CN110372393B - Production method of polycrystalline cubic boron nitride composite sheet - Google Patents
Production method of polycrystalline cubic boron nitride composite sheet Download PDFInfo
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- CN110372393B CN110372393B CN201910712042.0A CN201910712042A CN110372393B CN 110372393 B CN110372393 B CN 110372393B CN 201910712042 A CN201910712042 A CN 201910712042A CN 110372393 B CN110372393 B CN 110372393B
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- 229910052582 BN Inorganic materials 0.000 title claims abstract description 64
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 title claims abstract description 64
- 239000002131 composite material Substances 0.000 title claims abstract description 22
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 12
- 239000002245 particle Substances 0.000 claims abstract description 49
- 238000002156 mixing Methods 0.000 claims abstract description 31
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 27
- 239000004202 carbamide Substances 0.000 claims abstract description 27
- INZDTEICWPZYJM-UHFFFAOYSA-N 1-(chloromethyl)-4-[4-(chloromethyl)phenyl]benzene Chemical compound C1=CC(CCl)=CC=C1C1=CC=C(CCl)C=C1 INZDTEICWPZYJM-UHFFFAOYSA-N 0.000 claims abstract description 5
- 238000000137 annealing Methods 0.000 claims abstract description 5
- 238000003825 pressing Methods 0.000 claims abstract description 5
- 230000002194 synthesizing effect Effects 0.000 claims abstract description 5
- 238000005303 weighing Methods 0.000 claims abstract description 5
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 4
- 239000010936 titanium Substances 0.000 claims abstract description 4
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 4
- 238000003756 stirring Methods 0.000 claims description 48
- 238000005520 cutting process Methods 0.000 claims description 40
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 20
- 238000007789 sealing Methods 0.000 claims description 20
- 239000000741 silica gel Substances 0.000 claims description 20
- 229910002027 silica gel Inorganic materials 0.000 claims description 20
- 230000009471 action Effects 0.000 claims description 8
- 230000001681 protective effect Effects 0.000 claims description 6
- 230000015572 biosynthetic process Effects 0.000 claims description 5
- 238000003786 synthesis reaction Methods 0.000 claims description 5
- 230000005540 biological transmission Effects 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 15
- 239000000126 substance Substances 0.000 abstract description 7
- GJNGXPDXRVXSEH-UHFFFAOYSA-N 4-chlorobenzonitrile Chemical compound ClC1=CC=C(C#N)C=C1 GJNGXPDXRVXSEH-UHFFFAOYSA-N 0.000 abstract description 5
- 230000007246 mechanism Effects 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 16
- 239000000203 mixture Substances 0.000 description 12
- 238000001914 filtration Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 8
- CYKMNKXPYXUVPR-UHFFFAOYSA-N [C].[Ti] Chemical compound [C].[Ti] CYKMNKXPYXUVPR-UHFFFAOYSA-N 0.000 description 7
- 238000003754 machining Methods 0.000 description 4
- 229910003460 diamond Inorganic materials 0.000 description 3
- 239000010432 diamond Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 241001391944 Commicarpus scandens Species 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 229910001060 Gray iron Inorganic materials 0.000 description 1
- 229910000760 Hardened steel Inorganic materials 0.000 description 1
- 229910001315 Tool steel Inorganic materials 0.000 description 1
- 229910001037 White iron Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- JMANVNJQNLATNU-UHFFFAOYSA-N oxalonitrile Chemical compound N#CC#N JMANVNJQNLATNU-UHFFFAOYSA-N 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
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- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
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- B01F27/90—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with paddles or arms
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- B01F33/00—Other mixers; Mixing plants; Combinations of mixers
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- B01F33/83—Mixing plants specially adapted for mixing in combination with disintegrating operations
- B01F33/8305—Devices with one shaft, provided with mixing and milling tools, e.g. using balls or rollers as working tools; Devices with two or more tools rotating about the same axis
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01F33/00—Other mixers; Mixing plants; Combinations of mixers
- B01F33/80—Mixing plants; Combinations of mixers
- B01F33/836—Mixing plants; Combinations of mixers combining mixing with other treatments
- B01F33/8361—Mixing plants; Combinations of mixers combining mixing with other treatments with disintegrating
- B01F33/83611—Mixing plants; Combinations of mixers combining mixing with other treatments with disintegrating by cutting
