Tool for roughening a borehole surface

Abstract

A tool for roughening a borehole surface. The tool includes a coupling portion for clamping the tool in a drilling machine; and a tool head for machining the borehole surface, where the tool head has an outer shell surface on which a cutter protrudes laterally from the shell surface, and where the outer shell surface has a camber along the longitudinal direction of the tool.

1 : A tool for roughening a borehole surface, comprising:
 a coupling portion for clamping the tool in a drilling machine; and   a tool head for machining the borehole surface,   wherein the tool head has an outer shell surface on which a cutter protrudes laterally from the shell surface, and   wherein the outer shell surface has a camber along the longitudinal direction of the tool.   
     
     
         2 : The tool according to  claim 1 , wherein
 the outer shell surface has a maximum diameter, which is disposed centrally with respect to the longitudinal extent of the tool head.   
     
     
         3 : The tool according to  claim 1 , wherein
 the cutter comprises pins of a cutting material, and   wherein the pins are distributed circumferentially with an angular spacing.   
     
     
         4 : The tool according to  claim 3 , wherein
 the pins are disposed with an angular spacing with respect to the longitudinal axis of the tool, and   wherein the angular spacing is 30° to 180°.   
     
     
         5 : The tool according to  claim 1 , wherein
 the maximum diameter of the tool head is smaller than the nominal diameter of a borehole to be machined.   
     
     
         6 : The tool according to  claim 1 , wherein
 the coupling portion is disposed at a first end of a tool shank and the tool head at an opposite, second end of the tool shank, and   wherein the tool shank has a diameter smaller than that of the tool head.   
     
     
         7 : The tool according to  claim 6 , wherein
 the tool shank is at least as long as the tool head in axial direction.   
     
     
         8 : The tool according to  claim 1 , wherein
 the axial length of the tool head corresponds to at least nine times the maximum diameter of the tool head.   
     
     
         9 : The tool according to  claim 1 , wherein
 the axial length of the tool head corresponds to at least nine times the nominal diameter of a borehole to be machined.   
     
     
         10 : The tool according to  claim 1 ,
 the largest diameter of the tool head is at least 30% larger than the diameter of a tool shank joining a tool head and coupling portion.   
     
     
         11 : The tool according to  claim 3 , wherein
 the pins are disposed with an angular spacing with respect to the longitudinal axis of the tool, and   wherein the angular spacing is 60° to 150°.   
     
     
         12 : The tool according to  claim 1 , wherein
 the cutter comprises carbide or diamond pins,   wherein the pins are distributed circumferentially with an angular spacing.