CN107584159A - A kind of high-intensity welding formula carbide drill - Google Patents
A kind of high-intensity welding formula carbide drill Download PDFInfo
- Publication number
- CN107584159A CN107584159A CN201610529403.4A CN201610529403A CN107584159A CN 107584159 A CN107584159 A CN 107584159A CN 201610529403 A CN201610529403 A CN 201610529403A CN 107584159 A CN107584159 A CN 107584159A
- Authority
- CN
- China
- Prior art keywords
- apopore
- drill
- shoulder
- drill body
- knife
- 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.)
- Pending
Links
- 238000003466 welding Methods 0.000 title claims abstract description 41
- 238000005520 cutting process Methods 0.000 claims abstract description 30
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 12
- 239000000498 cooling water Substances 0.000 claims abstract description 10
- 238000000227 grinding Methods 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 210000000476 body water Anatomy 0.000 claims 1
- 238000001816 cooling Methods 0.000 abstract description 8
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 230000002708 enhancing effect Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 13
- 229910045601 alloy Inorganic materials 0.000 description 12
- 239000000956 alloy Substances 0.000 description 12
- 238000005553 drilling Methods 0.000 description 11
- 238000012545 processing Methods 0.000 description 9
- 239000004411 aluminium Substances 0.000 description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 6
- 229910052782 aluminium Inorganic materials 0.000 description 6
- 229910000838 Al alloy Inorganic materials 0.000 description 5
- 238000005299 abrasion Methods 0.000 description 5
- 238000003754 machining Methods 0.000 description 4
- 230000021615 conjugation Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229910000679 solder Inorganic materials 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 230000007812 deficiency Effects 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 241000579971 Terebridae Species 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 230000033764 rhythmic process Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000007514 turning Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Abstract
The invention discloses a kind of high-intensity welding formula carbide drill, and it includes drill body and is welded in the handle of a knife at its rear portion, and drill body is single piece type integral knife blade；Drill body includes tip, shoulder and the reinforcing portion set gradually, and chip area and cutting edge are provided between tip and shoulder, and chip area is for two and symmetrical in the shape of a spiral around bit central, and the diameter of reinforcing portion is more than the diameter of shoulder；It also includes cooling water hole, cooling water hole includes located at the inlet opening at handle of a knife center and is connected with inlet opening and is located at the apopore one on drill body and apopore two, apopore one is located between cutting edge and shoulder, and the centre position between two chip areas, apopore two are located at the end of chip area.The present invention is welded using single piece type carbide chip, and is provided with cooling water hole so that drill bit intensity greatly enhances, and cooling and chip removal ability enhancing, production efficiency increase, the product quality of production improve, and the service life of drill bit greatly improves.
Description
Technical field
The present invention relates to machining tool technical field, more particularly to a kind of intensity is high, service life is long, production efficiency
Aluminum alloy wheel of vehicle processing bolt hole high-intensity welding formula carbide drill high, the quality of production is good.
Background technology
The machining of aluminum alloy wheel of vehicle generally includes the drilling of cylindrical and the turning of endoporus and bolt hole etc..Bore
Bolt hole generally use is welded hard-alloy bolt drill, and the drill bit is configured to drill body and hard conjunction substantially
Golden welding portion.Drill body is that in general steel add heat treatment, and hard alloy generally use is brazed on drill body.
Specific technique is roughly divided into the cutting forming of material, by Milling Machining blade position, then through Overheating Treatment, hard alloy copper
It is soldered on body, then by grinding-shaping, completes and be made after finally putting the first edge on a knife or a pair of scissors.The drill bit is to process in use
On center, by clamping to the lathe of handle of a knife, by the rotation of machine motor, the rotation for being whirled up drill bit, so as to produce
Raw rotary cutting, the hole of countersink type is drilled out on automotive wheel.In use, can typically be aided with injection coolant to exist
Drill bit and wheel contact site.
Existing drill bit is typically to use three-chip type carbide chip, is soldered on drill body, head tip position is a piece of
Complete fritter hard alloy, then weld each a piece of carbide chip in both sides respectively in cutting shoulder position.Specifically
As shown in accompanying drawing 1 and accompanying drawing 2.Existing welded hard-alloy drill bit, the requirement of general drilling bolt hole can be met substantially,
Size and dimension including drilling out shaping.
