Test specimens and test methods for tool coating performance

Abstract

This invention provides a test specimen and a method for testing the performance of a cutting tool coating. The specimen includes a specimen substrate and a coating covering the surface of the substrate. The surface of the specimen includes an outer peripheral surface, a first plane, and a second plane. The outer peripheral surface and the second plane intersect to form an edge. The edge is used for brushing tests, and the first plane is used for scratch or indentation tests. The method for testing the performance of the cutting tool coating includes performing an indentation or scratch test on the first plane and a brushing test on the edge. The specimen of this invention can be applied to various tests, and multiple tests can be performed on the same specimen, thereby reducing the number of specimens required in the research of cutting tools, thus saving testing costs and improving testing efficiency.

Description

Technical Field

[0001] This invention relates to the field of coating performance testing technology, and in particular to a test specimen and method for testing the performance of tool coatings. Background Technology

[0002] Coated cutting tools are a common type of tool. For example, diamond-coated tools are a frequently used type of tool for machining workpieces. Diamond tools consist of a substrate and a diamond coating, with the diamond coating applied to the surface of the substrate. The properties of the coating (e.g., the bonding strength between the coating and the substrate) have a significant impact on the tool's performance.

[0003] To better evaluate the performance of tool coatings, some engineers fabricate a coated specimen and perform relevant tests on it. The test results of this specimen's coating can reflect the performance of the tool coating, and this testing does not require tool wear and tear. However, when multiple tests are required on a specimen, to ensure accuracy, multiple specimens need to be fabricated and different tests performed on different specimens. Fabricating multiple specimens is neither conducive to improving testing efficiency nor to saving testing costs. Summary of the Invention

[0004] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes a test specimen for tool coating performance, on which multiple tests can be performed, thereby improving testing efficiency and saving testing costs. This invention also proposes a method for testing tool coating performance, which performs multiple tests on the same specimen, thereby reducing the number of specimens required in the research process of tools, thus saving testing costs and improving testing efficiency.

[0005] According to an embodiment of the first aspect of the present invention, a tool coating performance test specimen includes: a specimen substrate and a specimen coating covering the outer surface of the specimen substrate, the outer surface of the specimen including an outer peripheral surface, a first plane and a second plane, the outer peripheral surface and the second plane intersecting to form a corner, the corner being used for brushing test, and the first plane being used for scratch test or indentation test.

[0006] The tool coating performance test specimen according to the first aspect of the present invention has at least the following beneficial effects:

[0007] (1) The specimen of the present invention has both an edge for brushing test and a first plane for indentation test or scratch test, and the specimen can perform multiple tests at the same time. Therefore, when multiple tests are required to test the coating performance of a tool, multiple tests can be performed using a single specimen, reducing the total number of specimens required during the test process, which helps to save test costs and improve test efficiency.

[0008] (2) The various tests required for the sample are performed at different parts of the sample, which helps to reduce interference between different tests and improve the accuracy of individual tests.

[0009] (3) The edges and corners are used to simulate the shape of the cutting edge of the tool. Brushing the edges and corners is beneficial to make the brushing test results of the sample more accurately reflect the coating bonding strength at the cutting edge of the tool.

[0010] According to some embodiments of the present invention, the central axis of the specimen is located on the first plane.

[0011] According to some embodiments of the present invention, the first plane and the second plane are parallel to each other, and the first plane and the second plane are arranged sequentially along the inner normal direction of the first plane.

[0012] According to some embodiments of the present invention, the second plane is located at one end of the sample.

[0013] A tool coating performance testing method according to a second aspect of the present invention includes: obtaining the coating performance of a tool under study by testing a sample, the tool coating performance testing method comprising: manufacturing a sample, the sample comprising a sample substrate and a sample coating covering the outer surface of the sample substrate, the outer surface of the sample comprising an outer peripheral surface, a first plane and a second plane, the outer peripheral surface and the second plane intersecting to form an edge corner, the tool comprising a tool substrate and a tool coating covering the outer surface of the tool substrate, the material of the tool substrate being the same as the material of the sample substrate, and the material of the tool coating being the same as the material of the sample coating; performing a brushing test on the edge corner; and performing a scratch test or an indentation test on the first plane.

