Method for making a cone for a rock bit and product

摘要: A method is provided for manufacturing tungsten carbide insert-type cutter cones a rock bit drilling oil wells and the like. cone blank formed from medium to high carbon steel by forging machining. The has generally conical external surface, cylindrical internal bearing cavity, circumferentially extending ball race in cavity. heat treated quenching tempering desired core hardness. Insert holes are drilled surface of insertion inserts. selectively hardened heating forming layer having higher hardness than Selective hardening obtained applying energy induction heating, an electron beam or laser austenitize which rapidly cooled hardening.