High-strength wear-resistant numerical control blade for cutting electronic parts and preparation process thereof

Abstract

The invention provides a high-strength wear-resistant numerical control blade for cutting electronic parts and a preparation process of the high-strength wear-resistant numerical control blade. The preparation process of the high-strength wear-resistant numerical control blade for cutting the electronic parts comprises the following steps: adding the aluminum oxide and the zinc oxide, and homogenizing and mixing; adding other components and uniformly mixing; performing cold press molding and sintering; surface pretreatment; and performing microwave plasma chemical vapor deposition on the diamond film. Boron nitride micro powder is used as a main raw material, aluminum oxide, zinc oxide, paraffin, microcrystalline wax and the like are matched for cold press molding and sintering to manufacture the base body blade, and then the diamond film is deposited on the surface of the base body blade to manufacture the numerical control blade which is high in hardness, high in abrasion resistance and high in precision. The interface bonding force between the diamond film and the substrate blade is strong, the diamond film is not easy to fall off, and the diamond film is suitable for cutting materials such as electronic parts with high precision requirements.

Description

Technical Field

[0001] The present invention relates to the field of numerical control cutting tools, and particularly relates to a high-strength and wear-resistant numerical control cutting tool for electronic component cutting and a preparation process thereof. Background Art

[0002] Numerical control cutting tools are the general term for indexable turning inserts, which can be mainly divided into coated inserts, cermet inserts, cemented carbide inserts, diamond inserts and other types. Diamond inserts have the characteristics of high hardness, good wear resistance and excellent chemical corrosion resistance, and can be widely used in precision machining fields such as the microelectronics field, optical systems, household appliances and precision instrument parts.

[0003] At present, existing numerical control cutting tools for high-precision machining usually use cemented carbide as the substrate material, and then prepare a diamond film on the surface of the cemented carbide substrate material. However, cobalt in the cemented carbide substrate will produce a graphitization-promoting effect, resulting in a low diamond nucleation density and a poor interfacial bonding force between the diamond film and the substrate, thereby affecting the service life of the numerical control cutting tool.

[0004] Therefore, we propose a high-strength and wear-resistant numerical control cutting tool for electronic component cutting with a strong interfacial bonding force between the film and the substrate and a preparation process thereof to extend the service life of the numerical control cutting tool. Summary of the Invention

[0005] Aiming at the deficiencies of the existing technology, the purpose of the present invention is to provide a high-strength and wear-resistant numerical control cutting tool for electronic component cutting and a preparation process thereof.

[0006] A high-strength and wear-resistant numerical control cutting tool for electronic component cutting is composed of a substrate blade and a diamond film. Among them, the substrate blade includes the following components: 80 - 90 parts of boron nitride micropowder, 10 - 15 parts of alumina, 3 - 5 parts of zinc oxide, 6 - 8 parts of paraffin wax, 2 - 3 parts of microcrystalline wax, 1 - 3 parts of carnauba wax, 3 - 5 parts of polypropylene and ethylene-vinyl acetate copolymer, and 1 - 2 parts of stearic acid.

[0007] Furthermore, a preparation process of a high-strength and wear-resistant numerical control cutting tool for electronic component cutting includes the following steps: S1: Add alumina and zinc oxide and mix them homogeneously Ball-mill and mix alumina and zinc oxide, and then homogeneously mix them with boron nitride micropowder to obtain a mixed powder; S2: Add other components and mix them evenly Mix the above-mentioned mixed powder evenly with paraffin wax, microcrystalline wax, carnauba wax, polypropylene, ethylene-vinyl acetate copolymer and stearic acid to obtain a mixed material; S3: Cold press into shape and sinter The above-mentioned mixed materials are cold-pressed into green blank blades, and then the green blank blades are sintered at high temperature and high pressure to obtain matrix blades; S4: Surface pretreatment The above-mentioned matrix blades are polished with a polishing machine, and then the polished matrix blades are ultrasonically cleaned 2-3 times with acetone, alcohol and deionized water respectively. Then, the cleaned matrix blades are ultrasonically oscillated in a diamond suspension for 30-40 min, and then ultrasonically cleaned in an alcohol solution for 6-8 min. Finally, they are put into an oven and dried with high-pressure nitrogen to obtain pretreated matrix blades; S5: Microwave plasma chemical vapor deposition of diamond film The above-mentioned pretreated matrix blades are placed in a microwave plasma chemical vapor deposition device, and a uniform diamond film is prepared on the surface of the pretreated matrix blades to obtain high-strength and wear-resistant CNC blades.

