FLAWLESS FORGED PIECES FORGING METHOD FOR PRODUCING ELONGATED ARTICLES SUCH AS ROTORS OR SHAFTS Russian patent published in 2007 - IPC B21J1/02 B21K1/06 

FIELD: plastic working of metals, possibly manufacture of forged pieces of elongated articles such as rotors or shafts.

SUBSTANCE: method comprises steps of upsetting block prepared from cast forging ingot; removing out of upset block its central flaw zone by piercing it with use of hollow broach whose diameter is equal at least to 200 mm; subjecting pierced block to intermediate heat treatment; then mechanically working its inner and end surfaces and sealing its central cavity by electroslag refining of electrode; selecting material of electrode according to predetermined level of properties of central zone of article; then forging block to desired size and performing preliminary and final heat treatment of it.

EFFECT: improved metallurgical quality, lowered cost price of forged pieces.

2 cl, 6 dwg, 2 tbl