A composite coated diamond abrasive tool, its preparation method and application

Abstract

This invention provides a composite-coated diamond abrasive tool, its preparation method, and its application, relating to the field of cutting tool technology. The composite-coated diamond abrasive tool provided by this invention includes a tool substrate, a diamond abrasive layer disposed on the cutting surface of the tool substrate, and a composite coating disposed on the surface of the diamond abrasive layer. The composite coating includes a TiAlSiN coating, a TiN coating, a TiCN coating, or an AlTiCrN coating. The composite-coated diamond abrasive tool provided by this invention is suitable for machining fiber-reinforced composite materials and has a long service life.

Description

Technical Field

[0001] This invention relates to the field of cutting tool technology, and in particular to a composite coated diamond abrasive cutting tool, its preparation method, and its application. Background Technology

[0002] Fiber-reinforced composites (such as silicon carbide fiber-reinforced composites with silicon carbide matrix) have been widely used in aerospace, nuclear industry, and friction fields due to their excellent specific strength, specific stiffness, wear resistance, high temperature resistance, and thermal shock resistance. However, fiber-reinforced composites are difficult to process due to their anisotropy, inhomogeneity, and brittleness, and traditional processing techniques can easily lead to severe mechanical damage and tool wear.

[0003] Chinese patent CN105216021A discloses a diamond-coated tool for machining composite materials, and Chinese patent CN113664269A discloses a diamond-coated tool for high-efficiency machining of composite materials. However, when using the diamond-coated tools provided in the above patents to machine fiber-reinforced composite materials, the high-hardness material chips and uneven fibers can easily cause wear and shedding of diamond abrasive grains, affecting the tool's service life. Summary of the Invention

[0004] The purpose of this invention is to provide a composite coated diamond abrasive tool, its preparation method and application. The composite coated diamond abrasive tool provided by this invention is suitable for processing fiber-reinforced composite materials and has a long service life.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solution:

[0006] The present invention provides a composite coated diamond abrasive tool, comprising a tool substrate, a diamond abrasive layer disposed on the cutting surface of the tool substrate, and a composite coating disposed on the surface of the diamond abrasive layer, wherein the composite coating comprises a TiAlSiN coating, a TiN coating, a TiCN coating, or an AlTiCrN coating.

[0007] Preferably, the material of the tool substrate includes steel or cemented carbide.

[0008] Preferably, the diamond abrasive layer is formed of diamond abrasive grains, and the mesh size of the diamond abrasive grains is 30 to 1000 mesh.

[0009] Preferably, the thickness of the composite coating is 3–8 μm.

[0010] This invention provides a method for preparing the composite coated diamond abrasive tool described in the above technical solution, comprising the following steps:

[0011] Diamond abrasive grains are embedded on the cutting surface of the tool substrate to form a diamond abrasive grain layer, thus obtaining a diamond abrasive tool.

[0012] A composite coating is deposited on the surface of the diamond abrasive layer in the diamond abrasive tool to obtain the composite coated diamond abrasive tool.

[0013] Preferably, the method of embedding diamond abrasive grains on the cutting surface of the tool substrate includes brazing or electroplating.

[0014] The electroplating method includes: placing the cutting part of the tool substrate in a nickel plating electrolyte for pre-plating treatment to form a nickel layer, thereby obtaining a pre-plated tool substrate; then adding diamond abrasive grains to the nickel plating electrolyte for electroplating treatment, so that the diamond abrasive grains are embedded on the surface of the cutting part of the pre-plated tool substrate, thereby obtaining a diamond abrasive tool.

[0015] Preferably, the thickness of the nickel layer is 1–3 μm; the pre-plating conditions include: a temperature of 40–60°C and a current density of 1–3 A / dm². 2 The stirring rate is 100-200 r / min, and the electroplating time is 5-10 min;

[0016] The electroplating conditions include: a temperature of 40–60°C and a current density of 4–6 A / dm². 2 The stirring rate is 200–350 r / min, and the electroplating time is 20–40 min.

[0017] Preferably, the method for depositing a composite coating on the surface of the diamond abrasive layer in the diamond abrasive tool is physical vapor deposition.

[0018] Preferably, the physical vapor deposition (PVD) conditions include: the deposition is carried out in an argon and nitrogen atmosphere, with an argon flow rate of 40–80 sccm, a nitrogen flow rate of 90–130 sccm, and a vacuum degree of 0.6–1.0 Pa; the self-rotation speed of the diamond abrasive tool is 18–25 r / min, and the rotational speed is 15–25 r / min; the target material used includes a TiAlSi multi-arc target, a Ti target, a TiC target, or an AlNiCr target; the pulse bias voltage is -100–-200 V, and the current is 50–80 A; the deposition temperature is 200–250 °C, and the time is 60–150 min.

