Coated tool, cutting tool, and method for manufacturing machined product

Patent metadata

Field	Value
Publication number	US-2020122239-A1
Application number	US-201816626889-A
Country	US
Kind code	A1
Filing date	Jun 20, 2018
Priority date	Jun 29, 2017
Publication date	Apr 23, 2020
Grant date	—

Abstract

A coated tool may include a base member having a first surface and a coating layer may be located on the first surface. The coating layer may include a first layer having a plurality of α-Al 2 O 3 crystal particles. At least one of the α-Al 2 O 3 crystal particles has at least two regions with different orientations from each other.

First claim

1 . A coated tool, comprising:
a base member comprising a first surface; and a coating layer located on the first surface; wherein the coating layer comprises a first layer comprising a plurality of α-Al 2 O 3 crystal particles; and at least one of the α-Al 2 O 3 crystal particles comprises at least two regions with different orientations from each other.

2 . The coated tool according to claim 1 , wherein the at least one of the α-Al 2 O 3 crystal particles comprises three or more regions with different oriented regions from each other.

3 . The coated tool according to claim 1 , wherein a boundary between the different oriented regions of the at least one of the α-Al 2 O 3 crystal particles extends along a thickness direction of the first layer.

4 . The coated tool according to claim 3 , wherein
the first layer comprises: a surface A facing the base member; and a surface B located on an opposite side of the surface A; and at least one of the α-Al 2 O 3 crystal particles comprising at least two regions with different orientations is located from the surface A to the surface B.

5 . The coated tool according to claim 1 , wherein the first layer comprises a part where a plurality of α-Al 2 O 3 crystal particles comprising at least two regions with different orientations are adjacent to each other.

6 . The coated tool according to claim 5 , wherein the plurality of α-Al 2 O 3 crystal particles comprising at least two regions with different orientations are adjacent to each other along a thickness direction of the first layer.

7 . The coated tool according to claim 5 , wherein the plurality of α-Al 2 O 3 crystal particles comprising at least two regions with different orientations are adjacent to each other along a direction orthogonal to a thickness direction of the first layer.

8 . The coated tool according to claim 1 , wherein a mean particle diameter of the at least one of the α-Al 2 O 3 crystal particles comprising at least two regions with different orientations is larger than a mean particle diameter of a set of crystal particles other than the at least one α-Al 2 O 3 crystal particles comprising at least two regions with different orientations.

9 . The coated tool according to claim 1 , wherein a boundary between the at least two regions with different orientations is a Σ3-type crystal grain boundary.

10 . A cutting tool, comprising:
a holder comprising a pocket located at a front end side; and the coated tool according to claim 1 , which is located at the pocket.

11 . A method for manufacturing a machined product, comprising:
rotating the cutting tool according to claim 10 ; bringing the cutting tool being rotated into contact with a workpiece; and moving the cutting tool away from the workpiece.

12 . The coated tool according to claim 6 , wherein the plurality of Al 2 O 3 crystal particles comprising at least two regions with different orientations are adjacent to each other along a direction orthogonal to a thickness direction of the first layer.

Assignees

• Kyocera Corp

Inventors

• Kodama Yoshikazu
• Kumai Kenji
• Sugawa Yuusaku

Classifications

• C23C16/40

  Oxides · CPC title

• B23C5/16

  characterised by physical features other than shape · CPC title

• B23B27/14 Primary

  Cutting tools of which the bits or tips {or cutting inserts} are of special material · CPC title

• C23C16/403 Primary

  of aluminium, magnesium or beryllium · CPC title