CN103089153B - Wide-tooth cone composite drill bit - Google Patents
Wide-tooth cone composite drill bit Download PDFInfo
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- CN103089153B CN103089153B CN201310063630.9A CN201310063630A CN103089153B CN 103089153 B CN103089153 B CN 103089153B CN 201310063630 A CN201310063630 A CN 201310063630A CN 103089153 B CN103089153 B CN 103089153B
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Abstract
The invention discloses a wide-tooth cone composite drill bit, and belongs to the technical field of drilling equipment in petroleum and gas, mine engineering, building foundation engineering construction, geology, hydrology and the like. The wide-tooth cone composite bit comprises a drill bit body, a fixed cutting structure and at least one cone. The cone and the fixed cutting structure are arranged on the drill bit body. The fixed cutting structure is provided with fixed cutting teeth. The cone is connected with the drill bit body through a bearing structure in a rotating mode. Cross-embedded teeth are embedded and fixed in the cone. A value range of a deflection angle alpha of the tooth top of each cross-embedded tooth is 70 degrees <=|alpha|<= 90 degrees, and an outline of the cross section of the embedded and fixed part of each cross-embedded tooth is non-circular. A novel cone structure is adopted by the wide-tooth cone composite drill bit so that the cone is stable in working, and the drill bit is good in working stability. Compared with an existing composite drill bit, the wide-tooth cone composite drill bit is higher in rock breaking efficiency, and meanwhile service life of the drill bit teeth and the bearing is prolonged, and therefore the service life of the drill bit is prolonged.
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 composite drill bit concretely.
Background technology
Drill bit is in order to fractured rock, the rock crushing tool forming pit shaft in drilling engineering.Rock bit and PDC drill bit are drill bits conventional in drilling engineering.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).Steel-tooth bit directly mills out cutting teeth on gear wheel base substrate, and the intensity of tooth is lower, abrasion resistance is poor, is generally used for soft formation; Tungsten carbide insert bit is inlaid solid carbide alloy tooth (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.Tricone bit mainly breaks rock to impact the form crushed, and namely tooth is by the impact to rock, extruding with scrape with a small amount of slippage and cut fractured rock, and its shortcoming is that capacity usage ratio is not high, efficiency of breaking rock is lower, and in bit operation process, the impact that bearing is subject to is large, and dynamic load factor is large.In form of structure, in order to meet the needs of the broken rock working method of insert bit punching press fragmentation, existing drill bit have employed following three technological means: one, the inlaid solid part in bottom of the cutting teeth (tooth) on existing insert bit is column type, top exposure part shrinks transition by lower cylindrical gradually to tooth axis, mostly be wedge shape or taper, the addendum width of tooth is all significantly less than the diameter of the inlaid solid part in bottom, to form more sharp-pointed impact head.The dynamic load be subject to due to tooth is large, and tooth size is relatively little, so easily there is entirety or the local fracture of tooth.Its two, the tooth top zero deflection (namely tooth top deflection angle is 0 °) of existing most of tri-cone insert bits gear wheel upper teeth, also have tooth (cutting teeth) tooth top of the part gear ring of a small amount of drill bit to have deflection, deflection angle is generally within 50 °.The deflection of tooth be in order to cater to tooth impact press-in rock after slippage scrape butt to, scrape cut effect (amount) to increase the slippage of tooth to rock.They are three years old, there is skew in the gear wheel of most tricone bit, its object is to, skew makes gear wheel pure rolling cannot occur during rolling broken-rock on bottom rock, when making the tooth on gear wheel break rock, slippage increases, tooth slippage on the larger gear wheel of deviant is scraped and is cut more obvious, but the wearing and tearing simultaneously also produced because of slippage are also larger.
PDC drill bit cuts form fractured rock to scrape, and PDC drill bit effectively can break rock and creep into that to form the prerequisite of drilling depth be that PDC tooth can wedging formation rock effectively.After PDC tooth wedging rock under the rotarily driving of bit body, catalase is made to rock formation shear action.When the very hard PDC of rock is difficult to wedging rock, or PDC tooth have wearing and tearing after when being difficult to wedging rock, PDC drill bit efficiency of breaking rock will obviously reduce.
Baker Hughes Inc. proposes a kind of gear wheel-PDC hybrid bit and (all proposes patent application in the U.S. and other countries, as PTC WO2010/132232 etc.), this drill bit adds gear wheel cutting structure on traditional PDC cutting structure basis, is combined by stationary cutting structure and gear wheel cutting structure.Wherein, the stationary cutting structure of gear wheel-PDC hybrid bit is fixed wing by some PDC and is formed, and fixing wing is furnished with fixing cutting teeth (i.e. PDC tooth), and when bit creeps into, the PDC tooth on fixing wing breaks rock to scrape butt formula; Gear wheel cutting structure and the rock bit of gear wheel-PDC hybrid bit are similar, and the tooth on gear wheel mainly breaks rock to impact the mode crushed.Because gear wheel breaks rock to impact the mode crushed, the up-down vibration produced in the gear wheel course of work directly can affect the job stability of PDC stationary cutting structure, thus cause following adverse consequences: first, the shock loading that extensional vibration brings easily causes the damage of PDC tooth, shortens the application life of drill bit; Secondly, extensional vibration can make the depth of tooth penetration generation frequent variations of the PDC tooth in stationary cutting structure, PDC tooth even may be caused frequently to depart from shaft bottom, thus reduce the efficiency of breaking rock of drill bit to a certain extent time serious.In addition, the gear wheel on this composite drill bit still breaks rock to impact the mode crushed, and the operating mode of gear wheel bearing and the similar of tricone bit, cause bearing life short, and the bulk life time of the working life of bearing to drill bit defines obvious restriction.
Summary of the invention
The object of the invention is to: a kind of wide tooth roller composite drill bit is provided, it proposes a kind of new cone structure form, this composite drill bit, gear wheel stable working, bit operation good stability, while relatively existing composite drill bit has higher efficiency of breaking rock, also there is longer drill teeth and the life-span of bearing, thus there is longer drilling life of bit.
The object of the invention is realized by following technical proposals:
A kind of wide tooth roller composite drill bit, comprise bit body, stationary cutting structure and at least one gear wheel, described gear wheel and described stationary cutting structure are arranged on described bit body, described stationary cutting structure is provided with fixing cutting teeth, described gear wheel is formed by bearing arrangement and described bit body and is rotationally connected, it is characterized in that: inlaid solid on described gear wheel have horizontal tooth of having a denture made, and the span of the tooth top angle of deflection of horizontal tooth of having a denture made be 70 °≤| α |≤90 °, the cross-sectional outling of the inlaid solid part of horizontal tooth of having a denture made 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 the inlaid solid part of tooth), and the surface that tooth and perforation form interference fit is generally the face of cylinder; The top 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.According to the difference of tooth bizet geometrical body principal character, tooth can be divided into rotary type tooth and the large class of non-revolved body class tooth two.The bizet surface of rotary type tooth is the surface of revolution coaxial with tooth center line, as hemi-spherical ended shape insert and conical tooth.If the bizet surface of tooth is nonvolatile organic acid, though or be its centre of gyration of surface of revolution and tooth center disalignment, such tooth is non-revolved body class tooth, as chisel teeth, scoop chisel insert, eccentric scoop chisel insert and 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 Fig. 4).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.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, and it is larger that area inswept when cutting is scraped in slippage, and it is also more obvious to scrape the effect of cutting brokenly rock.The tooth of insert bit is general many according to the direction that tooth top width direction is parallel with gear wheel bus inlaid solid (tooth 5 as in Fig. 5).Also the slippage of first analyses and prediction tooth can scrape the direction of cutting motion, then cut the inlaid solid tooth in the perpendicular or subvertical direction of the direction of motion (tooth 6 as in Fig. 5) according to tooth top width with scraping.