[0019] This invention provides the application of the composite coated diamond abrasive tool described in the above technical solution or the composite coated diamond abrasive tool prepared by the preparation method described in the above technical solution in processing fiber-reinforced composite materials.

[0020] The present invention provides a composite coated diamond abrasive tool, comprising a tool substrate, a diamond abrasive layer disposed on the cutting surface of the tool substrate, and a composite coating disposed on the surface of the diamond abrasive layer, wherein the composite coating comprises a TiAlSiN coating, a TiN coating, a TiCN coating, or an AlTiCrN coating. The composite-coated diamond abrasive tool provided by this invention has a composite coating on the surface of the diamond abrasive layer, which can improve the bonding force between the diamond abrasive and the tool substrate, making the bond between the diamond abrasive and the tool substrate more solid. It can also improve the toughness of the diamond abrasive, making it more wear-resistant. When machining hard and brittle materials such as fiber-reinforced composites, it is less likely to be broken along the cleavage plane by debris or exposed fibers under impact, which can effectively solve the problem of easy wear of diamond abrasive when machining fiber-reinforced composites. Moreover, the composite coating in this invention can protect the edge of the diamond abrasive used to cut the material to a certain extent, making it less prone to edge chipping. At the same time, the composite coating in this invention can also effectively protect the tool substrate, making it less likely to be damaged by fibers, matrix materials or debris in the composite material, reducing mechanical wear and thermal reaction during the machining process, thereby helping to extend the tool's service life. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the composite coated diamond abrasive tool of the present invention, wherein 1 is the functional layer of the composite coated diamond abrasive tool;

[0022] Figure 2 This is a partial enlarged view of a single diamond abrasive grain and its surface composite coating on a composite coated diamond abrasive tool of the present invention, wherein 11 is the composite coating, 12 is the diamond abrasive grain, and 13 is the tool substrate;

[0023] Figure 3 The image shows a Dino-Lite digital microscope image of the diamond abrasive tool prepared using the method of Example 1.

[0024] Figure 4 The image shows a Dino-Lite digital microscope image of the composite-coated diamond abrasive tool prepared using the method of Example 1.

[0025] Figure 5 The image shows a Dino-Lite digital microscope image after a wear test of the diamond abrasive tool prepared using the method in Example 1.

[0026] Figure 6 The image shows a Dino-Lite digital microscope image after a wear test of the composite-coated diamond abrasive tool prepared using the method in Example 1. Detailed Implementation

[0027] The present invention provides a composite coated diamond abrasive tool, comprising a tool substrate, a diamond abrasive layer disposed on the cutting surface of the tool substrate, and a composite coating disposed on the surface of the diamond abrasive layer, wherein the composite coating comprises a TiAlSiN coating, a TiN coating, a TiCN coating, or an AlTiCrN coating.

[0028] The composite coated diamond abrasive tool provided by this invention includes a tool substrate. In this invention, the material of the tool substrate preferably includes steel or cemented carbide, and the cemented carbide is preferably a tungsten-cobalt cemented carbide; the main components of the tungsten-cobalt cemented carbide are tungsten carbide (WC) and cobalt, and the grade designation is YG. The mass content of cobalt in the tungsten-cobalt cemented carbide can specifically be 6-8%.

[0029] The composite coated diamond abrasive tool provided by the present invention includes a diamond abrasive layer disposed on the cutting surface of the tool substrate. In the present invention, the diamond abrasive layer is preferably formed of diamond abrasive grains, and the mesh size of the diamond abrasive grains is preferably 30 to 1000 mesh, more preferably 40 to 500 mesh, further preferably 50 to 100 mesh, and even more preferably 60 to 70 mesh.

[0030] The composite-coated diamond abrasive tool provided by this invention includes a composite coating disposed on the surface of the diamond abrasive layer. The composite coating includes a TiAlSiN coating, a TiN coating, a TiCN coating, or an AlTiCrN coating, preferably a TiAlSiN coating. In this invention, the molar ratio of Ti, Al, Si, and N in the TiAlSiN coating is preferably 4–6:3–5:1–2:8–10, more preferably 5:4:1:9; the molar ratio of Ti to N in the TiN coating is preferably 3–6:1–3, more preferably 4:2; the molar ratio of Ti, C, and N in the TiCN coating is preferably 11–13:10–12:10–12, more preferably 12:11:11; the molar ratio of Al, Ti, Cr, and N in the AlTiCrN coating is preferably 1–3:1–3:2–6:5–8, more preferably 1:1:2:5. In this invention, the thickness of the composite coating is preferably 3–8 μm, more preferably 3–5 μm.

