FIELD: plastic working of metals, possibly manufacture of flush-headed bolts with riffled rod and head with flat in cold upsetting automatic machine.
SUBSTANCE: method comprises steps of reducing rod for forming thread in first position; preliminarily shaping head at forming flat in second position; finally forming head and flat in next position; forming riffles on smooth portion of rod and knurling thread.
EFFECT: manufacture of the whole flush-headed bolt in the same equipment according to advanced fin-free procedure of upsetting without cutting off part of bolt head.
1 dwg
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