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 (see figure 4) perpendicular to tooth axis 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 the diagram, 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 are designated.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.From definition, the difference of addendum width and addendum thickness is only just meaningful to non-revolved body class tooth.
Tooth top deflection angle refers to that addendum line (is parallel to the addendum width direction of tooth, by the center of tooth top peak or highest zone, and the straightway perpendicular with tooth axis) with the angle (angle α as shown in Figure 5, Figure 6) of the wheel cone nut line (take turns bus crossing with tooth axis on the conical surface) of tooth place gear wheel, refer generally to addendum line and take turns acute angle or right angle formed by cone nut line.Specify in this manual: from tooth top along tooth axis direction to cone body, for just to deflect when the wheel cone nut line of the relative gear wheel of addendum line deflects counterclockwise, otherwise then for negative bias turns.The tooth top zero deflection (namely tooth top deflection angle is 0 °) of the cutting teeth on existing most of cone bit cone, or have the tooth tooth top of the part gear ring of a small amount of drill bit to have deflection, deflection angle is generally within 50 °.
For ease of setting forth, defining in this manual: when the tooth top deflection angle of tooth is greater than 50 °, can be described as horizontal tooth of having a denture made.The span of the tooth top angle of deflection of horizontal tooth of having a denture made of the present invention is 70 °≤| α |≤90 °, horizontal tooth of having a denture made is non-revolved body class tooth.
The skew of gear wheel refers to: the offset distance of the pole axis face of gear wheel (cross gear wheel axis and be parallel to the plane of drill axis) center line of bit relatively.As shown in Figure 7, during for seeing along drill bit drilling direction (along drill axis from drill bit thread end to gear wheel end), bit cone is perpendicular to the perspective view in the plane of drill axis, and the distance S in figure between the axis projections of gear wheel and bit central is drill bit deviant.
The gear wheel of wide tooth roller composite drill bit adopts horizontal tooth of having a denture made, and the span of the tooth top angle of deflection of horizontal tooth of having a denture made is between 70 ° ~ 90 ° or-90 ° ~-70 °, make on same gear ring adjacent with horizontal tooth of having a denture made inserted between interval, space greatly reduce, reduce the discontinuity of gear ring, and less with the interdental space of horizontal edge adjacent on gear ring.The cross-sectional outling of the inlaid solid part of horizontal tooth of having a denture made is non-circular.Transverse direction (the vertical tooth short transverse) maximum size of the inlaid solid part of horizontal tooth of having a denture made is the length of inlaid solid part, and the maximum transverse size in vertical length direction is the width of inlaid solid part (if Figure 16, L1 are the length of inlaid solid part, W1 is the width of inlaid solid part).The cross-sectional outling of this kind of inlaid solid part is non-circular tooth, the tooth top width of its top exposure part the length direction of inlaid solid part can design very long along bottom, tooth top width obviously can be longer than conventional dental, and the length of the inlaid solid part in bottom can be the lengthening of adaptation tooth top width and lengthens.Namely inlaid solid partial cross sectional is that the non-circular long tooth top width for tooth is provided convenience and condition.For each horizontal tooth of having a denture made, and the associating of multiple horizontal tooth of having a denture made continuously, its mode of operation in shaft bottom is the rolling of approximate pure rolling, splitting, horizontal tooth of having a denture made is utilized to carry out fractured rock to the large contact stress of rock and extruding, namely crush in the mode close to static pressure, splitting breaks rock, broken rock mode and conventional roller cone drill bit have obvious difference.
Compared with prior art, its beneficial effect is:
(1) composite drill bit of the present invention, which propose a kind of new cone structure form, the wide tooth roller of this form of structure breaks through prior art to all inertial thinkings of insert bit, adopt horizontal tooth of having a denture made, to utilize on gear wheel horizontal, and tooth of having a denture made carrys out brokenly rock to the rolling of rock, splitting, and crushing broken rock mode from the impact of conventional rock bit has the different of essence.When horizontal tooth of having a denture made addendum line perpendicular to or close to perpendicular to gear wheel bus time, the time in teeth contact shaft bottom is obviously elongated, gear wheel due to tooth alternately and the longitudinal direction produced (i.e. drill bit shaft to) is vibrated and obviously died down, for each horizontal tooth of having a denture made, horizontal tooth of having a denture made is utilized to carry out fractured rock to the large contact stress of rock and extruding, thus realize with the object that the mode close to static pressure crushes, rock is broken in splitting, to hard rock, particularly the efficiency of breaking rock of brittle rock is high firmly.Further, the cross-sectional outling of the inlaid solid part in bottom of horizontal tooth of having a denture made is non-circular, the inlaid solid part in bottom can lengthen along addendum width direction thus, to adapt to the increase of addendum width, improve addendum width and increase the stressed of the inlaid solid part of rear lower, the inlaid solid reliability between tooth and gear wheel perforation can be improved, be convenient to the increase of addendum width.Adopt horizontal tooth of having a denture made, less with the space on gear ring between adjacent teeth, and then the horizontal tooth formation of having a denture made of longer tooth top connects rotund fluted disc one by one, more be conducive to the realization aforementionedly crushed in the mode close to static pressure, rock object is broken in splitting, the cross-sectional outling of the inlaid solid part in aforementioned bottom is for non-circular, and the realization for this object provides the basis of more advantage further.And, because gear wheel of the present invention acts on rock with the rolling of approximate pure rolling, splitting mode, gear wheel stable working, the extensional vibration that gear wheel produces because tooth replaces obviously dies down, drill vibration is little, be conducive to the life-span of improving bearing, the static strength reducing tooth lost efficacy and fatigue strength inefficacy, extended the life-span of cone portion; Gear wheel stable working simultaneously, drill vibration is little, make the fixing cutting teeth operating mode being better than existing gear wheel-PDC composite drill bit with the working condition of the fixing cutting teeth of its compound thus, both stable the scraping being conducive to fixing PDC tooth is cut, improve efficiency of breaking rock, the impact failure of fixing PDC tooth can be reduced again, extend the life-span of stationary cutting structure.All will be extended the application life of gear wheel tooth of the present invention, bearing and fixing cutting teeth thus, make drill bit bulk life time obviously be better than existing gear wheel-PDC composite drill bit, and good stability when drill bit creeps into, drilling efficiency is higher.As mentioned above, the program is breaking prior art inertial thinking, while proposing above-mentioned innovative thinking, compare existing composite drill bit, both cone portion had been made to achieve better working effect, solve again the adverse effect to stationary cutting structure that existing composite drill bit causes because of compound simultaneously, achieve the effect of unforeseeable 1+1>>2.
