Acoustic resonance grinding passivation numerical control tool and passivation method thereof

Abstract

According to the acoustic resonance grinding and passivating numerical control tool and the passivating method thereof, the acoustic resonance technology is adopted to enable the to-be-passivated tool and a grinding material to be uniformly ground at a high speed, sharp cutting edges of the to-be-passivated tools in different shapes are passivated into standard circular arcs, and the passivating radius is regulated and controlled through technological parameter changes. The acoustic resonance technology is applied to numerical control tool grinding passivation, strong energy is excited through resonance to drive a tool and a grinding material to vibrate at high frequency, the grinding frequency of the grinding material and the tool is increased, and the passivation efficiency is improved; sound waves generated by resonance form multiple force couples among the grinding materials and are gathered into a microscopic sound flow field, so that the flow of the whole field of the grinding materials is accelerated, the two sides of the cutting edge are uniformly ground, and the shape of the passivated cutting edge is standard.

Description

Technical Field

[0001] The invention relates to the technical field of tool processing, in particular to the passivation of a numerical control tool. Background Art

[0002] Before the CNC tools are finished, they need to be sharpened by a grinding wheel to improve cutting efficiency. At the same time, sharpening will produce microscopic gaps of varying degrees at the cutting edge. These gaps are very easy to expand in a high-speed cutting environment, accelerating the wear and even damage of the tool, resulting in problems such as short tool life and poor cutting stability. Therefore, the CNC tools must be passivated before coating, smoothing the grinding gaps and forming a rounded cutting edge to ensure the firmness of the coating and the service life of the tool. Commonly used edge passivation technologies include nylon brush passivation, sandblasting, stirring passivation, etc.

[0003] The announcement date is 2021-12-14, and the announcement number is CN113787191A. A CBN tool processing process with grooves is disclosed, which relates to the field of superhard material tool processing technology. The process includes the following steps: using a pressing die to press CBN powder into a blank with grooves; using tungsten-cobalt alloy to fill the grooves on the blank to obtain a filled blank; assembling the filled blank into a high-pressure synthetic block; synthesizing the high-pressure synthetic block under high temperature and high pressure to obtain a CBN tool semi-finished product; finally, taking out the CBN tool semi-finished product from the high-pressure synthetic block, and separating the CBN tool semi-finished product from the cemented carbide, and then trimming the CBN tool semi-finished product with a grinding tool, and then chamfering and passivating with a passivation brush to obtain a CBN tool finished product. This process is used to replace the existing laser engraving grooving method. A CBN tool with grooves can be directly obtained in the high-pressure synthesis stage, which greatly reduces the production cost of CBN tools with grooves, and is conducive to promoting the application of CBN tools with grooves. However, as the passivation time of the patent increases, the nylon brush will heat up and soften, and the grinding ability will decrease, resulting in poor consistency of the passivation effect.

[0004] The announcement date is 2021-02-19, and the announcement number is CN112372514A. A tool edge processing method is disclosed, which includes the following steps: a rough washing step: the tool is preliminarily cleaned to remove pollutants on the surface of the tool; a wet sandblasting passivation step: a nozzle is used to wet sandblast the surface of the tool, and the processing conditions of wet sandblasting are determined according to the type of tool and the material of the tool; the types of tools include milling cutters and finishing blades, and the materials of the tools include high-speed steel and cemented carbide; a fine washing step: after passivation, the tool is sequentially cleaned with alkaline solution, acid solution, and pure water, and finally cleaned with a rust inhibitor solution; a drying step: the tool is dried after fine washing. This method uses a wet sandblasting method to process milling cutters and finishing blades. Although the sandblasting method improves the consistency of the finished product compared to the nylon brush passivation method, the method of this patent can usually only process tool edges with regular shapes, and the processing effect on special-shaped edges or warped edges is poor, and sufficient time is required for drying after sandblasting, so the production efficiency is also low.

[0005] The stirring passivation method is to place the tool to be processed into the grinding medium, drive the tool to move in a fixed trajectory through the clamp, and achieve grinding with the help of the relative movement of the cutting edge and the abrasive. This method can be applied to tools with warped cutting edges, but the grinding amount on both sides of the cutting edge is usually inconsistent, so the passivation effect is not good; at the same time, the tool movement speed is slow, so the passivation efficiency is very low. Summary of the invention

[0006] In view of the above technical problems, the present invention proposes an acoustic resonance grinding passivation CNC tool and a passivation method thereof, which are used to solve the problems in the prior art that the cutting edge passivation technology is applicable to tools with a single shape, poor passivation effect, low efficiency and poor consistency.

