Manufacturing method of enameled wire metallographic section

Abstract

The invention relates to the technical field of wire manufacturing, in particular to a manufacturing method of an enameled wire metallographic section. The preparation method comprises the following steps: uniformly mixing acrylic powder and an acrylic curing agent according to a weight ratio of 1: 1 to obtain mixed resin; a straight to-be-detected enameled wire section is cut out, the enameled wire is cut in the axis direction of the enameled wire section, a section extending in the length direction of the enameled wire is obtained, the section presents the core wire trend and all paint film layer tangent planes, the cut enameled wire is vertically positioned in a mold, the mold is injected with the mixed resin, and the enameled wire is cut out. And curing and fixedly sealing the enameled wire section in the mold by using the mixed resin for 15-20 minutes, so as to obtain the enameled wire metallographic section.

Description

Technical Field

[0001] The invention relates to the technical field of electric wire manufacturing, and in particular to a method for manufacturing metallographic slices of enameled wires. Background Art

[0002] Enameled wire is mainly composed of two parts: metal conductor and insulating paint film. The insulating paint film is formed by baking the insulating paint after applying multiple thin layers of paint. The insulating paint has strong adhesion. In order to improve the production quality of enameled wire, the eccentricity of the first piece of enameled wire needs to be tested during the production process to control the qualified rate of the enameled wire.

[0003] In the process of detecting the eccentricity of the enameled wire, a metallographic section needs to be made. The metallographic section is to select a part of the enameled wire segment, then slice the enameled wire segment to expose the core wire and the paint film, and then wrap the slice with liquid resin, and then grind and polish it. However, there are still some shortcomings in the above-mentioned metallographic section making:

[0004] At present, the solidified liquid resin is prepared by mixing acrylic powder and acrylic curing agent, but the current ratio of acrylic powder to acrylic curing agent is 1:0.8, and the entire slicing curing process takes 40 minutes to 60 minutes, which is very unfavorable for the production efficiency of enameled wire production; and the obtained metallographic slices of enameled wire have many bubbles, which is not conducive to accurately observing the quality of the enameled wire. Summary of the invention

[0005] The purpose of the present invention is to avoid the shortcomings of the prior art and provide a method for preparing metallographic sections of enameled wires. The method can quickly prepare transparent, bubble-free metallographic sections of enameled wires and has the advantage of being easy to operate.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] Provided is a method for making metallographic sections of enameled wire, including:

[0008] Evenly mixing acrylic powder and acrylic curing agent, wherein the weight ratio of the acrylic powder to the acrylic curing agent is 1:1, to obtain a mixed resin;

[0009] Acrylic powder and acrylic curing agent are selected as raw materials, and the acrylic powder and the acrylic curing agent are evenly mixed to form a mixed resin, and the mixed resin is subsequently used to cure and shape the enameled wire segment to be tested.

[0010] Cut a straight enameled wire segment to be tested, cut the enameled wire along the axial direction of the enameled wire segment to obtain a cross section, the cross section extends along the length direction of the enameled wire segment, the cross section presents the direction of the core wire and the cross section of each paint film layer, and the cut enameled wire is vertically positioned in the mold.

[0011] When selecting the test object, try to select a straight enameled wire segment as much as possible, so that the eccentricity of the enameled wire and other problems can be observed more easily. Then cut the enameled wire along the axial direction of the enameled wire segment to obtain a cross section extending along the length direction of the enameled wire. The cross section shows the direction of the core wire and the cross section of each paint film layer, which is convenient for subsequent observation of the eccentricity of the core wire. By vertically positioning the enameled wire in the mold, the eccentricity of the core wire can be observed more intuitively.

[0012] The mixed resin is injected into the mold to seal the enameled wire segment in the mold. The curing time is 15 minutes to 20 minutes to obtain the metallographic section of the enameled wire.

[0013] Since the mold has a certain cavity, the corresponding metallographic section of the enameled wire can be quickly obtained by injecting the mixed resin into the mold. In addition, the metallographic section of the enameled wire can be quickly obtained by curing for 15 to 20 minutes.

[0014] When encapsulating enameled wire segments, a UV lamp is used to irradiate the mixed resin in the mold.

[0015] By irradiating with ultraviolet light, the curing speed of the mixed resin on the enameled wire can be further improved, and the production efficiency of the metallographic section of the enameled wire can be improved.

[0016] In some embodiments, the cut enameled wire segments are positioned in a metallographic clamp so that the enameled wire segments are placed vertically in the metallographic clamp, and the enameled wire segments positioned in the metallographic clamp are placed in the mold.