(2) gear wheel of the present invention crushes in the mode of approximate static pressure, splitting breaks rock, bottom rock rolls, circular ring type zone of fracture that splitting goes out a circle circle, gear wheel gear ring acts on rock with great contact stress, not only can form breaking tank, also can roll out damaged crackle and running crack on the bottom of breaking tank and the non-fragmented rock of periphery.Established breaking tank and crackle, make the fixing cutting teeth on stationary cutting structure be easier to wedging bottom rock and scrape cut brokenly rock, improve the rock breaking capacity of stationary cutting structure further.Gear wheel of the present invention rolls, rock mode is broken in splitting and scraping of stationary cutting structure is cut brokenly rock mode and combined and can significantly improve the efficiency of breaking rock of drill bit.
(3) the tooth addendum line of the horizontal tooth of having a denture made on gear wheel of the present invention perpendicular to or close to perpendicular to gear wheel bus, thus can roll in realization, while splitting fractured rock, significantly reduce the slippage of tooth relative to bottom rock.Mutual effect mode and the rock breaking mechanism of tooth of the present invention and rock there occurs obvious change compared with conventional rock bit, its brand-new cloth tooth mode, profile of tooth and broken rock mode, reduce the tooth on gear wheel to scrape the impact of rock and slippage and cut, obviously can improve stressing conditions and the wearing and tearing of tooth, improve the life-span of tooth, the hard formation be particularly suitable for abrasiveness is strong creeps into.
(4) gear wheel stable working of the present invention, reduce dynamic load when drill teeth and rock interact, the load that load ratio conventional roller cone drill bit tooth suffered during tooth fractured rock is subject to when breaking rock is steady, is conducive to strengthening the inlaid solid reliability of tooth, reduces inserted dropping and rupture.
As preferably, 4 points of addendum widths of described horizontal tooth of having a denture made are not less than the width of the inlaid solid part of tooth.
In such scheme, 4 points of addendum widths of horizontal tooth of having a denture made are not less than the width of the inlaid solid part of tooth, the interval, space of adjacent inserted on same gear ring is reduced greatly, reduce the discontinuity of gear ring, realize gear ring tooth well with the mode fractured rock of rolling compaction, splitting, composite drill bit good operating stability, above-mentioned beneficial effect is better.
As preferably, the cylinder of the inlaid solid part of described horizontal tooth of having a denture made is provided with the dentation straight burr bar (being called for short bar tooth) being parallel to tooth axis, and horizontal tooth of having a denture made embeds the mode of cutter teeth hole wall by dentation vertical bar on inlaid solid part cylindrical surface, or to form the interference fit of Multi-point contact type inlaid solid in the perforation of gear wheel dentation vertical bar and cutter teeth hole.
As Figure 20, the cylinder of the inlaid solid part in bottom of horizontal tooth of having a denture made is provided with multiple bar tooth being parallel to tooth axis, is distributed in the bar tooth indentation on inlaid solid part cylindrical surface, similar to the gear teeth of spur gear.When being provided with bar tooth on the cylinder of the inlaid solid part of tooth, the cross-sectional outling of inlaid solid part refers to the profile of the envelope formed by the summit of each bar tooth.The shape of the cross-sectional outling of the inlaid solid part of tooth is similar to cutter teeth hole shape, but radial dimension is greater than the radial dimension of gear wheel perforation.When the deviation of both radial dimensions is larger (particularly when bar tooth crest is more sharp-pointed), in the process of tooth press-in gear wheel perforation, bar tooth can embed or invade the hole wall of perforation, thus realizes the inlaid solid of tooth; When the deviation of both radial dimensions is less (particularly when bar tooth crest is more blunt), in the process of tooth press-in gear wheel perforation, the top of each bar tooth and the hole wall of perforation form the interference fit of Multi-point contact type, so also can realize the inlaid solid of tooth.The inlaid solid part in tooth bottom on existing insert bit gear wheel is cylindrical, tooth is inlaid solid on gear wheel by face contact interference fit, value of interference fit between tooth and gear wheel perforation requires very high, and the magnitude of interference determines the intensity that tooth is inlaid solid and reliability.The magnitude of interference too senior general causes cutter teeth bore deformation excessive, easily causes gear wheel perforation to ftracture, and affects permanent tooth intensity, permanent tooth reliability and cone shell intensity; The magnitude of interference is too little, permanent tooth insufficient strength, and tooth is loosely inlaid solid, and reliability is low.Therefore, this inlaid solid mode requires all higher to crudies such as the dimensional accuracy of perforation and tooth cylinder, tolerance and surface roughnesses, and for ease of processing and ensure inlaid solid quality, general interference fit all adopts cylindrical, and tooth all needs to carry out fine grinding.For ease of increasing addendum width, the cross-sectional outling of the inlaid solid part in bottom of horizontal tooth of having a denture made of the present invention is non-circular, for ensureing to inlay reliability and inlay quality, the cylinder of the inlaid solid part of tooth is provided with bar tooth, adopts the mode of embedding or Multi-contact interference fit inlaid solid in the perforation of gear wheel.Adopt permanent tooth in this way, the tolerance of the radial dimension difference (magnitude of interference) of tooth and perforation, the accuracy of form and position and surface quality is obviously increased, greatly can reduce the crudy requirements such as processing dimension (precision, tolerance) requirement, the surface roughness of tooth and perforation, being easy to realize tooth non-circular cylindrical manufactures shaping, also can ensure inlaying reliability and inlaying quality of tooth simultaneously.
As further preferably, the span of the tooth top angle of deflection of the horizontal tooth of having a denture made on described gear wheel is 80 °≤| α |≤90 °.
The span of the tooth top angle of deflection of horizontal tooth of having a denture made is 80 °≤| α |≤90 °, the interval, space on gear ring between adjacent teeth can be made less, and reduce the discontinuity of gear ring, the tooth top profile of gear ring is closer to circle, composite drill bit good operating stability, above-mentioned beneficial effect is better.
As preferably, 4 points of addendum widths of described horizontal tooth of having a denture made are more than or equal to the length of inlaid solid part.
