A method for preparing a surface performance test sample

Abstract

The present invention discloses a method for preparing a surface property test specimen, comprising the following steps: an inlaying step, wherein an inlay mold is used to prepare an inlay specimen in which a test specimen is inlaid in an inlay material, wherein the inlay specimen has a first end face, a second end face, and at least one straight lateral end face, wherein the first end face is parallel to the second end face, the lateral end face is perpendicular to the second end face, and the center line of the test specimen is parallel to the lateral end face; a cutting step, wherein the lateral end face is used as a base face, and the inlay specimen is cut along the center line of the test specimen parallel to the base face, wherein the cut surface of the inlay specimen remains parallel to the lateral end face; and a grinding and polishing step, wherein the lateral end face is used as a base face, and the inlay specimen is positioned in a grinding and polishing fixture, and the cut surface of the inlay specimen is ground and polished. The cutting, grinding and polishing steps of the test specimen can be completed by a single inlay, thereby avoiding damage to the test specimen due to secondary inlaying and improving test accuracy and efficiency.

Description

Technical Field

[0001] The invention is used in the field of product testing, and particularly relates to a method for preparing a surface performance testing sample. Background Art

[0002] Screws, bolts, and other fasteners are widely used in daily industry and life, especially in the automotive industry. It's worth noting that vehicles operate in a wide variety of driving environments, placing high demands on the corrosion resistance of screws and bolts exposed to the atmosphere. To prevent corrosion and fracture and ensure driving safety, screws and bolts are either made of stainless steel or protected by coating or painting. On the other hand, some screws and bolts require a high surface hardness to maintain strength and a core with good toughness to resist fracture and failure. These surfaces are then strengthened through heat treatments such as carburizing and induction hardening. From an automotive safety development perspective, the thickness and protective properties of the coating on screws and bolts, as well as the thickness and strength of the reinforcement layer, must be verified before use.

[0003] Currently, the coating thickness, surface reinforcement layer thickness, and strength are generally measured using the cross-section method (metallographic observation is used for the coating, and metallographic observation and hardness measurement can be used for the reinforcement layer). This involves cutting the screw or bolt axially to test the coating or reinforcement layer thickness on the surface of the thread. However, due to the small size and shape of small screws and bolts, fasteners are not conducive to clamping and cutting. Currently, the screws and bolts are generally hot-mounted in a metallographic mounting machine. After cooling and removal, the fastener is cut axially. The resin sample is then broken, and the mounted half is removed. The second cross-section is placed downward in the metallographic mounting machine for mounting. After cooling and removal, it is polished. Finally, the coating and reinforcement layer thickness on the surface of the thread are observed and measured after etching.

[0004] This method currently has the following drawbacks: 1. It requires two hot-mounting passes. Currently, hot-mounting molds used in metal inlay machines are all circular. After axial incision, the sides are curved, making it difficult to accurately locate the cut surface and perform hardness testing. Therefore, a second hot-mounting pass is required, wasting time. 2. The second hot-mounting pass requires the sample to be broken. After the first inlay, the thermosetting resin is difficult to break, making fastener removal difficult. Physical removal, typically performed by hammering or squeezing, can damage the mounted component and cause flying debris, posing a significant risk. 3. Precise cutting is not possible. Currently, metallographic mounting materials are primarily black, opaque phenolic resins. After inlaying, the exact state of the screws or bolts being mounted cannot be observed. During cutting, the exact location of the axial center section of the screw or bolt cannot be determined, leading to the possibility of off-center cutting. The thickness of the coating and strengthening layer in sections not near the axial center section will be greater than the actual value. 4. Precise grinding and polishing are not possible. The metallographic inlay material uses black opaque phenolic resin, and it is impossible to determine whether it is ground to the axial center plane of the screw or bolt. If it deviates from the axial center section, the measured thickness of the coating and strengthening layer will be larger than the actual thickness. Summary of the Invention

[0005] The purpose of the present invention is to solve at least one of the technical problems existing in the prior art and to provide a method for preparing a surface property test sample, in which the cutting, grinding and polishing steps of the test sample can be completed by a single inlay, thereby avoiding damage to the test sample due to secondary inlay, and improving the test accuracy and efficiency.

