Combined operating modes and frame types in tandem cold rolling mills

摘要

The invention relates to a method for combining the operating modes of individual rolling frames in a tandem cold rolling mill comprising respective pairs of working rolls ( 10 ) and back-up rolls ( 12 ) in 4-roll frames and in addition a pair of intermediate rolls ( 11 ) in 6-roll frames, at least the working rolls ( 10 ) and the intermediate rolls ( 11 ) interacting with devices for axial displacement. Said method is characterised by a combination of the following technologies: use of CVC/CVC^plus technology with CVC roll contours of a higher order, where each working/intermediate roll ( 10, 11 ) comprises a roll surface that is extended by the amount of the travel displacement; use of Pair Cross (PC) technology, whereby each working/intermediate roll ( 10, 11 ) can be pivoted parallel to the strip plane; use of strip-edge oriented displacement of the working/intermediate rolls ( 10, 11 ), each of the latter ( 10, 11 ) having a roll surface that is extended by the amount of the travel displacement, with a cylindrical or spherical section and said rolls being displaced symmetrically against one another relative t o the neutral displacement position (S_ZW=0 and S_AW=0 ) in the centre of the frame (Y-Y) by an identical amount in the direction of their rotational axes (X-X). The method is also characterised in that the CVC/CVC^Plus technology, the strip-edge oriented displacement technology and optionally the PC technology can be achieved using a suitable plant concept with a single geometrically identical set of rolls.