CN105563665B - Diamond-coated tools and preparation method and its application in graphite High-speed machining - Google Patents

Diamond-coated tools and preparation method and its application in graphite High-speed machining Download PDF

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CN105563665B
CN105563665B CN201510929588.3A CN201510929588A CN105563665B CN 105563665 B CN105563665 B CN 105563665B CN 201510929588 A CN201510929588 A CN 201510929588A CN 105563665 B CN105563665 B CN 105563665B
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graphite
diamond
cutting
angle
coated tools
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CN105563665A (en
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王成勇
周玉海
郑李娟
王启民
代伟
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Guangdong University of Technology
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Guangdong University of Technology
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B28WORKING CEMENT, CLAY, OR STONE
    • B28DWORKING STONE OR STONE-LIKE MATERIALS
    • B28D1/00Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
    • B28D1/18Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by milling, e.g. channelling by means of milling tools
    • B28D1/186Tools therefor, e.g. having exchangeable cutter bits
    • CCHEMISTRY; METALLURGY
    • C23COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23CCOATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C16/00Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
    • C23C16/22Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the deposition of inorganic material, other than metallic material
    • C23C16/26Deposition of carbon only
    • C23C16/27Diamond only
    • C23C16/271Diamond only using hot filaments

Abstract

The invention discloses diamond-coated tools and preparation method and its application in graphite High-speed machining, cutter of the present invention includes cutting tips, blade and clamping handle of a knife, clamping handle of a knife is hard alloy substrate, described cutting tips and blade are coated with diamond coatings on matrix material, it is characterised in that:The shear blade anterior angle γ o1 of blade are 2 °~6 °, and shear blade relief angle α 1 is 5 °~13 °, rake angle γ o2For 5 °~15 °, all edge clearance angle α2For 10 °~14 °, helixangleβ is 15 °~45 °.The present invention has the features such as hardness is high, wear-resistant, and coefficient of friction is small, and thermal conductivity is good, suitable for the High-speed machining of graphite, can effectively overcome fretting wear of the graphite dust to tool surface, is the preferable cutter of manufacture cutting graphite.

Description

Diamond-coated tools and preparation method and its application in graphite High-speed machining
Technical field
The present invention relates to field of machining, specially a kind of diamond-coated tools, its preparation method and its in graphite Application in High-speed machining.
Background technology
Isotropism cold isostatic pressing formed graphite has the mechanical and physical performance more excellent than common die-pressed graphite, and its particle is not selected Excellent orientation thus the ability such as intensity and conduction is all consistent in all directions, be one of most rapid industrial materials of world today's development. Isotropic graphite has higher elevated temperature strength, low thermal coefficient of expansion, preferable machinability and good heat, electrical conductivity, Heat-resisting quantity, stable chemical performance, plasticity, the advantages that good thermal shock.It is widely used in mould EDM spark discharges, too It is positive can graphite field, metallurgy, machinery, building, electrically, electronics, Aero-Space, nuclear industry, coloured and noble metal be industrial, glass and The field such as quartzy industrial, semiconductor and optoelectronics industry chemical industry and environmental project.Compared with copper, graphite electrode has intensity High, the advantages that thermal deformation and consumption of electrode are small, it is suitable for the electricity with the complex-shaped surface mould structure such as micropore, thin-walled and fin Pole, just progressively substitution copper electrode turns into electrical discharge machining main flow to graphite electrode.Such as in the electrical discharge machining in the U.S. more than 96% User makees electrode material from graphite, and in other industrially developed country such as Japan and country of Switzerland, graphite is in electrical discharge machining With also taking up main status in electrode material.
Graphite is typical layered structure fragile material, and mechanical strength is poor, easily collapses during processing broken, and tool wear is serious, For typical difficult-to-machine material.Car, milling, the mill of routine process the graphite parts that can only process simple shape, can not meet various multiple Miscellaneous shape electrode requirement.High-speed milling has process velocity is high, cutting force is small, temperature is low and workpiece surface quality is good etc. Feature, the electrode of complicated shape is processed to, is one of the main machining method of accurate complicated graphite electrode.
