TREPANNING DRILL BIT WITH A SPIRAL-SHAPED DRILL SHAFT AND METHOD FOR PRODUCING A SPIRAL-SHAPED DRILL SHAFT FOR A DRILL BIT

摘要

A drill bit (10) for creating a wellbore (24) having a borehole diameter (d 2) and a core (23) having a core diameter (d 1) in a workpiece (22), comprising a cutting portion (11) having one or more cutting segments (11). 15), a drill shank portion (12) having a tubular drill shank (16), and a connection means (13) releasably or non-releasably connecting the cutting portion (11) and the drill shank portion (12), the tubular drill shank (16) being a welded spiral tube is trained.