Cutting tool and method for manufacturing cut product using same

Patent metadata

Field	Value
Publication number	US-10081065-B2
Application number	US-201415025844-A
Country	US
Kind code	B2
Filing date	Sep 30, 2014
Priority date	Sep 30, 2013
Publication date	Sep 25, 2018
Grant date	Sep 25, 2018

Abstract

A cutting tool such as a drill ( 1 ) in which a coating layer ( 6 ) is provided to the surface of a base body ( 5 ) having a rod shape, which is equipped with a cutting edge ( 2 ) provided to at least the tip portion (A) of the base body ( 5 ) having a rod shape and a chip discharge section ( 4 ) provided adjacent to the cutting edge ( 2 ) so as to extend rearwards (i.e., towards the rear end) from the tip portion (A), the coating layer ( 6 ) comprising a mixture phase of diamond and graphite and having a diamond content ratio which is lower in a rear end located 10 mm rearward from the tip than in the tip portion (A).

First claim

The invention claimed is:

1. A cutting tool with a rod shape and cutting edge, comprising:
a base body elongated in a direction with the cutting edge at an end, having a central rotation axis along the direction, rotatable along the central rotation axis, and comprising a tip portion at the cutting edge, the tip portion comprising:
a center portion including the central rotation axis in a tip side view; and
a peripheral portion outside of the center portion, including an outermost part of the tip portion in the tip side view; and

a coating layer disposed on the base body at the tip portion, and containing diamond,
wherein a first ratio is less than a second ratio, where the first ratio is a ratio of an SP3 peak intensity of a surface of the coating layer at the center portion to a total of SP2 and SP3 peak intensities in a Raman spectroscopy analysis, and the second ratio is a ratio of the SP3 peak intensity of the surface at the peripheral portion to the total.

2. The cutting tool according to claim 1 , wherein
the peaks originating from the diamond comprise a nanodiamond peak originating from nanodiamond at least at the center portion, and
a peak intensity ratio of the nanodiamond at the center portion is greater than a peak intensity ratio of the nanodiamond at the peripheral portion.

3. The cutting tool according to claim 1 , wherein
the peaks originating from the diamond comprise an SP2 peak originating from graphite at least at the center portion, and
a peak intensity ratio of the SP2 peak at the center portion is greater than a peak intensity ratio of the SP2 peak at the peripheral portion.

4. The cutting tool according to claim 1 , wherein a thickness of the coating layer at the tip portion of the base body is less than a thickness of the coating layer at a rearward portion of the base body.

5. A method for manufacturing a cut product, comprising the steps of:
rotating the cutting tool according to claim 1 about a rotation axis thereof;
bringing the cutting edge of the cutting tool that is rotating into contact with the workpiece; and
moving the cutting tool away from the workpiece.

Assignees

• Kyocera Corp

Inventors

• Waki Masahiro
• Imazato Mari
• Ka Tan

Classifications

• B23B2228/10

  Coatings · CPC title

• B23B51/02 Primary

  Twist drills · CPC title

• C23C16/271

  using hot filaments · CPC title

• C23C16/0254

  Physical treatment to alter the texture of the surface, e.g. scratching or polishing · CPC title

• B23B51/00 Primary

  Tools for drilling machines · CPC title