[0014] The tool coating performance testing method according to a second aspect of the present invention has at least the following advantages: The testing method allows for multiple tests to be performed on the same sample, thereby obtaining the coating performance of the sample and evaluating the coating performance of the tool. Furthermore, when multiple tests are required, this testing method requires a smaller total number of samples, which helps to save on the overall testing cost and improve testing efficiency.

[0015] According to some embodiments of the present invention, the corner is the same as the wedge angle of the cutting edge of the tool.

[0016] According to some embodiments of the present invention, the manufacturing of the sample includes the following steps: placing the sample substrate and the tool substrate in the same coating preparation equipment, and under the same coating preparation environment, making the sample coating cover the surface of the sample substrate and making the tool coating cover the surface of the tool substrate.

[0017] According to some embodiments of the present invention, the manufacturing of the specimen includes: removing a portion of a circular shaft to obtain an intermediate body, the intermediate body including a first part and a second part connected to each other, the cross-sectional area of ​​the first part being smaller than the cross-sectional area of ​​the second part, the first part having a transition plane, the normal of the transition plane being perpendicular to the central axis of the circular shaft; removing a portion of the first part to obtain a second base surface, the remaining portion of the transition plane serving as a first base surface; applying a specimen coating to cover the first base surface to form a first plane, and applying the specimen coating to cover the second base surface to form a second plane.

[0018] According to some embodiments of the present invention, the central axis of the sample substrate is located on the first base surface, the first base surface is parallel to the second base surface, the first base surface and the second base surface are arranged sequentially along the inner normal direction of the transition plane, and the step of removing a part of the first part to obtain the second base surface includes: grinding one end of the first part, the grinding depth of the first part is H, the radius of the circular shaft is R, and the angle of the corner is α, satisfying: H=Rsin(π / 2-α).

[0019] According to some embodiments of the present invention, the cutting diameter of the cutting tool is the same as the diameter of the circular shaft.

[0020] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0022] Figure 1 This is a front view of a sample in one embodiment of the present invention;

[0023] Figure 2 for Figure 1 Left view of the sample in the image;

[0024] Figure 3 This is a schematic diagram of an intermediate body formed after the first grinding of a round shaft during the sample processing in one embodiment of the present invention;

[0025] Figure 4 for Figure 3 The left view of the intermediate body shown;

[0026] Figure 5 This is a three-dimensional structural diagram of a cutting tool according to one embodiment of the present invention;

[0027] Figure 6 for Figure 5 The front view of the cutting tool in the image;

[0028] Figure 7 for Figure 6 A cross-sectional view of the cutting tool along section AA;

[0029] Figure 8 for Figure 7 Enlarged view of region B in the middle;

[0030] Figure 9 This is a schematic diagram of a tool coating performance testing method in one embodiment of the present invention;

[0031] Figure 10 This is a schematic diagram of the sample manufacturing process in one embodiment of the present invention.

[0032] Figure label:

[0033] 101-Sample, 102-First plane, 103-Second plane, 104-Outer circumferential surface, 105-Corner;

[0034] 200 - Intermediate body, 201 - First part, 202 - Second part, 203 - First base plane, 204 - Second base plane, 205 - Transition plane;

[0035] 301 - Cutting tool, 302 - Blade. Detailed Implementation

[0036] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0037] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0038] In the description of this invention, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0039] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0040] Unless otherwise specified, the cutting tools mentioned in the embodiments section of this invention refer to the cutting tools whose coating performance needs to be studied, that is, the cutting tools that need to be studied by testing the samples.

