CN107476766A - Cutting element recess with release characteristic - Google Patents
Cutting element recess with release characteristic Download PDFInfo
- Publication number
- CN107476766A CN107476766A CN201710229883.7A CN201710229883A CN107476766A CN 107476766 A CN107476766 A CN 107476766A CN 201710229883 A CN201710229883 A CN 201710229883A CN 107476766 A CN107476766 A CN 107476766A
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- China
- Prior art keywords
- recess
- blade
- drill bit
- release
- opening
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- 238000005520 cutting process Methods 0.000 title claims abstract description 180
- 239000000463 material Substances 0.000 claims description 52
- 238000005219 brazing Methods 0.000 claims description 23
- 238000005476 soldering Methods 0.000 claims description 21
- 238000005452 bending Methods 0.000 claims description 7
- 230000006835 compression Effects 0.000 claims 1
- 238000007906 compression Methods 0.000 claims 1
- 238000005553 drilling Methods 0.000 description 20
- 238000009434 installation Methods 0.000 description 15
- 230000008859 change Effects 0.000 description 13
- 238000007599 discharging Methods 0.000 description 13
- 238000000034 method Methods 0.000 description 12
- 230000006870 function Effects 0.000 description 10
- 238000001816 cooling Methods 0.000 description 9
- 238000010438 heat treatment Methods 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 9
- 239000012530 fluid Substances 0.000 description 8
- 238000003801 milling Methods 0.000 description 8
- 230000015572 biosynthetic process Effects 0.000 description 7
- 238000005755 formation reaction Methods 0.000 description 7
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 description 7
- 239000000853 adhesive Substances 0.000 description 5
- 230000001070 adhesive effect Effects 0.000 description 5
- 239000012141 concentrate Substances 0.000 description 4
- 229910003460 diamond Inorganic materials 0.000 description 4
- 239000010432 diamond Substances 0.000 description 4
- 238000003754 machining Methods 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 239000004576 sand Substances 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 3
- 235000013351 cheese Nutrition 0.000 description 3
- 230000008602 contraction Effects 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 229910052582 BN Inorganic materials 0.000 description 2
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 2
- 208000037656 Respiratory Sounds Diseases 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000007731 hot pressing Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 238000010146 3D printing Methods 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000012217 deletion Methods 0.000 description 1
- 230000037430 deletion Effects 0.000 description 1
- 238000004512 die casting Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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- 238000007528 sand casting Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/46—Drill bits characterised by wear resisting parts, e.g. diamond inserts
- E21B10/54—Drill bits characterised by wear resisting parts, e.g. diamond inserts the bit being of the rotary drag type, e.g. fork-type bits
- E21B10/55—Drill bits characterised by wear resisting parts, e.g. diamond inserts the bit being of the rotary drag type, e.g. fork-type bits with preformed cutting elements
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/08—Roller bits
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/26—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/42—Rotary drag type drill bits with teeth, blades or like cutting elements, e.g. fork-type bits, fish tail bits
- E21B10/43—Rotary drag type drill bits with teeth, blades or like cutting elements, e.g. fork-type bits, fish tail bits characterised by the arrangement of teeth or other cutting elements
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/46—Drill bits characterised by wear resisting parts, e.g. diamond inserts
- E21B10/56—Button-type inserts
- E21B10/567—Button-type inserts with preformed cutting elements mounted on a distinct support, e.g. polycrystalline inserts
Landscapes
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Earth Drilling (AREA)
- Drilling Tools (AREA)
Abstract
The invention discloses the cutting element recess with release characteristic.The present invention provides a kind of drill bit, and the drill bit has drill main body.Recess is formed in the surface of the drill main body.The recess has opening at the surface and limited by rear wall and side wall, and the side wall extends between wall and the surface in the rear.The recess is included in the stress release feature at the front end of the side wall, and the stress release feature is used for reducing the stress concentration in the drill main body at the recess or near it；In the stress release feature of the rear end of the side wall, the stress release feature is used for reducing the stress concentration in the drill main body at the recess or near it；Or the stress release feature at both the front-end and back-end of side wall places.
Description
The cross reference of related application
This application claims in " Cutting Element Pocket with submitting and entitled on April 8th, 2016
Front Relief Groove " U.S. Patent Application No. 62/320,045 and the submit and title on April 8th, 2016
For " rights and interests of Cutting Element with Base Relief Groove " U.S. Patent Application No. 62/320,076 and
Priority.Each in aforementioned application is incorporated herein in its entirety by reference.
Background of invention
For various explorations or exploitation purpose, pit shaft can be drilled in ground location or sea bed.For example, well can be drilled
Cylinder approaches the fluid being stored in subsurface formations, such as liquid and gaseous hydrocarbon and from formation production fluid.For produce or
The pit shaft of production fluid can be lined with sleeve around well bore wall.Can be partly according to the feature on the stratum for drilling pit shaft wherein
To utilize various boring methods and instrument.
In the establishment of pit shaft, maintenance, extending and scrapping, well system can use various drill bits.Drill bit includes probing
Drill bit, milling cutter, reamer, hole making drill and other cutting elements.Some drill bits use the cutting member held by the main body of drill bit
Part.Cutting element can include material harder than the main body of drill bit or more resistant.Cutting element passes through friction, soldering, welding
Or machanical fastener and be fastened in the recess in main body.
During the operation of well system, drill bit can be subjected to caused power and vibration in whole main body and cutting element.It is main
Power and vibration on both body and cutting element can make the cutting element in recess occur loosening, at damage recess or near it
Main body, soldering between cutting element and main body or other materials in damage recess, or otherwise harm is cut
Cut the integrality of element retaining in drill bit or drill bit itself.
The content of the invention
In some embodiments, drill bit includes drill main body and cutting face, and the cutting face forms the one of drill main body
Part is otherwise attached to the drill main body.Cutting face includes the surface with recess.Recess completely or partially by
Rear wall and side wall limit.The recess includes release opening in the interface on recess and surface, and on the periphery of recess extremely
Few 75% surrounding extension.
According to some embodiments, drill bit includes drill main body and the blade from drill main body extension.Blade has wherein
The surface towards stratum with top recess.Blade is positioned in the recess of top.Top recess is at least partly by rear wall and side
Wall limits, and including release opening, the release opening at least partially in the periphery of top recess around, towards stratum
Interface extension between surface and side wall.
In a further embodiment, manufacturing the method for drill bit includes forming the drill main body with cutting face, described to cut
Bevel has the surface towards stratum.Top recess is in towards in the surface and cutting face on stratum, and by rear wall and side wall
Limit.Blade is placed into the recess of top and is soldered to appropriate position.The temperature of drill main body and blade is reduced,
This can make cutting face with the speed thermal contraction more than blade.The stress concentration in cutting face is reduced with stress release opening, it is described
Stress release opening is in around the periphery of top recess, and is located at towards the interface between the surface on stratum and side wall.
In some embodiments, drill bit includes drill main body and the blade from drill main body extension.Blade has at least
The recess that part is limited by rear wall and side wall.One or more recesses include belt stress releasing member in side wall or rear wall.
Blade is soldered in the recess with belt stress releasing member.
Additional embodiment includes drill bit, and the drill bit has a drill main body, and the drill main body has surface and described
Recess in surface.Recess is at least partly limited by side wall and rear wall, and has recess depth and recess width.Drill main body
It is additionally included in the release recess of the interface of rear wall and side wall.Release recess has recess depths and recess width.Drill main body
Also include release opening in the interface on side wall and surface.Release opening at least partially in extending around the periphery of recess, and
Extended laterally with opening depth and opening.
In some embodiments, drill bit includes drill main body and the blade from drill main body extension.Blade includes having
The surface of recess.Recess is limited by side wall and rear wall, and is discharged recess and formed between side wall and rear wall.Release recess has
Extend beyond the depth of the recess depth of recess.
In some embodiments, drill bit includes drill main body, blade and cutting element from drill main body extension.Cutting
Element is positioned in the blade surface recess in blade.Blade surface recess is in the forward surface of blade, and is limited by side wall and rear wall
It is fixed.Recess includes release recess between rear wall and side wall.Release recess is positioned between rear wall and side wall, and discharges recess
Depth with the recess depth for extending beyond blade surface recess.
In a further embodiment, manufacturing the method for drill bit includes forming drill main body, and wherein blade is from the drill bit
Main body extends.Blade includes the forward surface wherein with blade surface recess.Cutting element is placed in blade surface recess and incited somebody to action
Its soldering is wherein.The temperature of blade and cutting element is reduced, this can make blade with the speed thermal contraction more than cutting element.Make
The stress concentration in blade is reduced with the stress release recess at the bottom of blade surface recess.
