CN103249906B - The fixing means of sintered carbide tools and hard tip be - Google Patents
The fixing means of sintered carbide tools and hard tip be Download PDFInfo
- Publication number
- CN103249906B CN103249906B CN201080061997.1A CN201080061997A CN103249906B CN 103249906 B CN103249906 B CN 103249906B CN 201080061997 A CN201080061997 A CN 201080061997A CN 103249906 B CN103249906 B CN 103249906B
- Authority
- CN
- China
- Prior art keywords
- hard tip
- pressure ring
- contact
- hole
- diameter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 230000002093 peripheral effect Effects 0.000 claims abstract description 32
- 239000011159 matrix material Substances 0.000 claims abstract description 29
- 238000003825 pressing Methods 0.000 claims abstract description 13
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 12
- 239000010959 steel Substances 0.000 claims abstract description 12
- 238000003801 milling Methods 0.000 abstract description 9
- 238000000034 method Methods 0.000 description 14
- 238000005520 cutting process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000003818 cinder Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 238000005476 soldering Methods 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 208000037656 Respiratory Sounds Diseases 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005219 brazing Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000007429 general method Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000009527 percussion Methods 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28D—WORKING STONE OR STONE-LIKE MATERIALS
- B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
- B28D1/14—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by boring or drilling
-
- 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
-
- 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
- E21B10/58—Chisel-type inserts
-
- 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
- E21B10/62—Drill bits characterised by parts, e.g. cutting elements, which are detachable or adjustable
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/12—Opening or sealing the tap holes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D3/15—Tapping equipment; Equipment for removing or retaining slag
- F27D3/1509—Tapping equipment
- F27D3/1527—Taphole forming equipment, e.g. boring machines, piercing tools
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mechanical Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
- Processing Of Stones Or Stones Resemblance Materials (AREA)
- Percussive Tools And Related Accessories (AREA)
- Connection Of Plates (AREA)
- Hand Tools For Fitting Together And Separating, Or Other Hand Tools (AREA)
Abstract
A practical fixing means for hard tip be in instrument and this instrument, the hard tip be such as superhard contact are fixed in the matrix of steel by this instrument, and are mainly applicable to out the opening etc. of hole milling.The feature of sintered carbide tools is, hard tip be is embedded in the contact apertures of the band negative thread be located on the matrix of steel, and is threadedly engaged from the upper side by pressure ring, fix to carry out pressing to described hard tip be, wherein, described by pressure ring outside perimembranous there is the pin thread screwed togather with described contact apertures.It is preferable that, in advance the outer peripheral face of described hard tip be is formed as the coniform inclined plane that little, downside (base portion side) the diameter of diameter of upside (front) is large, and the described inner peripheral surface by pressure ring is formed as the trumpet-shaped inclined plane with the coniform inclined plane close contact of this hard tip be.
Description
Technical field
The present invention relates to the fixing means that a kind of use is provided with the hard tip be in the instrument (hereinafter referred to as " sintered carbide tools ") of the contact (hereinafter referred to as " hard tip be ") of the superhard alloy or pottery etc. cutting drill, percussion tool and so on.
Background technology
In the matrix of steel, hard tip be (being generally superhard contact) is implanted in a lot of situation such as the Surface Finishing instrument cutting drill or use in lapicide.As the mounting method of above-mentioned hard tip be, the most general method is on matrix, wear the contact apertures chimeric with hard tip be, and hard tip be is chimeric with this contact apertures and carry out method or the shrunk fit method of soldering.
But, when heating target thing is high temperature, use above-mentioned method for brazing or shrunk fit method can be heated to high temperature to the instrument self that hard tip be is fixed, therefore, there is hard tip be impaired or such problem that comes off under the effect of thermal stress.Such as, ore furnace go out hole milling melt cast iron go out milling at the end of again close and move to next melting operation, but, when carry out this opening going out hole milling with drill bit and closed time planarized (need carry out planarized to make the leading section of closed mud gun (mud gun) with going out hole milling opening circumference close contact) of opening portion, because furnace wall is in high temperature, therefore, if use drill bit that hard tip be is carried out to the drill bit after soldering or carried out after shrunk fit, superhard contact can be there is and to come off such problem at once.