The microscopic defects such as the tissue defects of stomata, crackle and granule boundary inside heterogeneous graphite be present, for a kind of typical case Nonmetallic fragility friable material.Produced in working angles it is fine collapse flour dirt chip, easily bond be deposited in front and rear knife face and add On work surface, violent friction and impact are produced to cutting edge, causes cutter that early damage, Fast Wearing even tipping occurs and loses Effect, cutting force can be caused to steeply rise after tool wear passivation.Easily angle, chipping are collapsed when fragility graphite is impacted by cutting force very Phenomenon is scrapped to brittle fracture.Tool wear not only increases processing cost, and causes the surface quality for being difficult to ensure that workpiece And dimensional accuracy, generally, cutter accounts for more than the 1/3 of machining graphite totle drilling cost.So reduce tool wear improve processing efficiency and Workpiece quality, the problem of turning into graphite machining urgent need to resolve.
Graphite bite has hard alloy cutter, carbide alloy coating cutter, polycrystal diamond cutter etc..Hard alloy Tool wear is serious during cutter at high speeds milling graphite, and the life-span, which has no, during TiAlN coated cutting tool processing graphites significantly improves.Glomerocryst gold Diamond cutter wears the smaller but shape of tool and is difficult to meet complicated electrode requirement.Diamond-coated tools have high hardness and Wearability, low-friction coefficient, high elastic modulus, highly thermally conductive, low thermal coefficient of expansion and with nonferrous metal affinity it is small the advantages that.Can There is coloured gold for machining of non-metallic hard brittle material such as graphite, high abrasion resisting material, composite, silumin and other toughness Belong to the Precision Machining of material.
There are the relevant report of more diamond-coated tools in foreign countries, but are mainly towards ceramics, printed substrate, have coloured gold Category and its alloy, engineering plastics, non-metal stupalith, Al2O3The difficult-to-machine material processing such as floor and SiCp/Al, it is relevant to grind Diamond-coated tools processed and application with processing graphite in terms of document report it is fewer.Such as Yan Guoxiang, what Shen Fenglei write《Gold Hard rock coated cutting tool and its application in fibrous composite processing》The B of patent CN 102211218, are related to a kind of diamond Coated cutting tool and its cutter for composite processings such as carbon fiber or glass fibres, the cutter are not suitable for machining graphite.King What great waves were write《Diamond-coated tools are in printed substrate system obtained by the preparation method and this method of a kind of diamond-coated tools Application in standby》The A of patent CN 103397314, invention diamond-coated tools are in the application in printed substrate.Yan Guoxiang Write《Nano diamond coating cutter and its application in oral restoration Ceramic manufacturing》The A of patent CN 103770223, hair It is bright to be related to a kind of nano diamond coating cutter and its application in oral restoration Ceramic manufacturing.G.P. lattice granny rag etc. is write 《Diamond-coated tools and preparation method thereof》Patent CN1136292A describes the preparation method of diamond coatings blade, the knife Tool is not appropriate for manufacturing complex shapes graphite.What Zhang Tai write《Processing of the diamond-coated tools to precise and fine graphite electrodes Method》Patent CN201010234411.9 is related to a kind of processing method of diamond-coated tools to precise and fine graphite electrodes, Cutting Process parameter is mainly have studied, is not directed to the contents such as graphite cutting-tool angle optimization.
Some Enterprises also select the universal diamond-coated tools in cutter market during graphite High-speed machining at present, due to selecting Diamond-coated tools not designed specifically for graphite material High-speed machining characteristic, due to the shear blade of designed cutter Anterior angle, relief angle, rake angle, relief angle, and helix angle are difficult to meet that graphite material processes particular/special requirement.Actual use process In to occur frequently occurring diamond-coated tools most surfaces during diamond-coated tools High-speed machining graphite intact, but There is abrasion, disrepair phenomenon in advance in point of a knife or the other positions of cutting edge.Coated cutting tool angle design is unreasonable to be caused to process Graphite workpiece accuracy decline, whole branch cutter scraps and produces huge waste in advance.Relevant development graphite High-speed machining is special at present With diamond-coated tools also under test, in terms of tool matrix material, cutting-tool angle result and coating process also It is not mature enough cause it is expensive.Select appropriate graphite processing cutter material, cutter structure and angle, improve cutter life and The machinability of graphite machining is improved, presently relevant patent and document report are very few.