Present invention is provided for introducing some concepts further described in embodiment, and neither purport
In the key or essential feature of the claimed theme of mark, the model for helping to limit claimed theme is not intended to
Enclose.The supplementary features and aspect of the embodiment of the disclosure will be illustrated in describing below.These and other characteristic roots are retouched down according to this
Stating will become more thoroughly clear with appended claims, or can be by putting into practice this kind of embodiment party as described herein
Case understands.
Brief description
In order to describe to obtain the mode of the above and other feature of the disclosure, by the spy by reference to being shown in accompanying drawing
Determine embodiment more specifically to describe to present.In order to more fully understand, through each accompanying drawing, similar components are with similar reference
Number represent.Although some figures are probably the schematic of concept or exaggerate expression, at least some figures are probably to paint in proportion
System.It should be understood that each figure shows some example embodiments, reconciliation more clearly and will be more fully described by using accompanying drawing
The embodiment is released, in the accompanying drawings：
Fig. 1 is the side, sectional view according to the embodiment of the well system of the disclosure；
Fig. 2 is the perspective view according to the embodiment of the drill bit with multiple cutting elements of the disclosure；
Fig. 3-1 is the fragmentary sectional side view according to the embodiment of the blade of the disclosure；
Fig. 3-2 is the detail drawing according to the embodiment of Fig. 3-1 of disclosure top recess；
Fig. 4 is the detail drawing of the embodiment of the stress release opening in the top recess according to the disclosure；
Fig. 5 is the detail drawing of another embodiment of the stress release opening in the top recess according to the disclosure；
Fig. 6 is the detail drawing of another embodiment again of the stress release opening in the top recess according to the disclosure；
Fig. 7 is the another embodiment of the stress release opening and stress release recess in the top recess according to the disclosure
Detail drawing；
Fig. 8 is the side cross-sectional view according to the embodiment of the blade with top recess and blade surface recess of the disclosure；
Fig. 9-1 is the fragmentary sectional side view according to the embodiment of the blade of the disclosure；
Fig. 9-2 is the detail drawing according to the embodiment of Fig. 3-1 of disclosure blade surface recess；
Figure 10-1 is the detail drawing of the embodiment of the stress release recess in the blade surface recess according to the disclosure；
Figure 10-2 is the end-view according to the embodiment of Fig. 4-1 of disclosure stress release recess；
Figure 11-1 is the detail drawing of another embodiment of the stress release recess in the blade surface recess according to the disclosure；
Figure 11-2 is the end-view according to the embodiment of Fig. 5-1 of disclosure stress release recess；
Figure 12-1 is the detail drawing of another embodiment again of the stress release recess in the blade surface recess according to the disclosure；
Figure 12-2 is the end-view according to the embodiment of Fig. 6-1 of disclosure stress release recess；And
Figure 13 is the side cross-sectional view according to the embodiment of the blade with top recess and blade surface recess of the disclosure.
Embodiment
The disclosure relates generally to device, system and the side being positioned at one or more cutting elements in drill main body
Method.More specifically, this disclosure relates to which the embodiment of the drill bit with cutting element recess, the cutting element recess have
One or more stress release parts, one or more of stress release parts can increase operation lifetime, improve cutting member
The possibility of bonding strength, reduction cutting element or drill main body failure between part and drill main body, or its combination.Although this
Text describes the drill bit for being cut in earth formation, however, it is understood that the disclosure goes for other drill bits, it is all
Such as other drill bits used in milling cutter, reamer, hole making drill and underground or other application.
Fig. 1 shows to form an example of the well system 100 of pit shaft 102 for drilling earth formation 101.Drilling well system
System 100 includes being used for the rig 103 for rotating drilling tool component 104, and the drilling tool component 104 extends downwardly into pit shaft
In 102.Drilling tool component 104 can include drill string 105, be attached to drill string 105 downhole end part bottom hole assembly
(“BHA”)106.BHA 106 can include being used for probing, milling, reaming or the drill bit for performing other cutting operations in pit shaft
110。
Drill string 105 can include the straight-through tool-joint 109 of several joints, i.e. end-to-end link of drilling rod 108.Drill string
Drilling fluid is conveyed through centre bore and rotary power optionally is sent into BHA 106 from rig 103 by 105.In some realities
Apply in scheme, drill string 105 can also include additional component, pipe nipple, short drill pipe etc..Drill string 105 can include macaroni, connect
Drilling fluid is conveyed through centre bore by continuous oil pipe, possibly can not transmit the other materials of rotary power.Using rotary power
When, down-hole motor (for example, positive displacement motor, turbine drives motor, electric notor etc.) can be included in BHA.Drill string 105
There is provided and drilling fluid is transported into hydraulic path therein from ground face-pumping.The purpose of cutting structure for cooling drill bit 110 and thereon,
Drilling fluid passes through other in the nozzle, spout or drill bit 110 (or miscellaneous part of BHA 106 drill string 105) of selected size
Aperture is discharged, so as to which chip transported into pit shaft 102 when performing downhole operations, or for other purposes (for example, cleaning,
Power etc. is provided for motor).
BHA 106 can include drill bit 110 or miscellaneous part.Example BHA 106 can include additional or miscellaneous part (example
Such as, it is connected between drill string 105 and drill bit 110).The example of additional BHA component includes jumping through rings, stabilizer, measurement while drilling
(" MWD ") instrument, well logging (" LWD ") instrument, down-hole motor, under-reamer, section mill, hydraulic pressure disconnect device, shake
Hit device, vibration or tamping tool, miscellaneous part or combinations thereof.
In general, well system 100 can include other drilling components and annex, such as special service valve is (for example, kelly bar
Plug valve, preventer and safety valve).Drilling tool component can be deemed to be by being included in the additional component in well system 100
A part for 104 part, drill string 105 or BHA 106, this depends on position of the additional component in well system 100
Put or function.
Drill bit 110 in BHA 106 can be suitable for crushing any kind of drill bit of underground material.For example, drill bit
110 can be suitable for drilling the drill bit of earth formation 101.For the exemplary types for the drill bit for drilling earth formation
For fixed-cutter or drag bit (referring to Fig. 2), rock bit, impregnated bit or core bit.In other embodiments
In, drill bit 110 can be for removing metal, composite, elastomer or the milling cutter of other underground materials.For example, drill bit 110
The milling window in the sleeve 107 being usually coated at least a portion of pit shaft 102 can be used together with whipstock (not shown).
Drill bit 110 can also be the section mill of the whole section for milling away sleeve 107, or for milling away instrument, plug
The junk of son, cement or the other materials in pit shaft 102.Chip can be by by using other chips caused by milling cutter
Ground is transported to, or can be allowed to fall on shaft bottom.
With reference to figure 2, show and bored suitable for being drilled through lithostratigraphy to form the example fixed-cutter of pit shaft or scraper
First 210.Drill bit 210 generally includes drill main body 211, shank 212 and for drill bit 210 to be connected into drill string (for example, Fig. 1
Drill string 105) threaded joints or pin 213, drive shaft or be employed to drill pit shaft make that drill bit 210 rotates other
Part.Bit face 214 supports cutting structure 215, and is formed on cutting end part relative with pin 213 in drill bit 210
Or it is attached to the cutting end part.Drill bit 210 also includes central axis 216, drill bit 210 around the central axis 216 by
Rotated in the cutting direction that arrow 217 represents.
Cutting structure 215 is provided in the blade surface 214 of drill bit 210.Cutting structure 215 can include it is multiple angularly between
The main blade 218 and auxiliary-blade 219 separated, each in the blade can extend from bit face 214.Main blade
218 and auxiliary-blade 219 can substantially radially extend along bit face 214 and afterwards along the one of the periphery of drill bit 210
Part axially extends；However, auxiliary-blade 219 is shown as the position court along bit face 214 from off-center axis 216
To drill bit 210 outer periphery extend.Therefore, auxiliary-blade may refer to start simultaneously at a certain distance from away from drill axis
The blade that periphery along bit face towards drill bit substantially radially extends.Main blade 218 and auxiliary-blade 219 are by drilling fluid stream
Dynamic route or chip area 220 circumferentially separate.
Referring still to Fig. 2, each main blade 218 and auxiliary-blade 219 can include the forward surface towards cutting direction 217
221, and on radial outside towards the bottom of pit shaft or end and towards pit shaft sidepiece top or the table towards stratum
Face 222.Multiple cutting elements 225 may be mounted at or be otherwise attached to main blade 218 and auxiliary-blade 219.It is specific and
Speech, each the cutting element 225 with cutting face 226 can be from blade surface or front loading to formation in blade 218,219
In recess.For example, recess can be formed one or two in the surface 222 in forward surface 221 or towards stratum in, and
It can extend approximately along the periphery of main blade 218 and auxiliary-blade 219.Cutting element 225 can neighbouring forward surface 221 and face
To the surface 222 on stratum interface leading edge in the form of radially extending row it is disposed adjacent one another.Each cutting face 226 can have
There is the farthest cutting tip 227 of the part farthest away from the surface 222 towards stratum for being provided with corresponding cutting element 225.
