CN107716963A - A kind of two-way chamfering tool - Google Patents
A kind of two-way chamfering tool Download PDFInfo
- Publication number
- CN107716963A CN107716963A CN201711165255.3A CN201711165255A CN107716963A CN 107716963 A CN107716963 A CN 107716963A CN 201711165255 A CN201711165255 A CN 201711165255A CN 107716963 A CN107716963 A CN 107716963A
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- China
- Prior art keywords
- cutter hub
- chamfering
- way
- square opening
- way chamfering
- Prior art date
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- 238000005520 cutting process Methods 0.000 claims abstract description 17
- 238000003825 pressing Methods 0.000 claims abstract description 7
- 238000005553 drilling Methods 0.000 claims description 14
- 230000006835 compression Effects 0.000 claims description 9
- 238000007906 compression Methods 0.000 claims description 9
- BGOFCVIGEYGEOF-UJPOAAIJSA-N helicin Chemical compound O[C@@H]1[C@@H](O)[C@H](O)[C@@H](CO)O[C@H]1OC1=CC=CC=C1C=O BGOFCVIGEYGEOF-UJPOAAIJSA-N 0.000 claims description 3
- 230000007704 transition Effects 0.000 claims description 3
- 230000004048 modification Effects 0.000 description 12
- 238000012986 modification Methods 0.000 description 12
- 230000008901 benefit Effects 0.000 description 11
- 230000008859 change Effects 0.000 description 9
- 238000000034 method Methods 0.000 description 8
- 238000012545 processing Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000009434 installation Methods 0.000 description 3
- 230000007306 turnover Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000006748 scratching Methods 0.000 description 2
- 230000002393 scratching effect Effects 0.000 description 2
- 241000220317 Rosa Species 0.000 description 1
- 229910000639 Spring steel Inorganic materials 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 1
- 238000011160 research Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B27/00—Tools for turning or boring machines; Tools of a similar kind in general; Accessories therefor
- B23B27/14—Cutting tools of which the bits or tips or cutting inserts are of special material
- B23B27/16—Cutting tools of which the bits or tips or cutting inserts are of special material with exchangeable cutting bits or cutting inserts, e.g. able to be clamped
- B23B27/1614—Cutting tools of which the bits or tips or cutting inserts are of special material with exchangeable cutting bits or cutting inserts, e.g. able to be clamped with plate-like cutting inserts of special shape clamped against the walls of the recess in the shank by a clamping member acting upon the wall of a hole in the insert
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2205/00—Fixation of cutting inserts in holders
- B23B2205/02—Fixation using an elastically deformable clamping member
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Processing Of Stones Or Stones Resemblance Materials (AREA)
Abstract
The invention discloses a kind of two-way chamfering tool, including：Cutter hub, its front end predeterminated position are provided with a square opening opened up on cutter hub length direction, and one end of the square opening is removably connected with a fixture；Two-way chamfering blade, its connection end is connected by the governor motion of an adjustable elastic power and then with fixture, cutting edge end is arranged in the square opening of cutter hub by being arranged on the pressing plate of the square opening other end, and the cutting edge of the chamfering blade is protruded from the preset height of cutter hub surface one.The present invention provides a kind of two-way chamfering tool, it can realize the elastic force regulation of chamfering tool by adjustable governor motion, and then cause it when being pressed into cutter hub, its pressure adjustable, therefore while two-way chamfering is realized, it is ensured that its chamfering angle size can need to be adjusted according to the use of reality, and operability is stronger, better adaptability, stability are controllable.
Description
Technical field
The present invention relates to a kind of cutter used in the case of tool processes.It is more particularly related to a kind of use
Two-way chamfering tool in the case of Drilling operation.
Background technology
In the case of present Drilling operation, the required precision in hole should be reached, require the quality of hole wall again, if desired
Chamfering making is carried out on the two sides in aperture, its common processing mode is first bore hole, then positive surface chamfer, then by workpiece turn-over
Another side angle again；Or with boring cutter (gang tool of bore hole and positive surface chamfer) is combined, by one work of bore hole and positive surface chamfer
Sequence is completed, then the turn-over chamfering of falling opposite side；Both the above processing mode, the cutter used are all two.