[0006] The technical solution adopted by the present invention to solve its technical problem is:

[0007] A method for preparing a surface property testing sample comprises the following steps:

[0008] an inlaying step, using an inlay mold to produce an inlay sample by inlaying the test sample in an inlay material, wherein the inlay sample has a first end face, a second end face, and at least one straight lateral end face, wherein the first end face is parallel to the second end face, the lateral end face is perpendicular to the second end face, and the center line of the test sample is parallel to the lateral end face;

[0009] a cutting step, using the lateral end surface as a base surface, cutting the mounted sample along a center line of the test sample parallel to the base surface, wherein the cut surface of the mounted sample remains parallel to the lateral end surface;

[0010] In the grinding and polishing step, the lateral end surface is used as a base surface, the mounted sample is positioned on a grinding and polishing fixture, and the cut surface of the mounted sample is ground and polished.

[0011] In some embodiments, the inlay mold has a mold channel that passes through from top to bottom, and an upper pressure head and a lower pressure head are provided in the mold channel. The mold channel defines a mold cavity between the upper pressure head and the lower pressure head, and the upper pressure head has a first pressing surface forming the first end face, and the lower pressure head has a second pressing surface forming the second end face. The mold channel has at least one flat lateral cavity surface. In the inlay step, the test sample is placed in the mold cavity of the inlay mold, and the test sample stands parallel to the lateral cavity surface between the first pressing surface and the second pressing surface. Inlay material is added to the mold cavity, and the inlay material is cured and formed to obtain the inlay sample.

[0012] In some embodiments, the pressing head is magnetic and can hold the test sample upright in the mold cavity by magnetic force.

[0013] In some embodiments, if the test sample does not have a straight end surface capable of standing upright on the second pressing surface, a straight end surface is first processed on the end of the test sample before the test sample is placed in the mold cavity of the insert mold.

[0014] In some embodiments, during the inlay step, the upper press head is removed, the lower press head is raised along the mold channel, the test sample head is placed upright on the second pressing surface of the lower press head with the head facing downward, the lower press head is lowered into the mold cavity, the inlay material is added according to the height of the test sample, the upper press head is placed, the inlay material is heated and pressurized to solidify and form, the upper press head is removed, and the solidified inlay sample is ejected along the mold channel with the lower press head.

[0015] In some embodiments, the inlay material is made of light-transmitting resin particles.

[0016] In some embodiments, an auxiliary fixture is used to cut and position the embedded sample in the cutting step, and the auxiliary fixture includes a cutting platform, and the cutting platform is provided with a slide rail, and the slide rail is provided with a first clamping component and a second clamping component, and the first clamping component is provided with a clamping surface parallel to the cutting direction. In the cutting step, a cutting line is drawn on the first end face of the embedded sample, and the cutting line is parallel to the lateral end face and passes through the center position of the test sample. The embedded sample is clamped and positioned on the cutting platform by the first clamping component and the second clamping component, and the lateral end face of the embedded sample is made close to the clamping surface, and a cutting machine is used to cut according to the drawn cutting line.

[0017] In some embodiments, the cutting platform is provided with scales on both sides of the slide rail, the first clamping component has a slide seat that is in contact with the cutting platform, and the slide seat has a trailing edge parallel to the clamping surface. When the mounted sample is clamped and positioned, the trailing edge of the first clamping component is kept parallel to the cutting direction through the scales on both sides of the slide rail.

[0018] In some embodiments, the grinding and polishing fixture has a contoured groove that matches the shape of the mounted sample, and the bottom of the contoured groove is provided with a positioning surface. During the grinding and polishing step, the lateral end face of the mounted sample is inserted into the contoured groove with the lateral end face facing inward, and the lateral end face is tightly attached to the positioning surface, and then the cut surface of the mounted sample exposed outside the contoured groove is ground and polished.

[0019] In some embodiments, the polishing fixture includes a circular turntable, a driving handle is provided at the axis of the turntable, and a plurality of the contoured grooves are provided on the axial end face of the turntable, and the plurality of contoured grooves are distributed circumferentially around the driving handle.

[0020] One of the above technical solutions has at least one of the following advantages or beneficial effects: after the cut surface of the embedded sample is ground and polished, the preparation of the test sample is completed. At this time, the ground and polished screw and bolt test samples can be measured with a metallographic microscope or their surface properties can be measured using a hardness tester.