Although cutting face 226 is shown to general plane so that cutting element 225 can serve as shearing cutting element,
In other embodiments, cutting face 226 can have molded non-planar (for example, ridged, cheese, cone, frustoconical,
Bullet shape etc.).
One or more add ons 230 can also be attached to blade 218,219 or drill main body 211.In fig. 2, example
Such as, element 230 could be attached to the surface 222 towards stratum of main blade 218 and auxiliary-blade 219.When drill bit 210 is in cutting side
When being rotated on to 217, element 230 may be at rear or the afterbody of cutting element 225.Element 230 can from top loading to
Formed in the recess or top recess of the masking in blade 218,219.For example, recess can be formed on the surface towards stratum
In 222, and it can be extended radially inwardly in main blade 218 and auxiliary-blade 219, rather than along the surface towards stratum
222 circumferentially extend.In other embodiments, element 230 can be loaded into along the recessed of the extension of surface 222 towards stratum
In nest.
Element 230 can include with similar to above-described cutting face 226 cutting face cutting element, and because
This can be plane or nonplanar.In other embodiments, element 230 can be used for other purposes, and such as limitation is cut
Cut the cutting depth of element 225.In such an implementation, the element can have cheese, bending or other connect
Contacting surface 231.However, in other embodiments, contact surface 231 can have other configurations (for example, plane, ridged, circular cone
Shape, frustoconical, bullet shape etc. configure).Cutting element 225 and element 230 can have relative to the surface 222 towards stratum
There is any suitable expose portion, and any suitable angle (for example, side tool face angle, rear cutting angle etc.) can be oriented in
On.
Fig. 3-1 shows the implementation of the blade 318 (for example, main blade or auxiliary-blade) according to some embodiments of the disclosure
Scheme.Blade 318 can have from top, blade surface or the anterior one or more cutting elements 330 being mounted thereto, wherein cutting
Cutting the cutting face 326 of element 330 and extending from the surface 322 towards stratum of blade 318 (or may be recessed in the table towards stratum
It is in face 322 or substantially flush).However, in other embodiments, cutting element 330 can be substantially neat with forward surface
Flat, depression extends wherein or from it.Shown cutting element 330 (and Fig. 4 blade 430) is shown as including some
(for example, being attached to the diamond table of substrate), but cutting element 330 can include more than two part, or can include
Single part.
Cutting element 330 can be fastened to blade 318 in corresponding top recess 351.In some embodiments, cut
Cutting element 330 can be fastened in the recess 351 of top in the following manner：Frictional fit, engaging, compressed fit, Duo Geji
One of tool fastener (for example, pin, screw, positioning screw, clip, fixture, retaining ring, sleeve pipe etc.), one or more adhesives,
Brazing material, welding or its combination.For example, brazing material 333 can be positioned at around cutting element 330, that is, it is positioned at cutting
Between element 330 and the inwall of top recess 351 for limiting blade 318.
Soldering processes for being soldered to cutting element 330 in the top recess 351 of blade 318 can be included by straight
Connect or indirect heating method (for example, using heating furnace, using blowtorch, applying brazing material 333 at high temperature) comes in top recess
351 surroundings heating blade 318, hot machining element 330, or both has concurrently.To blade 318 and cutting element during soldering
330 heating carried out may cause blade 318 (and top recess 351) and cutting element 330 to expand.
In some embodiments, blade 318 can include material of main part (for example, steel, have pass through metal adhesive knot
Matrix material for the tungsten carbide particle being combined etc.), and cutting element 330 can include one or more cutting materials
(for example, tungsten carbide, polycrystalline diamond, cubic boron nitride etc.).Material of main part, which can have, is different from (for example, being more than) cutting material
The thermal coefficient of expansion of material.Cutting material in cutting element 330, the blade 318 around top recess 351 material of main part and its
Between brazing material 333 cooling period, the size of top recess 351 might have bigger change, or to be different from or
Speed more than the size of cutting element 330 changes.Top recess 351, cutting element 330 and brazing material 333 it is unbalanced
Volume change may result in blade 318 of the stress concentration around top recess 351.
Fig. 3-2 shows the detail drawing of the top recess 351 in Fig. 3-1.Top recess 351 can have side wall 353, the side
Opening in top recess 351 or the front end near it during wall 353 has towards the surface 322 (referring to Fig. 3-1) on stratum
Rear end part 336 in part 335 and top recess 351.Side wall 353 can be in the whole or partial circle of cutting element 330
Surrounding extends.Recess depth 337 can extend to rear end part 336 from the fore-end 335 of side wall 353 in blade 318
Distance.Cutting element 330 can have cutting element length 342.Top recess 351 and cutting element 330 can have respectively
Recess width 354 and cutting element width 339.When cutting element 3515 and brazing material 333 be at least partially positioned at top it is recessed
When in nest 351, recess width 354 can be more than cutting element width 339.The rear surface 340 of cutting element 330 can abut top
The bottom wall 341 of portion's recess 351, but as shown in figure 3-2, brazing material 333 can also be positioned at rear surface 340 and bottom wall 341
Between.Cutting element length 342 can be more than recess depth 337, but in other embodiments, cutting element length 342
Recess depth 337 can be Less than or equal to about.In some embodiments, recess depth 337 can be approximately equal to cutting element length
Degree 342 and along rear surface 340 brazing material 333 thickness combination so that face of the cutting face 326 substantially with blade 318
Flushed to the surface 322 on stratum.
In the cooling procedure after by the soldering of cutting element 330 in top recess 351, material of main part and cutting material
Different thermal coefficient of expansions and therefore expansion/shrinkage factor may produce residual stress near top recess 351.It is remaining
Stress may be in the fore-end 335 of sidewall 34 4, the rear end part 336, attached in other positions or combinations thereof of side wall 353
Near or part is concentrated or is multiplied.Specifically, shunk during cooling around cutting element 330 in top recess 351
When, the fore-end 335 of side wall 353 may concentrate residual stress with the joint intersected towards the surface 322 on stratum.Example
Such as, in some embodiments, recess width 354 may be less than cutting element 330 and pricker under less than 100 ℉ (37.8 DEG C)
The combined width of wlding material 333.In this kind of embodiment, side wall 353 may be concentrated in the convergent force of cutting element 330
At the fore-end 335 of side wall 353.
Referring now to Fig. 4, wherein located with cross section shows the blade 430 of top installation top recess 451 it is another
Individual embodiment.In the illustrative embodiment shown in Fig. 4, blade 430 includes frustoconical blade face surface, but blade
430 can include any suitable surface configuration, such as plane, ridged, cone, cheese, bullet shape, other shapes or
Combinations thereof.The blade surface of blade 430 can be used for cutting stratum, sleeve or other materials, but in other embodiments,
The blade surface of blade 430 may be used as cutting depth limiter, to reduce towards the abrasion on the surface 422 on stratum or for other mesh
's.
In some embodiments, top recess 451 has the release opening 452 for including crooked outline.For example, discharge
Being in mouth 452 parallel to blade 430 or at least a portion of the profile of the plane of the central axis of top recess 451 to be
Circular (that is, having constant radius of curvature) or oval, parabola shaped, hyperbola or its combination (that is, have
The radius of curvature of change).Top recess side wall 453 can limit recess width 454.It is wide that release opening 452 can limit opening
Degree 455.A/F 455 can be the maximum transverse size of release opening 452.A/F 455 and recess width 454 can be with
Aperture efficiency is limited, the aperture efficiency may be at lower limit, the higher limit for including the following in some embodiments
Or in the range of both lower limit and higher limit：1.5:1、1.25:1、1.20:1、1.15:1、1.12:1、1.10:1、1.08:1、
1.06:1、1.04:1、1.02:1、1.01:Any one in 1, or any value therebetween.For example, aperture efficiency can be between
1.25:1 and 1.01:Between 1.In other instances, aperture efficiency can be between 1.20:1 and 1.02:Between 1.In other examples
In, aperture efficiency can be between 1.18:1 and 1.01:Between 1.In some instances, aperture efficiency can be 1.05:1、1.14:1
Or 1.16:1.Still in other embodiments, aperture efficiency can be more than 1.5:1 or less than 1.01:1.
Side wall 453 can limit the recess depth for extending to rear wall 441.Release opening 452 can be extended laterally beyond side
Wall 453 is a certain amount of, is shown as opening and extends laterally 456.Opening extends laterally 456 can at least part and recess width 454
It is related.For example, opening extend laterally 456 and recess width 454 456 can be extended laterally by opening with recess width 454
Be open ratio of elongation and it is related.Opening ratio of elongation can be in lower limit, higher limit or lower limit with the following is included
In the range of higher limit：0.12:1、0.10:1、0.08:1、0.06:1、0.04:1、0.02:1、0.01:Any one in 1,
Or any value therebetween.For example, opening ratio of elongation can be between 0.12:1 and 0.01:Between 1.In other instances, it is open
Ratio of elongation can be between 0.10:1 and 0.02:Between 1.In other instances, the ratio of elongation that is open can be between 0.08:1 with
0.05:Between 1.In some instances, the ratio of elongation that is open can be 0.07:1 or 0.08:1.Still in other embodiments,
The ratio of elongation that is open can be more than 0.12:1 or less than 0.01:1.
