CN114160797A - Superhard material polycrystalline composite twist milling cutter and preparation method thereof - Google Patents
Superhard material polycrystalline composite twist milling cutter and preparation method thereof Download PDFInfo
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- CN114160797A CN114160797A CN202111476592.0A CN202111476592A CN114160797A CN 114160797 A CN114160797 A CN 114160797A CN 202111476592 A CN202111476592 A CN 202111476592A CN 114160797 A CN114160797 A CN 114160797A
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- 239000000463 material Substances 0.000 title claims abstract description 71
- 238000003801 milling Methods 0.000 title claims abstract description 42
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- 239000002131 composite material Substances 0.000 title claims abstract description 15
- 239000000758 substrate Substances 0.000 claims abstract description 40
- 229910052751 metal Inorganic materials 0.000 claims abstract description 27
- 239000002184 metal Substances 0.000 claims abstract description 27
- 239000002002 slurry Substances 0.000 claims abstract description 20
- 150000003839 salts Chemical class 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims abstract description 16
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 14
- 238000003786 synthesis reaction Methods 0.000 claims abstract description 14
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 13
- 239000000956 alloy Substances 0.000 claims abstract description 13
- 238000011049 filling Methods 0.000 claims abstract description 11
- 238000003825 pressing Methods 0.000 claims abstract description 10
- 238000003466 welding Methods 0.000 claims abstract description 6
- 238000001035 drying Methods 0.000 claims abstract description 5
- 238000004321 preservation Methods 0.000 claims abstract description 5
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 41
- 239000011780 sodium chloride Substances 0.000 claims description 24
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 17
- 239000011230 binding agent Substances 0.000 claims description 13
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 claims description 13
- 229910001928 zirconium oxide Inorganic materials 0.000 claims description 13
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 10
- 239000002904 solvent Substances 0.000 claims description 10
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 8
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 8
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 7
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 6
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 6
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 6
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- BBMCTIGTTCKYKF-UHFFFAOYSA-N 1-heptanol Chemical compound CCCCCCCO BBMCTIGTTCKYKF-UHFFFAOYSA-N 0.000 claims description 4
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 claims description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 4
- 239000010432 diamond Substances 0.000 claims description 4
- 229910003460 diamond Inorganic materials 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 4
- 239000010941 cobalt Substances 0.000 claims description 3
- 229910017052 cobalt Inorganic materials 0.000 claims description 3
- 229910052759 nickel Inorganic materials 0.000 claims description 3
- QYEXBYZXHDUPRC-UHFFFAOYSA-N B#[Ti]#B Chemical compound B#[Ti]#B QYEXBYZXHDUPRC-UHFFFAOYSA-N 0.000 claims description 2
- 229910052582 BN Inorganic materials 0.000 claims description 2
- 229910033181 TiB2 Inorganic materials 0.000 claims description 2
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 238000000465 moulding Methods 0.000 claims description 2
- 238000012546 transfer Methods 0.000 claims description 2
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 229910052758 niobium Inorganic materials 0.000 description 8
- 239000010955 niobium Substances 0.000 description 8
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 5
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- 238000005299 abrasion Methods 0.000 description 4
- 238000005520 cutting process Methods 0.000 description 4
- 238000009740 moulding (composite fabrication) Methods 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 229910001080 W alloy Inorganic materials 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000003754 machining Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
-
- 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
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
- B22F2005/001—Cutting tools, earth boring or grinding tool other than table ware
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Powder Metallurgy (AREA)
Abstract
The invention discloses a superhard material polycrystalline composite twist milling cutter and a preparation method thereof, wherein the preparation method of the milling cutter comprises the following steps: firstly, obtaining a substrate with a spiral groove on the surface; putting the substrate into a metal cup, injecting the superhard material slurry into the spiral groove on the surface of the substrate in a grouting mode, drying, and covering a cup cover to obtain an original blank; filling the original blank into a container, filling a salt material into the container until the original blank is buried, and taking out the metal cup after cold pressing and compacting to obtain an assembly body; and (3) placing the assembly body in a heat-preservation pressure-transmission medium for high-temperature high-pressure synthesis, taking out, removing the metal cup, welding a metal rod, and then removing part of the hard alloy from the polycrystalline edge according to the shape characteristics of the spiral milling cutter to form a spiral groove of the spiral milling cutter. The method has simple process, the obtained finished product has high wear resistance, the service life is effectively prolonged, and the functions of reaming and edge milling can be simultaneously realized.
