FIELD: plastic working of metals, possibly manufacture of annular blanks.
SUBSTANCE: method comprises steps of placing annular blank into cavity of die; upsetting it and expanding while performing upsetting stage due to creating inside blank hydrostatic pressure of incompressible hydraulic fluid; before placing annular blank, filling cavity of die with incompressible hydraulic fluid. Upsetting of blank and creation of hydrostatic pressure inside it are realized by means of punch. Spindle oil is used as incompressible hydraulic fluid.
EFFECT: improved quality of semi-finished product having no cracking.
3 cl, 1 dwg, 1 tbl, 1 ex
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