In digging instrument, as the fixing means of contact difficult drop-off, there will be a known method such disclosed in patent document 1.This method forms concaveconvex shape in the side of the base end part of contact, and carry out the method for welding in the mode covering its side.
Prior art document
Patent document
Patent document 1: Japanese Patent Laid-Open 2003-214080 publication
Summary of the invention
Invent technical problem to be solved
In the method described in above-mentioned patent document 1, owing to being the method that the mode of the outer peripheral face covering contact is directly welded, therefore, can think that contact can also firmly be kept, but, when the superhard contact that material is very crisp, under the impact of thermal shock etc., may crackle be there is, therefore, have problems in actual use.In addition to the method described above, although also considered certain methods, also cannot determine at present can the fixing means of actual use of superhard contact etc. of high temperature resistant use.Therefore, technical problem to be solved by this invention is to provide a kind of and also the hard tip be of superhard contact etc. firmly can be kept when at high temperature using, the fixing means being not easy to occur to come off etc.
The technical scheme that technical solution problem adopts
For solving the problems of the technologies described above, the invention provides fixing means as described below.Namely, the feature of the sintered carbide tools that technical scheme 1 is recorded is, hard tip be is embedded in the contact apertures of the band negative thread be located on the matrix of steel, and be threadedly engaged from the upper side by pressure ring, fix to carry out pressing to hard tip be, wherein, above-mentioned have the pin thread screwed togather with the negative thread of above-mentioned contact apertures by pressure ring.In addition, the feature of the fixing means of the hard tip be described in technical scheme 2 is, the diameter contact apertures larger than the external diameter of hard tip be is provided with in the proper site of the matrix of steel, the inner peripheral portion of this contact apertures forms negative thread, by little for the diameter with leading section, the hard tip be of the inclination outer peripheral face that the diameter of base portion side increases gradually embeds above-mentioned contact apertures, and above-mentioned hard tip be is being inserted under the state of the through hole by pressure ring, this negative thread by pressure ring and above-mentioned contact apertures is screwed togather, to press hard tip be, the screwed hole by this hard tip be being fixed on matrix is inner, wherein, above-mentioned by pressure ring outside perimembranous be formed with the pin thread screwed togather with the negative thread of above-mentioned contact apertures, and be formed with the through hole with the periphery close contact of above-mentioned hard tip be in inner peripheral portion.In above-mentioned fixing means, described in technical scheme 3, it is preferable that, in advance by the above-mentioned inner surface pressing pressure ring in the mode of the outer peripheral face close contact with hard tip be, be formed as the inclined plane that downside is wide, upside is narrow.In addition, the feature of the fixing means of the hard tip be described in technical scheme 4 is, the diameter contact apertures larger than the external diameter of hard tip be is provided with in the proper site of the matrix of steel, the inner peripheral portion of this contact apertures forms negative thread, the hard tip be being formed with the flange stretched out towards peripheral direction in bottom is embedded above-mentioned contact apertures, and above-mentioned hard tip be is being inserted under the state of the through hole by pressure ring, this negative thread by pressure ring and above-mentioned contact apertures is screwed togather, to press the flange of hard tip be, the screwed hole by this hard tip be being fixed on matrix is inner, wherein, above-mentioned by pressure ring outside perimembranous be formed with the pin thread screwed togather with the negative thread of above-mentioned contact apertures.
Invention effect
Sintered carbide tools of the present invention, owing to using the threaded inside by pressure ring, hard tip be mechanical compression being fixed on contact apertures, therefore can use under such condition of high temperature such as milling outlet opening of ore furnace.In addition, according to the fixing means of hard tip be of the present invention, under the state that hard tip be is chimeric with the contact apertures being located at matrix, utilize and press by the top of pressure ring from hard tip be, and should to screw togather by the negative thread of the inner peripheral portion of pressure ring and contact apertures and affixed, therefore, hard tip be firmly can be kept.In above-mentioned fixing means, hard tip be can not be heated to high temperature because of fixing, therefore, hard tip be can not crack.In addition, owing to not using solder, the shrunk fit method of thermal expansion is also different from utilizing, and therefore, does not at high temperature also worry that contact comes off even if in use expose.
Accompanying drawing explanation
Fig. 1 is the sectional view representing fixing means of the present invention.
Fig. 2 is the sectional view of the step representing above-mentioned fixing means.
