CN104963632A - Fixed cutting tooth drill bit capable of preventing teeth from falling - Google Patents
Fixed cutting tooth drill bit capable of preventing teeth from falling Download PDFInfo
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- CN104963632A CN104963632A CN201510419580.2A CN201510419580A CN104963632A CN 104963632 A CN104963632 A CN 104963632A CN 201510419580 A CN201510419580 A CN 201510419580A CN 104963632 A CN104963632 A CN 104963632A
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- cutting teeth
- tooth
- drill bit
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- tooth nest
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Abstract
The invention discloses a fixed cutting tooth drill bit capable of preventing teeth from falling and belongs to the technical field of drill bits for drilling. The drill bit comprises a drill bit body and the cutting teeth, a cylindrical boss is arranged on the bottom faces of the cutting teeth, the cylindrical boss and the cutting teeth are integrated, a round blind hole is further formed in the bottom face of a tooth socket on the drill bit body, the structure of the cutting teeth adapts to the structure of the tooth socket, and furthermore, grooves parallel to the axis of the tooth socket are evenly formed in the cylindrical face of the tooth socket. Compared with the prior art, the drill bit and a drill bit in the prior art have the same appearance structure, the tooth fixing strength of the cutting teeth is enhanced by optimizing and improving the structural relation of the cutting teeth and the tooth socket, silver brazing is protected against excessive erosion, and the cutting teeth can be effectively prevented from falling.
Description
Technical field
The invention belongs to the drilling equipment rock crushing tool fields such as petroleum gas, mine engineering, building foundation engineering construction, geology, the hydrology.
Background technology
Drill bit is in order to fractured rock, the rock crushing tool forming pit shaft in drilling engineering.Existing drill bit is mainly divided into on-fixed cutter drill bits and fixed cutter drill bits.So-called on-fixed cutter drill bits, refers in working order, tooth or there is the drill bit of relative motion between cutting teeth and bit body.If the cutting teeth on drill bit is integrated with bit body consolidation all the time, there is no relative motion each other, then claim this kind of drill bit to be fixed cutter drill bits.
Fixed cutter drill bits mainly contains drag bit, PDC(composite polycrystal-diamond) drill bit, diamond-impregnated bit, its Typical Representative is PDC(composite polycrystal-diamond) drill bit.PDC drill bit is one of main bit kind used in drilling engineering (particularly oil and gas well drilling engineering).During PDC bit operation, drill bit rotary drilling under the effect of the pressure of the drill, relies on the cutting of the PDC composite sheet formation rock on drill bit or scrapes and cut effect fractured rock, thus formed in formation rock and extend pit shaft gradually.
In PDC drill bit of the prior art, PDC composite sheet is cemented on bit body by the mode of silver brazing.Generally, the shape of the composite sheet used is cylinder, and about there is one-third of the area exposure on this cylindrical face of cylinder in bit body surface, and the area of other 2/3rds contacts with bit body.PDC composite sheet is when cutting bottom rock, and bottom rock has larger impact force to composite sheet, if the weld strength of silver brazing is not enough to opposing bottom rock to the impact of composite sheet, composite sheet will be made to come off from bit body, be referred to as de-tooth or flake phenomenon.As long as the some composite sheet on drill bit come off, so adjacent with this composite sheet bottom rock impact force suffered by composite sheet can sharply increase, and the wearing and tearing of aggravation drill bit or the more de-tooth phenomenon of generation, cause the actual effect of drill bit.
The principal element affecting composite sheet weld strength has: 1. the exposure of PDC composite sheet is in the height on bit body surface.The height of composite sheet exposure in bit body surface is lower, and the area that composite sheet contacts with bit body is larger, and so weld strength is higher, but due to the proud exposure of composite sheet low, the degree of depth that composite sheet is pressed into rock is lower, and so drill bit rate of penetration is lower.Therefore 1/3rd external surfaces of composite sheet understand exposures outside bit body under normal circumstances.2. the hydraulic erosion of pair silver solder.In drilling process, drilling fluid has stronger erosion operation to bit body, and therefore the material of bit body or the material on bit body surface are based on the wear-resistant tungsten carbide of Anti-erosion.But be weld the silver solder used between composite sheet with bit body, the erosion resistance of silver solder is more weak, if drill bit is longer in the working time in shaft bottom, so silver solder gradually by erosion, can will badly influence the weld strength of composite sheet.3. silver solder skewness.The diameter 0.4mm larger than the diameter of the tooth nest corresponding with corresponding composite sheet of general composite sheet, during soldering composite sheet, is full of silver solder by the space in 0.4mm gap.Because the fine impurities that exists during welding composite sheet and the gap between composite sheet and tooth nest make the locus of composite sheet not fix, cause silver solder skewness, the soldering strength of composite sheet will be affected.