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Abstract
The invention provides a production method of a polycrystalline cubic boron nitride composite sheet, which comprises the following steps: 1) mixing 44-46% of cubic boron nitride particles with the average particle size of 1-2 microns, 43-46% of cubic boron nitride particles with the average particle size of 3-5 microns and 1-5% of titanium carbonitride in a mixing tank for 17-19 minutes; adding 1-5% of urea, mixing for 15-25 minutes, 2) adding 1-5% of vanadium carbide, mixing for 6-10 hours, accurately weighing, assembling and pressing, annealing for 3-5 hours under the conditions of 800-plus-material temperature of 1000 ℃ and high vacuum of 10-14Pa, and synthesizing the polycrystalline cubic boron nitride composite sheet for the high-end cutter in a cubic boron nitride hydraulic press under the conditions of 95-97MPa and 1400-plus-material temperature of 1500 ℃ for 30-40 minutes. The invention can improve the chemical wear mechanism tolerance and chemical inertia, and can prolong the service life of the PCBN cutter piece (artificial cubic boron nitride cutter) by about 20 percent.
Description
Technical Field
The invention relates to the technical field of polycrystalline boron nitride composite sheets, in particular to a production method of a polycrystalline cubic boron nitride composite sheet.
Background
At present, in high-speed finish machining of materials which are difficult to cut, such as quenched steel, cast iron, carbon steel and the like, the cutter machining materials are required to have high thermal stability and good thermal conductivity, and the cutter composite sheet materials such as polycrystalline diamond and the like are easy to break due to overhigh temperature in the cutting process, so that the working efficiency is influenced. The hardness of the cubic boron nitride is second to that of diamond, has high thermal stability and strong chemical stability, and can effectively replace a polycrystalline diamond compact as a material of a ferrous metal machining cutter. The polycrystalline cubic boron nitride composite sheet cutter can be used for processing hard alloy such as hardened steel, die steel, tool steel, alloy steel, gray iron, white iron and the like, ceramic and other materials which are difficult to process by traditional cutters with the hardness of HRC60 or above, and has unique characteristics and application cases in the aspects of interrupted cutting and rough machining. The cutting tool is suitable for common machine tools, special machine tools, automatic lines and numerical control machine tools, and is widely applied to cutting processing in industries such as military industry, automobiles, metallurgical rolls, bearings, molds and the like.
The existing production method of the polycrystalline cubic boron nitride composite sheet of cubic boron nitride uses cubic boron nitride with single granularity, and the technological parameters are unreasonable, so that the PCBN cutter sheet (artificial cubic boron nitride cutter) has the defect of short service life.
Disclosure of Invention
Technical problem to be solved
The invention aims to provide a production method of a polycrystalline cubic boron nitride composite sheet, which solves the defects that the conventional production method of the polycrystalline cubic boron nitride composite sheet of cubic boron nitride uses cubic boron nitride with single granularity, and the process parameters are unreasonable, so that the service life of a PCBN cutter piece (artificial cubic boron nitride cutter) is short.
(II) technical scheme
In order to solve the technical problem, the invention provides a production method of a polycrystalline cubic boron nitride composite sheet, which comprises the following steps:
1) mixing 44-46% of cubic boron nitride particles with the average particle size of 1-2 microns, 43-46% of cubic boron nitride particles with the average particle size of 3-5 microns and 1-5% of titanium carbonitride in a mixing tank for 17-19 minutes; adding 1-5% of urea, mixing for 15-25 minutes,
2) adding 1-5% vanadium carbide, mixing for 6-10 hours, accurately weighing, assembling and pressing, annealing for 3-5 hours under the conditions of 800-97 MPa and high vacuum 10-4Pa, and synthesizing the polycrystalline cubic boron nitride composite sheet for the high-end cutter in a cubic hydraulic press under the conditions of 95-97MPa and 1400-1500 ℃ for 30-40 minutes. The invention improves the chemical wear mechanism tolerance and chemical inertia by changing the granularity composition and the proportioning composition of various materials of the cubic boron nitride, adjusting the synthesis pressure and the synthesis temperature, adjusting the process indexes of each procedure of assembly, and can improve the service life of the PCBN cutter piece (the artificial cubic boron nitride cutter) by about 20 percent.
