Diamond-coated tool and method of manufacturing diamond-coated tool

Patent metadata

Field	Value
Publication number	US-12533736-B2
Application number	US-202017773226-A
Country	US
Kind code	B2
Filing date	Oct 9, 2020
Priority date	Nov 8, 2019
Publication date	Jan 27, 2026
Grant date	Jan 27, 2026

Abstract

In a diamond-coated tool provided with a blade which includes a base material and a diamond layer formed on the base material, when a length of the blade along an extending direction thereof is denoted by L, and a thickness of the diamond layer of the blade is measured at a total number of 11 points which are arranged from one end of the blade along the extending direction thereof and separated from each other at an interval of L/10, the thickness is the same at all of the 11 points, or a ratio d min /d max between a minimum value d min of the thickness and a maximum value d max of the thickness is 0.7 or more and less than 1.

First claim

The invention claimed is:

1 . A diamond-coated tool provided with a blade which includes a base material and a diamond layer formed on the base material,
wherein a length of the blade along an extending direction thereof is denoted by L, and a thickness of the diamond layer of the blade is measured at a total number of 11 points which are arranged from one end of the blade along the extending direction thereof and separated from each other at an interval of L/10, the thickness being the same at all of the 11 points, or a ratio d min /d max between a minimum value d min of the thickness and a maximum value d max of the thickness being 0.7 or more and less than 1, and wherein a Raman spectrum of the diamond layer in the range of Raman shift 900 cm −1 to 2000 cm −1 is measured at a first point where the thickness has a minimum value d min and a second point where the thickness has a maximum value d max , a ratio I min /I max between I min , which is a ratio Id min /Is min at the first point between a peak area intensity Id min of diamond and an area intensity Is min of the entire spectrum, and I max , which is a ratio Id max /Is max at the second point between a peak area intensity Id max of diamond and an area intensity Is max of the entire spectrum, is 0.7 or more and 1 or less.

2 . The diamond-coated tool according to claim 1 , wherein
the ratio d min /d max is 0.85 or more and less than 1.

3 . The diamond-coated tool according to claim 1 , wherein
a C1s spectrum of the diamond layer is measured by X-ray photoelectron spectroscopy at a first point where the thickness has a minimum value d min and a second point where the thickness has a maximum value d max , a ratio Ix min /Ix max between Ix min , which is a ratio I3 min /I2 min at the first point between a peak area intensity I3 min of sp3 carbon and a peak area intensity 12 min of sp2 carbon, and Ix max , which is a ratio I3 max /I2 max at the second point between a peak area intensity I3 max of sp3 carbon and a peak area intensity I2 max of sp2 carbon, is 0.7 or more and 1 or less.

4 . The diamond-coated tool according to claim 1 , wherein
an average particle diameter of the diamond layer is measured by electron backscatter diffraction at a first point where the thickness has a minimum value d min and a second point where the thickness has a maximum value d max , a ratio D min /D max between the average particle diameter D min at the first point and the average particle diameter D max at the second point is 0.7 or more and 1 or less.

5 . The diamond-coated tool according to claim 1 , wherein
a surface roughness Ra of the diamond layer is measured with a laser microscope at a first point where the thickness has a minimum value d min and a second point where the thickness has a maximum value d max , a ratio R min /R max between a surface roughness R min at the first point and a surface roughness R max at the second point is 0.7 or more and 1 or less.

6 . A method of manufacturing a diamond-coated tool according to claim 1 , the method comprising:
preparing a base material; and forming a diamond layer on the base material by a hot filament CVD process to obtain a diamond-coated tool, the hot filament CVD process being performed in such a manner that the temperature distribution in a blade of the base material where a cutting edge is formed is controlled within 5%.

7 . The diamond-coated tool according to claim 1 , wherein
the ratio d min /d max is 0.7 or more and less than 0.95.

Assignees

• Sumitomo Electric Hardmetal Corp

Inventors

• Sugimoto Rintaro
• Harada Takashi
• Yoshida Minoru

Classifications

• B23C2228/10

  Coating · CPC title

• B23C5/16 Primary

  characterised by physical features other than shape · CPC title

• C23C16/458

  characterised by the method used for supporting substrates in the reaction chamber · CPC title

• B23C2265/08

  Conical · CPC title

• B23H1/00

  Electrical discharge machining, i.e. removing metal with a series of rapidly recurring electrical discharges between an electrode and a workpiece in the presence of a fluid dielectric · CPC title