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 PDF

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Publication number
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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cutter
mill
ing
shear blade
deposition
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CN107511517A (en
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雷学林
何云
刘晋
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East China University of Science and Technology
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East China University of Science and Technology
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23CMILLING
    • B23C5/00Milling-cutters
    • B23C5/02Milling-cutters characterised by the shape of the cutter
    • B23C5/06Face-milling cutters, i.e. having only or primarily a substantially flat cutting surface
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23PMETAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • B23P15/28Making specific metal objects by operations not covered by a single other subclass or a group in this subclass cutting tools
    • B23P15/34Making specific metal objects by operations not covered by a single other subclass or a group in this subclass cutting tools milling cutters
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23CMILLING
    • B23C2200/00Details of milling cutting inserts
    • B23C2200/16Supporting or bottom surfaces
    • B23C2200/165Supporting or bottom surfaces with one or more grooves
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23CMILLING
    • B23C2200/00Details of milling cutting inserts
    • B23C2200/32Chip breaking or chip evacuation

Abstract

The invention discloses a kind of special-purpose coat end mill(ing) cutter and preparation method thereof for processing such graphite jig, features are as follows: has unique shear blade distribution of lengths, 1 long shear blade passes through the center point of end mill(ing) cutter bottom surface, the center point of 3 short shear blade equal no-go end milling cutter bottom surface;There are enough chip spaces between shear blade, shear blade anterior angle, relief angle and cutting edge helix angle are reasonable.Possess the optimal cutting edge arc radius that can guarantee anchoring strength of coating and edge strength simultaneously.End mill(ing) cutter surface layer is coated with that bottom is tough, surface layer is smooth after the two step chemical pretreatment of soda acid of Murakami solution and Caro mixed acid solution, using chemical vapour deposition technique and the reasonable micro-nano composite diamond film of uniform film thickness.Coating end mill(ing) cutter of the invention can meet mobile phone glass to the requirement of hot bending graphite mold surface finish, be obviously improved the working life of cutter and the processed surface smoothness of graphite jig compared with conventional rigid alloy end mill(ing) cutter.

Description

A kind of graphite jig processing coating end mill(ing) cutter and preparation method thereof
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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CN109397549B (en) * 2018-09-26 2020-08-28 广东工业大学 Diamond-coated silicon nitride ceramic integral cutter, preparation method thereof and application of cutter in graphite
CN109482948B (en) * 2018-11-12 2020-02-14 西北工业大学 In-situ self-generated TiB2Ultrasonic vibration auxiliary processing method for particle reinforced aluminum matrix composite material
WO2020102924A1 (en) * 2018-11-22 2020-05-28 广东工业大学 Zirconia ceramic solid tool and manufacturing method therefor, and use of tool in graphite

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Inventor after: Lei Xuelin

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Inventor before: He Yun

Inventor before: Liu Jin

CB03 Change of inventor or designer information