CN202194574U - Compound drill bit - Google Patents
Compound drill bit Download PDFInfo
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- CN202194574U CN202194574U CN2011202507991U CN201120250799U CN202194574U CN 202194574 U CN202194574 U CN 202194574U CN 2011202507991 U CN2011202507991 U CN 2011202507991U CN 201120250799 U CN201120250799 U CN 201120250799U CN 202194574 U CN202194574 U CN 202194574U
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Abstract
本实用新型公开了一种复合式钻头，包括钻头本体（1）、轮刀（2），所述钻头本体（1）上具有轮掌（3），所述轮刀（2）安装在所述轮掌（3）的轴颈（6）上，与轮掌（3）形成转动连接，在所述轮刀（2）上布置有外排切削齿圈（4），所述轮刀（2）的偏移角α的范围是20°≤|α|≤90°，在所述钻头本体（1）上设置有包含固定切削齿（8a）的固定切削结构（8）。本实用新型中轮刀上的切削齿以交替刮切的形式破岩，并配合固定切削结构上的切削齿，在井底岩石上形成交叉切削区域，破岩效率高，磨损均匀，冷却效果好，齿的寿命长，轴承工作寿命高，钻头使用寿命长。
The utility model discloses a composite drill bit, which comprises a drill body (1) and a wheel cutter (2). The drill body (1) has a wheel palm (3), and the wheel cutter (2) is installed on the On the journal (6) of the wheel palm (3), it forms a rotational connection with the wheel palm (3), and an outer row of cutting ring gears (4) is arranged on the wheel cutter (2), and the wheel cutter (2) The range of the offset angle α is 20°≤|α|≤90°, and a fixed cutting structure (8) including fixed cutting teeth (8a) is arranged on the drill bit body (1). The cutting teeth on the wheel cutter in the utility model break rocks in the form of alternate scraping and cutting, and cooperate with the cutting teeth on the fixed cutting structure to form a cross cutting area on the rock at the bottom of the well, with high rock breaking efficiency, uniform wear and good cooling effect , Long service life of the teeth, high working life of the bearing, long service life of the drill bit.
Description
Technical field
The utility model belongs to drilling equipment technical fields such as petroleum gas, mine engineering, building foundation engineering construction, geology, the hydrology, relates to a kind of combined drill concretely.
Background technology
Drill bit be in the drilling engineering in order to fractured rock, form the rock crushing tool of pit shaft.Employed drill bit mainly contains rock bit (comprising tricone bit and single-cone rotary drill bit) and PDC (composite polycrystal-diamond) drill bit in the drilling engineering now.
Tricone bit is mainly with the broken rock of the form of impacting crushing.The wheel body speed ratio of tricone bit (ratio of gear wheel rotating speed and drill speed during the drill bit rotary drilling) is all greater than 1; The gear wheel rotating speed is fast during the drill bit rotary drilling; Tooth on the gear wheel forms bottom rock and impacts the broken rock of granulitization, and capacity usage ratio is not high, and efficiency of breaking rock is relatively low.The broken rock mode of impact crushing of tricone bit, the shock loading that bearing is received is big, and the load amplitude is high, and the bearing rotating speed is very fast relatively in addition, so the bearing life of tricone bit is shorter.The gear wheel deviation angle of existing rock bit is scarcely above 5 °; Drill bit is in the shaft bottom during rotary drilling; The wheel body speed ratio is high, and gear wheel is fast around the velocity of rotation of bit leg journel, and the contacted time of tooth on the gear wheel and bottom rock is very short; The distance of tooth slippage in the shaft bottom is also very short, and tooth stamps out pit one by one on bottom rock.
Single-cone rotary drill bit gear wheel rotating speed is low, mainly to scrape the broken rock of the form of cutting.The bit bearing size is bigger, and the life-span is superior to tricone bit.But single-cone rotary drill bit also has a unavoidable weakness, and that is exactly a tooth abrasion resistance wretched insufficiency, in case the tooth blunt, drilling speed will sharply reduce.
