Self-adhesive coating silicon steel floating roller peel strength testing device and sample preparation method
By performing accurate shearing and nip end isolation of self-adhesive coating silicon steel material with the same dimensions, and using a controlled temperature heating plate and hydraulic device, an efficient and accurate sample preparation method for floating roller peel strength testing is achieved, and the solution is solved In the prior art, there are problems of low sample preparation efficiency and poor data consistency.
Patent Information
- Application Number
- CN202411432866.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-15
- Publication Date
- 2025-02-07
AI Technical Summary
The problem of low efficiency during the peeling and sample preparation process of self-adhesive coating floating rollers and poor consistency of test data.
By accurately shearing the material to be tested at the same size, all clamping ends are isolated, and using a controlled temperature heating plate and hydraulic device, multiple samples are prepared at one time to ensure stable control of pressure and temperature.
It significantly improves sample preparation efficiency and detection accuracy, realizes that sample preparation can be tested multiple times at a time, reduces the differential impacts during sample preparation, and is suitable for silicon steel materials of different thicknesses and strengths.
Smart Images
Figure CN119394904A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of metal surface coating and plating treatment, and in particular to a self-adhesive coating silicon steel floating roller peeling strength testing device and a sample preparation method. Background Art
[0002] Silicon steel is mainly used in the manufacture of iron cores in generators, motors, transformers and other fields. It is an important soft magnetic alloy that is indispensable in industries such as electronics, electricity, transportation and military. During use, users usually assemble the iron core by welding, bolting, self-fastening or riveting. However, welding and riveting can cause problems such as short circuit of the iron core, reduced insulation and deterioration of magnetic properties. In addition, the above fixing methods are all local point fixing, and the connection force is limited.
[0003] For high-speed motors such as new energy vehicle drive motors, ultra-high-speed wind turbines, and high-frequency vibration and hysteresis expansion components such as transformers, point connections between silicon steel sheets are subject to the risk of loosening and separation; the processing of micromotor cores is limited and it is difficult to perform riveting and welding. After the above process connection, there is a problem of heating at the fixed points during the operation of the motor, and the noise is loud during operation, which affects the performance of the motor.
[0004] Under this circumstance, traditional insulating coatings are difficult to meet the increasing requirements, and self-adhesive coatings have emerged, especially with the rapid development of thin-gauge silicon steel products. When the thickness of the silicon steel substrate is reduced to 0.30mm or below, the advantages of self-adhesive coatings are particularly obvious. Self-adhesive coatings have the advantages of high bonding strength, good punching performance, and excellent insulation performance. When in use, the silicon steel sheets are secondary cured through the self-adhesive coating, and the surface connection replaces the traditional point connection. The motor finally produced has the advantages of low loss, high efficiency, low vibration and low noise. It is a new type of silicon steel insulating coating with great potential.
[0005] The most critical technical parameter of silicon steel self-adhesive coating is peel strength, which can be tested by T peeling and floating roller peeling. Thin products are usually tested by floating roller peeling. During the test, sample preparation is time-consuming and labor-intensive, and its stability and consistency have a great impact on the test results. In addition, when using tooling, pressure springs, etc. to prepare samples, the pressure will continue to decrease as the coating shrinks during the bonding process, which will affect the test results. At the same time, a sample can only be tested once, and the data is not representative. If multiple samples are prepared, the operational differences in each sample preparation will be brought into the test results, affecting consistency.
[0006] At present, no patent technology related to the self-adhesive coating floating roller peeling sample preparation method has been published.