Fig. 3 is top view (a) and the lateral view (b) of matrix.
Fig. 4 is the sectional view two of matrix kinds of contact apertures being divided into left and right to carry out representing.
Fig. 5 is the longitudinal section of matrix.
Fig. 6 is the top view (a) and the lateral view (b) that hole milling opening drill bit.
Fig. 7 represents the sectional view from above-mentioned different embodiment.
Fig. 8 is the sectional view under embodiment is in affixed state.
Fig. 9 is the figure representing the reference example different from embodiment.
Figure 10 is the sectional view under reference example is in affixed state.
Detailed description of the invention
Below embodiments of the present invention are specifically described.
Embodiment 1
Fig. 1 is exemplified with sintered carbide tools of the present invention, and chimeric in the contact apertures 2 of matrix 1 head being located at steel to have hard tip be 3(be in the case superhard contact) base portion.The bottom surface of contact 3 and bottom surface 7 close contact of contact apertures 2.
As shown in Figure 2, hard tip be 3 is made up of head 3a, main part 3b and base portion 3c, and head 3a is formed as the large roughly shell shape of the diameter diameter that is little, main part side of leading section.Main part 3b is identical cylindric of diameter, and the cross section that the diameter diameter that is little, base portion side that base portion 3c is formed as main part side increases gradually is cone shape inclined plane.
The internal diameter of the contact apertures 2 of matrix 1 is larger than the external diameter of the largest portion of the base portion of hard tip be 3, keeps suitable gap 4 between contact apertures internal face and contact outer peripheral face.Negative thread 2a is formed in the inner peripheral portion of contact apertures 2.
By the embedded hole 6 that pressure ring 5 can be chimeric with the pars intermedia on the above-below direction of hard tip be 3 in central portion formation.The inner peripheral surface of this embedded hole 6 is formed as the trumpet-shaped inclined plane that top is narrow, below is wide, so that the inclination outer peripheral face close contact of the base portion 3c with contact 3.In addition, the pin thread 5a screwed togather with the negative thread 2a of contact apertures 2 is formed at the peripheral part by pressure ring 5.In addition, owing to by pressure ring 5 being the component screwed togather with the negative thread of the contact apertures 2 of matrix, therefore, the snap-fit element such as wrench face (wrench flat), engaging pin-and-hole for accepting the instruments such as spanner is preferably pre-set at an upper portion thereof.
When hard tip be 3 is fixed to above-mentioned matrix 1, first, hard tip be 3 is embedded the central portion of contact apertures 2, and press pressure ring 5, so that hard tip be 3 is chimeric with embedded hole 6 from top covering.In this case, screw togather by pressure ring 5 negative thread with contact apertures 2, until with hard tip be 3 close contact.In illustrated example, inner peripheral surface due to the embedded hole 6 by pressure ring 5 is formed as the inclined plane with the inclined plane close contact of the base portion of hard tip be 3, therefore, the bottom surface 7 that can not arrive contact apertures 2 by pressure ring 5 of the outer peripheral face close contact of inner peripheral surface and hard tip be, but spatial portion is formed between this bottom surface and the soffit of pressing plate 5.Therefore, contact 3 is pressed by pressing plate 5 and fixes.Especially, in the illustrated example of Fig. 6, Fig. 7, the outer peripheral face of contact 3 is formed as cone shape inclined plane, the inner peripheral surface of pressing plate 5 is formed as the trumpet-shaped inclined plane suitable mutually with the outer peripheral face of contact, therefore, the embedded hole inner peripheral surface of pressing plate 5 and contact outer peripheral face close contact, thus contact firmly can be fixed.
Fig. 3 to Fig. 5 is the figure representing matrix 1, this matrix 1 is manufactured by steel, the upper surface (front end face) with four chip fins (cutting wing) 1a is provided with multiple contact apertures 2 and cinder hole (flushing hole) 8, and is also provided with cinder hole 9 on side.Symbol 20 in figure is for being arranged on the screwed hole cut on vent stem.Fig. 6 illustrates the outward appearance of the drill bit representing the completion status after hard tip be 3 being solidly connected to above-mentioned matrix 1.
