FIELD: process engineering.
SUBSTANCE: invention relates blanking, particularly, to cold forming, namely to rotary forming. Before rotary forming, billet central zone is subjected to local hardening. For this, free running rollers are used to form recesses, their shape and size being defined proceeding from required degree of hardening and billet material properties. Then, said recess are rolled out.
EFFECT: improved mechanical properties.
2 cl, 2 ex, 4 dwg
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