CN105033290A - Multipurpose vibration cutting tool - Google Patents
Multipurpose vibration cutting tool Download PDFInfo
- Publication number
- CN105033290A CN105033290A CN201510411639.3A CN201510411639A CN105033290A CN 105033290 A CN105033290 A CN 105033290A CN 201510411639 A CN201510411639 A CN 201510411639A CN 105033290 A CN105033290 A CN 105033290A
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- Prior art keywords
- cutting
- clamping
- knife
- cutter
- clamping face
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Classifications
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- 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
-
- 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
- B23B27/002—Tools for turning or boring machines; Tools of a similar kind in general; Accessories therefor with vibration damping means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2205/00—Fixation of cutting inserts in holders
- B23B2205/12—Seats for cutting inserts
Abstract
A multipurpose vibration cutting tool comprises a tool head, two compliant hinges, two piezoelectric stack actuators which are arranged in parallel in the same direction and a base which is provided with a clamping part; the two opposite sides of the base are provided with grooves used for containing the piezoelectric stack actuators respectively, wherein the two complaint hinges are installed on the upper surface of the base to make the lower surfaces of the complaint hinges tightly pressed on the upper surfaces of the corresponding piezoelectric stack actuators respectively, the lower surface of the tool head is fixed on the upper surfaces of the compliant hinges which are arranged in parallel, when drive signals with certain phase differences are applied on the piezoelectric stack actuators respectively, the vibration locus of the tool tip of each blade is an oval, the clamping part is provided with multiple pairs of clamping faces which comprise a first clamping face, and when the vibration cutting tool is clamped through the first clamping face, the projections of the vibration locus of each tool tip on the orthographic face which is formed in the cutting depth direction and the cutting speed direction and the orthographic face which is formed in the cutting depth direction and the feed direction are both ovals.
Description
Technical field
The present invention relates to Machining Technology field, more specifically, relate to a kind of multipurpose vibrocutting cutter.
Background technology
The technological process of traditional precision turning processing is: rough turn-finish turning-grinding.This processing technology operation is more, processing cost is higher, and man-hour is longer.In addition, because grinding force is comparatively large, grinding process easily causes workpiece temperature distortion, produces residual stress, reduces the fatigue properties of workpiece.Meanwhile, the spark produced due to grinding is easily burnt surface of the work, so perishable by the finished parts of this processes.
Point of a knife vibrates in a different direction different effects, such as, the cutting-in direction vibration of point of a knife can suppress tool wear, reduce the heat in metal cutting of generation and be conducive to chip breaking, point of a knife can improve surface quality of workpieces in direction of feed vibration, and point of a knife vibrates on cutting speed direction can reduce cutting force.Because vibrocutting can replace the grinding process of conventional machining process, so the cost of processing work can be reduced, avoid producing Grinding defects, can man-hour be saved simultaneously.Application number be 201520430730.5 patent propose a kind of vibrocutting cutter, in this vibrocutting cutter, cutter head and cutter hub are by submissive chain connection, and piezo stack pushes away driver drives cutter head produces vibration.But this vibration is two-dimension vibration, that is, only in cutting-in direction with feed direction and produce oscillating component, or only produce oscillating component in cutting-in direction and cutting speed direction.
When the oscillation trajectory of cutter is in oval, and the projection in cutting speed direction and the orthogonal plane of direction of feed composition and the normal plane of this plane is all in time oval, is called three-dimensional elliptical vibrocutting.The three-dimensional elliptical vibration of cutter, all oscillating component can be produced feeding direction, cutting-in direction and cutting speed direction, therefore separating mechanism, speed change mechanism, frictional force reverse phase mechanism can be produced when cutting, reduce cutting force and heat in metal cutting, reduce the generation of built-up edge, restrain tool wear, accelerate chip discharge.Because cutting force reduces, then surface of the work residual stress is less, and workpiece accuracy is higher, fatigue properties are better, and the vibration of cutter simultaneously can arrange the vestige of lathe tool processing, thus improves the surface quality of workpiece.This cutting process can reach with the effect of car generation mill, saves the grinding process in precision turning, significantly improve simultaneously crudy, cost-saving, reduce man-hour.
