CN107511517B - A kind of graphite jig processing coating end mill(ing) cutter and preparation method thereof - Google Patents
A kind of graphite jig processing coating end mill(ing) cutter and preparation method thereof Download PDFInfo
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- CN107511517B CN107511517B CN201710860097.7A CN201710860097A CN107511517B CN 107511517 B CN107511517 B CN 107511517B CN 201710860097 A CN201710860097 A CN 201710860097A CN 107511517 B CN107511517 B CN 107511517B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C5/00—Milling-cutters
- B23C5/02—Milling-cutters characterised by the shape of the cutter
- B23C5/06—Face-milling cutters, i.e. having only or primarily a substantially flat cutting surface
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
- B23P15/28—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass cutting tools
- B23P15/34—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass cutting tools milling cutters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C2200/00—Details of milling cutting inserts
- B23C2200/16—Supporting or bottom surfaces
- B23C2200/165—Supporting or bottom surfaces with one or more grooves
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C2200/00—Details of milling cutting inserts
- B23C2200/32—Chip breaking or chip evacuation
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- Polishing Bodies And Polishing Tools (AREA)
- Cutting Tools, Boring Holders, And Turrets (AREA)
Abstract
本发明公开了一种加工该类石墨模具的专用涂层端铣刀及其制备方法，特点为：具有独特的底刃长度分布，1条长底刃通过端铣刀底面的圆心处，3条短底刃均不通过端铣刀底面的圆心处；底刃间留有足够的排屑空间，底刃前角、后角和切削刃螺旋角角度合理。拥有可同时保证涂层结合强度和切削刃强度的最优切削刃圆弧半径。端铣刀表层经过Murakami溶液和Caro混合酸溶液的酸碱两步化学预处理后，采用化学气相沉积法涂覆了底层强韧、表层光滑且膜厚均匀合理的微纳米复合金刚石薄膜。本发明的涂层端铣刀与传统硬质合金端铣刀相比，可满足手机玻璃对热弯石墨模具表面光洁度的使用要求，显著提升刀具的工作寿命和石墨模具的加工表面光洁度。
The invention discloses a special coated end mill for processing such graphite molds and a preparation method thereof. The short bottom edge does not pass through the center of the bottom surface of the end mill; there is enough space for chip removal between the bottom edges, and the rake angle, clearance angle and cutting edge helix angle of the bottom edge are reasonable. It has an optimal cutting edge radius that guarantees both the bond strength of the coating and the strength of the cutting edge. After the surface layer of the end mill was subjected to two-step chemical pretreatment with Murakami solution and Caro mixed acid solution, chemical vapor deposition was used to coat the micro-nano composite diamond film with a tough bottom layer, a smooth surface layer and a uniform and reasonable film thickness. Compared with the traditional cemented carbide end mill, the coated end mill of the present invention can meet the use requirements of mobile phone glass for the surface finish of the hot-bending graphite mold, and significantly improve the working life of the tool and the machining surface finish of the graphite mold.
Description
Technical field
The present invention relates to a kind of graphite jig processing coating end mill(ing) cutters and preparation method thereof, and in particular to one kind is for heat
The coating end mill(ing) cutter and preparation method thereof of curved processing mobile phone glass graphite jig processing, belongs to cutting tool technical field.
Background technique
In recent years, smart phone style continues to introduce new.As a big attraction, the Curved screen technical application of mobile phone is further
Extensively.A plurality of curved surface screen mobile phones have successfully come out and such as Samsung Galaxy S8/S8+, Vivo Xplay6 etc. by user
Consistent favor.According to reliable news, apple Apple8 mobile phone will also use Curved screen.Thus, it could be seen that curved surface screen mobile phone will become
One of the development trend of the following mobile phone, mobile phone curved surface panel glass have a vast market application prospect.