[0017] The metallographic clamp is a base that allows the enameled wire segment to be placed vertically for later observation. By using the metallographic clamp, it is easier to locate the enameled wire segment.

[0018] In some embodiments, when the acrylic powder and the acrylic curing agent are mixed uniformly, the acrylic powder and the acrylic curing agent are mixed in the same stirring direction until the mixed resin is crystal clear.

[0019] Since the formation of bubbles will greatly affect the observation of the enameled wire segment, therefore, by mixing the acrylic powder and the acrylic curing agent in the same stirring direction, the formation of bubbles can be further reduced, and the observation effect of the enameled wire segment can be further improved.

[0020] In some embodiments, sandpapers of different coarseness and fineness are used to grind the cured resin on the surface of the metallographic slice of the enameled wire to make the surface of the cured resin smooth.

[0021] Using sandpaper of different coarseness and fineness can better remove the different roughness of the metallographic sections of the enameled wire.

[0022] In some embodiments, when grinding, a metallographic grinder is used for grinding.

[0023] Grinding can be done by setting the sandpaper in a metallographic grinder.

[0024] In some embodiments, the ground solidified resin is polished to remove scratches caused by grinding.

[0025] Polishing the ground solidified resin again can further remove the scratches left by grinding, especially the tiny scratches, so as to obtain a smoother surface for better observation.

[0026] In some embodiments, the polished metallographic section of the enameled wire is placed under a metallographic microscope for observation.

[0027] Observe through a metallographic microscope.

[0028] In some embodiments, the metallographic microscope observes the eccentricity of the core wire, the thickness ratio of each paint film layer and / or the volume of each paint film layer on the metallographic section of the enameled wire.

[0029] Under magnification, the metallographic microscope can observe tiny structures, including the eccentricity of the core wire, and the corresponding thickness ratio of each paint film layer, so as to infer the influence of the paint film layer thickness on the eccentricity. By obtaining the volume data of each paint film layer, it can be known whether the amount of each layer is too much and affects the electrical performance of the enameled wire.

[0030] Beneficial effects of the method for making metallographic sections of enameled wires of the present invention:

[0031] The method for preparing the metallographic section of the enameled wire of the present invention adopts the method of uniformly mixing acrylic powder and acrylic curing agent, wherein the weight ratio of the acrylic powder to the acrylic curing agent is controlled to be 1:1, and the mixed resin is cured for 15 to 20 minutes when preparing the metallographic section of the enameled wire through the usage ratio of the acrylic powder to the acrylic curing agent, thereby greatly improving the production efficiency. In addition, since the method can be cured quickly in a short time, the generation of bubbles is effectively avoided, the transparency of the entire metallographic section of the enameled wire is improved, and the accuracy of detecting the quality of the enameled wire is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a structural schematic diagram of a metallographic section of an enameled wire according to an embodiment of the present invention.

[0033] Figure 2 It is a working state diagram of the metallographic section of the enameled wire irradiated by the ultraviolet lamp of the present invention.

[0034] Figure 3 The invention relates to a method for making metallographic slices of enameled wires.

[0035] Reference numerals

[0036] 1. Core wire; 2. Cross section; 3. Paint film layer 3. DETAILED DESCRIPTION

[0037] The preferred embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the preferred embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0038] The terms used in the present invention are only for the purpose of describing specific implementation regulations, and are not intended to limit the present invention. The singular forms "a", "the" used in the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used in this article refers to and includes any or all possible combinations of one or more associated listed items.

[0039] It should be understood that although the terms "first", "second", "third", etc. may be used to describe various information in the present invention, such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present invention, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0040] Example 1

[0041] Enameled wire is mainly composed of two parts: metal conductor and insulating paint film. The insulating paint film is formed by baking the insulating paint after applying multiple thin layers of paint. The insulating paint has strong adhesion. In order to improve the production quality of enameled wire, the eccentricity of the first piece of enameled wire needs to be tested during the production process to control the qualified rate of the enameled wire.

[0042] In the process of detecting the eccentricity of the enameled wire, a metallographic section needs to be made. The metallographic section is to select a part of the enameled wire segment, then slice the enameled wire segment to expose the core wire and the paint film, and then wrap the slice with liquid resin, and then grind and polish it. However, there are still some shortcomings in the above-mentioned metallographic section making:

[0043] At present, the solidified liquid resin is prepared by mixing acrylic powder and acrylic curing agent, but the current ratio of acrylic powder to acrylic curing agent is 1:0.8, and the entire slicing curing process takes 40 minutes to 60 minutes, which is very unfavorable for the production efficiency of enameled wire production; and the obtained metallographic slices of enameled wire have many bubbles, which is not conducive to accurately observing the quality of the enameled wire.