[0031] In this invention, depending on the preparation method of the composite-coated diamond abrasive tool, the composite-coated diamond abrasive tool preferably further includes a functional layer. For example, when diamond abrasive grains are embedded on the cutting surface of the tool substrate to form a diamond abrasive layer using electroplating, it is preferable to first pre-plat the cutting surface of the tool substrate to form a nickel layer. Based on this, a nickel layer is preferably disposed between the cutting surface of the tool substrate and the diamond abrasive layer in the resulting composite-coated diamond abrasive tool. The thickness of the nickel layer is preferably 1–3 μm. This invention, by setting a nickel layer, facilitates better embedding of the diamond abrasive grains into the tool substrate surface, resulting in a tighter bond between the two.

[0032] Figure 1 This is a schematic diagram of the composite coated diamond abrasive tool of the present invention, wherein 1 is the functional layer of the composite coated diamond abrasive tool, including a diamond abrasive layer formed by diamond abrasive grains and a composite coating disposed on the surface of the diamond abrasive layer. Figure 2 This is a partial enlarged view of a single diamond abrasive grain and its surface composite coating on a composite coated diamond abrasive tool of the present invention, wherein 11 is the composite coating, 12 is the diamond abrasive grain, and 13 is the tool substrate.

[0033] This invention provides a method for preparing the composite coated diamond abrasive tool described in the above technical solution, comprising the following steps:

[0034] Diamond abrasive grains are embedded on the cutting surface of the tool substrate to form a diamond abrasive grain layer, thus obtaining a diamond abrasive tool.

[0035] A composite coating is deposited on the surface of the diamond abrasive layer in the diamond abrasive tool to obtain the composite coated diamond abrasive tool.

[0036] This invention involves embedding diamond abrasive grains on the cutting surface of a tool substrate to form a diamond abrasive layer, thereby obtaining a diamond abrasive tool. In this invention, the tool substrate is preferably pretreated before use, and the pretreatment preferably includes sequential grinding and degreasing. This invention does not specifically limit the grinding method; any method well-known to those skilled in the art can be used, specifically ensuring that the surface of the tool substrate is free of obvious scratches and burrs. In this invention, the degreasing preferably includes: placing the ground tool substrate in an aqueous solution of industrial alkali (mainly sodium carbonate, purchased from Xin Nuotai Chemical, CAS number 497-19-8), and cleaning it after boiling; the concentration of the industrial alkali aqueous solution is preferably 30-40 wt%, more preferably 35 wt%; the boiling time is preferably 20-30 min, more preferably 25 min; the cleaning reagent is preferably water; the cleaning method is preferably ultrasonic cleaning; and the ultrasonic cleaning time is preferably 5-10 min, more preferably 8-10 min. In this invention, the diamond abrasive grains are preferably screened and degreased sequentially before use. The screening method is not particularly limited and any method known to those skilled in the art can be used, with the specific standard being to ensure that the required mesh size of the diamond abrasive grains is obtained. The method for degreasing the diamond abrasive grains is preferably the same as the method for degreasing the tool substrate, and will not be described in detail here.

[0037] In this invention, the method for embedding diamond abrasive grains on the cutting surface of the tool substrate preferably includes brazing or electroplating. This invention does not specifically limit the specific operating steps and parameters of the brazing method; any technical solution well-known to those skilled in the art can be used. In this invention, the electroplating method preferably includes: placing the cutting portion of the tool substrate in a nickel plating electrolyte for pre-plating to form a nickel layer, obtaining a pre-plated tool substrate; then adding diamond abrasive grains to the nickel plating electrolyte for electroplating, so that the diamond abrasive grains are embedded on the cutting surface of the pre-plated tool substrate, obtaining a diamond abrasive tool.

