CN101992305B - Balance adjustable cutting tool - Google Patents
Balance adjustable cutting tool Download PDFInfo
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- CN101992305B CN101992305B CN2010105332185A CN201010533218A CN101992305B CN 101992305 B CN101992305 B CN 101992305B CN 2010105332185 A CN2010105332185 A CN 2010105332185A CN 201010533218 A CN201010533218 A CN 201010533218A CN 101992305 B CN101992305 B CN 101992305B
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- cutter
- cutter holder
- balance
- cutter hub
- cutting tool
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Abstract
The invention discloses a balance adjustable cutting tool comprising a tool body, a toolholder, a cutting blade and a toolholder fastening member, wherein the tool body is provided with at least one tool groove and a balance member; the cutting blade is fixed on the toolholder, and the cutting blade and the toolholder are arranged in the tool groove together; the tool body is provided with a countersunk head hole communicated with the tool groove; the toolholder is provided with a fastening threaded hole which corresponds to the countersunk head hole; the toolholder fastening member is arranged in the countersunk head hole and is in threaded connection with the fastening threaded hole; and the toolholder is pressed and fixed by the toolholder fastening member. The balance adjustable cutting tool has the advantages of simple and compact structure, convenience in processing and manufacture and low production cost.
Description
Technical field
The present invention relates to the metal cutting manufacture field, relate in particular to the adjustable cutting tool of a kind of balance.
Background technology
It is found that in the rotation type cutting tool working angles, high-speed cutting when 5000m/min (especially linear velocity V >=) can improve working (machining) efficiency greatly, improve machined surface quality.In high-speed machining process, eccentric mass produces bigger uneven centrifugal force, reduces machined surface quality thereby make cutting tool be easy to generate vibration.The general employing of this type of existing cutter structure as depicted in figs. 1 and 2; In order to reduce uneven centrifugal force, need to reduce the eccentric mass of the relative centre of gyration of cutting tool, so cutter hub 1 adopts the little material (being generally aluminium alloy) of a kind of density; Than ordinary cutting tool material (being generally steel); Said material has the advantages that density is little, intensity is low, hardness is low, not wear-resisting, for the friction that reduces securing member and cutter hub 1, the service life that prolongs cutting tool, does not reduce the clamping force of securing member to cutting tip 3 simultaneously again; General securing member does not act directly on the cutter hub 1; But with cutting tip 3 directly be connected in intensity preferably on the cutter holder 2 after, a post hole 36 of passing on the cutter hub 1 with cutter holder securing member 5 connects a steel bushing 37, on these steel bushing 37 outer surfaces some taper holes 38 is arranged; The screw 40 that is orthogonal to steel bushing axis 39 through with cutter hub 1 on screwed hole cooperate and be pressed into taper hole 38; Steel bushing 37 is fixedly connected with cutter hub 1, and cutter holder securing member 5 passes through and steel bushing 37 inner threaded surface effects, and cutter holder 2 and cutting tip 3 are clamped on the cutter hub 1.Cutter holder securing member 5 links to each other with cutter hub 1 through steel bushing 37 indirectly, has strengthened the clamping force of cutter holder securing member 5, in the time of effectively avoiding cutter holder securing member 5 directly to link to each other with cutter hub 1 because of the not wear-resisting life-span of reducing cutting tool of the flank on the cutter hub 1.Though, adopt the little material of this density to make the eccentric mass that cutter hub 1 can effectively reduce cutting tool, can't eliminate fully.In order to guarantee machined surface quality; This type of cutter generally all has dynamic balancing adjustment structure, in order to realize the dynamic balancing cutting, usually on the outer peripheral face of the vicinity, non-cutting end of cutting tool; Be distributed with the balance element 6 that has equivalent amount with cutting tip 3; This balance element 6 is distributed on the circle with the cutting tool orthogonality of center shaft, the moving in the radial direction of this circle, can adjust the eccentric mass of cutting tool through balance element 6.This have the adjustable structure of dynamic balancing, the influence that can effectively avoided uneven centrifugal force to bring to cutting.