In such scheme, when addendum width W equals the length L1 of inlaid solid part, be convenient to the fine finishining of exterior of teeth, during the manufacturing, be easy to the control to the magnitude of interference between tooth and gear wheel perforation; Be convenient to control the processing dimension of tooth and the inlaid solid quality of tooth.In such scheme, addendum width W is greater than the length L1 of inlaid solid part, breaks through the inertial thinking of the sharp-pointed form of prior art tooth further, forms a up big and down small similar mushroom.Larger addendum width obviously can reduce the interval, space of gear ring adjacent teeth and the discontinuity of gear ring, the tooth top profile of gear ring is closer to circle, the tooth of being more convenient on gear wheel acts on rock with rolling compaction, splitting mode, is easy to reach the effect so that static pressure mode crushes, rock is broken in splitting.The horizontal tooth of having a denture made of this structure can not increase inlaid solid portion size, cutter teeth hole dimension, and the prerequisite of the spacing do not reduced between gear wheel perforation is issued to the object increasing addendum width, it also assures that the intensity of cone shell while ensure that the inlaid solid reliability of tooth.The horizontal tooth of having a denture made of this structure has numerous form of structure, wherein has several preferably structure: the one of the horizontal tooth of having a denture made of this structure of the present invention, and the inlaid solid part in bottom of horizontal tooth of having a denture made is with top exposure part through step transition, and step surface edge contour is circular; The one of the horizontal tooth of having a denture made of this structure of the present invention, the inlaid solid part in bottom of horizontal tooth of having a denture made is with top exposure part through step transition, and step surface edge contour is key shape.The inlaid solid part in this bottom and horizontal the have a denture made tooth of exposure part in top through step transition, its step surface can be sat and be pressed on the face, aperture of gear wheel perforation, and 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 preferably, the tooth top of described horizontal tooth of having a denture made is the arc raised up along the axis direction of tooth.
In such scheme, when the tooth top of horizontal tooth of having a denture made adopts arc, the gear ring (profile) that the tooth top of the horizontal tooth of having a denture made on same gear ring forms is closer to circle, be conducive to the smooth working of gear wheel, reduce the shock loading of tooth, the load fluctuation during work of reduction gear wheel, is conducive to gear ring and gear wheel crushes in static pressure mode, rock is broken in splitting, be conducive to the life-span of improving bearing and tooth, and improve composite drill bit job stability.
As preferably, the tooth top of described horizontal tooth of the having a denture made outline line along tooth top width direction along tooth axis direction be projected as circular arc.
In such scheme, due to the tooth axis on gear wheel gear ring often with gear wheel axis out of plumb, axis and the gear wheel axis angle of the gear ring tooth particularly near gear wheel tip are less, and when gear ring girth is less, when on gear ring, the number of teeth is less, gear ring circularity is poor.Be circular arc by the profile in the tooth top width direction of horizontal tooth of having a denture made along the Projection Design of the axis direction of tooth, the circularity of gear ring can be improved, make gear ring (profile) closer to circle, be conducive to the smooth working of gear wheel, reduce the shock loading of tooth, reduce load fluctuation during gear wheel work, be conducive to that gear wheel gear ring crushes in static pressure mode, rock is broken in splitting, be conducive to the life-span of improving bearing and tooth, and improve composite drill bit job stability.
As preferably, all or part of interlaced arrangement of horizontal tooth of having a denture made of different gear ring on described gear wheel.
In such scheme, gear wheel is rotating cone body, gear wheel is when shaft bottom rolling broken-rock, tooth on each gear ring changes to another from a scroll wheel, the horizontal tooth interlaced arrangement of having a denture made of different gear ring, tooth on different gear ring can make up the gear ring out-of-roundness that gear ring causes because of same gear ring edge interdental spaces space mutually, make gear wheel work more steady, reduce the shock loading of tooth, reduce load fluctuation during gear wheel work, be conducive to that gear wheel gear ring crushes in static pressure mode, rock is broken in splitting, be conducive to the life-span of improving bearing and tooth.And, on gear wheel horizontal tooth of having a denture made addendum line perpendicular to or close to perpendicular to gear wheel bus, the time in teeth contact shaft bottom is obviously elongated, the extensional vibration that gear wheel produces because tooth replaces obviously dies down, particularly when horizontal on two gear rings have a denture made tooth gear wheel circumferentially layout interlaced with each other time, the extensional vibration of gear wheel is more weak, gear wheel stable working, extensional vibration is little, be conducive to the life-span of improving bearing, the static strength reducing tooth lost efficacy and fatigue strength inefficacy, and improved composite drill bit job stability.
As preferably, the tooth top two ends (two ends along tooth top width) of described horizontal tooth of having a denture made are provided with rounding or chamfering.
In such scheme, the tooth top two ends of horizontal tooth of having a denture made are not if established rounding or chamfered transition, and tooth top two ends will be wedge angle, and when rock is broken in tooth and rock effect, sharp corner easily forms stress and concentrates, and easily makes the fatigue damage of tooth top end or local fracture.Rounding or chamfering are established in tooth top two ends, and stress concentration falls in the stress distribution effectively improving tooth top end, extend tooth application life.
As preferably, the fixing cutting teeth radial direction on the gear ring on described gear wheel and described stationary cutting structure is arranged with rail.
Refer to that the radial position of cutting teeth on drill bit is identical with rail, namely distance drill axis is apart from equal.When gear wheel gear ring and fixing cutting teeth radial direction are arranged with rail, the tooth on gear ring and fixing cutting teeth act on broken rock in turn in the same annular region in shaft bottom.Bottom rock is rolled by the tooth on gear wheel, after splitting, fix cutting teeth rolling, on breaking tank that splitting goes out and carry out scraping again cutting, cutting teeth is conducive to the wedging of fixing cutting teeth with rail cloth tooth, is convenient to the efficiency of breaking rock improving drill bit.
As preferably, 4 points of addendum thicknesses of the horizontal tooth of having a denture made on described gear wheel are not more than 1/4th of the inlaid solid partial width of tooth.
4 points of addendum thicknesses of horizontal tooth of having a denture made are not more than 1/4th of the inlaid solid partial width of tooth, namely the addendum thickness of horizontal tooth of having a denture made is less, under this threshold, extruding slabbing action to rock when being more conducive to tooth rolling compaction, improve the efficiency of breaking rock of bit cone, particularly to high rigidity bad ground, rock breaking efficiency is better, thus improves the efficiency of breaking rock of composite drill bit.
As preferably, the deviant of each gear wheel on described bit body is not more than 1.5% of bit diameter.
The deviant of the gear wheel under this threshold, makes gear ring and gear wheel with pure rolling or the form rolling work closer to pure rolling, is more conducive to gear ring and gear wheel with the mode fractured rock of rolling compaction, splitting; Meanwhile, the slippage that can also reduce gear wheel upper teeth is scraped and is cut, and reduces the wearing and tearing of tooth, extends tooth application life.
The tooth addendum line of the horizontal tooth of having a denture made on gear wheel perpendicular to or close to perpendicular to gear wheel bus, the deviant of gear wheel is very little simultaneously, roll in realization, while splitting fractured rock, significantly can also reduce the slippage of tooth relative to bottom rock.Mutual effect mode and the rock breaking mechanism of the tooth on gear wheel of the present invention and rock there occurs obvious change compared with conventional rock bit, its brand-new cloth tooth mode, profile of tooth and broken rock mode, reduce the tooth on gear wheel to scrape the impact of rock and slippage and cut, obviously can improve stressing conditions and the wearing and tearing of tooth, improve life-span of tooth, be particularly suitable for creeping in hard formation and the strong hard formation of abrasiveness.