The use of existing welded hard-alloy aluminum alloy wheel of vehicle bolt drill, can only be basically reached using result
Caused shape and size, for surface smoothness and precision etc. in process, unstability and precision also be present not
Height, insufficient strength, service life is short and part the deficiencies of processing efficiency is low.Because being the welding of three-chip type hard alloy,
In the presence of inadequate with drill body conjugation, weld is more, the problems such as easily producing weld defect, so can cause the body of drill bit
Fallen off with hard alloy or collapse broken bad result.Because solder bond face is more, therefore the rigidity of solid drill can be caused
It is not good enough with stability, in actual drilling process, it may occur that the knife mark that such as shakes, rough, brightless and dimension overproof is unstable
Phenomena such as.It is continuous processing uninterrupted for a long time, for being produced in process further, since during actual use bit bore
Heat, if can not quickly cool down, can directly result in drill bit service life reduce and Wheel drilling size and finish
There is deviation and defect.
So for above mentioned problem and defect, just directly result in the bad and cutter of processing use cost occur to rise and
The latent consequences of waste.
The content of the invention
The present invention is directed to above-mentioned the deficiencies in the prior art, there is provided a kind of aluminum alloy wheel of vehicle processing bolt hole is with high-strength
Welded hard-alloy drill bit is spent, it is welded using single piece type carbide chip, the increase of firm welding degree, will not produce welding
Come off and the problem of tipping, make during drill bit use will not scrap and defective products, while abrasion and extension can also be reduced make
With the life-span, use cost is saved.And cooling water hole is provided with, and in drilling process, because having good cooling and chip removal,
Lifting for cutting speed has larger help, can use larger feeding and cutting speed, effective improving production efficiency
And rhythm.After being lifted for bulk strength, service life compares normal drill bit, can about improve more than 50%.Cost performance is had
Effect improvement.
To solve problems of the prior art, the concrete technical scheme that the present invention uses is：
A kind of high-intensity welding formula carbide drill, it includes the drill body provided with carbide chip and is welded in described
The handle of a knife at drill body rear portion.The drill body is single piece type integral knife blade；The drill body includes the point set gradually
Portion, shoulder and reinforcing portion, are provided with chip area and cutting edge between the tip and shoulder, the chip area is two and around drill bit
Center line is symmetrical in the shape of a spiral, and the diameter of the reinforcing portion is more than the diameter of shoulder；It also includes cooling water hole, described cold
But water hole includes located at the inlet opening at handle of a knife center and is connected with inlet opening and is located at apopore one and water outlet on drill body
Hole two, the apopore one are located between cutting edge and shoulder, and the centre position between two chip areas, the water outlet
Hole two is located at the end of chip area.
Preferable scheme, the welding manner between the drill body and handle of a knife weld for U-shaped.
Further preferred scheme, the apopore one and apopore two are two, and two apopores one and two
Apopore two is separated by 180 ° and is symmetrical arranged.
Scheme still more preferably, 13 ° of the helical angle ＜ of the chip area.
Scheme still further preferably, the shoulder of the drill body from cutting edge position of tool tip toward handle of a knife locality on
Provided with reversed cone angle grinding surface.
The back draught of the reversed cone angle grinding surface is 0.1 °.
The diameter of the reinforcing portion is 0.1~0.2 times of bit cutting diameter.
By using such scheme, a kind of high-intensity welding formula carbide drill of the invention compared with prior art,
It has technical effect that：
1st, the present invention is welded using single piece type carbide chip, strengthens overall rigidity and intensity.In the drill bit system of reality
Make in technique, uniqueness is welded using one chip blade, makes the contact surface of welding position neat, and reduces solder side, makes weldering
The right high, firm welding of binding.Using the drill bit of overall one chip blade, the precision that can be effectively accomplished workpiece size will
Ask, also can guarantee that the problem of its stability will not deviate with the extension of process time.Use for solid drill
Caused abrasion can also reduce therewith, improve the service life of drill bit indirectly.
2nd, more traditional V is compared using more unique U-shaped welding manner, U-shaped welding groove between drill body and handle of a knife
Type groove is welded, and is had more preferable contact surface and firm welding degree, is improved the conjugation and welding precision of welding.
3rd, the present invention is portalled provided with four cooling waters, and cooling water gets delivery port from two different parts of drill bit, two
Apopore one is located at blade end, and two apopores two are located at the end of chip area, can effectively in drawbore process,
Play a part of cooling down drill bit and help chip removal.Wherein, heat caused by cutting edge obtains preferably after apopore one can make cutting
Cooling, while caused aluminium skimmings flush out outward and upwards from bottom after can making cutting.Apopore two is in working angles
The cooling of cutter hub is assisted, while can effectively help to cut caused aluminium skimmings discharge.