But, in cutter hub 1, stud with a steel bushing 37, make cutting tool structure too complicated, the assembly precision of cutter hub 1 is had relatively high expectations, greatly improved the making and the use cost of cutting tool; Simultaneously, in the high-speed machining process, along with the increase of cutting speed, balance element 6 suffered centrifugal force increase gradually, because cutter hub 1 undercapacity, the centripetal force that can provide is limited, and balance element 6 is prone to fly out.
Summary of the invention
The technical problem that the present invention will solve is the deficiency that overcomes prior art, provide a kind of simple and compact for structure, be convenient to processing and fabricating, the adjustable cutting tool of balance that production cost is low.
For solving the problems of the technologies described above, the present invention adopts following technical scheme:
The cutting tool that a kind of balance is adjustable; Comprise cutter hub, cutter holder, cutting tip and cutter holder securing member; Said cutter hub is provided with at least one group of cutter groove and balance element; Said cutting tip is fixed on the cutter holder and with cutter holder and together places in the cutter groove, and said cutter hub is provided with the counter sink that communicates with the cutter groove, and said cutter holder is provided with the fastening screw pit corresponding with said counter sink; Said cutter holder securing member is installed in the counter sink and with said fastening screw pit and is threaded, and said cutter holder is fixed through the cutter holder securing member.
Said cutter holder is provided with connection screw thread hole; Said cutting tip is fixed on the cutter holder through the connection securing member that is connected with said connection screw thread hole; Said fastening screw pit and said connection screw thread hole are α along cutter hub angle in the radial direction; Said fastening screw pit and said connection screw thread hole are β along the angle on the cutter hub axial direction, 0 °≤α≤45 °, and 0 °≤β≤25 °.
Said cutter groove is surrounded by groove bottom, locating surface and fairing face; Said groove bottom is provided with the shallow bore hole with said connection screw thread hole coaxial arrangement; The angle of said locating surface and shallow bore hole central axis is γ; Said cutter holder is provided with boss, and the said cutter holder outside is provided with bottom surface that contacts with said groove bottom and the contact-making surface that contacts with said fairing face, and the boss outside of said cutter holder is provided with the outer peripheral face that contacts with said locating surface; The angle of said outer peripheral face and said connection screw thread hole central axis is λ, 0.25 °≤λ-γ≤3 °.
Be provided with an inclined-plane between the locating surface of said cutter groove and the groove bottom, be provided with clearance face between the outer peripheral face of said cutter holder and the bottom surface, be provided with the pretension gap between said inclined-plane and the said clearance face.
Said inclined-plane is parallel with said clearance face.
Said fairing face and said groove bottom quadrature, said contact-making surface and said bottom surface quadrature.
The boss of said cutter holder is provided with the balance screwed hole, and said cutter hub is provided with the cutter hub screwed hole corresponding with the balance screwed hole, and said balance element passes the cutter hub screwed hole and is threaded with the balance screwed hole.
The centre of gyration axis coplane of the central axis of said cutter hub screwed hole and said cutter hub.
Said cutter hub screwed hole one end and said balance screwed hole join, and the other end communicates with the installing hole at said cutter hub center, and said cutting tip blocks the balance screwed hole place in cutter holder.