Optionally, the mixing tank comprises a tank body, a stirring rod and a fixing frame are inserted into the tank body from top to bottom, the fixing frame is provided with a first charging barrel with a gap with the stirring rod, and the stirring rod penetrates through the first charging barrel and extends downwards into the bottom of the pipe body; a filter hole is formed in the upper area of the first charging barrel; a rectangular second charging barrel is fixed on the stirring rod at the upper part of the first charging barrel; the second charging barrel comprises an inner barrel and an outer barrel which are fixed on the stirring rod; the bottom of the inner cylinder is provided with a cutting blade, the bottom end of the cutting blade is hinged with the inner cylinder, the top of the cutting blade is provided with sealing silica gel, and the sealing silica gel divides the second charging cylinder into a charging cavity and a movable cavity which are positioned at the upper part and used for charging urea; the cutting edge of cutting blade is just to sealing silica gel for cut sealing silica gel at the effect of the centrifugal force of stirring rod. The process of the invention needs to put in a mixture of 44-46 percent of cubic boron nitride particles with the average particle size of 1-2 microns, 43-46 percent of cubic boron nitride particles with the average particle size of 3-5 microns and 1-5 percent of titanium carbon nitride in sequence, fully mix the particles, and then put in urea for mixing, wherein the process needs to open a tank for secondary feeding, the operation is complex, urea with a specific proportion cannot be randomly added, the volatility of the urea is strong, and the sharp nose has certain toxicity to human bodies (particularly eyes and mouth and nose); if the personnel stand beside the tank body to slowly feed, the gas mask needs to be worn; the invention adopts a novel mixing tank; pre-charging urea into a second charging barrel; the cutting edge of the cutting blade is opposite to the sealing silica gel and is used for cutting the sealing silica gel under the action of the centrifugal force of the stirring rod; the urea can be added into a mixture of 44-46 percent of cubic boron nitride particles with the average particle size of 1-2 microns, 43-46 percent of cubic boron nitride particles with the average particle size of 3-5 microns and 1-5 percent of titanium carbon nitride by controlling the stirring speed of a stirring rod, the feeding is simple and easy to control, and secondary feeding is not needed; the urea is allowed to be added gradually in the mixing process of the mixture of 4 to 46 percent of cubic boron nitride particles with the average particle size of 1 to 2 microns, 43 to 46 percent of cubic boron nitride particles with the average particle size of 3 to 5 microns and 1 to 5 percent of titanium carbon nitride, and the dust is not easy to float everywhere; so that the mixture is more uniform; the personnel do not need to stand on the side of the tank body to slowly put in the urea, the personnel are prevented from slowly putting in the urea on the side of the tank body, the influence on the human body is avoided, and the operation is safer. Simultaneously, after the material of the first charging barrel overflows and exceeds the lowest position of the filtering hole, the material is further thrown out after being filtered through the filtering hole under the action of the centrifugal force of the stirring rod, and the urea does not need to be filtered independently.
Optionally, a hinged support is arranged at the bottom of the inner cylinder, the bottom of the cutting blade is hinged to the hinged support, and a torsion spring is further installed between the cutting blade and the hinged support and used for enabling the cutting blade to retract the inner cylinder. The invention is provided with the torsion spring, so that the cutting blade can be folded or unfolded randomly, and the urea feeding rate can be controlled conveniently.
