CUTTING TOOL OF SINTERED BODY HIGH IN HARDNESS

摘要

PURPOSE:To prevent the local abrasion of a cutting edge part of a cutting tool consisting of cubic crystal boron nitride(CBN) sintered body, and improve the life of the tool. CONSTITUTION:A cutting edge part is constituted of a first and the second sintered body layers 11 and 12. The first sintered body layer 11 contains 75-98vol% CBN, and the rest consists of the first bonding agent. The second sintered body layer 12 is joined with the first sintered body layer, and contains 40-65vol% CBN, and the rest consists of the second bonding agent. The main surface of the first sintered body layer 11 constitutes a rake face. The thickness of the first sintered body layer 11 is 0.04-0.2mm.