[0007] In order to achieve the above object, the technical solution of the present invention is achieved as follows: An acoustic resonance grinding passivation CNC tool adopts acoustic resonance technology to make the tool to be passivated and the grinding material grind at high speed and uniformly, passivate the sharp cutting edge of the tool to be passivated of different shapes into a standard arc shape, and adjust the passivation radius by changing the process parameters. The present invention applies acoustic resonance technology to CNC tool grinding passivation, and stimulates strong energy through resonance to drive the tool and the grinding material to vibrate at high frequency, increase the grinding frequency of the grinding material and the tool, and improve the passivation efficiency; the resonance generates sound waves to form multiple force couples between the grinding materials, and gather into a microscopic acoustic flow field, accelerate the flow of the grinding material throughout the field, ensure uniform grinding on both sides of the cutting edge, and standardize the shape of the passivated cutting edge.

[0008] Further, the following steps are included: S1. Place the tool to be passivated in a passivation container, fill the container with abrasive material, and keep the abrasive material covering the tool to be passivated after compaction. The abrasive material occupies 80% to 90% of the volume of the passivation container. S2, adjusting the resonance frequency, keeping the filled passivation container and the acoustic resonance mixing device as the same resonance whole, setting the corresponding passivation parameters and performing the acoustic resonance passivation treatment; S3, taking out the tool that has been passivated in step S2 and cleaning the surface to complete the passivation of the tool edge.

[0009] Furthermore, in step S1, the horizontal movement and flipping motion of the tool to be passivated are constrained, the tool to be passivated are stacked in the passivation container, the tool to be passivated are separated by springs, and the stacking height of the tool to be passivated is 70% to 80% of the container height.

[0010] Furthermore, the passivation parameters described in step S2 include: resonance frequency 55-65 Hz, resonance intensity 70-90 g, and passivation time 5-30 min.

[0011] Furthermore, auxiliary circulating water is used during the passivation of the cutting tools to be passivated.

[0012] Furthermore, the passivation parameters also include the temperature of the auxiliary circulating water being 15-35°C.

[0013] Furthermore, the grinding material includes abrasive particles and auxiliary particles, the weight ratio of the abrasive particles is 70-90%, and the abrasive particles include powdered white corundum or silicon carbide or boron nitride or diamond.

[0014] Furthermore, the abrasive particles have a specification of W2.5~W40.

[0015] Furthermore, the auxiliary particles include sawdust or walnut shells; the auxiliary particles have a specification of 10-20 meshes.

[0016] Furthermore, the type of the tool to be passivated includes a milling cutter, a comb cutter, or a hob; the material of the tool to be passivated includes tungsten steel or high-speed steel; the shape of the cutting edge of the tool to be passivated includes straight, arc, round, or warped.

[0017] The passivation method for CNC tools by acoustic resonance grinding passivation as described in any of the above items.

[0018] Beneficial effects of the present invention: 1. The present invention applies acoustic resonance technology to CNC tool grinding and passivation. Through resonance, powerful energy is excited to drive the tool and the grinding material to vibrate at high frequency, thereby increasing the grinding frequency of the grinding material and the tool and improving the passivation efficiency. The resonance generates sound waves to form multiple force couples between the grinding materials and converge into a microscopic acoustic flow field, which accelerates the flow of the grinding material throughout the field, ensures uniform grinding on both sides of the cutting edge, and standardizes the shape of the passivated cutting edge. 2. The method of the present invention can be applied to tools of different shapes, materials and sizes. Under suitable grinding materials, only the passivation process parameters can be changed to achieve different passivation radius control; 3. The method of the present invention can stimulate powerful energy through system resonance to drive the tool and the grinding material to vibrate at high frequency, thereby increasing the grinding frequency of the grinding material and the tool, and can fully improve the passivation efficiency; 4. The method of the present invention uses the resonant sound waves generated by the acoustic resonance technology to transmit between the grinding materials to form multiple force couples, and gather into a microscopic acoustic flow field to accelerate the flow of the grinding materials throughout the field, ensuring that both sides of the cutting edge are evenly ground during the passivation process and the shape of the cutting edge passivation is standard; 5. The passivation process in the method of the present invention can be applied to cutting tools of different shapes, materials and sizes. Under suitable grinding materials, different passivation radius controls can be achieved by simply changing the passivation process parameters. The process is simple and the product consistency is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a schematic diagram of the passivation process of the present invention.

