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

Abstract

The application provides a high-strength wear-resistant numerical control blade for cutting electronic parts and a preparation process thereof. The preparation process of the high-strength wear-resistant numerical control blade for cutting electronic parts comprises the following steps: adding alumina and zinc oxide and homogeneously mixing; adding other components and uniformly mixing; cold-pressing forming and sintering; surface pretreatment; microwave plasma chemical vapor deposition of diamond film. The numerical control blade prepared by taking boron nitride powder as the main raw material, combining with alumina, zinc oxide, paraffin and microcrystalline wax and the like, cold-pressing forming, sintering to form a base blade and then depositing diamond film on the surface of the base blade has high hardness, strong wear resistance and high precision, the interface bonding force between the diamond film and the base blade is strong, the diamond film is not easy to fall off, and the numerical control blade is suitable for cutting materials with high precision requirements such as electronic parts.

Description

Technical Field

[0001] This invention relates to the field of CNC cutting tools, specifically to a high-strength, wear-resistant CNC cutting tool for cutting electronic components and its manufacturing process. Background Technology

[0002] CNC inserts are a general term for indexable turning inserts, which can be mainly divided into coated inserts, cermet inserts, carbide inserts and diamond inserts. 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 microelectronics, optical systems, household appliances and precision instrument parts.

[0003] Currently, existing high-precision CNC cutting tools typically use cemented carbide as the substrate material, and then prepare diamond films on the surface of the cemented carbide substrate material. However, cobalt in the cemented carbide substrate will promote graphitization, resulting in low diamond nucleation density and poor interfacial bonding between the diamond film and the substrate, thus affecting the service life of the CNC cutting tool.

[0004] Therefore, we propose a high-strength, wear-resistant CNC cutting tool for electronic components with strong interfacial bonding between the thin film and the substrate, and its preparation process, in order to extend the service life of the CNC cutting tool. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a high-strength wear-resistant CNC cutting tool for electronic components and its manufacturing process.

[0006] A high-strength, wear-resistant CNC cutting tool for cutting electronic components comprises a substrate cutting tool and a diamond film, wherein the substrate cutting tool includes the following components: 80-90 parts boron nitride micro powder, 10-15 parts alumina, 3-5 parts zinc oxide, 6-8 parts paraffin wax, 2-3 parts microcrystalline wax, 1-3 parts carnauba wax, 3-5 parts polypropylene and ethylene-vinyl acetate copolymer, and 1-2 parts stearic acid.

[0007] Furthermore, a manufacturing process for a high-strength, wear-resistant CNC cutting tool for electronic components includes the following steps: S1: Add alumina and zinc oxide and mix homogenously. Alumina and zinc oxide were ball-milled and mixed, and then homogenized together with boron nitride micro powder to obtain a mixed powder. S2: Add other components and mix thoroughly. The above-mentioned mixed powder is mixed evenly with paraffin wax, microcrystalline wax, carnauba wax, polypropylene and ethylene-vinyl acetate copolymer and stearic acid to obtain a mixture. S3: Cold pressing and sintering The above mixture is cold-pressed into a green blade, and then the green blade is sintered under high temperature and high pressure to obtain a base blade. S4: Surface Pretreatment The substrate cutting tool was polished with a polishing machine. Then, the polished substrate cutting tool was ultrasonically cleaned 2-3 times with acetone, alcohol and deionized water respectively. The cleaned substrate cutting tool was then placed in a diamond suspension and ultrasonically vibrated for 30-40 minutes. Then, it was ultrasonically cleaned in an alcohol solution for 6-8 minutes. Finally, it was placed in an oven and dried with high-pressure nitrogen to obtain the pretreated substrate cutting tool. S5: Microwave plasma chemical vapor deposition of diamond thin films The pretreated substrate cutting tool was placed in a microwave plasma chemical vapor deposition apparatus to prepare a uniform diamond film on the surface of the pretreated substrate cutting tool, thereby obtaining a high-strength and wear-resistant CNC cutting tool.

[0008] Further, step S1, which involves adding alumina and zinc oxide and homogenizing them, specifically includes the following steps: S1.1: Add alumina and zinc oxide together into a ball mill and ball mill for 1-2 hours 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 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 feeding component of the homogenizer to open, and adds boron nitride micro powder into the homogenizer through the feeding component; S1.4: The first gravity sensor sends a signal to the controller again when it detects that the gravity inside the homogenizer is no longer increasing. S1.5: After receiving the signal from the first gravity sensor again, the controller starts the homogenizer and homogenizes for 40-50 minutes to obtain mixed powder.

