Rolling Plant
AssigneeDanieli & C. Officine Meccaniche SpA
InventorsMilorad Pavlicevic, Alfredo Poloni, Simone Barcherini, Gianluca Bazzaro
Life of this patent
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Abstract
A hot-rolling plant (50) for the production of metal strips comprising a roughing stand (2), a reheating furnace (3) or a maintenance tunnel for maintaining the temperature of the product, a pre-finishing mill train (4), comprising three or four stands, a finishing mill train (5), comprising two or three stands, for finishing the product, in which the work rolls of one stand are provided with their own motor drive, independent one from each other, so as to allow the peripheral speeds of both of said work rolls to be autonomously varied under rolling load.
Claims19
Rolling stand, of the four-high or six-high type, suitable to finish a metal product, in particular steel strips, comprising bottom and top work rolls, the top work roll having a smaller diameter than the bottom work roll each of said work rolls being suitable to be made to rotate independently one from each other by motor means, so as to allow the peripheral speeds of both of said work rolls to be autonomously varied under rolling load,
- comprising top and bottom back-up rolls having a different diameter one from each other,
- the top back-up roll being adjacent to the top work roll and having a bigger diameter than the bottom back-up roll, adjacent to the bottom work roll,
- characterized in that the diameters of the respective back-up rolls and work rolls satisfy the following formula:
- dBUR,t4+dWR,t4=dBUR,b4+dWR,b4, where
- dBUR,t=diameter of the top back-up roll,
- dWR,t=diameter of the top work roll,
- dBUR,b=diameter of the bottom back-up roll,
- dWR,b=diameter of the bottom work roll.
Hot rolling plant for the production of metal products, in particular of steel strips, defining a direction of rolling, comprising, arranged in the direction of rolling,
- a pre-finishing unit, suitable to pre-finish the metal product, comprising a plurality of pre-finishing rolling stands,
- a finishing unit 3, suitable to finish the metal product, comprising at least two finishing rolling stands,
- wherein at least one finishing rolling stand is provided with bottom work roll and top work roll suitable to be made to rotate independently one from each other by motor means, so as to allow the peripheral speeds of each of the work rolls to be autonomously varied under rolling load,
- wherein the respective top work rolls have a smaller diameter than the bottom work rolls,
- wherein the finishing rolling stands comprise back-up rolls having different diameters, wherein the top back-up roll is adjacent to the top work roll and has a bigger diameter than the bottom back-up roll, adjacent to the bottom work roll,
- wherein the diameters of the respective back-up rolls and work rolls satisfy the following formula:
- dBUR,t4+dWR,t4=dBUR,b4+dWR,b4, where
- dBUR,t=diameter of the top back-up roll,
- dWR,t=diameter of the top work roll,
- dBUR,b=diameter of the bottom back-up roll,
- dWR,b=diameter of the bottom work roll.
Dependencies are inferred from the claim text.