[0007] The present invention aims to solve the problems of low efficiency and poor consistency of test data in the process of floating roller peeling sample preparation for self-adhesive coating. A floating roller peeling sample preparation method with high efficiency and stable detection effect is provided. By accurately shearing the material to be tested to the same size and isolating all the clamping ends, multiple tests can be performed in one sample preparation. During the bonding process, as the coating is compressed, the pressure is continuously and stably controlled and will not decay, so that a sample prepared in accordance with the prescribed process is obtained, and the result is accurate. The device can set the pressure, temperature, and time within the commonly used range, without the need for specific tooling, and has a wide range of applicability. The method and device can be applied to floating roller peeling strength testing of oriented silicon steel, non-oriented silicon steel, and other thin plates coated with self-adhesive coatings of different thicknesses and strengths. Multiple tests can be performed in one sample preparation, which significantly improves the sample preparation efficiency and the accuracy of the test, and has a wide range of application. The method has been applied in mass production testing and laboratory development testing of thin-gauge fast self-adhesive silicon steel products, with excellent results. Summary of the invention
[0008] The purpose of the present invention is to solve the above problems and provide a self-adhesive coated silicon steel floating roller peeling strength testing device and a sample preparation method.
[0009] The object of the present invention is achieved as follows: A self-adhesive coated silicon steel floating roller peeling strength testing device comprises: a pressure controller, a hydraulic rod, a heating plate, a temperature controller, a base and a fixing assembly, wherein the pressure controller, the hydraulic rod, the heating plate and the temperature controller are all connected through electrical signals, the upper and lower heating plates are fixed through the base and the fixing assembly, the upper and lower heating plates are parallel to each other, and the upper heating plate can move freely in the vertical direction, the base is a cast iron part or a thick steel plate, the fixing assembly is four steel columns, the four steel columns are fixed on the base, holes are left at the four corners of the lower heating plate, the steel columns are passed through to fix it or directly fixed on the base, holes are left at the four corners of the upper heating plate, the steel columns are passed through to fix it in the horizontal direction and it can move freely in the vertical direction, a hydraulic rod is arranged above the upper heating plate, the hydraulic rod is fixed in the middle of the four steel columns, a steel bracket is added to the upper end of the steel column to connect the upper end of the hydraulic rod for fixing.
[0010] The sample preparation method for the peel strength test of the self-adhesive coated silicon steel floating roller includes the following steps: Step 1: Cut 5-15 samples from the clean and flat surface of the material to be tested, the sample width is 20-35mm, the length is 275-350mm, the size deviation of the same group of samples is less than 0.1mm, and the total height does not exceed 5mm; Step 2: Stack the samples neatly, and isolate the clamping end with isolation material. The length of the isolation section is 75-100mm, and the measuring section is 200-250mm; Step 3: Wrap the upper and lower sides of the stacked samples with isolation material to ensure neat stacking; Step Step 4: Preheat the heating plate according to the test requirements, and set the pressure required by the test at the same time. After the temperature reaches the test requirements, proceed to the next step; Step 5: Place the sample between the two preheated heating plates, clamp it under pressure, ensure that the entire measuring section is within the range of the heating plate, and start timing; Step 6: Take out the sample after the timing is over, and start testing after the sample cools down; Step 7: During the test, separate one sample piece at the isolation section at the clamping end, put it into the tensile machine fixture for testing, and after one test, continue to separate the second piece at the clamping end for testing, and so on, until the remaining unstretched sample bends and deforms during the test.
[0011] The beneficial effects of the present invention are as follows: the sample preparation method can obtain a sample that meets the specified process by accurately shearing the sample material, isolating the clamping end, and controlling the stable pressure and temperature, and can realize multiple tests with one sample preparation, without being affected by the differences in multiple sample preparations, and is efficient and accurate. The sample preparation efficiency is increased by 3-5 times.
[0012] The designed device uses a temperature-controlled heating plate, a hydraulic device, and other necessary bases, connectors, etc., which can set pressure, temperature, and time within the commonly used range without the need for specific tooling. It is suitable for floating roller peeling strength testing of oriented silicon steel, non-oriented silicon steel, and other thin plates coated with self-adhesive coatings of different thicknesses (0.1-0.65mm) and strengths. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] The present invention will be further described below in conjunction with the accompanying drawings.
[0014] Figure 1 It is a schematic structural diagram of the sample preparation device of the present invention.
[0015] Figure 2 This is a schematic diagram of the sample prepared by the present invention.