Description
Technical Field
The invention relates to a twist milling cutter, in particular to a superhard material polycrystalline composite twist milling cutter and a preparation method thereof.
Background
Twist milling cutters are widely used tools having chip flutes that are helically shaped like a twist, typically for machining flat surfaces and for machining the edges of workpieces. The traditional twist milling cutter is usually made of common alloy or cemented carbide with higher performance.
With the continuous development of the machining industry, the requirement on the precision of a machined workpiece is higher and higher, the traditional twist milling cutter has the defects that the precision is rapidly reduced due to high abrasion speed in the use process, or unacceptable abrasion occurs before a single workpiece is not finished, and the like, and the hardness and the toughness of the material of the twist milling cutter or the cutting edge of the twist milling cutter need to be improved to solve the problems. At present, no report related to the adoption of superhard polycrystalline materials as materials for manufacturing the spiral milling cutter or the cutting edge of the spiral milling cutter and the preparation method thereof is found.
Disclosure of Invention
The invention aims to provide a superhard material polycrystalline composite twist milling cutter with simple preparation method and high wear resistance and a preparation method thereof.
The preparation method of the superhard material polycrystalline composite twist milling cutter comprises the following steps:
1) obtaining a substrate with a spiral groove on the surface;
2) carrying out size mixing on the superhard material polycrystal and the binder by using a volatile solvent to obtain superhard material slurry;
3) putting the substrate into a metal cup, injecting the superhard material slurry into the spiral groove on the surface of the substrate in a grouting mode, drying to remove the solvent, and covering a cup cover of the metal cup to obtain an original blank;
4) filling the original blank into a container, filling a salt material into the container until the original blank is buried, then sending the container into hydraulic equipment for cold pressing and compacting, and taking out a metal cup after the completion to obtain an assembly body; wherein the content of the first and second substances,
the container is provided with a space capable of accommodating an original blank body and is obtained by cold press molding of a salt material;
the salt material consists of sodium chloride, zirconium oxide and graphite powder, and comprises the following components in percentage by weight: the sodium chloride is more than 70 percent, the zirconia is less than 20 percent, the graphite powder is less than 10 percent, and the combination of the sodium chloride, the zirconia and the graphite powder is 100 percent;
5) placing the assembly body in a heat-preservation pressure-transfer medium, carrying out high-temperature and high-pressure synthesis, taking out, and removing the metal cup to obtain a substrate with polycrystalline;
6) and welding a metal rod on the substrate with the polycrystalline, and then removing part of the hard alloy from the polycrystalline edge according to the shape characteristics of the spiral milling cutter to form a spiral groove of the spiral milling cutter, thereby obtaining the polycrystalline composite spiral milling cutter made of the superhard material.
In step 1) of the above preparation method, the substrate having a spiral groove on the surface refers to a substrate having a spiral groove on the surface similar to or identical to the surface of the finished twist milling cutter, wherein the substrate is generally in a cylindrical shape, and the material of the substrate is preferably a hard alloy, and specifically may be an existing conventional alloy of tungsten carbide and cobalt, an alloy of tungsten carbide and titanium, or an alloy of tungsten carbide and nickel. The substrate having the spiral grooves on the surface thereof can be obtained by obtaining a cemented carbide substrate (for example, by directly purchasing from the market, or by preparing according to the conventional method (weighing the components according to the formulation, mixing, forming and sintering), and then processing the spiral grooves on the surface thereof. Currently, conventional cemented carbide bases available directly from the market are YG16, YG16C, YG12, YG12C, YG10, YG10C, YG8, and the like.
In step 2) of the preparation method, the selection and the dosage of the superhard material polycrystalline and the binder are the same as those of the prior art. Specifically, the superhard material polycrystalline body can be one or a combination of more than two selected from cubic boron nitride, diamond and titanium diboride; when the superhard material polycrystalline is selected from the combination of more than two of the superhard materials, the superhard material polycrystalline can be mixed in any ratio. The binder may be one or a combination of two or more selected from iron, cobalt and nickel; when the binder is selected from a combination of two or more of the foregoing, they may be present in any ratio. The superhard material polycrystalline and the binder both participate in the batching in a powder form, and the selection of the particle size of the superhard material polycrystalline and the binder is the same as that of the superhard material polycrystalline and the binder in the prior art, wherein the particle size of the binder is preferably 0.1-10 mu m, and the particle size of the superhard abrasive is preferably 0.5-50 mu m. In the application, the proportion of the superhard material polycrystalline and the binder is preferably 70-96: 4-30, more preferably 90: 10.
