Method and apparatus for making cold-pilger-rolled tubes

摘要

An apparatus for making a cold-pilger-rolled tube has two grooved pilger rolls rotatable about respective axes to compress a workpiece moving in a travel direction against a mandrel extending in the direction between a nip formed between the rolls and anchored upstream of the nip in a thrust block. Workpiece thickness is adjusted on the fly by measuring a wall thickness of the workpiece downstream in the direction from the roll as the workpiece passes through the nip and for displacing the thrust block and mandrel in to the travel direction as the workpiece passes through the nip in accordance with the measured wall thickness.

主权项

1. An apparatus for making a cold-pilger-rolled tube, the apparatus comprising:
a reciprocating roll frame; a thrust block upstream in a travel direction from the roll frame; a mandrel extending downstream in the travel direction from the thrust block into the roll frame; two grooved pilger rolls rotatable about respective axes in the reciprocating roll frame to compress a workpiece moving in the travel direction against the mandrel extending in the direction through a nip formed between the grooved rolls; means for measuring a wall thickness of the workpiece downstream in the travel direction from the rolls as the workpiece passes through the nip; and means for displacing the thrust block and mandrel in or transverse to the travel direction as the workpiece passes through the nip in accordance with the measured wall thickness to correct nonuniformities in the wall thickness determined from the measured wall thickness.