[0021] Figure 2 This is a diagram of tool detection results after passivation in Example 1 of the present invention.

[0022] Figure 3 This is a diagram of tool detection results after passivation in Example 2 of the present invention.

[0023] Figure 4 This is a diagram of tool detection results after passivation in Example 3 of the present invention.

[0024] Figure 5 This is a diagram of tool detection results after passivation in Example 4 of the present invention.

[0025] Figure 6 This is a diagram of tool detection results after passivation in Example 5 of the present invention.

[0026] Figure 7 This is a diagram of tool detection results after passivation in Example 6 of the present invention.

[0027] Figure 8 This is a diagram of tool detection results after passivation in a comparative example of the present invention.

[0028] In the figure: 1. Tool to be passivated, 2. Passivation container, 3. Abrasive material, 4. Spring, 5. Microscopic acoustic flow field. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] like Figure 1 As shown, the acoustic resonance grinding passivation CNC tool described in the present invention uses acoustic resonance technology to make the tool 1 to be passivated and the grinding material grind at high speed and evenly, passivate the sharp cutting edges of the tools 1 to be passivated of different shapes into a standard arc shape, and control the passivation radius by changing the process parameters.

[0031] Furthermore, the passivation method of the acoustic resonance grinding passivation CNC tool comprises the following steps: S1, placing the tool 1 to be passivated in the container of the acoustic resonance mixing device, i.e., the passivation container 2, filling the passivation container 2 with abrasive material 3, and keeping the abrasive material 3 covering the tool 1 to be passivated after compaction, with the abrasive material 3 occupying 80% to 90% of the volume of the passivation container 2; S2, adjusting the resonance frequency of the acoustic resonance mixing device so that the filled passivation container 2 and the acoustic resonance mixing device are maintained as the same resonant whole, and performing the acoustic resonance passivation treatment after setting the corresponding passivation parameters; and, during the passivation period, using auxiliary circulating water, the circulating water circulates through the outside of the passivation container 2, thereby achieving the effect of constant temperature in the container; S3, taking out the tool that has been passivated in step S2 and cleaning the surface to complete the passivation of the tool edge.

[0032] Through resonance, powerful energy is excited to drive the tool 1 to be passivated and the grinding material 3 to vibrate at high frequency, thereby increasing the grinding frequency of the grinding material 3 and the tool 1 to be passivated and improving the passivation efficiency; the resonance generates sound waves to form multiple force couples between the grinding materials and converge into a microscopic sound flow field 5, such as Figure 1 As shown, the flow of the abrasive material is accelerated to ensure uniform grinding on both sides of the cutting edge and standardize the shape of the blunt cutting edge.

[0033] Furthermore, in step S1, the horizontal movement and flipping movement of the tool 1 to be passivated are constrained, the tool 1 to be passivated is stacked in the passivation container 2, the tool 1 to be passivated is separated by a spring 4, and the stacking height of the tool 1 to be passivated is 70% to 80% of the container height.

[0034] Furthermore, the passivation parameters described in step S2 include: resonance frequency of 55-65 Hz, resonance intensity of 70-90 g, passivation time of 5-30 min, and temperature of auxiliary circulating water of 15-35° C.

[0035] Further, the grinding material 3 includes abrasive particles and auxiliary particles, the weight ratio of the abrasive particles is 70-90%, and the abrasive particles include powdered white corundum or silicon carbide or boron nitride or diamond. The abrasive particle specifications are W2.5-W40. The auxiliary particles include sawdust or walnut shells; the auxiliary particle specifications are 10-20 mesh.

[0036] The types of the tool 1 to be passivated include milling cutters, comb cutters, hobs, etc.; the material of the tool 1 to be passivated includes tungsten steel or high-speed steel; the shape of the cutting edge of the tool 1 to be passivated includes straight, arc, round, or warped.

[0037] Example 1 In this embodiment, the tool to be passivated is a triangular combing tool, the cutting edge of which is warped by about 40° and is made of tungsten steel.

[0038] Step 1: Place the tool to be passivated in a passivation container, add abrasive material into the container, and keep the abrasive material covering the passivated tool after compaction; The grinding material is a uniform mixture of SiC particles and walnut shells in a weight ratio of 9:1. The stacking height after the tool is restrained is 70% of the container height, and the grinding material occupies 85% of the container volume. The SiC particle specification is W25, and the walnut shell specification is 10 mesh. Step 2: Adjust the resonance frequency to keep the filled passivation container and the acoustic resonance mixing device as the same resonant whole, set the corresponding passivation parameters and perform the acoustic resonance passivation process; Among them, the resonance frequency is set to 60 Hz, and the passivation parameters are: resonance intensity 80 g, passivation time 20 min, and auxiliary circulating water temperature during passivation 25 °C; Step 3: Take out the tool that has been passivated in step 2 and clean the surface to complete the tool edge passivation.

