Fremgangsmåde til fremstilling af drejeboreværktøj

摘要

The process involves forging a blank to produce feed threads (3). These threads are made in a region of the blank extending between the insertion end (2) and a head zone (3). The head zone is recessed from the threads. Its axial extent is at least 10% of the maximum diameter of the bit in the feed thread zone. The thread free head zone may have a diameter which is more or less the same as that of the bit in the threaded zone. This diameter may be reduced in places. The head zone may be shaped so that it has at least two surfaces which are opposite and parallel to each other.