CN117840496A - Milling cutter for machining ceramic matrix composite parts and preparation method - Google Patents
Milling cutter for machining ceramic matrix composite parts and preparation method Download PDFInfo
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- CN117840496A CN117840496A CN202311838746.5A CN202311838746A CN117840496A CN 117840496 A CN117840496 A CN 117840496A CN 202311838746 A CN202311838746 A CN 202311838746A CN 117840496 A CN117840496 A CN 117840496A
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- 238000003754 machining Methods 0.000 title claims abstract description 53
- 238000003801 milling Methods 0.000 title claims abstract description 46
- 239000011153 ceramic matrix composite Substances 0.000 title claims abstract description 42
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 238000005520 cutting process Methods 0.000 claims abstract description 220
- 238000003466 welding Methods 0.000 claims abstract description 19
- 238000000034 method Methods 0.000 claims abstract description 16
- 239000000463 material Substances 0.000 claims abstract description 15
- 238000000227 grinding Methods 0.000 claims abstract description 14
- 239000000843 powder Substances 0.000 claims abstract description 13
- 229910052582 BN Inorganic materials 0.000 claims abstract description 12
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 claims abstract description 12
- 238000005245 sintering Methods 0.000 claims abstract description 12
- 239000002131 composite material Substances 0.000 claims abstract description 11
- 239000000919 ceramic Substances 0.000 claims abstract description 8
- 239000013078 crystal Substances 0.000 claims abstract description 6
- GJNGXPDXRVXSEH-UHFFFAOYSA-N 4-chlorobenzonitrile Chemical compound ClC1=CC=C(C#N)C=C1 GJNGXPDXRVXSEH-UHFFFAOYSA-N 0.000 claims abstract 3
- 239000010432 diamond Substances 0.000 claims description 23
- 229910003460 diamond Inorganic materials 0.000 claims description 23
- 238000005219 brazing Methods 0.000 claims description 7
- 239000011159 matrix material Substances 0.000 claims description 7
- 239000000956 alloy Substances 0.000 claims description 6
- 230000002093 peripheral effect Effects 0.000 claims description 6
- 238000004663 powder metallurgy Methods 0.000 claims description 6
- 239000011230 binding agent Substances 0.000 claims description 5
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 5
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 claims description 5
- 239000000945 filler Substances 0.000 claims description 4
- 150000002739 metals Chemical class 0.000 claims description 4
- 239000002994 raw material Substances 0.000 claims description 4
- 238000010892 electric spark Methods 0.000 claims description 3
- 238000002844 melting Methods 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- 238000005056 compaction Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 2
- 239000007767 bonding agent Substances 0.000 abstract description 4
- 239000002173 cutting fluid Substances 0.000 abstract description 4
- LKPLKUMXSAEKID-UHFFFAOYSA-N pentachloronitrobenzene Chemical compound [O-][N+](=O)C1=C(Cl)C(Cl)=C(Cl)C(Cl)=C1Cl LKPLKUMXSAEKID-UHFFFAOYSA-N 0.000 abstract description 2
- 238000002156 mixing Methods 0.000 abstract 1
- 239000000835 fiber Substances 0.000 description 7
- 238000005299 abrasion Methods 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 238000002679 ablation Methods 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000004323 axial length Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000032798 delamination Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000035929 gnawing Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 239000011226 reinforced ceramic Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000010408 sweeping Methods 0.000 description 1
Classifications
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Polishing Bodies And Polishing Tools (AREA)
Abstract
The invention relates to a milling cutter for machining ceramic matrix composite parts, which comprises a cutter body and cutting blades, wherein the cutter body is cylindrical, the cutting blades are fixed in chip grooves, and the cutting blades are fixed in a welding mode and comprise diamond-shaped cutting blades and triangular cutting blades. The invention also relates to a preparation method of the milling cutter for machining the ceramic matrix composite part, which comprises the processes of chip groove grinding, cutting blade cutting, cutting blade fixing and cutting blade grinding. The invention also relates to a preparation method of the milling cutter cutting piece blank for machining the ceramic matrix composite part, and the PCBN cutting piece blank is obtained by mixing, compacting and sintering the bonding agent and the cubic boron nitride single crystal powder. The milling cutter provided by the invention has the advantages that the PCNB material is adopted as the cutting blade, so that the milling cutter is suitable for dry cutting and high-speed cutting of ceramic-based composite parts, the use of cutting fluid is reduced, the processing efficiency is improved, burrs, layering and tearing are reduced, and the surface quality of a machined part is improved.
