Surface-coated cutting tool and method of manufacturing the same

Patent metadata

Field	Value
Publication number	US-9849517-B2
Application number	US-201515102992-A
Country	US
Kind code	B2
Filing date	Oct 9, 2015
Priority date	Oct 9, 2015
Publication date	Dec 26, 2017
Grant date	Dec 26, 2017

Abstract

A surface-coated cutting tool includes a base material and a coating formed on the base material. The coating includes an α-Al 2 O 3 layer containing a plurality of α-Al 2 O 3 crystal grains. The α-Al 2 O 3 layer includes: a first region made up of an edge ridgeline, a region A of a rake face, and a region B of a flank face; a second region which is a region of the rake face except for the region A and covered with the coating; and a third region which is a region of the flank face except for the region B. The α-Al 2 O 3 layer satisfies a relation b−a>0.5, where a is an average value of a TC(006) in the first region in texture coefficient TC(hkl) and b is an average value of the TC(006) in the second region or the third region in texture coefficient TC(hkl).

First claim

The invention claimed is:

1. A surface-coated cutting tool having a rake face, a flank face, and an edge ridgeline constituting a boundary between the rake face and the flank face,
the surface-coated cutting tool comprising a base material and a coating formed on the base material,
the coating including an α-Al 2 O 3 layer containing a plurality of α-Al 2 O 3 crystal grains,
the α-Al 2 O 3 layer including:
a first region made up of the edge ridgeline, a region A of the rake face, and a region B of the flank face;
a second region which is a region of the rake face except for the region A and covered with the coating; and
a third region which is a region of the flank face except for the region B,

the region A being sandwiched between the edge ridgeline and a virtual line in the rake face, the virtual line passing through a point located 1 mm away from the edge ridgeline and extending along the edge ridgeline,
the region B being sandwiched between the edge ridgeline and a virtual line in the flank face, the virtual line passing through a point located 1 mm away from the edge ridgeline and extending along the edge ridgeline, and
the α-Al 2 O 3 layer satisfying a relation b−a>0.5, where a is an average value of a TC(006) in the first region in texture coefficient TC(hkl) and b is an average value of the TC(006) in the second region or the third region in texture coefficient TC(hkl).

2. The surface-coated cutting tool according to claim 1 , wherein
the a satisfies a relation 0.01<a<7, and
the b satisfies a relation 7<b<8.

3. The surface-coated cutting tool according to claim 1 , wherein
the α-Al 2 O 3 layer satisfies a relation between a and c: 0.05<c/a<1, where c is an average value of a TC(104) in the first region in texture coefficient TC(hkl).

4. A method of manufacturing a surface-coated cutting tool as recited in claim 1 , the method comprising the steps of:
forming the coating on the base material; and
performing surface treatment on a portion of the coating, the portion corresponding to the first region.

5. The method of manufacturing a surface-coated cutting tool according to claim 4 , wherein
the surface treatment includes at least brushing or blasting.

Assignees

• Sumitomo Electric Hardmetal Corp

Inventors

• Detani Takanori
• Imamura Shinya
• Kanaoka Hideaki
• Paseuth Anongsack

Classifications

• C23C16/56

  After-treatment · CPC title

• C23C16/403 Primary

  of aluminium, magnesium or beryllium · CPC title

• C23C16/347

  Carbon nitride · CPC title

• C23C16/04

  Coating on selected surface areas, e.g. using masks · CPC title

• B23C2228/10

  Coating · CPC title