Release opening 452 can also include at least partly to the opening opening depth 457 that to extend laterally 456 related.One
In a little embodiments, opening aspect ratio (that is, the depth 457 that is open extends laterally the ratio between 456 with opening) can be in have bag
In the range of lower limit, higher limit or the lower limit and higher limit that include the following：15:1、10:1、8:1、6:1、4:1、2:1、
1:1、1:2、1:4、1:6、1:8、1:10、1:Any one in 15, or any value therebetween.For example, opening aspect ratio can be
Between 10:1 and 1:Between 10.In other instances, opening aspect ratio can be between 8:1 and 1:Between 8.In other examples
In, opening aspect ratio can be between 6:1 and 1:Between 6.In at least one example, opening aspect ratio can be between 9:1
With 4:Between 1.In another example, opening aspect ratio can be about 1:1.In additional examples, opening aspect ratio can be with
More than 15:1 or less than 1:15.
Fig. 5 shows that surrounding has another embodiment again of the top recess 551 of release opening 552.With ellipse
The blade 530 of the top installation of blade surface profile can be positioned in the recess 551 of top.In some embodiments, top recess
551 have the release opening 552 for including at least part linear profile.Top recess side wall 553 can limit recess width 554.
Release opening 552 can limit A/F 555, so as to which limit as described by herein in relation to Fig. 4 a range of opens
Mouth ratio.
Release opening 552 can extend laterally a certain amount of beyond side wall 553, be defined as opening and extend laterally 556.Such as this
Described in text, opening extends laterally 556 can be at least partly related to recess width 554.For example, opening extends laterally 556 and recessed
Nest width 554 can be by the opening ratio of elongation in the scope as described by herein in relation to Fig. 4 and correlation.Release opening 552
Can also include at least partly to the opening opening depth 557 that to extend laterally 556 related, and can with such as herein in relation to
Fig. 4 discuss in the range of opening aspect ratio (that is, depth 557 and the opening of being open extend laterally the ratio between 556).
Fig. 6 shows the another embodiment of the wherein top recess 651 with release opening 652.With conical shaped
The blade 630 of the top installation of profile can be positioned in the recess 651 of top.In some embodiments, top recess 651 has
Having includes the release opening 652 of at least partly linear and at least partly bending profile.For example, release opening 652 can have
Bent portion 658 with curvature, the curvature bend when being moved towards the surface 622 towards stratum and leave top recess
651.In other examples (referring to Fig. 7), release opening can have the bent portion with curvature, and the curvature is a side
Oriented when being moved upwardly toward the surface 622 towards stratum towards top recess 651.In at least some embodiments, release
The a part of of opening 652 can be parallel to the side wall 653 of top recess 651.
Top recess side wall 653 can limit recess width 654.Release opening 652 can limit A/F 655 and open
Mouth extends laterally 656.A/F 655 can by aperture efficiency and related to recess width 654, and extend laterally 656 can
With by opening ratio of elongation and related to recess width 654.Aperture efficiency and opening ratio of elongation may be at wrapping as described herein
Include as in the range of being discussed relative to Fig. 4.Release opening 652 can also include opening depth 657, the opening depth 657
At least partly extended laterally by opening aspect ratio (that is, opening depth 657 extends laterally the ratio between 656 with opening) with opening
656 is related.Opening aspect ratio may be at as in the range of being discussed relative to Fig. 4.
Fig. 7 shows the another embodiment of the wherein top recess 751 with release opening 752.With general plane sword
The blade 730 of the top installation on face surface can be positioned in the recess 751 of top.In some embodiments, top recess 751
With the release opening 752 including crooked outline.At least a portion of profile can have the song away from the orientation of top recess 751
Rate, and at least a portion of profile can have (for example, ought be moved in one direction towards the blade face surface of blade 730
When) towards top recess 751 orient curvature.
Top recess side wall 753 can limit recess width 754, and release opening 752 can limit A/F
755th, opening extends laterally 756 and opening depth 757.Can be top recess 751 limit aperture efficiency (that is, A/F 755 with
The ratio between recess width 754), opening ratio of elongation (that is, opening extend laterally the ratio between 756 and recess width 754) and opening aspect ratio
(that is, the depth 757 that is open extends laterally the ratio between 756 with opening), and they may be at the scope as discussed relative to Fig. 4
It is interior.
Although the embodiment of the disclosure includes top recess and discharging towards the interface between the surface on stratum
Mouthful, but in some embodiments, release opening or recess can be formed in the interface of blade surface recess, or in recess not
Same opening position.For example, as shown in fig. 7, top recess 751 can include release groove/recess 744 at recess bottom.It is this
Release recess 744 can extend laterally as shown in the figure beyond recess width 754, or beyond recess depth (referring to the void in Fig. 8
Line).
Fig. 8 shows that recess has another embodiment of the blade of stress relief element.Stress relief element can be determined
Position is near the opening of recess or its, to reduce the stress concentration at the surface of blade 818 (or other parts of drill bit).
In Fig. 8, the blade 830 and blade 818 of top installation may be subjected to residual stress as described herein.The cutting member of blade surface installation
Part 825 can may also as described herein be subjected to residual stress.For example, a part for blade 818 may push up during cooling
The blade 830 of portion's installation, cut and shunk around blade 825 or both, and residual stress may be along the table towards stratum
Face 822 is concentrated on around the blade surface recess of top recess 851, forward surface and fixing cutting blade 825, anterior and top recess
Rear portion or bottom at, at other positions or combinations thereof.The blade 830 of top installation can be cutting element；However, blade
830 can be used for being different from cutting or function in addition to cutting.For example, blade 830 can be used to limit cutting element
The tungsten carbide or coarse sand hot pressing blade of 825 cutting depth.Similarly, cut blade 825 can with or may not be usable for cutting ground
Layer or another workpiece.For example, blade 825 can be footpath rule isolator.
Top recess 851 can be positioned at towards in the surface 822 on stratum.Top installation blade 830 can (for example,
By soldering, press-fitting, mechanical attachment etc.) load and be fastened in the recess 851 of top.In some embodiments, top recess
851 can have a release opening 852, and the release opening 852, which is used to reducing, to be fastened the soldering of blade 830 or otherwise
Residual stress concentrations caused by after in top recess 851.Release opening 852 can have variously-shaped, profile or other
Any of configuration.Release opening 852 can extend around at least a portion of top recess 851, and in some realities
Apply in scheme, release opening 852 can extend around the whole circumference of top recess 851 or periphery.For example, release opening
852 can be in the range of with the lower limit including the following, higher limit or both lower limit and higher limit a part
Surrounding extends：In 20%, 30%, 40%, 50%, 60%, 75%, 90% or the 100% of circumference/periphery of top recess 851
Any one, or value therebetween.For example, release opening 852 can the circumference of top recess 851 at least 50% or at least
75% surrounding extends.In other instances, release opening 852 can be at least the 90% of the circumference of top recess 851, or top
50% to the 100% surrounding extension on the periphery of recess 851.In other embodiments, release opening 852 can be in top recess
851 periphery or 20% surrounding that is less than of circumference extend.Any discharging in the blade surface recess 832 around cutting blade 825
Mouth or recess can be similarly configured to extend around the circumference of blade surface recess or the whole of periphery or Part portions.Separately
Outside, in some embodiments, release recess can be positioned at the whole of the rear wall of corresponding recess (for example, blade surface recess 832)
Around individual or Part portions, wherein recess depths extend beyond the rear wall as indicated by the dotted lines in figure 8.
Recess at the top of one group of example of the embodiment according to the disclosure is tested to assess neighbouring top recess
The stress concentration of position in drill main body, in the stress raiser, have been recognized that and crackle occurs.For comparing mesh
, generate the baseline sample without release opening.In release opening sample, top recess includes being extended recess
Bent portion, and the linear segment similar to Fig. 6, its split shed is completely on the top of the circumference of top recess, i.e. blade
Portion's recess and towards between the surface on stratum interface extend.Top recess has between 1.14:1 and 1.16:Opening between 1
Mouth compares and between 0.07:1 and 0.08:Opening ratio of elongation between 1.Soldering thickness is identical with baseline sample, except that release
Opening, the release opening have the soldering thickness of increase.Finite element analysis shows that each recess has reduced stress concentration,
And the amount of reduction changes from 22.3% to 25.0%, it is 23.6% that wherein mean stress, which concentrates decrement,.