And the major defect of current two schemes is：First, cost is high, both the above processing mode, the cutter used is three
Or two, number of cutters is more；Second, efficiency is low, two kinds of processing modes, process bore hole and positive surface chamfer afterwards will
By workpiece turn-over, reverse side chamfering is then reprocessed, adds the man-hour of clamping again, and add tool change time, be not suitable for
Mass production.
Also have and chamfering blade is assembled on hole boring cutter, as patent document is entitled：Suitable for bore hole and two sides aperture
The gang tool of chamfering, its by setting the mounting groove parallel with its length direction in the side wall of hole boring cutter, then with spring steel
Cooperation, by the power applied in boring procedure middle hole wall, chamfering blade is pressed into mounting groove, with chamfering blade under
After the completion of surface chamfer, hole can be passed through, then carries out reverse side chamfering, so that it does not have to change the i.e. achievable Double-side rounding of cutter,
Have a disadvantage in that, to ensure that it smoothly completes chamfering operation, therefore its elastic stiffness must reach specification requirement, and rigidity is too
It is small, the chamfering operation of nominal amount can not be completed, too greatly, it is had no idea under rated pressure in retraction mounting groove, and
The quality of drilling is influenceed, and after installation, its elastic stiffness is non-adjustable, can not adapt to the need of different chamfering angle sizes
Will, can only be by changing chamfering tool to realize in the case where needing different size of chamfering, adaptability is not strong.
The content of the invention
It is an object of the invention to solve at least the above and/or defect, and provide at least will be described later it is excellent
Point.
It is a still further object of the present invention to provide a kind of two-way chamfering tool, and it can be real by adjustable governor motion
The elastic force regulation of existing chamfering tool, and then cause it when being pressed into cutter hub, its pressure adjustable, therefore realizing two-way chamfering
While, it is ensured that its chamfering angle size can need to be adjusted according to the use of reality, and operability is stronger, better adaptability, surely
It is qualitative controllable.
In order to realize according to object of the present invention and further advantage, there is provided a kind of two-way chamfering tool, including：
Cutter hub, its front end predeterminated position is provided with a square opening opened up on cutter hub length direction, described square
The one end in hole is removably connected with a fixture；
Two-way chamfering blade, its connection end are connected and then with fixture by the governor motion of an adjustable elastic power, cut
Cut sword end to be arranged in the square opening of cutter hub by being arranged on the pressing plate of the square opening other end, and make the chamfering blade
Cutting edge protrudes from the preset height of cutter hub surface one, with during chamfering, by hole wall extrude two-way chamfering blade with
It is passed to drill, completes the two-way chamfering operation in hole to be processed.
Preferably, wherein, the fixture includes a cover plate, and the cover plate is fixed on by the screw being engaged
On cutter hub.
Preferably, wherein, the governor motion includes：
At least two flexible members affixed with cutter hub connection end；
The adjusting screw being engaged with cover plate；
Wherein, the other end of each flexible member is connected on a supporting plate that can be movable in square opening, Jin Ertong
Screw is overregulated to be connected with cover plate.
Preferably, wherein, the flexible member is configured to compress spring
Preferably, wherein, the outside of the compression spring is arranged with the guiding group being oriented to its compression direction
Part, the guidance set are configured as expansion link.
Preferably, wherein, the forward and backward both ends of the two-way chamfering blade are respectively provided with to be engaged with chamfer angle to be processed
Cutting edge；
Wherein, between the cutting edge by a curved portions and then transition, and the circular arc of the curved portions is configured as being less than
It is processed the radius in hole.
Preferably, wherein, the cutter hub has in the one end coordinated with cover plate to accommodate the deep gouge of cover plate, and described
Cutter hub has the circular hole that at least two pairs of flexible members are defined in the one end being engaged with cover plate, and the circular hole is square
Hole run through after on cutter hub form corresponding to semicircle cavity.