In illustrated example, be fixed with the outstanding slightly from the surface of matrix 1 by the upper surface of pressure ring 5 of hard tip be 3, but also can be designed to be in substantially identical face with the surface of matrix 1.After a single use, heat of high temperature when hard tip be will be subject to opening and damaging, therefore, as a rule, drill bit is disposable to the drill bit used due to the opening going out hole milling.Therefore, as the fixing means of hard tip be, as long as contact firmly can be fixed with the degree of resistance to use, not problem in outward appearance etc.
Embodiment 2
Then, Fig. 7, Fig. 8 represent the figure from above-mentioned embodiment different slightly, in this embodiment, are formed with flange 31 at the base portion of hard tip be 3.The external diameter of this flange 31 is substantially identical with the internal diameter of contact apertures 2, and it is highly several millimeters, is screwed with by pressure ring 5 thereon, by the soffit of pressure ring 5 and the upper surface close contact of above-mentioned flange 31.By like this, owing to pressing the flange 31 with hard tip be 3 one with by pressure ring 5, therefore, can make fixing of hard tip be 3 more reliable.
Embodiment 3
Then, Fig. 9, Figure 10 represent the figure from above-mentioned different reference example, in this embodiment, are directly provided with pin thread 14 at the base portion peripheral part of hard tip be 13.This hard tip be 13 is directly screwed togather with the contact apertures 2 being carved with negative thread.That is, hard tip be 13 and matrix 1 are directly threadedly engaged.Although usually parts and base material can be threadedly engaged, because hard tip be is general all very crisp, therefore, screw thread cannot be utilized affixed.But the instrument used due to the opening going out hole milling in most cases uses once just to be lost, and therefore, can adopt the consolidation method of this screw-type.Although also can as mentioned above in hard tip be from forming pin thread with it, owing to being generally difficult to form threaded portion in this hard tip be, therefore, as described in above-described embodiment, ideal in actual use with being undertaken by pressure ring 5 pressing.
As discussed above, according to the fixing means of hard tip be of the present invention, the hard tip be such as superhard contact mechanically firmly can be fixed on the matrix of steel, when the object for high temperature uses, contact is difficult drop-off also.In addition, due to when fixing, contact self can not be subject to thermal shock, therefore, even if the superhard contact of fragility material, also can reliably fix.
Industrial utilizability
In the fixing means of the hard tip be in sintered carbide tools of the present invention, with a wet finger hard tip be firmly can be fixed on the matrix of steel, thus can be used as the contact fixing means of the sintered carbide tools used in the purposes being subject to heat of high temperature.
(symbol description)
1 matrix
2 contact apertures
3 hard tip be
5 press pressure ring
13 hard tip be
31 flanges
Claims (3)
1. a sintered carbide tools, it is characterized in that, hard tip be is embedded in the contact apertures of the band negative thread be located on the matrix of steel, the diameter that the main part of described hard tip be has leading section is little, the inclination outer peripheral face that the diameter of base portion side increases gradually, and be threadedly engaged from the upper side by pressure ring, by pressure ring, described hard tip be pressing is fixed at the bottom of the hole of contact apertures to utilize this, wherein, describedly comprise the through hole inserted for described hard tip be by pressure ring, and there is at peripheral part the pin thread screwed togather with described negative thread, the described through-hole inner surface pressing pressure ring is in the mode of the outer peripheral face close contact with hard tip be, be formed as downside wide, the inclined plane that upside is narrow.
2. the fixing means of a hard tip be, it is characterized in that, the diameter contact apertures larger than the external diameter of hard tip be is provided with in the proper site of the matrix of steel, the inner peripheral portion of this contact apertures forms negative thread, by little for the diameter at main part with leading section, the hard tip be of the inclination outer peripheral face that the diameter of base portion side increases gradually embeds described contact apertures, and described hard tip be is being inserted under the state of the through hole by pressure ring, this negative thread by pressure ring and described contact apertures is screwed togather, so that hard tip be is pressed at the bottom of the hole of contact apertures, the screwed hole by this hard tip be pressing being fixed on matrix is inner, wherein, described pressing ring is formed with through hole, this through hole has the inwall with the inclination outer peripheral face close contact of the main part of described hard tip be, the pin thread screwed togather with the negative thread of described contact apertures is formed at the described peripheral part by pressure ring.
