Throw-away tip

Patent metadata

Field	Value
Publication number	US-10286455-B2
Application number	US-201515027394-A
Country	US
Kind code	B2
Filing date	Jul 31, 2015
Priority date	Sep 5, 2014
Publication date	May 14, 2019
Grant date	May 14, 2019

Abstract

There is provided a throw-away tip which includes a blade containing diamond and is excellent in chip processability. The throw-away tip comprises a body and a blade provided to the body and having a cutting edge, the blade containing 80% by volume or more of diamond, the blade having a land surface extending along the cutting edge, and a chip breaker having a recess located opposite to the cutting edge with the land surface therebetween, the recess having a side surface having an inclined surface that recedes continuously as a distance thereof from the land surface increases in magnitude and that has a shape identical to that of a portion of a side surface of a shape of a body of revolution.

First claim

The invention claimed is:

1. A throw-away tip comprising a body and a blade provided to the body and having a cutting edge,
the blade containing 80% by volume or more of diamond,
the blade having a land surface extending along the cutting edge, and a chip breaker having a recess located opposite to the cutting edge with the land surface therebetween,
the recess having a side surface having a rake face that recedes continuously from the land surface as a distance toward a center of the blade increases in magnitude, wherein
the rake face has a shape identical to a portion of a side surface of a cone;
the blade has a corner;
the recess has on the side surface of the recess a projection formed along a bisector of an angle of the corner;
the projection has a height in a range of 20% or more and 80% or less relative to a maximum depth of the recess;
the maximum depth of the recess is a maximum value of a distance to a bottom of the recess from a plane assumed when the land surface is extended to above the recess; and
the cone has an axis on the bisector of the angle of the corner of the blade.

2. The throw-away tip according to claim 1 , wherein an angle of inclination of the rake face relative to the land surface is in a range of 15° or more and 50° or less.

3. The throw-away tip according to claim 1 , wherein the land surface has a width in a direction perpendicular to the cutting edge in a range of 10 μm or more and 100 μm or less.

4. The throw-away tip according to claim 1 , wherein the recess has a maximum depth in a range of 60 μm or more and 300 μm or less.

5. The throw-away tip according to claim 1 , wherein the recess has a width in a direction perpendicular to the cutting edge in a range of 0.2 mm or more and 1.0 mm or less.

6. The throw-away tip according to claim 1 , wherein when the projection is seen in a cross section to which the bisector of the angle of the corner is a normal, the projection has a cross sectional shape increasing in width as the recess becomes deeper; and
the cross sectional shape in a widthwise direction has a minimum value in a range of 5 μm or more and 40 μm or less.

7. The throw-away tip according to claim 1 , wherein the projection has a length in a direction along the bisector of the angle of the corner in a range of 0.2 mm or more and 1.0 mm or less.

8. The throw-away tip according to claim 1 , wherein:
the land surface has a surface roughness in a range of 0.05 μm or more and 0.2 μm or less; and
the rake face has a surface roughness in a range of 2 μm or more and 7 μm or less.

9. The throw-away tip according to claim 1 , wherein the diamond is single crystal diamond synthesized by vapor deposition.

10. The throw-away tip according to claim 9 , wherein the single crystal diamond has an absorption coefficient in a range of 2 cm −1 or more and 90 cm −1 or less for laser light of 190 μm or more and 11000 μm or less in wavelength.

11. The throw-away tip according to claim 1 , wherein the land surface, the rake face, the projection, a breaker wall surface, and an upper surface are arranged in order along the bisector,
and
wherein a width of the rake face along the bisector is larger than a width of the breaker wall surface along the bisector.

12. The throw-away tip according to claim 1 , wherein the land surface, the rake face, the projection, a breaker wall surface, and an upper surface are arranged in order along the bisector,
and
wherein a width of the rake face and the breaker wall surface along the bisector is greater than a width of the land surface along the bisector.

13. The throw-away tip according to claim 1 , wherein the rake face is linear along the bisector.

Assignees

• Sumitomo Electric Hardmetal Corp

Inventors

• Tomoda Yuji
• Kanada Yasuyuki
• Tanaka Kunishige

Classifications

• B23B2226/315

  polycrystalline [PCD] · CPC title

• B23B27/20 Primary

  with diamond bits {or cutting inserts} · CPC title

• B23B27/143 Primary

  characterised by having chip-breakers · CPC title

• B23B2228/04

  applied by chemical vapour deposition [CVD] · CPC title

• B23B2226/31

  Diamond · CPC title