[0041] Figure 1 and Figure 2 This illustration shows a tool coating performance test according to an embodiment of the present invention (hereinafter referred to as the specimen, corresponding to reference numeral "101" in the accompanying drawings). Specimen 101 includes a specimen substrate and a specimen coating, the specimen coating covering the surface of the specimen substrate. The specimen substrate can be a rod-shaped component made of an alloy material, or it can be made of other non-metallic materials, as long as the surface of the specimen substrate allows the specimen coating to adhere. (In conjunction with...) Figure 1 and Figure 2 The outer surface of sample 101 includes an outer peripheral surface 104, a first plane 102, and a second plane 103. For example... Figure 2 As shown, the outer peripheral surface 104 intersects with the second plane 103 to form a corner 105. The corner 105 is used for brushing tests, while the first plane 102 is used for indentation or scratch tests.

[0042] The brushing test on the corner 105 specifically refers to brushing the corner 105 with a brush. The brush used for brushing the corner 105 has bristles containing abrasive grains. The hardness of the abrasive grains is higher than the hardness of the base material of the bristles. When the brush brushes the corner 105 of the sample 101, the wear on the sample coating is mainly caused by the abrasive grains. For example, in one embodiment, the sample coating is a diamond coating, and correspondingly, the abrasive grains can be diamond abrasive grains. After brushing the corner 105 for a certain period of time, a certain degree of wear will appear on the corner 105. Wear means that the sample coating peels off, resulting in a portion of the sample substrate surface being exposed. The tester can observe the wear area at the corner 105 of the sample 101 and judge the bonding strength between the sample coating and the sample substrate based on the size of the wear area. Generally, the larger the wear area of ​​the sample 101, the lower the bonding strength of the sample coating.

[0043] An indentation test is performed on the first plane 102 by pressing an indenter onto the first plane 102. As the load on the indenter gradually increases, pits will appear on the sample coating of the first plane 102. After the tester plots the curve between the load on the indenter and the depth of the pit, the mechanical properties of the sample coating can be obtained.

[0044] A scratch test is performed on the first plane 102 by scratching it with a sharp object, attempting to create a scratch. During the test, the load on the sharp object is gradually increased until the sample coating on the first plane 102 is damaged. The load on the sharp object at which the sample coating is damaged is the critical load. The coating adhesion strength of the sample 101 is related to the critical load. Generally, the higher the critical load, the higher the coating adhesion strength of the sample 101.

[0045] The specimen 101 of the present invention has both an edge 105 for brushing tests and a first plane 102 for indentation or scratch tests, and the specimen 101 can perform multiple tests simultaneously. Therefore, when multiple tests are required to test the coating performance of a tool, multiple tests can be performed using a single specimen 101, reducing the total number of specimens 101 that need to be manufactured during the testing process. This helps to save testing costs and improve testing efficiency.

[0046] The various tests required for the sample 101 are performed on different parts of the sample 101, which helps to reduce interference between different tests and improve the accuracy of individual tests. For example, in some embodiments, the corner 105 needs to undergo a brushing test first. After the brushing test, the sample coating at the corner 105 will be worn, and the sample coating at the edge of the second plane 103 will also be worn. Compared to the sample coating on the second plane 103 which is completely unworn, the performance of the sample coating on the second plane 103 after the brushing test may be reduced. If an indentation test or scratch test is performed on the second plane 103 after the brushing test, the results obtained from the indentation test or scratch test cannot accurately characterize the original performance of the sample coating. In addition, if the worn area of ​​the sample coating on the second plane 103 is large after the brushing test, the second plane 103 may not be able to provide sufficient test area for the indentation test or scratch test. Therefore, designing different parts of the sample 101 for different tests helps to reduce the interference of the previous test item on the subsequent test item, thereby facilitating multiple tests to be performed on one sample 101 and improving the accuracy of individual tests.

[0047] In addition, the corner 105 is used to simulate the shape of the cutting edge of the tool. Brushing the corner 105 helps to make the brushing test results of the sample 101 more accurately reflect the coating bonding strength at the cutting edge of the tool.

[0048] Figure 1 and Figure 2 The specimen 101 shown can be machined from a round shaft. How to machine a round shaft into the specimen 101 of this invention will be explained in detail below when the tool coating performance test method is introduced. The specific shape of the specimen 101 will be described first below.

