CN206543889U - Boring Bar and lathe - Google Patents
Boring Bar and lathe Download PDFInfo
- Publication number
- CN206543889U CN206543889U CN201720123118.2U CN201720123118U CN206543889U CN 206543889 U CN206543889 U CN 206543889U CN 201720123118 U CN201720123118 U CN 201720123118U CN 206543889 U CN206543889 U CN 206543889U
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- Prior art keywords
- cutter spindle
- cylinder
- boring bar
- sleeve
- end cap
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- Cutting Tools, Boring Holders, And Turrets (AREA)
Abstract
The utility model provides a kind of Boring Bar and lathe, belong to machining equipment field, including cutter spindle, sleeve and magnet exciting coil, wherein, sleeve is set in outside cutter spindle, and sealed toroidal cavity is formed between sleeve and cutter spindle, and magnet exciting coil is set in outside cutter spindle, and magnet exciting coil is located in toroidal cavity, magnet exciting coil has the lead for being used for being connected with power supply.The Boring Bar can suppress the generation of flutter during size, by changing the additional size of current being applied on magnet exciting coil so as to change applied field strengths size, and then changing the dynamic characteristic (referring mainly to intrinsic frequency and damping) of whole vibration absorber, final realize effectively suppresses that the purpose of flutter occurs during size.
Description
Technical field
The utility model is related to machining equipment field, in particular to a kind of Boring Bar and lathe.
Background technology
In metal cutting process often can along with flutter generation, and flutter have a strong impact on workpiece quality,
Precision and stock-removing efficiency.For this harm, domestic and international researcher refers to control method to oscillation ordering and has done many researchs.At present
Main method for oscillating is divided into passive control, active control and semi- active control.
The apparatus structure passively controlled is simple, it is easy to accomplish, good reliability, but this method performance is single, it is impossible to meet
Some complicated controls；Requirement of the active control to the precision and control system of detection is all very high, in addition effect of the time lag to control
Fruit influence is also than larger；And semi- active control has had the advantage of passive control and active control concurrently, especially piezoelectricity is made pottery in recent years
The intellectual materials such as porcelain, marmem, magnetic flow liquid must be applied so that suppression of the semi- active control to vibration is more efficient
.Magnetorheological materials are invented by American scholar J.Rabinow earliest, in the case of without externally-applied magnetic field, consolidating in magnetic flow liquid
Body particle mixed and disorderly can freely be distributed, and after having externally-applied magnetic field, solid particle can be gathered into chain, and magnetic flow liquid has liquid and is changed into
Class solid-state, and with certain shear yield strength.After externally-applied magnetic field disappears, magnetic flow liquid can rapidly be converted to liquid again
State, this process is Millisecond.Magnetic flow liquid has rigidity and damps that controllable, response is rapid, energy consumption is low, operating voltage is relatively low
The advantages of, for its semi- active control application prospect than wide.
Utility model content
The purpose of this utility model is to provide a kind of Boring Bar, during improving in traditional metal cutting process
Often can along with flutter generation, and flutter is the problem of have a strong impact on the quality, precision and stock-removing efficiency of workpiece.
The purpose of this utility model also resides in a kind of lathe of offer, to improve in traditional metal cutting process often
Can along with flutter generation, and flutter is the problem of have a strong impact on the quality, precision and stock-removing efficiency of workpiece.
What embodiment of the present utility model was realized in：
Based on above-mentioned first purpose, the utility model provides a kind of Boring Bar, including cutter spindle, sleeve and excitation
Coil, wherein, the sleeve is set in outside the cutter spindle, sealedly annular is formed between the sleeve and the cutter spindle empty
Chamber, the magnet exciting coil is set in outside the cutter spindle, and the magnet exciting coil is located in the toroidal cavity, the excitation wire
Circle is with the lead for being used to be connected with power supply.
In the utility model preferred embodiment, the cutter spindle has the connection being connected with lathe along its length
End and the installation end for installing cutter, the sleeve are set in the end of the close installation end of the cutter spindle.
In the utility model preferred embodiment, perforate is provided with the perisporium of the sleeve, the lead is arranged in
The perforate.
