CN201751525U - Combined type drill bit for breaking rock by cutting manner - Google Patents
Combined type drill bit for breaking rock by cutting manner Download PDFInfo
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- CN201751525U CN201751525U CN2010202619418U CN201020261941U CN201751525U CN 201751525 U CN201751525 U CN 201751525U CN 2010202619418 U CN2010202619418 U CN 2010202619418U CN 201020261941 U CN201020261941 U CN 201020261941U CN 201751525 U CN201751525 U CN 201751525U
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Abstract
The utility model discloses a combined type drill bit for breaking rock by a cutting manner, comprising a drill bit body (1) and a rotating wheel (2), wherein the drill bit body (1) is provided with a wheel palm (3); the rotating wheel (2) is installed on a shaft neck (6) of the wheel palm (3), and is in rotary connection with the wheel palm (3); a discharge cutting gear ring (4) is arranged on the rotating wheel (2); the range of the deviation angle Alpha of the rotating wheel (2) is as follows: absolute value of the Alpha is more than or equal to 20 degrees and less than or equal to 90 degrees; and the drill bit body (1) is provided with a fixed cutting structure (8) comprising fixed cutting teeth (8a). In the utility model, the cutting teeth on the rotating wheel break rock in a mode of alternative cutting, and are matched with the cutting teeth on the fixed cutting structure, so that a mesh type breaking area is formed on the rock on the well bottom; the rock breaking efficiency is high, the abrasion is uniform, the cooling effect is good, the service life of the teeth is long, the service lives of a bearing and the drill bit are long.
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 with the broken rock of cutting way 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, and the tooth on the gear wheel forms bottom rock and impacts granulitization.The compressive strength of rock is all much higher than shear strength and tensile strength, and tricone bit utilizes tooth that the punching press of rock is used for brokenly rock, and capacity usage ratio is not high, and efficiency of breaking rock is relatively low.Particularly when deep formation crept into, the cuttings hold-down effect in shaft bottom was fairly obvious under the high density drilling fluid action condition, and tooth is difficult to be pressed into the stratum and forms effectively broken.Bearing life is low to be one of the principal element in restriction tricone bit application life.Because tricone bit is that the impact that bearing is subjected to is big with the broken rock of the form of impacting crushing, load amplitude height, 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 when the rotary drilling of shaft bottom, wheel body speed ratio height, gear wheel is fast around the velocity of rotation of bit leg journel, the contacted time of tooth on the gear wheel and bottom rock is very short, and tooth is also very short in the distance of shaft bottom slippage, and tooth stamps out pit 11 one by one on bottom rock, as shown in figure 21, pit 11 is along the circumferential direction all very short with the length of radial direction.
The single-cone rotary drill bit bearing size is bigger, and the gear wheel rotating speed is low, and the life-span is better than 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, arranges and is cemented on the drill body according to certain rules as the composite polycrystal-diamond (be the PDC tooth, also be called for short tooth) of cutting element, constitutes the cutting structure of PDC drill bit fractured rock.In order in time the shaft bottom to be carried into ground by the landwaste of drill bit fragmentation, also in order to clean drill bit and cooling cutting teeth, also need have hydraulic structure on the PDC drill bit simultaneously.Hydraulic structure is made up of drill bit inner flow passage, outer flow passage and spray-hole usually.Spray-hole claims nozzle again, can be the fixed nozzle that is set directly on the drill body, also can be mounted in the replaceable nozzle on the drill bit.For cutting structure and the hydraulic structure that makes drill bit reaches better work effect, in design, when making drill bit, usually according to certain rules the PDC tooth is divided into some groups, PDC tooth on the same group is cemented on the same toothholder, each toothholder and the PDC tooth that distributes thereon constitute a cutting structure unit, are called wing (toothholder is the wing body).Groove between the wing has just formed the outer flow passage of drill bit.This drill bit is a blade PDC bit.Blade PDC bit is the major structural types of PDC drill bit.
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 delimits above one, the rate of wear of PDC tooth obviously rises, 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 cutter-wear rate in general bit exterior zone (particularly outer 1/3 zone of drill bit radius) are obviously faster than the tooth in heart portion zone.