Now, movement-less part, long PDC (composite polycrystal-diamond) drill bit of wear-resisting and life-span use more and morely in drilling engineering, and ratio is increasing.Existing P DC drill bit all belongs to fixed cutter drill bits.Under desirable condition of work (being the condition that center line of bit overlaps with hole axis), to be responsible for broken zone be relatively-stationary concentric circles endless belt to each cutting teeth when drill bit crept into.This fixed teeth PDC drill bit mainly contains the shortcoming of three aspects: first; The PDC tooth is rock cutting continuously; Because violent fricative heat can make tooth reach quite high temperature, when temperature delimited above one, the rate of wear of PDC tooth obviously rose; Thereby cause the generation of (when PDC tooth operating temperature was higher than a certain specified temp, the phenomenon that its abrasion resistance obviously descends was called the thermal wear phenomenon of PDC tooth) of thermal wear phenomenon.The second, the inefficacy of indivedual teeth on the drill bit (the coming off of tooth, fracture or excessive wear etc.) can significantly increase near the live load of the PDC tooth the endless belt of inefficacy tooth shaft bottom, accelerates its rate of wear, and then causes drill bit to lose efficacy in advance.The 3rd, the rate of wear obvious difference of the PDC tooth on the different radial zones of drill bit, the tooth that the cutter-wear rate in general bit exterior zone (particularly outer 1/3 zone of drill bit radius) is obviously regional faster than heart portion.
We have proposed a kind of combined drill with the broken rock of cutting way in patent 201010229371.9 and 201020261941.8.Cutting teeth on the flywheel knife of this combined drill (or runner) phenomenon of cutting teeth " with the rail cutting " possibly occur in actual drilling process.So-called " with the rail cutting " just is meant, drill bit is in the rotary drilling process, and cutting teeth and rock fall into the phenomenon of the broken groove (or hole) that a broken rock process stays on the shaft bottom as the time spent.When " with the rail cutting " took place the cutting teeth on the flywheel knife, cutting teeth got in the original broken groove in shaft bottom, has both reduced the rock cutting output, has increased the difficulty of cutting teeth wedging rock again.So " with the rail cutting " phenomenon will have a negative impact to the efficiency of breaking rock of drill bit.
The utility model content
The goal of the invention of the utility model provides a kind of combined drill; Drill bit is composited by big deviation angle flywheel knife cutting unit and stationary cutting structure, and big deviation angle flywheel knife cutting unit makes cutting teeth on the flywheel knife alternately to scrape butt formula fractured rock, cutting teeth on the stationary cutting structure and the cutting teeth acting in conjunction on the flywheel knife; Intersect and cut bottom rock; Form netted shaft bottom pattern, can when increasing drilling life of bit, improve efficiency of breaking rock.
The technical scheme of the utility model is following:
A kind of combined drill; Comprise drill body and at least one group of flywheel knife cutting unit that is arranged on the said drill body; Said flywheel knife cutting unit comprises the flywheel knife and the wheel palm; The said palm of taking turns is arranged on the drill body, and said flywheel knife is arranged on the axle journal of the wheel palm to form with the wheel palm and is rotationally connected, and on said flywheel knife, is furnished with and effluxes the cutting gear ring; It is characterized in that: the scope of the offset angle of said flywheel knife be 20 °≤| α |≤90 °, said drill body is provided with at least one group and comprises the fixedly stationary cutting structure of cutting teeth.
The described a kind of combined drill of the utility model, its said flywheel knife cutting unit has two groups at least, wherein has at least the deviation angle of flywheel knife of deviation angle and other group flywheel knife cutting unit of flywheel knife of one group of flywheel knife cutting unit unequal.
The described a kind of combined drill of the utility model, its said flywheel knife cutting unit has two groups at least, wherein has at least the external diameter size of flywheel knife of one group of flywheel knife cutting unit unequal with the external diameter size of the flywheel knife of other group flywheel knife cutting unit.
The described a kind of combined drill of the utility model, its said flywheel knife cutting unit has two groups at least, wherein has at least the axial rake of flywheel knife of axial rake and other group flywheel knife cutting unit of flywheel knife of one group of flywheel knife cutting unit unequal.
