Surface-smoothened metal member and method for manufacturing same

Abstract

In a surface-smoothened metal member and a method for manufacturing the same, said surface-smoothened metal member has been smoothened to such an extent that in a surface of a large metal member formed from titanium or a titanium alloy, a flat surface portion has a maximum height roughness (Rz) of 1.1 μm or less and a portion with a curvature radius of 0.05 to 2.5 mm has a maximum height roughness (Rz) of less than 2 μm. This method for manufacturing the surface-smoothened metal member is characterized in that an anodic oxide film is formed on a surface of a substrate formed from titanium or a titanium alloy by applying an anodization treatment to the substrate, and the surface of the substrate is smoothened by removing the anodic oxide film.

1 . A surface-smoothened metal member comprising titanium or a titanium alloy, characterized in that:
 a maximum length of the metal member is 50 to 1000 mm;   a maximum height roughness (Rz) of a flat surface portion of the metal member is 1.1 μm or less; and   a maximum height roughness (Rz) of a portion of the surface of the metal member having a radius of curvature of 0.05 to 2.5 mm is less than 2 μm.   
     
     
         2 . The surface-smoothened metal member according to  claim 1 , wherein
 the metal member has a through hole and/or an opening, and   a maximum height roughness (Rz) of an inner wall of the through hole and/or the opening is also less than 2 μm.   
     
     
         3 . A surface-smoothened metal member comprising titanium or a titanium alloy, characterized in that
 a maximum length of the metal member is 50 to 1000 mm; and   an arithmetic mean roughness (Ra) of a portion of the surface of the metal member having a radius of curvature of 0.05 to 2.5 mm is less than 0.4 μm.   
     
     
         4 . The surface-smoothened metal member according to  claim 3 , wherein
 the metal member has a through hole and/or an opening, and   the arithmetic mean roughness (Ra) of an inner wall of the through hole and/or the opening is also less than 0.4 μm.   
     
     
         5 . The surface-smoothened metal member according to  claim 2 , wherein
 an equivalent circle diameter of the through hole and/or the opening is 0.1 to 5 mm.   
     
     
         6 . The surface-smoothened metal member according to  claim 2 , wherein
 a depth of the through hole and/or the opening is 1 to 50 mm.   
     
     
         7 . The surface-smoothened metal member according to  claim 1 , wherein
 the metal member is a frame body.   
     
     
         8 . A method for manufacturing a surface-smoothened metal member, comprising:
 subjecting a substrate made of titanium or a titanium alloy to anodization treatment to form an anodic oxide film on the surface of the substrate; and   smoothening the surface of the substrate by detaching the anodic oxide film.   
     
     
         9 . The method for manufacturing a surface-smoothened metal member according to  claim 8 , wherein a thickness of the anodic oxide film is set to 2 to 10 μm. 
     
     
         10 . The method for manufacturing a surface-smoothened metal member according to  claim 8 , wherein an applied voltage in the anodization treatment is set to 20 to 100 V. 
     
     
         11 . The method for manufacturing a surface-smoothened metal member according to  claim 8 , wherein the formation and detachment of the anodic oxide film is repeated until an arithmetic mean roughness (Ra) of less than 0.4 μm and/or a maximum height roughness (Rz) of less than 2 μm is obtained on the surface of the substrate. 
     
     
         12 . The surface-smoothened metal member according to  claim 4 , wherein
 an equivalent circle diameter of the through hole and/or the opening is 0.1 to 5 mm.   
     
     
         13 . The surface-smoothened metal member according to  claim 4 , wherein
 a depth of the through hole and/or the opening is 1 to 50 mm.   
     
     
         14 . The surface-smoothened metal member according to  claim 3 , wherein
 the metal member is a frame body.