Stamping tool, casting mold and methods for structuring a surface of a work piece

Abstract

A simple, cost-effective stamping or molding in the nanometer range is enabled using a stamping surface or molding face with a surface layer having hollow chambers that have been formed by anodic oxidation.

What is claimed is: 
     
       1. Method for producing a stamping tool with a structured stamping surface, comprising the steps of:
 oxidizing a surface or covering layer of the stamping tool for forming the stamping surface at least partially anodally and forming open hollow chambers that are at least essentially uniformly shaped and at least essentially evenly distributed over the surface or surface area of the stamping surface without the use of a model.   
     
     
       2. Method according to  claim 1 , wherein the surface or covering layer is oxidized potentiostatically. 
     
     
       3. Method according to  claim 1 , wherein the surface layer or covering layer is oxidized with varying voltage. 
     
     
       4. Method according to  claim 3 , wherein the surface or covering layer is oxidized galvanostatically. 
     
     
       5. Method according to  claim 1 , wherein the surface or covering layer that is oxidized is formed of a material selected from the group consisting of aluminum, silicon, iron, steel and titanium. 
     
     
       6. Method according to  claim 1 , comprising the additional step of modifying the stamping surface at least one of before and after said oxidizing step for producing a rough structure. 
     
     
       7. Method for structuring a surface of a work piece in a nanometer range by means of a stamping tool with a structured stamping surface, comprising at least one of pressing and rolling a stamping surface, formed of an anodally oxidized surface or covering layer with open hollow chambers which have diameters in a nanometer range that have been created model-free by anodic oxidation, onto the surface to be structured. 
     
     
       8. Method according to  claim 7 , wherein the surface is first roughly structured in a first step by means of a first stamping tool and then is finely structured by means of a second stamping tool in a second step. 
     
     
       9. Method according to  claim 8 , wherein the surface is finely structured by means of said second stamping tool in said second step with a stamping force that is reduced relative to that applied with said first stamping tool. 
     
     
       10. Method according to  claim 8 , wherein the surface is finely structured by means of said second stamping tool in said second step after hardening of the surface structured by said first step. 
     
     
       11. Method for at least partially structuring a surface of a cast work piece, comprising the steps of: casting the work piece using a casting mold with a structured molding face having an anodally oxidized surface or covering layer with open hollow chambers created model-free by anodic oxidation. 
     
     
       12. Method according to  claim 11 , wherein the surface or covering layer is formed at least substantially of a material selected from the group consisting of aluminum oxide, silicon oxide, iron oxide, oxidized steel, and titanium oxide. 
     
     
       13. Method for producing an anti-reflection surface having a moth-eye structure on a workpiece, comprising:
 pressing or rolling a first tool onto a surface of the workpiece to form a rough structure on the surface of the workpiece, and then   pressing or rolling a second tool onto the surface of the workpiece to form the moth-eye structure having a plurality of fine protrusions.    
     
     
       14. The method of claim 13, wherein the rough structure has projections of an order ranging from 0.1 to 50 micrometers.  
     
     
       15. The method of claim 13, wherein the diameters of the plurality of fine protrusions is ranging from 10-500 nm.  
     
     
       16. The method of claim 15, wherein the diameters of the plurality of fine protrusions is ranging from 15-200 nm.  
     
     
       17. The method of claim 16, wherein the diameters of the plurality of fine protrusions is ranging from 20-100 nm.  
     
     
       18. The method of claim 13, wherein
 the first tool is pressed or rolled onto the surface of the workpiece with a first stamping force, and   the second tool is pressed or rolled onto the surface of the workpiece with a second stamping force which is reduced relative to the first stamping force.