CN103132912B - A kind of wide insert bit - Google Patents
A kind of wide insert bit Download PDFInfo
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- CN103132912B CN103132912B CN201310063623.9A CN201310063623A CN103132912B CN 103132912 B CN103132912 B CN 103132912B CN 201310063623 A CN201310063623 A CN 201310063623A CN 103132912 B CN103132912 B CN 103132912B
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Abstract
The invention discloses a kind of wide insert bit, belong to the drilling equipment technical fields such as petroleum gas, mine engineering, building foundation engineering construction, geology, the hydrology, comprise bit body, at least one gear wheel, described gear wheel is installed with tooth, described tooth is wide inserted, its 4 points of addendum widths are more than or equal to its tooth post width, and the cross section of its tooth post is non-circular.The invention provides a kind of insert bit of wide tooth top structure, this drill bit, while expansion drill bit ground adaptability, can improve the application life of drill teeth and drill bit, particularly in the creeping into of soft formation, has obvious advantage.
Description
Technical field
The invention belongs to the drilling equipment technical fields such as petroleum gas, mine engineering, building foundation engineering construction, geology, the hydrology, relate to a kind of rock bit concretely.
Background technology
Drill bit is in order to fractured rock, the rock crushing tool forming pit shaft in drilling engineering.Rock bit is rock crushing tool conventional in drilling engineering.Tricone bit is mainly to impact the form fractured rock crushed, and namely tooth is by the impact to rock, extruding with scrape with a small amount of slippage and cut fractured rock.The tricone bit used in current drilling engineering comprises steel-tooth bit (also known as mill tooth bit) and tungsten carbide insert bit (also known as tungsten carbide insert bit).Mill teeth rock bit directly mills out cutting teeth on gear wheel base substrate, and cutting teeth material is identical with cone body material, is generally steel material, and the intensity of tooth is lower, abrasion resistance is poor, is generally used for soft formation.Size due to tooth is large (addendum width and proud exposure are all larger), therefore mill tooth bit efficiency of breaking rock in the creeping into of soft formation is high; But due to the restriction of cutting teeth material, easily there is Strength Failure and wear out failure in Cutter.For improving the abrasion resistance of cutting teeth, generally to carry out intensive treatment on steel-tooth surface, or surfacing antifriction alloy is to improve its surface strength and abrasion resistance, but process after surface strengthen layer or surfacing layer thickness limited, surface strength and abrasion resistance are still not as good as carbide alloy, and the steel-tooth after process still has larger gap compared with carbide alloy tooth.The cutting teeth life-span of mill teeth rock bit is not high, limits its application life and the application in comparatively hard or that abrasiveness is strong stratum thereof.Tungsten carbide insert bit is with the inlaid solid carbide alloy tooth of the mode such as interference fit or welding (hereinafter referred to as hard-metal insert or tooth) in the perforation that cone body is reserved, and hardness and the abrasion resistance of hard-metal insert are obviously better than steel-tooth, are generally used for comparatively hard formation.The tooth size of insert bit is less (particularly addendum width is little), and its addendum width is all significantly less than the diameter of the inlaid solid part in bottom, and the more sharp-pointed tooth head formed can adapt to the broken rock compared with hard formation preferably.But because tooth size is little, insert bit is in the drilling efficiency obviously too late mill teeth rock bit of soft formation.And, in Practical Project, complex formation is changeable, not single soft formation or hard formation, stratum and heterogeneity stratum and common stratum, the soft or hard having a hard interbedded layer is interlocked, in this case, existing steel-tooth bit (also known as mill tooth bit) and tungsten carbide insert bit (also known as tungsten carbide insert bit) result of use are all had a greatly reduced quality.
Summary of the invention
The object of the invention is to: provide a kind of wide tooth top insert bit, this drill bit, while expansion drill bit ground adaptability, can improve the application life of drill teeth and drill bit, particularly in the creeping into of soft formation, has obvious advantage.
The present invention for the adopted technical scheme that achieves the above object is:
A kind of wide insert bit, comprise bit body, at least one gear wheel, described gear wheel is installed with tooth, described tooth is wide inserted, and its 4 points of addendum widths are more than or equal to its tooth post width, and the cross-sectional outling of its tooth post is non-circular.