[0009] Furthermore, step S2, which involves adding other components and mixing them evenly, specifically includes the following steps: S2.1: The controller controls the opening of the discharge component of the homogenizer, and the mixed powder obtained in step S1.5 is poured into the twin-screw mixer through the discharge component; S2.2: The second gravity sensor in the double helix mixer sends a signal to the controller when it detects that the gravity inside the double helix mixer is no longer increasing; 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 and ethylene-vinyl acetate copolymer and stearic acid into the twin-screw mixer; S2.4: The second gravity sensor sends a signal to the controller again when it detects that the gravity inside the double helix mixer is no longer increasing. 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, and then mix at a rate of 15-25 r / min for 30-35 min to obtain a mixed material.

[0010] Furthermore, the cold pressing and sintering in step S3 specifically includes the following steps: S3.1: Add the mixture obtained in step S2.5 into the molding die, adjust the pressure of the cold pressing machine to 4-5 MPa, and then put the molding die into the cold pressing machine for cold pressing to obtain the green blade. S3.2: Place the above-mentioned green blank 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℃. Perform high-temperature and high-pressure sintering for 20-30 minutes to obtain the base blade.

[0011] Furthermore, step S5, microwave plasma chemical vapor deposition of diamond thin film, specifically includes the following steps: S5.1: Place the pretreated substrate blade obtained in step S4 on the stage in the microwave plasma chemical vapor deposition apparatus and adjust the microwave power to 8-10kW. S5.2: Introduce reaction gas from the top of the reaction chamber until the gas pressure inside the chamber is 6-8 kPa, then start the microwave generator; S5.3: The microwaves generated by the microwave generator are transmitted to the reaction chamber through the waveguide, and react with the reaction gas in the reaction chamber to produce plasma spheres. A uniform diamond film is prepared on the pre-treated substrate blade through the plasma spheres. S5.4: After deposition for 2-3 hours, flip the substrate cutting tool with the diamond film deposited on the upper surface and repeat the above operation to prepare a uniform diamond film on the lower surface of the substrate cutting tool with the diamond film deposited on the upper surface, thereby obtaining a high-strength and wear-resistant CNC cutting tool.

[0012] Furthermore, during the microwave-reactant gas reaction in step S5.3, if the piston in the reaction chamber moves outward, the first pressure sensor on the inside of the piston sends a signal to the controller. After receiving the signal from the first pressure sensor, the controller controls the vacuum pump at the bottom of the reaction chamber to start, evacuating and depressurizing the inside of the reaction chamber until the piston returns to its initial position. If the piston moves inward, the second pressure sensor on the outside of the piston sends a signal to the controller. After receiving the signal from the second pressure sensor, the controller controls the gas pump at the top of the reaction chamber to introduce the reactant gas into the reaction chamber until the piston returns to its initial position.

[0013] Furthermore, the reactant gas is a mixture of hydrogen and methane, wherein 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. This invention uses boron nitride micro powder as the main raw material, combined with alumina, zinc oxide, paraffin wax and microcrystalline wax, etc., to form a substrate cutting tool through cold pressing and sintering. Then, a diamond film is deposited on the surface of the substrate cutting tool to make a CNC cutting tool. It not only has strong wear resistance, but also has a strong interfacial bonding force between the diamond film and the substrate cutting tool, and is not easy to fall off. It is suitable for cutting materials with high precision requirements such as electronic components.

[0015] 2. The present invention uses a double-spiral mixer to uniformly mix powder with paraffin wax, microcrystalline wax and carnauba wax, which can improve the uniformity of the density distribution of the mixture and make the density distribution of the matrix blade obtained by pressing and sintering uniform, thereby improving the dimensional accuracy of the CNC blade.

[0016] 3. The present invention uses microcrystalline wax, carnauba wax and paraffin wax in combination to reduce the shrinkage of paraffin wax during solidification, 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 guaranteed.

