EP0197741A3 - Improvements in or relating to rotary drill bits and methods of manufacture thereof - Google Patents
Improvements in or relating to rotary drill bits and methods of manufacture thereof Download PDFInfo
- Publication number
- EP0197741A3 EP0197741A3 EP86302375A EP86302375A EP0197741A3 EP 0197741 A3 EP0197741 A3 EP 0197741A3 EP 86302375 A EP86302375 A EP 86302375A EP 86302375 A EP86302375 A EP 86302375A EP 0197741 A3 EP0197741 A3 EP 0197741A3
- Authority
- EP
- European Patent Office
- Prior art keywords
- cast iron
- mould
- bit body
- rotary drill
- iron
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 238000004519 manufacturing process Methods 0.000 title abstract 2
- 238000000034 method Methods 0.000 title abstract 2
- 229910001018 Cast iron Inorganic materials 0.000 abstract 6
- 238000005266 casting Methods 0.000 abstract 3
- 229910001567 cementite Inorganic materials 0.000 abstract 2
- 238000001816 cooling Methods 0.000 abstract 2
- 238000007711 solidification Methods 0.000 abstract 2
- 230000008023 solidification Effects 0.000 abstract 2
- 229910052714 tellurium Inorganic materials 0.000 abstract 2
- PORWMNRCUJJQNO-UHFFFAOYSA-N tellurium atom Chemical compound [Te] PORWMNRCUJJQNO-UHFFFAOYSA-N 0.000 abstract 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 abstract 1
- 239000000654 additive Substances 0.000 abstract 1
- 230000000996 additive effect Effects 0.000 abstract 1
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- 229910052796 boron Inorganic materials 0.000 abstract 1
- 239000011248 coating agent Substances 0.000 abstract 1
- 238000000576 coating method Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 abstract 1
- 229910000734 martensite Inorganic materials 0.000 abstract 1
- 239000000463 material Substances 0.000 abstract 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/46—Drill bits characterised by wear resisting parts, e.g. diamond inserts
- E21B10/56—Button-type inserts
- E21B10/567—Button-type inserts with preformed cutting elements mounted on a distinct support, e.g. polycrystalline inserts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D15/00—Casting using a mould or core of which a part significant to the process is of high thermal conductivity, e.g. chill casting; Moulds or accessories specially adapted therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/20—Measures not previously mentioned for influencing the grain structure or texture; Selection of compositions therefor
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/46—Drill bits characterised by wear resisting parts, e.g. diamond inserts
Landscapes
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mechanical Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Earth Drilling (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
A method of manufacturing a rotary drill bit at least
partly from cast iron comprises forming a hollow mould in
the configuration of at least a portion of the bit body, and
casting said portion of the bit body in the mould by a casting
process which includes the steps of pouring molten cast iron
into the mould and then cooling in the mould so that the cast
iron solidifies to form said portion of the bit body. The
method includes the further step of subjecting the cast iron
to treatment, during the casting process, which results in at
least one surface portion of the cast iron bit body becoming
hardened. The hardening treatment may comprise adding an
iron carbide forming additive, such as boron or tellurium, to
the cast iron before it is poured, or by chill hardening during
solidification, or by coating the interior of the mould, before
pouring, with a wash of iron carbide forming material, such
as tellurium or by controlling the rate of cooling after
solidification so as to effect the formation of martensite.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8508622 | 1985-04-02 | ||
| GB858508622A GB8508622D0 (en) | 1985-04-02 | 1985-04-02 | Rotary drill bits |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0197741A2 EP0197741A2 (en) | 1986-10-15 |
| EP0197741A3 true EP0197741A3 (en) | 1988-03-16 |
Family
ID=10577095
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP86302375A Withdrawn EP0197741A3 (en) | 1985-04-02 | 1986-04-01 | Improvements in or relating to rotary drill bits and methods of manufacture thereof |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0197741A3 (en) |
| CA (1) | CA1256423A (en) |
| GB (1) | GB8508622D0 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2793174B1 (en) * | 1999-05-07 | 2001-06-29 | Renault | METHOD AND DEVICE FOR MOLDING A CYLINDER HEAD OF AN INTERNAL COMBUSTION ENGINE |
| US6588487B2 (en) | 2000-07-17 | 2003-07-08 | Consolidated Engineering Company, Inc. | Methods and apparatus for utilization of chills for casting |
| CN103273042B (en) * | 2013-05-24 | 2015-04-15 | 成都工业学院 | Method of preparing vanadium-titanium cemented-carbide drilling bit |
| CN108588768B (en) * | 2018-05-29 | 2019-03-01 | 广州市华番盛化工科技有限公司 | Steel and iron parts alkalinity deep hole nickel-plating additive, pre-plating solution and pre-plating process |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4029140A (en) * | 1975-04-01 | 1977-06-14 | The British Cast Iron Research Association | Method of and means for obtaining white cast iron |
| WO1984000385A1 (en) * | 1982-07-19 | 1984-02-02 | Giw Ind Inc | Abrasive resistant white cast iron |
| US4499795A (en) * | 1983-09-23 | 1985-02-19 | Strata Bit Corporation | Method of drill bit manufacture |
-
1985
- 1985-04-02 GB GB858508622A patent/GB8508622D0/en active Pending
-
1986
- 1986-04-01 EP EP86302375A patent/EP0197741A3/en not_active Withdrawn
- 1986-04-01 CA CA000505588A patent/CA1256423A/en not_active Expired
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4029140A (en) * | 1975-04-01 | 1977-06-14 | The British Cast Iron Research Association | Method of and means for obtaining white cast iron |
| WO1984000385A1 (en) * | 1982-07-19 | 1984-02-02 | Giw Ind Inc | Abrasive resistant white cast iron |
| US4499795A (en) * | 1983-09-23 | 1985-02-19 | Strata Bit Corporation | Method of drill bit manufacture |
Non-Patent Citations (2)
| Title |
|---|
| MACHINE DESIGN, vol. 55, no. 8, April 1983, pages 10-12,22, Cleveland, Ohio, US; "The five types of cast iron" * |
| PATENT ABSTRACTS OF JAPAN, vol. 4, no. 116, (M-27)(598), 19th August 1980; & JP-A-55-075874 (YANMAR DIESEL ENGINE K.K.) 07-06-1980 * |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0197741A2 (en) | 1986-10-15 |
| GB8508622D0 (en) | 1985-05-09 |
| CA1256423A (en) | 1989-06-27 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| AK | Designated contracting states |
Kind code of ref document: A2 Designated state(s): BE CH DE FR GB LI NL SE |
|
| PUAL | Search report despatched |
Free format text: ORIGINAL CODE: 0009013 |
|
| AK | Designated contracting states |
Kind code of ref document: A3 Designated state(s): BE CH DE FR GB LI NL SE |
|
| 17P | Request for examination filed |
Effective date: 19880909 |
|
| RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: REED TOOL COMPANY LIMITED |
|
| 17Q | First examination report despatched |
Effective date: 19890608 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
| 18D | Application deemed to be withdrawn |
Effective date: 19891219 |
|
| RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: GRIFFIN, NIGEL DENNIS |