FIELD: plastic metal working, namely manufacture of bolt blanks. SUBSTANCE: method comprises steps of cutting off initial blank, preliminarily and finally shaping cut blank. Initial blank has diameter no more than 0.89 of nominal thread diameter. Preliminary shaping of bolt head is realized at several operations in such a way that deformation degree of stem at each step of preliminary and final shaping is no more than 18%. EFFECT: enlarged manufacturing possibilities of process, enhanced strength of bolt blanks. 2 cl, 6 dwg
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SU1811954A1 |