[0044] In view of this technical problem, this embodiment discloses a method for making metallographic sections of enameled wire, please refer to Figures 1-2 ,include:

[0045] Evenly mixing acrylic powder and acrylic curing agent, wherein the weight ratio of the acrylic powder to the acrylic curing agent is 1:1, to obtain a mixed resin;

[0046] Acrylic powder and acrylic curing agent are selected as raw materials, and the acrylic powder and the acrylic curing agent are evenly mixed to form a mixed resin, and the mixed resin is subsequently used to cure and shape the enameled wire segment to be tested.

[0047] Acrylic powder, also known as acrylate resin powder, is mainly composed of acrylate monomers, usually methyl methacrylate (MMA), and some additives.

[0048] Acrylic curing agent is a substance used to promote the polymerization reaction of monomers in acrylic powder. It can be a stable free radical compound such as AIBN (azobisisobutyronitrile) or MEKP (methyl ethyl ketone peroxide).

[0049] Cut a straight enameled wire segment to be tested, cut the enameled wire along the axial direction of the enameled wire segment, and obtain a cross section extending along the length direction of the enameled wire, the cross section presents the direction of the core wire and the cross section of each paint film layer, and vertically position the cut enameled wire in the mold.

[0050] When selecting the test object, try to select a straight enameled wire segment as much as possible, so that the eccentricity of the enameled wire and other problems can be observed more easily. Then cut the enameled wire along the axial direction of the enameled wire segment to obtain a cross section extending along the length direction of the enameled wire. The cross section shows the direction of the core wire and the cross section of each paint film layer, which is convenient for subsequent observation of the eccentricity of the core wire. By vertically positioning the enameled wire in the mold, the eccentricity of the core wire can be observed more intuitively.

[0051] Specifically, a straight enameled wire segment is selected as the inspection object because potential problems such as eccentricity are more easily observed in a straight wire segment.

[0052] Cut along the axis of the enameled wire segment to obtain a cross section extending along the length of the enameled wire. This step requires the use of sharp and precise tools, such as precision saws or cutters, to ensure the flatness and accuracy of the cross section.

[0053] The cut section will show the core line and the cut surface of each paint film layer. By observing these cut surfaces, the uniformity of the paint film layer and the degree of eccentricity of the core line can be evaluated.

[0054] Positioning the enameled wire vertically in the mold allows for a more intuitive observation of the eccentricity of the core wire. The mold should be designed to ensure that the enameled wire segment can be stably placed vertically for accurate observation.

[0055] Use a microscope or magnifying glass to observe the degree of eccentricity of the core wire. Specialized measuring tools, such as calipers or digital measuring instruments, can be used to measure the distance between the core wire and the paint film layer to determine the eccentricity. Record the observed data and measurement results for subsequent analysis. This data is essential for evaluating the quality of the enameled wire and can be used to improve the manufacturing process.

[0056] The mixed resin is injected into the mold, and the mixed resin is cured to seal the enameled wire segment in the mold. The curing time is 15 minutes to 20 minutes, and a metallographic section of the enameled wire is obtained.

[0057] Since the mold has a certain cavity, the corresponding metallographic slice of the enameled wire can be quickly obtained by injecting the mixed resin into the mold. The mold has a certain cavity, which makes it possible to quickly obtain the corresponding metallographic slice of the enameled wire after injecting the mixed resin into the mold, so that the resin is evenly distributed in the cavity to form the desired slice shape. In addition, the metallographic slice of the enameled wire can be quickly obtained by curing for 15min to 20min.

[0058] When the mixed resin is cured, an ultraviolet lamp is used to irradiate the mixed resin wrapped on the enameled wire in the mold.

[0059] By irradiating with ultraviolet light, the curing speed of the mixed resin on the enameled wire can be further improved, and the production efficiency of the metallographic section of the enameled wire can be improved.

[0060] In this embodiment, the cut enameled wire segments are positioned on the metallographic clamp so that the enameled wire segments are placed vertically in the metallographic clamp, and the enameled wire segments positioned on the metallographic clamp are placed in the mold.

[0061] The metallographic clamp is a base that allows the enameled wire segment to be placed vertically for later observation. By using the metallographic clamp, the enameled wire segment can be positioned more easily.

