FIELD: process engineering.
SUBSTANCE: invention relates to metal forming and may be used for production of gas turbine engine discs. Blank is pierced and rolled at mandrel. To define blank diameter and height before piercing, hollow forging step weight is determined with machining allowances. Then, sizes of stepped blank are calculated for rolling at mandrel with due allowance for weight of every stage. Then, maximum, bottom and top diameters are determined as well as pierced blank height. Said pierced stepped blank is transformed for rolling to preset sizes by smoothing blank outlines. Blank diameter and height is determined for piercing by relationships given herein.
EFFECT: decreased metal input.
3 dwg, 1 ex
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