The described a kind of combined drill of the utility model, its said flywheel knife cutting unit has two groups at least, wherein has at least the cloth space width of one group of cutting teeth on the flywheel knife cutting unit flywheel knife and the cloth space width on other group flywheel knife cutting unit flywheel knife inequality.
The described a kind of combined drill of the utility model, the cutting teeth unequal-interval on its said same flywheel knife is arranged.
In the said structure; The offset angle of said flywheel knife=
; Wherein s is the wheelbase that moves of flywheel knife, and c is the stand-off of flywheel knife.Like Fig. 3, Fig. 4, shown in Figure 5, AB is a drill bit central axis, and CD is the flywheel knife central axis, is flywheel knife pole axis face A through flywheel knife axis CD and the face that is parallel to drill axis AB
1, A
2Be through drill axis AB and perpendicular to flywheel knife pole axis face A
1The plane, A
3Be to pass through drill axis AB and be parallel to flywheel knife pole axis face A
1The plane.The point that characterizes each cutting teeth position coordinates on the flywheel knife is the anchor point of each cutting teeth, and the anchor point of cylindrical PDC tooth is the central point of the diamond working face of tooth, and the anchor point of other type cutting teeth is arranged on certain specified point of tooth.Flywheel knife effluxes the plane A at each cutting teeth anchor point place on the gear ring
4Be the flywheel knife reference plane, flywheel knife reference plane A
4With the intersection point E of flywheel knife axis CD be the flywheel knife reference point.Cross some E and make vertical line to drill axis AB, intersection point is F.Flywheel knife stand-off c be flywheel knife reference point E to the plane A
2Distance; Flywheel knife moves wheelbase s and is drill axis AB and flywheel knife pole axis face A
1Between distance, and regulation is seen to the bit adapter hand of spiral along drill axis from flywheel knife (promptly against drill bit drilling direction see) to make flywheel knife reference point E be positioned at plane A
2The left side, if this moment is pole axis face A
1The A on the plane
3The below then is the axle of shuffling, otherwise, then be the negative axle (shown in Figure 5 for shuffling axle, shown in Figure 6 is the negative axle that moves) that moves; The offset angle of flywheel knife is straight line EF and plane A
3Between angle, promptly have offset angle=
, a hour offset angle α that shuffles bears and moves a hour offset angle α for negative for just; The axial rake β of flywheel knife is flywheel knife axis CD and perpendicular to the angle between the plane of drill axis AB.
When drill bit under the driving of the pressure of the drill, moment of torsion during rotary drilling; Flywheel knife is rotating and outside axis is done axial feed motion around drill axis with drill body; Also can rotate motion, promptly can rotate around the center line of journal (being the flywheel knife axis) of the wheel palm with respect to drill body.If the deviation angle of flywheel knife equals zero; The axis of flywheel knife and drill axis intersect; Flywheel knife can roll on bottom rock with pure rolling or the mode that approaches pure rolling, and its mean speed equals or is approximately equal to by drill speed and the determined pure rolling speed of flywheel knife rolling track radius of circle.At this moment, flywheel knife will be that instantaneous center of rotation relatively rotates with the application point of the cutting teeth that acts on mutually with bottom rock, not have relative slippage between cutting teeth and the rock.If the deviation angle of flywheel knife is not equal to zero, then the axis of flywheel knife and drill axis are no longer crossing, but the space is staggered, and the pure rolling condition of flywheel knife is no longer satisfied.At this moment, flywheel knife still can roll on rock, but its rolling speed no longer equals pure rolling speed, but is lower than pure rolling speed.Relative slippage can take place with rock in the cutting teeth on the flywheel knife in rolling across the process of rock, thereby form cutting teeth scraping of rock cut or shear action.