[0008] Furthermore, the addition of alumina and zinc oxide and homogeneous mixing in step S1 specifically includes the following steps: S1.1: Alumina and zinc oxide are added together into a ball mill and ball-milled for 1-2 h to obtain mixed metal oxide powder; S1.2: Open the discharge valve of the ball mill, and add the mixed metal oxide powder into the homogenizer. When the first gravity sensor in the homogenizer detects that the gravity in the homogenizer starts to increase, the first gravity sensor sends a signal to the controller; S1.3: After the controller receives the signal sent by the first gravity sensor, it controls the feed assembly of the homogenizer to open, and adds boron nitride micropowder into the homogenizer through the feed assembly; S1.4: Until the first gravity sensor detects that the gravity in the homogenizer no longer increases, the first gravity sensor sends a signal to the controller again; S1.5: After the controller receives the signal sent by the first gravity sensor again, it controls the homogenizer to start. After homogenizing for 40-50 min, mixed powder is obtained.

[0009] Furthermore, the addition of other components and uniform mixing in step S2 specifically includes the following steps: S2.1: The controller controls the discharge assembly of the homogenizer to open, and pours the mixed powder prepared in step S1.5 into a double-screw mixer through the discharge assembly; S2.2: Until the second gravity sensor in the double-screw mixer detects that the gravity in the double-screw mixer no longer increases, the second gravity sensor sends a signal to the controller; S2.3: After the controller receives the signal sent by the gravity sensor, it controls the feeder to add paraffin wax, microcrystalline wax, carnauba wax, polypropylene, ethylene-vinyl acetate copolymer and stearic acid into the double-screw mixer; S2.4: Until the second gravity sensor detects that the gravity inside the double - helix mixer no longer increases again, the second gravity sensor sends a signal to the controller again; S2.5: After the controller receives the signal sent by the second gravity sensor again, it controls the double - helix mixer to mix at a rate of 5 - 10 r / min for 10 - 20 min first, and then mix at a rate of 15 - 25 r / min for 30 - 35 min to obtain the mixed material.

[0010] Further, the cold pressing, forming and sintering in step S3 specifically include the following steps: S3.1: Add the mixed material obtained in step S2.5 into the forming die, adjust the pressure of the cold - pressing forming machine to 4 - 5 MPa, and then put the forming die into the cold - pressing forming machine for cold pressing to obtain the green - body blade; S3.2: Put the above - mentioned green - body blade into the pyrophyllite die and place it in the anvil combination cavity of the six - sided top press. Adjust the pressure of the six - sided top press to 6 - 8 GPa, the temperature to 1300 - 1500 °C, and sinter at high temperature and high pressure for 20 - 30 min to obtain the matrix blade.

[0011] Further, the microwave plasma chemical vapor deposition of diamond film in step S5 specifically includes the following steps: S5.1: Place the pretreated matrix blade obtained in step S4 on the carrier stage inside the microwave plasma chemical vapor deposition device, and adjust the microwave power to 8 - 10 kW; S5.2: Introduce the reaction gas from the top of the reaction chamber until the air pressure in the chamber is 6 - 8 kPa, and then start the microwave generator; S5.3: The microwave generated by the microwave generator is transmitted to the reaction chamber through the waveguide, reacts with the reaction gas in the reaction chamber to generate a plasma sphere, and a uniform diamond film is prepared above the pretreated matrix blade through the plasma sphere; S5.4: After depositing for 2 - 3 h, turn over the matrix blade with the diamond film deposited on the upper surface, repeat the above operation, and prepare a uniform diamond film on the lower surface of the matrix blade with the diamond film deposited on the upper surface to obtain the high - strength and wear - resistant CNC blade.

[0012] Further, during the reaction of microwave and reaction gas in step S5.3, when the piston in the reaction chamber moves outward, the first air pressure sensor inside the piston sends a signal to the controller. After receiving the signal sent by the first air pressure sensor, the controller controls the vacuum pump at the bottom of the reaction chamber to start, evacuating and decompressing the inside of the reaction chamber until the piston returns to the initial position. When the piston moves inward, the second air pressure sensor outside the piston sends a signal to the controller. After receiving the signal sent by the second air pressure sensor, the controller controls the air pump at the upper part of the reaction chamber to introduce the reaction gas into the reaction chamber until the piston returns to the initial position.

[0013] Further, the reaction gas is a mixed gas of hydrogen and methane, and the volume fraction of methane is 6 - 8%.

[0014] Compared with the prior art, the advantages and beneficial effects of the present invention are as follows: 1. The numerical control cutting tool of the present invention is made by using boron nitride micropowder as the main raw material, cooperating with alumina, zinc oxide, paraffin wax, microcrystalline wax, etc., through cold pressing and sintering to form a matrix blade, and then depositing a diamond film on the surface of the matrix blade. It not only has strong wear resistance, but also has a strong interfacial bonding force between the diamond film and the matrix blade, is not easy to fall off, and is suitable for cutting materials with high precision requirements such as electronic components.

[0015] 2. The present invention uses a double - helix mixer to uniformly mix the mixed powder materials with paraffin wax, microcrystalline wax, carnauba wax, etc., which can improve the density distribution uniformity of the mixed materials, make the density distribution of the matrix blade obtained by pressing and sintering uniform, and improve the dimensional accuracy of the prepared numerical control cutting tool.