Now, the mainstream preparation process of mobile phone curved surface panel glass are as follows: the cutting stock on numerically-controlled machine tool, using oven, stone
Glass is first heated to softening point by the hot bendings such as black mold equipment and jig, formed by being freely bonded mold or die pressure at
The mode of type is come after fixing the 3D curvature of curved surface of glass, then is cooled to base.Wherein, graphite jig has excellent heat-resisting quantity
It can, be the key components and parts of hot bending mobile phone curved surface panel glass.Meanwhile the surface best bright finish of mobile phone glass is high, and cannot deposit
In cavity blemish point, this proposes harsh requirement to the machined surface quality of graphite jig.
However, conventional rigid alloy end mill(ing) cutter, during processing graphite mold, the easy Fast Wearing of cutting edge, graphite is cut
It is ineffective to consider chip removal to be worth doing, and machining graphite surface roughness and integrality are poor, are unable to satisfy requirement.Therefore, for stone
The special processing request of black mold, needs to develop wear-resisting, chip removal superior performance and the better novel graphite mold of processing quality is special
With planar ends milling cutter.
The processing plane finish of graphite jig and the chip removal characteristic of process cutter can pass through the cutting edge of end mill(ing) cutter
The wearability of the innovation realization of three-dimensional geometry, cutting tool can be realized by coating superhard diamond thin.
Chemical vapor deposition (Chemical Vapor Deposition, CVD) diamond thin has hardness height (9000
~10000HV), coefficient of friction is low, wearability is strong and the excellent machinery and tribological property such as surface chemistry inertia height.Due to heat
Wire chemical vapor deposition (Hot Filament CVD, HFCVD) method prepare diamond thin with equipment it is simple and easy to control, deposition effect
The advantages that rate is high, depositional area is big, processing cost is low, base shape is unrestricted, has obtained most in cutting tool field
Universal application.
By the literature search discovery to the prior art, Chinese utility model patent (205167262 U of CN) " is applied to
Diamond-coated tools in graphite High-speed machining " disclose the forward and backward angle of machining graphite diamond-coated tools shear blade, Zhou Ren
The range of degrees at forward and backward angle and helical angle, but to the shear blade length and chip space and Buddha's warrior attendant for being directly used in plane graphite milling
Depositing operation, coating layer thickness and the less description of machining graphite surface roughness of stone film.Chinese invention patent (CN
101905489 A) " processing method of the diamond-coated tools to close fine graphite electrodes " describe using sharpening processing drop
The method of the surface roughness of low diamond-coated tools, and this patent will enter from the tiny nano-diamond film of deposited particles
The surface roughness of hand reduction diamond-coated tools.
Summary of the invention
The purpose of the present invention is the surface quality requirements harsh to its hot bending graphite jig for mobile phone glass, develop one kind
Efficiently, good graphite jig processes private use plane end mill(ing) cutter.
The purpose of the present invention is what is be achieved through the following technical solutions:
A kind of graphite jig processing coating end mill(ing) cutter, including knife handle and containing the cutting tip of cutting edge, cutting edge by
Side edge and shear blade composition, which is characterized in that the shear blade includes the long shear blade and three for passing through end mill(ing) cutter bottom surface the center point
The short shear blade of item only end mill(ing) cutter bottom surface the center point is distributed in end mill(ing) cutter bottom surface, has chip space between long shear blade and short shear blade, cuts
The surface for cutting part has the micro-nano composite diamond film of deposition.
The diameter a of the end mill(ing) cutter be 6~8mm, total length e be 40~60mm, cutting tip length f be 8~
12mm, long shear blade length b are the 43%~47% of diameter a, and shear blade length c three short is the 31%~35% of diameter a, long bottom
Width of chip space d is the 18%~22% of diameter a between sword and short shear blade；Shear blade anterior angle γoIt is 3 °~7 °, shear blade relief angle αoIt is 4 °
~12 °, helixangleβ is 20 °~45 °, and the arc radius of shear blade is the 0.8%~3.2% of end mill(ing) cutter diameter.