in step 2) of the above preparation method, the volatile solvent may be one or a combination of two or more of volatile organic solvents selected from ethanol, ethylene glycol, glycerol, acetone, diethyl ether, n-heptanol, and the like, preferably ethanol. During slurry mixing, the amount of the volatile solvent is suitable, and the concentrations of the polycrystalline superhard material and the binder in the slurry are controlled to be 43.75-73.8 wt% and 2.50-23.07 wt%, respectively.
In step 3) of the above preparation method, the metal cup of the present invention is a cup conventionally used for containing powder in the prior art, such as a cup made of ductile materials, such as a molybdenum cup, a niobium cup, a zirconium cup or a stainless steel cup with a cover. Preferably, the inner diameter of the metal cup is in clearance fit or expansion fit with the outer diameter of the substrate, so that polycrystalline of the superhard material is saved. In the step, the superhard material slurry is injected into the spiral groove on the surface of the substrate by an injector, and the metal cup is dried at a certain temperature after being filled with the superhard material slurry to remove the solvent (generally, the metal cup is dried for 1 to 3 hours in an environment of 60 to 80 ℃, and then is transferred into a vacuum oven to be further dried by heat preservation for 1 to 2 hours at the temperature of 120 to 180 ℃).
In step 4) of the above-mentioned manufacturing method, there is no particular requirement for the shape of the container, but it must have a space capable of accommodating the original blank therein, such as a hollow tube shape, a square or circular shape having only one opening, or a honeycomb shape capable of accommodating a plurality of original blanks at the same time with a gap between the respective original blanks, and the like. The container of the desired shape is obtained by cold press forming in a hydraulic apparatus by placing the salt material in a cold press mould.
In step 4) of the above preparation method, the composition of the salt material for forming the container or for filling is critical to whether the subsequent high-temperature and high-pressure synthesis can be performed to obtain a finished product with high wear resistance and high impact strength, and when the composition of the salt material is not within the range defined in the present application, the performance of the obtained finished milling cutter is not ideal. In the present application, the composition of the salt material is further: 75-85% of sodium chloride, 10-18% of zirconium oxide and 3-8% of graphite powder; more preferably 80% of sodium chloride, 15% of zirconium oxide and 5% of graphite powder.
In step 5) of the above preparation method, the heat-insulating pressure-transmitting medium and the subsequent high-temperature high-pressure synthesis are the same as those in the prior art, specifically, the heat-insulating pressure-transmitting medium is usually pyrophyllite, and the process conditions of the high-temperature high-pressure synthesis are preferably as follows: the pressure is 4.5-5.5 GPa, the temperature is 1400-1750 ℃, and the time is 15-30 min. After the high-temperature high-pressure synthesis is finished, the metal cup is taken out from the heat-preservation pressure-transmission medium and put into a centerless grinding machine, and the metal cup is ground to expose the substrate with the polycrystal.
The invention also discloses the superhard material polycrystalline composite twist milling cutter prepared by the method.
Compared with the prior art, the superhard material polycrystalline and the binder are mixed by the volatile solvent to form slurry, the superhard material slurry is injected into the spiral groove on the surface of the substrate in a grouting mode, the solvent is removed at high temperature, and then the slurry is placed in a container formed by cold pressing of specific components to be synthesized at high temperature and high pressure to form the cutting edge of the twist milling cutter.
Drawings
Fig. 1 is a schematic structural view of a substrate having a spiral groove on a surface thereof in example 1 of the present invention.
Fig. 2 is a schematic structural diagram of the superhard material polycrystalline composite twist milling cutter in embodiment 1 of the present invention.
The reference numbers in the figures are:
1 a substrate with a spiral groove on the surface, and 2 a superhard material polycrystalline composite twist milling cutter.
Detailed Description
In order to better explain the technical solution of the present invention, the following describes the present invention in further detail with reference to the examples and the accompanying drawings, but the embodiments of the present invention are not limited thereto. Unless otherwise specified, technical features used in the embodiments may be replaced with other technical features known in the art having equivalent or similar functions or effects without departing from the inventive concept.