Optionally, the first charging barrel comprises a barrel body fixed on the fixed frame and an arc-shaped protective dome positioned at the top of the barrel body.
Optionally, the protective dome is provided with a charging barrel.
Optionally, the top of the stirring rod is in transmission connection with a driving motor; the stirring rod is positioned in the first charging barrel and is internally provided with a pair of first stirring blades.
Optionally, the stirring rod extends downwards out of the bottom of the first charging barrel and is provided with a second stirring blade.
Optionally, a feeding pipe extending downwards is fixed at the top of the tank body; the bottom of the tank body is provided with a discharge pipe, and a control valve is arranged on the discharge pipe.
(III) advantageous effects
The invention provides a production method of a polycrystalline cubic boron nitride composite sheet, which has the following advantages:
1. the invention improves the chemical wear mechanism tolerance and chemical inertia by changing the granularity composition and the proportioning composition of various materials of the cubic boron nitride, adjusting the synthesis pressure and the synthesis temperature, adjusting the process indexes of each procedure of assembly, and can improve the service life of the PCBN cutter piece (the artificial cubic boron nitride cutter) by about 20 percent.
2. The invention adopts a novel mixing tank; pre-charging urea into a second charging barrel; the cutting edge of the cutting blade is opposite to the sealing silica gel and is used for cutting the sealing silica gel under the action of the centrifugal force of the stirring rod; the urea can be added into a mixture of 44-46 percent of cubic boron nitride particles with the average particle size of 1-2 microns, 43-46 percent of cubic boron nitride particles with the average particle size of 3-5 microns and 1-5 percent of titanium carbon nitride by controlling the stirring speed of a stirring rod, the feeding is simple and easy to control, and secondary feeding is not needed; the urea is allowed to be added gradually in the mixing process of the mixture of 4 to 46 percent of cubic boron nitride particles with the average particle size of 1 to 2 microns, 43 to 46 percent of cubic boron nitride particles with the average particle size of 3 to 5 microns and 1 to 5 percent of titanium carbon nitride, and the dust is not easy to float everywhere; so that the mixture is more uniform; the personnel do not need to stand on the side of the tank body to slowly put in the urea, the personnel are prevented from slowly putting in the urea on the side of the tank body, the influence on the human body is avoided, and the operation is safer. Cutting off the sealing silica gel under the action of centrifugal force; the urea is slowly put into the first charging barrel, and meanwhile, after the material of the first charging barrel overflows and exceeds the lowest position of the filtering hole, the material is further thrown out after being filtered through the filtering hole under the action of the centrifugal force of the stirring rod, and the urea does not need to be separately filtered.
Drawings
Fig. 1 is a cross-sectional view of a mixing tank of example 4 of a method of producing a polycrystalline cubic boron nitride compact of the present disclosure;
fig. 2 is a top view of the interior of a mixing tank of example 4 of a method of producing a polycrystalline cubic boron nitride compact of the present disclosure;
fig. 3 is an outside view of the barrel of the first charging barrel of the mixing tank of example 4 of the method of producing a polycrystalline cubic boron nitride compact of the present invention;
fig. 4 is a cross-sectional view of a second charging barrel of the mixing tank of example 4 of the method of producing a polycrystalline cubic boron nitride compact of the present invention.