[0017] 4. This invention cleans the surface of the substrate cutting tool with acetone and alcohol, and then places it in a diamond suspension for ultrasonic vibration, which can improve the nucleation density on the surface of the substrate cutting tool. Then, by microwave plasma chemical vapor deposition of diamond film, the interfacial bonding force between the diamond film and the surface of the substrate cutting tool can be further improved, thereby extending the service life of the CNC cutting tool. Attached Figure Description

[0018] Figure 1 This is a flowchart illustrating the manufacturing process of the high-strength, wear-resistant CNC cutting blade for electronic components used in the embodiments of the present invention.

[0019] Figure 2This is a summary table of the performance test results for Embodiments 1, 2, and 3 of the present invention.

[0020] Figure 3 This is a summary table of the performance test results of Embodiment 1 and Comparative Example 1 of the present invention.

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

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

[0023] Figure 6 This is a summary table of the performance test results of Embodiment 1 and Comparative Example 4 of the present invention. Detailed Implementation

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

[0025] Example 1: A manufacturing process for a high-strength, wear-resistant CNC cutting tool for electronic components, such as... Figure 1 and Figure 2 As shown, it includes the following steps: S1: Add alumina and zinc oxide and mix homogenously. Ten parts of alumina and three parts of zinc oxide were added to a ball mill and milled for 1 hour to obtain mixed metal oxide powder. Then, the discharge valve of the ball mill was opened, and the mixed metal oxide powder was added to a homogenizer. When the first gravity sensor in the homogenizer detected that the gravity inside the homogenizer began to increase, the first gravity sensor sent a signal to the controller. After receiving the signal from the first gravity sensor, the controller controlled the feeding component of the homogenizer to open, and 80 parts of boron nitride micro powder were added to the homogenizer through the feeding component. When the first gravity sensor detected that the gravity inside the homogenizer no longer increased, the first gravity sensor sent a signal to the controller again. After receiving the signal from the first gravity sensor again, the controller controlled the homogenizer to start. After homogenizing for 40 minutes, the mixed powder was obtained. S2: Add other components and mix thoroughly. The controller activates the discharge assembly of the homogenizer, which then pours the mixed powder into the twin-helix mixer. The mixture continues until the second gravity sensor in the twin-helix mixer detects that the gravity inside the mixer is no longer increasing. At this point, the second gravity sensor sends a signal to the controller. Upon receiving this signal, the controller controls the feeder to add 6 parts paraffin wax, 2 parts microcrystalline wax, 1 part carnauba wax, 3 parts polypropylene and ethylene-vinyl acetate copolymer, and 1 part stearic acid to the twin-helix mixer. This process continues until the second gravity sensor again detects that the gravity inside the twin-helix mixer is no longer increasing. At this point, the second gravity sensor sends another signal to the controller. Upon receiving this signal again, the controller controls the twin-helix mixer to mix at a rate of 5 r / min for 10 minutes, and then at a rate of 15 r / min for 30 minutes, to obtain the mixed material. S3: Cold pressing and sintering The above mixture is added to the molding die, the pressure of the cold press is adjusted to 4MPa, the molding die is then placed in the cold press for cold pressing to obtain a green blade, the green blade is then placed in a pyrophyllite mold and placed in the top hammer assembly cavity of a six-sided top press, the pressure of the six-sided top press is adjusted to 6GPa, the temperature is 1300℃, and high-temperature and high-pressure sintering is carried out for 20 minutes to obtain the base blade. S4: Surface Pretreatment The above-mentioned substrate cutting tool was polished with a polishing machine. Then, the polished substrate cutting tool was ultrasonically cleaned twice with acetone, alcohol and deionized water respectively. The cleaned substrate cutting tool was then placed in a diamond suspension and ultrasonically vibrated for 30 minutes. Then, it was ultrasonically cleaned in an alcohol solution for 6 minutes. Finally, it was placed in an oven and dried with high-pressure nitrogen to obtain the pretreated substrate cutting tool. S5: Microwave plasma chemical vapor deposition of diamond thin films The pretreated substrate blade is placed on the stage within a microwave plasma chemical vapor deposition apparatus, and the microwave power is adjusted to 8 kW. A reaction gas mixture of hydrogen and 6% methane (by volume) is then introduced from the top of the reaction chamber until the chamber pressure reaches 6 kPa. The microwave generator is then activated, and the generated microwaves are transmitted through a waveguide into the reaction chamber, where they react with the reaction gas to produce plasma spheres. These plasma spheres are used to prepare a uniform diamond film above the pretreated substrate blade. 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 from the first pressure sensor, the vacuum pump at the bottom of the reaction chamber is started to evacuate and depressurize the inside of the reaction chamber until the piston returns to its initial position. If the piston moves inward, the second pressure sensor on the outside of the piston sends a signal to the controller. After receiving the signal from the second pressure sensor, the controller controls the air pump at the top of the reaction chamber to introduce the reaction gas into the reaction chamber until the piston returns to its initial position. After deposition for 2 hours, the substrate cutting tool with the diamond film deposited on the upper surface is flipped over, and the above operation is repeated to prepare a uniform diamond film on the lower surface of the substrate cutting tool with the diamond film deposited on the upper surface, thus obtaining a high-strength and wear-resistant CNC cutting tool.