Compared with prior art, the invention has the advantages that:
The cutting tool that balance of the present invention is adjustable; Through on cutter hub, offering counter sink; Cutter holder securing member with the counter sink of packing into directly is connected with cutter holder, has not only cancelled the labyrinth of existing steel bushing connected mode, makes structure simplify greatly, reduce production costs; And can be more firm cutter holder and cutting tip are clamped on the cutter hub, thereby improve the cutting precision of cutting tool in high-speed cutting.Rationally be provided with along the angle on cutter hub radial direction and the axial direction through cutter holder being tightened solid screwed hole and connection screw thread hole; Can prevent effectively that the cutter holder securing member is flown out by centrifugal forces affect when rotating at a high speed with cutter hub; Can make simultaneously cutter holder tool setting groove produce normal direction, radial and axial pressure, effectively reduce the contact gap between cutter hub and the cutter holder.Through between the outer peripheral face of the locating surface of cutter groove and cutter holder convex platform, certain included angle being set, when fixing cutter holder, can make boss produce elastic deformation, make being connected more closely of cutter holder and cutter groove, firmly.Between the bottom surface of cutter holder and outer peripheral face, be provided with clearance face; This clearance face can reduce the elasticity wall thickness of boss when reducing the cutter holder quality; Make boss that elastic deformation take place more easily; Between an inclined-plane of the clearance face of cutter holder and cutter hub, be provided with the pretension gap, the elastic deformation through boss can make cutter hub and cutter holder the contacting fully in the radial direction of cutter hub, the stability when when eliminating the pretension gap, improving connective stability, also having improved cutting tool at radial feed.Balance element passes that set balance screwed hole is threaded on the boss of cutter hub screwed hole and cutter holder on the cutter hub; Balance element not only can be adjusted the cutting dynamic balancing; Can also cutter hub and cutter holder be linked together; Make cutter holder and cutter hub form a kind of location structure excessively, thereby make cutting tool have stronger shock-resistant ability.In high-speed machining process, when the cutter hub screwed hole deficiency that reaches cutter hub when cutting speed overcomes the centrifugal force of balance element, can by intensity preferably the balance screwed hole on the cutter holder help balance element to overcome centrifugal force, improved advantage for improving the cutting speed upper limit.Cutting tip blocks the balance screwed hole place in cutter holder, when the cutter hub screwed hole of cutter hub and the balance screwed hole on the cutter holder neither are enough to overcome the centrifugal force of balance element, restrain balance element by cutting tip and flies out, and can protect operating personnel's safety.
Description of drawings
Fig. 1 is first perspective view of cutting tool in the prior art;
Fig. 2 is second perspective view of cutting tool in the prior art;
Fig. 3 is the perspective view of cutting tool of the present invention;
Fig. 4 is the enlarged diagram of cutter groove in the cutting tool of the present invention;
Fig. 5 is the main TV structure sketch map of cutter groove in the cutting tool of the present invention;
Fig. 6 is the perspective view of cutter holder in the cutting tool of the present invention;
Fig. 7 is the main TV structure sketch map of cutter holder in the cutting tool of the present invention;
Fig. 8 is the perspective view of cutting tip in the cutting tool of the present invention;
Fig. 9 is the A-A cutaway view of Fig. 5;
Figure 10 is the B-B cutaway view of Fig. 7;
Figure 11 is the C-C cutaway view of Fig. 7.
Each label is represented among the figure:
1, cutter hub; 2, cutter holder; 3, cutting tip; 4, connect securing member; 5, cutter holder securing member; 6, balance element; 7, chip pocket; 8, cutter groove; 9, fairing face; 10, locating surface; 11, cutter hub screwed hole; 12, shallow bore hole; 13, counter sink; 14, groove bottom; 15, inclined-plane; 16, contact-making surface; 17, outer peripheral face; 18, installing hole; 19, balance screwed hole; 20, connection screw thread hole; 21, bottom surface; 22, fastening screw pit; 23, inner peripheral surface; 24, sagittal plane; 25, clearance face; 26, pretension gap; 27, upper bottom surface; 28, boss; 30, end face; 31, side; 32, basal plane; 36, post hole; 37, steel bushing; 38, taper hole; 39, steel bushing axis; 40, screw.
The specific embodiment
Fig. 3 to Figure 11 shows the adjustable cutting tool embodiment of a kind of balance of the present invention; This cutting tool comprises cutter hub 1, cutter holder 2, cutting tip 3 and cutter holder securing member 5; Cutter hub 1 is provided with at least one group of cutter groove 8 and balance element 6, and cutter holder 2 has the three interior side-locating faces of being made up of sagittal plane 24, inner peripheral surface 23 and upper bottom surface 27, and the end face 30 of cutting tip 3 cooperates with sagittal plane 24; The side 31 of cutting tip 3 cooperates with inner peripheral surface 23; The basal plane 32 of cutting tip 3 cooperates with upper bottom surface 27, and cutter holder 2 is provided with connection screw thread hole 20, and cutting tip 3 is fixed on the cutter holder 2 through the connection securing member 4 that is connected with connection screw thread hole 20; In each cutter groove 8 one group of cutting tip 3 and cutter holder 2 are installed; Present embodiment only is provided with one group of cutter groove 8 and balance element 6 and one group of corresponding with it cutting tip 3 and cutter holder 2, and cutter groove 8 sides are provided with chip area 7, and the quantity of cutter groove 8, balance element 6, cutting tip 3 and cutter holder 2 can be decided according to the needs of concrete cutting situation; Cutter hub 1 is provided with the counter sink 13 that communicates with cutter groove 8; Cutter holder 2 is provided with the fastening screw pit 22 corresponding with counter sink 13, and cutter holder securing member 5 is installed in the counter sink 13 and with fastening screw pit 22 and is threaded, and cutter holder 2 is fixed through cutter holder securing member 5.The cutting tool that balance of the present invention is adjustable; Through on cutter hub 1, offering counter sink 13; Cutter holder securing member 5 with the counter sink 13 of packing into directly is connected with cutter holder 2, has not only cancelled the labyrinth of existing steel bushing connected mode, makes structure simplify greatly, reduce production costs; And can be more firm cutter holder 2 and cutting tip 3 are clamped on the cutter hub 1, thereby improve the cutting precision of cutting tool in high-speed cutting.
