| 摘要 |
PROBLEM TO BE SOLVED: To provide a cutting tool made of WC-based cemented carbide, capable of achieving excellent chipping resistance in high-speed intermittent heavy cutting work in which high heat is generated, with large mechanical impact loads added repeatedly. SOLUTION: The cutting tool made of surface-coated WC-based cemented carbide comprises a base member of WC-based cemented carbide having an average composition of 5-12% Co, 0.02-0.2% S, carbide-converted values of 1-5% TiC, 1-5% for one kind or two kinds of TaC and NbC, all in mass%, with WC for the rest. The inner side of the base member is substantially composed of a first hard phase comprising WC, a second hard phase comprising composite carbide solid solution and/or composite carbonitride solid solution of Ti, Ta and/or Nb and W, a dendritic carbosulfide precipitation phase, a binder phase, and unavoidable impurities. The surface side of the base member is composed of the first hard phase and the binder phase substantially, including less than 0.02% S. COPYRIGHT: (C)2009,JPO&INPIT
|