As preferably, the span of the tooth top angle of deflection of described horizontal tooth of having a denture made is 85 °≤| α |≤90 °, and on bit body, the deviant of gear wheel is not more than 0.5% of bit diameter.
In theory, on bit cone the tooth top deflection angle of horizontal tooth of having a denture made more close to 90 °, the deviant of gear wheel is less, the continuity of gear ring is better, the tooth top profile of gear ring is more close to circle.On the combination threshold of each parameter of the program, be conducive to the smooth working of gear wheel most, reduce the shock loading of tooth, reduce load fluctuation during gear wheel work, improve the job stability of composite drill bit; Be conducive to most that gear wheel gear ring crushes in static pressure mode, rock is broken in splitting, efficiency of breaking rock is the highest, and significantly improves the life-span of bearing and tooth, and composite drill bit efficiency of breaking rock is high simultaneously.
More preferably, tooth top angle of deflection=90 ° of described horizontal tooth of having a denture made, and on drill bit, gear wheel does not offset (deviant is 0).
Constant at other geometric parameters of drill bit, when tooth size is also constant, tooth top angle of deflection=90 ° can make between cog space minimum, and the continuity of gear ring is best, and the tooth top profile of gear ring is closest to circle; Gear wheel does not offset, and gear wheel pure rolling effect can be made best.Tooth top angle of deflection=90 °, gear wheel do not offset, and are to realize gear ring and gear wheel rolls with pure rolling (or close to pure rolling), the extremely excellent parameter of splitting fractured rock, and drill bit efficiency of breaking rock is high.
As preferably, described horizontal tooth of having a denture made is inner sunken face along the side of two on addendum thickness direction, and 4 of tooth points of addendum widths are not less than the inlaid solid partial width of tooth, 4 points of addendum thicknesses are not more than 1/4th of the inlaid solid partial width of tooth.
Gear wheel tooth is inner sunken face along two sides on the thick direction of tooth top, less at longitudinal (along tooth axis direction) upper teeth addendum thickness, slow from the increase of tooth top down transverse tooth thickness, it is conducive to tooth and rolls, is pressed into rock, and the extruding slabbing action to rock after being conducive to tooth press-in; And it is conducive to tooth and slows down the increase of tooth addendum thickness when wearing and tearing, make gear wheel tooth continue to keep less tooth top thick, extend gear wheel tooth to the press-in of rock, extruding, splitting crushing effect.
As preferably, the profile of the cross section of the inlaid solid part in bottom of described horizontal tooth of having a denture made is formed by connecting by both sides circular arc middle straight line segment, is key shape.
As preferably, the profile of the cross section of the inlaid solid part in the wide inserted bottom of described abnormal shape is be formed by connecting by arc section in the middle of the circular arc of two ends.
In above-mentioned two schemes, the profile of the cross section of the inlaid solid part in bottom of horizontal tooth of having a denture made is formed by connecting by both sides circular arc middle straight line segment, is key shape; Or the profile of the cross section of the inlaid solid part in special-shaped wide inserted bottom is when being formed by connecting by arc section in the middle of the circular arc of two ends.The cylinder of these two kinds of profiles is low compared with the cylinder difficulty of processing of other non-circular profiles, adds and is easy to operation man-hour and realizes, good manufacturability.Perforation corresponding to them is also easy to Milling Process, and processing technology is good.
Accompanying drawing explanation
Fig. 1 is the structural representation of the wide tooth roller composite drill bit of the present invention.In figure, composite drill bit is arranged two fixed-wing stationary cutting structures and two gear wheels, two fixed-wings layout alternate with two gear wheels.
Fig. 2 is view when structure shown in Fig. 1 of the present invention overlooks (inverse drill bit drilling direction is seen) along drill axis, i.e. top view.
Fig. 3 is the schematic diagram that the fixing cutting teeth on the tooth gear ring of the gear wheel of the present invention's wide tooth roller composite drill bit and stationary cutting structure covers along drill bit radial direction.
Fig. 4 is that tooth 4 points of addendum width W and thickness T(are for chisel teeth) schematic diagram.
Fig. 5 is the schematic diagram of the inlaid solid or tooth top of the inserted tooth top zero deflection in existing rock bit when having comparatively small deflection angle (| α | < 50 °) inlaid solid.
Fig. 6 to be the span of the addendum line of the horizontal tooth of having a denture made of the present invention and wheel cone nut wire clamp angle (tooth top deflection angle) α of gear wheel be 70 °≤| α | schematic diagram when < 90 ° or α=90 °.
Schematic diagram when Fig. 7 is the gear wheel skew on drill bit.
Schematic diagram when certain gear wheel that Fig. 8 is structure drill bit shown in Fig. 1 of the present invention is seen along gear wheel axis from gear wheel tip at the bottom of gear wheel.
Fig. 9 is drill bit top view when wide tooth roller composite drill bit being arranged three fixed-wing stationary cutting structures and three gear wheels.All alternate layout between fixed-wing and gear wheel.
Figure 10 is that the horizontal tooth of having a denture made of the present invention is inlaid solid after the non-circular perforation of gear wheel, partial sectional view during vertical tooth axis cutting.
Figure 11 is the profile (and cross-sectional profiles of gear wheel perforation) of the cross section of the inlaid solid part of the horizontal tooth of having a denture made of the present invention is schematic diagram when circular arc centre in two ends is formed by connecting by arc section.
Figure 12 is the inlaid solid partial-length L1 that horizontal tooth 4 points of addendum width W that have a denture made of the present invention equal tooth, but the horizontal toothing schematic diagram of having a denture made when being greater than inlaid solid partial width W1.
Figure 13 is schematic diagram when tooth of having a denture made horizontal shown in Figure 12 is seen along tooth axis from tooth top at the bottom of tooth.
Figure 14 for tooth of having a denture made horizontal shown in Figure 12 inlaid solid after gear wheel perforation, along partial sectional view during tooth axis cutting.
Figure 15 is the one of the horizontal tooth of having a denture made of mushroom of the present invention, the inlaid solid part in bottom of horizontal tooth of having a denture made with top exposure part through step transition, the horizontal tooth schematic diagram of having a denture made when step surface profile is key shape.
Figure 16 is schematic diagram when tooth of having a denture made horizontal shown in Figure 15 is seen along tooth axis from tooth top at the bottom of tooth.
Figure 17 is the one of the horizontal tooth of having a denture made of mushroom of the present invention, the inlaid solid part in bottom of horizontal tooth of having a denture made with top exposure part through step transition, the horizontal tooth schematic diagram of having a denture made when step surface profile is circle.
Figure 18 is schematic diagram when tooth of having a denture made horizontal shown in Figure 17 is seen along tooth axis from tooth top at the bottom of tooth.