[0016] 3. The present invention uses microcrystalline wax, carnauba wax and paraffin wax in combination, which can reduce the shrinkage during the solidification of paraffin wax, thereby improving the density uniformity of the sintered matrix blade. In addition, by utilizing the decomposition temperature gradient of polypropylene and ethylene - vinyl acetate copolymer, the density uniformity of the matrix blade can be further ensured.

[0017] 4. The present invention cleans the surface of the matrix blade with acetone, alcohol, etc., and then places it in a diamond suspension for ultrasonic oscillation, which can improve the nucleation density on the surface of the matrix blade. Then, by depositing a diamond film through microwave plasma chemical vapor deposition, the interfacial bonding force between the diamond film and the surface of the matrix blade can be further improved, achieving the effect of extending the service life of the prepared numerical control cutting tool. Description of the Drawings

[0018] Figure 1 It is a process flow chart of the preparation of a high - strength and wear - resistant numerical control cutting tool for cutting electronic components adopted in the embodiment of the present invention.

[0019] Figure 2Summary table of the performance test results of Embodiment 1, Embodiment 2, and Embodiment 3 of the present invention.

[0020] Figure 3 Summary table of the performance test results of Embodiment 1 of the present invention and Comparative Example 1.

[0021] Figure 4 Summary table of the performance test results of Embodiment 1 of the present invention and Comparative Example 2.

[0022] Figure 5 Summary table of the performance test results of Embodiment 1 of the present invention and Comparative Example 3.

[0023] Figure 6 Summary table of the performance test results of Embodiment 1 of the present invention and Comparative Example 4. Detailed implementation manners

[0024] The present invention will be further described in detail below with reference to specific embodiments.

[0025] Embodiment 1: A preparation process of a high-strength and wear-resistant numerical control blade for cutting electronic components, as Figure 1 and Figure 2 shown, includes the following steps: S1: Add alumina and zinc oxide and mix them homogeneously Add 10 parts of alumina and 3 parts of zinc oxide into a ball mill and ball mill for 1 h to obtain a mixed metal oxide powder. Then open the discharge valve of the ball mill and add the mixed metal oxide powder into a homogenizer. When the first gravity sensor in the homogenizer detects that the gravity in the homogenizer starts to increase, the first gravity sensor sends a signal to the controller. After receiving the signal sent by the first gravity sensor, the controller controls the feeding component of the homogenizer to open, and adds 80 parts of boron nitride micropowder into the homogenizer through the feeding component until the first gravity sensor detects that the gravity in the homogenizer no longer increases. Then the first gravity sensor sends a signal to the controller again. After receiving the signal sent by the first gravity sensor again, the controller controls the homogenizer to start. After homogenizing for 40 min, a mixed powder is obtained; S2: Add other components and mix them evenly The controller controls the opening of the discharging component of the homogenizer, and pours the above-mentioned mixed powder into the twin-screw mixer through the discharging component. When the second gravity sensor in the twin-screw mixer detects that the gravity in the twin-screw mixer no longer increases, the second gravity sensor sends a signal to the controller. After receiving the signal sent by the gravity sensor, the controller controls the feeding machine to add 6 parts of paraffin wax, 2 parts of microcrystalline wax, 1 part of carnauba wax, 3 parts of polypropylene and ethylene-vinyl acetate copolymer, and 1 part of stearic acid into the twin-screw mixer. When the second gravity sensor detects again that the gravity in the twin-screw mixer no longer increases, the second gravity sensor sends a signal to the controller again. After receiving the signal sent by the second gravity sensor again, the controller controls the twin-screw mixer to mix at a rate of 5 r / min for 10 min first, and then mix at a rate of 15 r / min for 30 min to obtain a mixed material; S3: Cold pressing and sintering Add the above-mentioned mixed material into the forming die, adjust the pressure of the cold pressing machine to 4 MPa, then put the forming die into the cold pressing machine for cold pressing to obtain a green blade blank. Then put the green blade blank into the pyrophyllite die and place it in the anvil combination cavity of the six-sided top press. Adjust the pressure of the six-sided top press to 6 GPa, the temperature to 1300 °C, and sinter at high temperature and high pressure for 20 min to obtain a matrix blade; S4: Surface pretreatment Polish the above-mentioned matrix blade with a polishing machine, then ultrasonically clean the polished matrix blade 2 times with acetone, alcohol and deionized water respectively. Then place the cleaned matrix blade in a diamond suspension for ultrasonic oscillation for 30 min, then ultrasonically clean it in an alcohol solution for 6 min, and finally put it into an oven and dry it with high-pressure nitrogen to obtain a pretreated matrix blade; S5: Microwave plasma chemical vapor deposition of diamond film Place the above-mentioned pretreated matrix blade on the carrier stage inside the microwave plasma chemical vapor deposition device, adjust the microwave power to 8 kW, and then introduce a reaction gas mixture of hydrogen and methane with a volume fraction of 6% from the top of the reaction chamber until the pressure inside the chamber reaches 6 kPa. Then start the microwave generator. The microwave generated by the microwave generator is transmitted to the reaction chamber through the waveguide and reacts with the reaction gas in the reaction chamber to generate a plasma sphere. A uniform diamond film is prepared above the pretreated matrix blade through the plasma sphere. During this process, if the piston inside the reaction chamber moves outward, the first pressure sensor inside the piston sends a signal to the controller. After receiving the signal sent by the first pressure sensor, the controller controls the vacuum pump at the bottom of the reaction chamber to start and evacuate and decompress the inside of the reaction chamber until the piston returns to its initial position. If the piston moves inward, the second pressure sensor outside the piston sends a signal to the controller. After receiving the signal sent by the second pressure sensor, the controller controls the air pump at the upper part of the reaction chamber to introduce the reaction gas into the reaction chamber until the piston returns to its initial position. After 2 hours of deposition, turn over the matrix blade with the diamond film deposited on its upper surface and repeat the above operation to prepare a uniform diamond film on the lower surface of the matrix blade with the diamond film deposited on its upper surface, obtaining a high-strength and wear-resistant CNC blade.