The structure of tooth is one of key factor affecting roller bit cutting efficiency.Perforation on the tooth of insert bit and gear wheel adopts the interference fit mode such as (or welding-on) to be inlaid solid on gear wheel usually.The bottom of tooth and cutter teeth hole form interference fit (this part is called inlaid solid part or the tooth post of tooth), and the surface that tooth and perforation form interference fit is generally the face of cylinder; The top exposure part of tooth is positioned at outside the surface of cone shell, for directly contacting, (this part is called the working portion of tooth to fractured rock, bizet or head also referred to as tooth), under normal circumstances, radial direction (perpendicular to tooth axis direction, the diametric(al) of the parallel tooth lower cylindrical) size of tooth bizet is less than the body diameter of inlaid solid part.The size (diameter and height) of the inlaid solid part of tooth and the magnitude of interference are the keys determining permanent tooth intensity, and the shape and size of tooth bizet are then the keys determining tooth service behaviour.Usually so-called " flute profile " or " profile of tooth " just refers to the classification to tooth work according to tooth corona shape and the feature of size.Common tooth flute profile (or profile of tooth) comprises hemi-spherical ended shape insert, conical tooth, chisel teeth, scoop chisel insert, eccentric scoop chisel insert, wedge crested chisel insert etc.
The major parameter of representing teeth corona shape and size is the proud exposure h of tooth, the addendum thickness T(of the addendum width W of tooth and tooth is shown in Figure 19).Proud exposure h refers to the height of tooth exposure outside cone shell surface, is called for short proud exposure or tooth depth; The addendum width W of tooth refers to that the tooth top region of tooth is perpendicular to the maximum transverse size in the plane of tooth axis, is called for short addendum width; The thickness T of tooth refers to that tooth tooth top region is in the maximum transverse size perpendicular to tooth width direction, is called for short addendum thickness.Addendum width and addendum thickness represent the lateral dimension at tooth top, and lateral dimension is less, and tooth more sharply, more easily invades rock, but also more easily Strength Failure occur simultaneously, and tooth abrasion resistance is also lower.With regard to the impact on tooth efficiency of breaking rock, the width of tooth has more special meaning, reason is: although rock bit is mainly with granulitization fractured rock, but drill teeth can make tooth produce the effect of scraping and cutting brokenly rock moving with Relative sliding during rock contact, now, the width of tooth is larger, scrapes area inswept when cutting larger, and it is also more obvious to scrape the effect of cutting brokenly rock.
But, due to the particularity of tooth corona shape, the concept of tooth " tooth top region " has certain ambiguity, thus needs in addition concrete agreement, can according to the object of unified method tolerance addendum width and addendum thickness to the tooth of various shape to reach.For this reason, spy does agree as follows: N is a natural number, longitudinally doing a plane P perpendicular to tooth axis (see Figure 19) apart from the position of tooth bizet peak h/N, the N that tooth is tooth by the region between this plane to tooth bizet peak divides tooth top region.Divide in tooth top region at the N of tooth, perpendicular to the maximum transverse size of tooth axis, the N for tooth divides addendum width (also namely: the Breadth Maximum that the N of tooth divides tooth top region to project in plane P); The direction of maximum transverse size corresponding in P plane is tooth top facewidth direction; This tooth top region perpendicular to the maximum transverse size on addendum width direction, for the N of tooth divides addendum thickness.In Figure 19, designate 4 points of tooth top regions (region between P plane to tooth top peak) of chisel teeth, 4 points of addendum width W, addendum width direction and 4 points of addendum thickness T.Under normal circumstances, the shape of tooth bizet is all more and more sharp-pointed to top by root, so the tooth cross-sectional width/thickness in plane P, the N with regard to equaling tooth divides addendum width/thickness.
The top exposure part of the tooth on existing insert bit, is the pointed nose upwards shunk gradually from lower teeth post, and the addendum width of tooth is all significantly less than the diameter of lower teeth post.Tooth in the present invention has longer addendum width, and 4 points of addendum widths of tooth are all more than or equal to the width of tooth lower teeth post, and are called wide inserted by the tooth of this kind long addendum width.Wide insert bit adopts wide inserted, and the cross section of wide inserted tooth post (i.e. the inlaid solid part in bottom) is non-circular.Transverse direction (the vertical tooth short transverse) maximum size of wide inserted tooth post is the length of tooth post, and the maximum transverse size in vertical length direction is the width of tooth post (if Fig. 5, L1 are the length of tooth post, W1 is the width of tooth post).The wide 4 points of inserted addendum widths of the present invention are more than or equal to the width of its tooth post, and wide inserted addendum width and exposure size are all comparatively large, effectively can improve drill bit at the efficiency of breaking rock compared with incompetent bed.The cross section of this kind of tooth post is non-circular wide inserted, the tooth top width of its top exposure part can design very long along the length direction of lower teeth post, tooth top width can be obviously longer than conventional inserted, and the length of lower teeth post can be the lengthening that adapts to tooth top width and lengthens, tooth post cross section is non-circularly to provide convenience and condition for adding the tooth top width teethed.Tooth top exposure part and rock effect stressed time, the tooth of longer addendum width is uneven along the stressed possibility on addendum width direction, the cross section non-circular tooth post of corresponding lengthening effectively can bear the load with balanced tooth exposure part, improve the stress distribution of tooth, thus improve tooth intensity and inlaid solid reliability.