When deviation angle was non-vanishing, the relative slippage (scrape cut) of the cutting teeth on the flywheel knife on bottom rock comprised two parts: the first, and radial slippage.The process of cutting teeth on the flywheel knife from beginning rock cutting (incision) to disengaging rock cutting (cutting out); Cutting point on the rock is different with radially (drill bit radially) position that cuts out a little; Show cutting teeth with process that rock contacts in radial slippage has taken place; Cutting point and cut out a little between radial distance, represented the radial slippage amount of cutting teeth.Deviation angle is big more, and cutting teeth incision, the radial distance between cutting out a little are big more, and the radial slippage amount is also just big more.The second, circumferentially slippage.When drill speed was confirmed, the wheel body speed ratio had determined the cutwork time (promptly from the incision rock to time that the cutting at one time process that cuts out rock is experienced) of cutting teeth.Because the wheel body speed ratio when deviation angle is non-vanishing is lower than the wheel body speed ratio under the pure rolling condition, the rotating speed of flywheel knife is slack-off, so the cutwork time of cutting teeth is elongated, thereby cutting teeth is produced along the slippage of circumferential (drill bit circumferencial direction).The wheel body speed ratio is more little, and the cutwork time of cutting teeth is long more, and circumferentially slippage is also just big more.The total sliding velocity of cutting teeth on bottom rock is that radial slippage speed is synthetic with the vector of circumferential sliding velocity.According to the motion feature of bit body and flywheel knife, cutting teeth is the similar helix shape of when negative (deviation angle for) along (deviation angle is correct time) from outside to inside of drill bit direction of rotation or from inside to outside at the slippage on the bottom rock (scrape and cut) track.
Flywheel knife move that wheelbase s increases or stand-off c reduces, all cause the flywheel knife offset angle to increase, the former capital can increase the radial slippage and circumferentially slippage of cutting teeth in the shaft bottom, promptly increases the total slippage of cutting teeth in the shaft bottom.
The offset angle of above-mentioned flywheel knife=
, thus make 20 °≤| α | realize that better cutting teeth is to scrape the broken rock of the mode of cutting for≤90 °.Concretely, certain when outside diameter, when the flywheel knife diameter remained unchanged, what increase flywheel knife moved wheelbase s, and the stand-off c of flywheel knife will correspondingly reduce.
In the utility model; The broken rock mode that has adopted stationary cutting structure to combine with flywheel knife: flywheel knife and stationary cutting structure are the cutting structure with the broken bottom rock of cutting way; Cutting teeth on the stationary cutting structure is scraped the Cutting trajectory that cuts out concentric circles on bottom rock, and the cutting teeth on the flywheel knife is scraped on bottom rock and cut out from outside to inside or spirality Cutting trajectory from inside to outside.Two cover Cutting trajectories intersect each other, and its effect is to form netted shaft bottom pattern, helps the effective wedging of cutting teeth to rock, helps the fragmentation of rock, so can effectively improve the efficiency of breaking rock of drill bit.
As far as fixed cutter drill bits; Cutting teeth cuts bottom rock continuously; The rate of wear difference of the PDC tooth on the different radial zones of drill bit is fairly obvious, obviously regional faster than the heart portion tooth of the rate of wear of general bit exterior zone (particularly outer 1/3 zone of drill bit radius) cutting teeth.Cutting teeth on the flywheel knife in the utility model can play special booster action with failed areas to the cutting teeth of fixed cutter drill bits is easy to wear.Cutting teeth on the flywheel knife is scraped in turn with the form that slowly replaces and is cut brokenly rock, the actual participation cutwork of each cutting teeth obviously be less than the duration of runs of drill bit total time, so the rate of wear of cutting teeth significantly reduces.The reduction meeting of cutter-wear rate causes direct influence to the cutting teeth on the stationary cutting structure on the flywheel knife, slows down its rate of wear.Cutting teeth position the most easy to wear is corresponding on the intersection cutting zone in shaft bottom or netted cutting zone and the drill bit, helps reducing the service load of this position cutting teeth, reduces the rate of wear.So the combined drill of the utility model is easier to realize the balance abrasion of cutting teeth on the one hand, can significantly improve the working life of drill bit on the other hand.
The alternately cutwork mode of the cutting teeth on the flywheel knife helps the cooling of cutting teeth (particularly PDC tooth), avoids or reduced the generation of the thermal wear phenomenon of aggravating of causing wearing and tearing owing to temperature is too high.
