FIELD: plastic working of metals. SUBSTANCE: method involves upsetting cylindrical head having outer beveled edge and cylindrical neck, with cylindrical head having diameter making 1.13 the minimal size of key opening and height making 0.75-0.85 of final height of bolt head; after upsetting, reducing part of bolt head to obtain final configuration and sizes and required height of bolt head; cutting unreduced cylindrical part of head in punch or in die in accordance with final sizes and configuration. EFFECT: reduced metal consumption and increased strength of stamped part. 3 cl, 1 dwg
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Authors
Dates
2002-10-20—Published
2001-05-22—Filed