THICKNESS CONTROLLING AND DEVICE OF ROLLING HOOP MATERIAL

摘要

The thickness (t) of sheet or strip is controlled during rolling in a mill, where one set of roll chocks is subjected to a force (R) displacing the roll; and R is greater than the rolling force (P); and a counter force (X) is exerted in the opposite direction to R and depends on the stiffness factor (I) of the roll stand. Force (R) alters during rolling according to R = K2P; where K2 = (K1/K) + 1; and K1 is the proportionality factory between R and X. Pref. a four-high mill is used where at least one set of roll chocks can be driven vertically via a pressure device, and where hydraulic cylinders are located between the chocks of the two work rolls. Hydraulic load cells are located between the pressure device and the chocks for the upper back-up roll. The load cells are connected in a hydraulic circuit feeding hydraulic fluid to a cylinder carrying the chocks for the lower back-up roll.