In the present embodiment, fastening screw pit 22 is α with connection screw thread hole 20 along cutter hub 1 angle in the radial direction, and fastening screw pit 22 is β with connection screw thread hole 20 along the angle on cutter hub 1 axial direction; 0 °≤α≤45 °, 0 °≤β≤25 °, in the present embodiment; α is 10 °, and β is 15 °.Through fastening screwed hole 22 on the cutter holder 2 rationally is provided with along the angle on cutter hub 1 radial direction and the axial direction with connection screw thread hole 20; Can prevent effectively that cutter holder securing member 5 is flown out by centrifugal forces affect when rotating at a high speed with cutter hub 1; Can make simultaneously cutter holder 2 tool setting grooves 8 produce normal direction, radial and axial pressure, effectively reduce the contact gap between cutter hub 1 and the cutter holder 2.
In the present embodiment, cutter groove 8 is surrounded by groove bottom 14, locating surface 10 and fairing face 9, fairing face 9 and groove bottom 14 quadratures; Groove bottom 14 is provided with the shallow bore hole 12 with connection screw thread hole 20 coaxial arrangement, and locating surface 10 is γ with the angle of shallow bore hole 12 central axis, and cutter holder 2 is provided with boss 28; Cutter holder 2 outsides are provided with bottom surface 21 and contact-making surface 16, contact-making surface 16 and bottom surface 21 quadratures, and boss 28 outsides of cutter holder 2 are provided with outer peripheral face 17; Outer peripheral face 17 is λ with the angle of connection screw thread hole 20 central axis; 0.25 °≤λ-γ≤3 °, in the present embodiment, λ-γ is 0.75 °; This difference makes between the outer peripheral face 17 of locating surface 10 and cutter holder 2 convex platforms 28 of cutter groove 8 and forms certain included angle; Through cutter holder securing member 5 fixedly during cutter holder 2 boss 28 produce elastic deformations, make that bottom surface 21 closely contact with groove bottom 14, contact-making surface 16 closely contacts with fairing face 9, outer peripheral face 17 closely contacts with locating surface 10, guarantee that cutter holder 2 is tight more with being connected of cutter groove 8, firmly.Between the locating surface 10 of cutter groove 8 and groove bottom 14, be provided with an inclined-plane 15; Be provided with clearance face 25 between the outer peripheral face 17 of cutter holder 2 and the bottom surface 21; This clearance face 25 can reduce the elasticity wall thickness of boss 28 when reducing cutter holder 2 quality; Make boss 28 that elastic deformation take place more easily, be provided with pretension gap 26 between inclined-plane 15 and the clearance face 25, inclined-plane 15 is parallel with clearance face 25; Elastic deformation through boss 28 can make cutter hub 1 and cutter holder 2 the contacting fully in the radial direction of cutter hub 1, the stability when when eliminating pretension gap 26, improving connective stability, also having improved cutting tool at radial feed.