Preferably, wherein, the air-vent that the square opening is in communication with the outside is provided with the cutter hub.
Preferably, wherein, the air-vent is configured as parallel with the length direction of cutter hub and longitudinal positioned at cutter hub
On center line.
Preferably, wherein, the front end of the cutter hub is provided with for completing the cutter head of drilling, and is set on the cutter hub
There is at least one spiral helicine chip area.
The present invention comprises at least following beneficial effect：First, the present invention realizes rose reamer by adjustable governor motion
The elastic force regulation of tool, and then cause it when being pressed into cutter hub, its pressure adjustable, therefore while two-way chamfering is realized,
Ensure that its chamfering angle size can need to be adjusted according to the use of reality, operability is stronger, and better adaptability, stability can
Control.
Second, the chamfer angle and cutting edge of workpiece needs are machined with before and after the chamfering blade of the present invention, and a circle is arranged at top
Arc, less than the radius in processed hole, slip that can be smooth after blade access aperture is without scratching hole wall.
Third, the present invention can also pass through more allowing blade replacement, it is possible to achieve a kind of processing of a variety of chamferings of cutter.
Further advantage, target and the feature of the present invention embodies part by following explanation, and part will also be by this
The research and practice of invention and be understood by the person skilled in the art.
Brief description of the drawings
Fig. 1 is the structural representation of two-way chamfering tool in one embodiment of the present of invention；
Fig. 2 be Fig. 1 in F to structural representation；
Fig. 3 be Fig. 1 in M to structural representation.
Embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings, to make those skilled in the art with reference to specification text
Word can be implemented according to this.
It should be appreciated that such as " having ", "comprising" and " comprising " term used herein do not allot one or more
The presence or addition of individual other elements or its combination.
Fig. 1-3 shown according to a kind of way of realization of two-way chamfering tool of the present invention, including：
Cutter hub 1, its front end predeterminated position are provided with a square opening 2 opened up on cutter hub length direction, the side
The one end in shape hole is removably connected with a fixture 3；
Two-way chamfering blade 4, for carrying out chamfering operation simultaneously to positive and negative during hole machined；Its connection end passes through
The governor motion 5 of one adjustable elastic power and then it is connected with fixture, it is used to provide an active force to two-way chamfering blade, makes
Two-way chamfering blade protrudes from cutter hub portion, by the active force of extruding, so that it can be along predetermined direction to square opening contract
Preset distance, so that by drilling, cutting edge end is arranged on the side of cutter hub by being arranged on the pressing plate 11 of the square opening other end
In shape hole, the pressing plate is by screw 12 and then fixed and make the cutting edge of the chamfering blade to protrude from cutter hub surface one pre-
If height, with during chamfering, complete positive, reflection chamfering operation, two-way chamfering blade is extruded by hole wall so that
It completes the two-way chamfering operation in hole to be processed by drilling.There is one to be used to blade be installed on cutter hub using this scheme
There is a movable spring pedestal square hole, square hole bottom and adjusts the screw of spring force, and the square hole back side has a back shroud to cover,
There is a small sircle hole at back shroud center, and spanner can change the elastic force of spring by small sircle hole twist screws；Square hole opening has one
Pressing plate, on the cutter hub that pressing plate is installed with a screw, one is pressed on the shoulder of blade, by cutter head, reverse side chamfering cutter head, just
Surface chamfer blade unit is used for one cutter, reduces number of cutters, the use of cutter holder also protects cutter hub, after cutter holder damage
Only need to change cutter holder, it is cost-effective；One process disposably completes the positive and negative while chamfering in hole, improves production effect
Rate；This process structure and mentality of designing have been saved man-hour, improve production efficiency；One cutter simultaneously, can by adjusting elastic force
Realize the processing of different chamfering angle sizes, and reduce production cost, have can implementation result it is good, workable, strong adaptability,
Cost is controllable, and production efficiency is high, the good benefit of the structural stability of product.Also, this mode is a kind of preferably real
The explanation of example, but be not limited thereto.When implementing of the invention, can be carried out according to user's demand appropriate replacement and/or
Modification.