Example 1
1) A hard alloy with the model number of YG16 is purchased from the market, a spiral groove is arranged on the surface of the hard alloy, a substrate 1 with the spiral groove on the surface is obtained, and the structural schematic diagram of the substrate is shown in figure 1;
2) mixing 90 wt% of diamond micro powder (4-6 mu m) and 10 wt% of cobalt powder (1-2 mu m) into paste by using ethanol which is 0.4 times of the total weight of the diamond micro powder and the cobalt powder to obtain superhard material slurry;
3) putting the substrate into a niobium cup which is attached to the substrate (namely, in clearance fit), sucking the superhard material slurry by using an injector and injecting the slurry into a gap between the substrate and the niobium cup, drying the slurry for 2 hours at the temperature of 75 ℃, then transferring the slurry into a vacuum oven to perform vacuum heat treatment for 1 hour at the temperature of 150 ℃, and covering a cup cover to obtain an original blank;
4) filling the original blank into a honeycomb container formed by cold pressing of a salt material, filling the salt material into the container until the original blank is buried, then sending the container into hydraulic equipment (DY6-15/S series oil press, Shandong Texas Xiangyu hydraulic machine and tool works) for cold pressing and compacting, and taking out a metal cup after the cold pressing and compacting are completed to obtain an assembly body; wherein the content of the first and second substances,
the saline material comprises the following components in percentage by weight: 80% of sodium chloride, 15% of zirconium oxide and 5% of graphite powder;
5) placing the assembly body in a pyrophyllite block, and carrying out high-temperature high-pressure synthesis (the high-temperature high-pressure synthesis process conditions are as follows: the pressure is 5.5GPa, the temperature is 1600 ℃, and the temperature is kept for 20min), after the high-temperature high-pressure synthesis is finished, the metal cup is taken out from the pyrophyllite block and put into a centerless grinder, and the niobium cup is ground to expose the substrate with the glomerocryst;
6) and welding a metal rod on the substrate with the polycrystalline, and then removing part of the hard alloy from the polycrystalline edge according to the shape characteristics of the spiral milling cutter to form a spiral groove of the spiral milling cutter, so as to obtain the polycrystalline composite spiral milling cutter 2 made of the superhard material, wherein the structural schematic diagram of the obtained spiral milling cutter is shown in fig. 2.
Comparative example 1
The method comprises the steps of adopting a hard alloy with the model number of YG16 purchased from the market as a base body, welding a metal rod on the base body, and then cutting off part of the hard alloy according to the shape characteristics of the twist milling cutter to form a spiral groove of the twist milling cutter to obtain the twist milling cutter.
Comparative example 2
Example 1 was repeated, except that: in the step 4), the saline material comprises the following components in percentage by weight: 60% of sodium chloride, 25% of zirconium oxide and 15% of graphite powder.
Comparative example 3
Example 1 was repeated, except that: in the step 4), the saline material comprises the following components in percentage by weight: 75% of sodium chloride, 15% of zirconium oxide and 10% of graphite powder.
Comparative example 4
Example 1 was repeated, except that: in the step 4), the saline material comprises the following components in percentage by weight: 60% of sodium chloride, 20% of zirconium oxide and 20% of graphite powder.
Comparative example 5
Example 1 was repeated, except that: in the step 4), the saline material comprises the following components in percentage by weight: 70% of sodium chloride, 20% of zirconium oxide and 10% of graphite powder.