[0026] Then, conduct various performance tests on the obtained high-strength and wear-resistant CNC blade: First, fix the CNC blade with a standard tool holder and place the tool holder horizontally on the marble platform. Use a digital display micrometer to measure the tip height of the CNC blade, and then calculate that the height range of the blade is approximately 0.0042 mm. Secondly, use the prepared CNC blade to continuously cut and process fiberglass for 2 hours, and then use a digital display micrometer to measure that the flank wear heights of the processed CNC blade are approximately 0.012 mm, 0.009 mm, and 0.015 mm respectively, and the average wear height is approximately 0.012 mm. At the same time, after cutting for 2 hours, it is observed that the diamond film does not peel off.

[0027] Example 2: A preparation process for a high-strength and wear-resistant CNC blade for cutting electronic components, as Figure 1 and Figure 2 shown, includes the following steps: S1: Add alumina and zinc oxide and mix them homogeneously Add 12 parts of alumina and 4 parts of zinc oxide into a ball mill and ball mill for 1.5 h to obtain a mixed metal oxide powder. Then open the discharge valve of the ball mill and add the mixed metal oxide powder into a homogenizer. When the first gravity sensor in the homogenizer detects that the gravity in the homogenizer starts to increase, the first gravity sensor sends a signal to the controller. After receiving the signal sent by the first gravity sensor, the controller controls the feeding assembly of the homogenizer to open and add 85 parts of boron nitride micropowder into the homogenizer through the feeding assembly until the first gravity sensor detects that the gravity in the homogenizer no longer increases. At this time, the first gravity sensor sends a signal to the controller again. After receiving the signal sent by the first gravity sensor again, the controller controls the homogenizer to start. After homogenizing for 45 min, a mixed powder is obtained. S2: Add other components and mix them evenly The controller controls the discharge assembly of the homogenizer to open and pour the above-mentioned mixed powder into a twin-screw mixer until the second gravity sensor in the twin-screw mixer detects that the gravity in the twin-screw mixer no longer increases. At this time, the second gravity sensor sends a signal to the controller. After receiving the signal sent by the gravity sensor, the controller controls the feeding machine to add 7 parts of paraffin wax, 2 parts of microcrystalline wax, 2 parts of carnauba wax, 4 parts of polypropylene and ethylene-vinyl acetate copolymer, and 1 part of stearic acid into the twin-screw mixer until the second gravity sensor detects that the gravity in the twin-screw mixer no longer increases again. At this time, the second gravity sensor sends a signal to the controller again. After receiving the signal sent by the second gravity sensor again, the controller controls the twin-screw mixer to mix at a rate of 7 r / min for 15 min first, and then mix at a rate of 20 r / min for 32 min to obtain a mixed material. S3: Cold pressing and sintering Add the above-mentioned mixed material into a forming mold, adjust the pressure of the cold pressing machine to 4.5 MPa, then put the forming mold into the cold pressing machine for cold pressing to obtain a green blade. Then put the green blade into a pyrophyllite mold and place it in the anvil combination cavity of a cubic press. Adjust the pressure of the cubic press to 7 GPa and the temperature to 1400 °C, and sinter at high temperature and high pressure for 25 min to obtain a matrix blade. S4: Surface pretreatment Polish the above-mentioned matrix blade with a polishing machine, then ultrasonically clean the polished matrix blade 2 times with acetone, alcohol and deionized water respectively. Then place the cleaned matrix blade in a diamond suspension for ultrasonic oscillation for 35 min, then ultrasonically clean it in an alcohol solution for 7 min, and finally put it into an oven and dry it with high-pressure nitrogen to obtain a pretreated matrix blade. S5: Microwave plasma chemical vapor deposition of diamond film Place the above-mentioned pre-treated substrate blade on the carrier stage inside the microwave plasma chemical vapor deposition device, adjust the microwave power to 9 kW, and then introduce a reaction gas mixture of hydrogen and methane with a volume fraction of 7% from the top of the reaction chamber until the pressure inside the chamber reaches 7 kPa. Then start the microwave generator. The microwave generated by the microwave generator is transmitted to the reaction chamber through the waveguide and reacts with the reaction gas in the reaction chamber to generate a plasma sphere. A uniform diamond film is prepared above the pre-treated substrate blade through the plasma sphere. During this process, when the piston inside the reaction chamber moves outward, the first pressure sensor inside the piston sends a signal to the controller. After receiving the signal sent by the first pressure sensor, the controller controls the vacuum pump at the bottom of the reaction chamber to start and evacuate and decompress the inside of the reaction chamber until the piston returns to its initial position. When the piston moves inward, the second pressure sensor outside the piston sends a signal to the controller. After receiving the signal sent by the second pressure sensor, the controller controls the air pump at the upper part of the reaction chamber to introduce the reaction gas into the reaction chamber until the piston returns to its initial position. After depositing for 2.5 h, turn over the substrate blade with the diamond film deposited on its upper surface and repeat the above operations to prepare a uniform diamond film on the lower surface of the substrate blade with the diamond film deposited on its upper surface, obtaining a high-strength and wear-resistant CNC blade.

