TUBE-ROLLING MILL'S BACK TABLE Russian patent published in 2009 - IPC B21B25/00 

FIELD: metallurgy.

SUBSTANCE: most effectively invention can be used in piercing, rolling, metering mills. Back table of tube-rolling mill contains frame, installed in it delivering rollers, centering unit, alternate with delivery rollers, feed rolls and resistant-control gear. Delivering and feed rolls are implemented in the form of bottom driving and top idle or driving rolls, cases of which are located at equal distance from the rolling axis and connected by draw bars, which are projection of hydrocylinder fixed agreeably on cases of top and bottom rolls, herewith A=B, C=E, R₁=(0.92÷0.95)·R₂, where: A - distance apart from case fixation axis of top roll up to coupling bar fixation axis, B - distance apart from case fixation axis of bottom roll up to hydrocylinder fixation axis, C - distance from coupling bar fixation axis up to hydrocylinder fixation axis, E - distance from case fixation axis of top roll up to case fixation axis of bottom roll, R₁ - turning radius of case with bottom roll, R₂ - turning radius of case with bottom roll.

EFFECT: cycle time reduction and productivity improvement of mill, ability of automatic regulation of solution between top and bottom roll during changing of assortment and simultaneous inclusion of bottom and top rolls.

6 dwg