As far as conventional fixed teeth drill bit, increase the rate of wear that cloth tooth density can be slowed down cutting teeth, increase the working life of drill bit, but also can reduce the rate of penetration of drill bit simultaneously.In the utility model, can arrange more cutting teeth on the flywheel knife, increased cutting teeth quantity, and the cutting teeth on the flywheel knife can take turns to operate.Because that participates in rock cutting on the flywheel knife simultaneously has only the part cutting teeth, so effective work number of teeth of drill bit is significantly less than total cutting number of teeth of drill bit.In other words, the flywheel knife cutting structure can be when increasing total cutting number of teeth (increasing cloth tooth density), and the number of teeth that maintenance is worked simultaneously is constant or constant basically.Its effect is when keeping the drill bit rate of penetration, to make the working life of drill bit be able to prolong.Like this, the contradiction that in drill bit design, prolongs between bit life and the raising drilling speed can significantly be alleviated.
Because the cutting teeth on the flywheel knife is with cutting way (cut mode) fractured rock; The required axial weight on bit of flywheel knife is less relatively; The pressure of the drill fluctuating range is also less; And the wheel body speed ratio of combined bits is lower than tricone bit, thereby combined bits can reach the bearing life higher than tricone bit.
The thinking of the utility model is: the mode of moving wheelbase s, reducing the stand-off c of flywheel knife through increasing flywheel knife increases the flywheel knife offset angle; And make its 20 °≤| α | in≤90 ° of scopes; Reach the cutting teeth that increases on the flywheel knife radial slippage amount in the shaft bottom; And reduce the wheel body speed ratio simultaneously, increase cutting teeth the shaft bottom scrape the time of cutting and circumferential slippage, thereby increase cutting teeth total slippage (scraping the amount of cutting) on bottom rock.Like this; When drill bit is worked in the shaft bottom; Cutting teeth on the flywheel knife is with the rock of speed incision slowly; And scrape at relative bottom rock under the drive of bit body and slowly to cut out again after cutting one section long distance, thereby realize that the cutting teeth on the flywheel knife scrapes the purpose of cutting or cutting brokenly rock in turn with the form that slowly replaces in the shaft bottom.Be equipped with simultaneously and have the fixedly stationary cutting structure of cutting teeth; The acting in conjunction effect of two cover Cutting trajectories is to form the intersection cutting zone in the shaft bottom; Help the effective wedging of cutting teeth, help the fragmentation of rock, so can effectively improve the efficiency of breaking rock of drill bit rock.
The utility model compared with prior art, its beneficial effect is:
(1) the present invention combines flywheel knife with fixing cutting unit; On bottom rock, formed two cover Cutting trajectories, its effect is to form intersection cutting zone and netted shaft bottom pattern in the shaft bottom, and cutting force and the cutting power of cutting teeth under this condition all reduces; Help slowing down the rate of wear of cutting teeth; Also help the effective wedging of cutting teeth, help the fragmentation of rock, can significantly improve the efficiency of breaking rock of drill bit rock.Particularly when the exterior zone the most easy to wear of cutting teeth on the intersection cutting zone in shaft bottom or mesh-like area and the drill bit is corresponding; Can reduce the cutting force and the cutting power of this zone cutting teeth; Slow down its rate of wear, this is very useful for improving efficiency of breaking rock and the working life of drill bit when bad ground creeps into.
(2) the cutting teeth alternation on the flywheel knife reduces or has avoided fixed cutter drill bits because of the drill bit initial failure that the minority cutting teeth lost efficacy and brings, and has prolonged drilling life of bit.
(3) the cutting teeth alternation on the flywheel knife, the cutting teeth wearing and tearing are even, and the ability to work of each cutting teeth can be fully used.
(4) the cutting teeth alternation on the flywheel knife, good cooling results is difficult for taking place thermal wear.
(5) combined drill can utilize diamond composite components such as PDC composite sheet as cutting teeth, and the working life of tooth and stock-removing efficiency all are superior to single-cone rotary drill bit.
The pressure of the drill required when (6) combined drill creeps into is little, and the suffered load of bearing is little, and the load fluctuation amplitude is low; The wheel body speed ratio of drill bit is low, lacks so bearing relatively rotates slowly, generates heat.So the bearing working life-span of combined drill is longer than the tricone bit of equal specification.