[0062] The metallographic clamp usually consists of a base and a clamping device. The base is designed to support the enameled wire segment so that it can be placed vertically. The clamping device is used to fix the enameled wire segment to ensure that it will not move during the curing and observation process. The cut enameled wire segment is accurately placed in the clamping device of the metallographic clamp to ensure that the enameled wire segment is vertically aligned with the base.

[0063] Adjust the clamping device so that it can firmly clamp the enameled wire segment while avoiding any damage to the enameled wire segment.

[0064] After the enameled wire segment is fixed in the metallographic clamp, the entire metallographic clamp together with the enameled wire segment is placed in a mold.

[0065] Make sure the mold cavity matches the cross-section of the enameled wire segment so that the mixed resin can evenly fill the cavity.

[0066] The mixed resin is injected into the cavity of the mold to cover the cross section of the enameled wire segment.

[0067] In this embodiment, when the acrylic powder and the acrylic curing agent are evenly mixed, the acrylic powder and the acrylic curing agent are mixed in the same stirring direction until the mixed resin is crystal clear.

[0068] Since the formation of bubbles will greatly affect the observation of the enameled wire segment, therefore, by mixing the acrylic powder and the acrylic curing agent in the same stirring direction, the formation of bubbles can be further reduced, and the observation effect of the enameled wire segment can be further improved.

[0069] After curing is completed, remove the metallographic clip and the enameled wire segment from the mold. Use a microscope or other observation equipment to observe the cross section of the enameled wire segment and analyze the eccentricity of the core wire and the uniformity of the paint film layer.

[0070] In this embodiment, sandpapers of different coarseness and fineness are used to grind the solidified resin on the surface of the metallographic slice of the enameled wire to make the surface of the solidified resin smooth.

[0071] Using sandpaper of different coarseness and fineness can better remove the different roughness of the metallographic sections of the enameled wire.

[0072] Specifically,

[0073] Mixing acrylic powder and acrylic hardener in the same stirring direction can help reduce the formation of bubbles. This is because the consistent stirring direction can reduce the shear force inside the material, thereby reducing the possibility of air being drawn into the mixture.

[0074] Using a stirring rod or a dedicated stirring device, stir the mixture in the same direction (clockwise or counterclockwise).

[0075] The stirring speed should not be too fast to avoid introducing too much air. A moderate stirring speed helps to evenly mix the acrylic powder and curing agent while reducing bubbles.

[0076] The stirring time should be long enough to ensure that the mixture is completely homogenous and until the mixed resin becomes crystal clear. This usually takes several minutes, depending on the amount of mixture and the efficiency of the stirring equipment.

[0077] During the stirring process, if bubbles are found to be formed, you can gently tap the wall of the container or use a defoamer to eliminate the bubbles.

[0078] Once you're done stirring, let the mixture sit for a while so that the bubbles can naturally rise to the surface and burst.

[0079] The crystal clear mixed resin can provide better light transmittance, which is essential for observing the internal structure of the enameled wire segment.

[0080] Reducing bubbles avoids the formation of opaque areas in the cured resin that could interfere with viewing the enameled wire segments.

[0081] Inject the well-mixed resin with fewer bubbles into the mold, and ensure that the enameled wire segments are correctly positioned.

[0082] After curing is complete, inspect the resin slice for bubbles or other defects. If present, you may need to re-prepare the resin and repeat the curing process.

[0083] By following the above steps and precautions, a high-quality mixed resin can be prepared, thereby improving the observation effect of the enameled wire segment and ensuring the accuracy of metallographic analysis.

[0084] In this embodiment, a metallographic grinder is used for grinding.

[0085] Grinding can be done by setting the sandpaper in a metallographic grinder.

[0086] Make sure the metallographic grinder is in good working condition and check whether the power supply and grinding disc are normal.

[0087] Select the appropriate sandpaper grit size based on the hardness of the enameled wire segment and the desired surface roughness. Typically, the grinding process starts with coarser sandpaper and gradually transitions to finer sandpaper. Secure the sandpaper to the grinding disc of the metallographic grinder. Make sure the sandpaper is flat and firmly secured to prevent movement or wrinkling during the grinding process. Place the enameled wire segment on the grinding disc, making sure it has good contact with the sandpaper.

[0088] Turn on the metallographic grinder and adjust the appropriate pressure and speed. Usually, use a lower pressure at the beginning and gradually increase the pressure as the grinding progresses. During the grinding process, add water or grinding fluid to reduce friction heat and avoid surface burns on the enameled wire segment. Water or grinding fluid also helps to wash away the debris generated by grinding, keep the sandpaper clean, and improve grinding efficiency.

