| 摘要 |
PROBLEM TO BE SOLVED: To provide an end mill made of surface-coated cemented carbide excellent in wear resistance in high speed cutting. SOLUTION: A super hard substrate consists of a sintered body of a green compact having a formulation composition consisting of, in mass %, Co: 5 to 15%, Cr3C2: 0.1 to 2%, VC: 0.1 to 2%, one kind or more out of TiC, NbC, Tac, (Nb, Ta) C, and (Ti, W) C according to necessity: 5 to 25%, WC: the rest. The coated cemented carbide end mill consists of the super hard substrate whose surface is constituted of hard coating layers (a) as an inside layer, (Ti, Al) N layer with 0.5 to 3μm average layer thickness having a composition formula formed with a physical vapor deposition method: (Ti1-XAlX) N (X represents 0.2 to 0.6 in an atomic ratio) and (b) as an outside layer,κtype Al2O3 layer with 0.1 to 3μm average layer thickness and formed with an intermediate temperature chemical vapor deposition method.
|
