Core drill bit

Patent metadata

Field	Value
Publication number	US-10723041-B2
Application number	US-201715796372-A
Country	US
Kind code	B2
Filing date	Oct 27, 2017
Priority date	Oct 28, 2016
Publication date	Jul 28, 2020
Grant date	Jul 28, 2020

Abstract

A core drill bit can include a first region and a second region. The first region can include abrasive particles in a first bond matrix, and the second region can include abrasive particles in a second bond matrix. The first region is connected to the second region. A composition of the first bond matrix can be different from a composition of the second matrix. In a particular embodiment, the first bond matric can include a Co-containing material.

First claim

What is claimed is:

1. A core drill bit comprising:
an abrasive tip and a drill body, wherein the abrasive tip comprises a first region and a second region; and
a central opening extending through the first region, the second region, and the body,
wherein the first region comprises abrasive grains within a first bond matrix and a first bond matrix concentration of at least 90% and not greater than 99% for a total weight of the first region, wherein the second region comprises abrasive grains within a second bond matrix, and wherein a composition of the first bond matrix is different from a composition of the second bond matrix.

2. The core drill bit of claim 1 , further comprising a longitudinal axis running a length of the core drill bit, wherein the abrasive tip is attached to the drill body in a direction of the longitudinal axis, and wherein the first region is bonded to the second region in the direction of the longitudinal axis.

3. The core drill bit of claim 1 , wherein the first region has a first hardness RH 1 and the second region has a second hardness RH 2 and wherein RH 1 is different than RH 2 .

4. The core drill bit of claim 3 , wherein RH 1 is greater than RH 2 .

5. The core drill bit of claim 1 , wherein the first bond matrix comprises a Fe-containing material, an alloy including Co, or a combination thereof.

6. The core drill bit of claim 1 , wherein the first bond matrix comprises Co, Fe, and Cu.

7. The core drill bit of claim 1 , wherein the second bond matrix comprises Co, Sn, or combination thereof.

8. The core drill bit of claim 1 , wherein the first region comprises a beveled edge at an end distal from the second region.

9. The core drill bit of claim 1 , further comprising an elemental weight percent difference between a composition of the first bond matrix and a composition of the second bond matrix of not greater than 90%.

10. A core drill bit comprising:
a longitudinal axis running a length of the drill bit;
a central opening;
a drill body;
a first region comprising abrasive grains within a first bond matrix; and
a second region comprising abrasive grains within a second bond matrix,
wherein the second region is disposed between the drill body and the first region in a direction of the longitudinal axis running the length of the drill bit;
wherein the first region comprises an annular cross-section about the longitudinal axis of the drill bit, wherein the second region comprises an annular cross-section about the longitudinal axis of the drill bit, and wherein a composition of the first bond matrix is different from a composition of the second bond matrix; and
wherein the central opening extends through the first region and the second region in a direction of the longitudinal axis.

11. The core drill bit of claim 10 , wherein the first region is bonded to the second region, and wherein a maximum outer diameter of the second region is greater than an outer diameter of the first region.

12. The core drill bit of claim 11 , wherein the second region comprises a chamfer.

13. The core drill bit of claim 10 , wherein the first bond matrix comprises Co and Fe.

14. The core drill bit of claim 10 , wherein the second bond matrix comprises Co and Sn.

15. The core drill bit of claim 10 , wherein the abrasive grains of the first region comprise a superabrasive material.

16. The core drill bit of claim 10 , wherein the first region comprises a concentration of Fe from about 10% to about 90% for a total weigh of the first bond material.

17. The core drill bit of claim 10 , wherein the first region comprises a concentration of Co from about 5% to about 40% for a total weigh of the first bond material.

18. The core drill bit of claim 10 , wherein the first region comprises a concentration of Cu from about 2% to about 60% for a total weigh of the first bond material.

19. The core drill bit of claim 10 , wherein the first region comprises a first bond matrix concentration of at least 90% and not greater than 99% for a total weight of the first region.

Assignees

• Saint Gobain Abrasives Inc
• Saint Gobain Abrasifs Sa
• Saint Gobain Abrasives Inc /Saint Gobain Abrasifs

Inventors

• Wang Ji

Classifications

• B23B51/04

  {Drills} for trepanning · CPC title

• E21B10/02

  Core bits (characterised by wear resisting parts E21B10/48) · CPC title

• B23B2226/45

  Glass · CPC title

• B23B2222/44

  Iron · CPC title

• C03B33/105 Primary

  Details of cutting or scoring means, e.g. tips · CPC title