The present invention also provides the preparation methods of the end mill(ing) cutter described in one kind:
A kind of preparation method of the end mill(ing) cutter, which is characterized in that described method includes following steps:
1) on five-shaft numerical control grinding machine, hard alloy bar sword is ground to the cutting edge and slot of end mill(ing) cutter according to the specification
Type,
Wherein, the preferred tungsten-cobalt series hard alloy (YG6) of hard alloy, amount containing cobalt 6%, about 1 micron of tungsten carbide particle diameter；
Then, end mill(ing) cutter is put into vertical rotating cutter paralysis facility and is passivated 2 hours, revolving speed 12r/min, cutter is blunt
Change the grounds travel in equipment as the mixed-abrasive of quartz sand and walnut powder, the mixing quality ratio of quartz sand and walnut powder is 2:
1,
2) cutting tip of end mill(ing) cutter is pre-processed:
20~30 minutes ultrasounds are carried out firstly, the cemented carbide substrate of cutting tip is immersed in Murakami solution
Cleaning, makes tungsten carbide (WC) the particle fragmentation on hard alloy surface layer, and be roughened matrix surface, then, by hard alloy substrate
It is immersed in Caro mixed acid solution and carries out 1~4 minute etching to remove the cobalt element on its surface layer；
Wherein, the ingredient of the Murakami solution is potassium hydroxide (KOH), the potassium ferricyanide (K3(Fe(CN)6)) and water
(H2O), quality proportioning KOH:K3(Fe(CN)6): H2O=1:1:8,
The ingredient of the Caro mixed acid solution is the concentrated sulfuric acid (H2SO4) and hydrogen peroxide (H2O2), volume proportion is
H2SO4: H2O2=1:8,
Then the ultrasonic cleaning through pure water and acetone, removes the impurity of matrix surface；
3) micro-nano compound Buddha's warrior attendant is deposited using the end mill(ing) cutter cutting tip surface of chemical vapour deposition technique after the pre-treatment
Stone film,
The bottom of the micro-nano composite diamond film is micron diamond film, and surface layer is nano-diamond film,
Micron diamond film layer with a thickness of 3~5 microns, about 2~4 microns of particle size；Nano-diamond film layer with a thickness of 2
~4 microns, particle size is less than 100 nanometers.
Preferably, the technological parameter of deposition of diamond thin films process are as follows: the deposition micron diamond stage, heated filament 6, often
Root long degree 100mm, 2800~3300w of power, air pressure 30torr, methane flow 30sccm, hydrogen flowing quantity 3000sccm, deposition 6
Hour；The deposition Nano diamond stage, heated filament 6, every root long degree 100mm, 2200~2600w of power, air pressure 20torr, methane
Flow 60sccm, hydrogen flowing quantity 3000sccm are deposited 4 hours.
Compared with existing conventional rigid alloy end mill(ing) cutter, the present invention has the advantage that
Mobile phone glass hot bending die processing special-purpose coat end mill(ing) cutter of the present invention has three short one long shear blades, bottom
Width of chip space accounting is high, and blade cutting edge arc radius is suitable, and surface coats wear-resisting and smooth micro-nano compound Buddha's warrior attendant
Stone film.In the process of graphite jig, which can effectively eliminate the tool marks of machining graphite plane, promote graphite mo(u)ld
The surface smoothness of tool, chip removal is smooth, cutter long working life, can effectively promote the processing effect of mobile phone glass hot bending graphite jig
Rate and machined surface quality.
Detailed description of the invention
Upon reading the detailed description of non-limiting embodiments with reference to the following drawings, other features of the invention,
Objects and advantages will be more obvious:
The schematic diagram of coating end mill(ing) cutter Fig. 1 of the invention
Wherein, 1- knife handle, 2- cutting tip, 3- long shear blade, the short shear blade of 4-, 5- chip space.
Coating end mill(ing) cutter shear blade partial schematic diagram Fig. 2 of the invention
Wherein, a- end mill(ing) cutter diameter, b- long shear blade length, the short shear blade length of c-, width of chip space between the long and short shear blade of d-.
The front view schematic diagram of Fig. 3 coating end mill(ing) cutter
α0Shear blade relief angle, γ0Shear blade anterior angle, β-helical angle, f- cutting tip length, e- end mill(ing) cutter total length.
