Patent ID: 8424354

Claim:
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: d BUR,t 4 +d WR,t 4 =d BUR,b 4 +d WR,b 4 , where d BUR,t =diameter of the top back-up roll, d WR,t =diameter of the top work roll, d BUR,b =diameter of the bottom back-up roll, d WR,b =diameter of the bottom work roll.