Description
Technical Field
The invention belongs to the technical field of ceramic matrix composite part machining, and particularly relates to a milling cutter for machining a ceramic matrix composite part and a preparation method thereof.
Background
The ceramic matrix composite is a novel thermal structure/function integrated strategic material with the performance advantages of metal materials, ceramic materials and carbon materials, has the characteristics of high temperature resistance, low density, high specific strength, high specific modulus, oxidation resistance, ablation resistance, insensitivity to cracks, no catastrophic damage and the like, and has wide application in the fields of aviation, aerospace, satellite aerospace, nuclear energy, photovoltaics and the like.
Because of the influence of the high strength, high hardness, high wear resistance and high toughness of the ceramic matrix composite, the conventional metal cutter is difficult to process the material part, and diamond coating cutters, polycrystalline diamond cutters (PCD cutters) and polycrystalline cubic boron nitride cutters (PCBN cutters) are mainly adopted to remove redundant materials of the parts. However, the machining of the above cutters is essentially to grind redundant materials of ceramic matrix composite parts, and the cutter is worn too fast and ceramic matrix composite fibers are not easy to break completely due to the structural characteristics of the cutter in the machining process, so that phenomena of burrs, tearing, gnawing and even layering occur. Therefore, the method has important significance for meeting the requirements of the machining precision and the machining quality of ceramic matrix composite parts and solving the problems of too fast cutter abrasion, high machining difficulty, low machining quality of the surface of the material and the like in the machining process.
The Chinese patent publication No. CN112976357A discloses a milling cutter for fiber reinforced ceramic matrix composite and a preparation method thereof. The cutter adopts hard alloy to grind the cutter body, and opens a cutter slot and a chip groove at one side far away from the cutter handle, then cuts the PCD blade into a required shape and size, and welds the PCD blade in the cutter slot in a staggered manner by adjacent cutter slots. The cutter manufactured by the method disperses the cutting edge into a plurality of small cutting edges, reduces cutting force, reduces cutter abrasion condition, and meanwhile, the axial inclination angles of the milling blade groups at the bottom are opposite, and the directions of the generated axial cutting force are opposite, so that the axial cutting force can offset each other, and layering defects can be restrained. However, when the cutter prepared by the method cuts the fiber layer on the next layer, the discrete cutting edge corner points can hook the ceramic fibers, and further increase fiber burrs and tearing. And aiming at the ceramic matrix composite which is not suitable for cooling processing by adopting cutting fluid or the modified ultrahigh-hardness ceramic matrix composite, the service life of the cutter provided by the method can be obviously shortened, the temperature of the cutting edge is easy to be rapidly increased and ablated, the fiber of the ceramic matrix composite is easily oxidized due to the increase of the processing temperature, and the mechanical property of the ceramic matrix composite is attenuated.
Disclosure of Invention
In order to overcome the defects of short service life of the milling cutter and burrs, tearing and layering of ceramic fibers when a component is machined, the invention provides a milling cutter for machining ceramic matrix composite parts and a preparation method.
The technical scheme adopted for solving the technical problems is as follows:
a milling cutter for machining ceramic matrix composite parts comprises a cutter body and cutting blades.
The cutter body is of a diameterThe cylindrical cutting tool is characterized in that the clamping end is cylindrical, chip grooves are formed in the cutting end, 4 chip grooves are formed in the chip grooves, and the 4 chip grooves are uniformly distributed along the circumference of the cutting end.
The chip removal groove is matched with the cutting blade, and the cutting blade is fixed in the chip removal groove. The surface of the fixed cutting blade where the chip groove is located is not parallel to the central axis of the cutter body, and the included angle is a set inclined angle theta.
The cutting blades are fixed in the chip grooves of the cutter body in a welding mode.
The cutting blade is cuboid-shaped slice, and both sides are provided with cutting edge portion, and cutting edge portion includes end tooth cutting edge, week tooth cutting edge, and end tooth cutting edge is located the bottom periphery of cutter body cutting end, and week tooth cutting edge is located the periphery of cutter body cutting end. The cutting blades are arranged in two groups, the thickness of the two groups is equal, each group is provided with two, one group is a diamond-shaped cutting blade, and the other group is a triangular cutting blade, and the diamond-shaped cutting blades and the triangular cutting blades are arranged at intervals.
