FIELD: process engineering.
SUBSTANCE: invention relates to metal forming, particularly, to making thin-wall large-sized special-duty equipment operated at high pressures. Blanks with OD of 278-409 mm are made from 250 mm-dia bars. Said bar is cut to pieces, heated, set at hammer, pierced at both sides and obtained ring of rolled at mandrel. Rolled rings are machined to make 2x30° chamfer and cylindrical lead-in part with butt thrust. Made blank is subjected to rotary drawing by rollers performed at initial steps "in a pass" with increase in lengthwise feed by 15-20% to roller exit from the blank.
EFFECT: higher quality and reliability, lower labor input and costs.
6 dwg
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