The present invention relates to the microscopic appearances of coating end mill(ing) cutter surface diamond film by Fig. 4
Fig. 5 mobile phone glass hot bending graphite jig floor map
Fig. 6 mobile phone glass hot bending graphite jig schematic three dimensional views
Wherein, 1- graphite jig working face, 2- mobile phone glass hot bending cambered surface.
The present invention relates to the graphite jig finished surface information of end mill(ing) cutter by Fig. 7
The graphite jig finished surface information of Fig. 8 comparison end mill(ing) cutter
Specific embodiment
The present invention is described in detail combined with specific embodiments below.Following embodiment will be helpful to the technology of this field
Personnel further understand the present invention, but the invention is not limited in any way.
Embodiment 1
The appearance schematic diagram for the coating end mill(ing) cutter that the present embodiment uses is as shown in Figure 1 and Figure 2 and Figure 3, and diameter a is
6mm, total length e are 50mm, and cutting tip length is 8mm, and 3 short shear blade length is 2mm, and 1 long shear blade length is
2.82mm, wherein long shear blade passes through the center point of end mill(ing) cutter bottom surface, the center of circle of remaining 3 short shear blade equal no-go end milling cutter bottom surfaces
Place, the width of long and short shear blade centre chip space are 1.3mm, and shear blade anterior angle is 5 °, and shear blade relief angle is 7 °, and helical angle is 25 °.Knife
Has the hard alloy that substrate is amount containing cobalt 6%, wherein tungsten carbide particles sized is 1 micron.
End mill(ing) cutter after five-shaft numerical control grinding machine sharpening is placed in vertical rotating cutter paralysis facility with the revolving speed of 12r/min
Passivation 2 hours, the grounds travel of use are the mixed powders of quartz sand and walnut powder, and mixing quality ratio is 2:1, shear blade after passivation
Cutting edge arc radius is 10 μm.
Then, the cutter after passivation is put into Murakami solution and be cleaned by ultrasonic within 25 minutes, Murakami solution
Ingredient be potassium hydroxide (KOH), the potassium ferricyanide (K3(Fe(CN)6)) and water (H2O), quality proportioning KOH:K3(Fe
(CN)6): H2O=1:1:8.
Then, cutter is put into the ultrasonic erosion carried out in Caro mixed acid solution 1~4 minute, Caro mixed acid solution
Ingredient be the concentrated sulfuric acid (H2SO4) and hydrogen peroxide (H2O2), volume proportion H2SO4: H2O2=1:8.
Then, carbide end mill passes through the ultrasonic cleaning of pure water and acetone, to remove the impurity of matrix surface.
50 pretreated end mill(ing) cutters are put into the deposition that diamond thin is carried out in vacuum drying oven, the deposition work of use again
Skill parameter are as follows: deposition micron diamond pellicular stage, heated filament 6, every root long degree 100mm, power 2800w, air pressure 30torr,
Methane flow 30sccm, hydrogen flowing quantity 3000sccm are deposited 6 hours；The deposition nano-diamond film stage, heated filament 6, every
Length 100mm, power 2200w, air pressure 20torr, methane flow 60sccm, hydrogen flowing quantity 3000sccm are deposited 4 hours.
The surface microscopic topographic of micro-nano composite diamond coating end mill(ing) cutter obtained is as shown in Figure 4.
Then, the working face that the diamond coatings end mill(ing) cutter of acquisition is used for mobile phone glass hot bending graphite jig is processed
In, plane and the schematic three dimensional views difference of mobile phone glass hot bending graphite jig are as shown in Figure 5 and Figure 6.
The working face milling that graphite jig is carried out on high-speed numeric control engraving machine, using S-shaped feed, specific cutting parameter
Are as follows: revolving speed 12000r/min, X-direction feed rate 4000mm/min, Y-direction step pitch are 0.05mm, cutting-in 0.05mm.
It is related to the cutting service performance of end mill(ing) cutter more clearly to understand the invention, is all 6mm using diameter, 4
Shear blade, every shear blade are that the non-coated cemented carbide endmill of 2.2mm compares.