Fig. 9-1 shows the implementation of the blade 918 (for example, main blade or auxiliary-blade) according to some embodiments of the disclosure
Scheme.Blade 918 can have one or more cutting elements 925, and the cutting element 925 is attached to institute from blade surface or front portion
Blade 918 is stated, the cutting face 926 of wherein cutting element 925 substantially flushes with forward surface 921；And optionally from blade 918
The surface 922 towards stratum extend.However, in other embodiments, cutting element 925 can be with the surface towards stratum
922 is substantially flush or be even embedded, or can extend or be embedded from towards the surface 922 on stratum.Shown cuts
Cut element 925 and be shown as including some (for example, being attached to the diamond table of substrate), but cutting element 925 can be with
Including more than two part, or single part can be included.
Cutting element 925 can be fastened to blade 918 in corresponding blade surface recess 932.In some embodiments, cut
Cutting element 925 can be fastened in blade surface recess 932 in the following manner：Frictional fit, engaging, compressed fit, Duo Geji
One of tool fastener (for example, pin, screw, positioning screw, clip, fixture, retaining ring, sleeve pipe etc.), one or more adhesives,
Brazing material, welding or its combination.For example, brazing material 933 can be positioned at around cutting element 925, that is, it is positioned at cutting
Between element 925 and the inwall of blade surface recess 932 for limiting blade 918.
Soldering processes for being soldered to cutting element 925 in the blade surface recess 932 of blade 918 can be included by straight
Connect or indirect heating method (for example, using heating furnace, using blowtorch, applying brazing material 933 at high temperature) comes in blade surface recess
932 surroundings heating blade 918, hot machining element 925, or both has concurrently.To blade 918 and cutting element during soldering
925 heating carried out may cause blade 918 (and blade surface recess 932) and cutting element 925 to expand.
In some embodiments, blade 918 can include material of main part (for example, steel, have pass through metal adhesive knot
Matrix material for the tungsten carbide particle being combined etc.), and cutting element 925 can include one or more cutting materials
(for example, tungsten carbide, polycrystalline diamond, cubic boron nitride etc.).Material of main part, which can have, is different from (for example, being more than) cutting material
The thermal coefficient of expansion of material.Cutting material in cutting element 925, the blade 918 around blade surface recess 932 material of main part and its
Between brazing material 933 cooling period, the size of blade surface recess 932 might have bigger change, or to be different from or
Speed more than the size of cutting element 925 changes.Blade surface recess 932, cutting element 925 and brazing material 933 it is unbalanced
Volume change may result in blade 918 of the stress concentration around blade surface recess 932.
Fig. 9-2 shows the detail drawing of the blade surface recess 932 in Fig. 9-1.Blade surface recess 932 can have side wall 934, the side
Wall 934 has the rear end part in the opening of blade surface recess 932 or the fore-end 935 and blade surface recess 932 near it
936.Side wall 934 can extend around the whole or partial circle of cutting element 925.Recess depth 937 can be from side wall
934 fore-end 935 extends to the distance of the thickness through blade 918 of rear end part 936.Cutting element 925 can have
There is cutting element length 942.Blade surface recess 932 and cutting element 925 can have recess width 938 and cutting element wide respectively
Degree 939.When cutting element 9325 and brazing material 933 are at least partially positioned in blade surface recess 932, recess width 938 can
With more than cutting element width 939.The rear surface 940 of cutting element 925 can abut the bottom wall 941 of blade surface recess 932, still
As shown in Fig. 9-2, brazing material 933 can also be positioned between rear surface 940 and bottom wall 941.Cutting element length 942 can be with
Less than recess depth 937, but in other embodiments, cutting element length 942 can be greater than or approximately equal to recess depth
937.In all some embodiments as shown in fig. 9-1, recess depth 937 can be approximately equal to cutting element length 942 and edge
The combination of the thickness of the brazing material 933 on rear surface 940 so that forward surface 921 of the cutting face 926 substantially with blade 918
Flush.
In the cooling procedure after by the soldering of cutting element 925 in blade surface recess 932, material of main part and cutting material
Different thermal coefficient of expansions and therefore expansion/shrinkage factor may produce residual stress near blade surface recess 932.It is remaining
Stress may side wall 934 fore-end 935 and rear end part 936 nearby or part concentrate or be multiplied.It is specific and
Speech, when blade surface recess 932 shrinks around cutting element 925 during cooling, the rear end part 936 and bottom wall of side wall 934
941 intersecting joints may concentrate residual stress.For example, in some embodiments, recess width 938 is less than 100
The combined width of cutting element 925 and brazing material 933 may be less than under ℉ (37.8 DEG C).In this kind of embodiment, side
Wall 934 may be concentrated at the rear end part 936 of side wall 934 to the convergent force of cutting element 925.
Figure 10-1 is the blade surface of the stress concentration around the reduction blade surface recess 1032 in some embodiments of the disclosure
The side cross-sectional view of the embodiment of recess 1032.Cutting element 1025 can be (for example, by the way that cutting element 1025 be brazed to
Side wall 1034, rear wall 1041, or brazing material 1033 is used to both) be fastened in blade surface recess 1032.In some embodiment party
In case, release recess 1044 can be located at the rear end part 1036 of side wall 1034.At least a portion for discharging recess 1044 can
Blade surface recess 1032 (that is, leaving cutting element 1025) is left to bend and be recessed.
In some embodiments, at least one of in parallel to blade surface recess 1032 or sword of recess 1044 is discharged
The profile of the plane of the central axis of piece 1025 can be circular (that is, having constant radius of curvature).In other embodiment party
In case, at least one of profile of release recess 1044 can be oval, parabola shaped, hyperbola or it
Combination (that is, the radius of curvature with change).In other embodiments, at least one of profile for discharging recess 1044 can
To be linear.
In some embodiments, release recess 1044 can have recess depths 1043.Recess depths 1043 can be
Discharge recess 1044 from depth of the rear wall 1041 away from blade surface recess 1032.Recess depths 1043 can be with recess depth 1037
It is related (such as measurement to rear wall 1041).Recess depths ratio can be the ratio between recess depths 1043 and recess depth 1037.At some
In embodiment, recess depths are than can be in lower limit, higher limit or lower limit and the upper limit with the following is included
In the range of both values：1:100、1:50、1:25、1:20、1:15、1:10、1:8、1:4、1:Any one in 2, or therebetween
Any value.For example, recess depths ratio can be between 1:20 and 1:Between 2.In other instances, recess depths ratio can be situated between
In 1:18 and 1:Between 4.In other embodiments, recess depths ratio can be between 1:16 and 1:Between 6.In other implementations
In scheme, recess depths ratio can be less than 1:100 or more than 1:2.
According at least some embodiments, release recess 1044 may not be extended laterally beyond the side of blade surface recess 1032
Wall 1034.For example, it is circle in blade surface recess 1032 and discharges recess 1044 to extend its whole or partial circle feelings
Under condition (for example, in the case where blade surface recess 1032 is configured to receive cylindrical cutting element 1025), recess 1044 is discharged
External diameter can be approximately equal to or less than the external diameter of blade surface recess 1032.Still in other embodiments, such as institute in further detail herein
Description, the external diameter of blade surface recess 1032 can be more than by discharging the external diameter of recess 1044 so that lateral shift be present.To the straight of part
Referring to for footpath is merely illustrative, and in other embodiments, blade surface recess 1032 can have width rather than diameter, all
Such as in other non-circular cross sectional shapes of cutting element 1025 with square, rectangle or for receiving non-cylindrical cutting element
In the case of.
Figure 10-2 shows the blade surface recess 1032 for Figure 10-1 that no cutting element from end-view is positioned in.
In some embodiments, discharging recess 1044 can extend around the part on the periphery of rear wall 1041.In other implementations
In scheme, release recess 1044 can be positioned at around the whole periphery of rear wall 1041.In release recess 1044 in rear wall 1041
Periphery a part around extend in the case of, release recess 1044 can be along in the lower limit including the following
Part extension in the range of value, higher limit or both lower limit and higher limit：The periphery of rear wall 1041 20%, 30%,
40%th, any one in 50%, 60%, 75%, 90% or 100%, or value therebetween.For example, release recess 1044 can be
At least 50%, at least 75% or at least 90% surrounding extension on the periphery of rear wall 1041.Still in other embodiments, discharge
Recess 1044 can extend around 20% to the 100% of rear wall 1041, or at it around 60% to 100%.In other implementations
In scheme, release recess 1044 can extend in being less than around 20% for the periphery of rear wall 1041.In some embodiments, release
It can be annular recess to put recess 1044.
At least a portion of release recess 1044 can have to be surveyed between the inner surface of release recess 1044 and outer surface
The recess width 1045 of amount.Recess width 1045 can be related to recess width 1038.Recess width ratio can be recess width
The ratio between 1045 and recess width 1038.In some embodiments, recess width ratio can be in have to include the following
Higher limit and lower limit in the range of：1:20、1:15、1:10、1:8、1:4、1:Any one in 2, or any value therebetween.