[0021] Among them, in the inlay step, an inlay sample with at least one straight lateral end face is directly produced by an inlay mold, and this lateral end face is used as a reference surface for subsequent operation steps such as cutting and grinding and polishing, eliminating the sampling and secondary inlay steps after cutting, which is more efficient and saves time and effort. During this process, there is no need to physically destroy the inlaid sample, which reduces the sampling process and does not damage the cross-section quality of the screws and bolts, and can better reflect the surface properties of the test sample. The above technical solution can complete the cutting, grinding and polishing steps of the test sample in one inlay, avoiding damage to the test sample due to secondary inlay, and greatly improving the test accuracy and efficiency.

[0022] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0024] Figure 1 is a flow chart of an embodiment of the present invention;

[0025] Figure 2A schematic structural diagram of an embodiment of a semicircular mosaic sample of the present invention;

[0026] Figure 3 A schematic structural diagram of an embodiment of a fan-shaped mosaic sample of the present invention;

[0027] Figure 4 A schematic structural diagram of an embodiment of a triangular mosaic sample of the present invention;

[0028] Figure 5 A schematic structural diagram of an embodiment of a rectangular mosaic sample of the present invention;

[0029] Figure 6 yes Figure 5 A side view of the structure of an embodiment shown;

[0030] Figure 7 yes Figure 5 A schematic diagram of a cutting line of an embodiment is shown;

[0031] Figure 8 yes Figure 5 A top view of one embodiment after cutting is shown;

[0032] Figure 9 yes Figure 5 A schematic diagram of a cut surface of an embodiment shown;

[0033] Figure 10 1 is a schematic structural diagram of an embodiment of the inlay mold of the present invention;

[0034] Figure 11 1 is a schematic structural diagram of an embodiment of the auxiliary clamp of the present invention;

[0035] Figure 12 It is a structural schematic diagram of an embodiment of the grinding and polishing fixture of the present invention. DETAILED DESCRIPTION

[0036] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it should not be understood as a limitation on the scope of protection of the present invention.

[0037] In the present invention, if directions (up, down, left, right, front and back) are described, it is only for the convenience of describing the technical solution of the present invention, and does not indicate or imply that the technical features referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it cannot be understood as a limitation of the present invention.

[0038] In the present invention, "several" means one or more, "multiple" means more than two, "greater than," "less than," "exceeds," etc. are understood to exclude the number itself; "above," "below," "within," etc. are understood to include the number itself. In the description of the present invention, the use of "first" or "second" is solely for the purpose of distinguishing technical features and is not to be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0039] In the present invention, unless otherwise expressly defined, terms such as "disposed," "installed," and "connected" should be interpreted broadly. For example, they may refer to direct connection or indirect connection through an intermediate medium; fixed connection or detachable connection or integral molding; mechanical connection or electrical connection or mutual communication; and internal connection between two components or interaction between two components. Those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0040] The embodiment of the present invention provides a method for preparing a surface performance test sample, which can be used for preparing surface performance test samples of small-sized parts such as screws and bolts, and further realizes the surface performance test of small-sized parts. The embodiment of the present invention takes screws as test samples as an example for explanation, see Figure 1 The method for preparing the surface performance test sample includes the following steps:

[0041] Inlay step, use the inlay mold to make the inlay sample of the screw inlay in the inlay material, see Figure 6 The main body of the inlaid sample 1 is formed by curing the inlaid material 11, and the screw 12 is embedded in the inlaid material 11. The inlaid sample 1 is directly formed by the inner cavity of the inlaid mold. The inlaid sample 1 has a first end face 13, a second end face 14 and at least one straight lateral end face 15. The inlaid sample 1 extends from the first end face 13 to the second end face 14 along the thickness direction. The first end face 13 is parallel to the second end face 14, and the lateral end face 15 is perpendicular to the second end face 14. Figure 2-Figure 5 The cross-sectional shape of the embedded sample 1 can be any shape with straight sides, such as a semicircle, a fan, a triangle, a rectangle, a hexagon, etc. The center line of the screw 12 embedded in the embedded sample 1 is parallel to the lateral end surface 15, and the lateral end surface 15 of the embedded sample serves as the base surface for sample cutting and testing.