By such scheme, described wide inserted material is carbide alloy, or diamond does the carbide alloy composite teeth strengthened on surface, or impregnated with diamond cutting teeth etc.
The beneficial effect of patent of the present invention is:
(1) bit cone adopts wide inserted, wide inserted tooth post cross-sectional outling is non-circular, and wide inserted addendum width is large; Wide inserted on gear wheel is inserted, widely insertedly select the material different from cone body, as adopted, hardness and abrasion resistance are all much better than the hard-metal insert of gear wheel material, diamond does the carbide alloy composite teeth that surface is strengthened, or impregnated with diamond cutting teeth etc., the abrasion resistance of these teeth and hardness etc. are all apparently higher than the cutting teeth of conventional milling tooth roller drill bit.The present invention had both had larger addendum width and exposure size, and simultaneously also have stronger intensity and abrasion resistance, tooth life and drill bit efficiency of breaking rock all will significantly improve, particularly at comparatively soft formation, drill bit service behaviour can obviously be promoted.
(2) the present invention adopts wide inserted, expands the stratum accommodation of drill bit, drill bit can be applied to creeping into compared with hard formation, has particularly widened drill bit in the application having the stratum of hard interbedded layer, soft or hard is interlocked in stratum and heterogeneity stratum.The present invention adopts the wide inserted compliance enhancing drill bit stratum, improves the drilling efficiency of drill bit, can reduce drilling cost.
(3) the wide inserted of the present invention's employing has larger addendum width and exposure size, effectively can improve the shaft bottom coverage scale of drill bit compared with traditional tungsten carbide insert bit, and then improves drill bit efficiency of breaking rock.
As preferably, described wide 4 points of inserted addendum widths are more than or equal to its tooth column length.
In such scheme, make full use of wide inserted tooth column length, increase wide inserted addendum width along tooth column length, can make full use of and play the above-mentioned beneficial effect of wide tungsten carbide insert bit.When wide inserted addendum width equals its tooth column length, wide inserted lower teeth column dimension and top exposure measure-alike, be conducive to wide inserted machine-shaping.Wide 4 points of inserted addendum width W are greater than the length L1 of tooth post, break through the inertial thinking of the sharp-pointed form of prior art tooth further, form a up big and down small similar mushroom.The wide inserted of this structure is conducive to wide tungsten carbide insert bit in the raising compared with soft formation drilling efficiency, simultaneously can in the object not increasing inlaid solid portion size, the prerequisite of cutter teeth hole dimension is issued to increase addendum width, it also assures that the intensity of cone shell while ensure that the inlaid solid reliability of tooth.
As preferred further, described wide 4 points of inserted addendum widths are not less than 1.2 times of its tooth post width.
As preferred further, described wide 4 points of inserted addendum widths are not less than 1.5 times of its tooth post width.
As preferred further, described wide inserted lower teeth post and top exposure part are through step transition.
Wide inserted through step transition of this lower teeth post and top exposure part in such scheme, its step surface can be sat and be pressed on the face, aperture of gear wheel perforation, axial compression when tooth is worked is born by face, perforation aperture, is no longer born by the cone shell that perforation is low.Like this, the load acting on cone shell during tooth work will be improved greatly, can significantly improve the load diatibution uniformity of cone body and the reliability and safety of housing; Or, the thickness at the bottom of gear wheel perforation hole and between gear wheel inner bearing hole can be reduced, thus increase the size in gear wheel inner bearing hole, namely increase the size of gear wheel inner bearing, improve intensity and the application life of gear wheel bearing, and then extend drilling life of bit.
As preferred further, described wide inserted lower teeth post and the transition of top exposure partial arc.
