 - IPC

FIELD: plastic metal working, namely manufacture of flanged nuts with hollow cylindrical neck. SUBSTANCE: method comprises steps of cutting round blank, matching its ends in first position, pressing out flange and punching hole, pressing out hollow cylindrical neck in second position and simultaneously making cylindrical portion at side of opposite end of blank, transferring blank by parallel way to next position for pressing out multihedron. Then blank is transferred by parallel way to further position for pressing out flange and applying marks for punching holes at side of ends of multihedron and cylindrical neck. Blank is transferred to final position at rotating it by 180 degrees for punching holes for thread. EFFECT: enhanced quality of parts due to guaranteed filling of hexahedron along diameter of described circle, elimination of flange cracking, increased strength of tool. 1 dwg