A superhard tool testing method and tool testing material

Abstract

The present invention relates to the technical field of tool testing in superhard material processing, and more particularly to a superhard tool testing method and testing materials. The method comprises: step S1, preparing a first tool test piece with a cylindrical structure; step S2, splicing and fixing a second tool test piece to the inner wall of the first tool test piece, wherein a plurality of verification particles distributed in equal quantities and positions are embedded in the cavity of the second tool test piece; step S3, installing the tool test piece formed by combining the first and second tool test pieces on a lathe, and performing spiral turning on the first tool test piece using a superhard tool; step S4, comparing the dimensions of the contact portion of the superhard tool after the spiral turning with a standard superhard tool to evaluate the wear resistance of the superhard tool; and step S5, collecting the shedding state of the verification particles in the cavity of each second tool test piece to determine the cutting stability of the superhard tool when turning different parts of the first tool test piece. This achieves simultaneous quantitative analysis of tool wear resistance and stability.

Description

Technical Field

[0001] The invention relates to the technical field of tool testing in superhard material processing, in particular to a superhard tool testing method and tool testing materials. Background Art

[0002] Superhard material cutting tools, including diamond and cubic boron nitride, are difficult to sharpen due to their high hardness, requiring specialized edge processing. Furthermore, the blades require precision welding and sintering processes, and the interface strength directly impacts tool life. Therefore, effective tool testing is essential after machining.

[0003] For example, in the prior art, Chinese patent publication No. CN116678777A discloses a device and method for testing the wear resistance of tool coatings. The device includes a workbench, a pressure scale, a clamping component, a force transmission rod, and a grinding component. By recording the weight difference of the PVD tool before and after the wear test, the wear resistance that is traditionally difficult to quantify is concretized and presented in a numerical manner, which helps users quickly judge the ability of such coatings to resist wear during cutting processing. This solves the problem that existing friction and wear testing machines are expensive, have conventional testing methods, and are difficult to simulate the wear of PVD tools when cutting different materials, thereby failing to accurately test the wear resistance indicators of the PVD coating coated on the tool.

[0004] However, the above technology has the following technical problems: it is impossible to further refine the test of the specific wear status of each part of the tool by only the change in weight, resulting in a single test result and a lack of wide application. Summary of the Invention

[0005] To this end, the present invention provides a superhard tool testing method and tool testing material to solve the problem in the prior art that the specific wear status of each part of the tool cannot be further refined and tested only through weight changes, resulting in a single test result and lack of wide application.

[0006] To achieve the above object, the present invention provides a superhard cutting tool testing method, comprising step S1, preparing a first cutting tool test body with a cylindrical structure;

[0007] Step S2: a plurality of second blade members with cavities are radially spaced apart on the inner wall of the first blade member, wherein the spaced apart second blade members are spliced ​​together to cover the inner wall of the first blade member structure, and the sides of the second blade members facing away from the inner wall of the first blade member are spliced ​​together to form a cylindrical structure with a smaller inner diameter;

[0008] The cavity of the second knife specimen is embedded with a number of verification particles distributed in equal amounts and positions;

[0009] Step S3, installing the tool specimen formed by combining the first tool specimen and the second tool specimen on a lathe, and performing spiral turning on the first tool specimen using a superhard tool;

[0010] Step S4, comparing the dimensions of the contact portion of the superhard tool after the spiral turning and the standard superhard tool where the tools perform cutting to evaluate the wear resistance of the superhard tool;

[0011] Step S5: collecting the shedding state of the verification particles in the cavity of each second tool specimen to determine the cutting stability of the superhard tool when turning different parts of the first tool specimen.

[0012] As a preferred technical solution for the superhard tool testing method, step S1 includes:

[0013] Step S11, pouring the mixed particle size pyrophyllite powder into a rotary vibrating sieve for particle size screening, and extracting powders of different particle sizes according to a preset ratio;

[0014] Step S12: Pour the extracted powder into a bedroom mixer, add glass glue and purified water in a specified proportion, mix, and use a powder humidity detector to test the water content of the powder. If it is within the range of 1%-5%, it is determined to be qualified and proceed to the next step;

[0015] Step S13, filling the mixed powder into a pressing tube assembly and pressing a pyrophyllite tube on an isostatic press;

[0016] Step S14, placing the pressed pyrophyllite tube into an electric blast drying oven and baking it in a dry atmosphere at 60°C;

[0017] The baked pressed pyrophyllite tube was placed in a benchtop resistance furnace for sintering;

[0018] Step S15: Cut off 10 mm of material from the lower end of the sintered pyrophyllite tube, grind both sides flat, and divide it into three equal parts as hardness test samples. Use a hardness tester to test three points at different positions of each part of the hardness test sample, and take the average value. If the hardness value is within the range of 60-90 HRC, it is judged to be qualified and used as the first knife test piece.