Summary of the invention
The object of the invention is to: provide a kind of can the fixed cutter drill bits of anticreep tooth in advance, by strengthening the weld strength of silver brazing, silver brazing can be prevented by undue erosion simultaneously, reaching the risk reducing de-tooth, increase the service time of drill bit in shaft bottom.
The object of the invention is realized by following technical proposals:
Can the fixed cutter drill bits of anticreep tooth in advance, comprise bit body and cutting teeth, it is characterized in that: described bit body is provided with the tooth nest matched with described cutting teeth profile; The cutting edge theoretical contour of described cutting teeth is circular, and be provided with the cylinder boss becoming to be integrated with cutting teeth in the bottom surface of described cutting teeth, described cylinder boss is identical with the axis of cutting teeth; Also be provided with blind round hole in the bottom surface of described tooth nest, the axis of described blind round hole is identical with the axis of tooth nest; Described cutting teeth is cemented in tooth nest by the mode of silver brazing, and described cylinder boss is placed in blind round hole.
By the above-mentioned cutting teeth of mode consolidation of silver brazing in corresponding tooth nest, during welding cutting teeth, be first melted in tooth nest and blind round hole by silver brazing material, then tooth nest is inserted in cutting, the part cylindrical of cutting teeth inserts in the blind round hole of tooth nest bottom surface.Because the axis of blind round hole is identical with the axis of tooth nest, blind round hole is formed cutting teeth and supports, and the gap of cutting teeth and tooth nest is fixed, evenly, the wlding after fusing is evenly distributed in tooth nest, consolidation cutting teeth after cooling, is conducive to the weld strength improving cutting teeth.Silver brazing material simultaneously in blind round hole also strengthens the weld strength to cutting teeth, and blind round hole is arranged on tooth nest bottom surface, and waterpower is difficult to carry out erosion to the silver brazing material of its inside.
The length of described blind round hole is longer than the length being cemented in its inner cylinder boss.The bottom surface of cutting teeth can be made near the bottom surface of tooth nest, and tooth nest forms effective support and protection to cutting teeth.
The face of cylinder of described tooth nest is evenly provided with the groove be parallel to each other with tooth nest axis.Silver brazing material after fusing enters described groove, cutting teeth in turning gear nest, and the silver brazing material under molten state can take in described groove by cutting teeth equably, and the periphery of tooth nest can be made to cover silver brazing material uniformly.After cooling, cutting teeth is cemented in tooth nest.Because the groove in tooth nest is filled with silver brazing material equably, add the weld strength of cutting teeth and tooth nest, and hydraulic blow is difficult to effectively carry out erosion to the silver brazing material in groove, avoid the weld strength reducing cutting teeth because of hydraulic erosion, the risk that can effectively prevent cutting teeth to come off.
On the other hand, during welding cutting teeth, some impurity can enter in the silver brazing material after fusing unavoidably, if do not have fluted design, the impurity that particle is larger can have influence on the positional precision of cutting teeth in tooth nest, finally has influence on the result of use of drill bit.Adopt the groove of design of the present invention, impurity can enter in groove, is unlikely to have influence on the positional precision of cutting teeth in tooth nest.
As preferred embodiment, the cross section of the groove on the face of cylinder of described tooth nest is rectangle.
As preferred embodiment, the cross section of the groove on the face of cylinder of described tooth nest is semicircle.
As preferred embodiment, the material of described cutting teeth is PDC composite sheet, impregnated with diamond, carbide alloy or cubic boron nitride.
Beneficial effect of the present invention:
1. pass through at cutting teeth floor design cylinder boss, and blind round hole is set in corresponding tooth nest bottom surface, add the contact area of silver brazing material and cutting teeth and tooth nest, weld strength is increased, also make silver brazing material be difficult to by erosion simultaneously, the effect that prevention cutting teeth comes off can be played.
2. the design feature of the cylinder boss of cutting teeth and the blind round hole of tooth nest, make cutting teeth at tooth nest for can realize precise positioning, and silver brazing material distributes in tooth nest more even.
3. by arranging groove on the tooth nest face of cylinder, can silver brazing material in the groove of available protecting tooth nest, the risk that can effectively prevent cutting teeth to come off.