[0028] Then, conduct various performance tests on the obtained high-strength and wear-resistant CNC blade: First, fix the CNC blade with a standard tool holder and place the tool holder horizontally on the marble platform. Use a digital display micrometer to measure the tip height of the CNC blade, and then calculate that the height range of the blade is approximately 0.0035 mm. Secondly, continuously cut the fiberglass with the prepared CNC blade for 2 h, and then use a digital display micrometer to measure the flank wear heights of the processed CNC blade, which are approximately 0.008 mm, 0.011 mm, and 0.009 mm respectively, and the average wear height is approximately 0.009 mm. At the same time, after cutting for 2 h, it is observed that the diamond film does not peel off.

[0029] Example 3: A preparation process for a high-strength and wear-resistant CNC blade for cutting electronic components, as Figure 1 and Figure 2 shown, includes the following steps: S1: Add alumina and zinc oxide and mix them homogeneously Add 15 parts of aluminum oxide and 5 parts of zinc oxide into a ball mill and ball mill for 2 hours to obtain a mixed metal oxide powder. Then open the discharge valve of the ball mill and add the mixed metal oxide powder into a homogenizer. When the first gravity sensor in the homogenizer detects that the gravity in the homogenizer starts to increase, the first gravity sensor sends a signal to the controller. After receiving the signal sent by the first gravity sensor, the controller controls the feeding component of the homogenizer to open and add 90 parts of boron nitride micropowder into the homogenizer through the feeding component until the first gravity sensor detects that the gravity in the homogenizer no longer increases. Then the first gravity sensor sends a signal to the controller again. After receiving the signal sent by the first gravity sensor again, the controller controls the homogenizer to start. After homogenizing for 50 minutes, a mixed powder is obtained. S2: Add other components and mix them evenly The controller controls the discharge component of the homogenizer to open and pour the above-mentioned mixed powder into a twin-screw mixer until the second gravity sensor in the twin-screw mixer detects that the gravity in the twin-screw mixer no longer increases. Then the second gravity sensor sends a signal to the controller. After receiving the signal sent by the gravity sensor, the controller controls the feeder to add 8 parts of paraffin wax, 3 parts of microcrystalline wax, 3 parts of carnauba wax, 5 parts of polypropylene and ethylene-vinyl acetate copolymer, and 1 - 2 parts of stearic acid into the twin-screw mixer until the second gravity sensor detects that the gravity in the twin-screw mixer no longer increases again. Then the second gravity sensor sends a signal to the controller again. After receiving the signal sent by the second gravity sensor again, the controller controls the twin-screw mixer to mix at a rate of 10 r / min for 20 minutes and then at a rate of 25 r / min for 35 minutes to obtain a mixed material. S3: Cold press and sinter Add the above-mentioned mixed material into a forming mold, adjust the pressure of the cold press to 5 MPa, then put the forming mold into the cold press for cold pressing to obtain a green blade. Then put the green blade into a pyrophyllite mold and place it in the anvil combination cavity of a cubic press. Adjust the pressure of the cubic press to 8 GPa and the temperature to 1500 °C, and sinter at high temperature and high pressure for 30 minutes to obtain a matrix blade. S4: Surface pretreatment Polish the above-mentioned matrix blade with a polishing machine, then ultrasonically clean the polished matrix blade 3 times with acetone, alcohol, and deionized water respectively. Then place the cleaned matrix blade in a diamond suspension for ultrasonic oscillation for 40 minutes, then ultrasonically clean it in an alcohol solution for 8 minutes, and finally put it into an oven and dry it with high-pressure nitrogen to obtain a pretreated matrix blade. S5: Microwave plasma chemical vapor deposition of diamond film Place the above pretreated matrix blade on the carrier stage inside the microwave plasma chemical vapor deposition device, adjust the microwave power to 10 kW, and then introduce a reaction gas mixture of hydrogen and methane with a volume fraction of 8% from the top of the reaction chamber until the air pressure in the chamber reaches 8 kPa. Then start the microwave generator. The microwave generated by the microwave generator is transmitted to the reaction chamber through the waveguide and reacts with the reaction gas in the reaction chamber to generate a plasma sphere. A uniform diamond film is prepared above the pretreated matrix blade through the plasma sphere. During this process, if the piston in the reaction chamber moves outward, the first air pressure sensor inside the piston sends a signal to the controller. After receiving the signal sent by the first air pressure sensor, the controller controls the vacuum pump at the bottom of the reaction chamber to start and evacuate and decompress the inside of the reaction chamber until the piston returns to its initial position. If the piston moves inward, the second air pressure sensor outside the piston sends a signal to the controller. After receiving the signal sent by the second air pressure sensor, the controller controls the air pump at the upper part of the reaction chamber to introduce the reaction gas into the reaction chamber until the piston returns to its initial position. After depositing for 3 h, turn over the matrix blade with the diamond film deposited on its upper surface, repeat the above operation, and prepare a uniform diamond film on the lower surface of the matrix blade with the diamond film deposited on its upper surface to obtain a high-strength and wear-resistant CNC blade.