For reducing and avoid the generation of cutting teeth on the flywheel knife " with the rail cutting " phenomenon, the utility model can take following further improvement project to realize:
Said flywheel knife cutting unit has two groups at least, wherein has at least the deviation angle of flywheel knife of deviation angle and other group flywheel knife cutting unit of flywheel knife of one group of flywheel knife cutting unit unequal.
Said flywheel knife cutting unit has two groups at least, wherein has at least the external diameter size of flywheel knife of one group of flywheel knife cutting unit unequal with the external diameter size of the flywheel knife of other group flywheel knife cutting unit.
Said flywheel knife cutting unit has two groups at least, wherein has at least the axial rake of flywheel knife of axial rake and other group flywheel knife cutting unit of flywheel knife of one group of flywheel knife cutting unit unequal.
Said flywheel knife cutting unit has two groups at least, wherein has at least the cloth space width of one group of cutting teeth on the flywheel knife cutting unit flywheel knife and the cloth space width on other group flywheel knife cutting unit flywheel knife inequality.
Cutting teeth unequal-interval on the said same flywheel knife is arranged.
It is inequality with the cloth space width of inboard cutting gear ring to efflux the cutting gear ring on the said same flywheel knife.
The beneficial effect of such scheme is:
(7) the cutting teeth unequal-interval on unequal, the flywheel knife of the deviation angle of flywheel knife external diameter size unequal, flywheel knife axial rake unequal, flywheel knife arrange, respectively arrange on the flywheel knife cloth space width of cutting teeth inequality or (with) the cloth space width and the cloth space width on other flywheel knife of cutting teeth on the flywheel knife be inequality; Can reduce and avoid the generation of cutting teeth " with the rail cutting " phenomenon on the flywheel knife in the drilling process; Make the cutting teeth on the flywheel knife scrape and cut brokenly rock along " phacolith " (rock band of convexity between the two broken grooves) of bottom rock; Help cutting teeth to the effective wedging of rock and the fragmentation of rock, so can effectively improve the efficiency of breaking rock of drill bit.
(8) adopt such scheme; Can reduce and avoid the generation of cutting teeth " with the rail cutting " phenomenon on the flywheel knife in the drilling process; Cutting teeth on the flywheel knife is scraped along " phacolith " of bottom rock cut brokenly rock, can reduce and avoid protruding " phacolith " wear damage the flywheel knife body.
To sum up, the cutting teeth among the present invention on the flywheel knife breaks rock alternately to scrape the form of cutting, and the cutting teeth on the matching and fixing cutting structure, on bottom rock, forms the intersection cutting zone; Efficiency of breaking rock is high, and wearing and tearing are even, good cooling results; The life-span of tooth is long, and the bearing working life-span is high, and drilling life of bit is long.
Description of drawings
The utility model will explain through example and with reference to the mode of accompanying drawing, wherein:
Fig. 1 is the structural representation of the utility model, and its flywheel knife cutting unit and stationary cutting structure are 2 groups, both alternate layouts.Among the figure: 1, drill body, 2, flywheel knife, 3, the wheel palm, 4, efflux the cutting gear ring, 7, nozzle, 8, stationary cutting structure, 8a, fixing cutting teeth;
Fig. 2 is the view of the utility model when drill axis is overlooked (contrary drill bit drilling direction see);
Fig. 3 moves the sketch map of wheelbase s, stand-off c, offset angle and axial rake β for the flywheel knife geometric position parameter of the utility model;
Fig. 4 is that the flywheel knife of one group of cutting unit of the utility model is along the sectional view of flywheel knife pole axis face.Among the figure: 6, axle journal;
Fig. 5 is the sketch map of the utility model relative geometry position and the parameter s of flywheel knife on drill bit, c, α when drill axis is overlooked, the diagram deviation angle be on the occasion of;
Fig. 6 is the sketch map of the flywheel knife deviation angle of the utility model when unequal; Among the figure, α 1 ≠ α 2;
Fig. 7 is the sketch map of the flywheel knife external diameter size of the utility model when unequal; Among the figure, r1 ≠ r2;
Fig. 8 is the sketch map of the flywheel knife axial rake of the utility model when unequal; Among the figure, β 1 ≠ β 2;
Fig. 9 is the cutting teeth cloth space width anisochrouous sketch map on the flywheel knife of the utility model;
Figure 10 be the utility model drill bit under flywheel knife cutting unit and stationary cutting structure acting in conjunction, intersect in the shaft bottom and to scrape the netted scratch sketch map that cuts out.
