| 摘要 |
A pilger mill comprising a pair of sizing rolls, each provided with a plurality of facing parallel tube-rolling grooves, mounted on a reciprocating carriage which, during its reciprocation, drives by means of a rack-and pinion transmission the roll pairs at the unison and in opposite directions. Each roll groove comprises a reducing section and an idle section. The reducing sections of each groove pair are angularly offset with respect to the reducing sections of the other grooves of each roll so that, in operation, the reducing of only one tube at a time is effected.
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