The diamond-shaped cutting blade is of an integral structure and can be divided into a diamond-shaped cutting matrix and a diamond-shaped cutting edge part, wherein the diamond-shaped cutting edge part is a diamond array, the bottom surface of each diamond of the diamond array is connected with the diamond-shaped cutting matrix, the bottom surface of each diamond is square, the diagonal length of the square of the bottom surface is the thickness of the diamond-shaped cutting blade, and the height of the diamond-shaped cutting edge part is
The triangular cutting blade is of an integral structure and can be divided into a triangular cutting matrix and a triangular cutting edge part, the cross section of the triangular cutting edge part is triangular, and the length of the bottom edge of the triangle is the thickness of the triangular cutting blade. The front axial inclination angle and the back axial inclination angle are both 30-45 degrees, and the front axial inclination angle and the back axial inclination angle can be equal.
The milling cutter for machining the ceramic matrix composite part is characterized in that the cutter body is made of Co-containing tungsten carbide hard alloy.
The milling cutter for machining the ceramic matrix composite part is characterized in that the cutting blade is made of Polycrystalline Cubic Boron Nitride (PCBN) material.
The inclination angle theta of the milling cutter for machining the ceramic matrix composite part is 3-5 degrees.
The thickness D of the cutting blade of the milling cutter for machining the ceramic matrix composite part is 0.5-1.2 mm.
The preparation method of the milling cutter for machining the ceramic matrix composite part comprises the following steps:
step one, chip groove grinding
The method is characterized in that round bar-shaped hard alloy materials are selected as cutter body materials, diamond grinding wheels are adopted to grind chip grooves at the cutting ends of the cutter body, the number of the chip grooves is 4, and the chip grooves are uniformly distributed at the cutting ends of the cutter body.
Step three, cutting the cutting blade
And cutting the cutting piece blank by adopting electric spark cutting according to the size requirements of the diamond-shaped cutting piece and the triangular cutting piece, and reserving machining allowance of a cutting edge part when cutting to obtain the cutting piece raw material.
Step four, fixing the cutting blade
And fixing the cutting blade raw materials at the set positions of the chip grooves in a welding mode.
Step five, grinding the cutting edge part
And respectively grinding an end tooth cutting edge and a peripheral tooth cutting edge according to the size requirements of the edge parts of the diamond tooth cutting blade and the triangular cutting blade until the cutting edge parts meet the set size requirements, and obtaining the milling cutter for machining the ceramic matrix composite parts.
The method for preparing the milling cutter for machining the ceramic matrix composite part comprises the following steps:
the welding mode is vacuum brazing, 70% of Ag and 30% of Cu are used as brazing filler metals in the welding mode, and the melting time of the brazing filler metals is not more than 15s in the welding process.
A method for preparing milling cutter cutting piece blank for machining ceramic matrix composite parts adopts powder metallurgy sintering to prepare cutting piece blank, co, al, tiC powder is taken as a bonding agent, the bonding agent and cubic boron nitride single crystal powder are uniformly mixed and compacted, and sintering is carried out in powder metallurgy sintering equipment to obtain polycrystalline cubic boron nitride PCBN cutting piece blank.
According to the preparation method of the milling cutter cutting piece blank for machining the ceramic matrix composite part, the mass ratio of the cubic boron nitride single crystal powder to the bonding agent is 7:3, the mass ratio of Co, al and TiC powder is 1:1:1. the sintering temperature of the powder metallurgy sintering is 1450 ℃, and the compaction pressure is 6GPa.
The beneficial effects of the invention are as follows:
the milling cutter for machining ceramic base composite parts adopts PCNB material, is suitable for dry cutting machining of ceramic base composite parts, reduces the use of cutting fluid, is especially suitable for machining ceramic base composite materials in a non-aqueous oxygen medium environment, and reduces the machining cost of the parts.
A milling cutter for machining ceramic-based composite parts has larger size, higher linear speed in machining, suitability for rapid cutting machining with larger cutting load, and stronger wear resistance of PCBN material, and is suitable for high-speed cutting of parts, thereby further improving machining efficiency.
A milling cutter for machining ceramic-base composite parts adopts a triangular cutting blade cutting edge part, when milling is carried out, cutting force borne by the machined surface of the ceramic-base composite parts can be generated along the front-back axial inclination angle of the designed cutting edge part, so that the cutting force is offset, phenomena of burrs, layering, tearing and the like in the ceramic-base composite part machining process are greatly reduced, and the surface quality of workpiece machining is improved.
