Cutting pick tool

Patent metadata

Field	Value
Publication number	US-9605538-B2
Application number	US-201514594358-A
Country	US
Kind code	B2
Filing date	Jan 12, 2015
Priority date	Jan 13, 2014
Publication date	Mar 28, 2017
Grant date	Mar 28, 2017

Abstract

A cutting pick tool including a cemented carbide support body that mounts a diamond composite cutting tip. The support body includes a recess having a conical region that mounts a complementary conical shaped mount portion of the tip. The components are brazed together to provide a secure and robust cutting tip region.

First claim

What is claimed is:

1. A cutting pick tool comprising:
a central axis;
a cutting tip of a diamond composite, the tip having an axially forward region including a first conical external surface and a mount portion extending axially rearward toward the central axis, the mount portion including a substantially planar end surface, wherein a first annular curved section forms a junction between the planar end surface and a second conical external surface of the mount portion; and
a cemented carbide support body having an axially forward rim and an axially rearward region mounted at a pick body, the support body including an outer surface that extends axially rearward from the forward rim and a recess also extending axially rearward from the forward rim, the mount portion being received and mated within the recess, the recess being defined by a conical sidewall that tapers radially inward in a direction from the forward rim to the rearward region and towards the central axis, an axially rearwardmost region of the recess being defined by a substantially planar base surface, the planar base surface being bordered at its perimeter by a second annular curved section that forms a junction with the conical sidewall, the mount portion having a truncated conical shape profile that is complementary to a profile of the recess to seat the mount portion within the recess, the first annular curved section of the mount portion corresponding to the second annular curved section of the recess and the second conical external surface and planar end surface of the mount portion being arranged in close touching contact with the conical sidewall and the planar base surface of the recess respectively, such that approximately half or just less than half of a volume of the cutting tip is accommodated within the recess, wherein the first external surface of the cutting tip is substantially coplanar with the outer surface of the support body.

2. The tool as claimed in claim 1 , wherein an axial depth of the recess in an axial direction of the tool is in a range of 20 to 30% of a total axial length of the support body.

3. The tool as claimed in claim 1 , wherein an angle by which the conical sidewall tapers radially inward relative to the central axis is in the range of 10 to 70°.

4. The tool as claimed in claim 3 , wherein the range is 20 to 40°.

5. The tool as claimed in claim 3 , wherein the range is 25 to 35°.

6. The tool as claimed in a claim 1 , wherein the axially forward region of the tip includes a domed apex and is generally conical being defined by the first conical external surface, an angle of the first conical external surface relative to the central axis being at least equal to or greater than an angle by which the conical sidewall of the recess tapers radially inward relative to the central axis.

7. The tool as claimed in claim 1 , wherein a rearward end of the conical sidewall terminates at the planar base surface.

8. The tool as claimed in claim 7 , wherein the second annular junction is disposed between the rearward end of the conical sidewall and the planar base surface and is curved to provide a gradual transition from the conical sidewall to the planar base surface devoid of an edge or sharp angled portion.

9. The tool as claimed in claim 1 , further comprising a bonding braze layer positioned between the cutting tip and the support body.

10. The tool as claimed in claim 1 , further comprising a bonding braze layer positioned between the support body and the pick body.

11. The tool as claimed in claim 1 , wherein 55 to 65% of the cutting tip projects axially forward from the support body.

12. The tool as claimed in claim 1 , wherein the cutting tip includes a waist region disposed between the axially forward region and the mount portion.

13. The tool as claimed in claim 12 , wherein the mount portion of the cutting tip has an axial length that extends between the planar end surface and a rearward end of the waist portion, the axial length of the mount portion being located within the recess.

14. A method of manufacturing a cutting pick tool comprising:
forming a diamond composite into a cutting tip, the cutting tip having an axially forward region including a first conical external surface and a mount portion extending axially rearward, the mount portion including a substantially planar end surface, wherein a first annular curved section forms a junction between the planar end surface and a second conical external surface of the mount portion;
providing a cemented carbide support body having an axially forward rim and an axially rearward region, the axially rearward region being mounted at a pick body, the support body including an outer surface that extends axially rearward from the axially forward rim and a recess also extending rearwardly from the axially forward rim and having a shape and configuration to receive the mount portion, such that approximately half or just less than half of a volume of the cutting tip is accommodated within the recess;
forming the recess with a conical sidewall that tapers radially inward towards a central axis of the tool in a direction from the axially forward rim to the axially rearward region, an axially rearwardmost region of the recess being defined by a substantially planar base surface, the planar base surface being bordered at its perimeter by a second annular curved section that forms a junction with the conical sidewall;
positioning the mount portion of the tip within the recess, the first conical external surface of the tip being substantially coplanar with the outer surface of the support body, the first annular curved section of the mount portion corresponding to the second annular curved section of the recess and the second conical external surface and planar end surface of the mount portion being arranged in close touching contact with the conical sidewall and planar base surface of the recess respectively; and
bonding the tip to the support body by brazing.

15. The method as claimed in claim 14 , further comprising bonding the support body to the pick body by brazing.

16. A cutting machine comprising a plurality of pick tools, each of the picking tools including
a cutting tip of a diamond composite, the tip having an axially forward region including a first conical external surface and a mount portion extending axially rearward, the mount portion including a substantially planar end surface, wherein a first annular curved section is provided at a junction between the planar end surface and a second conical external surface of the mount portion; and
a cemented carbide support body having an axially forward rim and an axially rearward region mounted at a pick body, the support body including an outer surface that extends axially rearward from the axially forward rim and a recess extending axially rearward from the axially forward rim, the mount portion being received and mated within the recess, wherein the recess is defined by a conical sidewall that tapers radially inward in a direction from the axially forward rim to the axially rearward region and towards a central axis, an axially rearwardmost region of the recess being defined by a substantially planar base surface, the planar base surface being bordered at its perimeter by a second annular curved section that forms a junction with the conical sidewall, the mount portion having a truncated conical shape profile that is complementary to a profile of the recess to seat the mount portion within the recess, the first annular curved section of the mount portion corresponding to the second annular curved section of the r

Assignees

• Sandvik Intellectual Property

Inventors

• Voitic Hannes
• Fader Joseph
• Lammer Alfred
• Monyak Kenneth
• Weaver Steven

Classifications

• E21C35/1837

  characterised by the shape · CPC title

• E21C35/1831

  Fixing methods or devices · CPC title

• E21C35/183 Primary

  with inserts or layers of wear-resisting material {(drill bits with wear-resistant parts E21B10/46)} · CPC title

• B23K1/0008

  specially adapted for particular articles or work · CPC title

• B23K1/20

  Preliminary treatment of work or areas to be soldered, e.g. in respect of a galvanic coating · CPC title