METHOD FOR MINIMIZING THICKENED END PORTIONS AT ROLLING TUBES IN STRETCH - REDUCING MILL Russian patent published in 2004 - IPC

FIELD: processes for rolling tubes in stretch reducing mills. SUBSTANCE: method for minimizing thickened end portions of tubes rolled in stretch reducing mill comprises steps of temporarily changing torque of separate drive rolling stands when leading and end portion of tube are passed respectively through stretch reducing mill. Tube end portions are rolled at relation of revolution numbers of rolls exceeding stationary relations of roll revolution numbers; between stationary and increased relation values of roll revolution numbers setting relations of roll revolution numbers less than stationary ones. EFFECT: enhanced efficiency due to elimination of number of tubes rejected because of their thickened ends. 3 dwg