4. drill bit of the present invention is identical with the surface structure of existing bit technique, but by optimizing, improving the structural relation of cutting teeth and tooth nest, enhances permanent tooth intensity, can effectively prevent cutting teeth to come off.
Accompanying drawing explanation
Below in conjunction with accompanying drawing and embodiments of the present invention, the present invention is further described.
Fig. 1 is the sectional view of drill bit of the present invention.
Fig. 2 is the structural representation of cutting teeth of the present invention.
Fig. 3 is the specific embodiment of the invention one.
Fig. 4 is the structural representation of bit body in prior art.
Fig. 5 is the specific embodiment of the invention two.
Fig. 6 is the fluted structural representation one of tooth nest tool of the present invention.
Fig. 7 is the fluted structural representation two of tooth nest tool of the present invention.
Mark in figure: 1-bit body, 2-cutting teeth, 21-cutting edge, 22-cylinder boss, 3-tooth nest, 301-blind round hole, 302-groove.
Detailed description of the invention
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Fig. 1 signal indicate that the present invention is a kind of can the basic structure of the fixed cutter drill bits of anticreep tooth in advance, comprise bit body 1 and cutting teeth 2, it is characterized in that: described bit body 1 is provided with the tooth nest 3 matched with described cutting teeth 2 profile.Cutting teeth structure as shown in Figure 2, cutting edge 21 theoretical contour of described cutting teeth 2 is circular, and be provided with the cylinder boss 22 becoming to be integrated with cutting teeth in the bottom surface of described cutting teeth 2, described cylinder boss 22 is identical with the axis of cutting teeth 2.Tooth nest structure as shown in Figure 3, is also provided with blind round hole 301 in the bottom surface of described tooth nest 3, and the axis of described blind round hole 301 is identical with the axis of tooth nest 3; Described cutting teeth 2 is cemented in tooth nest 3 by the mode of silver brazing, and described cylinder boss 22 is placed in blind round hole 301.
Compared with the prior art shown in Fig. 4, drill bit of the present invention adds cylinder boss 22 on the basis of existing cutting teeth technology, and the basis of existing bit body technology is provided with in tooth nest 3 bottom surface the blind round hole 301 being longer than cylinder 22.Cutting teeth 2 realizes precise positioning in tooth nest 3, kept in balance in gap between the face of cylinder of the face of cylinder of cutting teeth 2 and tooth nest, silver brazing material is evenly distributed in described gap, in addition between cylinder boss 22 and blind round hole 301, also use silver brazing material consolidation, more positive effect is played to the slip-off preventing of cutting teeth 2.
Fig. 5 is the another kind of detailed description of the invention of drill bit of the present invention.Tooth nest 3 bottom surface of bit body 1 is provided with blind round hole 301, and on the face of cylinder of tooth nest 3, is evenly provided with the groove 302 be parallel to each other with tooth nest axis simultaneously.The design of groove makes silver brazing material add the contact area with tooth nest, makes the consolidation of cutting teeth more firm, also protects silver brazing material simultaneously and avoid by undue erosion, play the effect that prevention cutting teeth comes off.
As shown in Figure 6, as a kind of preferred embodiment, the cross section of the groove 302 on the face of cylinder of described tooth nest 3 is rectangle.
As shown in Fig. 7 institute, as another kind of preferred embodiment, the cross section of the groove 302 on the face of cylinder of described tooth nest 3 is semicircle.
As preferred embodiment, the material of described cutting teeth is PDC composite sheet, impregnated with diamond, carbide alloy or cubic boron nitride.
Those of ordinary skill in the art will be appreciated that, above embodiment is only used to the present invention is described, and be not used as limitation of the invention, as long as in spirit of the present invention, all will drop in Claims scope of the present invention the change of the above embodiment, modification.
Claims (6)
1. can the fixed cutter drill bits of anticreep tooth in advance, comprise bit body (1) and cutting teeth (2), it is characterized in that: described bit body (1) is provided with the tooth nest matched with described cutting teeth (2) profile; Cutting edge (21) theoretical contour of described cutting teeth (2) is circular, and be provided with the cylinder boss (22) becoming to be integrated with cutting teeth (2) in the bottom surface of described cutting teeth (2), described cylinder boss (22) is identical with the axis of cutting teeth (2); Also be provided with blind round hole (301) in the bottom surface of described tooth nest (3), the axis of described blind round hole (301) is identical with the axis of tooth nest (3); Described cutting teeth (2) is cemented in tooth nest (3) by the mode of silver brazing, and described cylinder boss (22) is placed in blind round hole (301).