Therefore, need to design a kind of cutting tool that can produce three-dimensional elliptical vibration, to improve working (machining) efficiency, improve crudy.
Summary of the invention
The present invention makes to solve the above-mentioned technical problem that exists in prior art, its object is to provide a kind of cutting tool that can produce three-dimensional elliptical vibration.
To achieve these goals, the invention provides a kind of multipurpose vibrocutting cutter, it is characterized in that, comprising: be equipped with the cutter head of blade, submissive hinge that two structures are identical, two in the same way and the piezoelectricity fold stack driver be arranged in parallel and there is the pedestal of clamping part, the relative both sides of pedestal are respectively arranged with the groove for accommodating piezoelectricity fold stack driver, wherein, the upper surface that two submissive hinges are arranged on pedestal respectively make the lower surface of each submissive hinge compress with the upper surface of corresponding piezoelectricity fold stack driver respectively, the lower surface of cutter head is fixed on the upper surface of two the submissive hinges be arranged in parallel, and when the drive singal having certain difference to two piezoelectricity fold stack drivers applyings respectively makes cutter head vibrate, the oscillation trajectory of the point of a knife of blade is oval, clamping part has multipair clamping face, multipair clamping face comprises the first clamping face, when by the first clamping face clamping vibration cutting tool, the projection on the normal surface of cutting-in direction and cutting speed direction composition and on the normal surface of cutting-in direction and direction of feed composition of the oscillation trajectory of point of a knife is ellipse.
In addition, multipair clamping face also comprises: the second clamping face, when by the second clamping face clamping vibration cutting tool, the oscillation trajectory of point of a knife is be distributed in the ellipse on the normal surface of cutting-in direction and cutting speed direction composition, and the vibration of point of a knife only has component in cutting-in direction and cutting speed direction.
In addition, multipair clamping face also comprises: the 3rd clamping face, when by the 3rd clamping face clamping vibration cutting tool, the oscillation trajectory of point of a knife is be distributed in the ellipse on the normal surface of cutting-in direction and direction of feed composition, and the vibration of point of a knife only has oscillating component in cutting-in direction and direction of feed.
In addition, submissive hinge has backing plate and the alternately laminated structure of cushion block, and wherein, the length of cushion block is less than the length of backing plate, and each cushion block is clipped in the mid portion between two backing plates.
In addition, the second cushion block be arranged between submissive hinge and piezoelectricity fold stack driver is also comprised.
In addition, clamping part has the shape of positive six prisms.
In addition, clamping part has the shape of positive eight prisms.
Accompanying drawing explanation
By reference to following detailed description of the invention and claims content and by reference to the accompanying drawings, other object of the present invention and result will more be understood and should be readily appreciated that.In the accompanying drawings:
Figure 1A to Fig. 1 D is the view of the oval formation basic theory of multipurpose vibrocutting cutter of the present invention;
Fig. 2 is the oscillation trajectory figure obtained the emulation of multipurpose vibrocutting cutter of the present invention;
Fig. 3 is the stereogram of the structure of multipurpose vibrocutting cutter of the present invention;
Fig. 4 is the pedestal of multipurpose vibrocutting cutter of the present invention and the stereogram of piezoelectricity fold stack driver;
Fig. 5 is the stereogram of the submissive hinge of multipurpose vibrocutting cutter of the present invention;
Fig. 6 is the sectional view of multipurpose vibrocutting cutter of the present invention;
Fig. 7 is the stereogram of the pedestal of multipurpose vibrocutting cutter of the present invention;
Fig. 8 is the schematic diagram of cutting tool processing work of the present invention;
Fig. 9 be multipurpose vibrocutting cutter holding of the present invention on different clamping faces time oscillation trajectory distribution schematic diagram.
In the accompanying drawings, identical Reference numeral indicates similar or corresponding feature or function.
Detailed description of the invention
In the following description, for purposes of illustration, in order to provide the complete understanding to one or more embodiment, many details have been set forth.But, clearly, also these embodiments can be realized when there is no these details.In other example, one or more embodiment for convenience of description, known structure and equipment illustrate in block form an.
Come below with reference to accompanying drawings to be described in detail each embodiment according to the present invention.