Example 2
1) The method comprises the steps of purchasing a hard alloy with the model number of YG8 from the market, and forming a spiral groove on the surface of the hard alloy to obtain a substrate 1 with the spiral groove on the surface;
2) mixing 70 wt% of cubic boron nitride micro powder (4-6 mu m) and 30 wt% of cobalt powder (1-2 mu m) into paste by using acetone which is 0.4 times of the total weight of the cubic boron nitride micro powder and the cobalt powder to obtain superhard material slurry;
3) putting the substrate into a niobium cup which is attached to the substrate (namely, in clearance fit), sucking the superhard material slurry by using an injector and injecting the slurry into a gap between the substrate and the niobium cup, placing the substrate and the niobium cup for drying at 70 ℃ for 2 hours, then transferring the substrate into a vacuum oven for vacuum heat treatment at 150 ℃ for 1 hour, and covering a cup cover to obtain an original blank;
4) filling the original blank into a honeycomb container formed by cold pressing of a salt material, filling the salt material into the container until the original blank is buried, then sending the container into hydraulic equipment (DY6-15/S series oil press, Shandong Texas Xiangyu hydraulic machine and tool works) for cold pressing and compacting, and taking out a metal cup after the cold pressing and compacting are completed to obtain an assembly body; wherein the content of the first and second substances,
the saline material comprises the following components in percentage by weight: 82% of sodium chloride, 12% of zirconium oxide and 6% of graphite powder;
5) placing the assembly body in a pyrophyllite block, and carrying out high-temperature high-pressure synthesis (the high-temperature high-pressure synthesis process conditions are as follows: the pressure is 5.0GPa, the temperature is 1400 ℃, the temperature is kept for 15min), after the high-temperature high-pressure synthesis is finished, the metal cup is taken out from the pyrophyllite block and put into a centerless grinder, and the niobium cup is ground to expose the substrate with the glomerocryst;
6) and welding a metal rod on the substrate with the polycrystalline, and then removing part of the hard alloy from the polycrystalline edge according to the shape characteristics of the spiral milling cutter to form a spiral groove of the spiral milling cutter, so as to obtain the polycrystalline composite spiral milling cutter 2 made of the superhard material.
Example 3
Example 1 was repeated except that: in the step 4), the saline material comprises the following components in percentage by weight: 75% of sodium chloride, 18% of zirconium oxide and 7% of graphite powder.
The abrasion resistance of the twist milling cutters prepared in the embodiments 1-3 and the respective proportions is detected, and the test method comprises the following steps: and (5) detecting the abrasion ratio, and testing the number of the processed 14-inch notebook computer shell aluminum alloy frames. The results are shown in table 1 below.
Table 1:
Claims (7)
1. a preparation method of a superhard material polycrystalline composite twist milling cutter comprises the following steps:
1) obtaining a substrate with a spiral groove on the surface;
2) carrying out size mixing on the superhard material polycrystal and the binder by using a volatile solvent to obtain superhard material slurry;
3) putting the substrate into a metal cup, injecting the superhard material slurry into the spiral groove on the surface of the substrate in a grouting mode, drying to remove the solvent, and covering a cup cover of the metal cup to obtain an original blank;
4) filling the original blank into a container, filling a salt material into the container until the original blank is buried, then sending the container into hydraulic equipment for cold pressing and compacting, and taking out a metal cup after the completion to obtain an assembly body; wherein the content of the first and second substances,
the container is provided with a space capable of accommodating an original blank body and is obtained by cold press molding of a salt material;
the salt material consists of sodium chloride, zirconium oxide and graphite powder, and comprises the following components in percentage by weight: the sodium chloride is more than 70 percent, the zirconia is less than 20 percent, the graphite powder is less than 10 percent, and the combination of the sodium chloride, the zirconia and the graphite powder is 100 percent;
5) placing the assembly body in a heat-preservation pressure-transfer medium, carrying out high-temperature and high-pressure synthesis, taking out, and removing the metal cup to obtain a substrate with polycrystalline;
6) and welding a metal rod on the substrate with the polycrystalline, and then removing part of the hard alloy from the polycrystalline edge according to the shape characteristics of the spiral milling cutter to form a spiral groove of the spiral milling cutter, thereby obtaining the polycrystalline composite spiral milling cutter made of the superhard material.
2. The method according to claim 1, wherein in the step 2), the volatile solvent is one or more selected from the group consisting of ethanol, ethylene glycol, glycerol, acetone, diethyl ether and n-heptanol.
3. The method according to claim 1, wherein in step 2), the superhard material is polycrystalline and is selected from one or a combination of two or more of cubic boron nitride, diamond and titanium diboride, and the binder is selected from one or a combination of two or more of iron, cobalt and nickel.
4. The method as claimed in claim 1, wherein in step 4), the composition of the salt material is as follows: 75-85% of sodium chloride, 10-18% of zirconium oxide and 3-8% of graphite powder.
5. The method as claimed in claim 1, wherein in step 4), the composition of the salt material is as follows: 80% of sodium chloride, 15% of zirconium oxide and 5% of graphite powder.
6. The method of claim 1, wherein: in the step 5), the process conditions of the high-temperature high-pressure synthesis are as follows: the pressure is 4.5-5.5 GPa, the temperature is 1400-1750 ℃, and the time is 15-30 min.
7. A polycrystalline composite fluted cutter of superhard material prepared according to the method of any one of claims 1 to 6.
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