Metal foil machining roller

Abstract

A metal foil machining roller of the present invention is a metal foil machining roller in which a plurality of recessed portions are formed on a circumferential surface of the roller, wherein at least a surface layer portion contains a metal material with a Rockwell hardness in A scale of HRA 81.2 to 90.0 and a transverse rupture strength of 3 GPa to 6 GPa. By pressure-molding a metal foil by using the metal foil machining roller, protrusion portions of an approximately uniform shape with dimensions of several microns to several tens of microns can be formed efficiently on a surface of the metal foil on an industrial scale.

1 . A metal foil machining roller in which a plurality of recessed portions are formed on a circumferential surface by laser machining, wherein said recessed portions have an opening diameter of 1 μm to 35 μm, and at least a surface layer portion in which said recessed portions are formed comprises a metal material that has a Rockwell hardness in A scale of HRA 81.2 to 90.0 and a transverse rupture strength of 3 GPa to 6 Gpa. 
     
     
         2 . The metal foil machining roller in accordance with  claim 1 , wherein a cross-sectional shape of said recessed portions in a direction vertical to the circumferential surface of said metal foil machining roller is a taper shape in which a cross-sectional width becomes gradually or continuously smaller from the circumferential surface of said metal foil machining roller toward a bottom face of said recessed portions. 
     
     
         3 . The metal foil machining roller in accordance with  claim 1 , wherein an opening shape of said recessed portions in the circumferential surface of said metal foil machining roller is an approximately circular shape, an approximately elliptic shape, an approximately rhombic shape or an approximately regular polygonal shape. 
     
     
         4 . (canceled) 
     
     
         5 . The metal foil machining roller in accordance with  claim 1 , wherein a pitch of said recessed portions in a direction of an axis of said roller in the circumferential surface of said metal foil machining roller is 4 μm or more. 
     
     
         6 . The metal foil machining roller in accordance with  claim 1 , wherein said metal material has a Rockwell hardness in A scale of HRA 83.9 to 89.0. 
     
     
         7 . The metal foil machining roller in accordance with  claim 1 , wherein said metal material has a transverse rupture strength of 3.3 GPa to 5.5 Gpa. 
     
     
         8 . The metal foil machining roller in accordance with  claim 1 , wherein said metal material comprises at least one high melting point metal material selected from the group consisting of a cemented carbide, a cermet, a high speed steel, a die steel and a forged steel. 
     
     
         9 . The metal foil machining roller in accordance such that the bottom face of said recessed portions and a surface of a metal foil do not come into contact.