[0019] As a preferred technical solution of the superhard tool testing method, step S2 includes:

[0020] Step S21, prefabricate and splice a plurality of second knife specimens;

[0021] Step S22: embedding and fixing a plurality of prefabricated and assembled second knife test bodies in the inner wall of the first knife test body to obtain the knife test piece.

[0022] As an optimal technical solution for the superhard tool testing method, in step S3, the linear speed and feed rate of the tool test piece rotating around the axis are set, and the superhard tool is used to continuously turn the first tool test piece at the linear speed and feed rate until the first tool test piece is completely turned.

[0023] As an optimal technical solution for the superhard tool testing method, in step S5, a corresponding relationship between the positions of different second tool specimens and the cutting process of the superhard tool is established, and the shedding of particles in the cavity of the second tool specimen is verified to characterize the cutting stability of the superhard tool in the corresponding turning process.

[0024] As an optimal technical solution for the superhard tool testing method, in step S5, the inner wall of the second tool test body is made of transparent material, the shedding state of the verification particles is obtained through visual acquisition, the residual number of verification particles is compared with the initial embedded number, and the shedding rate is calculated.

[0025] As a preferred technical solution of the superhard tool testing method, the superhard tool testing method further includes step S6: performing correlation analysis on the evaluation results of steps S4 and S5:

[0026] If the corresponding cutting area where the tool wear exceeds the standard value by 10% coincides with the position of the second tool specimen where the particle shedding rate is greater than 30%, it is determined that cutting instability exists in this area.

[0027] As a preferred technical solution for the superhard tool testing method, the material of the verification particles includes at least one of diamond micropowder, cubic boron nitride or cemented carbide particles, and the particle size range of a single verification particle is 50-200 μm.

[0028] On the other hand, the present invention provides a superhard tool trial material, which is applied to the superhard tool trial method described in any of the above schemes. The superhard tool trial material is made of mixed-granularity natural pyrophyllite powder, glass glue and pure water.

[0029] As the preferred technical solution for trial materials of superhard cutting tools, the particle size distribution of the mixed natural pyrophyllite powder is: 4% within 30 mesh, 11% between 30 and 60 mesh, 66% between 60 and 120 mesh, and 19% beyond 120 mesh.

[0030] Compared with the prior art, the beneficial effect of the present invention is that the present invention fundamentally changes the limitations of traditional single wear detection by setting up a split dynamic detection structure, namely the first tool test body and the second tool test body array, and configuring a dual evaluation mechanism, namely the simultaneous evaluation of two related characteristics, tool wear resistance and turning stability. The overall cutting process is decoupled into a continuous main cutting area and discrete dynamic monitoring points through a spatial decoupling design, so that the local state changes of the tool during continuous cutting can be captured independently; the present invention can create a unique mechanical transmission link: the verification particles in the cavity of the second tool test body constitute a mechanical monitoring network, and the cutting vibration energy is transmitted to the cavity through the tool test body, triggering the particle shedding behavior, and its shedding rate is positively correlated with the cutting impact force; and the cutting position and cutting stage can be located based on the shedding position, and a time-space mapping mechanism is set up to facilitate traceability analysis by strictly corresponding the position of the second tool test body to the turning process. In this way, the simultaneous quantification of wear resistance and stability is achieved, breaking through the bottleneck that traditional tests can only obtain end point data.

[0031] Furthermore, the present invention uses gradient screening and humidity control during the preparation of the first knife specimen, and precisely controls the particle size ratio and moisture content, so that the pressed talc tube forms a uniform microporous structure, generates stable cutting force during the turning process, and avoids wear data distortion due to local density differences in the material; two-stage heat treatment is combined with multi-point hardness testing to ensure the consistency of the axial hardness of the cylinder, so that the tool wear data only reflects its own performance differences rather than specimen fluctuations, providing a highly reliable benchmark carrier for wear resistance evaluation.

