Surface-coated cutting tool

Patent metadata

Field	Value
Publication number	US-11059105-B2
Application number	US-201715779735-A
Country	US
Kind code	B2
Filing date	Sep 20, 2017
Priority date	Nov 29, 2016
Publication date	Jul 13, 2021
Grant date	Jul 13, 2021

Abstract

Provided is a surface-coated cutting tool including a base material and a coating including a super-multilayer-structure layer where A layers and B layers different from the A layers in composition are alternately laminated. The super-multilayer-structure layer includes an X area and a Y area those are alternately repeated. In the X area, A layers having a thickness A X and B layers having a thickness B X are alternately laminated. In the Y area, A layers having a thickness A Y and B layers having a thickness B Y are alternately laminated. The thickness A X is larger than the thickness A Y , and the thickness B X is smaller than the thickness B Y . Each of the A layers and the B layers comprising one or more elements selected from a group consisting of Ti, Al, Cr, Si, Ta, Nb, and W, and one or more elements selected from a group consisting of C and N.

First claim

The invention claimed is:

1. A surface-coated cutting tool comprising:
a base material; and
a coating covering a surface of the base material,
the coating including a super-multilayer-structure layer where A layers and B layers different from the A layers in composition are alternately laminated from a base material side to a surface side,
the super-multilayer-structure layer having a construction in which an X area and a Y area are alternately repeated from the base material side to the surface side, the X area being an area where A layers having a thickness A X and B layers having a thickness B X are alternately laminated, the Y area being an area where A layers having a thickness A Y and B layers having a thickness B Y are alternately laminated,
the thickness A X of the A layers being larger than the thickness A Y of the A layers,
the thickness B X of the B layers being smaller than the thickness B Y of the B layers,
each of the A layers and the B layers having a composition comprising one or more elements selected from a group consisting of Ti, Al, Cr, Si, Ta, Nb, and W, and one or more elements selected from a group consisting of C and N,
each of the A layers being a compound layer consisting of Al, Cr, and N,
each of the B layers being a compound layer consisting of Al, Ti, Si, and N,
wherein an XY area composed of the X area and the one Y area adjacent to the X area has a thickness of more than or equal to 88 nm and less than or equal to 300 nm.

2. A surface-coated cutting tool comprising:
a base material; and
a coating covering a surface of the base material,
the coating including a super-multilayer-structure layer where A layers and B layers different from the A layers in composition are alternately laminated from a base material side to a surface side,
the super-multilayer-structure layer having a construction in which an X area and a Y area are alternately repeated from the base material side to the surface side, the X area being an area where A layers having a thickness A X and B layers having a thickness B X are alternately laminated, the Y area being an area where A layers having a thickness A Y and B layers having a thickness B Y are alternately laminated,
the thickness A X of the A layers being larger than the thickness A Y of the A layers,
the thickness B X of the B layers being smaller than the thickness B Y of the B layers,
each of the A layers and the B layers having a composition comprising one or more elements selected from a group consisting of Ti, Al, Cr, Si, Ta, Nb, and W, and one or more elements selected from a group consisting of C and N,
each of the A layers being a compound layer consisting of Al, Cr, and N,
each of the B layers being a compound layer consisting of Al, Ti, Si, and N,
wherein on a coordinate system having a vertical axis representing a thickness and having a horizontal axis representing a distance from the base material for each layer constituting the super-multilayer-structure layer,
a graph A obtained by putting plots of the A layers included in the super-multilayer-structure layer and by connecting the plots with a straight line shows an angular pattern where a peak area and a valley area are alternately repeated, and
a graph B obtained by putting plots of the B layers included in the super-multilayer-structure layer and by connecting the plots with a straight line shows an angular pattern where a peak area and a valley area are alternately repeated, wherein
in the graph A, the A layers constituting the peak area are the A layers constituting the X area, and the A layers constituting the valley area are the A layers constituting the Y area,
in the graph B, the B layers constituting the peak area are the B layers constituting the Y area, and the B layers constituting the valley area are the B layers constituting the X area.

3. The surface-coated cutting tool according to claim 1 , wherein the XY area composed of the X area and the one Y area adjacent to the X area includes 4 to 10 A layers both inclusive and 4 to 10 B layers both inclusive.

4. The surface-coated cutting tool according to claim 1 , wherein each of the A layers and the B layers has a thickness of 0.5 nm to 30 nm both inclusive.

5. The surface-coated cutting tool according to claim 1 , wherein the super-multilayer-structure layer has a thickness of 1 μm to 20 μm both inclusive.

6. The surface-coated cutting tool according to claim 2 , wherein the XY area composed of the X area and the one Y area adjacent to the X area includes 4 to 10 A layers both inclusive and 4 to 10 B layers both inclusive.

7. The surface-coated cutting tool according to claim 2 , wherein each of the A layers and the B layers has a thickness of 0.5 nm to 30 nm both inclusive.

8. The surface-coated cutting tool according to claim 2 , wherein the super-multilayer-structure layer has a thickness of 1 μm to 20 μm both inclusive.

Assignees

• Sumitomo Electric Hardmetal Corp

Inventors

• Tanaka Keizo
• Setoyama Makoto
• Kobayashi Yutaka
• Kobayashi Akira

Classifications

• C23C14/0641 Primary

  Nitrides (C23C14/0617 takes precedence) · CPC title

• B23F21/00

  Tools specially adapted for use in machines for manufacturing gear teeth · CPC title

• B23B51/00

  Tools for drilling machines · CPC title

• C23C14/06

  characterised by the coating material ({C23C14/0021} , C23C14/04 take precedence) · CPC title

• B23B2224/08

  Aluminium nitride · CPC title