In the utility model preferred embodiment, the sleeve coordinates with the knife bar shaft clearance.
In the utility model preferred embodiment, the sleeve includes cylinder and end cap, and the cylinder is set in institute
State on cutter spindle, the end cap is set on the cutter spindle, the end cap is located at the connection of the cylinder and the cutter spindle
Between end, annular groove is formed between the cylinder and the cutter spindle, the end cap is sealed on the close described of the annular groove
The cutter spindle, the cylinder and the end cap is set to surround the toroidal cavity, the cylinder and institute at the notch of connection end
State cutter spindle to be fixedly connected, the end cap is fixedly connected with the cylinder.
In the utility model preferred embodiment, the cylinder is connected by screw with the end cap, the cylinder with
The cutter spindle is connected by screw.
In the utility model preferred embodiment, in addition to sealing ring, pass through between the end cap and the cutter spindle
The sealing ring axial seal；End cap contact with cylinder end passes through the sealing ring radial seal；It is described
Cylinder contact with cutter spindle end passes through the sealing ring radial seal.
In the utility model preferred embodiment, it is provided with the perisporium of the cylinder in import and export, the import and export
Sealing is fitted with rubber plug.
In the utility model preferred embodiment, magnetic flow liquid is filled with the toroidal cavity.
Based on above-mentioned second purpose, the utility model provides a kind of lathe, including described Boring Bar.
The beneficial effect of the utility model embodiment is：
In summary, the utility model embodiment provides a kind of Boring Bar, and its is simple and reasonable, is easy to manufacture to add
Work, install with it is easy to use, meanwhile, the Boring Bar can suppress the generation of flutter during size, by change outside be affixed by
The size of current being added on magnet exciting coil is so as to change applied field strengths size, and then it is special to change the dynamic of whole vibration absorber
Property (referring mainly to intrinsic frequency and damping), final realize effectively suppress that the purpose of flutter occurs during size.It is specific as follows：
The Boring Bar that the present embodiment is provided, Boring Bar includes cutter spindle, and one end of cutter spindle is arranged on lathe
On tool rest, the other end of cutter spindle is used to installing improved regular turning tool, and the outer cover of cutter spindle is provided with sleeve, sleeve it is interior
Sealed toroidal cavity is formd between side face and the outer peripheral face of cutter spindle, in use, magnetic flow liquid is filled with toroidal cavity,
In the case of without externally-applied magnetic field, the solid particle in magnetic flow liquid mixed and disorderly can freely be distributed, after having externally-applied magnetic field, solid
Particle can be gathered into chain, and magnetic flow liquid has liquid and is changed into class solid-state, and with certain shear yield strength.Work as externally-applied magnetic field
After disappearance, magnetic flow liquid can rapidly be converted to liquid again, and this process is Millisecond.Meanwhile, it is provided with knife bar outer shaft sleeve
Magnet exciting coil, magnet exciting coil has the lead being connected with external power source, and the Boring Bar employs magnetic flow liquid shearing and extruded
Blend modes of operation, changes applied field strengths size, so as to change in real time by the size of current applied on regulating winding
The dynamic characteristic such as the rigidity of Boring Bar and damping, the effective generation for suppressing flutter.The Boring Bar is beneficial to improve turning
Surface quality, precision and the stock-removing efficiency of outer bowlder workpiece, extend the service life of lathe-tooling system.
The lathe that the present embodiment is provided includes above-mentioned Boring Bar, all advantages with Boring Bar.
Brief description of the drawings
In order to illustrate more clearly of the technical scheme of the utility model embodiment, it will use below required in embodiment
Accompanying drawing be briefly described, it will be appreciated that the following drawings illustrate only some embodiments of the present utility model, therefore should not be by
Regard the restriction to scope as, for those of ordinary skill in the art, on the premise of not paying creative work, may be used also
To obtain other related accompanying drawings according to these accompanying drawings.
Fig. 1 is the sectional view of the Boring Bar of the utility model embodiment；
Fig. 2 is the sectional view of the distressed structure of the Boring Bar of the utility model embodiment；
Fig. 3 is the sectional view (injection magnetic flow liquid) of the Boring Bar of the utility model embodiment；
Fig. 4 is the structural representation of the rubber plug of the Boring Bar of the utility model embodiment.