3. the fixing means of hard tip be as claimed in claim 2, is characterized in that, the described through-hole inner surface press pressure ring in the mode of the outer peripheral face close contact with hard tip be, the inclined plane wide on the downside of being formed as, upside is narrow.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2010010996A JP5668909B2 (en) | 2010-01-21 | 2010-01-21 | Carbide tool and hard tip fixing method |
| JP2010-010996 | 2010-01-21 | ||
| PCT/JP2010/059571 WO2011089739A1 (en) | 2010-01-21 | 2010-05-28 | Cemented carbide tool and method of fixing super-hard tip |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103249906A CN103249906A (en) | 2013-08-14 |
| CN103249906B true CN103249906B (en) | 2015-08-12 |
Family
ID=44306558
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201080061997.1A Active CN103249906B (en) | 2010-01-21 | 2010-05-28 | The fixing means of sintered carbide tools and hard tip be |
Country Status (7)
| Country | Link |
|---|---|
| JP (1) | JP5668909B2 (en) |
| KR (1) | KR20130018224A (en) |
| CN (1) | CN103249906B (en) |
| DE (1) | DE112010005170T5 (en) |
| RU (1) | RU2012130947A (en) |
| TW (1) | TWI541428B (en) |
| WO (1) | WO2011089739A1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB201223530D0 (en) | 2012-12-31 | 2013-02-13 | Element Six Abrasives Sa | A cutter element for rock removal applications |
| JP6238432B2 (en) * | 2013-07-22 | 2017-11-29 | 株式会社奥村組 | Cutter board of shield machine and shield machine equipped with the same |
| WO2017115097A1 (en) * | 2015-12-29 | 2017-07-06 | Arcelormittal | Drill bit, tap hole drilling machine equipped with said drill bit, and process for making said drill bit |
| KR102415285B1 (en) | 2020-06-09 | 2022-07-01 | (주)달성 | High Frequency Induction Heating Device for Bit Carbide Tip Brazing |
| KR102503100B1 (en) | 2021-05-13 | 2023-02-24 | (주)달성 | Carbide Tip Welding Method Of Bit Body |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201343994Y (en) * | 2009-01-20 | 2009-11-11 | 中国科学院武汉岩土力学研究所 | Drill bit device for mohole in high tailing dam |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60169385U (en) * | 1984-04-19 | 1985-11-09 | 三菱重工業株式会社 | Button bit for drilling |
| JPH11131962A (en) * | 1997-10-31 | 1999-05-18 | Hashimoto Chuzo Kogyo Kk | Manufacture of bit for drilling |
| JP3772746B2 (en) | 2002-01-21 | 2006-05-10 | 三菱マテリアル株式会社 | Drilling tools |
| US6904983B2 (en) * | 2003-01-30 | 2005-06-14 | Varel International, Ltd. | Low-contact area cutting element |
| JP3915062B2 (en) * | 2005-04-11 | 2007-05-16 | 博 竹崎 | Fixing method of cemented carbide tip in cemented carbide tool |
-
2010
- 2010-01-21 JP JP2010010996A patent/JP5668909B2/en active Active
- 2010-05-28 WO PCT/JP2010/059571 patent/WO2011089739A1/en active Application Filing
- 2010-05-28 DE DE112010005170T patent/DE112010005170T5/en active Pending
- 2010-05-28 KR KR1020127019026A patent/KR20130018224A/en active Search and Examination
- 2010-05-28 CN CN201080061997.1A patent/CN103249906B/en active Active
- 2010-05-28 RU RU2012130947/03A patent/RU2012130947A/en not_active Application Discontinuation
- 2010-12-15 TW TW099143957A patent/TWI541428B/en active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201343994Y (en) * | 2009-01-20 | 2009-11-11 | 中国科学院武汉岩土力学研究所 | Drill bit device for mohole in high tailing dam |
Also Published As
| Publication number | Publication date |
|---|---|
| TWI541428B (en) | 2016-07-11 |
| RU2012130947A (en) | 2014-02-27 |
| WO2011089739A1 (en) | 2011-07-28 |
| KR20130018224A (en) | 2013-02-20 |
| JP2011149192A (en) | 2011-08-04 |
| TW201139834A (en) | 2011-11-16 |
| CN103249906A (en) | 2013-08-14 |
| JP5668909B2 (en) | 2015-02-12 |
| DE112010005170T5 (en) | 2012-10-31 |
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