The invention provides a kind of multipurpose vibrocutting cutter, this cutter makes cutter head produce elliptical vibration by the vibration of two piezoelectricity fold stack drivers.The generation principle of elliptical vibration of the present invention is as follows.
The setting of two piezoelectricity fold stack driver symmetries also supports cutter head two ends.Blade is fixed on cutter head, and vibrates along with the vibration of cutter head.By applying drive singal respectively to two piezoelectricity fold stack drivers, thus the oscillation trajectory of cutter head can be controlled.Figure 1A to Fig. 1 D respectively illustrates four kinds of states in elliptical vibration process.
If the drive singal of symmetrically arranged two piezoelectricity fold stack drivers is respectively:
y
1＝A
1sin(2πft)
Wherein A
1, A
2be respectively two drive singal y
1, y
2amplitude,
be two drive singal y
1, y
2phase angle difference, t is the time.
If y
1, y
2when being 0, the position of point of a knife is the origin of coordinates, and vertical direction is Y direction, and horizontal direction is X-direction, when two piezoelectric stacks export y respectively
1, y
2amplitude time, the coordinate of point of a knife (x ', y ') is:
x′＝-l
ysin(θ)
y′＝y
1+l
xsin(θ)+l
ycos(θ)-l
y
Wherein l
yfor the projector distance in Y-axis of the line segment between initial point and driving force application point, l
xfor projector distance in the line segment X-axis between initial point and driving force application point, θ is the deflection angle of point of a knife, then have:
θ＝sin
-1(y
2-y
1)/2l
x
Because deflection angle is usually very little, think sin (θ) ≈ θ so can be similar to.Assuming that A
1=1, A
2=1, then have
Above formula is the equation of circle, obviously,
time, oscillation trajectory is oval.Visible, when applying phase angle difference respectively to two piezoelectricity fold stack drivers be
drive singal y
1, y
2time, the point of a knife of blade can be made to produce elliptical vibration.Emulate the oscillation trajectory of the point of a knife of blade, result as shown in Figure 2.
Fig. 3 is the stereogram of the structure of multipurpose vibrocutting cutter of the present invention.As shown in Figure 3, multipurpose vibrocutting cutter of the present invention comprises: blade 1, the submissive hinge that cutter head 2, two structures are identical, two piezoelectricity fold stack drivers 6 (that is, the first electric fold stack driver and the second piezoelectricity fold stack driver) and pedestals 9.
Fig. 4 is the pedestal of multipurpose vibrocutting cutter of the present invention and the stereogram of piezoelectricity fold stack driver, and as shown in Figure 4, the both sides that the top of pedestal 9 is relative are respectively arranged with the first groove and the second groove, and the bottom of pedestal 9 is clamping part.Wherein, the first groove and the second groove towards identical direction, such as, the first groove and the substantial parallel vertical direction of the second groove, and pedestal 9 upper surface formed opening.First piezoelectricity fold stack driver and the second piezoelectricity fold stack driver are separately positioned in the first groove and the second groove, and the first piezoelectricity fold stack driver and the second piezoelectricity fold stack driver are in the same way and be arranged in abreast in two grooves.The upper surface of pedestal 9 is provided with the hole for fixing submissive hinge, and submissive hinge is arranged on pedestal 9 by the hole of screw 7 and pedestal 9 upper surface, but the present invention is not limited thereto.The lower surface of two submissive hinges compresses with corresponding piezoelectricity fold stack driver 6 respectively, and cutter head 2 is arranged on submissive hinge, thus cutter head can be vibrated by the driving of piezoelectricity fold stack driver 6.As mentioned above, when applying predetermined drive singal respectively to two piezoelectricity fold stack drivers 6, the point of a knife of blade 1 can produce elliptical vibration.Such as, respectively carrier phase shift is applied to a pair piezoelectricity fold stack driver 6
two drive singal y
1, y
2the point of a knife of blade 1 can be made to produce elliptical vibration.But the present invention is not limited only to use this drive singal to produce elliptical vibration.