[0032] Furthermore, the continuous splicing between adjacent second knife specimens of the present invention retains the continuous cutting characteristics of the first knife specimen, avoiding the splicing seam from interfering with the main cutting process; the movement freedom of the particles is verified by cavity constraints, and the particles fall off due to inertial force only when the cutting vibration intensity exceeds the threshold, forming a mapping relationship between vibration intensity and shedding rate; real-time observation of the transparent inner wall directly captures the particle dynamics through optical means, and establishes a causal link between cutting force fluctuations, particle displacement, and shedding number.

[0033] Furthermore, the present invention enables optimal wear location mapping. When an area of ​​abnormal flank wear coincides with an area of ​​high particle shedding, it indicates that the cutting process is subject to sustained vibration loads rather than occasional impacts. The shedding rate threshold reflects the critical chatter intensity experienced by the tool. Combined with the wear increment, this allows those skilled in the art to distinguish between normal wear and vibration-accelerated failure, thereby locating the root cause of tool failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a structural block diagram of a superhard tool testing method according to an embodiment of the present invention;

[0035] Figure 2 Schematic diagram of the structure of the knife test piece in an embodiment of the present invention;

[0036] Figure 3 This is a schematic structural diagram of a pressing tube assembly according to an embodiment of the present invention;

[0037] Figure 4 Schematic diagram of the baking process of pyrophyllite tubes according to an embodiment of the present invention;

[0038] In the figure: 1. Plug; 2. End post; 3. Rubber sleeve; 4. Outer tube; 5. Rubber hose; 6. Powder; 7. Core rod; 8. First-cut specimen; 9. Second-cut specimen; 10. Verification particles; 11. Pyrophyllite tube rack; 12. Furnace table. DETAILED DESCRIPTION

[0039] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are merely used to explain the present invention and are not intended to limit the present invention.

[0040] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0041] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside", and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0042] Furthermore, it should be noted that, in the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0043] See also Figure 1 As shown in FIG, they are respectively a flow chart of a superhard tool testing method according to an embodiment of the present invention, and a structural schematic diagram of a tool test piece according to an embodiment of the present invention. The superhard tool testing method includes:

[0044] Step S1, preparing a first knife specimen 8 of a cylindrical structure;

[0045] Step S2: a plurality of second blade members 9 having cavities are radially spaced apart on the inner wall of the first blade member 8. The spaced apart second blade members 9 are spliced ​​together to cover the inner wall 8 of the first blade member structure, and the sides of the second blade members 9 facing away from the inner wall of the first blade member 8 are spliced ​​together to form a cylindrical structure with a smaller inner diameter.

[0046] Among them, a number of verification particles 10 with equal amount and equal position distribution are embedded in the cavity of the second knife specimen 8;

[0047] Step S3, installing the tool specimen formed by combining the first tool specimen and the second tool specimen on a lathe, and performing spiral turning on the first tool specimen using a superhard tool;

[0048] Step S4, comparing the dimensions of the contact portion of the superhard tool after the spiral turning and the standard superhard tool where the tools perform cutting to evaluate the wear resistance of the superhard tool;

[0049] Step S5: collecting the shedding state of the verification particles in the cavity of each second tool specimen to determine the cutting stability of the superhard tool when turning different parts of the first tool specimen.

[0050] In the above embodiment, a split dynamic detection structure, i.e., an array of the first and second tool test bodies, is provided, and a dual evaluation mechanism is configured, i.e., the evaluation of two related characteristics, tool wear resistance and turning stability, is performed simultaneously, which fundamentally changes the limitations of traditional single wear detection. The overall cutting process is decoupled into a continuous main cutting area and discrete dynamic monitoring points through a spatial decoupling design, so that the local state changes of the tool during continuous cutting can be captured independently; the present invention can create a unique mechanical transmission link: the verification particles in the cavity of the second tool test body constitute a mechanical monitoring network, and the cutting vibration energy is transmitted to the cavity through the tool test body, triggering the particle shedding behavior, and its shedding rate is positively correlated with the cutting impact force; and the cutting position and cutting stage can be located based on the shedding position, and a time-space mapping mechanism is provided to facilitate traceability analysis by strictly corresponding the position of the second tool test body to the turning process. This achieves the simultaneous quantification of wear resistance and stability, breaking through the bottleneck that traditional tests can only obtain end-point data.