[0038] This invention involves pre-plating the cutting portion of a tool substrate in a nickel plating electrolyte to form a nickel layer, thereby obtaining a pre-plated tool substrate. In this invention, the nickel plating electrolyte is preferably a mixture of nickel sulfate, nickel chloride, nickel borate, and water; the concentration of nickel sulfate in the electrolyte is preferably 150–300 g / L, more preferably 240 g / L; the concentration of nickel chloride is preferably 10–30 g / L, more preferably 20 g / L; and the concentration of nickel borate is preferably 10–30 g / L, more preferably 20 g / L. In this invention, the pre-plating conditions include: a temperature preferably 40–60°C, more preferably 50°C; and a current density preferably 1–3 A / dm³. 2 More preferably 2-3 A / dm 2The stirring rate is preferably 100–300 r / min, more preferably 200 r / min; the electroplating time is preferably 5–10 min, more preferably 8–10 min. Preferably, the nickel plating electrolyte is heated to the temperature required for the pre-plating treatment, and then the cutting part of the tool substrate is immersed perpendicularly to the liquid surface of the nickel plating electrolyte, and the pre-plating treatment is performed while maintaining the temperature. In this invention, the thickness of the nickel layer formed on the surface of the tool substrate after the pre-plating treatment is preferably 1–3 μm.

[0039] After obtaining the pre-plated tool substrate, the present invention adds diamond abrasive grains to the nickel plating electrolyte and performs electroplating by passing an electric current, so that the diamond abrasive grains are embedded on the cutting surface of the pre-plated tool substrate, thereby obtaining a diamond abrasive tool. In the present invention, the preferred ratio of the nickel plating electrolyte to the diamond abrasive grains is 1L:60-100g, more preferably 1L:80g. In the present invention, the electroplating conditions include: the preferred current density is 4-6A / dm³. 2 More preferably 5A / dm 2 The stirring rate is preferably 200–350 r / min, more preferably 300 r / min; the electroplating treatment time is preferably 25–50 min, more preferably 30 min. In this invention, the electroplating treatment preferably includes sequential cleaning and drying; the cleaning reagent is preferably water; this invention does not have any special limitations on the drying, as long as sufficient drying is achieved.

[0040] After obtaining a diamond abrasive tool, the present invention deposits a composite coating on the surface of the diamond abrasive layer in the diamond abrasive tool to obtain the composite-coated diamond abrasive tool. In the present invention, the method for depositing the composite coating on the surface of the diamond abrasive layer in the diamond abrasive tool is preferably physical vapor deposition. In this invention, the physical vapor deposition (PVD) conditions include: the deposition is carried out in an atmosphere of argon and nitrogen, with the argon flow rate preferably 40–80 sccm, more preferably 60 sccm; the nitrogen flow rate preferably 90–130 sccm, more preferably 110 sccm; and the vacuum level preferably 0.6–1.0 Pa, more preferably 0.8 Pa. The rotational speed of the diamond abrasive tool is preferably 18–25 r / min, more preferably 20 r / min, and the revolution speed is preferably 15–25 r / min, more preferably 15–20 r / min. The target material used preferably includes a TiAlSi multi-arc target, a Ti target, a TiC target, or an AlNiCr target. The pulse bias voltage is preferably -100–-200 V, more preferably -150 V. The current is preferably 50–80 A, more preferably 65 A. The deposition temperature is preferably 200–250 °C, more preferably 200–220 °C, and the time is preferably 60–150 min, more preferably 100 min. In an embodiment of the present invention, the diamond abrasive tool is placed in a vacuum chamber and evacuated to a vacuum level of 8×10⁻⁶. -3 Pa, heat the cavity to 200-250℃, then evacuate to 8×10 -3 Pa, then argon and nitrogen are introduced to keep their flow rates within the above range and meet the above vacuum requirements. The rotation speed and revolution speed of the diamond abrasive tool are controlled within the above range. The target is turned on, and deposition is performed under the conditions that the pulse bias voltage and current meet the above requirements.

[0041] This invention provides the application of the composite-coated diamond abrasive tools described in the above-described technical solutions or the composite-coated diamond abrasive tools prepared by the preparation method described in the above-described technical solutions in the processing of fiber-reinforced composite materials. In this invention, the fiber-reinforced composite material preferably comprises a matrix material and fibers dispersed in the matrix material. The volume fraction of the fibers in the fiber-reinforced composite material is preferably 30-60%, more preferably 40-50%, and even more preferably 45%. The fibers are preferably carbon fibers or silicon carbide fibers. The matrix material preferably comprises a silicon carbide matrix material.

