RACK-AND-PINION DRIVE OF TUBE PILGER MILL ROLL Russian patent published in 2013 - IPC B21B21/00 

FIELD: process engineering.

SUBSTANCE: proposed drive comprises round constant pitch angle pinion engaged with mill roll and fixed rack engaged therewith. Required ratio between mill stand reciprocation liner speed and roll angular speed is ensured by making rack teeth side surfaces in the zone of mutual contact with pinion teeth side surfaces as conjugated surfaces formed in rolling of round pinion variable-radius centroid line over that of the rack. Note here that at sections corresponding to such angular positions of pinion and roll rigidly engaged therewith whereat tube is reduced in variable-radius roll. Note also that pinion centroid radial coordinate equals roll variable rolling radius to rule out dam of strain in tube billet.

EFFECT: ruled out axial strain in tube cold reduction.

5 dwg, 1 tbl