FIELD: plastic working of metals, possibly manufacture of forged pieces with central opening.
SUBSTANCE: method comprises steps of upsetting heated initial blank; forming semi-finished product having bridge in zone of one end of its inner portion in die set without forming burr; remaining part of end surface having no contact with tool; then performing final forming, mainly in one half of open die set at displacing outer burr and with possibility of displacing inner burr; removing bridge and trimming burrs.
EFFECT: lowered metal and energy consumption at process.
20 cl, 6 dwg, 1 ex
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