The roughness of graphite jig finished surface, the graphite mo(u)ld of end mill(ing) cutter of the present invention are investigated using white light interferometer
Has working face processing effect as shown in fig. 7, it is 211 nanometers that black, which investigates the roughness Ra of line, in the plane.Compare the stone of knife
Black mold work plane machining effect is as shown in figure 8, visible obvious tool marks in figure, and black investigates the roughness Ra of line and is in plane
293 nanometers.After process finishing, the shear blade of coating end mill(ing) cutter of the present invention has no noticeable wear, compares knife after the shear blade of knife
Surface wear amount has reached 0.2mm.
Embodiment 2
For the diameter for the coating end mill(ing) cutter that the present embodiment uses for 8mm, cutting tip length f is 8mm, possesses three short one long 4
Shear blade, long shear blade length are 4.1mm, and three short shear blade length is 2.48mm, wherein long shear blade passes through the circle of end mill(ing) cutter bottom surface
At the heart, the center point of remaining 3 short shear blade equal no-go end milling cutter bottom surfaces, the width of chip space between long shear blade and short shear blade is
1.36mm；Shear blade anterior angle is 7 °, and shear blade relief angle is 12 °, and helical angle is 45 °.After the end mill(ing) cutter passivation of diameter 8mm, shear blade is cut
Cutting sword arc radius is 20 μm.
Cemented carbide substrate is immersed in Murakami solution and be cleaned by ultrasonic within 30 minutes, hard alloy surface layer is made
Tungsten carbide (WC) particle fragmentation, and matrix surface is caused to be roughened.Then, hard alloy substrate is immersed in Caro mixed acid solution
The middle etching for carrying out 4 minutes is to remove the cobalt element on its surface layer.
Then, carbide end mill passes through the ultrasonic cleaning of pure water and acetone, to remove the impurity of matrix surface.
Micro-nano composite diamond film is deposited using the end mill(ing) cutter surface of chemical vapour deposition technique after the pre-treatment.Micron
Diamond film layer with a thickness of 5 microns, about 4 microns of particle size；Nano-diamond film layer with a thickness of 4 microns, particle
Size is less than 100 nanometers.
The cutting experiment of 8mm end mill(ing) cutter is carried out on digital-controlled carving machine, the isometric non-coating of 4 sword that comparison cutter is 8mm is hard
Matter alloy end mill(ing) cutter, the length of every shear blade are 3.2mm.The specific cutting parameter of cutting experiment are as follows: revolving speed 12000r/min, X
Direction feed rate 4000mm/min, Y-direction step pitch are 0.05mm, cutting-in 0.05mm.
After cutting experiment, using the machined surface quality of white light interferometer detection graphite jig, coating of the present invention
The machined surface roughness Ra of end mill(ing) cutter is 233 nanometers, and the machined surface roughness Ra for comparing cutter is 492 nanometers.
By examples detailed above as it can be seen that the present invention relates to coating end mill(ing) cutters compared with the isometric end mill(ing) cutter of the non-coating shear blade of tradition
The bright and clean diamond film coating layer of three long one short unique shear blades and its distribution of lengths and superhard wear can be effectively improved cutter
Abrasion resistance properties, promote the processed surface smoothness of graphite jig, and the graphite jig of processing is able to satisfy mobile phone glass hot bending process
Requirement.