In summary, it is very few that diamond-coated tools report is developed specifically for graphite high-speed cutting processing at present, Machining graphite field is widely used that ordinary rigid alloy cutter, is not designed special specifically for machining graphite characteristic Use cutter.Tool wear is serious, it is necessary to check tool wear situation and frequently in time during hard alloy cutter high-speed milling graphite Change cutter, using limited in terms of large scale or accurate electrode machining, during TiAlN coated cutting tool processing graphites the life-span have no bright Aobvious to improve, polycrystal diamond cutter abrasion is smaller, but the shape of tool is difficult to meet complicated electrode requirement.For graphite cutter Speech, designs suitable geometric angle, helps to reduce cutting-impact and vibration, avoids in process graphite workpiece from collapsing broken, together When cutting-tool angle selection have direct influence to cutting force, cutting vibration and tool wear, so designing suitable knife It is angularly significant to have anterior angle, relief angle, helical angle.The optimization of cutter can be achieved to shorten the electrode manufacturing cycle, lifting production The product market competitiveness, whole graphite product manufacturing is had a major impact.
The content of the invention
It is an object of the invention to provide diamond-coated tools, its preparation method and application, consider tool wear, Cutting force and the influence of vibration, by optimizing the geometric angle of cutting tool, improve cutter entirety cutting ability.
The invention discloses diamond-coated tools, including cutting tips, blade and clamping handle of a knife, clamping handle of a knife is hard Alloy substrate, cutting tips and blade are coated with diamond coatings, the shear blade anterior angle γ o of blade on matrix material1For 2 °~ 6 °, shear blade relief angle α1For 5 °~13 °, rake angle γ o2For 5 °~15 °, all edge clearance angle α2For 10 °~14 °, helixangleβ is 15 ° ~45 °.
Further, the matrix material of described cutting tips and blade is the quality of Talide, wherein cobalt Percentage composition is no more than 6%;Vanadium carbide or titanium carbide or other mixture ratios are not higher than 1%.
Further, the thickness of described diamond coatings is 7~20 μm.
Wherein, if described cutting tips are provided with dry dust chip area in cutting direction.
Preferably, the shear blade anterior angle γ o of described blade1For 4 °, shear blade relief angle α1For 9 °, rake angle γ o2For 10 °, All edge clearance angle α2For 14 °, helixangleβ is 30 °.
Preferably, the roughness of described blade<0.8.
The invention also discloses the preparation method of diamond-coated tools, comprise the following steps:
S1. the hard alloy of appropriate graphite processing is selected:Talide is chosen, wherein amount containing cobalt is no more than 6%, Wherein the mixture ratio such as vanadium carbide or titanium carbide is not higher than 1%, only allows extremely trace iron Fe, vanadium V, nickel, chromium Cr etc. to add Add agent, between the particle diameter of material is 0.5~2 μm, hardness HRA92~93;
S2. hard alloy bar is molded:It is cylinder that the material that step S1 chooses is added into extrusion forming in bar forming machine;
S3. cylinder is processed:Blade and cutting tips, the bottom of blade are ground using five axle high-precision numerical control grinding centers Angle of cutting edge γ o1 are 2 °~6 °, and shear blade relief angle α 1 is 5 °~13 °, and rake angle γ o 2 are 5 °~15 °, and all edge clearance angle α 2 are 10 ° ~14 ° of helixangleβs are 15 °~45 °;
S4. coating pre-processes:Cobalt is removed and is passivated using acid solution pickling, then is cleaned with aqueous alkali in ultrasonic wave, Finally dry;
S5. HF CVD film forming:In the cavity of forvacuum, hydrocarbon gas and hydrogen are split by high temperature heated filament Solution, deposit thickness is 7~20 μm of diamond thin on the tool matrix that step S4 processing obtains.
Wherein, in step S5 HF CVD 1800 DEG C~2000 DEG C of temperature, the temperature control of hard alloy substrate is 800 DEG C~1000 DEG C.
The invention also discloses the application of diamond-coated tools, described diamond-coated tools are applied in graphite at a high speed In processing.Described graphite High-speed machining is the standby isotropic graphite electrode of isostatic pressing, graphite field processing, thin diamond The feed of membrane coat cutter is 3000~3200mm/min, the speed of mainshaft is 12000~17000rpm, radial direction cutting-in Rd= 0.5mm, axial cutting-in Ad=2mm, using climb cutting, cooling air mode process.