[0016] 1. Pressure controller; 2. Hydraulic rod; 3. Heating plate; 4. Temperature controller; 5. Base and fixing components; 6. Test section; 7. Clamping section. DETAILED DESCRIPTION
[0017] The present invention designs a sample preparation method for the peel strength test of a self-adhesive coated silicon steel floating roller, and designs a sample preparation method with wide applicability and simple operation. By accurately shearing the sample material, isolating the clamping end, and controlling the stable pressure and temperature, a sample that meets the specified process is obtained, and multiple tests can be performed once, without being affected by the differences in multiple sample preparations, and is efficient and accurate.
[0018] The device designed by the present invention adopts a temperature-controllable heating plate, in conjunction with a hydraulic device, and other necessary bases, connectors, etc., which can set pressure, temperature, and time within the commonly used range, without the need for specific tooling, and has a wide range of applicability. It covers the common self-adhesive coating bonding conditions in the current market, and the pressure is continuously adjusted during the sample preparation process as the coating is compressed. Compared with the use of fixed tooling, pressure springs, etc. for sample preparation, the pressure is stable throughout the process and is more in line with the specified test conditions. It is suitable for floating roller peeling strength testing of oriented silicon steel, non-oriented silicon steel, and other thin plates coated with self-adhesive coatings of different thicknesses (0.1-0.65mm) and strengths.
[0019] The sample preparation device designed by the present invention for the peeling strength test of the silicon steel floating roller of the self-adhesive coating comprises: (1) a base and a fixing assembly, which are used to fix and connect the upper and lower heating plates so that they are parallel to each other, and the upper heating plate can move freely in the vertical direction; (2) two upper and lower thickened digital display temperature control heating plates, which can accurately control the temperature, and the temperature control range is from room temperature to 400°C, with an accuracy of ±2°C; at the same time, it can withstand a pressure of 10MPa at 400°C without deformation. (3) A hydraulic rod fixedly connected to the base and connected to the upper electric heating plate at the moving end, with a pressure control system, which can provide a pressure of 0-10MPa with an accuracy of ±0.1MPa. The pressure controller and the hydraulic rod, the heating plate and the temperature controller are all connected and controlled by electrical signals. The base plays a supporting and fixing role, and does not need to be specially specified, and can be a cast iron part or a thick steel plate. The fixing assembly is four steel columns (tubes), which can be fixed to the base by welding, bolts, etc. Holes are left at the four corners of the lower heating plate, which are fixed through steel columns or directly fixed on the base; holes are left at the four corners of the upper heating plate, which are passed through steel columns to fix it horizontally and move freely vertically. A hydraulic rod is fixed above the upper heating plate, which is fixed at the center of the four steel columns. A steel plate bracket is added to the upper end of the steel column to connect the upper end of the hydraulic rod for fixing.
[0020] A method for preparing a sample for peel strength test of a self-adhesive coated silicon steel floating roller. The sample is wrapped with an isolation material to avoid adhesion to the paper sample equipment. The clamping ends are all separated by isolation materials. The temperature and pressure conditions of each sample are stable and uniform during the sample preparation process. The specific preparation process is as follows: (1) Cut multiple samples from the material to be tested with a clean and flat surface. The sample width is recommended to be 25±5mm and the length is 300mm or more. The dimensional deviation of the same group of samples should be better than 0.25mm. The number of samples should be more than 5, but the total height should not exceed 5mm; (2) Stack the samples neatly and use paper or other isolation materials to isolate the clamping end. For easy clamping, the length of the isolation section should be ≥75mm, and the measuring section should be ≥200mm; (3) Wrap the stacked samples with isolation materials on both sides to ensure neat stacking; (4) Preheat the heating plate according to the temperature required by the test, and set the pressure required by the test. After the temperature is reached, proceed to the next step; (5) Place the sample between the two preheated heating plates, clamp it under pressure, and ensure that the measuring section is all within the range of the heating plates, and start timing. (6) After the timing ends, quickly remove the sample and start testing after cooling. (7) During the test, separate one sample at the isolation section at the clamping end and place it in the tensile machine fixture for testing. After one test, you can continue to separate the second sample at the clamping end for testing, and so on, until the remaining parts are bent and deformed.