[0049] like Figure 1 As shown, in one embodiment, the central axis of the sample 101 is located on the first plane 102. The central axis of the sample 101 is... Figure 1 Line C in the diagram. The central axis of specimen 101 lying on the first plane 102 means that there are at least two points on the first plane 102 that lie on the central axis of specimen 101. Since the central axis of specimen 101 lies on the first plane 102, the normal to the first plane 102 is perpendicular to the central axis of specimen 101, and the width of the first plane 102 is equal to the diameter of specimen 101. For example... Figure 2 As shown, the width of the first plane 102 refers to the dimension of the first plane 102 in the front-to-back direction; as Figure 1 As shown, the length of the first plane 102 refers to the dimension of the first plane 102 along the axial direction of the sample 101 (the dimension in the left-right direction). Figure 1 In the first plane 102, the length is L1.

[0050] Compared to the case where the first plane 102 is parallel to the central axis of the sample 101, having the central axis of the sample 101 located on the first plane 102 allows the width of the first plane 102 to be equal to the diameter of the sample 101, thus increasing the width of the first plane 102. With the length of the first plane 102 remaining constant, the increased width means an increased area. A larger area on the first plane 102 provides a larger testing area for indentation or scratch testing, facilitating the testing process.

[0051] Combination Figure 1 and Figure 2 In one embodiment, with the central axis of sample 101 located on the first plane 102, the first plane 102 and the second plane 103 are parallel to each other, and the first plane 102 and the second plane 103 are arranged sequentially along the inner normal direction of the first plane 102. The inner normal of the first plane 102 is not specifically shown in the figure, but can be found by referring to... Figure 2 The direction of the inner normal of the first plane 102 can correspond to Figure 2 The direction from top to bottom in the first plane 102 corresponds to the direction of the outer normal. Figure 2 The direction is from bottom to top. This setting facilitates both the processing of the sample 101 and the control of the angle α of the corner 105. Specifically, by controlling the distance between the first plane 102 and the second plane 103, the corner 105 can be processed to the angle desired by the tester.

[0052] like Figure 1 As shown, with the first plane 102 and the second plane 103 arranged sequentially along the inner normal direction of the first plane 102, the second plane 103 is located at one end of the specimen 101. This arrangement is intended to facilitate the processing of the specimen 101 and to ensure that the specimen 101 itself has sufficient mechanical strength to prevent deformation or breakage due to external loads during testing. (Refer to...) Figure 1 In specimen 101, the cross-sectional area of ​​the portion where the first plane 102 is located (the portion corresponding to length L1) is smaller, while the cross-sectional area of ​​the portion where the second plane 103 is located (the portion corresponding to length L2) is larger. The cross-section referred to here is the section obtained by cutting specimen 101 using a plane whose normal direction is the same as the axial direction of specimen 101. Based on Figure 1 If the second plane 103 is placed at the end of the sample 101, then the first plane 102 will be located in the middle of the sample 101. The middle part of the sample 101 will be relatively thin, resulting in lower mechanical strength and easier breakage. Placing the first plane 102 at the end of the sample 101 avoids the problem of excessively low mechanical strength.

[0053] Based on the aforementioned sample 101, the present invention also provides a method for testing the coating performance of a cutting tool (hereinafter referred to as the testing method). This testing method obtains the coating performance of the cutting tool 301 under study by testing the sample 101 (the shape of the cutting tool 301 can be referenced). Figure 5 and Figure 6 ), refer to Figure 9 In one embodiment, the testing method includes the following steps:

[0054] S1: Manufacturing a sample 101; wherein, the sample 101 includes a sample substrate and a sample coating covering the outer surface of the sample substrate, the outer surface of the sample 101 includes an outer peripheral surface 104, a first plane 102 and a second plane 103, the outer peripheral surface 104 and the second plane 103 intersect to form an edge 105, the cutting tool 301 includes a cutting edge substrate and a cutting tool coating covering the outer surface of the cutting edge substrate, the material of the cutting edge substrate is the same as the material of the sample substrate, and the material of the cutting tool coating is the same as the material of the sample coating.

