Cutting tool

Patent metadata

Field	Value
Publication number	US-2018311748-A1
Application number	US-201815960940-A
Country	US
Kind code	A1
Filing date	Apr 24, 2018
Priority date	Apr 27, 2017
Publication date	Nov 1, 2018
Grant date	—

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 having a first end and a second end, the tool body having a longitudinal axis extending between the first end and the second end, the first end comprising two or more cutting portions,
wherein each of the cutting portions comprises:
a cutting edge extending radially outwardly from a centre 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,

characterised in that 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.

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 extending radially across the flank surface, the first row positioned adjacent to a circumferentially trailing edge of the flank surface, the second row being radially offset from the first row.

5 . The cutting tool as claimed in claim 1 , wherein each abrasive feature extends from the flank surface by a feature height, the feature height increasing with radially distal feature position.

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

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

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

9 . 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.

10 . 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 is provided with a coating layer selected from the group consisting of diamond materials and cubic boron nitride materials.

11 . A method of forming a cutting tool, the method comprising the steps of:
providing a tool body having a first end, a second end, and a longitudinal axis extending from the first end to the second end; forming two or more cutting portions at the first end, each cutting portion comprising a cutting edge and a flank surface, each cutting edge extending radially outwardly from a centre 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 cutting edge;
characterised in that the method comprises the further step of:
forming an abrasive portion over at least a part of each of at least two of the two or more of the flank surfaces, with each abrasive portion comprising a plurality of abrasive features.

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

13 . The method as claimed in claim 11 , wherein the tool body is formed from a diamond material, and the step of forming an abrasive portion over at least a part of each of at least two of the two or more of the flank surfaces, comprises the step of:
selectively creating (i.e. 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.

14 . The method as claimed in claim 11 , wherein each abrasive feature extends from the flank surface by a feature height, the feature height increasing with radially distal feature position.

15 . The cutting tool as claimed in claim 14 , wherein the feature height of each abrasive feature is equal to the corresponding depth of the cut along the cutting edge.

Assignees

• Rolls Royce Plc

Inventors

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

Classifications

• B23B2226/125

  cubic [CBN] · CPC title

• B23P15/28

  cutting tools (sawing tools B23D63/00, B23D65/00; files or rasps B23D73/00) · CPC title

• B23B51/08 Primary

  Drills combined with tool parts or tools for performing additional working {(B23G5/20 takes precedence)} · CPC title

• B28D1/146

  Tools therefor (drill bits for earth or rock drilling E21B10/00) · CPC title

• B23B2251/285

  Cutting teeth arranged at different heights · CPC title