As preferably, the shape of cross section of described wide inserted tooth post is the round rectangle of two semicircle.
In such scheme, wide inserted tooth post cross section is the round rectangle of two semicircle, is conducive to the processing of corresponding perforation on the machine-shaping of wide inserted tooth post and gear wheel.
As preferably, the shape of cross section of described wide inserted tooth post is oval.
In such scheme, wide inserted tooth post cross section is oval, and be conducive to the processing of corresponding perforation on the machine-shaping of wide inserted tooth post and gear wheel, oval tooth post profile and perforation are also convenient to realize modern digital machine, process workable.
As preferably, the cross-sectional profiles of described wide inserted tooth post intersects by least two circles the outline that forms and is formed.
In such scheme, the cross-sectional profiles of wide inserted tooth post intersects by multiple circle the outline that forms and is formed, and its corresponding perforation shape is also that multiple circle intersects and forms, and its processing (as bored or milling etc.) being convenient to tooth tooth post and perforation is shaping, and processing technology is good; Circular arc position be tooth post and perforation fit tightly position, be easy to ensure the shape of tooth post, perforation, size and tolerance fit precision, be convenient to the control of use level between tooth tooth post and perforation, improve the inlaid solid intensity of tooth and reliability.
As preferred further, the shape of cross section of described wide inserted tooth post is three circle fusiformis, and namely tooth post cross-sectional profiles is formed primarily of three circles intersect, and the radius of middle circle (arc) is greater than the radius on both sides circle (arc), form a fusiformis, the perforation corresponding to tooth post is also three circle fusiformis.This preferred version except there is above-mentioned beneficial effect, the bending resistance of tooth in addendum thickness direction and permanent tooth intensity all stronger.
As preferably, the cross-sectional profiles of described wide inserted tooth post is connected and composed via straightway or curved section (preferred circular arc) by least two circular arcs.
As preferred further, the cross-sectional profiles of described wide inserted tooth post is both sides major arc, and intermediate curve section (preferred circular arc) or straightway are formed by connecting.
As preferably, described wide inserted be carbide alloy tooth, or diamond does the carbide alloy composite teeth strengthened on surface, or impregnated with diamond tooth etc.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of wide insert bit of the present invention.
The top view (view when seeing along drill axis against drill bit drilling direction) that Fig. 2 is the drill bit of structure shown in Fig. 1.
Fig. 3 is the wide inserted shaft bottom radial cloth tooth coverage diagram of the wide insert bit of the present invention.
A kind of wide inserted tooth structure schematic diagram of Fig. 4 to be the shape of cross section of wide inserted tooth post of the present invention be round rectangle of two semicircle.
Fig. 5 for shown in Fig. 4 wide inserted see at the bottom of tooth along tooth axis from tooth top time schematic diagram.
Fig. 6 for wide inserted inlaid solid after gear wheel perforation shown in Fig. 4, along partial sectional view during tooth axis cutting.
Fig. 7 for shown in Fig. 4 wide inserted be fixed in gear wheel perforation after, along the partial sectional view during cross section cutting of tooth lower teeth post.
Fig. 8 is the shape of cross section of wide inserted tooth post of the present invention is oval a kind of wide inserted tooth structure schematic diagram.
Fig. 9 for shown in Fig. 8 wide inserted see at the bottom of tooth along tooth axis from tooth top time schematic diagram.
Figure 10 is a kind of wide inserted tooth structure schematic diagram that wide inserted tooth column length of the present invention equals wide inserted 4 points of addendum widths.
Figure 11 for shown in Figure 10 wide inserted see at the bottom of tooth along tooth axis from tooth top time schematic diagram.
Figure 12 is that wide inserted tooth column length of the present invention is less than wide inserted 4 points of addendum widths, and lower teeth post and top exposure part are through a kind of wide inserted tooth structure schematic diagram of step transition.
Figure 13 for shown in Figure 12 wide inserted see at the bottom of tooth along tooth axis from tooth top time schematic diagram.
Figure 14 for wide inserted inlaid solid after gear wheel perforation shown in Figure 12, along partial sectional view during tooth axis cutting.
Figure 15 is that wide inserted tooth column length of the present invention is less than wide inserted 4 points of addendum widths, a kind of wide inserted tooth structure schematic diagram of lower teeth post and the transition of top exposure partial arc.
Figure 16 for shown in Figure 15 wide inserted see at the bottom of tooth along tooth axis from tooth top time schematic diagram.