[0026] Then, various performance tests were conducted on the obtained high-strength and wear-resistant CNC cutting tools: First, the CNC insert is fixed with a standard tool holder clamp. The tool holder is placed horizontally on a marble platform. The tip height of the CNC insert is measured with a digital dial indicator. Then, the insert height range is calculated to be approximately 0.0042 mm. Secondly, the fiberglass was continuously cut with the prepared CNC insert for 2 hours. The wear height of the back face of the CNC insert after machining was measured by a digital micrometer and found to be approximately 0.012 mm, 0.009 mm and 0.015 mm respectively, with an average wear height of approximately 0.012 mm. At the same time, after 2 hours of cutting, the diamond film was observed not to peel off.

[0027] Example 2: A manufacturing process for a high-strength, wear-resistant CNC cutting tool for electronic components, such as... Figure 1 and Figure 2 As shown, it includes the following steps: S1: Add alumina and zinc oxide and mix homogenously. 12 parts alumina and 4 parts zinc oxide were added to a ball mill and milled for 1.5 hours to obtain mixed metal oxide powder. Then, the discharge valve of the ball mill was opened, and the mixed metal oxide powder was added to a homogenizer. When the first gravity sensor in the homogenizer detected that the gravity inside the homogenizer began to increase, the first gravity sensor sent a signal to the controller. After receiving the signal from the first gravity sensor, the controller controlled the feeding component of the homogenizer to open, and 85 parts boron nitride micro powder were added to the homogenizer through the feeding component. When the first gravity sensor detected that the gravity inside the homogenizer no longer increased, the first gravity sensor sent a signal to the controller again. After receiving the signal from the first gravity sensor again, the controller controlled the homogenizer to start. After homogenization for 45 minutes, the mixed powder was obtained. S2: Add other components and mix thoroughly. The controller activates the discharge assembly of the homogenizer, which then pours the mixed powder into the twin-helix mixer. The mixture continues until the second gravity sensor in the twin-helix mixer detects that the gravity inside the mixer is no longer increasing. At this point, the second gravity sensor sends a signal to the controller. Upon receiving this signal, the controller controls the feeder to add 7 parts paraffin wax, 2 parts microcrystalline wax, 2 parts carnauba wax, 4 parts polypropylene and ethylene-vinyl acetate copolymer, and 1 part stearic acid to the twin-helix mixer. This process continues until the second gravity sensor again detects that the gravity inside the twin-helix mixer is no longer increasing. At this point, the second gravity sensor sends another signal to the controller. Upon receiving this signal again, the controller controls the twin-helix mixer to mix at a rate of 7 r / min for 15 minutes, and then at a rate of 20 r / min for 32 minutes, to obtain the mixed material. S3: Cold pressing and sintering The above mixture is added to the molding die, the pressure of the cold press is adjusted to 4.5 MPa, the molding die is then placed in the cold press for cold pressing to obtain a green blade, the green blade is then placed in a pyrophyllite mold and placed in the top hammer assembly cavity of a six-sided press, the pressure of the six-sided press is adjusted to 7 GPa, the temperature is 1400℃, and high-temperature and high-pressure sintering is carried out for 25 minutes to obtain the base blade; S4: Surface Pretreatment The above-mentioned substrate cutting tool was polished with a polishing machine. Then, the polished substrate cutting tool was ultrasonically cleaned twice with acetone, alcohol and deionized water respectively. The cleaned substrate cutting tool was then placed in a diamond suspension and ultrasonically vibrated for 35 minutes. Then, it was ultrasonically cleaned in an alcohol solution for 7 minutes. Finally, it was placed in an oven and dried with high-pressure nitrogen to obtain the pretreated substrate cutting tool. S5: Microwave plasma chemical vapor deposition of diamond thin films The pretreated substrate blade is placed on the stage within a microwave plasma chemical vapor deposition apparatus, and the microwave power is adjusted to 9 kW. A reaction gas mixture of hydrogen and 7% methane (by volume) is then introduced from the top of the reaction chamber until the chamber pressure reaches 7 kPa. The microwave generator is then activated, and the generated microwaves are transmitted through a waveguide into the reaction chamber, where they react with the reaction gas to produce plasma spheres. These plasma spheres are used to prepare a uniform diamond film above the pretreated substrate blade. 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, which then... After receiving the signal from the first pressure sensor, the vacuum pump at the bottom of the reaction chamber is started to evacuate and depressurize the inside of the reaction chamber until the piston returns to its initial position. If the piston moves inward, the second pressure sensor on the outside of the piston sends a signal to the controller. After receiving the signal from the second pressure sensor, the controller controls the air pump at the top of the reaction chamber to introduce the reaction gas into the reaction chamber until the piston returns to its initial position. After deposition for 2.5 hours, the substrate cutting tool with the diamond film deposited on the upper surface is flipped over, and the above operation is repeated to prepare a uniform diamond film on the lower surface of the substrate cutting tool with the diamond film deposited on the upper surface, thus obtaining a high-strength and wear-resistant CNC cutting tool.