[0055] S2: Perform a brushing test on the 105 edge;

[0056] S3: Perform a scratch test or an indentation test on the first plane 102.

[0057] In this invention, the designations "S1", "S2", and "S3" are mainly used to facilitate further explanation of the test method below. These designations do not strictly limit the order of the steps. In the above test method, steps S2 and S3 are both performed after the sample 101 is manufactured (i.e., after step S1). However, there is no specific restriction on the relative order between steps S2 and S3. Step S2 can be performed after step S3 or before step S3.

[0058] The cutting edge substrate and the sample substrate can be made of the same alloy material; if the cutting edge coating is a diamond coating, then the sample coating should also be a diamond coating. Of course, the cutting edge coating can also be other types of coatings such as rust-proof coatings and corrosion-proof coatings, as long as the sample coating and the cutting edge coating are the same coating.

[0059] The above testing method allows for multiple tests to be performed on the same sample 101, thereby obtaining the coating performance of the sample 101 and evaluating the coating performance of the tool 301. Furthermore, when multiple tests are required, this testing method requires a smaller total number of samples 101 to be manufactured, which helps to save on overall testing costs and improve testing efficiency.

[0060] In one embodiment, the corner 105 is the same as the wedge angle of the cutting edge 302 of the tool 301. The wedge angle of the cutting edge 302 will be explained below. Figure 5 As shown, the tool 301 is a milling cutter, and the tool 301 includes multiple cutting edges 302 distributed along the circumferential direction. Figure 6 for Figure 5 The front view of tool 301 in the middle, Figure 7 for Figure 6 A cross-sectional view of tool 301 in the middle. Figure 8 for Figure 7 An enlarged schematic diagram of one of the blades 302; the wedge angle can be referenced. Figure 8 .like Figure 8 As shown, the wedge angle of blade 302 is β, the rake angle of blade 302 is γ, and the clearance angle of blade 302 is θ. These three angles satisfy: β + γ + θ = 90°. As mentioned above, if the angle of side angle 105 is denoted as α (e.g.... Figure 2 As shown in the figure, when the angle 105 and the wedge angle of the tool 301 are the same, the angle between the angle 105 and the wedge angle satisfies: α = β.

[0061] The setting that "the corner 105 has the same wedge angle as the cutting edge 302 of the tool 301" can improve the structural similarity between the corner 105 and the cutting edge 302, thereby improving the similarity between the coating bonding strength at the corner 105 and the coating bonding strength at the cutting edge 302 of the tool 301. This allows the brushing test results of the corner 105 to well reflect the coating bonding strength at the cutting edge 302 of the tool 301.

[0062] The specific process for manufacturing sample 101 will now be explained. (Refer to...) Figure 10 In one embodiment, step S1 (manufacturing sample 101) of the above-described testing method includes the following steps:

[0063] S11: Remove a portion of the circular shaft to obtain an intermediate body 200. The intermediate body 200 includes a first part 201 and a second part 202 that are connected to each other. The cross-sectional area of ​​the first part 201 is smaller than that of the second part 202. The first part 201 has a transition plane 205. The normal of the transition plane 205 is perpendicular to the central axis of the circular shaft.

[0064] S12: Remove a portion of the first part 201 along the inner normal direction of the transition plane 205 to obtain the second base plane 204, and the part of the transition plane 205 that is not removed is used as the first base plane 203;

[0065] S13: Cover the first base surface 203 with a sample coating to form a first plane 102, and cover the second base surface 204 with a sample coating to form a second plane 103.

[0066] Step S11, the process for removing a portion of the cylindrical shaft can be a grinding process. In step S12, a portion of the first part 201 can also be removed by grinding. The initial shape of the cylindrical shaft is a cylinder; after step S11, the cylindrical shaft transforms into the shape shown below. Figure 3 The intermediate 200 shown. Figure 3 In the diagram, the part to the left of the dashed line E is the first part 201, and the part to the right of the dashed line E is the second part 202. The second part 202 can also be considered as the part of the round shaft that has not been processed by a removal process (such as grinding) after step S11. Figure 3 The transition plane 205 is specifically marked in the middle. Figure 3 In the diagram, the plane corresponding to line segment FJ is the transition plane 205.