[0089] After the rough grinding is completed, replace with finer sandpaper to gradually improve the surface smoothness of the enameled wire segment.

[0090] After grinding, use a soft brush or compressed air to remove debris and grinding fluid from the surface of the enameled wire segment.

[0091] Make sure the enameled wire segments are completely dry to avoid contamination during subsequent handling.

[0092] The ground solidified resin is polished to remove the scratches caused by grinding.

[0093] Polishing the cured resin after grinding can further remove the scratches after grinding, especially the tiny scratches, so as to obtain a smoother surface and facilitate observation. Make sure the polishing machine is in good working condition and check whether the power supply and polishing disc are normal.

[0094] Prepare a polishing liquid or paste, which usually contains fine abrasives such as aluminum oxide, cerium oxide, or diamond powder. Fix the polishing pad on the polishing disc of the polishing machine, making sure it is flat and firmly fixed. Place the cured resin sample on the polishing disc, making sure it is in good contact with the polishing pad. Turn on the polishing machine and adjust the appropriate pressure and speed. Generally, use lower pressure at the beginning and gradually increase the pressure as the polishing proceeds. During the polishing process, add a proper amount of polishing liquid or paste to keep the polishing pad wet and help remove scratches. The fine abrasives in the polishing liquid help smooth the surface and reduce scratches. Check the surface of the cured resin regularly to ensure that there are no new scratches or damage.

[0095] If you find that there are still scratches on the surface, you may need to change to a finer polishing liquid or adjust the polishing parameters.

[0096] In this embodiment, the metallographic section of the polished enameled wire is placed under a metallographic microscope for observation.

[0097] Observe through a metallographic microscope.

[0098] In this embodiment, the metallographic microscope is used to observe the eccentricity of the core wire, the thickness ratio of each paint film layer and / or the volume of each paint film layer on the metallographic slice cross section of the enameled wire.

[0099] Under magnification, the metallographic microscope can observe tiny structures, including the eccentricity of the core wire, and the corresponding thickness ratio of each paint film layer, so as to infer the influence of the paint film layer thickness on the eccentricity. By obtaining the volume data of each paint film layer, it can be known whether the amount of each layer is too much and affects the electrical performance of the enameled wire.

[0100] Observing the metallographic section of the polished enameled wire under a metallographic microscope is a common analytical method in the field of materials science and engineering to evaluate the microstructure and quality of the material.

[0101] The following are the steps for metallographic microscope observation:

[0102] Prepare the metallographic microscope: Make sure the metallographic microscope is calibrated and in good working condition.

[0103] Adjust the light source to ensure even lighting and appropriate brightness.

[0104] Sample placement: Place the polished enameled wire metal section on the stage of the microscope, making sure the sample is stable and does not move during observation. Use a low-power objective to perform preliminary focus and find the cross section of the enameled wire. Adjust the position of the stage so that the cross section is in the center of the field of view. Gradually switch to a higher-power objective to obtain a more detailed view of the microstructure. Finely adjust the focus until a clear image is obtained.

[0105] Carefully observe the core eccentricity of the enameled wire, etc. Use the microscope camera or video system to capture high-resolution images for subsequent analysis and documentation. Make sure the captured images include all important microscopic features.

[0106] Use the microscope's measuring tools to measure key features such as film thickness, core wire diameter, etc. Analyze the measurement results to assess whether the quality of the enameled wire meets manufacturing standards.

[0107] After the observation, use a soft cloth or a dedicated cleaning tool to clean the objective lens and stage of the metallographic microscope to avoid contamination. Organize the observation results and images into a report, including the quality assessment of the enameled wire and any recommended improvement measures.

[0108] Through observation under a metallographic microscope, the quality of the enameled wire can be accurately evaluated, which is crucial for product quality control and process optimization.

[0109] Example 2

[0110] For further instructions on how to operate and observe the eccentricity of the enameled wire, please refer to Figures 2-3 , specifically discloses the following embodiments:

[0111] Step 1: Sampling

[0112] According to specific needs, a specific cross-section of the enameled wire of appropriate size is cut. The cut sample needs to be flat, straight and without bends, and the metallographic sample needs to be representative.

