FIELD: metallurgy.
SUBSTANCE: roll body has round-cross-section groove with tangential transverse taps. Rolling of large-diameter pipes at minor reduction at anvil swage section is made possible by that the groove composed of working and idle parts, 210 and 150 degrees in length, has working part consisting of consecutive anvil swage parts composed of roll ledge in radius increasing by 85-90 mm, with crosswise tap angle varying over anvil swage length from 32-37 to 20-25 degrees, finishing section with permanent or smoothly increasing radius and permanent angle of crosswise tap and section of lengthwise tap with increasing cross-section and angle of crosswise tap increasing to the angle of crosswise tap of idling section. Note here that anvil swage length makes 0.57-0.58, that of finishing section makes 0.28-0.29, while that of angle of lengthwise tap makes 0.14-0.15 of total length of total length of roll working length.
EFFECT: higher precision of grooving the Pilger mill rolls.
4 cl, 1 tbl
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