Icon：100- cutter spindles；110- installation ends；120- connection ends；200- sleeves；210- cylinders；211- is opened
Hole；212- is imported and exported；220- end caps；300- magnet exciting coils；310- leads；400- screws；500- magnetic flow liquids；
600- sealing rings；800- rubber plugs.
Embodiment
In metal cutting process often can along with flutter generation, and flutter have a strong impact on workpiece quality,
Precision and stock-removing efficiency.For this harm, domestic and international researcher refers to control method to oscillation ordering and has done many researchs.At present
Main method for oscillating is divided into passive control, active control and semi- active control.The apparatus structure passively controlled is simple, it is easy to real
It is existing, good reliability, but this method performance is single, it is impossible to meet some complicated controls.Active control to the precision of detection and
The requirement of control system is all very high, in addition time lag to the influential effect of control also than larger.
In consideration of it, the utility model designer devises a kind of Boring Bar and lathe, employ magnetic flow liquid 500 and squeeze
Pressure and the blend modes of operation of shearing, applied field strengths size is changed by the size of current applied on regulating winding, so that
Change the dynamic characteristics such as rigidity and the damping of Boring Bar, the effective generation for suppressing flutter in real time.The invention is beneficial to carry
The surface quality of workpiece, precision and stock-removing efficiency during high size, extend the service life of lathe-tooling system.
It is new below in conjunction with this practicality to make the purpose, technical scheme and advantage of the utility model embodiment clearer
Accompanying drawing in type embodiment, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that retouched
The embodiment stated is a part of embodiment of the utility model, rather than whole embodiments.Generally here described in accompanying drawing and
The component of the utility model embodiment shown can be arranged and designed with a variety of configurations.
Therefore, the detailed description of embodiment of the present utility model below to providing in the accompanying drawings is not intended to limit requirement
The scope of the present utility model of protection, but it is merely representative of selected embodiment of the present utility model.Based in the utility model
Embodiment, the every other embodiment that those of ordinary skill in the art are obtained under the premise of creative work is not made, all
Belong to the scope of the utility model protection.
It should be noted that：Similar label and letter represents similar terms in following accompanying drawing, therefore, once a certain Xiang Yi
It is defined in individual accompanying drawing, then it further need not be defined and explained in subsequent accompanying drawing.
, it is necessary to explanation, the orientation or position relationship of the instruction such as term " interior ", " outer " in description of the present utility model
For based on orientation shown in the drawings or position relationship, or the orientation or position that the utility model product is usually put when using
Relation, is for only for ease of description the utility model and simplifies description, rather than indicate or imply that the device or element of meaning must
There must be specific orientation, with specific azimuth configuration and operation, therefore it is not intended that to limitation of the present utility model.
In description of the present utility model, in addition it is also necessary to which explanation, unless otherwise clearly defined and limited, term " are set
Put ", " installation ", " connected ", " connection " should be interpreted broadly, for example, it may be fixedly connected or be detachably connected,
Or be integrally connected；Can be mechanical connection or electrical connection；Can be joined directly together, intermediary can also be passed through
It is indirectly connected to, can is the connection of two element internals.For the ordinary skill in the art, it can be managed with concrete condition
Solve concrete meaning of the above-mentioned term in the utility model.
It should be noted that in the case where not conflicting, the feature in embodiment and embodiment in the utility model can
To be mutually combined.
Boring Bar embodiment
Referring to Fig. 1, present embodiments provide a kind of Boring Bar, employ that magnetic flow liquid 500 extrudes and shear is mixed
Mode of operation is closed, applied field strengths size is changed by the size of current applied on regulating winding, subtracted so as to change in real time
Shake the rigidity and the dynamic characteristic, the effective generation for suppressing flutter such as damping of knife bar.When the invention is beneficial to improve size
Surface quality, precision and the stock-removing efficiency of workpiece, extend the service life of lathe-tooling system.