In the present embodiment; The boss 28 of cutter holder 2 is provided with balance screwed hole 19; Cutter hub 1 is provided with the cutter hub screwed hole 11 corresponding with balance screwed hole 19, and balance element 6 passes cutter hub screwed hole 11 and is threaded with balance screwed hole 19, the centre of gyration axis coplane of the central axis of cutter hub screwed hole 11 and cutter hub 1; Cutter hub screwed hole 11 1 ends and balance screwed hole 19 join; The other end communicates with the installing hole 18 at cutter hub 1 center, and balance element 6 moves axially along cutter hub screwed hole 11 and balance screwed hole 19 can adjust the cutting dynamic balancing, and balance element 6 has also played the effect that cutter hub 1 and cutter holder 2 are linked together; Make cutter holder 2 cross location structure, thereby make cutting tool have stronger shock-resistant ability with cutter hub 1 formation is a kind of.In high-speed machining process; When cutter hub screwed hole 11 deficiencies that reach cutter hub 1 when cutting speed overcome the centrifugal force of balance element 6; Can by intensity preferably the balance screwed hole on the cutter holder 2 19 help balance elements 6 to overcome centrifugal force, improved advantage for improving the cutting speed upper limit.Cutting tip 3 blocks balance screwed hole 19 places in cutter holder 2; When cutter hub screwed hole of cutter hub 1 11 and balance screwed hole 19 on the cutter holder 2 neither are enough to overcome the centrifugal force of balance element 6; Restrain balance element 6 by cutting tip 3 and fly out, can protect operating personnel's safety.According to technological requirement; Balance screwed hole 19 can be substituted by the through hole that a diameter is slightly larger than balance element 6 external diameters in the cutting tool that balance of the present invention is adjustable; Balance element 6 can move in this through hole, but is not limited, and overcomes balance element 6 suffered centrifugal force in high-speed machining process by cutter hub screwed hole 11; When cutter hub screwed hole 11 deficiencies overcome this centrifugal force, directly stop that through cutting tip 3 balance element 6 flies out; In addition, cutting tip 3 not only can be fixed on the cutter holder 2 through connecting securing member 4 as present embodiment is said, can also be through making cutting tip 3 and 2 permanent connections of cutter holder like methods such as welding.
Above-mentioned is preferred embodiment of the present invention, is not the present invention is done any pro forma restriction.Though the present invention discloses as above with preferred embodiment, yet be not in order to limit the present invention.Any those of ordinary skill in the art, under the situation that does not break away from technical scheme scope of the present invention, all the technology contents of above-mentioned announcement capable of using is made many possible changes and modification to technical scheme of the present invention, or is revised as the equivalent embodiment of equivalent variations.Therefore, every content that does not break away from technical scheme of the present invention, all should drop in the scope of technical scheme protection of the present invention any simple modification, equivalent variations and modification that above embodiment did according to technical spirit of the present invention.
Claims (6)
1. cutting tool that balance is adjustable; Comprise cutter hub (1), cutter holder (2), cutting tip (3) and cutter holder securing member (5); Said cutter hub (1) is provided with at least one group of cutter groove (8) and balance element (6); Said cutting tip (3) is fixed in cutter holder (2) and goes up and together place in the cutter groove (8) with cutter holder (2); It is characterized in that: said cutter hub (1) is provided with the counter sink (13) that communicates with cutter groove (8); Said cutter holder (2) is provided with the fastening screw pit (22) corresponding with said counter sink (13), and said cutter holder securing member (5) is installed in the counter sink (13) and with said fastening screw pit (22) and is threaded, and said cutter holder (2) is fixed through cutter holder securing member (5); Said cutter holder (2) is provided with connection screw thread hole (20); Said cutting tip (3) is fixed on the cutter holder (2) through the connection securing member (4) that is connected with said connection screw thread hole (20), and said fastening screw pit (22) is α with said connection screw thread hole (20) along cutter hub (1) angle in the radial direction, and said fastening screw pit (22) is β with said connection screw thread hole (20) along the angle on cutter hub (1) axial direction; 0 °≤α≤45 °; 0 °≤β≤25 °, said cutter groove (8) is surrounded by groove bottom (14), locating surface (10) and fairing face (9), and said groove bottom (14) is provided with the shallow bore hole (12) with said connection screw thread hole (20) coaxial arrangement; Said locating surface (10) is γ with the angle of shallow bore hole (12) central axis; Said cutter holder (2) is provided with boss (28), and said cutter holder (2) outside is provided with bottom surface (21) that contacts with said groove bottom (14) and the contact-making surface (16) that contacts with said fairing face (9), and boss (28) outside of said cutter holder (2) is provided with the outer peripheral face (17) that contacts with said locating surface (10); Said outer peripheral face (17) is λ with the angle of said connection screw thread hole (20) central axis, 0.25 °≤λ-γ≤3 °.