[0042] The technical solutions of this invention will be clearly and completely described below with reference to the embodiments thereof. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0043] Example 1

[0044] The surface of the tool substrate (specifically, a tungsten-cobalt cemented carbide, wherein the cobalt content in the tungsten-cobalt cemented carbide is 8%, i.e., YG8 cemented carbide) is ground to remove obvious scratches and burrs. Diamond abrasive grains (specifically 70 mesh) and the ground tool substrate are placed separately in a 35wt% industrial alkali aqueous solution (purchased from Xinnuotai Chemical, CAS No. KJDFD) and boiled for 25 minutes. After boiling, they are removed and ultrasonically cleaned in water for 10 minutes to obtain degreased diamond abrasive grains and a degreased tool substrate.

[0045] Nickel sulfate, nickel chloride, nickel borate, and water are mixed to obtain a nickel plating electrolyte. The concentrations of nickel sulfate, nickel chloride, and nickel borate in the nickel plating electrolyte are 240 g / L, 20 g / L, and 20 g / L, respectively. The nickel plating electrolyte is heated to 50°C, and then the cutting part of the degreasing tool substrate is immersed perpendicularly to the liquid surface of the nickel plating electrolyte, with the current density controlled at 3 A / dm³. 2 Under a stirring rate of 200 r / min, a pre-plating treatment was performed at a constant temperature for 10 min to deposit a nickel layer with a thickness of 1-3 μm on the surface of the degreased tool substrate, thus obtaining a pre-plated tool substrate. Then, degreased diamond abrasive grains with a concentration of 80 g / L were added to the nickel plating electrolyte; the current density was controlled at 5 A / dm³. 2 Under the condition of stirring rate of 300r / min, the electroplating treatment is carried out for 30min at a constant temperature, so that the diamond abrasive grains are embedded in the surface of the pre-plated tool substrate. Then, the workpiece is cleaned with water and dried to obtain the diamond abrasive tool.

[0046] The diamond abrasive tool was placed in a vacuum chamber and evacuated to a vacuum level of 8 × 10⁻⁶. -3 Pa, heat the cavity to 200℃, then evacuate to 8×10 -3 The vacuum level was 0.8 Pa, and then argon and high-purity nitrogen were introduced to achieve a vacuum of 0.8 Pa. The argon flow rate was 60 sccm and the nitrogen flow rate was 110 sccm. The self-rotation speed of the diamond abrasive tool was controlled at 20 r / min and the rotation speed at 15 r / min. The TiAlSi multi-arc target (where the molar ratio of Ti, Al and Si is 5:4:1) was turned on, and a deposition process was performed for 100 min under the conditions of pulse bias voltage of -150V and current of 65A to deposit a TiAlSiN coating with a thickness of 3 μm on the surface of the diamond abrasive tool, thus obtaining a composite coated diamond abrasive tool.

[0047] Figure 3 The image shows a Dino-Lite digital microscope image of the diamond abrasive tool prepared using the method of Example 1. Figure 4The image shows a Dino-Lite digital microscope image of a composite coated diamond abrasive tool prepared using the method of Example 1, which shows that a TiAlSiN coating is deposited on the surface of the diamond abrasive layer in the diamond abrasive tool.

[0048] Wear tests were conducted on another diamond abrasive tool and a composite-coated diamond abrasive tool from the same batch prepared using the method of Example 1. Specifically, the diamond abrasive tool and the composite-coated diamond abrasive tool were used to process SiC / SiC composite material (the SiC / SiC composite material includes SiC matrix material and SiC fibers dispersed in the SiC matrix material, and the volume fraction of SiC fibers in the SiC / SiC composite material is 45%). The rotation speed was 8000 rpm, the feed rate was 100 mm / min, the depth of cut was 0.1 mm, and the processing time was 2 h. The wear area of ​​the tool before and after processing was compared.

[0049] Figure 5 The image shows a Dino-Lite digital microscope image of the diamond abrasive tool prepared using the method of Example 1 after a wear test. The wear area is not marked on the left and is marked on the right. The results show that the wear area accounts for 25% of the diamond abrasive tool after the wear test. Figure 6 The images shown are Dino-Lite digital microscope images of the composite-coated diamond abrasive tool prepared using the method of Example 1 after wear testing. The wear area is not marked on the left, but is marked on the right. The results show that after the wear test, the wear area of ​​the composite-coated diamond abrasive tool accounts for only 3%. This indicates that although the composite-coated diamond abrasive tool in Example 1 of this invention exhibits damage to the tool substrate and wear on the diamond abrasive particles, the overall wear area is significantly lower than that of the diamond abrasive tool without a composite coating.