[0113] Step 2: Sealing

[0114] The sample is mounted in the metallographic mounting clip. During this process, the sample must be perpendicular to the bottom surface and the sample must be free of bending. Then the metallographic mounting clip with the sample is gently placed in the mold with tweezers. In order to improve the metallographic curing efficiency, acrylic powder and acrylic curing agent are mixed in a 1:1 ratio, and then the mixed resin is fully and evenly stirred in the same direction to shorten the curing time, making the resin crystal clear and free of bubbles. Then the resin is gently poured along the mold, and the curing time is greatly reduced to 15-20 minutes.

[0115] Step 3: UV irradiation

[0116] In order to further improve the curing efficiency, the resin was placed under ultraviolet light, which increased the efficiency by 60% and obtained metallographic sections. This greatly facilitated the eccentricity detection of enameled wires, first-piece control, and failure analysis of competing products.

[0117] Step 4: Grinding

[0118] Take out the solidified metallographic slices and grind them carefully on a metallographic grinder using sandpaper of different coarseness and fineness to reduce the damage to the slices caused by sectioning and greatly improve the smoothness of the section. The surface of the slice is required to be ground to be flat, smooth and scratch-free.

[0119] Step 5: Polishing

[0120] Finally, the slices need to be carefully ground and polished on a metallographic grinder, and metallographic grinding fluid is added to the polishing disc to make the sample surface smoother. Polishing can eliminate the tiny scratches on the surface during the grinding process and provide a clear sample surface for subsequent observation under a metallographic microscope.

[0121] Step 6: Observation

[0122] The ground samples are placed under a metallographic microscope for observation, and the metallographic surface microstructure, eccentricity, bottom-to-surface ratio, and copper layer volume ratio are carefully analyzed. Based on the observed microstructure images, key information such as material and product defects are analyzed, providing important basis for product and material performance evaluation, process optimization, and failure analysis.

[0123] When the ratio of acrylic powder to acrylic curing agent is changed, the curing efficiency of metallographic section resin can be greatly improved. The experimental effectiveness is high and the operation is simple. It can greatly improve the efficiency of product analysis and provide a new idea for the eccentricity detection of enameled wire and the testing of related performances.

[0124] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps described in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0125] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0126] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0127] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0128] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for making metallographic sections of enameled wire, characterized in that: include: Evenly mixing acrylic powder and acrylic curing agent, wherein the weight ratio of the acrylic powder to the acrylic curing agent is 1:1, to obtain a mixed resin; Cut a straight enameled wire segment to be tested, cut the enameled wire along the axial direction of the enameled wire segment to obtain a cross section, the cross section extends along the length direction of the enameled wire segment, the cross section presents the direction of the core wire and the cross section of each paint film layer, and the cut enameled wire is vertically positioned in the mold. The mixed resin is injected into the mold to seal the enameled wire segment in the mold with the mixed resin. The curing time of the sealing is 15 minutes to 20 minutes, and a metallographic section of the enameled wire is obtained.

2. The method for making metallographic sections of enameled wire according to claim 1, characterized in that: When encapsulating enameled wire segments, a UV lamp is used to irradiate the mixed resin in the mold.

3. The method for making metallographic sections of enameled wire according to claim 1, characterized in that: The cut enameled wire segments are positioned on the metallographic clamps so that the enameled wire segments are placed vertically in the metallographic clamps, and the enameled wire segments positioned on the metallographic clamps are placed in the mold.

4. The method for making metallographic sections of enameled wire according to claim 1, characterized in that: When the acrylic powder and the acrylic curing agent are evenly mixed, the acrylic powder and the acrylic curing agent are mixed in the same stirring direction until the mixed resin is crystal clear.

5. The method for making metallographic sections of enameled wire according to claim 1, characterized in that: Sandpapers of different coarseness and fineness are used to grind the solidified resin on the surface of the metallographic slice of the enameled wire to make the surface of the solidified resin smooth.

6. The method for making metallographic sections of enameled wire according to claim 5, characterized in that: When grinding, use a metallographic grinder for grinding.

7. The method for making metallographic sections of enameled wire according to claim 6, characterized in that: The ground solidified resin is polished to remove the scratches caused by grinding.

8. The method for making metallographic sections of enameled wire according to claim 7, characterized in that: The metallographic section of the polished enameled wire is placed under a metallographic microscope for observation.

9. The method for making metallographic sections of enameled wire according to claim 8, characterized in that: The metallographic microscope is used to observe the eccentricity of the core wire on the metallographic slice section of the enameled wire.

10. The method for making metallographic sections of enameled wire according to claim 9, characterized in that: The metallographic microscope also observes the thickness ratio of each paint film layer and / or the volume of each paint film layer on the metallographic slice section of the enameled wire.

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