The utility model content
The purpose of this utility model provides a kind of combined drill with the broken rock of cutting way, drill bit is composited by big deviation angle runner cutting unit and stationary cutting structure, big deviation angle runner cutting unit makes the cutting teeth on the runner replace fractured rock to scrape the butt formula, cutting teeth on the stationary cutting structure and the cutting teeth acting in conjunction on the runner, form netted shaft bottom pattern, can when increasing drilling life of bit, improve efficiency of breaking rock.
The technical solution of the utility model is as follows:
A kind of combined drill with the broken rock of cutting way, comprise drill body, runner, has the wheel palm on the described drill body, described runner is installed on the described axle journal of taking turns the palm, be rotationally connected with the formation of the wheel palm, on described runner, be furnished with and efflux the cutting gear ring, the scope of the offset angle of described runner be 20 °≤| α |≤90 °, described drill body is provided with and comprises the fixedly stationary cutting structure of cutting teeth.
In the said structure, the deviation angle of described runner
Wherein s is the wheelbase that moves of runner, and c is the stand-off of runner.As Fig. 3, Fig. 4, shown in Figure 5, AB is a drill bit central axis, and CD is the runner central axis, is runner pole axis face A through runner axis CD and the face that is parallel to drill axis AB
1, A
2Be through drill axis AB and perpendicular to runner pole axis face A
1The plane, A
3Be to pass through drill axis AB and be parallel to runner pole axis face A
1The plane.The point that characterizes each cutting teeth position coordinates on the runner 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.Runner effluxes the plane A at each cutting teeth anchor point place on the gear ring
4Be the runner reference plane, runner reference plane A
4With the intersection point E of runner axis CD be the runner reference point.Cross some E and make vertical line to drill axis AB, intersection point is F.Runner stand-off c is runner reference point E to plane A
2Distance; Runner moves wheelbase s and is drill axis AB and runner pole axis face A
1Between distance, and the regulation, along drill axis from runner to bit body, pole axis face A
1At plane A
3Be the axle of shuffling during the left side, otherwise, then be the negative axle that moves; The offset angle of runner is straight line EF and plane A
3Between angle, deviation angle is promptly arranged
Shuffle a hour offset angle α for just, bear and move a hour offset angle α for negative; The axial rake β of runner is runner 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, runner promptly can rotate around the axle journal of the wheel palm rotating and outside axis is done axial feed motion, also can rotate motion with respect to drill body around drill axis with drill body.If the deviation angle of runner equals zero, the axis of runner and drill axis intersect, runner 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 runner rolling track radius of circle.At this moment, runner will be being that instantaneous center of rotation relatively rotates with cutting teeth that bottom rock acts on mutually, do not have relative slippage between cutting teeth and the rock.If the deviation angle of runner is not equal to zero, then the axis of runner and drill axis are no longer crossing, but the space is staggered, and the pure rolling condition of runner is no longer satisfied.At this moment, runner 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 runner 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 runner on bottom rock comprised two parts: the first, and radial slippage.The process of cutting teeth on the runner 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 determined, 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 runner 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 runner, cutting teeth is the similar helix shape of when negative (deviation angle for) along (deviation angle is timing) 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.
Runner move that wheelbase s increases or stand-off c reduces, all cause the runner offset angle to increase, the former capital can increase radial slippage and the circumferentially slippage of cutting teeth in the shaft bottom, promptly increases the total slippage of cutting teeth in the shaft bottom.
The deviation angle of above-mentioned runner
Thereby 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 runner diameter remained unchanged, what increase runner moved wheelbase s, and the stand-off c of runner will correspondingly reduce.
In the utility model, the broken rock mode that has adopted stationary cutting structure to combine with runner: runner 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 runner is scraped on bottom rock and cut out from outside to inside or spirality Cutting trajectory from inside to outside.The acting in conjunction effect of two cover Cutting trajectories 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.
For 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, and the rate of wear of general bit exterior zone (particularly outer 1/3 zone of drill bit radius) cutting teeth is obviously faster than the tooth in heart portion zone.Cutting teeth on the runner 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 runner 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 runner, slows down its rate of wear.So combined drill of the present 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 runner 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.
For 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 runner, increased cutting teeth quantity, and the cutting teeth on the runner can take turns to operate.Because what participate in rock cutting on the runner 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 runner 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 substantially.Its effect is when keeping the drill bit rate of penetration working life of drill bit to be prolonged.Like this, the contradiction that prolongs in drill bit design between bit life and the raising drilling speed can significantly be alleviated.
Because the cutting teeth on the runner is with cutting way (cut mode) fractured rock, the required axial weight on bit of runner 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.