[0039] Example 2 In this embodiment, the tool to be passivated is a triangular combing tool, the cutting edge of which is warped by about 40° and is made of tungsten steel.

[0040] Step 1: Place the tool 1 to be passivated in the passivation container 2, add the grinding material 3 into the container, and keep the grinding material covering the tool 1 after compaction; Among them, the grinding material 3 is a uniform mixture of SiC particles and walnut shells in a weight ratio of 9:1. After the passivated tool 1 is constrained, the stacking height is 70% of the container height, and the grinding material occupies 80% of the container volume; the SiC particle specification is W25, and the walnut shell specification is 10 mesh; Step 2: Adjust the resonance frequency to keep the filled passivation container 2 and the acoustic resonance mixing device as the same resonant whole, set the corresponding passivation parameters and perform the acoustic resonance passivation process; Among them, the resonance frequency is set to 60 Hz, and the passivation parameters are: resonance intensity 80 g, passivation time 30 min, and auxiliary circulating water temperature during passivation 25 °C; Step 3: Take out the tool that has been passivated in step 2 and clean the surface to complete the tool edge passivation.

[0041] Example 3 In this embodiment, the tool to be passivated is a square toothed tool with a cutting edge warping of about 10° and is made of tungsten steel.

[0042] Step 1: Place the tool 1 to be passivated in the passivation container 2, add the grinding material 3 into the passivation container 2, and keep the grinding material covering the passivated tool after compaction; The grinding material is a uniform mixture of SiC particles and walnut shells in a weight ratio of 8.5:1.5. After the passivated tool 1 is constrained, the stacking height is 75% of the container height, and the grinding material occupies 80% of the container volume; the SiC particle specification is W40, and the walnut shell specification is 20 mesh; Step 2: Adjust the resonance frequency to keep the filled passivation container and the acoustic resonance mixing device as the same resonant whole, set the corresponding passivation parameters and perform the acoustic resonance passivation process; Among them, the resonance frequency is set to 55 Hz, and the passivation parameters are: resonance intensity 90 g, passivation time 15 min, and auxiliary circulating water temperature during passivation 15 °C; Step 3: Take out the tool that has been passivated in step 2 and clean the surface to complete the tool edge passivation.

[0043] Example 4 In this embodiment, the tool 1 to be passivated is a square toothed tool with a cutting edge warping of about 10° and is made of tungsten steel.

[0044] Step 1: Place the tool 1 to be passivated in the passivation container 2, add the grinding material 3 into the container, and keep the grinding material covering the tool 1 after compaction; The grinding material is a uniform mixture of boron nitride particles and walnut shells in a weight ratio of 8.5:1.5. After the passivated tool 1 is constrained, the stacking height is 75% of the container height, and the grinding material occupies 90% of the container volume; the boron nitride particle specification is W40, and the walnut shell specification is 20 mesh; Step 2: Adjust the resonance frequency to keep the filled passivation container and the acoustic resonance mixing device as the same resonant whole, set the corresponding passivation parameters and perform the acoustic resonance passivation process; Among them, the resonance frequency is set to 55 Hz, and the passivation parameters are: resonance intensity 90 g, passivation time 30 min, and auxiliary circulating water temperature during passivation 15 °C; Step 3: Take out the tool that has been passivated in step 2 and clean the surface to complete the tool edge passivation.

[0045] Example 5 In this embodiment, the tool to be passivated is a circular milling cutter with a cutting edge warping of about 30° and made of high-speed steel.

[0046] Step 1: Place the tool to be passivated in a passivation container, add abrasive material into the container, and keep the abrasive material covering the passivated tool after compaction; The grinding material is a uniform mixture of white corundum particles and sawdust in a weight ratio of 9:1. After the passivated tool 1 is restrained, the stacking height is 75% of the container height, and the grinding material occupies 90% of the container volume; the specification of the white corundum particles is W2.5, and the specification of the sawdust is 20 mesh; Step 2: Adjust the resonance frequency to keep the filled passivation container and the acoustic resonance mixing device as the same resonant whole, set the corresponding passivation parameters and perform the acoustic resonance passivation process; Among them, the resonance frequency was set to 65 Hz, and the passivation parameters were: resonance intensity 70 g, passivation time 10 min, and auxiliary circulating water temperature during passivation 35 °C; Step 3: Take out the tool that has been passivated in step 2 and clean the surface to complete the tool edge passivation.