[0051] Specifically, step S1 includes:

[0052] Step S11: Pour the mixed particle size pyrophyllite powder into a rotary vibrating sieve for particle size screening, and extract powders of different particle sizes according to a preset ratio; in this embodiment, the screening and extraction are performed based on the dosage in the following table:

[0053] A particle size B particle size C particle size D particle size Total weight of powder weight 3.2kg 8.8kg 52.8kg 15.2kg 80kg Proportion 4% 11% 66% 19% /

[0054] Step S12: Pour the extracted powder into a mixing machine in the bedroom, add glass glue (sodium silicate solution) at a ratio of 5%-8% by weight of the powder, and add purified water to mix. Use a powder moisture detector to test the moisture content of the powder. If it is within the range of 1%-5%, it is determined to be qualified and proceed to the next step.

[0055] Step S13, see Figure 3 As shown, the mixed powder 6 is filled into Figure 3 In the pressed tube assembly shown, a pyrophyllite tube is pressed on an isostatic press. The pressed tube assembly includes a plug 1, an end post 2, a rubber sleeve 3, an outer tube 4, a rubber hose 5, and a core rod 7;

[0056] Step S14, the pressed pyrophyllite tube is placed in an electric blast drying oven and baked in a dry atmosphere at 60°C. The electric blast drying oven includes a pyrophyllite tube placement rack 11 and a furnace table 12. The pressed pyrophyllite tube is placed in the desktop resistance furnace in the following manner: Figure 4 As shown; the baked pressed pyrophyllite tube is placed in a desktop resistance furnace for sintering and baked in a dry atmosphere at 60°C;

[0057] In step S15, 10 mm of material is cut from the lower end of the sintered pyrophyllite tube. Both sides are polished and divided into three equal parts to serve as hardness test samples. A hardness tester is used to measure three points at different locations on each part of the test sample. The average hardness value is calculated. If the hardness value is within the range of 60-90 HRC, it is considered qualified and used as the first cutting tool specimen. It should be understood that for superhard material cutting tools of different hardness, the qualified hardness range can be adjusted according to actual working conditions.

[0058] In the above embodiment, through gradient screening and humidity control in the preparation process of the first knife specimen, and through precise control of particle size ratio and moisture content, the pressed talc tube forms a uniform microporous structure, which generates stable cutting force during the turning process, avoiding distortion of wear data due to local density differences of the material; two-stage heat treatment combined with multi-point hardness testing ensures the consistency of the axial hardness of the cylinder, so that the tool wear data only reflects its own performance differences rather than specimen fluctuations, providing a highly reliable benchmark carrier for wear resistance evaluation.

[0059] Specifically, step S2 includes:

[0060] Step S21, prefabricate and splice a plurality of second knife specimens;

[0061] Step S21 ensures high consistency in the material properties and cavity structure of each second-cut specimen, eliminating individual variations caused by on-site assembly. Prefabricated in a controlled environment, the individual pieces are precision-machined to ensure that the cavity volume, wall thickness, and verification particle distribution meet design tolerances, preventing data distortion from specimen deviations during subsequent turning. The splicing design establishes a continuous load transfer path, ensuring lossless transmission of cutting vibration energy to the verification particles. Conformal contact (either planar close-fitting or concave-convex meshing in this embodiment) is employed on the splicing surfaces of adjacent second-cut specimens, ensuring low attenuation of vibration waves as they propagate across the array, maintaining monitoring fidelity.

[0062] In step S22, several prefabricated and assembled second cutting blades are embedded and fixedly connected to the inner wall of the first cutting blade, thereby obtaining the cutting blade specimen. The fixed connection design enables mechanical coupling between the first cutting blade and the second cutting blade array, ensuring synchronous transmission of cutting loads. The embedded connection creates a rigid constraint in the radial direction while retaining a slight elastic float in the tangential direction, ensuring efficient transmission of vibration energy while preventing structural cracking caused by resonance.