Boring Bar includes cutter spindle 100, sleeve 200 and magnet exciting coil 300.Sleeve 200 is set in cutter spindle 100
Outside, magnet exciting coil 300 is located between cutter spindle 100 and sleeve 200, is formd between sleeve 200 and cutter spindle 100 sealedly
Toroidal cavity, magnet exciting coil 300 is located in toroidal cavity.In use, needing to fill magnetic flow liquid 500 in toroidal cavity, most
Whole toroidal cavity is filled with well, after magnet exciting coil 300 is powered, is applied to size of current on magnet exciting coil 300 by changing, is changed
Become the applied field strengths size of magnetic flow liquid 500, now the magnetic flow liquid 500 in toroidal cavity under additional magnetic fields by liquid
State becomes class solid-state, and the rigidity of Boring Bar and damping can increase, and can effectively suppress the generation of vibration.
Cutter spindle 100 can directly use existing cutter spindle 100, it is not necessary to carry out extra processing, be easy to use, section
Cost is saved.The shaft of cutter spindle 100 is that section is the shaft-like of circle, and its end for being used to install cutter is square, cutter spindle
100 have the connection end 120 for being used for being arranged on lathe along its length, and for installing the installation end 110 of cutter, even
Connect end 120 and the connection of the tool rest of lathe uses existing connected mode, install and convenient disassembly, set on installation end 110
Screwed hole is equipped with, Cutting tool installation manner is spirally connected fixation after installation end 110 by screw 400, and mounting means is simple and reliable.
Sleeve 200 is set on cutter spindle 100, and sleeve 200 is in cylindrical tube, is easy to processing, and cutter spindle 100 is rotated
When, whole knife bar is more steady, reduces vibration.Sleeve 200 is set in after cutter spindle 100, is formd between cutter spindle 100 close
It is used to store magnetic flow liquid 500 in the toroidal cavity of envelope, toroidal cavity.During actual processing, sleeve 200 can be an entirety,
Sleeve 200 is to be fixedly connected with cutter spindle 100.Referring to Fig. 2, for the ease of installing, sleeve 200 to be set to split type, set
Cylinder 200 has cylinder 210 and end cap 220, and cylinder 210 is set in outside cutter spindle 100, and end cap 220 is set in cutter spindle 100
Outside, the installation end 110 of cylinder 210 and sleeve 200 all close to cutter spindle 100 is set, further, and cylinder 210 is located at installation end
Between 110 and end cap 220, the end face of cylinder 210 is fitted with cutter spindle 100, in the joint place, by screw 400 by knife bar
Axle 100 and cylinder 210 are spirally connected fixation, and connected mode is simple and reliable, is easily installed and dismantles, between cylinder 210 and cutter spindle 100
Annular groove is formd, the bottom land of annular groove is located at the end face joint place of cutter spindle 100 and cylinder 210, the notch direction of annular groove
The connection end 120 of cutter spindle 100, now, end cap 220 is covered at the notch of annular groove, end cap 220 is sealed with cylinder 210
Connection, i.e., cutter spindle 100, cylinder 210 and end cap 220 define sealed toroidal cavity, in order to improve the sealing of toroidal cavity
Property, sets between cutter spindle 100 and cylinder 210, between cutter spindle 100 and end cap 220 and between cylinder 210 and end cap 220
It is equipped with sealing ring 600.
Specifically pass through the axial seal of sealing ring 600 between end cap 220 and cutter spindle 100；End cap 220 and cylinder 210
Contact end passes through the radial seal of sealing ring 600；The contact with cutter spindle 100 of cylinder 210 end passes through the footpath of sealing ring 600
To sealing, the sealing of toroidal cavity is relatively reliable, and the magnetic flow liquid 500 in toroidal cavity is difficult leakage, can using safety
Lean on.
During actual processing, coordinated between sleeve 200 and cutter spindle 100 using gap, the inner peripheral surface of sleeve 200 is disc,
The outer peripheral face of cutter spindle 100 is disc, that is, forms the toroidal cavity of annular shape, and magnetic flow liquid 500 is evenly distributed, vibration damping effect
Fruit is more preferably.Specifically, the outer peripheral face gap of the inner peripheral surface of cylinder 210 and cutter spindle 100 coordinates, end cap 220 is set in cutter spindle
On 100, it is tightly connected respectively with cutter spindle 100 and cylinder 210.