[0050] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A composite coated diamond abrasive tool, comprising a tool substrate, a diamond abrasive layer disposed on the cutting surface of the tool substrate, and a composite coating disposed on the surface of the diamond abrasive layer, wherein the composite coating comprises a TiAlSiN coating, a TiN coating, a TiCN coating, or an AlTiCrN coating. The method for preparing the composite coated diamond abrasive tool is carried out according to the following steps: The tool substrate is pretreated, and the cutting part of the pretreated tool substrate is placed in a nickel plating electrolyte for pre-plating to form a nickel layer, resulting in a pre-plated tool substrate with a nickel layer thickness of 1~3μm; the pre-plating conditions include: Temperature: 40~60℃, Current density: 1~3A / dm 2 The stirring rate is 100~200 r / min, and the electroplating time is 5~10 min; Then, diamond abrasive grains are added to the nickel plating electrolyte for electroplating treatment, so that the diamond abrasive grains are embedded on the cutting surface of the pre-plated tool substrate to obtain a diamond abrasive tool. The ratio of nickel plating electrolyte to diamond abrasive grains is 1L:60~100g; the electroplating conditions include: a temperature of 40~60℃ and a current density of 4~6A / dm³. 2 The stirring rate is 200~350 r / min, and the electroplating time is 20~40 min; A composite coating is deposited on the surface of the diamond abrasive layer in the diamond abrasive tool to obtain the composite-coated diamond abrasive tool. The method for depositing the composite coating on the surface of the diamond abrasive layer in the diamond abrasive tool is physical vapor deposition (PVD). The conditions for PVD include: being carried out in an argon and nitrogen atmosphere, with an argon flow rate of 40-80 sccm, a nitrogen flow rate of 90-130 sccm, and a vacuum degree of 0.6-1.0 Pa; the self-rotation speed of the diamond abrasive tool is 18-25 r / min, and the circumferential rotation speed is 15-25 r / min; the target material used includes TiAlSi multi-arc target, Ti target, TiC target, or AlNiCr target. The pulse bias voltage is -100~-200V, and the current is 50~80A; the deposition temperature is 200~250℃, and the time is 60~150min. The diamond abrasive layer is formed by diamond abrasive grains, and the mesh size of the diamond abrasive grains is 50~100 mesh; The thickness of the composite coating is 3~8μm.

2. The composite-coated diamond abrasive tool according to claim 1, characterized in that, The material of the tool substrate includes steel or cemented carbide.

3. The method for preparing the composite coated diamond abrasive tool according to any one of claims 1 to 2, comprising the following steps: The tool substrate is pretreated, and the cutting part of the pretreated tool substrate is placed in a nickel plating electrolyte for pre-plating to form a nickel layer, resulting in a pre-plated tool substrate with a nickel layer thickness of 1~3μm; the pre-plating conditions include: Temperature: 40~60℃, Current density: 1~3A / dm 2 The stirring rate is 100~200 r / min, and the electroplating time is 5~10 min; Then, diamond abrasive grains are added to the nickel plating electrolyte for electroplating treatment, so that the diamond abrasive grains are embedded on the cutting surface of the pre-plated tool substrate to obtain a diamond abrasive tool. The ratio of nickel plating electrolyte to diamond abrasive grains is 1L:60~100g; the electroplating conditions include: a temperature of 40~60℃ and a current density of 4~6A / dm³. 2 The stirring rate is 200~350 r / min, and the electroplating time is 20~40 min; A composite coating is deposited on the surface of the diamond abrasive layer in the diamond abrasive tool to obtain the composite-coated diamond abrasive tool. The method for depositing the composite coating on the surface of the diamond abrasive layer in the diamond abrasive tool is physical vapor deposition (PVD). The conditions for PVD include: PVD is performed in an argon and nitrogen atmosphere, with an argon flow rate of 40-80 sccm, a nitrogen flow rate of 90-130 sccm, and a vacuum degree of 0.6-1.0 Pa; the self-rotation speed of the diamond abrasive tool is 18-25 r / min, and the gyratory speed is 15-25 r / min; the target material used includes a TiAlSi multi-arc target, a Ti target, a TiC target, or an AlNiCr target; the pulse bias voltage is -100 to -200 V, and the current is 50-80 A; the deposition temperature is 200-250 °C, and the time is 60-150 min.

4. The application of the composite coated diamond abrasive tool according to any one of claims 1 to 2 or the composite coated diamond abrasive tool prepared by the preparation method according to claim 3 in the processing of fiber-reinforced composite materials.

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