[0021] A preferred method for preparing a sample for the peel strength test of a self-adhesive coated silicon steel floating roller is to wrap the entire sample with an isolation material to avoid adhesion to the paper sample equipment; the clamping ends are all separated by isolation materials, and the temperature and pressure conditions of each sample are stable and uniform during the sample preparation process. The specific preparation process is as follows: (1) 5-10 samples are cut from the clean and flat surface of the material to be tested. The sample width is 25±2mm, the length is 320±5mm, the size deviation of the same group of samples is less than 0.1mm, and the total height is ≤3mm; (2) The samples are neatly stacked and the clamping ends are isolated with paper. For easy clamping, the length of the isolation section is 80mm and the measuring section is 240mm; (3) The stacked samples are wrapped with paper on both sides to ensure neat stacking; (4) The heating plate is preheated according to the test requirements, and the pressure required by the test is set at the same time. After the temperature is reached, proceed to the next step; (5) The sample is placed between the two preheated heating plates, clamped under pressure, and it should be ensured that the measuring section is entirely within the range of the heating plates, and the timing is started. (6) After the timing ends, quickly remove the sample and start testing after it cools down. (7) During the test, separate one sample piece at the isolation section of the clamping end and put it into the tensile machine fixture for testing. After one test, continue to separate the second piece at the clamping end for testing, and so on, until the remaining part is bent and deformed.
[0022] Different coating samples require different temperatures, pressures, and times. This method is a general test method and its content is not targeted at specific test samples. The current common coating test conditions range: temperature 180-320°C, pressure 2-5MPa, time 2-15 minutes. The specific parameters are determined according to the product, coating, and application conditions.
[0023] Compared with the prior art, the present invention has the following advantages: the sample preparation method has wide applicability and is easy to operate. By accurately shearing the sample material, isolating the clamping end, and controlling the stable pressure and temperature, a sample that meets the specified process can be obtained, which can achieve one-time sample preparation and multiple tests, without being affected by the differences during multiple sample preparations, and is efficient and accurate. The designed device adopts a temperature-controllable heating plate, a hydraulic device, and other necessary bases, connectors, etc., which can set the pressure, temperature, and time within the commonly used range without the need for specific tooling, and has a wide applicability. It covers the common self-adhesive coating bonding conditions in the current market. During the sample preparation process, the pressure is continuously adjusted as the coating is compressed. Compared with the use of fixed tooling, pressure springs, etc. for sample preparation, the pressure is stable throughout the process and is more in line with the specified test conditions. It is suitable for floating roller peeling strength testing of oriented silicon steel, non-oriented silicon steel and other thin plates coated with self-adhesive coatings of different thicknesses (0.1-0.65mm) and strengths. Example 1
[0024] 12 samples were cut from the 0.225mm thick oriented silicon steel material to be tested with a clean and flat surface coated with a quick self-adhesive coating. The sample width was 30mm and the length was 300mm. The length direction was perpendicular to the rolling direction of the coil. The size deviation of the same group of samples was less than 0.1mm, and the total height was 2.7mm. The samples were stacked neatly, and the clamping ends were isolated with paper. The length of the isolation section was 80mm and the measuring section was 220mm. The stacked samples were wrapped with paper on both sides and stacked neatly. The heating plate was preheated at the test required temperature of 260℃, and the test required pressure was set to 3MPa. After the temperature was reached, proceed to the next step. The sample was placed between the two preheated heating plates, clamped with 3MPa pressure, and the measuring section was ensured to be within the range of the heating plate, and the timing was started. After the 3min timing according to the test requirements, the sample was quickly taken out and the test was started after cooling to room temperature. During the test, separate a sample at the isolation section of the clamping end and put it into the tensile machine fixture for testing. After one test, continue to separate the second sample at the clamping end for testing, and so on. After 8 tests according to the test requirements, the remaining part will be slightly deformed, and the results of the first 7 times are valid. Example 2