Thinking of the present utility model is: increase the runner offset angle by the mode of moving wheelbase s, reducing the stand-off c of runner that increases runner, and make its 20 °≤| α | in≤90 ° of scopes, reach the cutting teeth that increases on the runner 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 runner is with the rock of speed incision slowly, and under the drive of bit body relatively bottom rock scrape and slowly cut out again after cutting one section long distance, thereby realize that the cutting teeth on the runner 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 netted broken 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 utility model combines runner with stationary cutting structure, formed two cover Cutting trajectories on bottom rock, its effect is to form netted broken zone in the shaft bottom, helps the effective wedging of cutting teeth to rock, help the fragmentation of rock, can significantly improve the efficiency of breaking rock of drill bit.
(2) the cutting teeth alternation on the runner 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 runner, 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 runner, good cooling results is difficult for taking place thermal wear.
(5) can utilize diamond composite component such as PDC composite sheet as cutting teeth with the combined drill of the broken rock of cutting way, the working life of tooth and stock-removing efficiency all are better than single-cone rotary drill bit.
The pressure of the drill required when (6) creeping into the combined drill of the broken rock of cutting way 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, be longer than the tricone bit of equal conditions with the bearing working life-span of the wheel-type drill of the broken rock of cutting way.
Described runner is provided with inboard cutting gear ring.
Inboard cutting gear ring is meant and is arranged on the runner, effluxes the cutting gear ring more by the cutting gear ring of lining, and its quantity can be 1 to a plurality of.
The described cutting teeth that effluxes in cutting gear ring, inboard cutting gear ring and the stationary cutting structure is composite polycrystal-diamond, TSP cutting teeth, natural diamond cutting teeth, impregnated with diamond cutting teeth, carbide cutting tooth, cubic boron nitride cutting teeth, ceramic cutting teeth, comprise the cutting teeth of diamond or cubic boron nitride.
Has the runner cutting unit that the 1-6 group is made of the described runner and the wheel palm on the described drill body; Have on the described drill body 1-6 group fixed the stationary cutting structure of described fixedly cutting teeth.
Described runner cutting unit and described stationary cutting structure (8) are 2 groups and alternate layout.
Described runner cutting unit and described stationary cutting structure (8) are 3 groups.
The scope of the offset angle of described runner be 30 °≤| α |＜90 °.
The scope of the offset angle of described runner be 40 °≤| α |≤85 °.
The described cutting teeth that effluxes in cutting gear ring, inboard cutting gear ring and the stationary cutting structure is a composite polycrystal-diamond.
The offset angle of described runner is 60 °.
Beneficial effect: the cutting teeth in the utility model on the runner is alternately to scrape the broken rock of the form of cutting, and the cutting teeth on the cooperation stationary cutting structure, on bottom rock, form netted broken zone, the efficiency of breaking rock height, wearing and tearing are even, good cooling results, and the life-span of tooth is long, bearing working life-span height, drilling life of bit is long.
Description of drawings
The utility model will illustrate by example and with reference to the mode of accompanying drawing, wherein:
Fig. 1 is a structural representation of the present utility model, and its runner cutting unit and stationary cutting structure are 2 groups, both alternate layouts.Among the figure: 1, drill body, 2, runner, 3, the wheel palm, 4, efflux the cutting gear ring, 7, nozzle, 8, stationary cutting structure, 8a, fixing cutting teeth;
Fig. 2 is the vertical view of Fig. 1;
Fig. 3 moves the schematic diagram of wheelbase s, stand-off c, offset angle and axial rake β for runner of the present utility model geometric position parameter;
Fig. 4 is the sectional view of the runner of one group of cutting unit of the present utility model along runner pole axis face.Among the figure: 6, axle journal;
Fig. 5 is the utility model relative geometry position of runner on drill bit and schematic diagram of parameter s, c, α when drill axis is overlooked;
Fig. 6 is 3 groups for the utility model runner cutting unit and stationary cutting structure, the structural representation of 3 groups of alternate layouts of cutting unit;
Fig. 7 is the vertical view of Fig. 6;
Fig. 8 is a stationary cutting structure for the utility model bit central, and the periphery is the structural representation of runner cutting unit.Among the figure: 5, inboard cutting gear ring;
Fig. 9 is the vertical view of Fig. 8;