[0028] Then, various performance tests were conducted on the obtained high-strength and wear-resistant CNC cutting tools: First, the CNC insert is fixed with a standard tool holder clamp. The tool holder is placed horizontally on a marble platform. The tip height of the CNC insert is measured using a digital dial indicator. Then, the insert height range is calculated to be approximately 0.0035 mm. Secondly, the fiberglass was continuously cut with the prepared CNC insert for 2 hours. The wear height of the back face of the CNC insert after machining was measured by a digital micrometer and found to be approximately 0.008 mm, 0.011 mm and 0.009 mm respectively, with an average wear height of approximately 0.009 mm. At the same time, after 2 hours of cutting, the diamond film was observed not to peel off.

[0029] Example 3: A manufacturing process for a high-strength, wear-resistant CNC cutting tool for electronic components, such as... Figure 1 and Figure 2 As shown, it includes the following steps: S1: Add alumina and zinc oxide and mix homogenously. 15 parts alumina and 5 parts zinc oxide were added to a ball mill and milled for 2 hours to obtain mixed metal oxide powder. Then, the discharge valve of the ball mill was opened, and the mixed metal oxide powder was added to a homogenizer. When the first gravity sensor in the homogenizer detected that the gravity inside the homogenizer began to increase, the first gravity sensor sent a signal to the controller. After receiving the signal from the first gravity sensor, the controller controlled the feeding component of the homogenizer to open, and 90 parts boron nitride micro powder were added to the homogenizer through the feeding component. When the first gravity sensor detected that the gravity inside the homogenizer no longer increased, the first gravity sensor sent a signal to the controller again. After receiving the signal from the first gravity sensor again, the controller controlled the homogenizer to start. After homogenizing for 50 minutes, the mixed powder was obtained. S2: Add other components and mix thoroughly. The controller activates the discharge assembly of the homogenizer, which then pours the mixed powder into the twin-helix mixer. The mixture continues until the second gravity sensor in the twin-helix mixer detects that the gravity inside the mixer is no longer increasing. At this point, the second gravity sensor sends a signal to the controller. Upon receiving this signal, the controller controls the feeder to add 8 parts paraffin wax, 3 parts microcrystalline wax, 3 parts carnauba wax, 5 parts polypropylene and ethylene-vinyl acetate copolymer, and 1-2 parts stearic acid to the twin-helix mixer. This process continues until the second gravity sensor again detects that the gravity inside the twin-helix mixer is no longer increasing. At this point, the second gravity sensor sends another signal to the controller. Upon receiving this signal again, the controller controls the twin-helix 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 the mixed material. S3: Cold pressing and sintering The above mixture is added to the molding die, the pressure of the cold press is adjusted to 5MPa, the molding die is then placed in the cold press for cold pressing to obtain a green blade, the green blade is then placed in a pyrophyllite mold and placed in the top hammer assembly cavity of a six-sided top press, the pressure of the six-sided top press is adjusted to 8GPa, the temperature is 1500℃, and high-temperature and high-pressure sintering is carried out for 30 minutes to obtain the base blade. S4: Surface Pretreatment The above-mentioned substrate cutting tool was polished with a polishing machine. Then, the polished substrate cutting tool was ultrasonically cleaned three times with acetone, alcohol and deionized water respectively. The cleaned substrate cutting tool was then placed in a diamond suspension and