A milling cutter for machining ceramic-base composite material parts features that its cutting edge has multiple cutting edges for cutting, so decreasing the unit cutting force, slow abrasion and high durability.
When the diamond-shaped cutting blades and the triangular cutting blades are matched for use, the two cutting blades alternately process a workpiece, a large amount of the diamond-shaped cutting blades are removed firstly, then the triangular cutting blades are used for polishing, the durability of the cutter is greatly improved, the generated cuttings are in a fine powder shape, and the cuttings are discharged through the chip grooves and cannot interfere with or scratch the surface of the workpiece or impact the cutter.
The preparation method of the milling cutter for machining ceramic matrix composite parts uses 10% Co, 10% Al and 10% TiC as binding agents of CBN powder, can effectively improve the hardness and wear resistance of cutting blades, and simultaneously enables the welded PCBN cutting blades and Co-containing tungsten carbide hard alloy cutter bodies to have better heat transfer performance.
Drawings
FIG. 1 is a schematic view of a milling cutter according to the present invention;
fig. 2 is a perspective view of a diamond-shaped cutting blade;
FIG. 3 is a schematic view of a tooth construction of a tooth cutting blade;
fig. 4 is a perspective view of a triangular cutting blade;
FIG. 5 is a normal cross-sectional view of a triangular cutting blade;
FIG. 6 is a bottom view of the milling cutter of the present invention;
fig. 7 is a front view of the milling cutter according to the present invention.
In the figure: 1. chip groove, 2, diamond-shaped cutting blade, 3, triangle cutting blade, 4, end tooth cutting edge, 5, peripheral tooth cutting edge, 100, cutter body, 200, cutting blade.
Detailed Description
Example 1
As shown in fig. 1 to 7, a milling cutter for machining ceramic matrix composite parts mainly includes a cutter body 100 and cutting blades 200.
As shown in fig. 1, the cutter body 100 is made of a tungsten carbide cemented carbide containing Co, the diameter of the cutter body of the present embodiment is 10mm, and the cutter body is divided into two sections, namely a cutter body portion for clamping and a cutting portion for welding cutting blades, and four chip grooves 1 with inclination angles are provided in the cutting portion of the cemented carbide cutter body 100.
As shown in fig. 7, the inclination angle θ between the chip groove and the axis of the cutter body in this embodiment is 3 °, and setting a certain inclination angle can reduce axial force and reduce delamination defects during milling of the part. Each chip groove 1 is welded with one cutting blade 200, and the cutting blade 200 is made of PCBN (polycrystalline cubic boron nitride), has higher hardness and strength, is suitable for dry cutting processing of parts, reduces the use of cutting fluid, and is suitable for ceramic matrix composite processing in a non-aqueous oxygen medium environment. Since the linear expansion coefficient and density of the two materials of the cutting blade 200 and the cutter body 100 are different, the PCBN cutting blade thickness D of the present embodiment is set to 0.6mm in order to ensure heat transfer therebetween and workability of the cutting blade 200.
The PCBN cutting blades 200 are divided into two groups, one group is a diamond-shaped cutting blade 2, the other group is a triangular cutting blade 3, each group is two, and the two cutting blades of each group are arranged at intervals, and the interval is 180 degrees. As shown in fig. 6, the end tooth cutting edge 4 and the peripheral tooth cutting edge 5 of the tool are formed by extending two types of blade cutting edge portions on the bottom end face of the tool body 100 in the direction normal to the axis of the tool body.
As shown in fig. 2 and 3, the cutting edge of the diamond-shaped cutting blade 2 is formed by diamond teeth arrayed along the inclination direction of the chip groove from the bottom end of the cutter body, the axial length d1 of the diamond teeth is 0.6mm, the radial length d2 of the diamond teeth is 0.6mm, the tooth tip height h of the diamond teeth is 0.4mm, the cutting edge of the diamond-shaped cutting blade has a plurality of edges to participate in milling, the unit cutting force can be obviously reduced, the abrasion of the cutter is slower, the durability of the cutter is improved, and simultaneously the cutting resultant force of a plurality of surfaces points to the inside of a workpiece to be processed rather than the surface of the workpiece along the axial inclination angle, so that the generation of burrs on the surface of the workpiece can be effectively inhibited.