The present invention has the advantages that:
1st, the present invention helps to reduce cutting-impact and vibration, avoided processed by being set to the geometric angle of cutter Graphite workpiece collapses broken in journey, while the selection of cutting-tool angle has direct influence to cutting force, cutting vibration and tool wear: During using 2 °~6 ° of shear blade anterior angle, 5 ° of rake angle~15 ° of processing graphites, cutting edge roundness intensity is preferable, impact resistance and friction Performance is good.5 °~13 ° of shear blade relief angle, 10 °~14 ° of all edge clearance angles, it is ensured that cutting edge roundness intensity and cutting vibration stability.Adopt During with compared with 15 °~45 ° of low pitch angle, graphite workpiece is cut on same cutting edge simultaneously, improves Tool in Cutting efficiency, and knife Tool abrasion, cutting force and impulsive force are within cutter tolerance range.Deviate workpiece according to large helix angle resultant tool force direction is crossed The degree on surface is big, because graphite collapse it is broken and caused by cutting-impact aggravate, so as to cause tool wear, Milling Force and cutting vibration Increase.The present invention considers tool wear, cutting force and the influence of vibration, is tested by design science rational factor, optimization Anterior angle, relief angle and the helical angle geometric angle of shear blade and Zhou Ren to graphite cutting tool, improve cutter entirety cutting ability.
2nd, diamond film-coated tools hardness of the invention than TiAlN (2600~2800HV) and CBN (3400~ 4500HV) all high, high case hardness causes diamond-coated tools easily to cut hard crisp graphite, and can effectively overcome Fretting wear of the graphite dust to tool surface.Coefficient of friction I, which subtracts, reduces cutting force and cutting temperature, avoids diamond from applying Layer cutter can obtain high manufacturing accuracy and machined surface quality in oxidation or graphitization.
3rd, thermal conductivity factor is higher than ordinary rigid alloy cutter thermal conductivity factor, good heat conductivility to cutter of the present invention at room temperature Diamond-coated tools are made to export cutting heat rapidly, tool surface temperature is not influenceed by cutting temperature substantially.Elastic modulus E ratio Inserted tool is higher by half so that cutter has good cutting ability.Diamond thin has that hardness is high, wear-resistant, friction The features such as coefficient is small, and thermal conductivity is good, it is manufacture cutting graphite ideal material.
Brief description of the drawings
Fig. 1 is the dimensional structure diagram of the present invention.
Fig. 2 is enlarged diagram at Fig. 1 B.
Fig. 3 is the schematic front view of the present invention.
Fig. 4 is Fig. 3 A-A diagrammatic cross-sections.
Fig. 5 is enlarged diagram at Fig. 3 C.
Fig. 6 is the surface topography for the blade that ESEM shoots cutter of the present invention.
Fig. 7 is the cross-sectional morphology for the blade that ESEM shoots cutter of the present invention.
Fig. 8 is the diamond thin power spectrum at the A of cutter of the present invention in Fig. 7.
Fig. 9 is surface microstructure after tool sharpening graphite of the present invention.
Primary clustering symbol description:
1:Cutting tips, 2:Blade, 3:Clamping handle of a knife, 4:Dust chip area
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and examples The present invention is further elaborated.
As shown in Figure 1 and Figure 2, the invention discloses a kind of diamond-coated tools, including cutting tips 1, blade 2 and folder Handle of a knife 3 is held, clamping handle of a knife 3 is hard alloy substrate, and cutting tips 1 and blade 2 are coated with diamond coatings on matrix material. The matrix material of cutting tips 1 and blade 2 is Talide, and wherein the weight/mass percentage composition of cobalt is no more than 6%;Carbonization Vanadium or titanium carbide or other mixture ratios are not higher than 1%.The thickness of diamond coatings is 7-20 μm.Cutting tips 1 are along cutting Dry dust chip area 4 is provided with direction if cutting, is easy to graphite effectively to discharge the graphite powder that cutting is formed when cutting, is reduced disconnected Knife phenomenon, hence it is evident that reduce tool change time, improve processing efficiency.