Structural representation when Figure 10 is negative value for the offset angle of runner of the present utility model;
Figure 11 is the vertical view of Figure 10;
When Figure 12 was offset angle=20 ° of runner of the present utility model, under runner cutting unit and stationary cutting structure acting in conjunction, drill bit was scraped the netted scratch schematic diagram that cuts out in the shaft bottom.Among the figure: 9, the fixedly cutting teeth on the stationary cutting structure is scraped the concentric circles scratch that cuts out, and 10, the cutting teeth on the runner cutting unit scrapes cut out tired like spiral yarn shaped scratch;
When Figure 13 was offset angle=30 ° of runner of the present utility model, under runner cutting unit and stationary cutting structure acting in conjunction, drill bit was scraped the netted scratch schematic diagram that cuts out in the shaft bottom;
When Figure 14 was offset angle=40 ° of runner of the present utility model, under runner cutting unit and stationary cutting structure acting in conjunction, drill bit was scraped the netted scratch schematic diagram that cuts out in the shaft bottom;
When Figure 15 was offset angle=50 ° of runner of the present utility model, under runner cutting unit and stationary cutting structure acting in conjunction, drill bit was scraped the netted scratch schematic diagram that cuts out in the shaft bottom;
When Figure 16 was offset angle=60 ° of runner of the present utility model, under runner cutting unit and stationary cutting structure acting in conjunction, drill bit was scraped the netted scratch schematic diagram that cuts out in the shaft bottom;
When Figure 17 was offset angle=70 ° of runner of the present utility model, under runner cutting unit and stationary cutting structure acting in conjunction, drill bit was scraped the netted scratch schematic diagram that cuts out in the shaft bottom;
When Figure 18 was offset angle=80 ° of runner of the present utility model, under runner cutting unit and stationary cutting structure acting in conjunction, drill bit was scraped the netted scratch schematic diagram that cuts out in the shaft bottom;
Figure 19 is offset angle=85 ° of runner of the present utility model or during near 90 °, under runner cutting unit and stationary cutting structure acting in conjunction, drill bit is scraped the netted scratch schematic diagram that cuts out in the shaft bottom;
When Figure 20 was offset angle=-60 ° of runner of the present utility model, under runner cutting unit and stationary cutting structure acting in conjunction, drill bit was scraped the netted scratch schematic diagram that cuts out in the shaft bottom;
The tooth hole schematic diagram that Figure 21 produces on bottom rock for common tricone bit; Among the figure: 11, tooth hole.
The specific embodiment
Shown in Fig. 1,2,3,4,5,6,7,8,9,10,11: a kind of combined drill with the broken rock of cutting way, comprise drill body 1, runner 2, has the wheel palm 3 on the described drill body 1, described runner 2 is installed in described the wheel on the palm 3 the axle journal 6, be rotationally connected with 3 formation of the wheel palm, on described runner 2, be furnished with and efflux cutting gear ring 4, it is characterized in that: the scope of the offset angle of described runner 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.
Embodiment 1:
When offset angle=± 20 of runner 2 °, be example (to be bit gauge footpath point to the drill axis solstics on the runner) with the drill bit of external diameter D=8.5 inch (215.9mm).Getting the radius r that runner 2 effluxes cutting gear ring 4 is 65mm, axial rake β=0 of runner 2 °, because
s＝c·tan|α| (1)
Can get by formula (1) and (2), stand-off c=62.75mm, runner 2 move wheelbase s=22.84mm.
Under above-mentioned parameter, runner 2 effluxes the cutting teeth of cutting on the gear ring 4 from be cut into the process that cuts out bottom rock, and its radial slippage amount is 41.17mm.The actual experiment that calculates and done through theory all can draw the wheel body speed ratio of this moment below 0.96, runner 2 rotations are slow during the drill bit rotary drilling, can realize that the cutting teeth on the runner 2 is pressed into rock with speed slowly, and under the drive of bit body relatively bottom rock scrape and slowly cut out again after cutting one section long distance.As shown in figure 12, during for offset angle=20 of runner 2 of the present utility model °, under runner cutting unit and stationary cutting structure acting in conjunction, drill bit is scraped the netted scratch schematic diagram that cuts out in the shaft bottom, cutting teeth on the figure transfer wheel cutting unit is scraped the similar spiral yarn shaped scratch 10 that cuts out from outside to inside, and the fixedly cutting teeth on the stationary cutting structure is scraped and cut out circular concentric scratch 9.As can be seen from Figure, the runner cutting teeth is longer in the slippage (scraping the amount of cutting) in shaft bottom, has obviously embodied the cutting teeth on the runner by turns alternately and to scrape the characteristics of the broken rock of cutting of form.