Figure 19 for the horizontal tooth of having a denture made of mushroom shown in Figure 15 or Figure 17 inlaid solid after the non-circular perforation of gear wheel, along partial sectional view during tooth axis cutting.
Figure 20 gear wheel of the present invention adopts the horizontal tooth of the having a denture made cylinder of inlaid solid part being provided with the dentation vertical bar (being called for short bar tooth) being parallel to tooth axis, horizontal tooth of having a denture made is not pressed into before in the perforation on gear wheel, and perforation profile size is in the schematic diagram between the tooth top profile of horizontal tooth of having a denture made inlaid solid part bar tooth and concave bottom profile.
Figure 21 is the horizontal tooth of having a denture made gear wheel of the present invention adopting the bar tooth cylinder of inlaid solid part being provided with the axis being parallel to tooth, and horizontal tooth of having a denture made is inlaid solid after the non-circular perforation of gear wheel, partial sectional view during vertical tooth axis cutting.
Figure 22 be the inlaid solid part of the horizontal tooth of having a denture made of the present invention cylinder on be provided with the bar tooth being parallel to tooth axis, the horizontal toothing schematic diagram of having a denture made when horizontal tooth addendum width of having a denture made equals the inlaid solid partial-length of tooth but is greater than inlaid solid partial width.
Figure 23 for tooth of having a denture made horizontal shown in Figure 22 inlaid solid after gear wheel perforation, along partial sectional view during tooth axis cutting.
Figure 24 is the one of the horizontal tooth of having a denture made of mushroom of the present invention, the cylinder of the inlaid solid part of horizontal tooth of having a denture made is provided with the bar tooth being parallel to tooth axis, the inlaid solid part in bottom of horizontal tooth of having a denture made with top exposure part through step transition, step surface profile is key shape, and addendum width is greater than the horizontal tooth schematic diagram of having a denture made during the inlaid solid partial-length in bottom.
Figure 25 is the one of the horizontal tooth of having a denture made of mushroom of the present invention, the cylinder of the inlaid solid part of horizontal tooth of having a denture made is provided with the bar tooth being parallel to tooth axis, the inlaid solid part in bottom of horizontal tooth of having a denture made with top exposure part through step transition, step surface profile is circular, and addendum width is greater than the horizontal tooth schematic diagram of having a denture made during the inlaid solid partial-length in bottom.
Figure 26 for tooth of having a denture made horizontal shown in Figure 24 or Figure 25 inlaid solid after gear wheel perforation, along partial sectional view during tooth axis cutting.
Figure 27 is horizontal tooth of having a denture made the embeds cutter teeth hole wall inlaid solid schematic diagram in gear wheel perforation of mode with bar tooth.
Figure 28 is horizontal tooth of having a denture made the forms Multi-point contact type inlaid solid schematic diagram in gear wheel perforation of interference fit with bar tooth and cutter teeth hole.
Figure 29 is horizontal tooth of having a denture made of the present invention is inner sunken face along the side of two on addendum thickness direction, tooth schematic diagram when seeing along tooth addendum width direction.
The gear wheel of Figure 30 for the present invention's wide tooth roller composite drill bit adopts mushroom shown in Figure 15 or Figure 24 horizontal have a denture made tooth time drill bit top view.
Figure 31 be the tooth top of the horizontal tooth of having a denture made of the present invention outline line along addendum line direction along the axis direction of tooth be projected as circular arc time structural representation.
Figure 32 has a denture made for structure shown in Figure 31 is horizontal the schematic diagram of tooth when seeing at the bottom of tooth along tooth axis from tooth top.
Detailed description of the invention
Following non-limiting examples is for illustration of the present invention.
As shown in Fig. 1 to Figure 32, basic example is: comprise bit body 1, stationary cutting structure 4 and at least one gear wheel 2, gear wheel 2 and stationary cutting structure 4 are arranged on bit body 1, stationary cutting structure 4 is provided with fixing cutting teeth 41, gear wheel is formed by bearing arrangement and bit body 1 and is rotationally connected, inlaid solid on gear wheel 2 have horizontal tooth 3 of having a denture made, and the span of the tooth top angle of deflection of horizontal tooth 3 of having a denture made be 70 °≤| α |≤90 °, the cross-sectional outling of the inlaid solid part 31 of horizontal tooth 3 of having a denture made is non-circular.As preferably, horizontal tooth 3 of having a denture made can be hard-metal insert, the hard-metal insert, impregnated with diamond tooth etc. strengthened with diamond.
Each horizontal tooth of having a denture made of the present invention program all can realize its effect, for the ease of example, the composite drill bit of modal pair of gear wheel+bis-fixed-wing or the composite drill bit of three gear wheel+three fixed-wings is all adopted in each figure, each gear ring of each gear wheel is horizontal tooth of having a denture made, it does not represent and the conflicting of basic example and other preferences, being only illustrative example, there is not disturbance of understanding in those skilled in the art.
As preferably one of basic example, 4 points of addendum width W of horizontal tooth 3 of having a denture made are not less than the width W 1 of the inlaid solid part 31 of tooth.
As preferably one more preferably, at least one gear wheel 2 on bit body 1 has at least on 1 gear ring, the ratio that horizontal tooth 3 number of having a denture made accounts for place gear ring tooth number is at least 50%.Further preferably, at least one gear wheel 2 of bit body 1 has at least 1 gear ring all adopt horizontal tooth 3 of having a denture made, and the span of the tooth top angle of deflection of horizontal tooth 3 of having a denture made be 70 °≤| α |≤90 °; As further preferably, each gear wheel on bit body 1 has at least 1 gear ring to adopt horizontal tooth 3 of having a denture made, and the span of the tooth top angle of deflection of horizontal tooth 3 of having a denture made be 70 °≤| α |≤90 °.As more preferably, each gear wheel on bit body 1 has at least 1 gear ring to adopt 4 points of addendum width W to be not less than the horizontal tooth 3 of having a denture made of the width W 1 in the inlaid solid portion of tooth 31, and the span of the tooth top angle of deflection of horizontal tooth 3 of having a denture made be 70 °≤| α |≤90 °.As further preferably, each gear wheel on bit body 1 has at least 1 gear ring to adopt 4 points of addendum width W to be not less than the horizontal tooth 3 of having a denture made of tooth inlaid solid part 31 width W 1, and the span of the tooth top angle of deflection of horizontal tooth 3 of having a denture made be 80 °≤| α |≤90 °.More preferably, each gear wheel on bit body 1 has at least 1 gear ring to adopt 4 points of addendum width W to be not less than the horizontal tooth 3 of having a denture made of the width W 1 of the inlaid solid part of tooth 31, and the span of the tooth top angle of deflection of horizontal tooth 3 of having a denture made be 80 °≤| α |≤90 °.As shown in Fig. 6, Fig. 9 to Figure 18.