As shown in fig. 4 and 5, the cutting edge of the triangular cutting blade 3 is formed by a triangle sweeping along the inclination direction of the chip groove, the length d3 of the triangle base of the embodiment is 0.6mm, the range of the front-rear axial inclination angle is between 30 degrees and 45 degrees, when a harder material is cut, the front angle is reduced by a small angle, and the rigidity of the cutting edge can be improved, so that the front-rear axial inclination angles lambda 1 and lambda 2 of the embodiment are both set to 30 degrees, and the cutting forces applied to the processed surface of the part can be generated along the designed front-rear axial inclination angles of the cutting edge, and then offset each other, thereby greatly reducing the phenomena of burrs, layering, tearing and the like in the ceramic matrix composite material processing process.
When the diamond-shaped cutting blade 2 and the triangular cutting blade 3 are matched for use, most of the allowance of the part is removed by the diamond-shaped cutting blade 2 with stronger shock resistance, and a small amount of the allowance is removed by the triangular cutting blade 3, so that the durability of the cutter is greatly improved, the generated cuttings are in a fine powder shape, and the cuttings are discharged through the chip discharge grooves and cannot interfere with or scratch the surface of a workpiece or strike the cutter.
Example 2
The preparation method of the milling cutter for machining the ceramic matrix composite part comprises the following steps:
step one, grinding a Co-containing tungsten carbide hard alloy cutter body to the diameter size by using a diamond grinding wheelThe cutter body is in a round bar shape, the chip removal groove is ground at one end of the cutter body, and the cutter has higher linear speed due to the larger cutter size, so that the cutter is suitable for rapid cutting with larger cutter feeding;
step two, using 10% Co, 10% Al and 10% TiC as binding agents, and sintering with 70% CBN (cubic boron nitride single crystal powder) at 1450 ℃ and 6GPa to obtain PCBN sintered blocks, so that the hardness and the wear resistance of the CBN can be effectively improved;
cutting the PCBN sintered block by using an electric spark cutting machine tool to obtain diamond tooth-shaped cutting blades and triangular cutting blades with required shapes, wherein the cutting allowance for sharpening is 0.2-0.3 mm during cutting so as to remove the damage amount of the PCBN cutting blades generated during cutting;
and fourthly, using 70% of Ag and 30% of Cu as welding fluxes, and welding the cut cutting blades in a chip groove and at the bottom end of a cutter body in a vacuum brazing mode to initially finish the preparation of the cutter. The oxide film of the welding surface is cleaned before welding, and the melting point state of the welding part can not exceed 15s during welding so as not to damage the polycrystalline layer, and the temperature of the welding flux is 860-920 ℃ during the processing process with higher cutting temperature and 600-700 ℃ during the processing process with lower cutting temperature.
Step five, sharpening the allowance of the cutting edge part by using a diamond grinding wheel, thereby completing the cutter processing;
and step six, checking the cutting edge under a magnifying glass of 30 to 50 times after sharpening, and preventing edge chipping and saw teeth.
Claims (10)
1. A milling cutter for machining ceramic matrix composite parts, characterized by comprising a cutter body (100) and cutting blades (200);
the cutter body (100) is cylindrical, the clamping end is cylindrical, the cutting end is provided with chip grooves (1), the chip grooves (1) are provided with 2N chip grooves (1) which are uniformly distributed along the circumference of the cutting end; n=2, 3 or 4;
the chip groove (1) is matched with the cutting blade (200);
the cutting blades (200) are fixed in the chip removal grooves (1) of the cutter body (100) in a welding mode;
the cutting blade (200) is cuboid-shaped, cutting edge parts are arranged on two sides, each cutting edge part comprises an end tooth cutting edge (4) and a peripheral tooth cutting edge (5), the end tooth cutting edge (4) is located on the side edge of the cutting blade (200), and the peripheral tooth cutting edge (5) is located on the bottom side edge of the cutting blade (200); the cutting blades (200) are arranged in two groups, the thickness D of the two groups is equal, each group is provided with two, one group is a diamond-shaped cutting blade (2), the other group is a triangular cutting blade (3), and the diamond-shaped cutting blade (2) and the triangular cutting blade (3) are arranged at intervals;
the diamond-shaped cutting blade (2) is of an integral structure and can be divided into a diamond-shaped cutting matrix and a diamond-shaped cutting edge part, wherein the diamond-shaped cutting edge part is a diamond array, the bottom surface of each diamond of the diamond array is connected with the diamond-shaped cutting matrix, and the bottom surface of each diamond is square;
the triangular cutting blade (3) is of an integral structure and can be divided into a triangular cutting matrix and a triangular cutting edge part, the cross section of the triangular cutting edge part is triangular, and the length of the bottom edge of the triangle is the thickness of the triangular cutting blade (3);
the front axial inclination angle and the back axial inclination angle are both 30-45 degrees.