[0063] Specifically, in step S3, the linear speed and feed rate of the tool specimen rotating around the axis are set, and the superhard tool is used to continuously turn the first tool specimen at the linear speed and feed rate until the first tool specimen is turned. In detail, based on the standard ISO / CNMW12020, the diamond composite sheet is cut into a standard tool head of 12.7×12.7×R0.4, and the pyrophyllite tube is processed on a lathe. The main turning parameters are: the linear speed of the first tool specimen rotation v=215m / min, and the feed rate a=0.2mm / r.

[0064] To analyze tool cutting stability, in step S5, a correspondence is established between the positions of different second specimens and the cutting progress of the superhard tool. The shedding of verification particles within the cavity of the second specimen is used to characterize the cutting stability of the superhard tool during the corresponding turning process. Specifically, in step S5, a strict temporal mapping relationship is established between the spatial position of the second specimen and the turning progress, transforming the discretely distributed verification particle cavity units into dynamic monitoring nodes of a continuous cutting trajectory. The core principle is that when the superhard tool turns to the corresponding section of the second specimen, cutting vibration energy is transmitted through the substrate of the first specimen to the embedded cavity structure, causing the verification particles within the cavity to displace due to inertial forces. The number of particles that shed is positively correlated with the intensity of the vibration energy transmitted to the cavity, and the vibration energy directly reflects the degree of load fluctuation of the tool in that cutting section. Therefore, the particle shedding state captured by each second specimen becomes a direct mechanical representation of the cutting stability at that spatial coordinate point, ultimately reconstructing the discrete monitoring data into a quantitative distribution map of the tool's entire cutting stability.

[0065] Specifically, in step S5, the inner wall of the second cutting specimen is made of a transparent material, and the shedding state of the verification particles is obtained through visual acquisition. The remaining number of verification particles is compared with the initial embedded number to calculate the shedding rate. In the above embodiment, a non-invasive optical monitoring channel is constructed by setting the inner wall of the second cutting specimen to a transparent material. The core working principle is that when the turning process reaches the corresponding section of the specific second cutting specimen, the high-frequency vibration energy causes the verification particles in the cavity to produce inertial displacement, and the transparent inner wall allows external visual equipment to directly capture the dynamic behavior of the particles. By comparing the pixel feature differences between the real-time image and the initial embedded state, the number of particles that have escaped from the fixed position can be accurately identified. This design realizes in-situ, non-destructive data acquisition - the physical phenomenon of vibration energy triggering particle displacement is directly converted into an optical signal, avoiding the mechanical disturbance error caused by traditional disassembly detection, so that the calculated shedding rate truly reflects the stability level of the dynamic load on the tool during this cutting stage.

[0066] Specifically, the superhard tool testing method further includes step S6: performing correlation analysis on the evaluation results of steps S4 and S5:

[0067] If the corresponding cutting area where tool wear exceeds 10% of the standard value coincides with the position of the second tool specimen where the particle shedding rate is greater than 30%, cutting instability is determined to exist in that area. The above embodiment can achieve a better wear position mapping. When the abnormal tool wear area coincides with the high particle shedding area, it indicates that the cutting section is subject to continuous vibration load rather than occasional impact. The shedding rate threshold reflects the critical vibration intensity to which the tool is subjected. At this time, combined with the wear increment, it is convenient for those skilled in the art to distinguish between normal wear and vibration-accelerated failure. This can then locate the root cause of tool failure.

[0068] Specifically, the material of the verification particles includes at least one of diamond micropowder, cubic boron nitride or cemented carbide particles, and the particle size of a single verification particle ranges from 50 to 200 μm.

[0069] On the other hand, this embodiment provides a superhard tool trial material, which is applied to the superhard tool trial method described in any of the above schemes. The superhard tool trial material is made of mixed-granularity natural pyrophyllite powder, glass glue and pure water.

[0070] The flowchart or block diagram in the accompanying drawings illustrates the possible implementation architecture, functions and operations of the device, method and computer program product according to various embodiments of the present application. In this regard, each box in the flowchart or block diagram can represent a module, program segment or a part of code, and the module, program segment or a part of code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order than that marked in the accompanying drawings. For example, two boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flowchart, and the combination of the boxes in the block diagram and / or flowchart can be implemented with a dedicated hardware-based device that performs the specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0071] Thus far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art may make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will fall within the scope of protection of the present invention.

