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.
Claims20
A rolling stand suitable to finish a metal product, the rolling stand comprising:
- bottom and top work rolls the top work roll having a smaller diameter than the bottom work roll, the bottom and top work rolls being rotatable at different peripheral speeds while under is rolling load;
- a motor system for transmitting rotation to each of the bottom and top work rolls to allow for different peripheral speeds of the bottom and top work rolls while under the rolling load;
- top and bottom back-up rolls, the top back-up roll having a bigger diameter than the bottom back up roll, the top back-up roll being adjacent to the top work roll and the bottom back-up roll being 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.
A hot rolling plant for the production of metal products, the plant as arranged in a direction of rolling comprising:
- a pre-finishing unit, suitable to pre-finish the metal product, comprising a plurality of pre-finishing rolling stands,
- a finishing unit, suitable to finish the metal product, comprising at least two finishing rolling stands,
- wherein at least one finishing rolling stand comprises:
- a first work roll and a second work roll rotatable from each other so as to allow for different peripheral speeds of each of first and second work rolls while under a rolling load,
- a motor system for transmitting rotation to each of the first and second work rolls to allow for different peripheral speeds of the first and second work rolls while under the rolling load;
- wherein the respective second work rolls have a smaller diameter than the first work rolls, wherein the finishing rolling stands comprise back-up rolls having different diameters, wherein the second back-up roll is adjacent to the second work roll and has a bigger diameter than the first back-up roll, adjacent to the first work roll.
Dependencies are inferred from the claim text.