ultrasonically vibrated for 40 minutes. Then, it was ultrasonically cleaned in an alcohol solution for 8 minutes. Finally, it was placed in an oven and dried with high-pressure nitrogen to obtain the pretreated substrate cutting tool. S5: Microwave plasma chemical vapor deposition of diamond thin films The pretreated substrate blade is placed on the stage within a microwave plasma chemical vapor deposition apparatus, and the microwave power is adjusted to 10kW. A reaction gas mixture of hydrogen and 8% methane (by volume) is then introduced from the top of the reaction chamber until the chamber pressure reaches 8 kPa. The microwave generator is then activated, and the generated microwaves are transmitted through a waveguide into the reaction chamber, where they react with the reaction gas to produce plasma spheres. These plasma spheres are used to prepare a uniform diamond film above the pretreated substrate blade. 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, controlling the... After receiving the signal from the first pressure sensor, the device controls the vacuum pump at the bottom of the reaction chamber to start, evacuating and depressurizing the inside of the reaction chamber until the piston returns to its initial position. If the piston moves inward, the second pressure sensor on the outside of the piston sends a signal to the controller. After receiving the signal from the second pressure sensor, the controller controls the air pump at the top of the reaction chamber to introduce the reaction gas into the reaction chamber until the piston returns to its initial position. After 3 hours of deposition, the substrate cutting tool with the diamond film deposited on the upper surface is flipped over, and the above operation is repeated to prepare a uniform diamond film on the lower surface of the substrate cutting tool with the diamond film deposited on the upper surface, thus obtaining a high-strength and wear-resistant CNC cutting tool.

[0030] Then, various performance tests were conducted on the obtained high-strength and wear-resistant CNC cutting tools: First, the CNC insert is fixed with a standard tool holder clamp. The tool holder is placed horizontally on a marble platform. The tip height of the CNC insert is measured using a digital dial indicator. Then, the insert height range is calculated to be approximately 0.0033 mm. Secondly, the fiberglass was continuously cut with the prepared CNC insert for 2 hours. The wear height of the back face of the CNC insert after machining was measured by a digital micrometer and found to be approximately 0.013 mm, 0.005 mm and 0.007 mm, respectively, with an average wear height of approximately 0.008 mm. At the same time, after 2 hours of cutting, the diamond film was observed not to peel off.

[0031] Comparative Example 1: A preparation process for a high-strength wear-resistant CNC cutting tool for electronic components. The preparation steps of Example 1 are the same as those in Example 1, except that steps S1, S2 and S3 are removed, and the base tool in step S4 is replaced with a carbide tool containing Co.

[0032] Then, various performance tests were conducted on the obtained high-strength and wear-resistant CNC cutting tools: First, the CNC insert is fixed with a standard tool holder clamp. The tool holder is placed horizontally on a marble platform. The tip height of the CNC insert is measured using a digital dial indicator. Then, the insert height range is calculated to be approximately 0.0112 mm. Secondly, the fiberglass was continuously cut with the prepared CNC insert for 2 hours. The wear height of the back face of the CNC insert after machining was measured by a digital micrometer and found to be approximately 0.018 mm, 0.012 mm and 0.021 mm, respectively, with an average wear height of approximately 0.017 mm. At the same time, after 2 hours of cutting, the diamond film was observed to peel off.

