Sharpening means for drilling tools

Abstract

A sharpening method and associated sharpening means ( 1 ) for a drilling tool ( 2 ), which is set with grinding segments ( 3 ) comprised of hard material. The sharpening means ( 1 ) is filled with abrasive materials ( 6 ) and is chordlike.

What is claimed is:  
     
         1 . A sharpening means for a drilling tool ( 2 ) having grinding segments ( 3 ) set with hard material and filled with abrasive materials ( 6 ), wherein the sharpening means is chordlike.  
     
     
         2 . The sharpening means of  claim 1 , wherein the sharpening means is cut to length from a supply roll ( 8 ).  
     
     
         3 . The sharpening means of  claim 1 , further comprising a plurality of intended break zones ( 9 ) along the chordlike length.  
     
     
         4 . The sharpening means of  claim 1 , further comprising a matrix ( 7 ) filled with abrasive materials ( 6 ).  
     
     
         5 . The sharpening means of  claim 3 , further comprising a tube ( 10 ) that is filled with loose abrasive materials.  
     
     
         6 . The sharpening means of  claim 5 , wherein the tube ( 10 ) is filled with a polymer ( 11 ) that swells on contact with water.  
     
     
         7 . The sharpening means of  claim 1 , having a thickness in the range of 1 mm to 10 mm.  
     
     
         8 . The use of a sharpening means ( 1 ) of  claim 1  for re-sharpening grinding segments ( 3 ) of a drilling tool ( 2 ).  
     
     
         9 . A method for sharpening a drilling tool ( 2 ) with grinding segments ( 3 ) set with hard material, wherein, in a first step, the drilling tool ( 2 ) produces a blind borehole ( 4 ), in a second step, a chordlike configured sharpening means ( 1 ) is installed circumferential and, in a third step, the sharpening means ( 1 ) is compressed by the grinding segments ( 3 ) of the drilling tool ( 2 ) against the floor ( 5 ) of the blind borehole ( 4 ) and, in a last step, the sharpening means is abrasively frictionally re-sharpened against a grinding means.  
     
     
         10 . The sharpening method of  claim 9 , wherein, in the last step, at least one of a lower r.p.m. and less cooling water supply is used relative to the normal use of the drilling tool ( 2 ).  
     
     
         11 . The sharpening means of  claim 4 , wherein the matrix ( 7 ) is a soft plastic matrix.  
     
     
         12 . The sharpening means of  claim 1 , having a thickness in the range of 2 mm to 6 mm.  
     
     
         13 . The sharpening means of  claim 5 , wherein the tube ( 10 ) is a water-insoluble tube.