Cold rolling mill

Abstract

The present application describes a Cold Rolling Mill (CRM) 200 . The CRM 200 comprises a pair of working rolls 202 configured to apply stress on a metal strip for reducing thickness of the metal strip. The pair of working rolls 202 have a face width of 1350 mm. The CRM 200 further comprises a pair of intermediate rolls 204 configured to provide mechanical support to the pair of working rolls 202 . The pair of intermediate rolls 204 have a face width of 1280 mm. The CRM 200 further comprises a pair of back-up rolls 206 configured to provide mechanical support to the pair of intermediate rolls 204 . The back-up rolls 206 have a face width of 1300 mm. Bearing center distance of the CRM 200 is 2170 mm.

1 . A Cold Rolling Mill (CRM) ( 200 ) comprising:
 a pair of working rolls ( 202 ) configured to apply stress on a metal strip for reducing thickness of the metal strip, wherein a face width of the pair of working rolls ( 202 ) is 100 mm to 120 mm greater than a width of the metal strip;   a pair of intermediate rolls ( 204 ) configured to provide mechanical support to the pair of working rolls ( 202 ), wherein a face width of the pair of intermediate rolls ( 204 ) is 30 mm to 50 mm greater than the width of the metal strip; and   a pair of back-up rolls ( 206 ) configured to provide mechanical support to the pair of intermediate rolls ( 204 ), wherein a face width of the pair of back-up rolls ( 206 ) is 50 mm to 70 mm greater than the width of the metal strip.   
     
     
         2 . The CRM ( 200 ) as claimed in  claim 1 , wherein the CRM ( 200 ) is a 4-Hi CRM or a 6-Hi CRM. 
     
     
         3 . The CRM ( 200 ) as claimed in  claim 2 , wherein the width of the metal strip is 1250 mm. 
     
     
         4 . The CRM ( 200 ) as claimed in  claim 1 , wherein a bearing center distance of the CRM ( 200 ) is 2170 mm. 
     
     
         5 . The CRM ( 200 ) as claimed in  claim 1 , wherein the CRM ( 200 ) is configured to transfers more stress on the metal strip such that less stress remains on each of the pairs of rolls ( 202 ,  204 ,  206 ) resulting in better strip shape and greater reduction of thickness of the metal strip. 
     
     
         6 . A method of reducing thickness of a metal strip using a Cold Rolling Mill (CRM) ( 200 ), the method comprising:
 applying stress on the metal strip via a pair of working rolls ( 202 ) of the CRM;   mechanically supporting the pair of working rolls ( 202 ) via a pair of intermediate rolls ( 204 ) of the CRM ( 200 ); and   mechanically supporting the pair of intermediate rolls ( 204 ) via a pair of back-up rolls ( 206 ),   wherein a face width of the pair of working rolls ( 202 ) is 100 mm to 120 mm greater than a width of the metal strip.   
     
     
         7 . The method as claimed in  claim 6 , wherein a face width of the pair of intermediate rolls ( 204 ) is 30 mm to 50 mm greater than the width of the metal strip. 
     
     
         8 . The method as claimed in  claim 6 , wherein a face width of the pair of back-up rolls ( 206 ) is 50 mm to 70 mm greater than the width of the metal strip. 
     
     
         9 . The method as claimed in  claim 6 , wherein the width of the metal strip is 1250 mm. 
     
     
         10 . The method as claimed in  claim 6 , wherein a bearing center distance of the CRM ( 200 ) is 2170 mm. 
     
     
         11 . The method as claimed in  claim 6 , wherein more stress is applied on the metal strip such that less stress remains on each of the pairs of rolls ( 202 ,  204 ,  206 ). 
     
     
         12 . The method as claimed in  claim 6 , wherein the CRM ( 200 ) is a 4-Hi CRM or a 6-Hi CRM.