[0030] Then, conduct various performance tests on the obtained high-strength and wear-resistant CNC blade: First, fix the CNC blade with a standard tool holder clamp, place the tool holder horizontally on the marble platform, measure the tip height of the CNC blade with a digital display micrometer, and then calculate that the height range of the blade is about 0.0033 mm. Secondly, continuously cut and process the fiberglass with the obtained CNC blade for 2 h, and then use a digital display micrometer to measure that the flank wear heights of the processed CNC blade are about 0.013 mm, 0.005 mm, and 0.007 mm respectively, and the average wear height is about 0.008 mm. At the same time, after cutting for 2 h, it is observed that the diamond film does not peel off.

[0031] Comparative Example 1: A preparation process of a high-strength and wear-resistant CNC blade for electronic component cutting. Refer to the preparation steps of Example 1, with other conditions unchanged, only remove Step S1, Step S2, and Step S3, and replace the matrix blade in Step S4 with a Co-containing cemented carbide blade.

[0032] Then, conduct various performance tests on the obtained high-strength and wear-resistant CNC blade: First, fix the CNC blade with a standard tool holder clamp, place the tool holder horizontally on the marble platform, measure the tip height of the CNC blade with a digital display micrometer, and then calculate that the height range of the blade is about 0.0112 mm. Secondly, the prepared CNC cutting tool was used to continuously cut and process the fiberglass for 2 h. Then, a digital display micrometer was used to measure the flank wear heights of the processed CNC cutting tools, which were approximately 0.018 mm, 0.012 mm, and 0.021 mm respectively, and the average wear height was approximately 0.017 mm. At the same time, after cutting for 2 h, spalling of the diamond film was observed.

[0033] As Figure 3 shown, by comparing the performance test results of the above Example 1, it can be seen that the CNC cutting tool made by using boron nitride micropowder as the main raw material, cooperating with alumina, zinc oxide, paraffin wax, and microcrystalline wax, etc., through cold pressing and sintering to form a matrix blade, and then depositing a diamond film on the surface of the matrix blade, not only has strong wear resistance, but also has a strong interfacial bonding force between the diamond film and the matrix blade, is not easy to fall off, and is suitable for cutting materials with high precision requirements such as electronic components.

[0034] Comparative Example 2: A preparation process of a high-strength and wear-resistant CNC cutting tool for cutting electronic components. Referring to the preparation steps of Example 1, with other conditions unchanged, only step S4 was removed.

[0035] Then, various performance tests were carried out on the prepared high-strength and wear-resistant CNC cutting tool: First, the CNC cutting tool was fixed by clamping with a standard tool shank, the tool shank was placed horizontally on a marble platform, a digital display micrometer was used to measure the tip height of the CNC cutting tool, and then the height range of the cutting tool was calculated to be approximately 0.0039 mm; Secondly, the prepared CNC cutting tool was used to continuously cut and process the fiberglass for 2 h. Then, a digital display micrometer was used to measure the flank wear heights of the processed CNC cutting tools, which were approximately 0.014 mm, 0.011 mm, and 0.008 mm respectively, and the average wear height was approximately 0.011 mm. At the same time, after cutting for 2 h, spalling of the diamond film was observed.

[0036] As Figure 4 shown, by comparing the performance test results of the above Example 1, it can be seen that by cleaning the surface of the matrix blade with acetone and alcohol, etc., and then placing it in a diamond suspension for ultrasonic oscillation, the nucleation density on the surface of the matrix blade can be improved, and then by microwave plasma chemical vapor deposition of the diamond film, the interfacial bonding force between the diamond film and the surface of the matrix blade can be further improved, achieving the effect of extending the service life of the prepared CNC cutting tool.