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

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

[0035] Then, various performance tests were conducted on the obtained high-strength and wear-resistant CNC cutting tools: First, the CNC insert is fixed with a standard tool holder clamp. The tool holder is placed horizontally on a marble platform. The tip height of the CNC insert is measured with a digital dial indicator. Then, the insert height range is calculated to be approximately 0.0039 mm. Secondly, the fiberglass was continuously cut with the prepared CNC insert for 2 hours. The wear height of the back face of the CNC insert after machining was measured by a digital micrometer and found to be approximately 0.014 mm, 0.011 mm and 0.008 mm, respectively, with an average wear height of approximately 0.011 mm. At the same time, after 2 hours of cutting, the diamond film was observed to peel off.

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

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

[0038] Then, various performance tests were conducted on the obtained high-strength and wear-resistant CNC cutting tools: First, the CNC insert is fixed with a standard tool holder clamp. The tool holder is placed horizontally on a marble platform. The tip height of the CNC insert is measured with a digital dial indicator. Then, the insert height range is calculated to be approximately 0.8633 mm. Secondly, the fiberglass was continuously cut with the prepared CNC insert for 2 hours. The wear height of the back face of the CNC insert after machining was measured by a digital micrometer and found to be approximately 0.017 mm, 0.013 mm and 0.019 mm, respectively, with an average wear height of approximately 0.016 mm. At the same time, after 2 hours of cutting, the diamond film was not observed to peel off.

[0039] like Figure 5 As shown, the performance test results of the comparative example 1 show that the use of microcrystalline wax, carnauba wax and paraffin wax can reduce the shrinkage of paraffin wax during solidification, 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 guaranteed.

[0040] Comparative Example 4: A preparation process for a high-strength wear-resistant CNC cutting blade for electronic components, referring to the preparation steps of Example 1, with other conditions unchanged, except that the double helix mixer in step S2 is replaced with an ordinary mixer.

[0041] Then, various performance tests were conducted on the obtained high-strength and wear-resistant CNC cutting tools: First, the CNC insert is fixed with a standard tool holder clamp. The tool holder is placed horizontally on a marble platform. The tip height of the CNC insert is measured with a digital dial indicator. Then, the insert height range is calculated to be approximately 0.7964 mm. Secondly, the fiberglass was continuously cut with the prepared CNC insert for 2 hours. The wear height of the back face of the CNC insert after machining was measured by a digital micrometer and found to be approximately 0.016 mm, 0.007 mm and 0.009 mm, respectively, with an average wear height of approximately 0.011 mm. At the same time, after 2 hours of cutting, the diamond film was not observed to peel off.

[0042] like Figure 6 As shown, by comparing the performance test results of Example 1 above, it can be seen that uniformly mixing the mixed powder with paraffin wax, microcrystalline wax and carnauba wax by a double helix mixer can improve the uniformity of the density distribution of the mixed materials, so as to make the density distribution of the matrix blade obtained by pressing and sintering uniform, thereby improving the dimensional accuracy of the CNC blade.

[0043] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A high-strength, wear-resistant CNC cutting tool for cutting electronic components, characterized in that, It consists of a substrate cutting tool and a diamond film, wherein the substrate cutting tool comprises the following components: 80-90 parts boron nitride micro powder, 10-15 parts alumina, 3-5 parts zinc oxide, 6-8 parts paraffin wax, 2-3 parts microcrystalline wax, 1-3 parts carnauba wax, 3-5 parts polypropylene and ethylene-vinyl acetate copolymer, and 1-2 parts stearic acid. The process for preparing the high-strength, wear-resistant CNC cutting tool for electronic components includes the following steps: S1: Add alumina and zinc oxide and mix homogenously. Alumina and zinc oxide were ball-milled and mixed, and then homogenized together with boron nitride micro powder to obtain a mixed powder. S2: Add other components and mix thoroughly. The above-mentioned mixed powder is mixed evenly with paraffin wax, microcrystalline wax, carnauba wax, polypropylene and ethylene-vinyl acetate copolymer and stearic acid to obtain a mixture. S3: Cold pressing and sintering The above mixture is cold-pressed into a green blade, and then the green blade is sintered under high temperature and high pressure to obtain a base blade. S4: Surface Pretreatment The substrate cutting tool was polished with a polishing machine. Then, the polished substrate cutting tool was ultrasonically cleaned 2-3 times with acetone, alcohol and deionized water respectively. The cleaned substrate cutting tool was then placed in a diamond suspension and ultrasonically vibrated for 30-40 minutes. Then, it was ultrasonically cleaned in an alcohol solution for 6-8 minutes. Finally, it was placed in an oven and dried with high-pressure nitrogen to obtain the pretreated substrate cutting tool. S5: Microwave plasma chemical vapor deposition of diamond thin films The above-mentioned pretreated substrate cutting tool is placed in a microwave plasma chemical vapor deposition apparatus to prepare a uniform diamond film on the surface of the pretreated substrate cutting tool, thereby obtaining a high-strength and wear-resistant CNC cutting tool. Step S2, which involves adding other components and mixing them evenly, specifically includes the following steps: S2.1: The controller controls the opening of the discharge component of the homogenizer, and the mixed powder obtained in step S1 is poured into the twin-screw mixer through the discharge component; S2.2: The second gravity sensor in the double helix mixer sends a signal to the controller when it detects that the gravity inside the double helix mixer is no longer increasing; 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 and ethylene-vinyl acetate copolymer and stearic acid into the twin-screw mixer; S2.4: The second gravity sensor sends a signal to the controller again when it detects that the gravity inside the double helix mixer is no longer increasing. 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, and then mix at a rate of 15-25 r / min for 30-35 min to obtain a mixed material.

