MILL VIBRATION CONTROL APPARATUS AND METHOD

摘要

Apparatus for controlling vibration in a rolling mill, said apparatus including an entry roll (4) over which the moving strip material (2) passes on its way to the work rolls (10). Fitted to the roll (4) is an electric motor (6), or some alternative means of varying the speed of rotation of the roll (4), and hence the velocity of the strip material (2) as it passes over the roll. The electric motor is controlled by a feedback system comprising a control circuit (8) which receives input signals from one or more sensors (not shown) which measure one or more operational parameters of the rolling mill. Preferably the feedback system controls the motor (6) in such a way as to tend towards the stability condition in which the vibration of velocity DeltaV2 of the strip material (2) at the roll bite (3) moves in phase with and with equal amplitude to, the variation of velocity DeltaV1 of the strip material as it passes over the entry roll (4). In an alternative embodiment the vibration control apparatus acts on an exit roll positioned downstream of the roll bite (3).