1. The device comprises a tank body, 2, a stirring rod, 3, a fixing frame, 4, a driving motor, 5, a first charging barrel, 6, a first stirring blade, 7, a second stirring blade, 8, a filtering hole, 9, a second charging barrel, 10, an outer barrel, 11, an inner barrel, 12, a cutting blade, 13, sealing silica gel, 14, a charging cavity, 15, a movable cavity, 16, a hinged support, 17, a torsion spring, 18, a barrel body, 19, a protective dome, 20, a charging barrel, 21, a charging pipe, 22, a discharging pipe, 23 and a control valve.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the description of the present invention, "a plurality" means two or more unless otherwise specified; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; may be mechanically coupled, directly coupled, or indirectly coupled through an intermediary. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1
The invention provides a production method of a polycrystalline cubic boron nitride composite sheet, which comprises the following steps:
1) mixing 44% of cubic boron nitride particles with the average particle size of 1-2 microns, 46% of cubic boron nitride particles with the average particle size of 3-5 microns and 5% of titanium carbon nitride in a mixing tank for 17 minutes; 2 percent of urea is added and mixed for 15 minutes,
2) and adding 3% of vanadium carbide, mixing for 6 hours, accurately weighing, assembling and pressing, annealing for 3 hours at 800 ℃ and 10-4Pa in high vacuum, and synthesizing the polycrystalline cubic boron nitride composite sheet for the high-end cutter in a cubic boron nitride hydraulic press at 95MPa and 1400 ℃ for 30 minutes.
The percentage of the invention is weight percentage. The service life of the polycrystalline cubic boron nitride composite sheet prepared by the method is prolonged by 20%; and has hardness HV4000, heat resistance 1500 deg.C, friction coefficient 0.3, and elastic modulus 650 Gpa.
Example 2
The invention provides a production method of a polycrystalline cubic boron nitride composite sheet, which comprises the following steps:
1) mixing 46 percent of cubic boron nitride particles with the average particle size of 1-2 microns, 43 percent of cubic boron nitride particles with the average particle size of 3-5 microns and 3 percent of titanium carbon nitride in a mixing tank for 19 minutes; 5 percent of urea is added and mixed for 25 minutes,
2) and adding 3% of vanadium carbide, mixing for 10 hours, accurately weighing, assembling and pressing, annealing for 5 hours at 1000 ℃ and 10-4Pa in high vacuum, and synthesizing the polycrystalline cubic boron nitride composite sheet for the high-end cutter in a cubic boron nitride hydraulic press at 97MPa and 1500 ℃ for 40 minutes.
The service life of the polycrystalline cubic boron nitride composite sheet prepared by the method is prolonged by 20%; and has hardness HV5000, heat resistance 1450 deg.C, friction coefficient 0.2, and elastic modulus 660 GPa.
Example 3
As shown in fig. 1, fig. 2, fig. 3 and fig. 4, the invention also discloses a mixing tank, which comprises a tank body 1, wherein a stirring rod 2 and a fixed frame 3 are inserted into the tank body from top to bottom, and the top of the stirring rod is in transmission connection with a driving motor 4; the fixed frame is equipped with and has gapped first charging barrel 5 with the stirring rod, and the stirring rod is located and is equipped with a pair of first stirring leaf 6 in the first charging barrel. And a second stirring blade 7 is arranged at the bottom of the stirring rod which extends out of the first charging barrel downwards. The stirring rod penetrates through the first charging barrel and extends downwards into the bottom of the pipe body; the upper area of the first charging barrel is provided with a filtering hole 8; a rectangular second charging barrel 9 is fixed on the upper part of the first charging barrel of the stirring rod; the second charging barrel comprises an inner barrel 11 and an outer barrel 10 which are fixed on the stirring rod; the bottom of the inner cylinder is provided with a cutting blade 12, the bottom end of the cutting blade is hinged with the inner cylinder, the top of the cutting blade is provided with a sealing silica gel 13, and the sealing silica gel divides the second charging cylinder into a charging cavity 14 and a movable cavity 15 which are positioned at the upper part and used for charging urea; the cutting edge of cutting blade is just to sealing silica gel for cut sealing silica gel at the effect of the centrifugal force of stirring rod. The bottom of the inner cylinder is provided with a hinged support 16, the bottom of the cutting blade is hinged to the hinged support, and a torsion spring 17 is further arranged between the cutting blade and the hinged support and used for enabling the cutting blade to retract the inner cylinder.
The first cartridge comprises a barrel 18 fixed to a fixed frame and an arc-shaped protective dome 19 at the top of the barrel. The protective dome is provided with a charging barrel 20. A feeding pipe 21 extending downwards is fixed at the top of the tank body; the bottom of the tank body is provided with a discharge pipe 22, and the discharge pipe is provided with a control valve 23.
