Roll device for rolling metal strips, roll arrangement for use in such a roll device and method for converting a roll device
A roll device for rolling metal strips comprises a first and a second work roll which define a roll gap therebetween, and a first and a second backup roll. In a common rolling mill stand, at least one work roll is mounted in work roll chocks and the backup rolls are mounted in backup roll chocks. The work roll chocks are designed such that the first and/or the second work roll can each be replaced by a roll arrangement having a work roll with a smaller diameter and at least one additional roll. The work roll with the smaller diameter is supported via the additional roll. The additional roll is mounted in additional roll chocks and the work roll with the smaller diameter is situated in work roll bearings of the additional roll chocks.
1 . A five-high rolling mill stand for rolling metal strips, comprising:
a rolling mill stand ( 2 );
an upper backup roll ( 11 ) mounted to the rolling mill stand ( 2 ) by upper backup roll chocks ( 13 );
an upper work roll ( 4 ), the upper work roll ( 4 ) being directly supported by the upper backup roll ( 11 ) and mounted to the rolling mill stand ( 2 ) by upper work roll chocks ( 5 );
a lower work roll ( 6 ), the lower work roll ( 6 ) having a smaller diameter than the upper work roll ( 4 );
a lower backup roll ( 12 ) mounted to the rolling mill stand ( 2 ) by lower backup roll chocks ( 14 );
an additional roll ( 8 ) arranged between the lower work roll ( 6 ) and the lower backup roll ( 12 ) for indirectly supporting the lower work roll ( 6 ), the additional roll ( 8 ) being mounted by additional roll chocks ( 7 ); and
a roll gap (W) between the upper work roll ( 4 ) and the lower work roll ( 6 ),
wherein the lower work roll ( 6 ) is situated in lower work roll bearings ( 9 ) of the additional roll chocks ( 7 ), and
wherein the additional roll ( 8 ) and the lower work roll ( 6 ) form a replaceable roll arrangement ( 10 ),
wherein the lower work roll bearings ( 9 ) are disposed in upwardly open pockets ( 26 ) of the additional roll chocks ( 7 ), and
wherein a position of the lower work roll bearings ( 9 ) within the replaceable roll arrangement ( 10 ) is adjustable by exchangeable wear plates ( 16 ) or by a hydraulic setting device.
2 . The five-high rolling mill stand according to claim 1 ,
wherein a position of the lower work roll bearings ( 9 ) within the replaceable roll arrangement ( 10 ) is adjustable by the exchangeable wear plates ( 16 ).
3 . The five-high rolling mill stand according to claim 2 ,
wherein the lower work roll bearings ( 9 ) are disposed in upwardly open pockets ( 26 ) of the additional roll chocks ( 7 ), and
wherein the position of the lower work roll bearings is adjusted axially and/or transversely to a longitudinal extension of the roll gap (W).
4 . The five-high rolling mill stand according to claim 1 ,
wherein the additional roll ( 8 ) has a larger diameter than the lower work roll ( 6 ) of the replaceable roll arrangement ( 10 ).
5 . The five-high rolling mill stand according to claim 1 ,
wherein the lower work roll ( 6 ) has a diameter that is smaller than or equal to half the diameter of the upper work roll ( 4 ′).
6 . The five-high rolling mill stand according to claim 5 ,
wherein the diameter of the additional roll ( 8 ) is smaller than or equal to the diameter of the upper work roll ( 4 ).
7 . The five-high rolling mill stand according to claim 1 ,
wherein the lower work roll bearings ( 9 ) are situated in pockets ( 26 ) on a side of the additional roll chocks ( 7 ) turned towards the roll gap (W) in an installed position.
8 . The five-high rolling mill stand according to claim 1 , wherein the lower work roll ( 6 ) of the replaceable roll arrangement ( 10 ) is supported on at least one side parallel to an axis of rotation of the lower work roll ( 6 ) over at least part of a length of the lower work roll ( 6 ) by a hydrostatic support bearing ( 17 ).
9 . The five-high rolling mill stand according to claim 8 ,
wherein a position of an axis of rotation of the lower work roll ( 6 ) in the lower work roll bearings ( 9 ) of the replaceable roll arrangement ( 10 ) is adjusted relative to a position of an axis of rotation of the additional roll ( 8 ).
10 . The five-high rolling mill stand according to claim 9 ,
wherein the lower work roll ( 6 ) is movably mounted in the lower work roll bearings ( 9 ) of the replaceable roll arrangement ( 10 ) transversely to the axis of rotation of the lower work roll ( 6 ) and is positioned by a support shell ( 18 ) of the hydrostatic support bearing ( 17 ).
11 . The five-high rolling mill stand according to claim 10 ,
wherein the support shell ( 18 ) extends over a substantial part of a barrel length of the lower work roll ( 6 ).
12 . The five-high rolling mill stand according to claim 11 , wherein the support shell ( 18 ) is set and/or held against the lower work roll ( 6 ) via the hydraulic setting device.
13 . The five-high rolling mill stand according to claim 12 ,
wherein at least one guide element for a rolled material is provided as a setting device.
14 . The five-high rolling mill stand according to claim 13 ,
wherein the setting device comprises a plurality of adjusting cylinders ( 22 ), which act on the support shell ( 18 ) with actuating elements ( 23 ).
15 . The five-high rolling mill stand according to claim 1 ,
wherein at least one of the additional roll chocks ( 7 ) and/or at least one of the lower work roll bearings ( 9 ) of the replaceable roll arrangement ( 10 ) comprises at least one media coupling ( 24 , 25 ).