DRILL BITS AND METHODS OF PRODUCING DRILL BITS

• US 3,757,879 A
• Filed: 08/24/1972
• Issued: 09/11/1973
• Est. Priority Date: 08/24/1972
• Status: Expired due to Term

• Current Assignee: Eastman Christensen Company (Baker Hughes Company)
• Original Assignee: Arthur G. Wilder, Harold C. Bridwell
• Inventors: Wilder, Arthur G., Bridwell, Harold C.
• Primary Examiner(s): Brown, David H.
• Application Number:
  US05/283,474
• Time in Patent Office: 383 Days
• Field of Search: 175/329,330,409-411
• US Class Current: 175/434
• CPC Class Codes: E21B 10/46 characterised by wear resisting parts, e.g. diamond inserts

Abstract

A diamond bit comprising a steel shank coated with abrasive particles, with a ring of tungsten-coated iron particles bonded together in a metal matrix and by metal to the end of the shank.

Claims

2. The drill bit of claim 1 in which the metal encapsulating said iron particles is tungsten, or tantalum, or columbium (niobium) or molybdenum or titanium.

3. In the drill bit of claim 2, said abrasive particles in said coating are tungsten carbide, or metal-encapsulated alumina, or metal-encapsulated silicon carbide, or metal-encapsulated boron nitride.

4. In the drill bit of claim 3 in which the ring is metal-bonded tungsten-coated iron or iron-based alloy.

5. The drill bit of claim 1 in which said coat extends over the crown end of said shank and in which diamond particles are surface set in said end, in space configuration over the said end surface forming the crown of said bit.

6. The drill bit of claim 5 in which the metal encapsulating particles in said ring is tungsten, or tantalum, or columbium (noibium) or molybdenum or titanium.

7. The drill of claim 5 in which the ring contains metal-bonded tungsten-encapsulated iron, or iron-based alloy.

8. The drill of claim 1 in which the coat extends over the crown end of said shank and at said crown end contains a metal-bonded mixture of diamond particles and particles of tungsten carbide, or metal-encapsulated alumina, or metal-encapsulated silicon carbide, or metal-encapsulated boron nitride.

9. The drill of claim 8 in which the metal-encapsulating said ring contains iron, or iron-based alloy encapsulated with tungsten, or tantalum, or columbium, or molybdenum, or titanium.

10. In the drill bit of claim 8 in which the ring contains iron or iron-based alloy encapsulated with tungsten.

11. The drill of claim 1 in which said coat extends over the crown end and contains a mixture of diamond particles and tungsten carbide particles and said coat above said crown is substantially free of diamond particles and contains tungsten carbide, or metal-encapsulated alumina, or metal-encapsulaTed silicon carbide, or metal-encapsulated boron nitride.

12. The bit of claim 11 in which said encapsulating metal in the particles of metal in said ring is tungsten, or tantalum, or columbium (niobium), or molybdenum, or titanium.

13. The drill of claim 11 in which the ring contains iron or iron-based alloy encapsulated with tungsten.