In the present embodiment, diamond film coating layer flat-bottom milling cutter, overall length 60mm, the long 24mm of sword, 4 teeth, cutting tip diameter 6mm.Head diameter 2-10mm, concretely 2mm, 4mm, 6mm, the sizes such as 8mm, 10mm, as head diameter≤4mm, The a diameter of 4mm of shank;As head diameter > 4mm, shank diameter is identical with head diameter.Cutting edge keeps sharp, rake face light It is sliding, it is not allow for the influences such as burr, spring corner saw tooth, ripple and uses defect.Bottom land is smooth, smooth, be not allow for tool marks, oscillation mark, The substrate imperfections such as burnt burn.The roughness Ra of blade<0.8.The roughness of remainder is 0.8.
As seen in figures 3-5, the shear blade anterior angle γ o of blade1For 2 °~6 °, shear blade relief angle α1For 5 °~13 °, rake angle γ o2For 5 °~15 °, all edge clearance angle α2For 10 °~14 °, helixangleβ is 15 °~45 °.By table 1, three groups of cutting-tool angles are set.
Table 1.#1~#3 cutting-tool angle parameters
The setting of shear blade anterior angle, rake angle of the present invention makes cutting edge roundness intensity preferable, and the performance of impact resistance and friction is good. The setting of shear blade relief angle, all edge clearance angles ensure that cutting edge roundness intensity and cutting vibration stability.The setting of helical angle makes same Tool in Cutting efficiency is improved when cutting graphite workpiece on cutting edge simultaneously, and tool wear, cutting force and impulsive force are cutter Within tolerance range.
Specific description is done with regard to the preparation process of coated cutting tool of the present invention below.
S1. the hard alloy of appropriate graphite processing is selected:Talide is chosen, wherein amount containing cobalt is no more than 6%, Wherein the mixture ratio such as vanadium carbide or titanium carbide (VC, TiC) be not higher than 1%, only allow extremely trace iron Fe, vanadium V, nickel, The additives such as chromium Cr, between the particle diameter of material is 0.5~2 μm, hardness HRA92~93.Cutter material is for processing efficiency, processing Quality, processing cost and tool life influence very big.Cutter material is harder, and its wearability is better, and hardness is higher, and impact is tough Property is lower, and material is more crisp.For diamond coatings graphite cutter, it can suitably select the high amount containing cobalt of hardness slightly lower in selection.
S2. hard alloy bar is molded:It is cylinder that the material that step S1 chooses is added into extrusion forming in bar forming machine.
S3. cylinder is processed:Blade and cutting tips, the bottom of blade are ground using five axle high-precision numerical control grinding centers Angle of cutting edge γ o1, shear blade relief angle α 1, rake angle γ o 2, all edge clearance angle α 2, helixangleβ are prepared by the processing of the parameter of upper table 1.
S4. coating pre-processes:Cobalt is removed and is passivated using acid solution pickling, then is cleaned with aqueous alkali in ultrasonic wave, Finally dry.
S5. HF CVD film forming:In the cavity of forvacuum, hydrocarbon gas and hydrogen are split by high temperature heated filament Solution, deposit thickness is 7~20 μm of diamond thin on the tool matrix that step S4 processing obtains.The temperature of HF CVD 1800 DEG C~2000 DEG C, the temperature control of hard alloy substrate is at 800 DEG C~1000 DEG C.
Such as shown using cutting performance such as table 2 below made from above-mentioned preparation method:
The performance parameter of table 2.1#~3# cutters
As seen from the above table, through the cutter that is prepared of the present invention, thermal conductivity factor significantly improves (hard alloy cutter at room temperature Thermal conductivity factor is only 80~100.m-1.K-1).Good heat conductivility makes diamond-coated tools export cutting heat, cutter rapidly Surface temperature is not influenceed by cutting temperature substantially.Elastic modulus E, half is higher by than inserted tool so that cutter has good Cutting ability.The hardness of cutter of the present invention is all higher than TiAlN (2600~2800HV) and CBN (3400~4500HV), pole High case hardness causes diamond-coated tools easily to cut hard crisp graphite, and can effectively overcome graphite dust to cutter The fretting wear on surface.Coefficient of friction I, which subtracts, reduces cutting force and cutting temperature, avoid diamond-coated tools in oxidation or Person's graphitization, can obtain high manufacturing accuracy and machined surface quality.