The specific embodiment
Below in conjunction with accompanying drawing, the utility model is done detailed explanation.
For the purpose, technical scheme and the advantage that make the utility model is clearer,, the utility model is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
Like Fig. 1,2,3,4, shown in 5: a kind of combined drill, comprise drill body 1, flywheel knife 2, have the wheel palm 3 on the said drill body 1; Said flywheel knife 2 is installed in said the wheel on the palm 3 the axle journal 6; Form with the wheel palm 3 and to be rotationally connected, on said flywheel knife 2, be furnished with and efflux cutting gear ring 4, it is characterized in that: the scope of the offset angle of said flywheel knife 2 be 20 °≤| α |≤90 °; Drill body 1 is provided with stationary cutting structure 8, is consolidated with fixedly cutting teeth 8a on the stationary cutting structure 8.
The scope of the offset angle of flywheel knife 2 20 °≤| α | in the time of≤90 °, can realize that drill bit creeps into cutting teeth on the hour wheel cutter 2 and scrapes in turn with the form that slowly replaces and cut brokenly rock.Under the acting in conjunction of flywheel knife cutting unit and stationary cutting structure, two cover Cutting trajectories intersect each other, and drill bit is scraped in the shaft bottom and cut out netted broken pattern.
Shown in figure 10; Cutting teeth on the flywheel knife cutting unit is scraped and is cut out similar spiral yarn shaped scratch 10; Fixedly cutting teeth on the stationary cutting structure is scraped and is cut out circular concentric scratch 9, and flywheel knife cutting unit and stationary cutting structure cooperate can realize staggered complicated netted shaft bottom pattern.
For reducing and avoid the generation of cutting teeth " with the rail cutting " phenomenon on the flywheel knife, the utility model can adopt following embodiment:
Said flywheel knife cutting unit has two groups at least, wherein has at least the deviation angle of flywheel knife of deviation angle and other group flywheel knife cutting unit of flywheel knife of one group of flywheel knife cutting unit unequal.As shown in Figure 6, the deviation angle of two flywheel knives is unequal, α
1≠ α
2If the flywheel knife cutting unit is three groups, then the deviation angle of the flywheel knife in one group of flywheel knife cutting unit is α
1, other two groups all is α
2, α
1≠ α
2, one is α in perhaps other two groups
2, another is α
3, α
2≠ α
3
Said flywheel knife cutting unit has two groups at least, wherein has at least the external diameter size of flywheel knife of one group of flywheel knife cutting unit unequal with the external diameter size of the flywheel knife of other group flywheel knife cutting unit.As shown in Figure 7, the external diameter of two flywheel knives is unequal, r
1≠ r
2If the flywheel knife cutting unit is three groups, then the external diameter of the flywheel knife in one group of flywheel knife cutting unit is r
1, other two groups all is r
1, r
1≠ r
2, one is r in perhaps other two groups
2, another is r
3, r
2≠ r
3
Said flywheel knife cutting unit has two groups at least, wherein has at least the axial rake of flywheel knife of axial rake and other group flywheel knife cutting unit of flywheel knife of one group of flywheel knife cutting unit unequal.As shown in Figure 8, the axial rake of two flywheel knives is unequal, β
1≠ β
2If the flywheel knife cutting unit is three groups, then the axial rake of the flywheel knife in one group of flywheel knife cutting unit is β
1, other two groups all is β
2, β
1≠ β
2, one is β in perhaps other two groups
2, another is β
3, β
2≠ β
3
Said flywheel knife cutting unit has two groups at least, wherein has at least the cloth space width of one group of cutting teeth on the flywheel knife cutting unit flywheel knife and the cloth space width on other group flywheel knife cutting unit flywheel knife inequality.
