Apparatus and method for suppressing growth of oxide film on coil

Abstract

An apparatus and a method for suppressing growth of an oxide film on a coil which is a spirally wound, rolled strip are disclosed. A rolled strip subjected to rolling by hot rolling equipment is wound spirally by a down-coiler to make a coil. Covers are disposed on the opposite sides of the coil such that heat resistant materials intimately contact the opposite sides of the coil. The covers are fixed by L-bolts and nuts to cover the opposite sides of the coil with the covers. In this state, the coil is naturally cooled for a predetermined time to suppress growth of an oxide film and increase productivity.

What is claimed is:  
     
         1 . An apparatus for suppressing growth of an oxide film on a coil which is a spirally wound, rolled strip, wherein: 
 covers are provided for covering at least opposite sides of the coil.    
     
     
         2 . The apparatus for suppressing growth of an oxide film on a coil as claimed in    claim 1   , wherein: 
 a heat insulating material is provided on a surface of each of the covers in intimate contact with the coil.    
     
     
         3 . The apparatus for suppressing growth of an oxide film on a coil as claimed in    claim 1   , wherein: 
 each of the covers is shaped like a ring having a through-hole at a center thereof, and eye rings formed to project toward the through-holes of the covers are connected together and fixed by bolts and nuts.    
     
     
         4 . The apparatus for suppressing growth of an oxide film on a coil as claimed in    claim 1   , wherein: 
 a cooling water path is provided in each of the covers.    
     
     
         5 . The apparatus for suppressing growth of an oxide film on a coil as claimed in    claim 3   , wherein: 
 each of the covers is shaped like a disk having a flange portion in an outer peripheral area of the cover, and the cooling water path is provided along a circumferential direction of the cover.    
     
     
         6 . The apparatus for suppressing growth of an oxide film on a coil as claimed in    claim 1   , wherein: 
 the covers are provided with a supply path and a discharge path for supplying and discharging an inert gas into and from a hollow portion of the coil.    
     
     
         7 . The apparatus for suppressing growth of an oxide film on a coil as claimed in    claim 6   , wherein: 
 each of the covers is shaped like a disk having a flange portion in an outer peripheral area of the cover, and the supply path and the discharge path for the inert gas which communicate with the hollow portion of the coil are provided in the center of the covers.    
     
     
         8 . The apparatus for suppressing growth of an oxide film on a coil as claimed in    claim 1   , wherein: 
 the covers are a cup for accommodating the coil and a cap for covering an opening of the cup.    
     
     
         9 . A method for suppressing growth of an oxide film on a coil which is a spirally wound, rolled strip, comprising: 
 cooling the coil while covering at least opposite sides of the coil with covers.    
     
     
         10 . The method for suppressing growth of an oxide film on a coil as claimed in    claim 9   , comprising: 
 cooling the coil while heat insulating surfaces of the covers and the coil in intimate contact with each other.    
     
     
         11 . The method for suppressing growth of an oxide film on a coil as claimed in    claim 9   , comprising: 
 cooling the coil by flowing cooling water in a cooling water path provided in each of the covers.    
     
     
         12 . The method for suppressing growth of an oxide film on a coil as claimed in    claim 9   , comprising: 
 cooling the coil while supplying and discharging an inert gas into and from a hollow portion of the coil.    
     
     
         13 . The method for suppressing growth of an oxide film on a coil as claimed in    claim 9   , comprising: 
 cooling the coil in an accommodated state.