2. The high-strength, wear-resistant CNC cutting blade for electronic components according to claim 1, characterized in that, Step S1, which involves adding alumina and zinc oxide and homogenizing them, specifically includes the following steps: S1.1: Add alumina and zinc oxide together into a ball mill and ball mill for 1-2 hours 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 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 feeding component of the homogenizer to open, and adds boron nitride micro powder into the homogenizer through the feeding component; S1.4: The first gravity sensor sends a signal to the controller again when it detects that the gravity inside the homogenizer is no longer increasing. S1.5: After receiving the signal from the first gravity sensor again, the controller starts the homogenizer and homogenizes for 40-50 minutes to obtain mixed powder.

3. The high-strength, wear-resistant CNC cutting blade for electronic components according to claim 2, characterized in that, Step S3, cold pressing and sintering, specifically includes the following steps: S3.1: Add the mixture obtained in step S2.5 into the molding die, adjust the pressure of the cold pressing machine to 4-5 MPa, and then put the molding die into the cold pressing machine for cold pressing to obtain the green blade. S3.2: Place the above-mentioned green blank 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℃. Perform high-temperature and high-pressure sintering for 20-30 minutes to obtain the base blade.

4. The high-strength, wear-resistant CNC cutting blade for electronic components according to claim 3, characterized in that, Step S5, microwave plasma chemical vapor deposition of diamond thin film, specifically includes the following steps: S5.1: Place the pretreated substrate blade obtained in step S4 on the stage in the microwave plasma chemical vapor deposition apparatus and adjust the microwave power to 8-10kW. S5.2: Introduce reaction gas from the top of the reaction chamber until the gas pressure inside the chamber is 6-8 kPa, then start the microwave generator; S5.3: The microwaves generated by the microwave generator are transmitted to the reaction chamber through the waveguide, and react with the reaction gas in the reaction chamber to produce plasma spheres. A uniform diamond film is prepared on the pre-treated substrate blade through the plasma spheres. S5.4: After deposition for 2-3 hours, flip the substrate cutting tool with the diamond film deposited on the upper surface and repeat the above operation to prepare a uniform diamond film on the lower surface of the substrate cutting tool with the diamond film deposited on the upper surface, thereby obtaining a high-strength and wear-resistant CNC cutting tool.

5. A high-strength, wear-resistant CNC cutting blade for electronic components according to claim 4, characterized in that, During the microwave-reacting reaction of the reaction gas in step S5.3, if the piston in the reaction chamber moves outward, the first pressure sensor on the inside of the piston sends a signal to the controller. After receiving the signal from the first pressure sensor, the controller controls the vacuum pump at the bottom of the reaction chamber to start, and evacuate and depressurize the inside of the reaction chamber until the piston returns to its initial position. If the piston moves inward, the second pressure sensor on the outside of the piston sends a signal to the controller. After receiving the signal from the second pressure sensor, the controller controls the gas pump at the top of the reaction chamber to introduce the reaction gas into the reaction chamber until the piston returns to its initial position.

6. A high-strength, wear-resistant CNC cutting blade for electronic components according to claim 5, characterized in that, The reactant gas is a mixture of hydrogen and methane, with the volume fraction of methane being 6-8%.

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