For example, recess width ratio can be between 1:20 and 1:Between 2.In other instances, recess width ratio can be between 1:18
With 1:Between 4.In other embodiments, recess width ratio can be between 1:16 and 1:Between 6.Still in other embodiment party
In case, recess width ratio can be less than 1:20.
Figure 11-1 and Figure 11-2 shows to be configured to the sword for reducing the stress concentration in the blade around blade surface recess 1132
Another embodiment of face recess 1132.Cutting element 1125 can be pressed against side wall 1134 and rear wall by brazing material 1133
1141 and be fastened in blade surface recess 1132.In some embodiments, rear wall 1141 may not intersect with side wall 1134, still
Release recess 1144 can be spaced apart with side wall 1134 at the rear end part 1136 of side wall 1134.In some embodiments,
And as shown in Figure 11-1, at least part of lateral contour of release recess 1144 can be bending, and discharge recess 1144
At least part can be linear.At least part of stress release bending section, which can be recessed, leaves blade surface recess 1132 (i.e.,
It is extended cutting element 1125).
In some embodiments, at least a portion for discharging recess 1144 can have circle in shown lateral contour
Curvature (that is, there is constant radius of curvature).In other embodiments, at least a portion of release recess 1144 can be
Ellipse, parabola shaped, hyperbola or its combination (that is, the radius of curvature with change).In other embodiments
In, at least one of profile of release recess 1144 can be linear.In some embodiments, linear segment 1146 can
Diametrically to be positioned adjacent to rear wall 1141.In identical or other embodiments, linear segment 1146 can be diametrically
The side wall 1134 of neighbouring blade surface recess 1132 positions.
In some embodiments, release recess 1144 can have recess depths 1143.Recess depths 1143 can be
Discharge recess 1144 from depth of the rear wall 1141 away from blade surface recess 1132.Recess depths 1143 can be with recess depth 1137
Correlation, and recess depths ratio can be the ratio between recess depths 1143 and recess depth 1137.In some embodiments, recess
Depth ratio can be in herein in relation in the scope described by Figure 10-1 and Figure 10-2 embodiment.
Figure 11-2 shows the blade surface recess 1132 for Figure 11-1 that no cutting element from end-view is positioned in.
In some embodiments, as described by relative to Figure 10-1 and Figure 10-2, release recess 1144 can be positioned at rear wall 1141
Periphery at least a portion around.In some embodiments, it can be annular recess to discharge recess 1144 so that rear surface
1141 form shelf, and cutting element can be positioned with soldering in blade surface recess 1132 on the shelf or against the shelf
It is interior.
At least a portion for discharging recess 1144 can be with recessed between the inner surface of release recess and outer surface
Portion's width 1145, and the line that the recess width 1145 can be tangent perpendicular to the outside with discharging recess 1144 is surveyed
Amount.The mode and the phase of recess width 1138 that recess width 1145 can be described such as Figure 10-1 and Figure 10-2 recess 1032
Close.
Linear segment 1146 may be constructed the release recess 1144 of any number of different percentage.In some embodiments
In, bent portion width 1147 can be added to obtain recess width 1145 with linear segment width 1148.Bent portion width
1147 can be relative to each other with linear segment width 1148 by bending-linear ratio.In some embodiments, bending-line
Property than can be have include the lower limit, higher limit or lower limit of the following and the scope of both higher limits：50:1、25:
1、15:1、10:1、5:1、3:1、2:1、1:1、1:2、1:3、1:5、1:10、1:15、1:25、1:Any one in 50, or therebetween
Any value.For example, bending-linear ratio can be between 50:1 and 1:Between 50.In other instances, bending-linear ratio can
To be between 25:1 and 1:Between 25.In other instances, bending-linear ratio can be between 5:1 and 1:Between 5.At least
In one example, bending-linear ratio can be between 2:1 and 1:Between 2, or it is about 1:1.In other embodiments, bend-
Linear ratio can be more than 50:1 or less than 1:50.In a further embodiment, it is understood that there may be multiple bent portions are (referring to figure
12-1), and bend-linear ratio can be bent portion combined width contrast one or more linear segments combination it is wide
Degree.
Figure 12-1 and Figure 12-2 shows to be configured to reduce main blade, auxiliary-blade or other knives around blade surface recess 1232
Another embodiment again of the blade surface recess 1232 of stress concentration in piece.Brazing material 1233 can be used for cutting element
1225 are fastened in blade surface recess 1232 against side wall 1234 and rear wall 1241.In some embodiments, rear wall 1241 can
So that release recess 1244 is spaced apart with side wall 1234 at the rear end part 1236 of side wall 1234.In some embodiments, exist
In lateral contour shown in Figure 12-1, at least part of release recess 1244 can be bending.Optionally, recess 1244 is discharged
One or more parts can be linear.In some embodiments, it is understood that there may be multiple bent portions are (for example, first
Bent portion is in the interface of side wall 1234, and arc or the second bent portion are in the interface on rear surface 1241).Should
At least part of power release recess, which can be recessed, leaves blade surface recess 1232 (that is, in the cutting tip with cutting element 1225
1226 opposite anti-upward out rear surfaces 1241).
In some embodiments, in the profile shown in Figure 12-1, at least a portion of release recess 1244 can be
Circular (that is, there is constant radius of curvature).In other embodiments, at least one of profile of recess 1244 is discharged
It can be oval, parabola shaped, hyperbola or its combination radius of curvature of change (that is, have).In other realities
Apply in scheme, at least one of longitudinal profile of release recess 1244 can be linear.
In some embodiments, release recess 1244 can have recess depths 1243.Recess depths 1243 can be
Discharge recess 1244 from depth of the rear wall 1241 away from blade surface recess 1232.Recess depths 1243 can as Figure 10-1 and
The recess depths 1043 of embodiment in Figure 10-2 are related to recess depth 1237 as describing.
Referring still to Figure 12-1, release recess 1244 can extend laterally out from the rear wall 1241 of blade surface recess 1232 and
(that is, extended to beyond side wall 1234 outside the diameter/width of side wall 1234).Release recess 1244, which can have, to be extended laterally
1249.It can be positive or negative to extend laterally 1249.As illustrated, for example, side wall can be extended beyond by extending laterally 1249
1234, and can be just when ratio is big at side wall 1234 at release recess 1244 in the diameter/width of blade surface recess 1232
's.By contrast, if the diameter/width of blade surface recess 1232 ratio at release recess 1244 is small at side wall 1234, then
Extend laterally 1249 be considered it is negative.Release recess 1244 extend laterally 1249 can be recess width 1245 extremely
Small part and as shown in fig. 12-2 as at least partly it is related to recess width 1238.
Figure 12-2 shows the blade surface recess 1232 for Figure 12-1 that no cutting element from end-view is positioned in.
In some embodiments, discharging recess 1244 can be as described herein with the class of release recess 1044 with Figure 10-1 and Figure 10-2
As mode be positioned at around at least a portion of rear wall 1241, and may be positioned at around the whole circumference of rear wall 1241.
Discharge at least a portion of recess 1244 can have perpendicular to discharge the tangent line in outside of recess 1244 and
The recess width 1245 of measurement.Recess width 1245 can be related to recess width 1238.Recess width ratio can be that recess is wide
The ratio between 1245 and recess width 1238 are spent, and may be at the release recess with Figure 10-1 and Figure 10-2 as described herein
In 1044 similar scopes.
Extending laterally for release recess 1,244 1249 can be being extended to outside recess width 1238 for timing, or to be negative
When extend in the recess width 1238.In some embodiments, extend laterally 1249 can by extension-recess ratio and with it is recessed
Portion's width 1245 is related.Extension-recess is than can extend laterally 1249 the ratio between with the absolute value of recess width 1245.At some
In embodiment, extension-recess is than may be at lower limit, higher limit or the lower limit and higher limit for including the following
In the range of：1:100、1:50、1:20、1:10、1:8、1:4、1:3、1:Any one in 2, or any value therebetween.For example,
Extension-recess ratio can be between 1:100 and 1:Between 2.In other instances, extension-recess ratio can be between 1:50 with
1:Between 3.In other instances, extension-recess ratio can be between 1:20 and 1:Between 4.Still in other examples embodiment party
In case, extension-recess ratio can be less than 1:100 or more than 1:2.
There is the release recess 1244 for the radial outside for being at least partially disposed at blade surface recess 1232 in blade surface recess 1232
In embodiment, release recess 1244 can limit total recess width 1250 more than recess width 1238.Total recess ratio can be with
It is the ratio between total recess width 1250 and recess width 1238.In some embodiments, total recess ratio may be at having and include
In the range of the lower limit of the following, higher limit or both lower limit and higher limit：1.25:1、1.20:1、1.15:1、
1.10:1、1.08:1、1.04:1、1.02:1、1.01:Any one in 1, or any value therebetween.For example, total recess ratio can be with
It is between 1.25:1 and 1.01:Between 1.In other instances, total recess ratio can be between 1.20:1 and 1.02:Between 1.