Wide inserted tooth post cross-sectional profiles schematic diagram during Figure 17 to be tooth post cross-sectional profiles be three circle fusiformis.
Figure 18 is tooth post cross-sectional profiles is the wide inserted tooth post cross-sectional profiles schematic diagram that in the middle of the major arc of both sides, circular arc or straightway are formed by connecting.
Figure 19 is for the schematic diagram of tooth 4 points of addendum width W and thickness T of chisel teeth.
In figure: 1, bit body, 2, gear wheel, 3, wide inserted, 31, tooth post.
Detailed description of the invention
Following non-limiting examples is for illustration of the present invention.
embodiment 1:
As shown in Fig. 1 to 7, a kind of wide insert bit, comprises bit body 1, at least one gear wheel 2(as three gear wheels etc.), gear wheel 2 is installed with wide inserted by 3, wide inserted 3 are preferably carbide alloy tooth, or diamond does the carbide alloy composite teeth strengthened on surface, or impregnated with diamond tooth etc.The cross-sectional outling of the tooth post 31 of wide inserted 3 is non-circular, and as preferably, the shape of cross section of the tooth post 31 of wide inserted 3 is the round rectangle of two semicircle, and 4 points of addendum widths of wide inserted 3 are more than or equal to its tooth post width.Preferably, 4 points of addendum widths of wide inserted 3 are not less than 1.2 times of its tooth post width, and more preferably 4 points of addendum widths of wide inserted 3 are not less than 1.5 times of its tooth post width.
embodiment 2:
As shown in Figure 8,9, a kind of wide insert bit, comprises bit body 1, at least one gear wheel 2(as three gear wheels etc.), gear wheel 2 is installed with wide inserted by 3, wide inserted 3 are preferably carbide alloy tooth, or diamond does the carbide alloy composite teeth strengthened on surface, or impregnated with diamond tooth etc.The cross-sectional outling of the tooth post 31 of wide inserted 3 is non-circular, and as preferably, the cross-sectional profiles shape of the tooth post 31 of wide inserted 3 is oval, and 4 points of addendum widths of wide inserted 3 are more than or equal to its tooth post width.Preferably, 4 points of addendum widths of wide inserted 3 are not less than 1.2 times of its tooth post width, and more preferably 4 points of addendum widths of wide inserted 3 are not less than 1.5 times of its tooth post width.
embodiment 3:
The present embodiment is substantially identical with embodiment 1 or 2, and its difference is: 4 points of addendum widths of wide inserted 3 are more than or equal to its tooth column length.As shown in Figure 10,11, illustrate wide inserted 3 tooth column lengths and equal wide inserted 4 points of addendum widths.
embodiment 4:
As shown in Figure 12,13,14, the present embodiment is substantially the same manner as Example 3, and its difference is: the lower teeth post 31 of wide inserted 3 and top exposure part are through step transition.
embodiment 5:
As shown in Figure 15,16, the present embodiment is substantially the same manner as Example 3, and its difference is: the lower teeth post 31 of wide inserted 3 and the transition of top exposure partial arc.
embodiment 6:
As shown in Figure 17,18, the present embodiment and embodiment 1-5 are substantially identical, and its difference is: the cross-sectional outling of the lower teeth post 31 of wide inserted 3 intersects by least two circles the outline that forms and formed.As Figure 17, the shape of cross section of the tooth post 31 of wide inserted 3 is three circle fusiformis, and namely the cross-sectional profiles of tooth post 31 is formed primarily of three circles intersect, and the radius of middle circle (arc) is greater than the radius on both sides circle (arc), forms a fusiformis.
embodiment 7:
The present embodiment and embodiment 1-5 are substantially identical, and its difference is: the cross-sectional profiles of wide inserted 3 tooth posts 31 is connected and composed via straightway or curved section (preferred circular arc) by least two circular arcs.Preferably, the cross-sectional profiles of wide inserted 3 tooth posts 31 is both sides major arc, and intermediate curve section (preferred circular arc) or straightway are formed by connecting.As Figure 18, the cross-sectional outling of the tooth post 31 of wide inserted 3 is formed by connecting by circular arc in the middle of the major arc of both sides or straightway.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a wide insert bit, comprise bit body, at least one gear wheel, described gear wheel is installed with tooth, it is characterized in that: described tooth is wide inserted, its 4 points of addendum widths are not less than 1.5 times of its tooth post width, and the cross-sectional outling of its tooth post is non-circular.