[0042] Cutting steps, see Figure 7-Figure 9 , using the lateral end surface 15 as the base surface, find the center position of the screw 12, and cut the mounted sample along the center line of the screw 12 parallel to the base surface. The cutting surface 16 of the mounted sample 1 remains parallel to the lateral end surface 15;

[0043] During the grinding and polishing step, the mounted sample 1 is positioned in the grinding and polishing fixture 2, using the lateral end surface 15 as the base surface. The cut surface 16 of the mounted sample 1 is ground and polished, ultimately obtaining a smooth, scratch-free central cross-section of the screw. This allows subsequent measurements of the coating and strengthening layer thicknesses, as well as surface hardness, to be performed. For example, the surface properties of the ground and polished screw sample can be measured using a metallographic microscope or a hardness tester.

[0044] In an embodiment of the present invention, in the inlay step, an inlay sample having at least one straight lateral end face 15 is directly produced by an inlay mold, and this lateral end face 15 is used as a reference surface for subsequent operation steps such as cutting and grinding and polishing, thereby eliminating the sampling and secondary inlay steps after cutting, which is more efficient and saves time and effort. During this process, there is no need to physically destroy the inlaid sample, which reduces the sampling process, does not damage the cross-section quality of the screws and bolts, and can better reflect the surface properties of the test sample. The above technical solution can complete the cutting, grinding and polishing steps of the test sample in one inlay, avoids damage to the screws due to secondary inlay, and greatly improves the test accuracy and efficiency.

[0045] The inlay mold is used to inlay test samples such as screws in the cured inlay material, and the side of the inlay sample has at least one large straight-edge plane. The mold cavity can be any shape with straight edges, such as semicircular, fan-shaped, triangular, square, hexagonal, etc. Figure 10 The inlay mold 3 is made of mold steel that is not easy to rust or high-temperature resistant stainless steel. The inlay mold 3 has a mold channel 31 that runs through the upper and lower parts. An upper pressure head 32 and a lower pressure head 33 are provided in the mold channel 31. The mold channel 31 defines a mold cavity 34 between the upper pressure head 32 and the lower pressure head 33. The upper pressure head 32 has a first pressing surface 35 that forms the first end face 13, and the lower pressure head 33 has a second pressing surface 36 that forms the second end face 14. The mold channel 31 has at least one flat lateral cavity surface 37. In the inlay step, a screw is placed in the mold cavity 34 of the inlay mold 3. The screw stands parallel to the lateral cavity surface 37 between the first pressing surface 35 and the second pressing surface 36. Inlay material is added to the mold cavity 34, and the inlay material is cured and formed to obtain an inlay sample.

[0046] In some embodiments, in order to ensure that the screw remains upright and does not tilt under high temperature and high pressure environment, the pressing head 33 is magnetic. The pressing head 33 can keep the screw upright in the mold cavity 34 through magnetic force, thereby improving the qualified rate of embedding.

[0047] If the screw does not have a straight end surface that can stand upright on the second pressing surface 36 , a straight end surface is first processed on the end of the screw before the screw is placed in the mold cavity 34 of the insert mold 3 .

[0048] Specifically, during the inlaying step, the lid of the inlay mold 3 is opened, the upper pressure head 32 is connected to the lid, the upper pressure head 32 is removed, the lower pressure head 33 is connected to the hydraulic mechanism, and the lower pressure head 33 is raised along the mold channel 31. After the lower pressure head 33 is lifted into place, the screw head is placed upright on the second pressing surface 36 of the lower pressure head 33 with the screw head facing downward, and the lower pressure head 33 is lowered into the mold cavity 34. The inlay material is added according to the height of the screw, the upper pressure head 32 is placed, and the mold lid is tightened. Heat and pressure are applied to solidify the inlay material. After cooling, the lid of the inlay mold 3 is opened, the upper pressure head 32 is removed, and the lower pressure head 33 is used as a demoulding tool to eject the solidified inlay sample along the mold channel 31. Remove and observe whether the axis of the screws and bolts is parallel to the axis of the inlay sample. If they are parallel, they can be cut.