Fig. 6 is tool surface diamond pattern after coating, and ESEM shows that the diamond is column diamond particles, is had There are good physics and mechanical property.Fig. 7 is the pattern of cutter transverse cross-sectional area, and ESEM shows diamond coatings thickness about For 7 μm, and hard alloy substrate and diamond are well combined.ESEM power spectrum such as Fig. 8 diamond-coated tools shows, The power spectrum of diamond cutter coating layer cross section is 100% pure carbon.
Cutter prepared by the present invention is mainly used in the production of graphite High-speed machining, particularly in standby each to same of isostatic pressing Property graphite electrode, in graphite field processing, the feeds of diamond film-coated tools is set for 3000~3200mm/min, master Rotating speed is 12000~17000rpm, radial direction cutting-in Rd=0.5mm, axial cutting-in Ad=2mm, using climb cutting, air cooling side Formula is processed.Fig. 9 is the microstructure of 2# cutter high-speed cutting graphite surfaces, as can be seen from the figure the smooth nothing of graphite surface Obvious damaged and chipping, ensure that the surface quality of graphite parts.Through experimental demonstration, cutter knife after 500 meters of cutting strokes Tool wear of the tool flank width is 0.01mm, and graphite table roughness Ra is 0.84 μm, is joined in identical cutting machines and technique Under said conditions, compared to ordinary rigid alloy cutter, the diamond coatings life-span improves 3~5 times, graphite surface Quality advance 30%.
Compared with normal diamond coated cutting tool, service life will be grown the present invention, can effectively overcome graphite dust to knife Have the fretting wear on surface, and process can be significantly reduced and reported because graphite thin-wall part collapses angle, chipping even brittle fracture Useless phenomenon.
The foregoing is only a preferred embodiment of the present invention, any one skilled in the art exists The invention discloses technical scope in, the change or replacement that can readily occur in should be all included within the scope of the present invention.

Claims (9)

  1. A kind of 1. preparation method of diamond-coated tools, it is characterised in that comprise the following steps,
    S1. the hard alloy of appropriate graphite processing is selected:Talide is chosen, the weight/mass percentage composition of wherein cobalt does not surpass Cross 6%, the weight/mass percentage composition of vanadium carbide or titanium carbide is not higher than 1%, only allows trace iron Fe, vanadium V, nickel, chromium Cr to add Agent, between the particle diameter of material is 0.5~2 μm, hardness HRA92~93;
    S2. hard alloy bar is molded:It is cylinder that the material that step S1 chooses is added into extrusion forming in bar forming machine;
    S3. cylinder is processed:Blade and cutting tips are ground using five axle high-precision numerical control grinding centers, before the shear blade of blade Angle γ o1 are 4 °, and shear blade relief angle α 1 is 9 °, rake angle γ o2For 10 °, all edge clearance angle α2For 14 °, helixangleβ is 30 °;
    S4. coating pre-processes:Cobalt is removed and be passivated using acid solution pickling, then is cleaned with aqueous alkali in ultrasonic wave, finally Dry;
    S5. HF CVD film forming:In the cavity of forvacuum, hydrocarbon gas and hydrogen are cracked by high temperature heated filament, Deposit thickness is 7~20 μm of diamond thin on the tool matrix that step S4 processing obtains.
  2. 2. the preparation method of diamond-coated tools as claimed in claim 1, it is characterised in that:HF CVD in step S5 1800 DEG C~2000 DEG C of temperature, the temperature control of hard alloy substrate is at 800 DEG C~1000 DEG C.
  3. 3. the application of diamond-coated tools prepared by preparation method as claimed in claim 1 or 2, it is characterised in that:It is described Diamond-coated tools apply in graphite High-speed machining.
  4. 4. the application of diamond-coated tools as claimed in claim 3, it is characterised in that:Described graphite High-speed machining for etc. Isotropic graphite electrode prepared by static pressure, graphite field processing, the feeds of diamond film-coated tools for 3000~ 3200mm/min, the speed of mainshaft be 12000~17000rpm, radial direction cutting-in Rd=0.5mm, axial cutting-in Ad=2mm, using suitable Milling, cooling air mode processing.
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