[0037] Comparative Example 3: A preparation process of a high-strength and wear-resistant CNC cutting tool for cutting electronic components. Referring to the preparation steps of Example 1, with other conditions unchanged, only the microcrystalline wax, carnauba wax, polypropylene, and ethylene-vinyl acetate copolymer in step S2 were replaced with an equal amount of paraffin wax.

[0038] Then, various performance tests were carried out on the prepared high-strength and wear-resistant CNC cutting tools: First, the CNC cutting tool was fixed by clamping with a standard tool shank. The tool shank was placed horizontally on a marble platform, and a digital display micrometer was used to measure the tip height of the CNC cutting tool. Then, through calculation, the range of the cutting tool height was about 0.8633 mm. Secondly, the prepared CNC cutting tool was used to continuously cut and process the fiberglass for 2 h. Then, a digital display micrometer was used to measure the flank wear heights of the processed CNC cutting tools, which were about 0.017 mm, 0.013 mm, and 0.019 mm respectively, and the average wear height was about 0.016 mm. At the same time, after cutting for 2 h, it was observed that the diamond film did not peel off.

[0039] As Figure 5 shown, by comparing the performance test results of Example 1, it can be seen that by using microcrystalline wax, carnauba wax and paraffin wax in combination, the shrinkage during the solidification of paraffin wax can be reduced, thereby improving the density uniformity of the sintered matrix cutting tool. In addition, by utilizing the decomposition temperature gradient of polypropylene and ethylene-vinyl acetate copolymer, the density uniformity of the matrix cutting tool can be further ensured.

[0040] Comparative Example 4: A preparation process for a high-strength and wear-resistant CNC cutting tool for electronic component cutting. Referring to the preparation steps of Example 1, with other conditions unchanged, only the twin-screw mixer in Step S2 was replaced with an ordinary mixer.

[0041] Then, various performance tests were carried out on the prepared high-strength and wear-resistant CNC cutting tools: First, the CNC cutting tool was fixed by clamping with a standard tool shank. The tool shank was placed horizontally on a marble platform, and a digital display micrometer was used to measure the tip height of the CNC cutting tool. Then, through calculation, the range of the cutting tool height was about 0.7964 mm. Secondly, the prepared CNC cutting tool was used to continuously cut and process the fiberglass for 2 h. Then, a digital display micrometer was used to measure the flank wear heights of the processed CNC cutting tools, which were about 0.016 mm, 0.007 mm, and 0.009 mm respectively, and the average wear height was about 0.011 mm. At the same time, after cutting for 2 h, it was observed that the diamond film did not peel off.

[0042] As Figure 6 shown, by comparing the performance test results of the above Example 1, it can be seen that by using a twin-screw mixer to uniformly mix the mixed powder materials with paraffin wax, microcrystalline wax, carnauba wax, etc., the density distribution uniformity of the mixed materials can be improved, so that the density distribution of the matrix cutting tool obtained by pressing and sintering is uniform, in order to improve the dimensional accuracy of the prepared CNC cutting tool.

[0043] The above embodiments are only illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A high-strength and wear-resistant CNC blade for cutting electronic parts, characterized in that: It is composed of a base blade and a diamond film, wherein the base blade includes the following components: Boron nitride powder 80-90 parts, aluminum oxide 10-15 parts, zinc oxide 3-5 parts, paraffin wax 6-8 parts, microcrystalline wax 2-3 parts, carnauba wax 1-3 parts, polypropylene and ethylene-vinyl acetate copolymer 3-5 parts and stearic acid 1-2 parts.

2. A process for preparing a high-strength and wear-resistant CNC blade for cutting electronic parts as claimed in claim 1, characterized in that: The steps include: S1: Add aluminum oxide and zinc oxide and mix homogeneously Aluminum oxide and zinc oxide are ball-milled and mixed, and then homogeneously mixed with boron nitride powder to obtain a mixed powder; S2: Add other components and mix evenly The mixed powder is uniformly mixed with paraffin wax, microcrystalline wax, carnauba wax, polypropylene, ethylene-vinyl acetate copolymer and stearic acid to obtain a mixed material; S3: Cold pressing and sintering The mixed material is cold pressed to form a green blade, and the green blade is then sintered at high temperature and high pressure to obtain a base blade; S4: Surface preparation The substrate blade is polished with a polishing machine, and then the polished substrate blade is ultrasonically cleaned with acetone, alcohol and deionized water for 2-3 times respectively, and then the cleaned substrate blade is placed in a diamond suspension for ultrasonic vibration for 30-40 minutes, and then ultrasonically cleaned in an alcohol solution for 6-8 minutes, and finally placed in an oven and dried with high-pressure nitrogen to obtain a pretreated substrate blade; S5: Microwave plasma chemical vapor deposition of diamond thin films The pretreated substrate blade is placed in a microwave plasma chemical vapor deposition device, and a uniform diamond film is prepared on the surface of the pretreated substrate blade to obtain a high-strength and wear-resistant CNC blade.