[0067] The inner normal direction of transition plane 205 corresponds to Figure 3 The top-to-bottom direction in the middle, therefore, based on Figure 3 The intermediate body 200 shown can have its top part 201 ground off from top to bottom during step S12. Figure 3In the diagram, the area enclosed by points F, G, H, and I is the part of the first section 201 that needs to be ground away. After this part is ground away, the remaining portion of the transition plane 205 corresponds to line segment IJ, the remaining portion of the transition plane 205 is the first base surface 203, and the plane corresponding to line segment GH is the second base surface 204. Thus, after steps S11 and S12, the circular shaft is transformed into an intermediate body 200 and then into a sample substrate. Subsequently, a sample coating is applied to the surface of the sample substrate to obtain... Figure 1 The specimen 101 shown has a first base surface 203 covered with a specimen coating, which serves as a first plane 102, and a second base surface 204 covered with a specimen coating, which serves as a second plane 103. After the round shaft is transformed into a specimen substrate through two grinding processes, the remaining part of the original circumferential surface of the round shaft is covered by the specimen coating, thus serving as the outer circumferential surface 104 of the specimen 101.

[0068] It should be noted that the sample coating is usually quite thin, typically less than 10 μm. It can be approximated that the sample substrate and sample 101 have the same shape; or it can be approximated that if the central axis of sample 101 needs to be located on the first plane 102, then the central axis of the sample substrate can be located on the first base surface 203 during the grinding process, and then the sample coating can be applied to the first base surface 203.

[0069] In one embodiment, with the central axis of the sample 101 located on the first plane 102, the first base surface 203 parallel to the second base surface 204, and the first base surface 203 and the second base surface 204 sequentially arranged along the inner normal direction of the transition plane 205, step S12 of the test method specifically includes: grinding one end of the first part 201, with a grinding depth of H, a radius of R for the circular shaft, and an angle α for the corner 105, satisfying: H = Rsin(π / 2 - α). This step can control the angle α of the corner 105 simply by controlling the grinding depth H, which helps to reduce the difficulty of machining the required corner 105 on the sample 101, thereby reducing the machining difficulty of the sample 101.

[0070] like Figure 1 and Figure 2 As shown, the grinding depth refers to the distance between the first datum surface 203 and the second datum surface 204 along the inner normal direction of the first datum surface 203. Figure 2 As shown, the angle of corner 105 is: draw a tangent line to the outer peripheral surface 104 at the intersection of the outer peripheral surface 104 and the second plane 103, and the angle (take the acute angle) between this tangent line and the second plane 103 is the angle of corner 105. Since H = Rsinα, R is fixed when the circular shaft has been selected. Therefore, adjusting the grinding depth H can adjust the angle α of corner 105 of sample 101.

[0071] The diameter of the circular shaft used to process the sample substrate can be the same as the cutting diameter of the tool 301. This makes the dimensions of the edge 105 of the sample 101 closer to the dimensions of the cutting edge 302 of the tool 301, thereby improving the simulation effect of the test results of the sample 101 on the coating performance of the tool 301.

[0072] In one embodiment, step S1 of the testing method further includes step S14, which includes: simultaneously placing the sample substrate and the blade substrate in the same coating preparation equipment, and under the same preparation environment, covering the surface of the sample substrate with the sample coating and covering the surface of the blade substrate with the blade coating. The step S13 mentioned above, "covering the sample coating on the first base surface 203 to form a first plane 102, and covering the sample coating on the second base surface 204 to form a second plane 103," can specifically be implemented during the process of "covering the surface of the sample substrate with the sample coating" in step S14. That is, step S14 is performed after step S12, and S13 is equivalent to a part of step S14.