As preferably two, 4 points of addendum width W of horizontal tooth 3 of having a denture made are more than or equal to the length L1 of inlaid solid part 31.More preferably, the span of the tooth top angle of deflection of horizontal tooth 3 of having a denture made be 80 °≤| α |≤90 °.4 points of addendum width W of horizontal tooth 3 of having a denture made equal the length of inlaid solid part, shown in Figure 12 to 14.4 points of addendum width W of horizontal tooth 3 of having a denture made are greater than the length L1 of inlaid solid part 31, form a up big and down small similar mushroom, as shown in Figure 15 to 19.Figure 15,16 is depicted as the one of the horizontal tooth 3 of having a denture made of mushroom of the present invention, and the inlaid solid part 31 in bottom of horizontal tooth 3 of having a denture made is with top exposure part through step transition, and step surface edge contour is key shape.Figure 17,18 is depicted as the one of the horizontal tooth 3 of having a denture made of mushroom of the present invention, and the inlaid solid part 31 in bottom of horizontal tooth 3 of having a denture made is with top exposure part through step transition, and step surface edge contour is circular.
As preferably three, the tooth top of horizontal tooth 3 of having a denture made is the arc raised up along the axis direction of tooth, and as shown in Figure 14,19, the tooth top of horizontal tooth 3 of having a denture made is arc-shaped.
As preferably four, the tooth top of horizontal tooth 3 of the having a denture made outline line along tooth top width direction along tooth axis direction be projected as circular arc, as shown in Figure 30,31, it can improve the circularity of gear ring.
As preferably five, the horizontal all or part of interlaced arrangement of tooth 3 of having a denture made of the different gear rings on gear wheel 2.Different gear ring can the number of teeth equal, each horizontal between cog of having a denture made of different gear ring is all staggered; Also can the number of teeth not etc., outer ring as relative in inner ring interlocks every 2 teeth or more tooth, or 1, interval and multiple promiscuous modes etc.As shown in Figure 8, horizontal tooth 3 mutual dislocation in gear wheel wheel cone circumference of having a denture made of first and second row (is first row by the gear wheel bottom surface) gear ring on gear wheel 2 is arranged.
As preferably six, the tooth top two ends (two ends along tooth top width) of horizontal tooth 3 of having a denture made are provided with rounding or chamfering, as shown in Figure 14,19.
As preferably seven, the cylinder of the inlaid solid part of described horizontal tooth 3 of having a denture made is provided with the dentation vertical bar (being called for short bar tooth) (as Figure 22,24,25) being parallel to tooth axis, and horizontal tooth 3 of having a denture made embeds the mode (as Figure 21,27) of cutter teeth hole wall by bar tooth on inlaid solid part 31 cylinder, or to form the mode of the interference fit of Multi-point contact type inlaid solid in the perforation of gear wheel 2 (as Figure 28) bar tooth and cutter teeth hole.Now, the length of inlaid solid part or width calculate according to the bar tooth convex top profile of its cross section, and as shown in figure 20, the length of inlaid solid part or width surrounds by bar tooth convex top profile 311(region) length or width.
As preferably eight, 4 points of addendum widths of described horizontal tooth 3 of having a denture made are more than or equal to the length L1 of inlaid solid part 31.As shown in 12,22,4 points of addendum widths of horizontal tooth 3 of having a denture made equal the length L1 of inlaid solid part 31; As shown in 15,17,24,25,4 points of addendum widths of horizontal tooth 3 of having a denture made are greater than the length L1 of inlaid solid part 31.
As preferably nine, the gear ring on described gear wheel 2 and fixing cutting teeth 41 radial direction on described stationary cutting structure 4 are arranged with rail.As shown in Figure 3, the gear ring 3a on gear wheel and fixing cutting teeth 41a radial direction is arranged with rail.
As preferably ten, the profile of the cross section of the inlaid solid part 31 in bottom of described horizontal tooth 3 of having a denture made is formed by connecting by both sides circular arc middle straight line segment, as shown in Figure 10,13,16,18,21.Or as shown in figure 11, in figure, the profile (and cross-sectional profiles of gear wheel perforation) of the cross section of the inlaid solid part 31 of horizontal tooth 3 of having a denture made is formed by connecting by both sides circular arc middle circle segmental arc.
As basic example and preferably arbitrary in one to ten more preferably A thereof, the deviant of each gear wheel 2 on bit body 1 is not more than 1.5% of bit diameter.
As basic example and preferably arbitrary in one to ten more preferably B thereof, 4 points of addendum thicknesses of the horizontal tooth 3 of having a denture made on gear wheel 2 are not more than 1/4th of tooth inlaid solid part 31 width, as shown in Figure 13,16,18.
As more preferably A or B further preferably, bit body 1 have at least the gear ring of 50% adopt horizontal tooth 3 of having a denture made, and the span of the tooth top angle of deflection of horizontal tooth 3 of having a denture made be 85 °≤| α |≤90 °, and on bit body 1, the deviant of gear wheel 2 is not more than 0.5% of bit diameter.More preferably, bit body 1 have at least the gear ring of 50% adopt horizontal tooth 3 of having a denture made, and tooth top angle of deflection=90 of horizontal tooth 3 of having a denture made ° (i.e. the addendum line of horizontal tooth 3 of having a denture made and the wheel cone nut line of gear wheel 2 vertical), and gear wheel 2 does not offset (deviant is 0) on bit body 1, as shown in Fig. 1,2,8,9,30.More preferably, horizontal tooth 3 of having a denture made is inner sunken face (as Figure 29) along the side of two on addendum thickness direction, and 4 of tooth points of addendum width W are not less than tooth inlaid solid part 31 width W 1,4 points of addendum thicknesses is not more than 1/4th of tooth inlaid solid part 31 width W 1.
What need special declaration is; above basic example and each be both preferably some embodiments of the present invention; also be various optional enforcement means simultaneously; those skilled in the art are known; above-mentioned various optional enforcement means can carry out various feasible independent assortment; can produce more embodiment thus, it all should in protection scope of the present invention, and in order to support the protection of claim:
Such as, any combination preferably between to ten can become some embodiments; And even, preferably one more preferably (e.g., at least one gear wheel 2 on bit body 1 has at least 1 gear ring all adopt horizontal tooth 3 of having a denture made, and the span of the tooth top angle of deflection of horizontal tooth 3 of having a denture made be 70 °≤| α |≤90 °; Or each gear wheel 2 on bit body 1 has at least 1 gear ring to adopt horizontal tooth 3 of having a denture made, and the span of the tooth top angle of deflection of horizontal tooth 3 of having a denture made be 70 °≤| α |≤90 °; Or each gear wheel on bit body 1 has at least 1 gear ring to adopt 4 points of addendum width W to be not less than the horizontal tooth 3 of having a denture made of the width of the inlaid solid part of tooth 31, and the span of the tooth top angle of deflection of horizontal tooth 3 of having a denture made be 70 °≤| α |≤90 °; Etc.), also and preferably can be combined between two to ten, become more embodiment.More limit citing is not done, those skilled in the art's other more combinations known at this.