4th, the chip area of drill bit is designed and fabricated, spiral of 20~40 degree compared in general drill bit using low pitch angle
Angle, drill bit can be made in high-speed cutting processing, caused aluminium skimmings can more effectively discharge and go out bits, while improve drilling metapore
The surface smoothness of wall, improve the quality of production product.
5th, the shoulder of drill body is provided with reversed cone angle grinding surface from cutting edge position of tool tip toward handle of a knife locality, and it subtracts
It is small it is long-term use of after caused blade abrasion it is uneven caused by size the problem of deviateing.
6th, the reinforcing portion of external diameter increase is provided with drill body with handle of a knife junction, which increases drill bit in contact drilling car
The ability of drag caused by being resisted during wheel, the overall intensity of drill bit is not only increased, and the size for improving drilling processing is steady
It is qualitative, the service life of Cutter bits is also improved, so as to improve cost performance.
7th, using structure design of the present invention and the drill bit of manufacture, after firm welding degree increase, will not produce welding come off and
The problem of tipping, make to scrap during drill bit use and produce defective products, while abrasion can also be reduced and extended and use the longevity
Life.Save use cost.In drilling process, because having good cooling and chip removal, the lifting for cutting speed,
There is larger help, larger feeding and cutting speed can be used, the shortening for the process time plays a decisive role, because
This, production efficiency greatly improves.After being lifted for bulk strength, service life compares normal drill bit, can about improve 50% with
On.Cost performance is effectively improved.
Brief description of the drawings
Fig. 1 is the overall structure diagram of common welded hard-alloy drill bit in the prior art；
Fig. 2 is the structural representation of the hard alloy welding portion of common welded hard-alloy drill bit in the prior art；
Fig. 3 is a kind of overall structure diagram of high-intensity welding formula carbide drill of the present invention；
Fig. 4 is a kind of setting schematic diagram in the drill body upper water-out hole of high-intensity welding formula carbide drill of the present invention.
Embodiment
To make the object, technical solutions and advantages of the present invention of greater clarity, with reference to instantiation and with reference to attached
Figure, the present invention is described in more detail.It should be understood that these descriptions are merely illustrative, and it is not intended to limit the present invention's
Scope.In addition, in the following description, the description to known features and technology is eliminated, to avoid unnecessarily obscuring the present invention
Concept.
As shown in Figure 3 and Figure 4, a kind of high-intensity welding formula carbide drill, it is effectively directed to what need to be solved at present
Solve, drill bit is reached high intensity and high-performance, while lift cost performance.And then meet manufacturer for aluminium alloy car car
Take turns the processing request of auger shell keyhole.
A kind of high-intensity welding formula carbide drill, it includes drill body 1 and welding provided with carbide chip
Handle of a knife 2 in the rear portion of drill body 1.
Welding manner between the drill body 1 and handle of a knife 2 is U-shaped welding, and U-shaped welding groove compares V-groove, has more
Good contact surface and firm welding degree ensure that the firm and precision of welding.
The drill body 1 is single piece type integral knife blade, and it reinforces the rigidity and intensity of entirety.In the drill bit system of reality
Make in technique, uniqueness is welded using one chip blade, makes the contact surface of welding position neat, and reduces solder side, can
Obtain the high firm welding degree of conjugation.Meanwhile for the use of overall one chip blade, the essence of size can be effectively accomplished
Degree requires, also can guarantee that the problem of its stability will not deviate with long processing time.Use for solid drill
Caused abrasion can also reduce therewith, lift service life indirectly.
The drill body 1 includes tip 11, shoulder 12 and the reinforcing portion 13 set gradually, the tip 11 and shoulder 12
Between be provided with chip area 14 and cutting edge 15, the chip area 14 is two and symmetrical in the shape of a spiral around center line of bit,
13 ° of the helical angle ＜ of the chip area 14.The chip area 14 of drill bit is designed and fabricated using low pitch angle, is in order in height
In fast machining, bits can more effectively be discharged and gone out to caused aluminium skimmings.The helical angle that in general drill bit uses is about 20~40
Degree.
It is 0.1 ° that the shoulder 12 of the drill body 1 is provided with back draught from the position of tool tip of cutting edge 15 toward the locality of handle of a knife 2
Reversed cone angle grinding surface 16, i.e., diameter of the reversed cone angle grinding surface 16 at cutting edge 15 be more than close to the position of handle of a knife 2 diameter.
This wears away the problem of inequality causes size to deviate to reduce generation blade after long-term use.