In the implementation of the embodiment, 44% -46% of cubic boron nitride particles with the average particle size of 1-2 microns, 43% -46% of cubic boron nitride particles with the average particle size of 3-5 microns and 1% -5% of titanized carbon nitride are filled into a first charging barrel in advance and mixed; charging urea into a second charging barrel; when 44% -46% of cubic boron nitride particles with the average particle size of 1-2 microns, 43% -46% of cubic boron nitride particles with the average particle size of 3-5 microns and 1% -5% of titanium carbonitride are mixed, the mixing is finished; the stirring evaluation rate of the stirring rod is further increased, the cutting edge of the cutting blade is opposite to the sealing silica gel, and the sealing silica gel is cut under the action of the centrifugal force of the stirring rod; the urea is slowly put into the first charging barrel, and after the material of the first charging barrel overflows and exceeds the lowest position of the filtering hole, the material is further thrown out after being filtered through the filtering hole under the action of the centrifugal force of the stirring rod, enters the bottom of the tank body and is stirred and mixed again.
The above embodiments are only used for illustrating the present invention, and the structure, connection mode and the like of each component can be changed, and all equivalent changes and improvements made on the basis of the technical scheme of the present invention should not be excluded from the protection scope of the present invention.
Claims (1)
1. A production method of a polycrystalline cubic boron nitride composite sheet is characterized by comprising the following steps:
1) mixing 44-46% of cubic boron nitride particles with the average particle size of 1-2 microns, 43-46% of cubic boron nitride particles with the average particle size of 3-5 microns and 1-5% of titanium carbonitride in a mixing tank for 17-19 minutes; adding 1-5% of urea, mixing for 15-25 minutes,
2) adding 1-5% vanadium carbide, mixing for 6-10 hr, accurately weighing, assembling and pressing at 800-1000 deg.C and 10 deg.C under high vacuum-4Annealing for 3-5 hours under the condition of Pa, and synthesizing the polycrystalline cubic boron nitride composite sheet for the high-end cutter in a cubic hydraulic press under the conditions of 95-97MPa and 1400-1500 ℃, wherein the synthesis time is 30-40 minutes; the mixing tank comprises a tank body, a stirring rod and a fixing frame are inserted into the tank body from top to bottom, a first charging barrel with a gap with the stirring rod is arranged on the fixing frame, and the stirring rod penetrates through the first charging barrel and extends downwards into the bottom of the tank body; a filter hole is formed in the upper area of the first charging barrel; a rectangular second charging barrel is fixed on the stirring rod at the upper part of the first charging barrel; the second charging barrel comprises an inner barrel and an outer barrel which are fixed on the stirring rod; the bottom of the inner cylinder is provided with a cutting blade, the bottom end of the cutting blade is hinged with the inner cylinder, the top of the cutting blade is provided with sealing silica gel, and the sealing silica gel divides the second charging cylinder into a charging cavity and a movable cavity which are positioned at the upper part and used for charging urea; the cutting edge of the cutting blade is opposite to the sealing silica gel and used for cutting the sealing silica gel under the action of centrifugal force of the stirring rod; the bottom of the inner cylinder is provided with a hinged support, the bottom of the cutting blade is hinged with the hinged support, and a torsion spring is arranged between the cutting blade and the hinged support and used for enabling the cutting blade to retract into the inner cylinder; the first charging barrel comprises a barrel body fixed on the fixed frame and an arc-shaped protection dome positioned at the top of the barrel body; a charging barrel is arranged on the protective dome; the top of the stirring rod is in transmission connection with a driving motor; the stirring rod is positioned in the first charging barrel and is internally provided with a pair of first stirring blades; the stirring rod extends downwards out of the bottom of the first charging barrel and is provided with a second stirring blade; a feeding pipe extending downwards is fixed at the top of the tank body; the bottom of the tank body is provided with a discharge pipeAnd the discharge pipe is provided with a control valve.
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