[0047] Example 6 In this embodiment, the tool to be passivated is a circular milling cutter with a cutting edge warping of about 30° and made of high-speed steel.

[0048] Step 1: Place the tool 1 to be passivated in a passivation container 2, add abrasive material 3 into the container, and keep the abrasive material covering the passivated tool after compaction; The grinding material is a uniform mixture of diamond powder and sawdust in a weight ratio of 8:2. After the passivated tool 1 is constrained, the stacking height is 75% of the container height, and the grinding material occupies 90% of the container volume; the diamond powder specification is W2.5, and the sawdust specification is 20 mesh; Step 2: Adjust the resonance frequency to keep the filled passivation container and the acoustic resonance mixing device as the same resonant whole, set the corresponding passivation parameters and perform the acoustic resonance passivation process; Among them, the resonance frequency is set to 65 Hz, and the passivation parameters are: resonance intensity 80 g, passivation time 5 min, and auxiliary circulating water temperature during passivation 35 °C; Step 3: Take out the tool that has been passivated in step 2 and clean the surface to complete the tool edge passivation.

[0049] Comparative Example In this embodiment, the tool to be passivated is a circular milling cutter with a cutting edge warping of about 30° and made of high-speed steel.

[0050] Step 1: Place the tool 1 to be passivated in a passivation container 2, add abrasive material 3 into the container, and keep the abrasive material covering the passivated tool after compaction; The grinding material is a uniform mixture of white corundum particles and sawdust in a weight ratio of 9:1. After the passivated tool 1 is restrained, the stacking height is 75% of the container height, and the grinding material occupies 90% of the container volume; the specification of the white corundum particles is W2.5, and the specification of the sawdust is 20 mesh; Step 2: Place the filled passivation container on a vibration table, which is driven by a motor with a rated power of 1kw. Set the corresponding passivation parameters and perform the passivation treatment for 10 minutes. Step 3: Take out the tool that has been passivated in step 2 and clean the surface to complete the tool edge passivation.

[0051] The cutting edges of the CNC tools after passivation treatment in Examples 1 to 6 and Comparative Example 1 were tested respectively. Figures 2 to 8 They are respectively the CNC tool edge morphology images after passivation treatment in Examples 1 to 6 and Comparative Examples and the corresponding passivation radius fitting results, where the horizontal and vertical coordinates are in millimeters (mm), the arc line represents the position coordinate change caused by the movement of the probe along the edge surface, and the arrow indicates the arc radius after fitting in the selected area. Figure 2 As shown in FIG. 1 , the test result of the CNC tool edge after passivation treatment in Example 1 is shown. The edge presents a standard arc shape, and the arc radius after fitting is 0.053 mm. Figure 3 As shown in FIG. 1 , the test result of the CNC tool edge after passivation treatment in Example 2 is shown. The cutting edge presents a standard arc shape, and the arc radius after fitting is 0.078 mm. Figure 4 As shown in FIG. 1 , the test result of the CNC tool edge after passivation treatment in Example 3 is shown. The edge presents a standard arc shape, and the arc radius after fitting is 0.023 mm. Figure 5 As shown in FIG. 1 , the test result of the CNC tool edge after passivation treatment in Example 4 is shown. The edge presents a standard arc shape, and the arc radius after fitting is 0.043 mm. Figure 6 As shown in FIG. 1 , the test result of the CNC tool edge after passivation treatment in Example 5 is shown. The edge presents a standard arc shape, and the arc radius after fitting is 0.021 mm. Figure 7 As shown in FIG. 1 , the test result of the CNC tool edge after passivation treatment in Example 6 is shown. The edge presents a standard arc shape, and the arc radius after fitting is 0.067 mm. Figure 8 As shown, it is the detection result diagram of the CNC tool edge after passivation treatment in Comparative Example 1. The shape of the cutting edge is a waterfall shape, not a standard arc, so the corresponding arc radius cannot be fitted.

[0052] The edge blunting radius is measured by a macro-profile measuring instrument, and the specific equipment model is HOMMEL-TAMICT8000.