In other examples, total recess ratio can be between 1.15:1 and 1.04:Between 1.In at least one example, total recess ratio can be with
It is about 1.05:1.Still in other embodiments, total recess ratio can be more than 1.25:1 or less than 1.01:1.For example, releasing
Put recess 1244 diametrically within the blade surface recess 1232 and exist it is negative extend laterally 1249 in the case of, total recess ratio
1 can be less than:1.
One group of example blade surface recess of the embodiment according to the disclosure is tested and added with assessing soldered fitting
Discharge intensity during recess.Also locating active face recess is analyzed to assess the position in the drill main body of neighbouring blade surface recess
Stress concentration, in the stress raiser, have been recognized that and crackle occur.For comparative purposes, generate without release
The baseline sample of recess.
In recess sample is discharged, blade surface recess includes the circular release recess similar to Figure 10-1, wherein circular contour
Extend completely in the circumference of circular back wall.Blade surface recess has between 1:5 and 1:Recess depths ratio between 15, between 1:
3 and 1:Recess width ratio and 1 between 10:1 total recess ratio.Soldering thickness is identical with baseline sample, except that release is recessed
Portion, the release recess have the soldering thickness of increase.Final pull-out test is shown, relative to recessed without corresponding release
The baseline soldered fitting in portion, release recess cause soldering joint strength averagely to increase by 11.5%.Also have to identical joint
Finite element analysis is to compare stress concentration.The analysis shows that each recess has a reduced stress concentration, and the amount of reduction from
It is 20.4% that decrement is concentrated in 6.8% to 33.2% change, wherein mean stress.
Although discussing release recess herein in relation to blade surface recess, in other embodiments, release recess can
To be used in combination together with other features, such as top recess, standby recess etc..Figure 13 shows blade surface recess 1332 and top
Recess 1351 has another embodiment of corresponding stress relief element 1344-1,1344-2 blade 1318.Stress is released
Put element 1344-1,1344-2 to can be positioned at the rear portion or bottom of recess or near it, to reduce (or the drill bit of blade 1318
Other parts) in deviate blade 1318 blade surface, footpath rule pad or other features opening position stress concentration.In fig. 13,
It is such as described herein with reference to the cutting element (for example, cutting element 1325) of anterior installation or blade surface installation, the sword of top installation
Piece 1330 and blade 1318 may be subjected to residual stress.For example, a part for blade 1318 may push up during cooling
The surrounding of blade 1330 of portion's installation is shunk, and residual stress may be concentrated at the bottom of top recess 1351 or its is attached
Closely, concentrated at the surface 1322 towards stratum around top recess 1351 or along the surface 1322 towards stratum or
At any different other positions of person.The blade 1330 of top installation can be referred to as cutting element herein；However, blade
1330 can be used for being different from cutting or function in addition to cutting.For example, blade 1330 can be used to limit cutting member
The tungsten carbide or coarse sand hot pressing blade of the cutting depth of part 1325.
Top recess 1351 can be positioned at towards in the surface 1322 on stratum.The blade 1330 of top installation can (example
Such as, by soldering, press-fitting, mechanical attachment etc.) load and be fastened in the recess 1351 of top.In some embodiments, top
Recess 1351 can have release recess 1344-2, the release recess 1344-2 be used to reducing by the soldering of blade 1330 or with
Other modes caused residual stress concentrations after being fastened in the recess 1351 of top.Discharging recess 1344-1 can have such as
Any of the variously-shaped of those disclosed herein, profile or other configurations.Discharging recess 1344-2 can be recessed at top
Extend around at least a portion of nest 1351, and in some embodiments, release recess 1344-2 can have at top
The annular shape extended around the whole circumference of the rear wall of recess 1351 or periphery.For example, release recess 1344-2 can have
There is the lower limit including the following, extend around the part in the range of higher limit or both lower limit and higher limit：Top
Any one in 20%, 30%, 40%, 50%, 60%, 75%, 90% or the 100% of circumference/periphery of portion's recess 1351, or
Value therebetween.For example, release recess 1344-2 can circumference/periphery of top recess 1351 at least 50% or at least
135% surrounding extends.In other instances, discharging recess 1344-2 can be on circumference/periphery of the rear wall of top recess 1351
At least 90%, or extend around 50% to the 100% or 60% to 100% of circumference/periphery of top recess 1351.
In other embodiments, release recess 1344-2 can extend in being less than around 20% for circumference/periphery of rear wall 1341.
Any element described relative to any embodiment for showing herein can with it is any relative to what is shown herein
Any other element combination of other embodiments description.For example, release recess 1344-1,1344-2 can have relative to figure
The shape of any release recess shown or described 10-1 to Figure 12-2.Although in addition, herein in relation to blade surface and top recess
The rear wall of (for example, serving as the stress release recess of the stress at rear wall or bottom wall or near it) or bottom wall and rear portion or bottom
Surface description and the embodiment for illustrating release recess, but in some embodiments, blade surface, top or other recesses can
To include release recess or opening in another opening position.For example, release recess or opening can be formed neighbouring towards stratum
Surface recess around (referring to the dotted line around the recess 1351 in Figure 13), or any opening position along recess side wall,
In these opening positions, stress release is probably needs.
Any element described relative to any embodiment for showing herein can with it is any relative to what is shown herein
Any other element combination of other embodiments description.For example, Fig. 4 to Fig. 7 and Fig. 9-1 to Figure 12 release recess or opening
Can be in Fig. 2, Fig. 8 or Figure 13 blade.
The drill bit and cutting element of the disclosure can be formed in any number of ways.For example, drill main body can be casting
(for example, sand casting, model casting, die casting etc.), machining or carry out shape using increasing material manufacturing (for example, 3D printing)
Into.Th drill main bodies can be formed by any number of material, including steel, composite, have by metal adhesive combination
Matrix material of tungsten carbide particle together etc..Forming drill main body can include forming blade (or the institute from main body extension
State the cutting face of blade).Blade well matched as described herein can be put, and in some embodiments can in forward surface or
Include one or more recesses towards the surface on stratum.In some embodiments, recess can be by being machined or leading to
Cross using layer of sand Replacement Part to be formed.For example, the layer of sand Replacement Part with circumference or annular ridge can be positioned in mould simultaneously
And for forming the cutting edge recess with circumference or annular recess.Cutting element can be for example, by heating drill main body, cutting
Cut element and brazing material and be positioned in recess and be soldered in recess.After soldering is completed, can reduce blade and
The temperature (for example, except stopping application heat) of cutting element.Due to thermal coefficient of expansion, blade and cutting element may be with not
Same speed thermal contraction.For example, blade may be shunk with the speed of the speed more than or less than cutting element.In some implementations
In scheme, different coefficient of thermal expansions can produce stress concentration.Stress concentration can be by other in bottom, blade surface or recess
Opening position is reduced using stress release recess or opening.Stress release recess can be led to by being machined to recess
Original cast is crossed, is machined, or for forming the increasing material manufacturing technique of drill main body or otherwise being formed.
Although the embodiment that Primary Reference pit shaft drilling operation describes drill bit and recess, described herein
Drill bit and recess can be used in the application in addition to pit shaft is drilled.In other embodiments, in pit shaft or can be used for
The drill bit or recess according to the disclosure are used beyond other subsurface environments of exploration or exploitation natural resources.For example, the disclosure
Drill bit and recess, which can be used in, to be used to lay in the drilling of utility line, or the drill bit for machining or manufacturing process
In.Therefore, term " pit shaft ", " drilling " etc. are not necessarily to be construed as being limited to appoint by the instrument of the disclosure, system, component or method
What specific industry, field or environment.
Article "one", " one kind " and " described " be meant that one or more elements in previous description be present.Art
Language "comprising", " comprising " and " having " are intended to inclusive implication, and mean in addition to listed element, may also have other yuan
Part.In addition, it should be understood that referring to being not intended as and be interpreted to exclude to " embodiment " or " embodiment " of the disclosure
Also in relation with the presence of other embodiments of the feature.For example, unless this category feature is described as or it is substantially phase
Mutually repel, any element otherwise described relative to embodiments herein can be with any other embodiment described herein
Any element combination.Such as those of ordinary skill in the art it will be appreciated that, numeral, percentage, ratio or other values as described herein
Be intended to include described value, and " being approximately equal to " or " approximation " described value for being covered of embodiment of the also disclosure other
Value.Therefore described value is interpreted broadly to cover at least close enough to described value so that required function or realization can be performed
The value of required result.Described value comprises at least expected change in suitable manufacture or production technology, and can be included in institute
State the value in the 5% of value, in 1%, in 0.1% or in 0.01%.Described combining one group of possible lower limit or higher limit
In the case of scope, each value can be used as single value to be used in open scope (for example, at least 50% or up to 50%), or
Two values of person can be combined to limit scope (for example, between 50% and 75%).