Constant at above-mentioned D and r value, and when guaranteeing α 〉=20 °, if increase axial rake β, this moment, stand-off c reduced, and moved wheelbase s and increased.Though can reduce the radial slippage amount of cutting teeth like this in the shaft bottom, can obviously reduce the wheel body speed ratio simultaneously, increase the circumferential slippage of cutting teeth, the circumferential slippage increase of cutting teeth is bigger than its radial slippage decrease.That is, during other parameter constant, the increase of axial rake β will make cutting teeth further extend in the slippage (scraping the amount of cutting) in shaft bottom.Therefore, getting β=0 in the aforementioned calculation process ° is to realize the situation of cutting teeth in the slippage minimum in shaft bottom under the above-mentioned parameter.
Below implement in the computational process, all get β=0 °.
Embodiment 2:
When offset angle=± 30 of runner 2 °, still the drill bit with external diameter D=215.9mm is an example.Get runner efflux the cutting gear ring 4 radius r be 65mm.
Still can get by formula (1) and (2), stand-off c=51.62mm, runner 2 move wheelbase s=29.81mm.
Under above-mentioned parameter, cutting teeth radial slippage amount is 48.34mm.The wheel body speed ratio that the actual experiment that calculates and done through theory all can draw this moment is below 0.79, can realize that cutting teeth on the runner 2 is scraped in the shaft bottom in turn with the forms of motion that slowly replaces to cut or cut brokenly rock.As shown in figure 13, during for offset angle=30 of runner 2 of the present utility model °, under runner cutting unit and stationary cutting structure acting in conjunction, drill bit is scraped the netted scratch schematic diagram that cuts out in the shaft bottom.As can be seen from Figure, the runner cutting teeth will be grown during than α=± 20 ° many in the slippage (scraping the amount of cutting) in shaft bottom, embodied the cutting teeth on the runner to scrape the characteristics of the broken rock of the form of cutting.
Embodiment 3:
When offset angle=± 40 of runner 2 °, D, r value are the same, and substitution formula (1) and (2) can get, c=41.37mm, s=34.71mm.
Under above-mentioned parameter, cutting teeth radial slippage amount is 53.95mm, and the wheel body speed ratio is below 0.64.As shown in figure 14, during for offset angle=40 of runner 2 of the present utility model °, under runner cutting unit and stationary cutting structure acting in conjunction, drill bit is scraped the netted scratch schematic diagram that cuts out in the shaft bottom.As can be seen from Figure, the cutting teeth on the runner will be grown during than α=± 30 ° in the slippage in shaft bottom.
Embodiment 4:
When offset angle=± 50 of runner 2 °, D, r value are the same, can get c=31.97mm, s=38.11mm.
At this moment, cutting teeth radial slippage amount is 58.21mm, and the wheel body speed ratio is below 0.49.As shown in figure 15, during for offset angle=50 of runner 2 of the present utility model °, under runner cutting unit and stationary cutting structure acting in conjunction, drill bit is scraped the netted scratch schematic diagram that cuts out in the shaft bottom.As can be seen from Figure, the cutting teeth on the runner further extends during than α=± 40 ° in the slippage in shaft bottom.
Embodiment 5:
When offset angle=± 60 of runner 2 °, D, r value are the same, can get c=23.32mm, s=40.40mm.
At this moment, cutting teeth radial slippage amount is 61.30mm, and the wheel body speed ratio is below 0.36.As Figure 16 and shown in Figure 20, when being respectively offset angle=60 ° of runner 2 of the present utility model and α=-60 °, under runner cutting unit and stationary cutting structure acting in conjunction, drill bit is scraped the netted scratch schematic diagram that cuts out in the shaft bottom.As can be seen from Figure, the cutting teeth on the runner will be grown during than α=± 50 ° in the slippage (scraping the amount of cutting) in shaft bottom.
Embodiment 6:
When offset angle=± 70 of runner 2 °, D, r value are the same, can get c=15.24mm, s=41.87mm.