3. The process for preparing a high-strength and wear-resistant CNC blade for cutting electronic parts according to claim 2, characterized in that: Step S1 of adding aluminum oxide and zinc oxide and homogeneously mixing them specifically includes the following steps: S1.1: Add aluminum oxide and zinc oxide into a ball mill and mill for 1-2 hours to obtain a mixed metal oxide powder; S1.2: Open the discharge valve of the ball mill and add the mixed metal oxide powder into the homogenizer. When the first gravity sensor in the homogenizer detects that the gravity in the homogenizer begins to increase, the first gravity sensor sends a signal to the controller; S1.3: After receiving the signal sent by the first gravity sensor, the controller controls the feed assembly of the homogenizer to open, and adds the boron nitride powder into the homogenizer through the feed assembly; S1.4: until the first gravity sensor detects that the gravity in the homogenizer no longer increases, the first gravity sensor sends a signal to the controller again; S1.5: After receiving the signal sent by the first gravity sensor again, the control starts the homogenizer, and after homogenizing for 40-50 minutes, a mixed powder is obtained.

4. The process for preparing a high-strength and wear-resistant CNC blade for cutting electronic parts according to claim 3, characterized in that: Step S2 of adding other components and uniformly mixing them specifically comprises the following steps: S2.1: The controller controls the discharge component of the homogenizer to start, and the mixed powder obtained in step S1.5 is poured into the double-screw mixer through the discharge component; S2.2: until the second gravity sensor in the double-screw mixer detects that the gravity in the double-screw mixer no longer increases, the second gravity sensor sends a signal to the controller; S2.3: After receiving the signal sent by the gravity sensor, the controller controls the feeder to add paraffin wax, microcrystalline wax, carnauba wax, polypropylene, ethylene-vinyl acetate copolymer and stearic acid into the double-screw mixer; S2.4: until the second gravity sensor detects that the gravity in the double-screw mixer no longer increases, the second gravity sensor sends a signal to the controller again; S2.5: After receiving the signal sent by the second gravity sensor again, the controller controls the double-screw mixer to mix at a rate of 5-10 r / min for 10-20 min, and then at a rate of 15-25 r / min for 30-35 min to obtain a mixed material.

5. The process for preparing a high-strength and wear-resistant CNC blade for cutting electronic parts according to claim 4, characterized in that: The cold pressing and sintering in step S3 specifically includes the following steps: S3.1: adding the mixed material obtained in step S2.5 into the forming mold, adjusting the pressure of the cold press forming machine to 4-5 MPa, and then placing the forming mold into the cold press forming machine for cold press forming to obtain a green blade; S3.2: Place the green blade into a pyrophyllite mold and place it in the top hammer assembly cavity of a six-sided top press. Adjust the pressure of the six-sided top press to 6-8 GPa and the temperature to 1300-1500°C. Sinter at high temperature and high pressure for 20-30 minutes to obtain a base blade.

6. The process for preparing a high-strength and wear-resistant CNC blade for cutting electronic parts according to claim 2, characterized in that: The microwave plasma chemical vapor deposition diamond film in step S5 specifically comprises the following steps: S5.1: placing the pretreated substrate blade obtained in step S4 on a stage in a microwave plasma chemical vapor deposition device, and adjusting the microwave power to 8-10 kW; S5.2: Introduce reaction gas from the top of the reaction chamber until the pressure in the chamber reaches 6-8 kPa, and then start the microwave generator; S5.3: The microwave generated by the microwave generator is transmitted to the reaction chamber through the waveguide, and reacts with the reaction gas in the reaction chamber to generate a plasma sphere, and a uniform diamond film is prepared on the pre-treated substrate blade through the plasma sphere; S5.4: After deposition for 2-3 hours, turn over the substrate blade with the diamond film deposited on the upper surface, repeat the above operation, and prepare a uniform diamond film on the lower surface of the substrate blade with the diamond film deposited on the upper surface to obtain a high-strength and wear-resistant CNC blade.

7. The process for preparing a high-strength and wear-resistant CNC blade for cutting electronic parts according to claim 6, characterized in that: During the reaction of microwaves and reaction gases in step S5.3, if the piston in the reaction chamber moves outward, the first air pressure sensor on the inside of the piston sends a signal to the controller. After receiving the signal sent by the first air pressure sensor, the controller controls the vacuum pump at the bottom of the reaction chamber to start, and evacuates and decompresses the inside of the reaction chamber until the piston returns to its initial position. If the piston moves inward, the second air pressure sensor on the outside of the piston sends a signal to the controller. After receiving the signal sent by the second air pressure sensor, the controller controls the air pump on the top of the reaction chamber to pass the reaction gas into the reaction chamber until the piston returns to its initial position.

8. The process for preparing a high-strength and wear-resistant CNC blade for cutting electronic parts according to claim 6, characterized in that: The reaction gas is a mixture of hydrogen and methane, wherein the volume fraction of methane is 6-8%.

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