Surface treatment method and casting roll manufactured by the same

Abstract

A surface treatment method capable of preventing a surface defect by improving a surface shape determining surface roughness of a casting roll and a casting roll manufactured by the surface treatment method, are provided. A surface treatment method includes a concave-convex pattern forming operation of forming a concave-convex pattern on a surface of a casting roll; and an electrolytic polishing operation of electrolytically polishing so that a plurality of convex portions and concave portions of a concave-convex pattern formed in the concave-convex pattern forming operation are treated to be rounded.

1 . A surface treatment method comprising:
 a concave-convex pattern forming operation of forming a concave-convex pattern on a surface of a casting roll; and   an electrolytic polishing operation of electrolytically polishing so that a plurality of convex portions and concave portions of a concave-convex pattern formed in the concave-convex pattern forming operation are treated to be rounded.   
     
     
         2 . The surface treatment method of  claim 1 , wherein in the concave-convex pattern forming operation, a surface of the casting roll is surface-treated using a shot blasting process. 
     
     
         3 . The surface treatment method of  claim 2 , wherein in the shot blasting process of the concave-convex pattern forming operation, when the casting roll is surface-treated, a shot ball having a diameter of at least 2.8 mm is projected. 
     
     
         4 . A casting roll comprising:
 a casting roll main body; and   
       a surface treated part formed on a surface of the casting roll main body and formed so that a plurality of convex portions and concave portions of a concave-convex pattern are treated to be rounded by the surface treatment method according to  claim 1 . 
     
     
         5 . The casting roll of  claim 4 , wherein convex portions of the concave-convex pattern may be smoothly connected to concave portions of the concave-convex pattern adjacent thereto at an angle of less than 30 degrees. 
     
     
         6 . The casting roll of  claim 4 , further comprising a coating layer formed on the surface of the casting roll main body.