Press Hardening Tool

Abstract

The invention relates to a press hardening tool having a shaping surface ( 2 ) that is used to shape a blank. The shaping surface ( 2 ) of the tool ( 1 ) is micro-structured at least in some areas by micro-recesses ( 3 ) introduced into the shaping surface ( 2 ). In said areas, the contact surface between the shaping surface ( 2 ) of the tool ( 1 ) and the surface of a blank is limited to the surface portions ( 4 ) located between the recesses ( 3 ) of the forming surface ( 2 ) and raised with respect to the recesses ( 3 ).

1 . A press hardening tool having a shaping surface ( 2 ) used for forming a blank, characterized in that at least some regions of the shaping surface ( 2 ) of the tool ( 1 ) are microstructured by micro-recesses ( 3 ) that are introduced into the forming surface ( 2 ) and, in these regions, the contact area between the forming surface ( 2 ) of the tool ( 1 ) and the surface of a blank is limited to those area portions ( 4 ) that are located between the recesses ( 3 ) of the forming surface ( 2 ) and are raised relative to the recesses ( 3 ). 
     
     
         2 . The tool according to  claim 1 , characterized in that the micro-recesses ( 3 ) are arranged in the manner of a grid with respect to each other. 
     
     
         3 . The tool according to  claim 1  or  2 , characterized in that the recesses ( 3 ) have an angular, in particular equilateral, contour geometry, for example a rhombic contour geometry. 
     
     
         4 . A tool according to any one of  claims 1  to  3 , characterized in that the effective contact area of the forming surface ( 2 ) is less than 70 percent of the microstructured region. 
     
     
         5 . A tool according to any one of  claims 1  to  4 , characterized in that only certain forming surface regions of the tool are microstructured. 
     
     
         6 . A tool according to any one of  claims 1  to  5 , characterized in that the microstructured forming surface region or regions of the tool are created by way of a microforging method, in particular by way of a knocking method. 
     
     
         7 . A tool according to any one of  claims 1  to  6 , characterized in that the micro-recesses are applied in the manner of an irregularly designed arrangement and surface texture. 
     
     
         8 . A tool according to any one of  claims 1  to  7 , characterized in that added solid and/or liquid lubricants are tapped into the micro-recesses.