METHOD FOR MAKING PARTS WITH POLYHEDRAL CROSS SECTION Russian patent published in 2003 - IPC

FIELD: manufacture of parts by cold upsetting, namely production of polyhedral fastening parts. SUBSTANCE: method comprises steps of upsetting round cross section semifinished product and forming polyhedron by reducing it; at upsetting round cross section semifinished product, forming cone protrusion on its end; forming polyhedron by reducing and remaining round cross section collar in base of polyhedron; upsetting the last in closed impression of die set. EFFECT: enhanced quality of parts, improved strength of shaping tools. 4 cl, 1 dwg