All any amendments done within the spirit and principles in the present invention, combination, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (12)
1. one kind wide tooth roller composite drill bit, comprise bit body (1), stationary cutting structure (4) and at least one gear wheel (2), described gear wheel (2) and described stationary cutting structure (4) are arranged on described bit body (1), described stationary cutting structure (4) is provided with fixing cutting teeth (41), described gear wheel (2) is formed by bearing arrangement and described bit body (1) and is rotationally connected, it is characterized in that: described gear wheel (2) is above inlaid solid horizontal tooth of having a denture made (3), and the span of the tooth top angle of deflection of horizontal tooth of having a denture made (3) be 70 °≤| α |≤90 °, the cross-sectional outling of the inlaid solid part (31) of horizontal tooth of having a denture made is non-circular.
2. wide tooth roller composite drill bit as claimed in claim 1, is characterized in that: 4 points of addendum widths of described horizontal tooth of having a denture made (3) are not less than the width of the inlaid solid part of tooth (31).
3. wide tooth roller composite drill bit as claimed in claim 1, it is characterized in that: the dentation vertical bar cylinder of the inlaid solid part (31) of described horizontal tooth of having a denture made (3) being provided with the axis being parallel to tooth, and horizontal tooth of having a denture made (3) embeds the mode of gear wheel (2) perforation wall by dentation vertical bar on inlaid solid part (31) cylinder, or dentation vertical bar and gear wheel (2) perforation to form the interference fit of Multi-point contact type inlaid solid in the perforation of gear wheel (2).
4. wide tooth roller composite drill bit as claimed in claim 1, is characterized in that: fixing cutting teeth (41) radial direction on the gear ring on described gear wheel (2) and described stationary cutting structure (4) is arranged with rail.
5. wide tooth roller composite drill bit as claimed in claim 1, is characterized in that: 4 points of addendum widths of described horizontal tooth of having a denture made (3) are more than or equal to the length of inlaid solid part (31).
6. wide tooth roller composite drill bit as claimed in claim 1, is characterized in that: all or part of interlaced arrangement of horizontal tooth of having a denture made (3) of the different gear rings on described gear wheel (2).
7. the wide tooth roller composite drill bit as described in claim arbitrary in claim 1 to 6, is characterized in that: 4 points of addendum thicknesses of the horizontal tooth of having a denture made (3) on described gear wheel (2) are not more than 1/4th of the inlaid solid part of tooth (31) width.
8. the wide tooth roller composite drill bit as described in claim arbitrary in claim 1 to 6, is characterized in that: the deviant of each gear wheel (2) on described bit body (1) is not more than 1.5% of bit diameter.
9. wide tooth roller composite drill bit as claimed in claim 7, it is characterized in that: the span of the tooth top angle of deflection of described horizontal tooth of having a denture made (3) is 85 °≤| α |≤90 °, and the deviant of the upper gear wheel (2) of bit body (1) is not more than 0.5% of bit diameter.
10. wide tooth roller composite drill bit as claimed in claim 8, it is characterized in that: the span of the tooth top angle of deflection of described horizontal tooth of having a denture made (3) is 85 °≤| α |≤90 °, and the deviant of the upper gear wheel (2) of bit body (1) is not more than 0.5% of bit diameter.
11. wide tooth roller composite drill bits as claimed in claim 9, it is characterized in that: described horizontal tooth of having a denture made (3) is inner sunken face along the side of two on addendum thickness direction, and 4 of tooth points of addendum widths are not less than the inlaid solid part of tooth (31) width, 4 points of addendum thicknesses are not more than 1/4th of the inlaid solid part of tooth (31) width.
12. wide tooth roller composite drill bits as claimed in claim 10, it is characterized in that: described horizontal tooth of having a denture made (3) is inner sunken face along the side of two on addendum thickness direction, and 4 of tooth points of addendum widths are not less than the inlaid solid part of tooth (31) width, 4 points of addendum thicknesses are not more than 1/4th of the inlaid solid part of tooth (31) width.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310063630.9A CN103089153B (en) | 2013-02-28 | 2013-02-28 | Wide-tooth cone composite drill bit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310063630.9A CN103089153B (en) | 2013-02-28 | 2013-02-28 | Wide-tooth cone composite drill bit |
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| CN103089153B true CN103089153B (en) | 2015-01-28 |
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|---|---|---|---|---|
| CN106285490A (en) * | 2016-08-30 | 2017-01-04 | 宝鸡石油机械有限责任公司 | A kind of gear wheel is arranged in the composite drill bit on wing |
| CN106639886A (en) * | 2016-11-24 | 2017-05-10 | 西南石油大学 | Composite drill bit used for breaking rocks in ploughing and cutting combined and alternating mode |
| CN107143287A (en) * | 2017-07-14 | 2017-09-08 | 宜昌神达石油机械有限公司 | Yangtze Cambrian system shale gas exploitation combined bitses during one kind is applicable |
| CN107605407A (en) * | 2017-09-27 | 2018-01-19 | 四川奥格特金刚石钻头有限公司 | A kind of PDC cutter and the composite drill bit containing the PDC cutter |
| CN108952583B (en) * | 2018-07-03 | 2019-10-11 | 中国石油大学(北京) | Composite rotary cutting formula PDC drill bit |
| CN111411899B (en) * | 2020-05-28 | 2023-05-26 | 西南石油大学 | PDC drill bit with self-impact capability |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7776256B2 (en) * | 2005-11-10 | 2010-08-17 | Baker Huges Incorporated | Earth-boring rotary drill bits and methods of manufacturing earth-boring rotary drill bits having particle-matrix composite bit bodies |
| RU2465429C2 (en) * | 2007-05-30 | 2012-10-27 | Хэллибертон Энерджи Сервисиз, Инк. | Rotary drilling bit with calibrating platforms, which has increased controllability and reduced wear |
| CN102434105B (en) * | 2011-11-30 | 2015-06-24 | 四川深远石油钻井工具股份有限公司 | Composite bit with rotary cut rock-breaking function |
| CN102400646B (en) * | 2011-11-30 | 2015-05-20 | 四川深远石油钻井工具股份有限公司 | Composite bit formed by rotary cut bit and roller bit |
| CN102392605A (en) * | 2011-11-30 | 2012-03-28 | 四川深远石油钻井工具有限公司 | Compound bit formed by PDC (polycrystalline diamond compact) bits and rotary cutting bit |
| CN102678050B (en) * | 2012-05-18 | 2015-10-28 | 西南石油大学 | A kind of have the gear wheel composite drill bit impacting cutting structure |
| CN102747960A (en) * | 2012-07-11 | 2012-10-24 | 江汉石油钻头股份有限公司 | Hybrid drill bit |
| CN203248082U (en) * | 2013-02-28 | 2013-10-23 | 西南石油大学 | Wide-tooth cone compound bit |
-
2013
- 2013-02-28 CN CN201310063630.9A patent/CN103089153B/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN103089153A (en) | 2013-05-08 |
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