As shown in Figure 1, the lower surface of cutter head 2 is fixed on the upper surface of two the submissive hinges be arranged in parallel, and particularly, the two ends, bottom of cutter head 2 are separately fixed on two submissive hinges.Two submissive hinges can be arranged on the upper surface of pedestal 9 abreast.
Referring to Fig. 5, describe the structure of submissive hinge in detail.Submissive hinge has backing plate 3 and the alternately laminated structure of the first cushion block 4.Particularly, first cushion block 4 is provided with between every two backing plates 3.As shown in Figure 5, the first cushion block 4 is arranged on the mid portion between two backing plates 3, and wherein, the length of the first cushion block 4 is less than the length of backing plate 3, and therefore, the two end portions between two backing plates 3 has the space of hollow.Two submissive hinges can be installed to pedestal 9 by the hole of the upper surface of pedestal 9.Such as, fixed component 8 (its thickness is identical with the first cushion block) can be set the two ends place between two backing plates 3, and be installed on pedestal 9 by screw 7.But the present invention is not limited thereto, can also use other fixed component of the prior art that submissive hinge is installed.When using fixed component 8 to install submissive hinge, should interval be had between the first cushion block 4 and fixed component 8, making the space between the first cushion block between two backing plates and fixed component 8 with hollow.First cushion block 4 and fixed component 8 can be considered as rigid body, their distortion is negligible.Because backing plate 3 thickness is little and exist between two backing plates 3 and do not have the hollow space of cushion block or fixed component; being subject to can bending (backing plate 3 there is no the hollow bulb office of cushion block bend) along backing plate 3 during driving force in Z-axis direction; due to the design of sandwich plate; make the rigidity of cutter head beyond driving direction much larger than the rigidity of driving direction, so piezoelectricity fold stack driver 6 can be protected not damaged when there is gear cutter or operating mistake.Shown in the drawings of submissive hinge, although there are two the first cushion blocks 4 of the present invention and be clipped in configuration between three layers of backing plate 3, the present invention is not limited thereto.Submissive hinge can have N number of first cushion block 4 be clipped in structure between N+1 layer backing plate 3 (N be more than or equal to 1 integer).Such as, submissive hinge can have first cushion block 4 and be clipped in structure between two-layer backing plate 3, or has three the first cushion blocks 4 and be clipped in structure between four layers of backing plate 3.Can stiffness as required, the quantity of the first cushion block 4 in each submissive hinge and backing plate 3 determined by the material of deformation quantity and backing plate 3.
The submissive hinge of vibrocutting cutter of the present invention only changes inefficacy part when keeping in repair, and dismantles and installs all very convenient, and piezoelectricity fold stack driver 6 can be protected when hitting cutter not damaged.
In addition, as shown in Figure 3, the second cushion block 5 can also being set between piezoelectricity fold stack driver 6 and submissive hinge, compressing for making the lower surface of the top of piezoelectricity fold stack driver 6 and submissive hinge.
Screw in compression can be passed through between backing plate 3 and the first cushion block 4 or fixed component 8.Preferably, while backing plate 3 and fixed component 8 can being compressed by screw 7, submissive hinge is installed on pedestal 9.Preferably, while backing plate 3 and the first cushion block 4 and the second cushion block 5 can being compressed by screw, cutter head 2 is arranged on submissive hinge.But the invention is not restricted to the above, can also by alternate manner of the prior art, submissive hinge and cutter head 2 are installed and compress backing plate 3 and cushion block.
Blade 1 is arranged on cutter head 2, as shown in Figure 1, cutter head 2 can be installed multiple blade 1, but the present invention is not limited thereto, and can select the structure of cutter head 2 and the quantity of blade 1 as required.In addition, cutter head 2 and blade 1 can use cutter head of the prior art and blade.
Fig. 7 is the stereogram of the pedestal of multipurpose vibrocutting cutter of the present invention.As shown in Figure 7, the clamping part of pedestal 9 has the shape of positive polygon prism, and has multipair clamping face a-a ', b-b ' and c-c '.When the clamping part of pedestal 9 is positive six prism, clamping angle can be 0 °, 60 °, 120 ° three kinds.Be retained as positive eight prisms when pedestal 9, clamping angle can be 0 °, 45 °, 90 ° three kinds.