As shown in figure 1, in another example, the fixture includes a cover plate 6, and it is used to enter two-way chamfering blade
Row encapsulation is fixed, and the cover plate is fixed on cutter hub by the screw 7 being engaged, and it is used for the education in needs to two-way
Chamfering blade is replaced.More allowing blade replacement is passed through using this scheme, it is possible to achieve a kind of processing of a variety of chamferings of cutter, have
Strong adaptability, stability is good, workable benefit.Also, this mode is a kind of explanation of preferred embodiments, but
It is not limited thereto.When implementing of the invention, appropriate replacement and/or modification can be carried out according to user's demand.
As shown in figure 1, in another example, the governor motion includes：
At least two flexible members 8 affixed with cutter hub connection end, it is used to be defined two-way chamfering blade, simultaneously
One elasticity is supplied to, so that it is coordinated with two-way chamfering blade, realizes the operation to chamfering, and in the continuous of hole wall
Under extruding, two-way chamfering blade is received to square opening, so that two-way chamfering blade can be smoothly through drilling；
The adjusting screw 9 being engaged with cover plate, it is used to adjust between two-way chamfering blade and cover plate by adjusting screw
Distance, while the length of compression elastic element, to reach the effect of regulation elasticity power；
Wherein, the other end of each flexible member is connected on a supporting plate 10 that can be movable in square opening, its
The flexible member mounting seat of activity setting can be counted as, and then is connected by adjusting screw with cover plate.Using this
Scheme can change have compressed for spring by turning adjusting screw, so as to change the elastic force of spring, therefore change chamfering
Operating pressure during blade chamfering, change the size of chamfering.With simple in construction, strong operability, stability it is good it is favourable it
Place.Also, this mode is a kind of explanation of preferred embodiments, but is not limited thereto., can basis when implementing of the invention
User's demand carries out appropriate replacement and/or modification.
In another example, the flexible member is configured to compress spring.The present invention uses this scheme by elasticity
Element is arranged to compression spring, and it is when implementing, it is only necessary to changes its length by application effect and can be achieved with elastic force
Change, simple with interactive construction, cost is controllable, beneficial to the benefit safeguarded and changed.Also, this mode is one kind
The explanation of preferred embodiments, but be not limited thereto.When implementing of the invention, appropriate replacement can be carried out according to user's demand
And/or modification.
In another example, the outside of the compression spring is arranged with the guiding group being oriented to its compression direction
Part, the guidance set are configured as expansion link (not shown).Its track in the process of running is carried out using this scheme
Limit and be oriented to so that it when changing its length, its position will not shift, and then so that its at work with cutter hub side wall
Interfere, influence the stability of its work, have can implementation result it is good, workable, the good benefit of stability.And
And this mode is a kind of explanation of preferred embodiments, but it is not limited thereto., can be according to use when implementing of the invention
Person's demand carries out appropriate replacement and/or modification.
As shown in figure 1, in another example, the forward and backward both ends of the two-way chamfering blade be respectively provided with it is to be processed fall
The cutting edge that angle angle is engaged, it is used for the needs for adapting to different chamfering angles；
Wherein, between the cutting edge by a curved portions 13 and then transition, it is used for by matching with two-way chamfering blade
Close, so that it can be shunk along predetermined direction, while passing through drilling, scuffing etc. will not be caused to influence on hole wall, shadow
Hole wall quality is rung, and the circular arc of the curved portions is configured as being less than the radius for being processed hole, two-way chamfering blade is front and rear to be processed
There are the chamfer angle and cutting edge that workpiece needs, there is a circular arc at top, less than the radius in processed hole, can put down after blade access aperture
Sliding slip is without scratching hole wall.Using this scheme have can implementation result it is good, the strong benefit of product quality stability.