The diameter of the reinforcing portion 13 is 0.1~0.2 times of bit cutting diameter.The setting of reinforcing portion 13 is bored for enhancing
Head is resisted in drag caused by contact drilling wheel, the overall intensity of increase drill bit.
The present invention is additionally provided with cooling water hole 3 in drill bit internal, and the cooling water hole 3 includes the water inlet located at the center of handle of a knife 2
Hole 31 and it is connected with inlet opening 31 and apopore 1 and apopore 2 33 on the drill body, the apopore 1 are set
Between cutting edge 15 and shoulder 12, and the centre position between two chip areas 14, the apopore 2 33 is located at row
Consider the end of groove 14 to be worth doing.The apopore 1 and apopore 2 33 are two, and two apopores 1 and two apopores
2 33, which are separated by 180 °, is symmetrical arranged.Apopore can play cooling drill bit and help arranged effectively in drawbore process
The effect of bits.Wherein, heat caused by cutting edge is preferably cooled down after apopore 1 can make cutting, while can make cutting
Caused aluminium skimmings flush out outward and upwards from bottom afterwards.Apopore 2 33 is the cooling that cutter hub is assisted in working angles, together
When can effectively help to cut caused by aluminium skimmings discharge.
The foregoing is merely illustrative of the preferred embodiments of the present invention, the protection domain being not intended to limit the invention, it is all
Within the spirit and principles in the present invention, any modification for being made, equivalent substitution, it is all contained within protection scope of the present invention.
Claims (7)
1. a kind of high-intensity welding formula carbide drill, it includes the drill body provided with carbide chip and is welded in institute
State the handle of a knife at drill body rear portion, it is characterised in that：The drill body is single piece type integral knife blade；The drill body includes
Tip, shoulder and the reinforcing portion set gradually, is provided with chip area and cutting edge between the tip and shoulder, the chip area is
Two and symmetrical in the shape of a spiral around center line of bit, the diameter of the reinforcing portion is more than the diameter of shoulder；It also includes cold
But water hole, the cooling water hole include located at the inlet opening at handle of a knife center and are connected with inlet opening and are located at going out on drill body
Water hole one and apopore two, the apopore one are located between cutting edge and shoulder, and the centre between two chip areas
Position, the apopore two are located at the end of chip area.
A kind of 2. high-intensity welding formula carbide drill according to claim 1, it is characterised in that：The drill body
Welding manner between handle of a knife welds for U-shaped.
A kind of 3. high-intensity welding formula carbide drill according to claim 1, it is characterised in that：The apopore one
It it is two with apopore two, and two apopores one and two apopores two are separated by 180 ° and are symmetrical arranged.
A kind of 4. high-intensity welding formula carbide drill according to claim 1, it is characterised in that：The chip area
13 ° of helical angle ＜.
A kind of 5. high-intensity welding formula carbide drill according to claim 1, it is characterised in that：The drill body
Shoulder be provided with reversed cone angle grinding surface from cutting edge position of tool tip toward handle of a knife locality.
A kind of 6. high-intensity welding formula carbide drill according to claim 5, it is characterised in that：The reversed cone angle mill
The back draught of bevel is 0.1 °.
