System to control the surface profile of the back-up rolls in four-high rolling stands and relative back-up roll

摘要

System to control the surface profile of the back-up rolls in four-high rolling stands (11) to produce flat products (14), the four-high rolling stand (11) comprising working rolls (12) and back-up rolls, wherein each back-up roll (13) comprises deforming elements (18) consisting of means made of magnetostrictive material (19, 119) on which coils (20, 120) are directly wound and connected with autonomous means of electric supply to generate a magnetic field, the system comprising a control and regulation unit (24), connected with at least means (25) to control the planarity and/or thickness of the rolled product (14) leaving the rolling stand (11), for the controlled activation and feed of each of the coils generating the magnetic field (20, 120).;Back-up roll for four-high rolling stands comprising means made of magnetostrictive material to achieve the control system as described above.