FIELD: plastic metal working, possibly manufacture of articles such as bolt blanks including bolts with large-size heads. SUBSTANCE: method comprises steps of cutting initial blank, preliminary and final shaping of head at simultaneous upsetting of rod, reducing rod for making thread. Initial blank has diameter no more than 0.98 of nominal diameter of rod. Preliminary upsetting is realized by several stages. Rod reduction for thread making and final upsetting of bolt head are performed by one stage. Deformation degree of rod at preliminary and final shaping of head is no more than 18%. EFFECT: enlarged manufacturing possibilities of method, enhanced strength properties of bolts. 3 cl, 6 dwg, 1 ex
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Authors
Dates
2000-12-27—Published
2000-03-20—Filed