[0025] Cut 10 samples from the non-oriented silicon steel material to be tested with a clean and flat surface coated with a quick self-adhesive coating and a thickness of 0.3mm. The sample width is 25mm and the length is 320mm. The length direction is perpendicular to the rolling direction of the coil. The size deviation of the same group of samples is less than 0.1mm, and the total height is 3.0mm. Stack the samples neatly, and use paper to isolate the clamping end. The length of the isolation section is 80mm and the measuring section is 240mm. The stacked samples are wrapped with paper on the upper and lower sides and stacked neatly. The heating plate is preheated at the test required temperature of 260℃, and the test required pressure is set to 3MPa. After the temperature is reached, proceed to the next step. Place the sample in the middle of the two preheated heating plates, clamp it with 3MPa pressure, ensure that the measuring section is all within the range of the heating plate, and start timing. After the 2min timing is completed according to the test requirements, quickly take out the sample, cool it to room temperature and start testing. During the test, separate one sample at the isolation section of the clamping end and put it into the clamp of the stretching machine for testing. After one test, continue to separate the second sample at the clamping end for testing, and so on. After testing 5 times according to the test requirements, if the remaining part does not deform, the 5 results are valid. Example 3
[0026] Cut 10 samples from the non-oriented silicon steel material to be tested with a clean and flat surface coated with a conventional self-adhesive coating and a thickness of 0.35mm. The sample width is 20mm and the length is 350mm. The length direction is perpendicular to the rolling direction of the coil. The size deviation of the same group of samples is less than 0.1mm, and the total height is 3.5mm. Stack the samples neatly, and use paper to isolate the clamping end. The length of the isolation section is 100mm and the measuring section is 250mm. Wrap the upper and lower sides of the stacked samples with paper and stack them neatly. Preheat the heating plate according to the test requirement temperature of 280℃, and set the test requirement pressure of 4MPa. After the temperature is reached, proceed to the next step; put the sample in the middle of the two preheated heating plates, clamp it with a pressure of 4MPa, ensure that the measuring section is all within the range of the heating plate, and start timing. After the 90min timing according to the test requirement is over, quickly take out the sample, cool it to room temperature and start testing. During the test, separate one sample at the isolation section of the clamping end and put it into the clamp of the stretching machine for testing. After one test, continue to separate the second sample at the clamping end for testing, and so on. After testing 5 times according to the test requirements, if the remaining part does not deform, the 5 results are valid. Comparative Example 1
[0027] Cut 5 groups of samples from the non-oriented silicon steel material to be tested with a clean and flat surface and a thickness of 0.3mm coated with a quick self-adhesive coating. Each group consists of 1 300×25mm sample and 8 250×25mm samples. The length direction is perpendicular to the rolling direction of the coil, and the size deviation of the same group of samples is less than 0.5mm. Align one end of each group of samples and stack them neatly. Wrap the upper and lower sides of the stacked samples with tin foil and stack them neatly. Preheat the heating plate according to the test requirement temperature of 260℃, and set the test requirement pressure of 3MPa. After the temperature is reached, proceed to the next step. Put one group of samples in the middle of the two preheated heating plates, clamp them with 3MPa pressure, ensure that the measuring section is all within the range of the heating plate, and start timing. After the timing of 2min according to the test requirement, quickly take out the sample, put in the second group of samples, start timing, and the second group of samples will cool naturally. And so on, complete the preparation of 5 groups of samples. During the test, the 300×25mm sample was bent and separated from the other samples by about 40mm, and placed in the tensile machine fixture for testing. Each group was tested once, and the remaining parts did not deform. The results of 5 times were valid. Comparative Example 2
[0028] Cut 10 samples from the non-oriented silicon steel material to be tested with a clean and flat surface coated with a conventional self-adhesive coating and a thickness of 0.35mm. The sample width is 20mm and the length is 350mm. The length direction is perpendicular to the rolling direction of the coil. The dimensional deviation of the same group of samples is less than 0.1mm. Stack the samples neatly, and use paper to isolate the clamping end. The length of the isolation section is 100mm and the measuring section is 250mm. The stacked samples are wrapped with paper on the upper and lower sides and stacked neatly. Put it into the tooling and pressurize it. When the pressure reaches the test requirement pressure of 4MPa, fix it, and then put it into a high-temperature box preheated at 280℃ according to the test requirement, and start timing. After the 90min timing is over according to the test requirement, take out the sample quickly. After cooling to room temperature, it is found that the sample in the tooling is compressed and the pressure has dropped to 3.2MPa. During the test, separate one sample at the isolation section of the clamping end and put it into the clamp of the stretching machine for testing. After one test, continue to separate the second sample at the clamping end for testing, and so on. After testing 5 times according to the test requirements, if the remaining part does not deform, the 5 results are valid.
