FIELD: process engineering.
SUBSTANCE: invention relates to metal forming. Proposed die comprises top and bottom halves, swaging site, blocker and finishing impression. Both blocker and finishing impression are closed and provided with compensators. Said blocker features height exceeding the of finishing impression by h=5.9-0.04,(Dout1 -Din2), where h is excess height of blocker in every die half; Dout1 is diameter of circle inscribed along outer contour of bed contour for finishing impression ribs; D in2 is diameter of circle inscribed in contour of bed for ribs. Blocker zone for rib crests is shaped to radius equal to 
where R is blocker section spherical radius in said zone.
EFFECT: decreased metal input, higher durability.
4 dwg
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