[0049] In the prior art, black, opaque phenolic resins are generally used as inlay materials. After inlaying, the specific state of the screws and bolts being inlaid cannot be observed. When cutting, the specific position of the axial center section of the screws and bolts cannot be determined, and the cutting may be off-center. The thickness of the coating and the strengthening layer of the section not near the axial center section will be larger than the actual value. Opaque phenolic resins cannot be accurately ground and polished as inlay materials. Metallographic inlay materials using black, opaque phenolic resins cannot determine whether they have been ground to the axial center plane of the screws and bolts. If they deviate from the axial center section, the measured coating and strengthening layer thickness will also be larger than the actual thickness. In an embodiment of the present invention, the inlay material uses translucent resin particles, such as polyvinyl chloride, urea-formaldehyde resin, modified acrylic resin, etc. By using visual inlay materials to make samples for testing the surface properties of screws and bolts, the inlaying, cutting, and grinding and polishing of the screws and bolts are visualized throughout the entire process, ensuring the accuracy of the cutting and grinding positions and improving the measurement accuracy of the coating and hardened layer thickness.

[0050] In some embodiments, in order to ensure that the cutting surface is parallel to the straight edge large plane and reduce manual cutting errors, an auxiliary fixture 4 is used to cut and position the mounted sample during the cutting step, see Figure 11The auxiliary clamp 4 includes a cutting platform 41, the cutting platform 41 is provided with a slide rail 42, and the slide rail 42 is provided with a first clamping component 43 and a second clamping component 44. The first clamping component 43 and the second clamping component 44 extend upward from the cutting platform 41 to a certain height. The first clamping component 43 and the second clamping component 44 can move left and right through the slide rail 42, and the first clamping component 43 and the second clamping component 44 are fixed to the cutting platform 41 using fasteners. The first clamping component 43 is provided with a clamping surface 45 parallel to the cutting direction. During the cutting step, a cutting line 46 is drawn on the first end face 13 of the mounted sample. The cutting line 46 is parallel to the lateral end face 15 and passes through the center position of the screw. The mounted sample is clamped and positioned on the cutting platform 41 by the first clamping component 43 and the second clamping component 44, and the lateral end face 15 of the mounted sample is tightly attached to the clamping surface 45 to ensure that the cutting surface remains parallel to the lateral end face 15. A cutting machine is used to cut according to the drawn cutting line 46. A water-cooled cutting machine can be used for cutting. Cutting is performed according to the drawn cutting line 46. The feed speed should be slow to prevent the screw from loosening and falling off.

[0051] For further information, see Figure 11 The cutting platform 41 is provided with scales 47 on both sides of the slide rail 42. The first clamping component 43 has a slide seat that fits with the cutting platform 41. The slide seat has a trailing edge parallel to the clamping surface 45. When the mounted sample is clamped and positioned, the trailing edge of the first clamping component 43 is kept parallel to the cutting direction through the scales 47 on both sides of the slide rail 42.

[0052] In some embodiments, see Figure 12 The grinding and polishing fixture 5 has a contoured groove 51 that matches the shape of the mounted sample. For example, if the mounted sample is rectangular, the grinding and polishing fixture 5 is provided with a rectangular groove. The bottom of the contoured groove 51 is provided with a positioning surface. During the grinding and polishing step, the lateral end face 15 of the mounted sample is inserted into the contoured groove 51 with the lateral end face 15 facing inward and closely contacting the positioning surface. The cut surface of the mounted sample exposed outside the contoured groove 51 is then ground and polished. During this process, different types of sandpaper are used for grinding and polishing, and polishing cloth is used for polishing. Finally, a smooth and scratch-free central cross-section of the screw or bolt is obtained, which is then used to measure the thickness of the coating and strengthening layer and the surface hardness.

[0053] Further, in order to improve the grinding efficiency, the following grinding and polishing fixture 5 is used for automatic grinding and polishing, see Figure 12 The polishing fixture 5 includes a circular turntable 52 with a drive handle 53 positioned at its axis. A plurality of contoured slots 51 are disposed on the axial end surface of the turntable 52, circumferentially surrounding the drive handle 53. After the mounted sample is mounted in the contoured slots 51, the drive handle 53 of the polishing fixture 5 is driven to rotate by a power system. Polishing is automatically performed during rotation, enabling automated batch polishing of samples and improving efficiency.

[0054] Throughout this specification, references to terms such as "example," "embodiment," or "some embodiments" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these 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 any one or more embodiments or examples.