Further, perforate 211 and import and export 212 are provided with cylinder 210, perforate 211 and import and export 212 are located at cylinder
On the perisporium of body 210, connect, perforate 211 is used for wearing for the lead 310 of magnet exciting coil 300, pass in and out with the barrel chamber of cylinder 210
Mouth 212 is used for the filling and discharge of magnetic flow liquid 500.The shape of perforate 211 and import and export 212 is set on demand, herein not
Concrete restriction is carried out, it is flexible during processing.
Referring to Fig. 4, it is further, it is provided with rubber plug 800, rubber plug at the import and export 212 of cylinder 210
800 are inserted into import and export 212, are tightly connected with cylinder 210, and rubber plug 800 has certain elastic deformation, stifled in rubber
After first 800 insertion imports and exports 212, the crimp of rubber plug 800, between can reducing between rubber plug 800 and cylinder 210
Gap, realizes sealing function.Rubber plug 800 is connected with cylinder 210 for inserting, is installed on convenient disassembly, easy to use and reliable.
During actual processing, import and export 212 and be provided in round hole, corresponding with smooth side face, rubber plug 800 is
Cheese head, and rubber plug 800 is additionally provided with annular protrusion, is easy to hand-held annular protrusion by plug from importing and exporting 212
Place is extracted, and when periphery is in contact with periphery, gap is small, good sealing effect.
Magnet exciting coil 300 is located in toroidal cavity, and during actual installation, magnet exciting coil 300 is set on cutter spindle 100,
Easy for installation, " excitation " is exactly the meaning for exciting generation in magnet exciting coil 300.By the electric current of change in coil, along along coil
The heart just has the magnetic line of force to pass through, and electric current is bigger, and the magnetic line of force is also more, until saturation, turn-off current, magnetic force heading line off, and this just cries and encouraged
Magnetic coil 300.Magnet exciting coil 300 has the lead 310 of external power supply, and lead 310 passes through perforate 211, and the position of lead 310 is consolidated
It is fixed, it is easy to be connected with power supply.During practical operation, lead 310 is connected with voltage-stabilized power supply, and electric current is more stablized, and is easy to control.
Referring to Fig. 3, it should be noted that when actual production is manufactured, magnetic flow liquid 500 can be full of in toroidal cavity
Afterwards using Boring Bar as global facility, or the injection magnetic flow liquid 500 not in toroidal cavity, when needing to use, then will
Magnetic flow liquid 500 fills up toroidal cavity, convenient and reliable when using.
The Boring Bar that the present embodiment is provided, when in use by the installation end 110 of the lathe tool transformed and cutter spindle 100
Assembling, is fixed with holding screw 400, then cutter spindle 100 is arranged on the tool rest of lathe, the lead 310 of magnet exciting coil 300
External power supply.When lathe carries out size, when finding that lathe-tool-workpiece system is vibrated, change is applied
Size of current on magnet exciting coil 300 is added in, changes the applied field strengths size of magnetic flow liquid 500, now the magnetic at fit-up gap
Rheology liquid 500 becomes class solid-state under additional magnetic fields by liquid, and the rigidity of Boring Bar and damping can increase, can be effective
Suppression vibration generation.
Lathe embodiment
A kind of lathe, including the Boring Bar that above-described embodiment is provided, in addition to lathe main body are present embodiments provided, is subtracted
The knife bar that shakes is arranged in lathe main body, when being cut, can effectively reduce the vibration of cutter spindle 100.
Preferred embodiment of the present utility model is the foregoing is only, the utility model is not limited to, for this
For the technical staff in field, the utility model can have various modifications and variations.It is all it is of the present utility model spirit and principle
Within, any modification, equivalent substitution and improvements made etc. should be included within protection domain of the present utility model.
Claims (10)
1. a kind of Boring Bar, it is characterised in that including cutter spindle, sleeve and magnet exciting coil, wherein, the sleeve is set in
Outside the cutter spindle, sealed toroidal cavity is formed between the sleeve and the cutter spindle, the magnet exciting coil is set in institute
State outside cutter spindle, and the magnet exciting coil is located in the toroidal cavity, the magnet exciting coil, which has, is used for what is be connected with power supply
Lead.
