FIELD: metal forming.
SUBSTANCE: invention relates to metal forming and may be used for production of inserted bolts at the cold-swing automatic devices, which contain rod with corrugations and head with flat. After the blank is cut, the rod is calibrated and reduced for thread rolling. Then head is formed in two stages. At the first stage, the head is pre-set; after that, head with flat is finally formed by cutting. After thread rolling, the ridges are made on the smooth part of the rod.
EFFECT: as a result, higher durability of tool used in forming head, and quality of finished article.
1 cl, 1 dwg
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