Cutting tool, manufacturing method for cutting tool, and method for manufacturing cut product using cutting tool

Patent metadata

Field	Value
Publication number	US-2016167139-A1
Application number	US-201414906807-A
Country	US
Kind code	A1
Filing date	Jul 16, 2014
Priority date	Jul 22, 2013
Publication date	Jun 16, 2016
Grant date	—

Abstract

A cutting tool based on an embodiment of the present invention is provided with a cylindrical main body section which is made of a cobalt-containing cemented carbide alloy and is rotatable about the central axis thereof, a cutting edge which is provided at at least one of the tip and the periphery of the main body section, a chip discharge groove which extends from the cutting edge toward the rear end of the main body section, and a coating layer which is made of diamond and covers the cutting edge, wherein the cobalt content of the surface of the main body section at the part coated with the coating layer is less than the cobalt content of the surface of the main body section at parts other than the part coated with the coating layer.

First claim

1 . A cutting tool comprising:
a main body section with a cylindrical shape which is made of a cobalt-containing cemented carbide alloy and is rotatable about a central axis thereof; a cutting edge which is provided at at least one of a tip and a periphery of the main body section; a chip discharge groove which extends from the cutting edge toward a rear end of the main body section; and a coating layer which is made of diamond and coats the cutting edge, wherein a surface of the main body section comprises a coated surface that is coated with the coating layer and an uncoated surface that is not coated with the coating layer, wherein a cobalt content of the coated surface of the main body section is within the range of 0.01 mass % to 1 mass %, and is less than a cobalt content of the uncoated surface of the main body section.

2 . The cutting tool according to claim 1 ,
wherein the chip discharge groove includes:
a first region which is located adjacent to the cutting edge and is coated with the coating layer, and
a second region which extends from the first region toward the rear end of the main body section and is not coated with the coating layer.

3 . The cutting tool according to claim 2 ,
wherein a region other than the chip discharge groove at the periphery of the main body section includes:
a third region which is located on the tip side and is coated with the coating layer, and
a fourth region which extends from the third region toward the rear end of the main body section and is not coated with the coating layer.

4 . A cutting tool comprising:
a main body section with a cylindrical shape which is made of a cemented carbide alloy and is rotatable about a central axis thereof; a cutting edge which is provided at at least one of a tip and a periphery of the main body section; a chip discharge groove which extends from the cutting edge toward a rear end of the main body section; a first coating layer which is made of diamond and coats the cutting edge; and a second coating layer which is made of a chromium-containing non-oxide and coats a surface of the main body section other than a part coated with the first coating layer.

5 . A manufacturing method for a cutting tool, the method comprising the steps of:
forming a cutting edge at at least one of a tip and a periphery of a cylindrical main body section which is made of a cobalt-containing cemented carbide alloy and is rotatable about a central axis thereof, and forming a chip discharge groove which extends from the cutting edge toward a rear end of the main body section; coating a surface of the main body section with a second coating layer which is made of a chromium-containing non-oxide; partially removing the second coating layer to expose a tip region including the cutting edge; eluting and removing cobalt from the exposed tip region by carrying out chemical treatment on the main body section; and forming a first coating layer which is made of diamond on a surface of the region from which the cobalt is removed on the main body section on which the chemical treatment is carried out.

6 . The manufacturing method for a cutting tool according to claim 5 ,
wherein, in the step of partially removing the second coating layer, only a region adjacent to the cutting edge in the chip discharge groove is exposed.

7 . The manufacturing method for a cutting tool according to claim 6 ,
wherein, in the step of partially removing the second coating layer, a tip side of a region other than the chip discharge groove at the periphery of the main body section is exposed.

8 . The manufacturing method for a cutting tool according to claim 5 ,
wherein, in the step of partially removing the second coating layer, the second coating layer is removed by a polishing process.

9 . The manufacturing method for a cutting tool according to claim 5 , further comprising the step of:
removing all of the second coating layer after the step of forming the first coating layer.

10 . A method for manufacturing a cut product, the method comprising the steps of:
rotating the cutting tool according to claim 1 about the central axis; bringing the cutting edge of the rotating cutting tool into contact with a work material; and separating the cutting tool from the work material.

Assignees

• Kyocera Corp

Inventors

• Ogawa Hiroshi

Classifications

• Y10T408/81

  Tool having crystalline cutting edge · CPC title

• Y10T408/78

  Tool of specific diverse material · CPC title

• C23G1/20

  Other heavy metals · CPC title

• C23F1/00

  Etching metallic material by chemical means (manufacture of printing surfaces B41C; manufacture of printed circuits H05K) · CPC title

• C23C30/005

  on hard metal substrates · CPC title