2. as claimed in claim 1 can the fixed cutter drill bits of anticreep tooth in advance, it is characterized in that: the length of described blind round hole (301) is longer than the length being cemented in its inner cylinder boss (22).
3. as claimed in claim 1 can the fixed cutter drill bits of anticreep tooth in advance, it is characterized in that: on the face of cylinder of described tooth nest (3), be evenly provided with the groove (302) be parallel to each other with tooth nest axis.
4. as claimed in claim 3 can the fixed cutter drill bits of anticreep tooth in advance, it is characterized in that: the cross section of the groove (302) on the face of cylinder of described tooth nest (3) is rectangle.
5. as claimed in claim 3 can the fixed cutter drill bits of anticreep tooth in advance, it is characterized in that: the cross section of the groove (302) on the face of cylinder of described tooth nest (3) is for semicircle.
6. as claimed in claim 1 can the fixed cutter drill bits of anticreep tooth in advance, it is characterized in that: the material of described cutting teeth is PDC composite sheet, impregnated with diamond, carbide alloy or cubic boron nitride.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510419580.2A CN104963632B (en) | 2015-07-17 | 2015-07-17 | A kind of fixed cutter drill bits for being capable of pre- anticreep tooth |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510419580.2A CN104963632B (en) | 2015-07-17 | 2015-07-17 | A kind of fixed cutter drill bits for being capable of pre- anticreep tooth |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104963632A true CN104963632A (en) | 2015-10-07 |
| CN104963632B CN104963632B (en) | 2017-09-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510419580.2A Active CN104963632B (en) | 2015-07-17 | 2015-07-17 | A kind of fixed cutter drill bits for being capable of pre- anticreep tooth |
Country Status (1)
| Country | Link |
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| CN (1) | CN104963632B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109372434A (en) * | 2018-11-19 | 2019-02-22 | 三原石油钻头厂 | A kind of single-cone rotary drill bit of insert floating composite teeth |
| CN109386237A (en) * | 2018-11-19 | 2019-02-26 | 三原石油钻头厂 | A kind of multitool wing drill bit of insert floating composite teeth |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6408958B1 (en) * | 2000-10-23 | 2002-06-25 | Baker Hughes Incorporated | Superabrasive cutting assemblies including cutters of varying orientations and drill bits so equipped |
| US20130140094A1 (en) * | 2011-12-05 | 2013-06-06 | Smith International, Inc. | Rolling cutter using pin, ball or extrusion on the bit body as attachment methods |
| WO2013116679A1 (en) * | 2012-02-03 | 2013-08-08 | Baker Hughes Incorporated | Cutting element retention for high exposure cutting elements on earth-boring tools |
| US20140196959A1 (en) * | 2006-08-11 | 2014-07-17 | Schlumberger Technology Corporation | Downhole drill bit |
| CN104246110A (en) * | 2011-12-29 | 2014-12-24 | 史密斯国际有限公司 | Split sleeves for rolling cutters |
-
2015
- 2015-07-17 CN CN201510419580.2A patent/CN104963632B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6408958B1 (en) * | 2000-10-23 | 2002-06-25 | Baker Hughes Incorporated | Superabrasive cutting assemblies including cutters of varying orientations and drill bits so equipped |
| US20140196959A1 (en) * | 2006-08-11 | 2014-07-17 | Schlumberger Technology Corporation | Downhole drill bit |
| US20130140094A1 (en) * | 2011-12-05 | 2013-06-06 | Smith International, Inc. | Rolling cutter using pin, ball or extrusion on the bit body as attachment methods |
| CN104246110A (en) * | 2011-12-29 | 2014-12-24 | 史密斯国际有限公司 | Split sleeves for rolling cutters |
| WO2013116679A1 (en) * | 2012-02-03 | 2013-08-08 | Baker Hughes Incorporated | Cutting element retention for high exposure cutting elements on earth-boring tools |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109372434A (en) * | 2018-11-19 | 2019-02-22 | 三原石油钻头厂 | A kind of single-cone rotary drill bit of insert floating composite teeth |
| CN109386237A (en) * | 2018-11-19 | 2019-02-26 | 三原石油钻头厂 | A kind of multitool wing drill bit of insert floating composite teeth |
| CN109386237B (en) * | 2018-11-19 | 2024-04-30 | 三原石油钻头厂 | Multi-blade drill bit inlaid with floating composite teeth |
| CN109372434B (en) * | 2018-11-19 | 2024-04-30 | 三原石油钻头厂 | Single cone bit inlaid with floating composite teeth |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104963632B (en) | 2017-09-29 |
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