2. the adjustable cutting tool of balance according to claim 1; It is characterized in that: be provided with an inclined-plane (15) between the locating surface (10) of said cutter groove (8) and the groove bottom (14); Be provided with clearance face (25) between the outer peripheral face (17) of said cutter holder (2) and the bottom surface (21), be provided with pretension gap (26) between said inclined-plane (15) and the said clearance face (25).
3. the adjustable cutting tool of balance according to claim 2 is characterized in that: said inclined-plane (15) are parallel with said clearance face (25).
4. the adjustable cutting tool of balance according to claim 3 is characterized in that: said fairing face (9) and said groove bottom (14) quadrature, said contact-making surface (16) and said bottom surface (21) quadrature.
5. according to the adjustable cutting tool of each described balance in the claim 1 to 4; It is characterized in that: the boss (28) of said cutter holder (2) is provided with balance screwed hole (19); Said cutter hub (1) is provided with the cutter hub screwed hole (11) corresponding with balance screwed hole (19), and said balance element (6) passes cutter hub screwed hole (11) and is threaded with balance screwed hole (19).
6. the adjustable cutting tool of balance according to claim 5 is characterized in that: the centre of gyration axis coplane of the central axis of said cutter hub screwed hole (11) and said cutter hub (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105332185A CN101992305B (en) | 2010-11-05 | 2010-11-05 | Balance adjustable cutting tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105332185A CN101992305B (en) | 2010-11-05 | 2010-11-05 | Balance adjustable cutting tool |
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| Publication Number | Publication Date |
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| CN101992305A CN101992305A (en) | 2011-03-30 |
| CN101992305B true CN101992305B (en) | 2012-07-04 |
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| CN2010105332185A Active CN101992305B (en) | 2010-11-05 | 2010-11-05 | Balance adjustable cutting tool |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102000845B (en) * | 2010-11-05 | 2012-09-05 | 株洲钻石切削刀具股份有限公司 | Balance-adjustable cutting tool |
| CN102416506B (en) * | 2011-12-09 | 2013-06-12 | 株洲钻石切削刀具股份有限公司 | Cutting tool |
| CN102756137B (en) * | 2012-07-30 | 2015-12-02 | 株洲钻石切削刀具股份有限公司 | A kind of cutting tool |
| CN103624309B (en) * | 2012-08-28 | 2016-04-20 | 株洲钻石切削刀具股份有限公司 | There is the anti-milling cutter flying structure |
| CN103894663B (en) * | 2012-12-28 | 2016-12-28 | 株洲钻石切削刀具股份有限公司 | A kind of rotary cutting tool of axial accurate positioning |
| CN103894635B (en) * | 2012-12-28 | 2016-12-28 | 株洲钻石切削刀具股份有限公司 | A kind of constitutionally stable rotary cutting tool |
| CN106624101B (en) * | 2016-11-30 | 2020-07-10 | 株洲钻石切削刀具股份有限公司 | Wedge block with initial positioning function and adjustable cutter |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06155131A (en) * | 1992-11-30 | 1994-06-03 | Honda Motor Co Ltd | Balance adjusting mechanism for milling cutter |
| SE504338C2 (en) * | 1994-06-07 | 1997-01-13 | Sandvik Ab | Cutting plate |
| SE504332C2 (en) * | 1994-09-12 | 1997-01-13 | Sandvik Ab | drilling Tools |
| JP2001157908A (en) * | 1999-12-02 | 2001-06-12 | Canon Inc | Cutting machine, and cutting tool |
| US7052217B2 (en) * | 2001-08-08 | 2006-05-30 | Johne + Co. Prāzisionswerkzeuge GmbH | Multiple cutting edge rotary tool |
| CN102000845B (en) * | 2010-11-05 | 2012-09-05 | 株洲钻石切削刀具股份有限公司 | Balance-adjustable cutting tool |
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2010
- 2010-11-05 CN CN2010105332185A patent/CN101992305B/en active Active
Non-Patent Citations (1)
| Title |
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| JP平6-155131A 1994.06.03 |
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