FIELD: process engineering.
SUBSTANCE: extrudes rod is heated to temperature exceeding that of vitrification temperature to bend it into ring structure at temperature higher than that of vitrification. Then, first and second ends are jointed together to anneal half-finished ring.
EFFECT: large-diameter seal rings from extruded rods of selected materials.
19 cl, 6 dwg, 10 tbl, 9 ex
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