US 12,465,980 B2
Coated cutting tool
Oscar Alm, Fagersta (SE); Hindrik Engstrom, Fagersta (SE); Tommy Larsson, Fagersta (SE); Jonas Lauridsen, Fagersta (SE); and Malin Rydert, Fagersta (SE)
Assigned to Seco Tools AB, Fagersta (SE)
Appl. No. 17/638,389
Filed by SECO TOOLS AB, Fagersta (SE)
PCT Filed Aug. 28, 2020, PCT No. PCT/EP2020/074112
§ 371(c)(1), (2) Date Feb. 25, 2022,
PCT Pub. No. WO2021/038060, PCT Pub. Date Mar. 4, 2021.
Claims priority of application No. 19194801 (EP), filed on Aug. 30, 2019.
Prior Publication US 2022/0288697 A1, Sep. 15, 2022
Int. Cl. B23B 27/14 (2006.01); B23B 1/00 (2006.01)
CPC B23B 27/148 (2013.01) [B23B 1/00 (2013.01); B23B 2228/105 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A coated cutting tool comprising:
a rake face;
a flank face;
a cutting edge region between and adjoining the flank face and the rake face in a nose area of a cutting tool insert, the cutting edge region being intersected by an edge line and defining a cutting edge sector that defines a cutting edge radius, re; and
a substrate with a coating having a thickness between 1 μm and 40 μm, where the coating includes an α-Al2O3 layer and an MTCVD TiCN layer located between the substrate and the α-Al2O3 layer, wherein the α-Al2O3 layer exhibits a texture coefficient TC(hkl), as measured by X-ray diffraction using CuKa radiation and θ-2θ scan, defined according to Harris formula

OG Complex Work Unit Math
where I(hkl) is the measured integrated area intensity of the (hkl) reflection with corresponding reference intensity I0(hkl), n is the number of reflections used in the calculation, the (hkl) reflections used are (1 0 4), (1 1 0), (1 1 3), (0 2 4), (1 1 6), (0 1 8), (3 0 0), (0 2 10), (0 0 12) and (0 1 14) and their corresponding reference intensities used are I0(1 0 4)=10000, I0(1 1 0)=4686, I0(1 1 3)=9734, I0(0 2 4)=4903, I0(1 1 6)=9562, I0(0 1 8)=724, I0(3 0 0)=5632, I0(0 2 10)=728, I0(0 0 12)=168 and I0(0 1 14)=448,
wherein the surface roughness, Ra, of the substrate on the flank face is Ra≥0.24 μm, as measured from a SEM image taken from a cross section in an area Sf of 1.1×1.1 mm2 at the nose of the flank face where said area Sf begins at a distance about 0.4 mm from the cutting edge region, the surface roughness of the substrate on the rake face is 0.05 μm<Ra<0.18 μm, as measured from a SEM image taken from a cross section in an area Sr of 1.1×1.1 mm2 at the nose of the rake face where said area Sr begins at a distance about 0.4 mm from the cutting edge region, the MTCVD TiCN layer exhibits a texture coefficient TC(hkl), as measured by X-ray diffraction using CuKa radiation and θ-2θ scan, defined according to Harris formula where
I(hkl) is the measured integrated area intensity of the (hkl) reflection with corresponding reference intensity I0(hkl), n is the number of reflections used in the calculation, the (hkl) reflections used are (1 1 1), (2 0 0), (2 2 0), (3 1 1), (3 3 1), (4 2 0), (4 2 2) and (5 1 1), and their corresponding reference intensities used are: I0(1 1 1)=7871, I0(2 0 0)=10000, I0(2 2 0)=5369, I0(3 1 1)=2550, I0(3 3 1)=1128, I0(4 2 0)=2366, I0(4 2 2)=2479, and I0(5 1 1)=1427, wherein TC(4 2 2) is ≥5.5 on the rake face as measured in area Sr,
wherein the α-Al2O3 layer exhibits a texture coefficient TC(0 0 12)≥8.5 on the rake face as measured in area Sr, and wherein the MTCVD TiCN layer on the flank face exhibits a TC(4 2 2)<3.5.