A method for manufacturing small diameter hardened piercing tools has a cylindrical shaft and head with a hard cap soldered together prior to machining

摘要

The tool blank comprises a shaft (3) with a top surface (11) perpendicular to the axis (13) and having one or more grooves (15) crossing the centre and a head piece (5) having a corresponding face (17) by which it is soldered to the shaft and an upper surface (23) to which a hardened cap (21) is fitted prior to a machining operation.