Brazing receptacle for improved PCD cutter retention

摘要

Thin walled metal alloy receptacles 26 are filled with a filler material. If granular, the filler material is solidified in the receptacles. The receptacles 26 are inserted in a bit mould with their open ends abutting against preformed cutter locations in the bit mould. The mould is filled with a steel or tungsten carbide powder and a binder and exposed to temperatures sufficient to cause the binder to infiltrate the steel or tungsten carbide as well as infiltrate the receptacle outer surfaces, metallurgically bonding the receptacles to the binder. The mould is then removed, revealing a bit body with the bonded filled receptacles. The filler material is removed from the receptacles. PCD cutters 12 are then inserted in the receptacles 26 and are brazed (34) using conventional brazing techniques.