2. The milling cutter for machining ceramic matrix composite parts according to claim 1, wherein the cutter body (100) is a Co-containing cemented tungsten carbide.
3. The milling cutter for machining ceramic matrix composite parts according to claim 1, wherein the cutting blades (200) are polycrystalline cubic boron nitride PCBN material.
4. The milling cutter for machining ceramic matrix composite parts according to claim 1, wherein the face of the fixed cutting blade (200) where the chip groove (1) is located is not parallel to the central axis of the cutter body (100) and has an included angle of a set inclination angle θ of 3 ° to 5 °.
5. The milling cutter for machining ceramic matrix composite parts according to claim 1, wherein the diagonal length of the diamond bottom surface square is the thickness of the diamond-shaped cutting blade (2), and the height of the diamond-shaped cutting blade isThe thickness D of the cutting blade is 0.5-1.2 mm.
6. The milling cutter for machining ceramic-based composite parts according to claim 1, wherein the thickness D of the cutting blade is 0.6mm, the tooth tip height of the diamond tooth is 0.4mm, the front axial inclination angle and the rear axial inclination angle can be equal, and the front axial inclination angle and the rear axial inclination angle are both 30 °.
7. The preparation method of the milling cutter for machining the ceramic matrix composite part is characterized by comprising the following steps of: firstly, grinding a chip groove:
selecting a round bar-shaped hard alloy material as a cutter body material, adopting a diamond grinding wheel, grinding chip grooves (1) at the cutting end of the cutter body (100), wherein the number of the chip grooves (1) is 4, and uniformly distributing at the cutting end of the cutter body (100);
step three, cutting by cutting blades:
cutting the cutting piece blank by adopting electric spark cutting according to the size requirements of the diamond-shaped cutting piece and the triangular cutting piece, and reserving machining allowance of a cutting edge part when cutting to obtain a cutting piece raw material;
fourth, fixing the cutting blade:
adopting a welding mode to fix the cutting blade raw material at a set position of a chip removal groove (1);
grinding the cutting edge part:
and respectively grinding an end tooth cutting edge (4) and a peripheral tooth cutting edge (5) according to the size requirements of the edge parts of the diamond tooth cutting blade and the triangular cutting blade until the cutting edge parts meet the set size requirements, so as to obtain the milling cutter for machining the ceramic matrix composite parts.
8. The method of manufacturing a milling cutter for machining ceramic matrix composite parts according to claim 7, wherein the fourth step, the cutting blade fixing, further comprises:
the welding mode is vacuum brazing, 70% of Ag and 30% of Cu are used as brazing filler metals in the welding mode, and the melting time of the brazing filler metals is not more than 15s in the welding process.
9. A preparation method of a milling cutter cutting piece blank for machining ceramic matrix composite parts is characterized in that powder metallurgy sintering is adopted to prepare the cutting piece blank, co, al, tiC powder is used as a binding agent, the binding agent and cubic boron nitride single crystal powder are uniformly mixed and compacted, and sintering is carried out in powder metallurgy sintering equipment to obtain polycrystalline cubic boron nitride PCBN cutting piece blank.
10. The method for manufacturing a milling cutter cutting piece blank for machining a ceramic matrix composite part according to claim 9, wherein the mass ratio of the cubic boron nitride single crystal powder to the binder is 7:3, the mass ratio of Co, al and TiC powder is 1:1:1, a step of; the sintering temperature of the powder metallurgy sintering is 1450 ℃, and the compaction pressure is 6GPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311838746.5A CN117840496A (en) | 2023-12-28 | 2023-12-28 | Milling cutter for machining ceramic matrix composite parts and preparation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311838746.5A CN117840496A (en) | 2023-12-28 | 2023-12-28 | Milling cutter for machining ceramic matrix composite parts and preparation method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117840496A true CN117840496A (en) | 2024-04-09 |
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ID=90539192
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311838746.5A Pending CN117840496A (en) | 2023-12-28 | 2023-12-28 | Milling cutter for machining ceramic matrix composite parts and preparation method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117840496A (en) |
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2023
- 2023-12-28 CN CN202311838746.5A patent/CN117840496A/en active Pending
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