Also, this mode is a kind of explanation of preferred embodiments, but is not limited thereto., can be according to making when implementing of the invention
User's demand carries out appropriate replacement and/or modification.
As shown in showing Fig. 3, in another example, the cutter hub has in the one end coordinated with cover plate to accommodate cover plate
Deep gouge 15, by setting the deep gouge to be cooperated with cover plate on tool rest, to provide chamfering blade corresponding installation position, with suitable
Chamfering requirements of one's work are answered, and the cutter hub in the one end being engaged with cover plate there are at least two pairs of flexible members to be defined
Circular hole 16, to ensure that circular hole described in the stability after its installation and in work is formed on cutter hub after being run through by square opening
Corresponding semicircle cavity 18, by the way that the width of square opening to be set smaller than to the diameter of circular hole, it is being exactly apparently two
Limited spring semicircle orifice so that its assembling stability it is more preferable, using this scheme have can implementation result it is good, operability
By force, the good benefit of adaptability.Also, this mode is a kind of explanation of preferred embodiments, but is not limited thereto.Implementing
When of the invention, appropriate replacement and/or modification can be carried out according to user's demand.
As shown in figure 1, in another example, it is provided with the cutter hub and is breathed freely what the square opening was in communication with the outside
Hole 17.This scheme is used to cause it in compression spring, during passing through drilling, its interior compressed air can arrange in real time
Go out, to prevent spring from being deformed upon in the presence of air pressure, influence in its process, the running orbit of cutter, influence
The crudy of product and the life-span of product, good with stability, exploitativeness is strong, the benefit of steady quality.Also, this
Kind mode is a kind of explanation of preferred embodiments, but is not limited thereto., can be according to user's demand when implementing of the invention
Carry out appropriate replacement and/or modification.
In another example, the air-vent is configured as parallel with the length direction of cutter hub and longitudinal positioned at cutter hub
Center line on.This scheme is used to cause its exhaust rapid, and meets the usual working specification in drilling operation, having can
Implementation result is good, workable, the good benefit of stability.Also, this mode is a kind of explanation of preferred embodiments,
But it is not limited thereto.When implementing of the invention, appropriate replacement and/or modification can be carried out according to user's demand.
In another example, the front end of the cutter hub is provided with the cutter head (not shown) for completing drilling, and it is used for
Boring operation is carried out in operation, completes hole machined；
And at least one spiral helicine chip area (not shown) is provided with the cutter hub, it can also be according to being actually needed
Cooling bath (not shown) is set, to adapt to different processing duration needs.Drilling and chamfering operation, tool are realized using this scheme
Have can implementation result it is good, workable, the good benefit of adaptability.Also, this mode is a kind of preferred embodiments
Illustrate, but be not limited thereto.When implementing of the invention, appropriate replacement and/or modification can be carried out according to user's demand.
The present invention workflow be：Cutter is rotated into hole, the preceding chamfering cutting edge contact hole mouth of chamfering blade, starts
Chamfering, with the entrance of cutter, chamfering area is increasing, and the pressure that blade is subject to is also bigger, when radial pressure is more than spring
Elastic force is that blade is pressed into square hole, no longer chamfering.After cutter stretches out aperture, the pressure that blade is subject to reduces, in spring force
In the presence of stretch out square hole.Cutter reversely rotates withdrawing, the rear chamfering cutting edge contact hole mouth of chamfering blade, starts chamfering, with
The entrance of cutter, chamfering area is increasing, and the pressure that blade is subject to is also bigger, when radial pressure is more than spring force,
Blade is pressed into square hole, no longer chamfering, until cutter exits processed hole completely.Chamfering blade is real by hole wall in its operating process
Now it is pressed into and exits, the big I of its chamfering is realized by adjusting spring force, and the positive and negative that can disposably complete hole falls
Angle, adaptable strong, the good effect of stability.
Number of devices and treatment scale described herein are the explanations for simplifying the present invention.To the present invention it is two-way fall
The application of angle cutter, modifications and variations will be readily apparent to persons skilled in the art.
