FIELD: plastic metal working, namely manufacture of bolts with polyhedral head by cold die forging.
SUBSTANCE: method comprises steps of forming cylindrical head; reducing polyhedron in part of height of cylindrical head; finally forming polyhedral head; making outer chamfer on it and shaping rod. Cylindrical head is made by upsetting in first shaping position with diameter consisting 0.94 ч 0.98 of size for wrench of polyhedron of ready article. Polyhedron is reduced along part of height of cylindrical head in second shaping position with size for wrench consisting 0.80 ч 0.86 of size for wrench of polyhedron of ready article. In third position polyhedron is upset for forming small recess in its end. In last position polyhedral head is calibrated for defining outer chamfer.
EFFECT: lowered material consumption, high quality of products, enhanced strength of forging tool.
3 cl, 1 dwg
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