Cutting teeth unequal-interval on the said same flywheel knife is arranged.As shown in Figure 9, the cloth space width on the flywheel knife between cutting teeth is unequal.
The above is merely the preferred embodiment of the utility model; Not in order to restriction the utility model; Any modification of being done within all spirit and principles at the utility model, be equal to replacement and improvement etc., all should be included within the protection domain of the utility model.
Claims (6)
1. combined drill; Comprise drill body (1) and at least one group of flywheel knife cutting unit that is arranged on the said drill body (1); Said flywheel knife cutting unit comprises the flywheel knife (2) and the wheel palm (3); The said palm (3) of taking turns is arranged on the drill body (1); The axle journal (6) that said flywheel knife (2) is arranged on the wheel palm (3) is gone up to form with the wheel palm (3) and is rotationally connected; On said flywheel knife (2), be furnished with efflux the cutting gear ring (4), it is characterized in that: the scope of the offset angle of said flywheel knife (2) be 20 °≤| α |≤90 °, said drill body (1) is provided with at least one group and comprises the fixedly stationary cutting structure (8) of cutting teeth (8a).
2. a kind of combined drill according to claim 1; It is characterized in that: said flywheel knife cutting unit has two groups at least, wherein has at least the deviation angle of flywheel knife (2) of deviation angle and other group flywheel knife cutting unit of flywheel knife (2) of one group of flywheel knife cutting unit unequal.
3. a kind of combined drill according to claim 1 and 2; It is characterized in that: said flywheel knife cutting unit has two groups at least, wherein has at least the external diameter size of flywheel knife (2) of one group of flywheel knife cutting unit unequal with the external diameter size of the flywheel knife (2) of other group flywheel knife cutting unit.
4. a kind of combined drill according to claim 1 and 2; It is characterized in that: said flywheel knife cutting unit has two groups at least, wherein has at least the axial rake of flywheel knife (2) of axial rake and other group flywheel knife cutting unit of flywheel knife (2) of one group of flywheel knife cutting unit unequal.
5. a kind of combined drill according to claim 1 and 2; It is characterized in that: said flywheel knife cutting unit has two groups at least, wherein has at least the cloth space width of one group of cutting teeth on the flywheel knife cutting unit flywheel knife and the cloth space width on other group flywheel knife cutting unit flywheel knife inequality.
6. a kind of combined drill according to claim 1 and 2 is characterized in that: the cutting teeth unequal-interval on the said same flywheel knife (2) is arranged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202507991U CN202194574U (en) | 2011-07-15 | 2011-07-15 | Compound drill bit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202507991U CN202194574U (en) | 2011-07-15 | 2011-07-15 | Compound drill bit |
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|---|---|
| CN202194574U true CN202194574U (en) | 2012-04-18 |
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| CN2011202507991U Expired - Fee Related CN202194574U (en) | 2011-07-15 | 2011-07-15 | Compound drill bit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103147692A (en) * | 2013-02-28 | 2013-06-12 | 西南石油大学 | Gear-fixed cutting structure composite drill bit |
| CN108868622A (en) * | 2017-05-12 | 2018-11-23 | 西南石油大学 | One kind is compound to scrape cut type diamond bit |
-
2011
- 2011-07-15 CN CN2011202507991U patent/CN202194574U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103147692A (en) * | 2013-02-28 | 2013-06-12 | 西南石油大学 | Gear-fixed cutting structure composite drill bit |
| CN103147692B (en) * | 2013-02-28 | 2015-11-18 | 西南石油大学 | A kind of gear wheel-stationary cutting structure composite drill bit |
| CN108868622A (en) * | 2017-05-12 | 2018-11-23 | 西南石油大学 | One kind is compound to scrape cut type diamond bit |
| CN108868622B (en) * | 2017-05-12 | 2020-06-05 | 西南石油大学 | Composite scraping type diamond drill bit |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120418 Termination date: 20170715 |
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| CF01 | Termination of patent right due to non-payment of annual fee |