Fig. 8 is the schematic diagram of cutting tool processing work of the present invention, and in figure, take point of a knife as the origin of coordinates, tool feeding direction is X-axis, and cutting-in velocity attitude is Y-axis, and cutter cutting-in direction is Z axis.
Fig. 9 be multipurpose vibrocutting cutter holding of the present invention on different clamping faces time oscillation trajectory distribution schematic diagram.During vibrocutting cutter of the present invention by a pair clamping in the multipair clamping face of pedestal 9, produce different processing effects.For the situation that the clamping part of pedestal 9 is positive eight prisms, the processing effect of vibrocutting cutter of the present invention is described.
As mentioned before, point of a knife vibrates in a different direction different effects, when by b-b ' clamping face (the first clamping face) clamping (being called 45 ° of clampings), the elliptical vibration track of point of a knife is positioned at XZ plane, track is ellipse in the projection in YZ, ZX face, namely point of a knife oscillation trajectory cutting-in direction and cutting speed direction composition normal surface on and cutting-in direction and direction of feed composition normal surface on projection be ellipse.Now, the oscillation trajectory of point of a knife is three-dimensional elliptical (all having oscillating component in X, Y, Z axis).That is, the vibration of point of a knife in cutting-in direction, all there is oscillating component in direction of feed and cutting speed direction.This three-dimensional elliptical vibrational energy reduces cutting force, frictional dissipation, improves surface quality simultaneously, is applicable to the Precision Machining of hard-cutting material.
When by a-a ' clamping face (the second clamping face) clamping (being called 0 ° of clamping), the elliptical orbit of point of a knife vibration is positioned at YZ plane, and namely the oscillation trajectory of point of a knife 1 is be distributed in the ellipse on the normal surface of cutting-in direction and cutting speed direction composition.Now, the vibration of point of a knife only has component in cutting-in direction and cutting speed direction.This elliptical vibration can suppress built-up edge to produce, and prevents chip to be wound around main shaft, reduces frictional heat and tool wear, be applicable to cut-out and the grooving of axial workpiece.
When by c-c ' clamping face (the 3rd clamping face) clamping (being called 90 ° of clampings), the elliptical vibration track of point of a knife is positioned at XZ plane, and namely the elliptical vibration track of point of a knife is be distributed in the ellipse on the normal surface of cutting-in direction and direction of feed composition.Now, the vibration of point of a knife only has oscillating component in cutting-in direction and direction of feed.This elliptic systems can improve suface processing quality, reduces surface roughness, is applicable to the cylindrical turning that Surface Quality requirement is higher.
Multipurpose vibrocutting cutter structure of the present invention is simple, can only use two piezoelectric stack devices to realize three-dimensional elliptical vibration.Because structure is simple, volume is little, the pedestal 9 of vibrocutting cutter of the present invention directly on lathe capstan head, and can not have gear cutter phenomenon by clamping.In addition, because structure is simply small and exquisite, multipurpose vibrocutting cutter first natural frequency of the present invention is higher than the vibration frequency of the cutting tool in conventional art, and therefore the operating frequency of cutter is higher.
Although disclosed content shows exemplary embodiment of the present invention above, it should be noted that under the prerequisite not deviating from the scope that claim limits, can multiple change and amendment be carried out.Need not perform with any particular order according to the function of the claim to a method of inventive embodiments described herein, step and/or action.In addition, although element of the present invention can describe or requirement with individual form, also it is contemplated that to have multiple element, is individual element unless explicitly limited.
Claims (6)
1. a multipurpose vibrocutting cutter, is characterized in that, comprising: be equipped with the cutter head of blade, submissive hinge that two structures are identical, two in the same way and the piezoelectricity fold stack driver be arranged in parallel and there is the pedestal of clamping part;
The relative both sides of described pedestal are respectively arranged with the groove for accommodating described piezoelectricity fold stack driver,
Wherein, the upper surface that two submissive hinges are arranged on described pedestal respectively make the lower surface of each submissive hinge compress with the upper surface of corresponding piezoelectricity fold stack driver respectively, the lower surface of described cutter head is fixed on the upper surface of two the submissive hinges be arranged in parallel, and when the drive singal having certain difference to two piezoelectricity fold stack drivers applyings respectively makes described cutter head vibrate, the oscillation trajectory of the point of a knife of described blade is oval
Described clamping part has multipair clamping face, described multipair clamping face comprises the first clamping face, when clamping described vibrocutting cutter by the first clamping face, the projection on the normal surface of cutting-in direction and cutting speed direction composition and on the normal surface of cutting-in direction and direction of feed composition of the oscillation trajectory of described point of a knife is ellipse.