[0053] During the measurement, the cutting edge placement angle is adjusted with the help of the measuring tool, the cutting edge to be measured faces upward, the profilometer probe contacts the tool surface, and moves along the normal direction of the cutting edge. The detection profile data is displayed as a curve in the computer software, and points are taken on both sides of the curve arc for arc fitting and radius measurement to obtain the passivation radius data. The test results are shown in Table 1.

[0054] Table 1 CNC tool edge detection results Cutting edge radius (μm) Edge shape Example 1 53 Standard arc Example 2 78 Standard arc Example 3 23 Standard arc Example 4 43 Standard arc Example 5 21 Standard arc Example 6 67 Standard arc Comparative Example / Waterfall It can be seen from the data in Table 1 that the edge shapes of the tools after passivation in Examples 1 to 6 are all standard arcs, and the edge passivation radius can be adjusted with the change of the passivation process. In the comparative example, the tool after passivation has inconsistent grinding amounts on both sides of the edge due to the upturned edge, forming a waterfall-shaped edge, and the vibration intensity is insufficient, the grinding amount is too small, and the edge radius is lower than the lower limit of instrument detection.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that any modification to the technical solutions described in the aforementioned embodiments, or any equivalent replacement of some or all of the technical features therein, within the spirit and principles of the present invention, and such modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. An acoustic resonance grinding passivation CNC tool, characterized in that: Acoustic resonance technology is used to uniformly grind the tool (1) to be passivated and the abrasive material at high speed, so that the sharp edges of the tools (1) to be passivated with different shapes are passivated into a standard arc shape, and the passivation radius is controlled by changing the process parameters.

2. The passivation method for a numerically controlled tool by acoustic resonance grinding passivation according to claim 1, characterized in that: The following steps are involved: S1, placing the tool to be passivated (1) in a passivation container (2), filling the passivation container (2) with abrasive material (3), and maintaining the abrasive material (3) to cover the tool to be passivated (1) after compaction, with the abrasive material (3) occupying 80% to 90% of the volume of the passivation container (2); S2, adjusting the resonance frequency, keeping the filled passivation container (2) and the acoustic resonance mixing device as the same resonance entity, setting corresponding passivation parameters and performing acoustic resonance passivation treatment; S3, taking out the tool that has been passivated in step S2 and cleaning the surface to complete the passivation of the tool edge.

3. The passivation method for a numerically controlled tool by acoustic resonance grinding passivation according to claim 2, characterized in that: In step S1, the horizontal movement and flipping movement of the tool (1) to be passivated are constrained. The tool (1) to be passivated is stacked in a passivation container (2). The tool (1) to be passivated is separated by a spring (4). The stacking height of the tool (1) to be passivated is 70% to 80% of the height of the container.

4. The passivation method for a numerically controlled tool by acoustic resonance grinding passivation according to claim 2 or 3, characterized in that: The passivation parameters described in step S2 include: resonance frequency 55-65 Hz, resonance intensity 70-90 g, and passivation time 5-30 min.

5. The passivation method for a numerically controlled tool by acoustic resonance grinding passivation according to claim 2 or 3, characterized in that: Auxiliary circulating water is used during the passivation of the tool to be passivated (1).

6. The passivation method for a numerically controlled tool by acoustic resonance grinding passivation according to claim 5, characterized in that: The passivation parameters also include the temperature of the auxiliary circulating water being 15-35°C.

7. The passivation method for a numerically controlled tool by acoustic resonance grinding passivation according to claim 2, 3 or 6, characterized in that: The grinding material (3) comprises abrasive particles and auxiliary particles, the weight ratio of the abrasive particles is 70-90%, and the abrasive particles comprise powdered white corundum or silicon carbide or boron nitride or diamond.

8. The passivation method for a numerically controlled tool by acoustic resonance grinding passivation according to claim 7, characterized in that: The abrasive particle specifications are W2.5~W40.

9. The passivation method for a numerically controlled tool by acoustic resonance grinding passivation according to claim 7, characterized in that: The auxiliary particles include wood chips or walnut shells; the auxiliary particles have a specification of 10-20 meshes.

10. The passivation method for a numerically controlled tool by acoustic resonance grinding passivation according to claim 2 or 3 or 6 or 8 or 9, characterized in that: The type of the tool to be passivated (1) includes a milling cutter, a comb cutter, or a hob; the material of the tool to be passivated (1) includes tungsten steel or high-speed steel; the shape of the cutting edge of the tool to be passivated (1) includes a straight shape, an arc shape, a round shape, or a warped shape.

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