Method for producing milling roll

Abstract

A smooth roll (1) having a surface layer with water-retaining function is obtained by a method for producing a milling roll, comprising: a roughening process for blasting a surface (2a) of a roll substrate (2) constituting the smooth roll (1); and a coating process for spraying a thermal spray material over the roughened surface (2a) of the roll substrate (2) so as to form a thermal sprayed coating (3) having pores (5) that retain water. Satisfactory cereal powder is obtained by preventing drying of cereals in a milling process and retaining an adequate water content.

1 . A method for producing a milling roll, comprising:
 a roughening process for blasting a surface of a substrate; and   a coating process for spraying a thermal spray material over a roughened surface of the substrate so as to form a thermal sprayed coating having pores that retain water.   
     
     
         2 . The method for producing a milling roll according to  claim 1 , wherein a surface roughness Ra of the milling roll after the coating process is 2-15 μm. 
     
     
         3 . The method for producing a milling roll according to  claim 1 , wherein a surface roughness Ra of the substrate after the roughening process is within the range of −2 μm to +8 μm with respect to a surface roughness Ra of the milling roll after the coating process. 
     
     
         4 . The method for producing a milling roll according to  claim 1 , wherein Vickers hardness HV of a surface of the milling roll after the coating process is greater than 1000. 
     
     
         5 . The method for producing a milling roll according to  claim 1 , wherein the thermal spray material is a carbide cermet. 
     
     
         6 . The method for producing a milling roll according to  claim 1 , wherein an average thickness of the thermal sprayed coating is 10-150 μm. 
     
     
         7 . The method for producing a milling roll according to  claim 1 , comprising:
 an adjusting process A for shot blasting after the coating process so as to smooth fine unevenness in undulation of a surface of the thermal sprayed coating.   
     
     
         8 . The method for producing a milling roll according to  claim 1 , comprising:
 an adjusting process B for peak cutting after the coating process so as to planarize a tip of a convex portion on a surface of the thermal sprayed coating.