FIELD: plastic metalworking; manufacture of fasteners. SUBSTANCE: proposed method includes upsetting bolt head in form of truncated cone followed by obtaining cylindrical blank having diameter of 1.05-1.08 of circumscribed diameter of shaped head of bolt. Cylindrical blank thus obtained is reduced by length equal to height of bolt head without flange and diameter equal to circumscribed diameter of shaped head of bolt. Then, shaped profile of head is extruded at angle of 60 deg. at final forming position at simultaneous setting up flange. EFFECT: improved quality of articles; enhanced resistance of form-shaping tools. 1 dwg
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Authors
Dates
2003-07-10—Published
2001-08-27—Filed