At this moment, cutting teeth radial slippage amount is 63.39mm, and the wheel body speed ratio is below 0.23.As shown in figure 17, during for offset angle=70 of runner 2 of the present utility model °, under runner cutting unit and stationary cutting structure acting in conjunction, drill bit is scraped the netted scratch schematic diagram that cuts out in the shaft bottom.As can be seen from Figure, the cutting teeth on the runner will be grown during than α=± 60 ° in the slippage (scraping the amount of cutting) in shaft bottom.
Embodiment 7:
When offset angle=± 80 of runner 2 °, D, r value are the same, can get c=7.53mm, s=42.69mm.
At this moment, cutting teeth radial slippage amount is 64.60mm, and the wheel body speed ratio is about 0.12.As shown in figure 18, during for offset angle=80 of runner 2 of the present utility model °, under runner cutting unit and stationary cutting structure acting in conjunction, drill bit is scraped the netted scratch schematic diagram that cuts out in the shaft bottom.As can be seen from Figure, the cutting teeth on the runner will be grown during than α=± 70 ° in the slippage (scraping the amount of cutting) in shaft bottom.
Embodiment 8:
Deviation angle when runner 2 | α | equal 85 ° or during near 90 °, this moment, the stand-off c of runner 2 was very little, and runner 2 to move wheelbase s much bigger than stand-off c.Therefore, the wheel body speed ratio will be littler, and the runner rotational velocity will be slower when drill bit creeps into.Cutting teeth can be longer in the slippage (scraping the amount of cutting) in shaft bottom, and cutting teeth will be more obvious with the feature of scraping the broken rock of cutting of form.As shown in figure 19, equal 85 ° or during near 90 °, under runner cutting unit and stationary cutting structure acting in conjunction, drill bit is scraped the netted scratch schematic diagram that cuts out in the shaft bottom for offset angle when runner 2.
Comprehensive comparative analysis the various embodiments described above, as can be known, when the offset angle of runner 2 increased, the wheel body speed ratio reduced, and cutting teeth will be once big in the slippage (scraping the amount of cutting) in shaft bottom.The offset angle of runner 2 is big more, and it is obvious more that cutting teeth is cut effect scraping of shaft bottom.The scope of the offset angle of runner 2 20 °≤| α | in the time of≤90 °, can realize all that the cutting teeth on the runner 2 was scraped in turn with the form that slowly replaces when drill bit crept into to cut brokenly rock.Runner cutting unit and stationary cutting structure cooperate the effect that all can realize netted scratch.
Described runner 2 is provided with inboard cutting gear ring 5.
The described cutting teeth that effluxes in cutting gear ring 4, inboard cutting gear ring 5 and the stationary cutting structure 8 is composite polycrystal-diamond, TSP cutting teeth, natural diamond cutting teeth, impregnated with diamond cutting teeth, carbide cutting tooth, cubic boron nitride cutting teeth, ceramic cutting teeth, comprise the cutting teeth of diamond or cubic boron nitride.
Has the 1-6 group on the described drill body 1 by described runner 2 and the wheel palm 3 runner cutting units that constituted; Have on the described drill body 1 1-6 group fixed the stationary cutting structure 8 of described fixedly cutting teeth 8a.
Described runner cutting unit and described stationary cutting structure 8 are 2 groups and alternate layout.
Described runner cutting unit and described stationary cutting structure 8 are 3 groups.
The scope of the offset angle of described runner 2 be 30 °≤| α |＜90 °.
The scope of the offset angle of described runner 2 be 40 °≤| α |≤85 °.
The described cutting teeth that effluxes in cutting gear ring 4, inboard cutting gear ring 5 and the stationary cutting structure 8 is a composite polycrystal-diamond.
The offset angle of described runner 2 is 60 °.
Claims (10)
1. combined drill with the broken rock of cutting way, comprise drill body (1), runner (2), has the wheel palm (3) on the described drill body (1), described runner (2) is installed on the described axle journal (6) of taking turns the palm (3), be rotationally connected with the wheel palm (3) formation, on described runner (2), be furnished with and efflux cutting gear ring (4), it is characterized in that: the scope of the offset angle of described runner (2) be 20 °≤| α |≤90 °, described drill body (1) is provided with and comprises the fixedly stationary cutting structure (8) of cutting teeth (8a).
2. a kind of combined drill with the broken rock of cutting way according to claim 2 is characterized in that: described runner (2) is provided with inboard cutting gear ring (5).