A kind of 7. high-intensity welding formula carbide drill according to claim 1, it is characterised in that：The reinforcing portion
Diameter is 0.1~0.2 times of bit cutting diameter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610529403.4A CN107584159A (en) | 2016-07-07 | 2016-07-07 | A kind of high-intensity welding formula carbide drill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610529403.4A CN107584159A (en) | 2016-07-07 | 2016-07-07 | A kind of high-intensity welding formula carbide drill |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107584159A true CN107584159A (en) | 2018-01-16 |
Family
ID=61046218
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610529403.4A Pending CN107584159A (en) | 2016-07-07 | 2016-07-07 | A kind of high-intensity welding formula carbide drill |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107584159A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108656263A (en) * | 2018-05-11 | 2018-10-16 | 方大控股有限公司 | A kind of novel alloy drill bit |
| CN110394484A (en) * | 2019-08-13 | 2019-11-01 | 厦门厦芝科技工具有限公司 | A kind of three apex angular bit heads |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1190917A (en) * | 1995-07-14 | 1998-08-19 | 克纳门特尔-赫特尔刀具及硬质材料股份有限公司 | Drill with cooling-lubricant channel |
| JP2003285214A (en) * | 2002-03-27 | 2003-10-07 | Mitsubishi Materials Corp | Drill |
| CN2715896Y (en) * | 2004-07-22 | 2005-08-10 | 天鹰精密工具(番禺)有限公司 | Drill bit |
| CN201505751U (en) * | 2009-08-31 | 2010-06-16 | 钱银光 | Tipped bit |
| CN104070207A (en) * | 2014-06-20 | 2014-10-01 | 乐山斯堪纳机械制造有限公司 | Drill bit and method for processing deep hole of shaft type product |
| CN104338981A (en) * | 2013-07-31 | 2015-02-11 | 常州耐尔特精密工具有限公司 | Welding type inner-cooling drill |
| DE102014109344A1 (en) * | 2013-09-12 | 2015-03-12 | Gühring KG | Multi-bladed rotary drivable cutting tool |
| CN205949933U (en) * | 2016-07-07 | 2017-02-15 | 昆山捷鑫辰精密工业刀具有限公司 | High strength welding formula hard alloy drill bit |
-
2016
- 2016-07-07 CN CN201610529403.4A patent/CN107584159A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1190917A (en) * | 1995-07-14 | 1998-08-19 | 克纳门特尔-赫特尔刀具及硬质材料股份有限公司 | Drill with cooling-lubricant channel |
| JP2003285214A (en) * | 2002-03-27 | 2003-10-07 | Mitsubishi Materials Corp | Drill |
| CN2715896Y (en) * | 2004-07-22 | 2005-08-10 | 天鹰精密工具(番禺)有限公司 | Drill bit |
| CN201505751U (en) * | 2009-08-31 | 2010-06-16 | 钱银光 | Tipped bit |
| CN104338981A (en) * | 2013-07-31 | 2015-02-11 | 常州耐尔特精密工具有限公司 | Welding type inner-cooling drill |
| DE102014109344A1 (en) * | 2013-09-12 | 2015-03-12 | Gühring KG | Multi-bladed rotary drivable cutting tool |
| CN104070207A (en) * | 2014-06-20 | 2014-10-01 | 乐山斯堪纳机械制造有限公司 | Drill bit and method for processing deep hole of shaft type product |
| CN205949933U (en) * | 2016-07-07 | 2017-02-15 | 昆山捷鑫辰精密工业刀具有限公司 | High strength welding formula hard alloy drill bit |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108656263A (en) * | 2018-05-11 | 2018-10-16 | 方大控股有限公司 | A kind of novel alloy drill bit |
| CN110394484A (en) * | 2019-08-13 | 2019-11-01 | 厦门厦芝科技工具有限公司 | A kind of three apex angular bit heads |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP1925386B1 (en) | Drill bit with high performance for chip removal | |
| CN108098255A (en) | A kind of TA15 titanium alloys frame class parts machining process | |
| CN107584159A (en) | A kind of high-intensity welding formula carbide drill | |
| CN205949933U (en) | High strength welding formula hard alloy drill bit | |
| CN106001648A (en) | Turning/milling blade for machining dead-hard steel special-shaped part | |
| CN206065512U (en) | A kind of helical deep hole annular groove knife | |
| CN211564642U (en) | Heavy truck air chamber pipe orifice corrugation forming milling cutter | |
| CN204770746U (en) | Multipurpose motorcycle drive gear processing vehicle blade | |
| CN209349626U (en) | A kind of carbide rotary tool cutter for processing high-speed rail industry titanium alloy | |
| CN206925368U (en) | One kind processing casting wooden model special hollow end mill(ing) cutter | |
| CN108748735B (en) | Self-cooling cutter wheel for stone machining and manufacturing method thereof | |
| CN203401119U (en) | High-strength highly-durable drill | |
| CN203711944U (en) | Durable drill | |
| CN209812790U (en) | L groove cement bores | |
| CN207710013U (en) | A kind of PCD reamers | |
| CN206366690U (en) | A kind of diamond slotting cutter | |
| CN104439432A (en) | J-shaped seamed edge correction auger bit | |
| CN201783682U (en) | Drill bit for drilling large length-diameter ratio deep holes | |
| CN206492963U (en) | A kind of double end centre drill | |
| CN204295018U (en) | J type seamed edge correction spiral bit | |
| CN104400079A (en) | Twist bit for carburizing steel | |
| CN206286613U (en) | A kind of crown-shaped Multifunctional drills of W | |
| CN204221057U (en) | J type seamed edge correction straight fluted drill | |
| CN205733183U (en) | A kind of high strength cemented carbide milling cutter of band chip-breaker | |
| CN214108931U (en) | Combined type twist drill |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |