US4453605A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drill bit and method of metallurgical and mechanical holding of cutters in a drill bit
Assignee: Camco International Inc
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Filing: 1981-04-30
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Granted: 1984-06-12
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Expires: 2001-04-30
Abstract
Abstract Disclosed is a method and apparatus for mechanically and metallurgically holding a cutter in a drill bit pocket. The method includes using powder metallurgy techniques in the formation of a drill bit member having a plurality of pockets configured to inhibit displacement of cutters out of the pockets in a direction transverse to the drill bit working surface. The method further includes the steps of metallurgically bonding and mechanically engaging the cutter with the cutter pocket. The drill bit manufactured in accordance with the methods of the present invention include a carbide menstrum drill bit head having a working surface with a plurality of fluid courses and nozzles thereon in adjacent relationship with a plurality of cutter blade bands comprising a series of cutter pockets having cutters disposed therein in a fashion parallel with the working surface.
Inventors
- 👤 Lot W. Short, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:19
CPC Classifications
B; B23; B23P; B23P15/00; B23P15/28; B23P15/32; B22; B22F; B22F7/00; B22F7/06; E; E21; E21B; E21B10/00; E21B10/46; E21B10/56; E21B10/567; E21B10/60; E21B10/602; B22F2998/00; Y; Y10; Y10S; Y10S76/00; Y10S76/11; Y10S76/12; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49863; Y10T29/49865
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
171 words
A method of manufacturing a drill bit comprising the steps of: forming a drill bit head by a powder metallurgy utilizing a graphite mold having a series of proturbences for forming pockets, the proturbances having external dimensions slightly in excess of the inner dimensions of the finished pockets to allow for shrinkage during the furnacing of the drill bit head; and, attaching cutters having cutting faces into said pockets by: forming a plurality of substantially enclosed dimensionally controlled pockets in said drill bit; placing brazing foil in communication with the backs and bottoms of the cutters having excess foil protruding from above the top of the cutters; tap fitting the cutters and braze material into the cutter pockets; metallurgically attaching said cutters to said cutter pockets by heating said drill bit to a predetermined brazing temperature to expand the cutter pockets thus allowing the brazed foil to funnel into the pockets and substantially encompass said cutters; and shrink fitting said cutter pocket to said cutter by hydrogen cooling said drill bit.
Claim 2
Independent Claim
171 words
A method of manufacturing a drill bit comprising the steps of: forming a drill bit head by a powder metallurgy utilizing a graphite mold having a series of proturbences for forming pockets, the proturbances having external dimensions slightly in excess of the inner dimensions of the finished pockets to allow for shrinkage during the furnacing of the drill bit head; and, attaching cutters having cutting faces into said pockets by: forming a plurality of substantially enclosed dimensionally controlled pockets in said drill bit; placing brazing foil in communication with the backs and bottoms of the cutters having excess foil protruding from above the top of the cutters; tap fitting the cutters and braze material into the cutter pockets; metallurgically attaching said cutters to said cutter pockets by heating said drill bit to a predetermined brazing temperature to expand the cutter pockets thus allowing the brazed foil to funnel into the pockets and substantially encompass said cutters; and shrink fitting said cutter pocket to said cutter by hydrogen cooling said drill bit.
Claim 3
Dependent Claim
33 words
The method of manufacturing a drill bit as set forth in claim 1 further including the step of locating carbide sintered nozzels within the drill bit head in adjacent relationship to said cutters.
Claim 4
Dependent Claim
33 words
The method of manufacturing a drill bit as set forth in claim 1 wherein said cutters comprise drill blanks including a synthetic polycrystalline diamond face and a backing plate secured to said face.
Claim 5
Dependent Claim
32 words
The method of manufacturing a drill bit as set forth in claim 1 wherein said cutters are provided with pretinning and have a diameter in the range of 0.530 to 0.534 inches.
Claim 6
Dependent Claim
25 words
The method of manufacturing a drill bit as set forth in claim 1 wherein the drill bit head is formed from a carbide containing matrix.
Claim 7
Dependent Claim
22 words
The method of manufacturing a drill bit as set forth in claim 1 wherein said brazing material is a nickel-silver alloy foil.
Claim 8
Dependent Claim
26 words
The method of manufacturing a drill bit as set forth in claim 1 wherein said drill bit head comprises a matrix material composed of carbon menstrum.
Claim 9
Dependent Claim
10 words
A drill bit manufactured by the method of claim 1.
Claim 10
Dependent Claim
53 words
The method of manufacturing a drill bit as set forth in claim 1 wherein said pockets are dimensionally controlled to be greater than 10% of the shrinkage per side due to cooling the bit head after furnacing for metallurgical bonding to prevent shrink fitting onto the cutter that will crack the bit head.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-06-12 | 1987-12-12 | 1988-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-12 | 1991-12-12 | 1992-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-12 | 1995-12-12 | 1996-06-12 | $7700.00 | Window Closed / Lapsed |