Device and method for cooling rolls used for rolling in a highly turbulent environment

Abstract

A rolling stand for metallic products including at least one pair of work rolls, at least a pair of back-up rolls, at least one water pillow cooling device able to project a plurality of cooling jets under pressure on at least one of said work roll, a removable plate. The removable plate is placed between said cooling device and said work roll. The removable plate is concave and curved with a curvature such that a gap between said removable plate and said upper work roll is constant or increases when moving in direction of the back-up roll and such that said gap is from 5 to 200 mm. The removable plate is also holed such that the cooling jets can pass through said removable plate.

What is claimed is: 
     
         1 - 11 . (canceled) 
     
     
         12 : A rolling stand for metallic products comprising:
 a pair of work rolls;   a pair of back-up rolls;   at least one water pillow cooling device including a plurality of nozzles capable of spraying a plurality of cooling jets under pressure onto one of the work rolls, exits of the nozzles being arranged along a curved surface of the at least one water pillow cooling device, a curvature of the curved surface of the at least one water pillow cooling device being greater than a radius of the one work roll; and   a removable plate placed between the at least one water pillow cooling device and the one work roll, the removable plate being concave and with a curvature such that a gap between the removable plate and the one work roll is constant or increases when moving in a direction of the at least one back-up roll, the gap being from 5 to 200 mm and the curvature of the removable plate being smaller than the curvature of the curved surface, the removable plate having holes to allow the cooling jets passing through the holes in the removable plate.   
     
     
         13 : The rolling stand according to  claim 12  wherein the removable plate includes a metal layer and a protective layer preventing corrosion. 
     
     
         14 : The rolling stand according to  claim 13  wherein the metal layer is stainless-steel and the protective layer is silicon. 
     
     
         15 : The rolling stand according to  claim 12  wherein the water pillow cooling device is capable of spraying from 100 to 700 m 3 ·h −1  of coolant per square meter of the work roll surface and at a pressure from 0.5 to 6 bar. 
     
     
         16 : The rolling stand according to  claim 15  wherein the water pillow cooling device is capable of spraying from 300 to 700 m 3 ·h −1  of coolant per square meter of work roll surface and at a pressure from 2 to 6 bar. 
     
     
         17 : A method for cooling the work roll in the rolling stand according to  claim 12  comprising:
 spraying a coolant via the at least one water pillow cooling device towards the one work roll; and 
 producing a coolant pillow in a highly turbulent state in the gap between the one work roll and the removable plate. 
 
     
     
         18 : The method according to  claim 17  wherein the coolant is sprayed at a rate from 100 to 600 m 3 ·h −1  per square meter of work roll surface and at pressure from 0.5 to 6 bar. 
     
     
         19 : The method according to  claim 18  wherein the coolant is sprayed at a rate from 300 to 600 m 3 ·h −1  per square meter of work roll surface and at pressure from 2 to 6 bar.