Reel Driving Device Comprising Driving Rolls Provided with a Cast Envelope
The invention relates to a reel driving device for rolling mills, said device comprising an upper driving roll ( 1 ′) and a lower driving roll ( 1 ). The aim of the invention is to improve said reel driving device in such a way that the rolled product is not damaged by the rolls ( 1, 1 ), that the rolled product does not adhere to the rolls ( 1, 1 ′), and that the driving rolls ( 1, 1 ) can be economically created as standard expendable parts. To this end, the lower driving roll ( 1 ) comprises a steel roll axle ( 2 ) to which a cast envelope ( 3 ) adheres and/or onto which said cast envelope is shrunk and/or the upper driving roll ( 1 ′) comprises a cast envelope ( 3′ ) held between two clamping elements ( 5 ) arranged on an axle ( 2 ′).
1 . Reel driver for rolling mills with an upper and a lower driving roll, wherein the lower driving roll ( 1 ) has a steel roll shaft ( 2 ) on which a cast jacket ( 3 ) is mounted by adhesive bonding and/or shrink fitting, and that the upper driving roll ( 1 ′) has a cast jacket ( 3 ′) that is held between two clamping elements ( 5 ) arranged on a shaft ( 2 ′).
2 . Reel driver in accordance with claim 1 , wherein the cast jacket ( 3 , 3 ′) consists of ductile iron and has an outer working layer ( 4 , 4 ′) produced by the centrifugal casting process.
3 . Reel driver in accordance with claim 2 , wherein the ductile iron consists of 2.5-4.0 vol. % C, 1.0-4.0 vol. % Si, 0.2-2.0 vol. % Mn, <0.10 vol. % P, <0.05 vol. % S, <1.0 vol. % Cr, <5.0 vol. % Ni, <3.0 vol. % Mo, <1.0 vol. % Al, and <5.0 vol. % Cu.
4 . Reel driver in accordance with claim 1 , wherein the working layer ( 4 , 4 ′) consists of indefinite chill cast iron.
5 . Reel driver in accordance with claim 4 , wherein the indefinite chill cast iron consists of 2.7-3.8 vol. % C, 0.5-2.0 vol. % Si, 0.3-1.5 vol. % Mn, <0.15 vol. % P, <0.10 vol. % S, 1.0-3.5 vol. % Cr, 1.0-5.0 vol. % Ni, 0.1-0.8 vol. % Mo, 0.010-0.5 vol. % Al, and 0.5-5.0 vol. % Cu.
6 . Reel driver in accordance with claim 2 , wherein the working layer ( 4 , 4 ′) consists of indefinite chill cast iron with alloy carbides.
7 . Reel driver in accordance with claim 6 , wherein the indefinite chill cast iron with alloy carbides consists of 2.7-3.8 vol. % C, 0.5-2.0 vol. % Si, 0.3-1.5 vol. % Mn, <0.15 vol. % P, <0.10 vol. % S, 1.0-3.5 vol. % Cr, 1.0-5.0 vol. % Ni, 0.1-0.8 vol. % Mo, 0.010-0.5 vol. % Al, 0.5-5.0 vol. % Cu, 0.5-4.0 vol. % V, 0.5-5.0 vol. % Nb, and 0.5-5.0 vol. % Ta.
8 . Reel driver in accordance with claim 2 , wherein the working layer ( 4 , 4 ′) consists of chromium alloy cast iron.
9 . Reel driver in accordance with claim 8 , wherein the chromium alloy cast iron consists of 0.8-3.5 vol. % C, 0.5-2.0 vol. % Si, 0.4-3.0 vol. % Mn, <0.15 vol. % P, <0.10 vol. % S, 8-35 vol. % Cr, 0.5-4.0 vol. % Ni, 0.1-5 vol. % Mo, 0.5-5.0 vol. % Cu, 0.5-4.0 vol. % V, 0.5-5.0 vol. % Nb, and 0.5-5.0 vol. % Ta.
10 . Reel driver in accordance with claim 2 , wherein the working layer ( 4 , 4 ′) consists of high-speed steel (HSS).
11 . Reel driver in accordance with claim 10 , wherein the high-speed steel consists of 0.5-3.0 vol. % C, 0.5-2.0 vol. % Si, 0.4-3.0 vol. % Mn, <0.15 vol. % P, <0.10 vol. % S, 2-10 vol. % Cr, 0.5-4.0 vol. % Ni, 2-10 vol. % Mo, 0.5-5.0 vol. % Cu, 2-10 vol. % V, and 1-15 vol. % W.