2. wide insert bit as claimed in claim 1, is characterized in that: described wide 4 points of inserted addendum widths are more than or equal to its tooth column length.
3. wide insert bit as claimed in claim 2, is characterized in that: described wide inserted lower teeth post and top exposure part are through step transition.
4. wide insert bit as claimed in claim 1, is characterized in that: the shape of cross section of described wide inserted tooth post is the round rectangle of two semicircle.
5. wide insert bit as claimed in claim 1, is characterized in that: the shape of cross section of described wide inserted tooth post is for oval.
6. wide insert bit as claimed in claim 1, is characterized in that: the cross-sectional profiles of described wide inserted tooth post intersects by least two circles the outline that forms and formed.
7. wide insert bit as claimed in claim 6, is characterized in that: the shape of cross section of described wide inserted tooth post is three circle fusiformis.
8. wide insert bit as claimed in claim 1, is characterized in that: the cross-sectional profiles of described wide inserted tooth post is connected and composed via straightway or curved section by least two circular arcs.
9. wide insert bit as claimed in claim 8, is characterized in that: the cross-sectional profiles of described wide inserted tooth post is both sides major arc, and intermediate curve section or straightway are formed by connecting.
10. the wide insert bit as described in claim arbitrary in claim 1 to 9, is characterized in that: described wide inserted for carbide alloy tooth, or diamond does the carbide alloy composite teeth strengthened on surface, or impregnated with diamond tooth.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310063623.9A CN103132912B (en) | 2013-02-28 | 2013-02-28 | A kind of wide insert bit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310063623.9A CN103132912B (en) | 2013-02-28 | 2013-02-28 | A kind of wide insert bit |
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| CN103132912A CN103132912A (en) | 2013-06-05 |
| CN103132912B true CN103132912B (en) | 2015-11-18 |
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| CN201310063623.9A Active CN103132912B (en) | 2013-02-28 | 2013-02-28 | A kind of wide insert bit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106050147A (en) * | 2016-07-20 | 2016-10-26 | 西南石油大学 | Wide-top reinforced tooth |
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|---|---|---|---|---|
| US6227318B1 (en) * | 1998-12-07 | 2001-05-08 | Smith International, Inc. | Superhard material enhanced inserts for earth-boring bits |
| CN2462066Y (en) * | 2000-10-16 | 2001-11-28 | 西南石油学院 | Single gear wheel-fixed cutter composite drill bit |
| CN2486727Y (en) * | 2001-06-01 | 2002-04-17 | 西南石油学院 | Tungsten carbide insert roller bit using orifice end face positioning mode mosaic tooth |
| CN2923974Y (en) * | 2006-07-17 | 2007-07-18 | 苏州江钻新锐工程工具有限公司 | Tricone bit |
| CN201738816U (en) * | 2010-08-25 | 2011-02-09 | 株洲硬质合金集团有限公司 | Diamond compact substrate |
| CN203248081U (en) * | 2013-02-28 | 2013-10-23 | 西南石油大学 | Wide insert cone bit |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6367568B2 (en) * | 1997-09-04 | 2002-04-09 | Smith International, Inc. | Steel tooth cutter element with expanded crest |
| US20090172172A1 (en) * | 2007-12-21 | 2009-07-02 | Erik Lambert Graham | Systems and methods for enabling peer-to-peer communication among visitors to a common website |
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2013
- 2013-02-28 CN CN201310063623.9A patent/CN103132912B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6227318B1 (en) * | 1998-12-07 | 2001-05-08 | Smith International, Inc. | Superhard material enhanced inserts for earth-boring bits |
| CN2462066Y (en) * | 2000-10-16 | 2001-11-28 | 西南石油学院 | Single gear wheel-fixed cutter composite drill bit |
| CN2486727Y (en) * | 2001-06-01 | 2002-04-17 | 西南石油学院 | Tungsten carbide insert roller bit using orifice end face positioning mode mosaic tooth |
| CN2923974Y (en) * | 2006-07-17 | 2007-07-18 | 苏州江钻新锐工程工具有限公司 | Tricone bit |
| CN201738816U (en) * | 2010-08-25 | 2011-02-09 | 株洲硬质合金集团有限公司 | Diamond compact substrate |
| CN203248081U (en) * | 2013-02-28 | 2013-10-23 | 西南石油大学 | Wide insert cone bit |
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