Drilling tool, in particular spiral drill

Abstract

In a drilling tool, in particular a spiral drill, in particular for drilling rock, comprising a tool-side fastening end, a workpiece-side cutting end and an interposed cutting part comprising at least one main helical groove extending along the cutting part, which is defined by a substantially constant helix pitch, and at least one partially cylindrical and/or partially conical helix web outer face extending along the cutting part, defined by at least one main helical groove, it is provided that a plurality of groove sections are formed in the helix web outer face, which extend transversely to the direction of the pitch of the main helical groove.

1 . A drilling tool, in particular a spiral drill, in particular for drilling rock, comprising a tool-side fastening end, a workpiece-side cutting end and an interposed cutting part comprising at least one main helical groove extending along the cutting part, which is defined by a substantially constant helix pitch, and at least one partially cylindrical and/or partially conical helix web outer face extending along the cutting part, defined by said at least one main helical groove, characterised in that a plurality of groove sections are formed in the helix web outer face, which extend transversely to the direction of the pitch of the main helical groove. 
   
   
       2 . The drilling tool according to  claim 1 , characterised in that the plurality of groove sections are arranged parallel to one another. 
   
   
       3 . The drilling tool according to  claim 1  or  2 , characterised in that the plurality of groove sections each extend from an edge of the main helical groove facing the cutting end to an edge of the main helical groove facing the fastening end. 
   
   
       4 . The drilling tool according to any one of the preceding claims, characterised in that the plurality of groove sections lie on at least one common auxiliary helical track whose pitch is smaller than the pitch of the main helical groove. 
   
   
       5 . The drilling tool according to  claim 4 , characterised in that the pitch of the at least one auxiliary helical track is smaller than the pitch of the main helical groove in such a manner that the helical course of the auxiliary helical track during one revolution is interrupted at least once, preferably several times, in particular more than five to ten times, by the main helical groove. 
   
   
       6 . The drilling tool according to  claim 4  or  5 , characterised in that the pitch of the main helical track is at least twice, in particular five times, preferably ten times, in particular twelve or fifteen times larger than the pitch of the auxiliary helical track. 
   
   
       7 . The drilling tool according to any one of  claims 4  to  6 , characterised in that the pitch of the auxiliary helical track and/or the at least one pitch of the main helical groove remain unchanged along the cutting part ( 11 ). 
   
   
       8 . The drilling tool according to any one of  claims 4  to  7 , characterised in that if a diameter of the drilling tool is 5 mm, 6 mm, 6.5 mm, 7 mm, 8 mm, 9 mm or 10 mm, a pitch of the auxiliary helical track in a range of 0.5 mm to 3 mm, preferably of 1 mm to 2.5 mm, preferably of 1.5 to 2 mm is selected, wherein in particular the pitch of the main helical groove is selected in a range of 15 mm to 40 mm, preferably of 20 mm to 30 mm. 
   
   
       9 . The drilling tool according to any one of the preceding claims, characterised in that a width of the plurality of groove sections and/or a radial depth of the plurality of groove sections is smaller than a width of the main helical groove or a depth of the main helical groove. 
   
   
       10 . The drilling tool according to any one of the preceding claims, characterised in that a radial depth of the plurality of groove sections is less than 1 mm, preferably less than 0.5 mm, in particular equal to about 0.1 mm. 
   
   
       11 . The drilling tool according to any one of the preceding claims, characterised in that a width of the plurality of groove sections is less than 1 mm, in particular equal to about 0.5 mm, 0.6 mm or 0.7 mm. 
   
   
       12 . The drilling tool according to any one of the preceding claims, characterised in that the plurality of groove sections lie interrupted by the at least one main helical groove on an auxiliary helical track, wherein the auxiliary helical track defined by the plurality of groove sections winds in particular in constant pitch substantially over then entire axial length of the cutting part. 
   
   
       13 . The drilling tool according to  claim 9 , characterised in that the auxiliary helical track forming the plurality of grooved sections substantially opens into the drilling end. 
   
   
       14 . The drilling tool according to any one of the preceding claims, characterised in that each groove section opens from a main helical groove edge into the opposing main helical groove edge. 
   
   
       15 . The drilling tool according to any one of the preceding claims, characterised in that the pitch direction of the auxiliary helical track is in the opposite direction to or preferably in the same direction as the pitch direction of the main helical groove.