2. vibrocutting cutter according to claim 1, is characterized in that, described multipair clamping face also comprises:
Second clamping face, when clamping described vibrocutting cutter by the second clamping face, the oscillation trajectory of described point of a knife is be distributed in the ellipse on the normal surface of cutting-in direction and cutting speed direction composition, and the vibration of described point of a knife only has component in cutting-in direction and cutting speed direction; And
3rd clamping face, when clamping described vibrocutting cutter by the 3rd clamping face, the oscillation trajectory of described point of a knife is be distributed in the ellipse on the normal surface of cutting-in direction and direction of feed composition, and the vibration of described point of a knife only has oscillating component in cutting-in direction and direction of feed.
3. vibrocutting cutter according to claim 1, is characterized in that, submissive hinge has backing plate and the alternately laminated structure of cushion block, and wherein, the length of cushion block is less than the length of backing plate, and each cushion block is clipped in the mid portion between two backing plates.
4. vibrocutting cutter according to claim 3, is characterized in that, also comprises the second cushion block be arranged between described submissive hinge and described piezoelectricity fold stack driver.
5. vibrocutting cutter according to claim 1, is characterized in that, described clamping part has the shape of positive six prisms.
6. vibrocutting cutter according to claim 1, is characterized in that, described clamping part has the shape of positive eight prisms.
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| CN201510411639.3A CN105033290B (en) | 2015-07-14 | 2015-07-14 | A kind of multipurpose vibrocutting cutter |
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|---|---|---|---|
| CN201510411639.3A CN105033290B (en) | 2015-07-14 | 2015-07-14 | A kind of multipurpose vibrocutting cutter |
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Cited By (5)
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|---|---|---|---|---|
| CN107414095A (en) * | 2017-09-06 | 2017-12-01 | 长春工业大学 | Parallel drive vibration auxiliary rotation truning fixture and method |
| CN109713936A (en) * | 2019-03-20 | 2019-05-03 | 杨晓峰 | Elliptical vibration piezoelectric actuator and its driving method |
| CN111496900A (en) * | 2020-04-27 | 2020-08-07 | 华中科技大学 | Flexible clamping device and method for providing uniform force and vibration cutting device |
| CN111673540A (en) * | 2020-06-19 | 2020-09-18 | 中国工程物理研究院机械制造工艺研究所 | Actual cutting-oriented diamond cutter cutting edge profile calculation method |
| CN116021229A (en) * | 2023-01-31 | 2023-04-28 | 清华大学 | Efficient processing device and method for columnar micro-nano texture with high aspect ratio of metal surface |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107414095A (en) * | 2017-09-06 | 2017-12-01 | 长春工业大学 | Parallel drive vibration auxiliary rotation truning fixture and method |
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| CN111496900A (en) * | 2020-04-27 | 2020-08-07 | 华中科技大学 | Flexible clamping device and method for providing uniform force and vibration cutting device |
| CN111496900B (en) * | 2020-04-27 | 2021-06-25 | 华中科技大学 | Flexible clamping device and method for providing uniform force and vibration cutting device |
| CN111673540A (en) * | 2020-06-19 | 2020-09-18 | 中国工程物理研究院机械制造工艺研究所 | Actual cutting-oriented diamond cutter cutting edge profile calculation method |
| CN116021229A (en) * | 2023-01-31 | 2023-04-28 | 清华大学 | Efficient processing device and method for columnar micro-nano texture with high aspect ratio of metal surface |
| CN116021229B (en) * | 2023-01-31 | 2024-04-09 | 清华大学 | Efficient processing device and method for columnar micro-nano texture with high aspect ratio of metal surface |
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|---|---|
| CN105033290B (en) | 2017-06-27 |
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