Surface-coated cutting tool and method of manufacturing the same

Patent metadata

Field	Value
Publication number	US-11213894-B2
Application number	US-201816465852-A
Country	US
Kind code	B2
Filing date	Dec 14, 2018
Priority date	Mar 16, 2018
Publication date	Jan 4, 2022
Grant date	Jan 4, 2022

Abstract

A surface-coated cutting tool includes a base material and a coating covering the base material. The base material includes a rake face and a flank face. The coating includes a TiCN layer. The TiCN layer has a (311) orientation in a region d1 in the rake face. The TiCN layer has a (422) orientation in a region d2 in the flank face.

First claim

The invention claimed is:

1. A surface-coated cutting tool comprising:
a base material; and
a coating covering the base material, wherein
the base material includes a rake face and a flank face,
the coating includes a TiCN layer,
the TiCN layer has a (311) orientation in a region d 1 in the flank face,
the TiCN layer has a (422) orientation in a region d 2 in the rake face,
when the rake face and the flank face are continuous with each other with a cutting edge face therebetween,
the region d 1 is a region sandwiched between an imaginary line D 1 and a boundary between the rake face and the cutting edge face, the imaginary line D 1 being 500 μm apart from an imaginary ridge line on the rake face, the imaginary ridge line being an intersection between a surface obtained by extending the rake face and a surface obtained by extending the flank face, and
the region d 2 is a region sandwiched between an imaginary line D 2 and a boundary between the flank face and the cutting edge face, the imaginary line D 2 being 500 μm apart from the imaginary ridge line on the flank face, and

when the rake face and the flank face are continuous with each other with a ridge line therebetween,
the region d 1 is a region sandwiched between the ridge line and an imaginary line D 1 which is 500 μm apart from the ridge line on the rake face, and
the region d 2 is a region sandwiched between the ridge line and an imaginary line D 2 which is 500 μm apart from the ridge line on the flank face.

2. The surface-coated cutting tool according to claim 1 , wherein
the TiCN layer having the (311) orientation means that, among texture coefficients TC (hkl) defined by equation (1) below, a texture coefficient TC (311) of a (311) plane in the TiCN layer is greater than a texture coefficient of any other crystal orientation plane, and
the TiCN layer having the (422) orientation means that, among the texture coefficients TC (hkl) defined by equation (1) below, a texture coefficient TC (422) of a (422) plane in the TiCN layer is greater than a texture coefficient of any other crystal orientation plane,

TC
⁡

(
hkl
)

=

I
⁡

(
hkl
)

I
0

⁡

(
hkl
)

⁢

{

1
8

⁢

∑

x
,
y
,
z

⁢

I
⁡

(

h
x

⁢

k
y

⁢

l
z

)

I
0

⁡

(

h
x

⁢

k
y

⁢

l
z

)

}

-
1

(
1
)

where
I(hkl) and I(h x k v l z ) represent a measured diffraction intensity of a (hkl) plane and a measured diffraction intensity of a (h x k v l z ) plane, respectively,
I 0 (hkl) and I 0 (h x k v l z ) represent an average value of powder diffraction intensities of TiC and TiN of a (hkl) plane according to a JCPDS database and an average value of powder diffraction intensities of TiC and TiN of a (h x k v l z ) plane according to the JCPDS database, respectively, and
(hkl) and (h x k v l z ) each represent any one of eight planes including a (111) plane, a (200) plane, a (220) plane, a (311) plane, a (331) plane, a (420) plane, a (422) plane, and a (511) plane.

3. The surface-coated cutting tool according to claim 2 , wherein a ratio TC rake (311)/TC rake (422) of a (311) texture coefficient to a (422) texture coefficient in the region d 1 of the flank face is greater than 1.

4. The surface-coated cutting tool according to claim 2 , wherein a ratio TC rake (422)/TC flank (422) of a (422) texture coefficient in the region d 1 of the rake face to a (422) texture coefficient in the region d 2 of the flank face is not greater than 1.

5. The surface-coated cutting tool according to claim 1 , wherein the TiCN layer has a thickness of not less than 6 μm and not greater than 10 μm.

6. The surface-coated cutting tool accordin

Assignees

• Sumitomo Electric Hardmetal Corp

Inventors

• Ono Satoshi
• Imamura Shinya
• Okuno Susumu
• Paseuth Anongsack

Classifications

• C23C28/042

  including a refractory ceramic layer, e.g. refractory metal oxides, ZrO2, rare earth oxides · CPC title

• B23B27/141

  Specially shaped plate-like cutting inserts, i.e. length greater or equal to width, width greater than or equal to thickness (with specially shaped plate-like exchangeable cutting inserts, e.g. chip-breaking groove, B23B27/1603; with removable plate-like milling cutting inserts of special shape B23C5/202) · CPC title

• C23C16/56

  After-treatment · CPC title

• B23B51/00

  Tools for drilling machines · CPC title

• C23C16/36

  Carbonitrides · CPC title