[0055] Of course, the invention is not limited to the above-mentioned embodiments. Those skilled in the art may make equivalent modifications or substitutions without violating the spirit of the invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A method for preparing a surface property testing sample, characterized in that: The following steps are involved: an inlaying step, using an inlay mold to prepare an inlay sample for inlaying the test sample in an inlay material, wherein the test sample comprises a screw or a bolt, and the inlay sample has a first end face, a second end face, and at least one straight lateral end face, wherein the first end face is parallel to the second end face, the lateral end face is perpendicular to the second end face, and the center line of the test sample is parallel to the lateral end face; a cutting step, using the lateral end surface as a base surface, cutting the mounted sample along a center line of the test sample parallel to the base surface, wherein the cut surface of the mounted sample remains parallel to the lateral end surface; a grinding and polishing step, using the lateral end surface as a base surface, positioning the mounted sample in a grinding and polishing fixture, and grinding and polishing the cut surface of the mounted sample; The inlay mold has a mold channel that passes through from top to bottom, and an upper pressure head and a lower pressure head are provided in the mold channel. The mold channel defines a mold cavity between the upper pressure head and the lower pressure head. The upper pressure head has a first pressing surface that forms the first end face, and the lower pressure head has a second pressing surface that forms the second end face. The mold channel has at least one flat lateral cavity surface. In the inlay step, the test sample is placed in the mold cavity of the inlay mold, and the test sample stands between the first pressing surface and the second pressing surface parallel to the lateral cavity surface. Inlay material is added to the mold cavity, and the inlay material is cured and formed to obtain the inlay sample.

2. The method for preparing a surface property test sample according to claim 1, characterized in that: The pressing head is magnetic and can keep the test sample upright in the inner cavity of the mold by magnetic force.

3. The method for preparing a surface property testing sample according to claim 2, characterized in that: If the test sample does not have a straight end surface capable of standing upright on the second pressing surface, a straight end surface is first processed on the end of the test sample before the test sample is placed in the mold cavity of the insert mold.

4. The method for preparing a surface property testing sample according to claim 1, wherein: In the inlaying step, the upper press head is removed, the lower press head is raised along the mold channel, the test sample head is placed upright on the second pressing surface of the lower press head with the head facing downward, the lower press head is lowered into the mold cavity, the inlay material is added according to the height of the test sample, the upper press head is placed, the inlay material is heated and pressurized to solidify and form, the upper press head is removed, and the solidified inlay sample is ejected along the mold channel with the lower press head.

5. The method for preparing a surface property testing sample according to claim 1, wherein: The inlay material is made of light-transmitting resin particles.

6. The method for preparing a surface property testing sample according to claim 1, characterized in that: In the cutting step, an auxiliary fixture is used to cut and position the embedded sample. The auxiliary fixture includes a cutting platform, and the cutting platform is provided with a slide rail. The slide rail is provided with a first clamping component and a second clamping component. The first clamping component is provided with a clamping surface parallel to the cutting direction. In the cutting step, a cutting line is drawn on the first end surface of the embedded sample, and the cutting line is parallel to the lateral end surface and passes through the center position of the test sample. The embedded sample is clamped and positioned on the cutting platform by the first clamping component and the second clamping component, and the lateral end surface of the embedded sample is made close to the clamping surface. The cutting machine is used to cut according to the drawn cutting line.

7. The method for preparing a surface property testing sample according to claim 6, characterized in that: The cutting platform is provided with scales on both sides of the slide rail. The first clamping component has a slide seat that is in contact with the cutting platform. The slide seat has a trailing edge parallel to the clamping surface. When the mounted sample is clamped and positioned, the trailing edge of the first clamping component is kept parallel to the cutting direction through the scales on both sides of the slide rail.

8. The method for preparing a surface property testing sample according to claim 1, wherein: The grinding and polishing fixture has a contoured groove that matches the shape of the mounted sample, and the bottom of the contoured groove is provided with a positioning surface. In the grinding and polishing step, the lateral end surface of the mounted sample is placed inward into the contoured groove, and the lateral end surface is closely attached to the positioning surface. Then, the cut surface of the mounted sample exposed outside the contoured groove is ground and polished.

9. The method for preparing a surface property testing sample according to claim 8, characterized in that: The grinding and polishing fixture includes a circular turntable, a driving handle is provided at the axis of the turntable, and a plurality of the contoured grooves are provided on the axial end surface of the turntable. The plurality of contoured grooves are distributed circumferentially around the driving handle.

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