Although embodiment of the present invention is disclosed as above, it is not restricted in specification and embodiment listed
With.It can be applied to various suitable the field of the invention completely., can be easily for those skilled in the art
Realize other modification.Therefore it is of the invention and unlimited under the universal limited without departing substantially from claim and equivalency range
In specific details and shown here as the legend with description.
Claims (10)
- A kind of 1. two-way chamfering tool, it is characterised in that including：Cutter hub, its front end predeterminated position are provided with a square opening opened up on cutter hub length direction, the square opening One end is removably connected with a fixture；Two-way chamfering blade, its connection end are connected by the governor motion of an adjustable elastic power and then with fixture, cutting edge End is arranged in the square opening of cutter hub by being arranged on the pressing plate of the square opening other end, and makes the cutting of the chamfering blade Sword protrudes from the preset height of cutter hub surface one, so that during chamfering, two-way chamfering blade is extruded by hole wall so that it is logical Drilling is crossed, completes the two-way chamfering operation in hole to be processed.
- 2. two-way chamfering tool as claimed in claim 1, it is characterised in that the fixture includes a cover plate, the cover plate It is fixed on by the screw being engaged on cutter hub.
- 3. two-way chamfering tool as claimed in claim 1, it is characterised in that the governor motion includes：At least two flexible members affixed with cutter hub connection end；The adjusting screw being engaged with cover plate；Wherein, the other end of each flexible member is connected on a supporting plate that can be movable in square opening, and then passes through tune Section screw is connected with cover plate.
- 4. two-way chamfering tool as claimed in claim 3, it is characterised in that the flexible member is configured to compress spring.
- 5. two-way chamfering tool as claimed in claim 4, it is characterised in that the outside of the compression spring is arranged with to it The guidance set that compression direction is oriented to, the guidance set are configured as expansion link.
- 6. two-way chamfering tool as claimed in claim 1, it is characterised in that the forward and backward both ends of the two-way chamfering blade are equal With the cutting edge being engaged with chamfer angle to be processed；Wherein, between the cutting edge by a curved portions and then transition, and the circular arc of the curved portions is configured as being less than and added The radius in work hole.
- 7. two-way chamfering tool as claimed in claim 1, it is characterised in that the cutter hub has with one end that cover plate coordinates To accommodate the deep gouge of cover plate, and the cutter hub in the one end being engaged with cover plate there are at least two pairs of flexible members to limit Fixed circular hole, circular hole semicircle cavity corresponding to composition on cutter hub after being run through by square opening.
- 8. two-way chamfering tool as claimed in claim 1, it is characterised in that be provided with the cutter hub by the square opening with The air-vent of external world's connection.
- 9. two-way chamfering tool as claimed in claim 8, it is characterised in that the air-vent is configured as the length with cutter hub Direction is parallel, and on the longitudinally central line of cutter hub.
- 10. two-way chamfering tool as claimed in claim 1, it is characterised in that the front end of the cutter hub is provided with for completing The cutter head of drilling, and at least one spiral helicine chip area is provided with the cutter hub.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711165255.3A CN107716963A (en) | 2017-11-21 | 2017-11-21 | A kind of two-way chamfering tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711165255.3A CN107716963A (en) | 2017-11-21 | 2017-11-21 | A kind of two-way chamfering tool |
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| CN107716963A true CN107716963A (en) | 2018-02-23 |
Family
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|---|---|---|---|
| CN201711165255.3A Pending CN107716963A (en) | 2017-11-21 | 2017-11-21 | A kind of two-way chamfering tool |
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| CN (1) | CN107716963A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111715922A (en) * | 2020-06-12 | 2020-09-29 | 成都工具研究所有限公司 | Quick-change type automatic chamfering drill |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111715922A (en) * | 2020-06-12 | 2020-09-29 | 成都工具研究所有限公司 | Quick-change type automatic chamfering drill |
| CN111715922B (en) * | 2020-06-12 | 2022-05-13 | 成都工具研究所有限公司 | Quick-change type automatic chamfering drill |
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