Claims (2)
1. a kind of graphite jig processing coating end mill(ing) cutter, including knife handle and containing the cutting tip of cutting edge, cutting edge is by side
Sword and shear blade composition, shear blade include one by the only end mill(ing) cutter bottom surface center of circle of the long shear blade of end mill(ing) cutter bottom surface the center point and three
The short shear blade at place is distributed in end mill(ing) cutter bottom surface, has chip space between long shear blade and short shear blade, and the surface of cutting tip has deposition
Micro-nano composite diamond film；The diameter a of end mill(ing) cutter is 6~8mm, and total length e is 40~60mm, cutting tip length f
It is the 43%~47% of diameter a for 8~12mm, long shear blade length b, shear blade length c three short is the 31%~35% of diameter a,
Width of chip space d is the 18%~22% of diameter a between long shear blade and short shear blade；Shear blade anterior angle γoIt is 3 °~7 °, shear blade relief angle αo
It is 4 °~12 °, helixangleβ is 20 °~45 °, and the arc radius of shear blade is the 0.8%~3.2% of end mill(ing) cutter diameter, and feature exists
In the end mill(ing) cutter is prepared by the following method, and specific steps include:
1) on five-shaft numerical control grinding machine, hard alloy bar is sharpened out to the cutting edge and groove profile of end mill(ing) cutter, wherein hard alloy
For tungsten-cobalt series hard alloy, amount containing cobalt 6%, about 1 micron of tungsten carbide particle diameter；
Then, end mill(ing) cutter is put into vertical rotating cutter paralysis facility and is passivated 2 hours, revolving speed 12r/min, cutting tool dulling is set
Grounds travel in standby is the mixed-abrasive of quartz sand and walnut powder, and the mixing quality ratio of quartz sand and walnut powder is 2:1,
2) cutting tip of end mill(ing) cutter is pre-processed:
Be cleaned by ultrasonic within 20~30 minutes firstly, the cemented carbide substrate of cutting tip is immersed in Murakami solution,
Make tungsten carbide (WC) the particle fragmentation on hard alloy surface layer, and be roughened matrix surface, then, hard alloy substrate is immersed in
1~4 minute etching is carried out in Caro mixed acid solution to remove the cobalt element on its surface layer；
Wherein, the ingredient of the Murakami solution is potassium hydroxide (KOH), the potassium ferricyanide (K3(Fe(CN)6)) and water (H2O),
Its quality proportioning is KOH:K3(Fe(CN)6): H2O=1:1:8,
The ingredient of the Caro mixed acid solution is the concentrated sulfuric acid (H2SO4) and hydrogen peroxide (H2O2), volume proportion H2SO4: H2O2
=1:8,
Then the ultrasonic cleaning through pure water and acetone, removes the impurity of matrix surface；
3) thin using the end mill(ing) cutter cutting tip surface micro-nano composite diamond of deposition of chemical vapour deposition technique after the pre-treatment
Film,
The bottom of the micro-nano composite diamond film is micron diamond film, and surface layer is nano-diamond film, micron
Diamond film layer with a thickness of 3~5 microns, about 2~4 microns of particle size；Nano-diamond film layer with a thickness of 2~4
Micron, particle size is less than 100 nanometers.
2. graphite jig processing coating end mill(ing) cutter as described in claim 1, which is characterized in that the preparation of the end mill(ing) cutter walks
It is rapid 3) in, the technological parameter of deposition of diamond thin films process are as follows: deposition the micron diamond stage, heated filament 6, every root long degree
100mm, 2800~3300w of power, air pressure 30torr, methane flow 30sccm, hydrogen flowing quantity 3000sccm are deposited 6 hours；
The deposition Nano diamond stage, heated filament 6, every root long degree 100mm, 2200~2600w of power, air pressure 20torr, methane flow
60sccm, hydrogen flowing quantity 3000sccm are deposited 4 hours.
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| US6991409B2 (en) * | 2002-12-24 | 2006-01-31 | Niagara Cutter | Rotary cutting tool |
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2017
- 2017-09-21 CN CN201710860097.7A patent/CN107511517B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103025461A (en) * | 2010-05-27 | 2013-04-03 | 京瓷株式会社 | end mill |
| CN103635277A (en) * | 2011-07-05 | 2014-03-12 | Osg株式会社 | Variable lead end mill |
| CN203936446U (en) * | 2014-07-21 | 2014-11-12 | 哈尔滨理工大学 | The milling cutter of processing carbon fibre composite |
| CN105382317A (en) * | 2014-08-22 | 2016-03-09 | 钴碳化钨硬质合金公司 | Asymmetric end mills and applications thereof |
| CN204975470U (en) * | 2015-09-18 | 2016-01-20 | 浙江新信峰工具有限公司 | Milling cutter is found in crisscross tooth shaping |
| CN105563665A (en) * | 2015-12-14 | 2016-05-11 | 广东工业大学 | Diamond coating cutter, and preparation method and application thereof in high speed graphite processing |
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| CN107511517A (en) | 2017-12-26 |
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