[0072] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A superhard tool test method for testing the wear resistance of superhard tools, characterized in that: include: Step S1, preparing a first knife specimen of a cylindrical structure; Step S2: a plurality of second blade members with cavities are radially spaced apart on the inner wall of the first blade member, wherein the spaced apart second blade members are spliced ​​together to cover the inner wall of the first blade member structure, and the sides of the second blade members facing away from the inner wall of the first blade member are spliced ​​together to form a cylindrical structure with a smaller inner diameter; The cavity of the second knife specimen is embedded with a number of verification particles distributed in equal amounts and positions; Step S3, installing the tool specimen formed by combining the first tool specimen and the second tool specimen on a lathe, and performing spiral turning on the first tool specimen using a superhard tool; Step S4, comparing the dimensions of the contact portion of the superhard tool after the spiral turning and the standard superhard tool where the tools perform cutting to evaluate the wear resistance of the superhard tool; Step S5: collecting the shedding state of the verification particles in the cavity of each second tool specimen to determine the cutting stability of the superhard tool when turning different parts of the first tool specimen.

2. The superhard tool testing method according to claim 1, characterized in that: The step S1 comprises: Step S11, pouring the mixed particle size pyrophyllite powder into a rotary vibrating sieve for particle size screening, and extracting powders of different particle sizes according to a preset ratio; Step S12: Pour the extracted powder into a bedroom mixer, add glass glue and purified water in a specified proportion, mix, and use a powder humidity detector to test the water content of the powder. If it is within the range of 1%-5%, it is determined to be qualified and proceed to the next step; Step S13, filling the mixed powder into a pressing tube assembly and pressing a pyrophyllite tube on an isostatic press; Step S14, placing the pressed pyrophyllite tube into an electric blast drying oven and baking it in a dry atmosphere at 60°C; The baked pressed pyrophyllite tube was placed in a benchtop resistance furnace for sintering; Step S15: Cut off 10 mm of material from the lower end of the sintered pyrophyllite tube, grind both sides flat, and divide it into three equal parts as hardness test samples. Use a hardness tester to test three points at different positions of each part of the hardness test sample, and take the average value. If the hardness value is within the range of 60-90 HRC, it is judged to be qualified and used as the first knife test piece.

3. The superhard tool testing method according to claim 1, wherein: The step S2 comprises: Step S21, prefabricate and splice a plurality of second knife specimens; Step S22: embedding and fixing a plurality of prefabricated and assembled second knife test bodies in the inner wall of the first knife test body to obtain the knife test piece.

4. The superhard tool testing method according to claim 1, wherein: In the step S3, the linear speed and feed rate of the tool specimen rotating around the axis are set, and the first tool specimen is continuously turned by the superhard tool at the linear speed and feed rate until the first tool specimen is completely turned.

5. The superhard tool testing method according to claim 1, wherein: In step S5, a correspondence between different second tool specimen positions and the superhard tool cutting process is established, and the shedding of verification particles in the cavity of the second tool specimen is used to characterize the cutting stability of the superhard tool in the corresponding turning process.

6. The superhard tool testing method according to claim 5, characterized in that: In step S5, the inner wall of the second test piece is made of transparent material, and the shedding state of the verification particles is obtained by visual acquisition. The remaining number of the verification particles is compared with the initial embedded number to calculate the shedding rate.

7. The superhard tool testing method according to claim 6, characterized in that: The superhard tool testing method further includes step S6: performing correlation analysis on the evaluation results of steps S4 and S5: If the corresponding cutting area where the tool wear exceeds the standard value by 10% coincides with the position of the second tool specimen where the particle shedding rate is greater than 30%, it is determined that cutting instability exists in this area.

8. The superhard tool testing method according to claim 1, wherein: The material of the verification particles includes at least one of diamond micropowder, cubic boron nitride or cemented carbide particles, and the particle size of a single verification particle ranges from 50 to 200 μm.

9. A superhard cutting tool trial material, characterized in that: The superhard cutting tool testing method according to any one of claims 1 to 8 is prepared from natural pyrophyllite powder of mixed particle size, glass glue and purified water.

10. The superhard cutting tool trial material according to claim 9, characterized in that: The particle size distribution of the mixed-size natural pyrophyllite powder is as follows: 4% of the particle size is within 30 mesh, 11% of the particle size is between 30 and 60 mesh, 66% of the particle size is between 60 and 120 mesh, and 19% of the particle size is beyond 120 mesh.

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