[0073] The coating on the sample and the sample substrate, as well as the coating on the cutting tool and the cutting edge substrate, can be bonded using methods such as PVD (Physical Vapor Deposition) and CVD (Chemical Vapor Deposition). Accordingly, the coating preparation equipment mentioned in step S14 can be a PVD device, a CVD device, etc. The cutting edge substrate and the sample substrate can be placed in the same coating preparation equipment, and under the same temperature and pressure environment, the coating gradually deposits on the surface of both the cutting edge substrate and the sample substrate.

[0074] The advantage of setting step S14 in the test method is that it can reduce the difference between the coating preparation process of sample 101 and the coating preparation process of tool 301, thereby enabling the test results of sample 101 to better reflect the coating performance of tool 301. If the coating preparation processes of sample 101 and tool 301 are different, even if the coating materials are the same, the performance of the sample coating and the coating performance of tool 301 may differ due to the different processes, resulting in a large error between the test results of sample 101 and the actual coating performance of tool 301.

[0075] In the description of this invention, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

Claims

1. A test specimen for testing the performance of a cutting tool coating, characterized in that, The sample includes a sample substrate and a sample coating covering the outer surface of the sample substrate. The outer surface of the sample includes an outer peripheral surface, a first plane, and a second plane. The outer peripheral surface and the second plane intersect to form a corner. The corner is used for brushing tests. The wedge angle of the cutting edge of the tool under study is the same as the corner. The first plane is used for scratch tests or indentation tests.

2. The test specimen for testing the performance of the tool coating according to claim 1, characterized in that, The central axis of the sample is located on the first plane.

3. The test specimen for testing the performance of the tool coating according to claim 2, characterized in that, The first plane and the second plane are parallel to each other, and the first plane and the second plane are arranged sequentially along the inner normal direction of the first plane.

4. The test specimen for testing the performance of the tool coating according to claim 3, characterized in that, The second plane is located at one end of the sample.

5. A method for testing the performance of tool coatings, characterized in that, The coating performance of the tool under study is obtained by testing the sample. The tool coating performance testing method includes: A sample is manufactured, the sample comprising a sample substrate and a sample coating covering the outer surface of the sample substrate, the outer surface of the sample comprising an outer peripheral surface, a first plane and a second plane, the outer peripheral surface and the second plane intersecting to form an edge, the edge being the same as the wedge angle of the cutting edge of the tool, the tool comprising a tool substrate and a tool coating covering the outer surface of the tool substrate, the material of the tool substrate being the same as the material of the sample substrate, and the material of the tool coating being the same as the material of the sample coating; The edges and corners were subjected to a brushing test; Perform a scratch test or an indentation test on the first plane.

6. The method for testing the performance of tool coatings according to claim 5, characterized in that, The manufacturing of the sample includes the following steps: The sample substrate and the tool substrate are placed in the same coating preparation equipment. Under the same coating preparation environment, the sample coating covers the surface of the sample substrate, and the tool coating covers the surface of the tool substrate.

7. The method for testing the performance of tool coatings according to claim 5, characterized in that, The manufactured sample includes: A portion of a circular shaft is removed to obtain an intermediate body, the intermediate body comprising a first part and a second part connected to each other, the cross-sectional area of ​​the first part being smaller than that of the second part, the first part having a transition plane, the normal of the transition plane being perpendicular to the central axis of the circular shaft; A portion of the first part is removed to obtain the second base plane, and the remaining portion of the transition plane serves as the first base plane; The sample coating is applied to cover the first base surface to form the first plane, and the sample coating is applied to cover the second base surface to form the second plane.

8. The method for testing the performance of tool coatings according to claim 7, characterized in that, The central axis of the sample matrix is ​​located on the first base surface, the first base surface is parallel to the second base surface, and the first base surface and the second base surface are arranged sequentially along the inner normal direction of the transition plane. Removing a portion of the first part to obtain the second base surface includes: One end of the first part is ground to a depth of H, the radius of the circular shaft is R, and the angle of the corner is α, satisfying: H=Rsin(π / 2-α).

9. The method for testing the performance of tool coatings according to claim 7, characterized in that, The cutting diameter of the cutting tool is the same as the diameter of the circular shaft.

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