Cutting tool

Patent metadata

Field	Value
Publication number	US-10618120-B2
Application number	US-201815960940-A
Country	US
Kind code	B2
Filing date	Apr 24, 2018
Priority date	Apr 27, 2017
Publication date	Apr 14, 2020
Grant date	Apr 14, 2020

Abstract

A cutting tool comprises a tool body having a first end and a second end, and a longitudinal axis extending between the first end and the second end. The first end comprises two or more cutting portions, with each of the cutting portions comprising a cutting edge and a flank surface.
Each cutting edge extends radially outwardly from a centre region of the first end to a perimetral edge of the first end, with the cutting edge being angled relative to the longitudinal axis. Each flank surface extends circumferentially from the cutting edge.
Each of at least two of the two or more flank surfaces comprises an abrasive portion extending over at least a part of the respective flank surface and each abrasive portion comprises a plurality of abrasive features.

First claim

What is claimed is:

1. A cutting tool comprising:
a tool body including a longitudinal axis extending between a first end and a second end, the first end including a plurality of cutting portions, each cutting portion of the plurality of cutting portions including:
a cutting edge extending radially outwardly from a center region of the first end to a perimetral edge of the first end, the cutting edge being angled relative to the longitudinal axis, and
a flank surface extending circumferentially from the cutting edge and including an abrasive portion with a plurality of abrasive features, the plurality of abrasive features having a feature height offset with respect to a height of the cutting edge such that the cutting edge is configured to cut a first layer of a material and the plurality of abrasive features are configured to cut a second layer of the material, which is different from the first layer, and the feature height of each abrasive feature of the plurality of abrasive features increases as a distance of each abrasive feature from the center region increases in a radial direction of the first end.

2. The cutting tool as claimed in claim 1 , wherein the abrasive features have a circular profile.

3. The cutting tool as claimed in claim 1 , wherein the abrasive features extend from the flank surface as conical frusta.

4. The cutting tool as claimed in claim 1 , wherein the abrasive features are arranged in two adjacent rows across the flank surface, each row of the two adjacent rows extending radially across the flank surface, a first row of the two adjacent rows being positioned adjacent to a circumferentially trailing edge of the flank surface, and a second row of the two adjacent rows being radially offset from the first row.

5. The cutting tool as claimed in claim 1 , wherein the feature height of each abrasive feature of the plurality of abrasive features is equal to a corresponding depth of cut along the cutting edge.

6. The cutting tool as claimed in claim 1 , wherein each cutting edge extends linearly from the center region of the first end to the perimetral edge of the first end, each cutting edge subtending a first angle relative to the longitudinal axis.

7. The cutting tool as claimed in claim 1 , further comprising two or more flutes extending along at least a part of the tool body, wherein each of two or more cutting edges of the plurality of cutting edges corresponds to a respective one of the two or more flutes.

8. The cutting tool as claimed in claim 1 , wherein the cutting tool is integrally formed from a material selected from the group consisting of diamond materials and cubic boron nitride materials.

9. The cutting tool as claimed in claim 1 , wherein the cutting tool is formed from a base material selected from the group consisting of steel, titanium, and carbide materials, and the base material has a coating layer selected from the group consisting of diamond materials and cubic boron nitride materials.

10. A method of forming a cutting tool, the method comprising:
providing a tool body including a longitudinal axis extending from a first end to a second end;
forming two or more cutting portions at the first end, each cutting portion including a cutting edge and a flank surface, each cutting edge extending radially outwardly from a center region of the first end to a perimetral edge of the first end, the cutting edge being angled relative to the longitudinal axis, and each flank surface extending circumferentially from the respective cutting edge; and
forming an abrasive portion over at least a part of each of at least two of the two or more of the flank surfaces, each abrasive portion including a plurality of abrasive features, the plurality of abrasive features having a feature height offset with respect to a height of the cutting edge such that the cutting edge is configured to cut a first layer of a material and the plurality of abrasive features are configured to cut a second layer of the material, which is different from the first layer, the feature height of each abrasive feature of the plurality of abrasive features increases as a distance of each abrasive feature from the center region increases in a radial direction of the first end.

11. The method as claimed in claim 10 , wherein forming two or more cutting portions at the first end includes forming two or more twisted flutes along the tool body, each twisted flute corresponding to a respective cutting portion of the two or more cutting portions, each flute of the two or more twisted flutes extending from the perimetral edge of the first end along at least a part of the tool body.

12. The method as claimed in claim 10 , wherein:
the tool body is formed from a diamond material, and
forming an abrasive portion over at least a part of each of at least two of the two or more of the flank surfaces includes selectively creating by laser ablating, electro-discharge machining, electroplating or brazing, a part of the flank surface on at least two of the two or more of the flank surfaces to generate a plurality of abrasive features extending from the flank surface.

13. The method as claimed in claim 10 , wherein the feature height of each abrasive feature is equal to a corresponding depth of cut along the cutting edge.

Assignees

• Rolls Royce Plc

Inventors

• NOVOVIC Donka
• Gavalda Diaz Oriol
• Axinte Dragos A
• Butler-Smith Paul

Classifications

• B23B2226/31

  Diamond · CPC title

• B23B2200/123

  curved · CPC title

• B23B2200/28

  Angles · CPC title

• B23P15/32

  twist-drills · CPC title

• Y10T408/81

  Tool having crystalline cutting edge · CPC title