Surface-Coated Cutting Tool and Method of Manufacturing the Same

Patent metadata

Field	Value
Publication number	US-2020298317-A1
Application number	US-201816465852-A
Country	US
Kind code	A1
Filing date	Dec 14, 2018
Priority date	Mar 16, 2018
Publication date	Sep 24, 2020
Grant date	—

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 d 1 in the rake face. The TiCN layer has a (422) orientation in a region d 2 in the flank face.

First claim

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 rake face, the TiCN layer has a (422) orientation in a region d 2 in the flank 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
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(
hkl
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=

I
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hkl
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0

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hkl
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{

1
8

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x
,
y
,
z

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I
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(

h
x

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k
y

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l
z

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I
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1

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1
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where
I(hkl) and I(h x k y l z ) represent a measured diffraction intensity of a (hkl) plane and a measured diffraction intensity of a (h x k y l z ) plane, respectively,
I o (hkl) and I o (h x k y 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 y l z ) plane according to the JCPDS database, respectively, and
(hkl) and (h x k y 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 the (311) texture coefficient to a (422) texture coefficient in the region d 1 of the rake 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 according to claim 1 , wherein

Assignees

• Sumitomo Electric Hardmetal Corp

Inventors

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

Classifications

• C23C16/56

  After-treatment · CPC title

• C23C16/36

  Carbonitrides · CPC title

• B23B2228/10

  Coatings · CPC title

• B23B27/148 Primary

  Composition of the cutting inserts · CPC title

• C23C16/403

  of aluminium, magnesium or beryllium · CPC title