3. a kind of combined drill with the broken rock of cutting way according to claim 1 and 2 is characterized in that: the described cutting teeth that effluxes in cutting gear ring (4), inboard cutting gear ring (5) and the stationary cutting structure (8) is composite polycrystal-diamond, TSP cutting teeth, natural diamond cutting teeth, impregnated with diamond cutting teeth, carbide cutting tooth, cubic boron nitride cutting teeth, ceramic cutting teeth, comprise the cutting teeth of diamond or cubic boron nitride.
4. a kind of combined drill with the broken rock of cutting way according to claim 1 is characterized in that: have the runner cutting unit that the 1-6 group is made of the described runner (2) and the wheel palm (3) on the described drill body (1); Have on the described drill body (1) 1-6 group fixed the stationary cutting structure (8) of described fixedly cutting teeth (8a).
5. a kind of combined drill with the broken rock of cutting way according to claim 4, it is characterized in that: described runner cutting unit and described stationary cutting structure (8) are 2 groups and alternate layout.
6. a kind of combined drill with the broken rock of cutting way according to claim 4, it is characterized in that: described runner cutting unit and described stationary cutting structure (8) are 3 groups.
7. a kind of combined drill with the broken rock of cutting way according to claim 1 is characterized in that: the scope of the offset angle of described runner (2) be 30 °≤| α |＜90 °.
8. a kind of combined drill with the broken rock of cutting way according to claim 7 is characterized in that: the scope of the offset angle of described runner (2) be 40 °≤| α |≤85 °.
9. a kind of combined drill with the broken rock of cutting way according to claim 3 is characterized in that: the described cutting teeth that effluxes in cutting gear ring (4), inboard cutting gear ring (5) and the stationary cutting structure (8) is a composite polycrystal-diamond.
10. a kind of combined drill with the broken rock of cutting way according to claim 8, it is characterized in that: the offset angle of described runner (2) is 60 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202619418U CN201751525U (en) | 2010-07-16 | 2010-07-16 | Combined type drill bit for breaking rock by cutting manner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202619418U CN201751525U (en) | 2010-07-16 | 2010-07-16 | Combined type drill bit for breaking rock by cutting manner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201751525U true CN201751525U (en) | 2011-02-23 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202619418U Expired - Lifetime CN201751525U (en) | 2010-07-16 | 2010-07-16 | Combined type drill bit for breaking rock by cutting manner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201751525U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101892810A (en) * | 2010-07-16 | 2010-11-24 | 西南石油大学 | Combined drill breaking rocks by cutting method |
| WO2012006968A1 (en) * | 2010-07-16 | 2012-01-19 | 西南石油大学 | Rotary drill bit |
| CN103147692A (en) * | 2013-02-28 | 2013-06-12 | 西南石油大学 | Gear-fixed cutting structure composite drill bit |
| CN103890305A (en) * | 2011-03-28 | 2014-06-25 | 戴蒙得创新股份有限公司 | Cutting element having modified surface |
| CN106368614A (en) * | 2016-11-25 | 2017-02-01 | 西南石油大学 | Disc drill bit with steerable wheel discs |
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2010
- 2010-07-16 CN CN2010202619418U patent/CN201751525U/en not_active Expired - Lifetime
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101892810A (en) * | 2010-07-16 | 2010-11-24 | 西南石油大学 | Combined drill breaking rocks by cutting method |
| WO2012006968A1 (en) * | 2010-07-16 | 2012-01-19 | 西南石油大学 | Rotary drill bit |
| WO2012006966A1 (en) * | 2010-07-16 | 2012-01-19 | 西南石油大学 | Composite drill bit |
| CN101892810B (en) * | 2010-07-16 | 2012-07-25 | 西南石油大学 | Combined drill breaking rocks by cutting method |
| US8985243B2 (en) | 2010-07-16 | 2015-03-24 | Southwest Petroleum University | Composite drill bit |
| CN103890305A (en) * | 2011-03-28 | 2014-06-25 | 戴蒙得创新股份有限公司 | Cutting element having modified surface |
| 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 |
| CN106368614A (en) * | 2016-11-25 | 2017-02-01 | 西南石油大学 | Disc drill bit with steerable wheel discs |
| CN106368614B (en) * | 2016-11-25 | 2019-08-23 | 成都海锐能源科技有限公司 | A kind of disc drill bit that wheel disc can turn to |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20110223 Effective date of abandoning: 20120725 |