In view of the disclosure, it will be appreciated by those of ordinary skill in the art that equivalent constructions without departing from the disclosure spirit and
Scope, and in the case where not departing from spirit and scope of the present disclosure, embodiment disclosed herein can be carried out various
Change, substitute and change.Equivalent constructions including feature " device adds function " clause are intended to covering and are described herein as performing institute
The structure of function is stated, including both equivalent structures of the structural equivalents operated in the same manner and offer identical function.Application
Other Functional Requirements for being clearly not intended to device to be carried out and adding function or any claim of people, words ' are used for ...
Device ' except situation about occurring together with associated function.The implication fallen in claim carried out to embodiment
Claim is all contained in each addition in scope, deletion and modification.
Term " approximation ", " about " and " substantially " as used herein represents to still carry out required function close to the amount
Or the amount of result needed for realizing.For example, term " approximation ", " about " and " substantially " may refer to difference the amount be less than 5%
It is interior, less than in 1%, less than 0.1% in and less than 0.01% in amount.In addition, it should be understood that any side in previous description
To or referential be only relative direction or motion.For example, "up" and "down" or " top " or any of " lower section " are referred to only
Illustrate relative position or the motion of related elements.
The disclosure can embody in other specific forms in the case of without departing from its spirit or feature.Described implementation
Scheme should be considered be illustrative rather than it is restricted.Therefore by appended claims rather than finger is described above in the scope of the present disclosure
It is bright.Change in the implication and equivalent scope of claim is comprised in the range of the claim.
Claims (20)
1. a kind of drill bit, the drill bit includes：
Drill main body；
Multiple blades, the multiple blade extend from the drill main body, and the multiple blade has each at least partly by rear
Multiple recesses that wall and side wall limit, at least one in the multiple recess include ring in its described side wall or the rear wall
Shape stress relief element；And
Blade, the blade be soldered in the multiple recess it is described it is at least one in.
2. drill bit as claimed in claim 1, the belt stress releasing member is the whole circle of the rear wall of the recess
The recess of surrounding.
3. drill bit as claimed in claim 1, the blade is cutting element or cutting depth limiter.
4. drill bit as claimed in claim 1, the blade has the thermal coefficient of expansion less than the drill main body.
5. drill bit as claimed in claim 1, the belt stress releasing member be the release opening in the side wall and
Extend around the whole circumference of the recess of the front part relative with the rear wall of the neighbouring recess.
6. a kind of drill bit, the drill bit includes：
Drill main body；And
Cutting face, the cutting face are attached to the drill main body, and the cutting face is included wherein with least one recess
Surface, at least one recess are at least partly limited by rear wall and side wall, and at least one recess includes release opening, institute
The interface that release opening is at least one recess and the surface is stated, and on the periphery of at least one recess
At least 75% surrounding extension.
7. drill bit as claimed in claim 6, the release opening is around the whole periphery of at least one recess
Extension.
8. drill bit as claimed in claim 6, the release opening has opening depth and at least one top recess
With recess depth, the opening depth ratio of the opening depth and the recess depth is between 1:20 and 1:Between 2.
9. drill bit as claimed in claim 6, the release opening includes the opening for extending laterally the width beyond the recess
Extend laterally, the release opening has between 0.10:1 and 0.04:The opening between 1 extends laterally and recess width
Be open ratio of elongation.
10. drill bit as claimed in claim 6, the release opening has the opening for extending laterally the width beyond the recess
Extend laterally and be open depth, and the opening depth and the opening extend laterally restriction between 15:1 and 1:Opening between 15
Aspect ratio.
11. drill bit as claimed in claim 6, the release opening has at least partly bending or at least partly linear wheel
It is wide.
12. drill bit as claimed in claim 6, it also includes blade, and the blade is with brazing material soldering described at least one
In individual recess, the blade has the thermal coefficient of expansion different from the drill main body.
13. drill bit as claimed in claim 12, at least one recess has under less than 100 ℉ (37.8 DEG C) is less than institute
State the recess width of blade and the combined width of the brazing material.
14. drill bit as claimed in claim 6, at least one recess includes top recess and the drill bit is also described
Top recess includes blade, and the side wall of the top recess applies compression stress to the blade.
15. a kind of drill bit, the drill bit includes：
Drill main body；And
Blade, the blade extend from the drill main body, and the blade includes the surface wherein with least one recess, institute
State at least recess to be limited by side wall and rear wall, at least one recess includes release in the rear between wall and the side wall recessed
Portion, the release recess have the recess depths of the recess depth beyond at least one recess.
16. drill bit as claimed in claim 15, the release recess is the annular recess for the rear wall for surrounding the recess.
17. drill bit as claimed in claim 15, the recess deep ratio of the recess depths and the recess depth is between 1:
15 and 1:Between 5.
18. drill bit as claimed in claim 15, the release recess has recess width and at least one recess tool
There is recess width, the recess width and the recess width ratio of the recess width are between 1:10 and 1:Between 3.
19. drill bit as claimed in claim 15, the release recess has at least one of transverse direction beyond the side wall
Extension, and the extension-recess ratio extended laterally with recess width is between 1:100 and 1:Between 2.
20. drill bit as claimed in claim 15, the release recess has at least partly bending and at least partly linear wheel
Bending-linear ratio of exterior feature, wherein bent portion width and linear segment width is between 50:1 and 1:Between 50.
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US201662320045P | 2016-04-08 | 2016-04-08 | |
| US201662320076P | 2016-04-08 | 2016-04-08 | |
| US62/320,045 | 2016-04-08 | ||
| US62/320,076 | 2016-04-08 | ||
| US15/477,898 US20170292330A1 (en) | 2016-04-08 | 2017-04-03 | Cutting element pocket with relief features |
| US15/477,898 | 2017-04-03 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107476766A true CN107476766A (en) | 2017-12-15 |
Family
ID=59999040
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710229883.7A Pending CN107476766A (en) | 2016-04-08 | 2017-04-10 | Cutting element recess with release characteristic |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US20170292330A1 (en) |
| CN (1) | CN107476766A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110439471A (en) * | 2019-09-06 | 2019-11-12 | 中石化江钻石油机械有限公司 | A kind of cutting depth self-regulating mechanism and drill bit |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11585157B2 (en) * | 2020-03-18 | 2023-02-21 | Baker Hughes Oilfield Operations Llc | Earth boring tools with enhanced hydraulics adjacent cutting elements and methods of forming |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3693736A (en) * | 1969-09-04 | 1972-09-26 | Mission Mfg Co | Cutter insert for rock bits |
| US3749190A (en) * | 1971-05-06 | 1973-07-31 | Ingersoll Rand Co | Retaining carbide in rock drill bits |
| US4289211A (en) * | 1977-03-03 | 1981-09-15 | Sandvik Aktiebolag | Rock drill bit |
| CN1443267A (en) * | 2000-05-18 | 2003-09-17 | 联邦科学及工业研究组织 | Cutting tool and method of using same |
| US6823952B1 (en) * | 2000-10-26 | 2004-11-30 | Smith International, Inc. | Structure for polycrystalline diamond insert drill bit body |
| US20140007519A1 (en) * | 2010-12-22 | 2014-01-09 | Element Six Abrasives S.A. | Composite part including a cutting element |
-
2017
- 2017-04-03 US US15/477,898 patent/US20170292330A1/en not_active Abandoned
- 2017-04-10 CN CN201710229883.7A patent/CN107476766A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3693736A (en) * | 1969-09-04 | 1972-09-26 | Mission Mfg Co | Cutter insert for rock bits |
| US3749190A (en) * | 1971-05-06 | 1973-07-31 | Ingersoll Rand Co | Retaining carbide in rock drill bits |
| US4289211A (en) * | 1977-03-03 | 1981-09-15 | Sandvik Aktiebolag | Rock drill bit |
| CN1443267A (en) * | 2000-05-18 | 2003-09-17 | 联邦科学及工业研究组织 | Cutting tool and method of using same |
| US6823952B1 (en) * | 2000-10-26 | 2004-11-30 | Smith International, Inc. | Structure for polycrystalline diamond insert drill bit body |
| US20140007519A1 (en) * | 2010-12-22 | 2014-01-09 | Element Six Abrasives S.A. | Composite part including a cutting element |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110439471A (en) * | 2019-09-06 | 2019-11-12 | 中石化江钻石油机械有限公司 | A kind of cutting depth self-regulating mechanism and drill bit |
Also Published As
| Publication number | Publication date |
|---|---|
| US20170292330A1 (en) | 2017-10-12 |
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Application publication date: 20171215 |