2. Boring Bar according to claim 1, it is characterised in that the cutter spindle has and lathe along its length
The connection end of connection and the installation end for installing cutter, the sleeve are set in the close installation end of the cutter spindle
End.
3. Boring Bar according to claim 1, it is characterised in that perforate is provided with the perisporium of the sleeve, described
Lead is arranged in the perforate.
4. Boring Bar according to claim 1, it is characterised in that the sleeve coordinates with the knife bar shaft clearance.
5. Boring Bar according to claim 4, it is characterised in that the sleeve includes cylinder and end cap, the cylinder
Body is set on the cutter spindle, and the end cap is set on the cutter spindle, and the end cap is located at the cylinder and the knife
Between the connection end of bar axle, annular groove is formed between the cylinder and the cutter spindle, the end cap is sealed on the annular groove
The close connection end notch at the cutter spindle, the cylinder and the end cap is surrounded the toroidal cavity, institute
State cylinder to be fixedly connected with the cutter spindle, the end cap is fixedly connected with the cylinder.
6. Boring Bar according to claim 5, it is characterised in that the cylinder is connected by screw with the end cap,
The cylinder is connected by screw with the cutter spindle.
7. Boring Bar according to claim 5, it is characterised in that also including sealing ring, the end cap and the knife bar
Pass through the sealing ring axial seal between axle；End cap contact with cylinder end passes through sealing ring radial direction
Sealing；Cylinder contact with cutter spindle end passes through the sealing ring radial seal.
8. Boring Bar according to claim 5, it is characterised in that import and export, institute are provided with the perisporium of the cylinder
State import and export interior sealing and be fitted with rubber plug.
9. the Boring Bar according to claim any one of 1-8, it is characterised in that magnetic is filled with the toroidal cavity
Rheology liquid.
10. a kind of lathe, it is characterised in that including the Boring Bar according to claim any one of 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720123118.2U CN206543889U (en) | 2017-02-10 | 2017-02-10 | Boring Bar and lathe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720123118.2U CN206543889U (en) | 2017-02-10 | 2017-02-10 | Boring Bar and lathe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206543889U true CN206543889U (en) | 2017-10-10 |
Family
ID=59993176
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720123118.2U Expired - Fee Related CN206543889U (en) | 2017-02-10 | 2017-02-10 | Boring Bar and lathe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206543889U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108213475A (en) * | 2018-03-09 | 2018-06-29 | 四川天博精工科技有限公司 | A kind of shockproof knife bar |
| CN109465506A (en) * | 2019-01-07 | 2019-03-15 | 哈尔滨理工大学 | A kind of turning steep-pitch thread Boring Bar |
| CN111761076A (en) * | 2020-07-23 | 2020-10-13 | 南京高速齿轮制造有限公司 | Long cantilever cutter bar device and lathe |
| CN116833437A (en) * | 2023-07-14 | 2023-10-03 | 松德刀具（长兴）科技有限公司 | Antimagnetic vibration damping cutter for processing deep holes of permanent magnet parts |
-
2017
- 2017-02-10 CN CN201720123118.2U patent/CN206543889U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108213475A (en) * | 2018-03-09 | 2018-06-29 | 四川天博精工科技有限公司 | A kind of shockproof knife bar |
| CN108213475B (en) * | 2018-03-09 | 2024-06-04 | 四川天博精工科技有限公司 | Shockproof cutter bar |
| CN109465506A (en) * | 2019-01-07 | 2019-03-15 | 哈尔滨理工大学 | A kind of turning steep-pitch thread Boring Bar |
| CN111761076A (en) * | 2020-07-23 | 2020-10-13 | 南京高速齿轮制造有限公司 | Long cantilever cutter bar device and lathe |
| CN116833437A (en) * | 2023-07-14 | 2023-10-03 | 松德刀具（长兴）科技有限公司 | Antimagnetic vibration damping cutter for processing deep holes of permanent magnet parts |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
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Granted publication date: 20171010 Termination date: 20180210 |