[0029] The following table shows the results of floating roller peeling test of the samples prepared in Examples and Comparative Examples.
[0030]
[0031] It can be seen in the embodiments that the sample preparation method of the present invention is used to detect the peeling strength of the floating roller of the fast self-adhesive coating, and the standard deviation is less than 0.1; the peeling strength of the floating roller of the ordinary self-adhesive coating is detected, and the standard deviation is less than 0.15; the standard deviation of the conventional method (Comparative Example 1) is 0.25, and the tooling fixing method (Comparative Example 2) is used, because the pressure decreases with the compression of the coating, the test result is smaller, and the standard deviation is greater than 0.2.
[0032] At present, there are no related patents for the problem of self-adhesive coating peeling strength detection, and the present invention mainly relates to a sample preparation method and device for self-adhesive coating silicon steel floating roller peeling strength test. By accurately shearing the material to be tested to the same size and isolating all the clamping ends, one-time sample preparation and multiple tests can be achieved; during the bonding process, as the coating is compressed, the pressure is continuously and stably controlled and will not decay, so that the sample prepared in accordance with the prescribed process is obtained, and the result is accurate; the device can set the pressure, temperature, and time within the commonly used range, without the need for specific tooling, and has a wide range of applicability. It can be used for floating roller peeling strength testing of oriented silicon steel, non-oriented silicon steel and other thin plates coated with self-adhesive coatings of different thicknesses and strengths. The application of this method and device significantly improves the sample preparation efficiency and the accuracy of detection, and has a wide range of applications.
[0033] The above description is only a specific embodiment of the present invention, but the structural features of the protection scope of the present invention are not limited thereto. Any changes or modifications made by any technician in the field of the present invention are all covered by the patent scope of the present invention.
Claims
1. Self-adhesive coating silicon steel floating roller peeling strength test device, characterized by: include: The pressure controller, hydraulic rod, heating plate, temperature controller, base and fixing assembly are all connected through electrical signals. The upper and lower heating plates are fixed through the base and the fixing assembly. The upper and lower heating plates are parallel to each other, and the upper heating plate can move freely in the vertical direction. The base is a cast iron part or a thick steel plate. The fixing assembly is four steel columns, and the four steel columns are fixed on the base. Holes are left at the four corners of the lower heating plate, which are fixed through the steel columns or directly fixed on the base. Holes are left at the four corners of the upper heating plate, which are fixed through the steel columns to fix it in the horizontal direction and can move freely in the vertical direction. A hydraulic rod is arranged above the upper heating plate, and the hydraulic rod is fixed in the middle of the four steel columns. A steel bracket is added to the upper end of the steel column to connect the upper end of the hydraulic rod for fixing.
2. The method for preparing the sample for the peel strength test of the silicon steel floating roller with self-adhesive coating is characterized by: The following steps are involved: Step 1: Cut 5-15 samples from the clean and flat surface of the material to be tested. The width of the sample is 20-35mm, the length is 275-350mm, the size deviation of the same group of samples is less than 0.1mm, and the total height does not exceed 5mm; Step 2: Stack the samples neatly and isolate the clamping ends with isolation materials. The length of the isolation section is 75-100mm and the measuring section is 200-250mm. Step 3: Wrap the upper and lower sides of the folded samples with isolation materials to ensure they are neatly stacked; Step 4: Preheat the heating plate according to the test requirements and set the pressure required by the test. When the temperature reaches the test requirements, proceed to the next step; Step 5: Place the sample between two preheated heating plates, clamp it under pressure, make sure the entire measuring section is within the range of the heating plates, and start timing; Step 6: Take out the sample after the timing is over, and start testing after the sample cools down; Step 7: During the test, separate one sample piece at the isolation section of the clamping end and put it into the tensile machine fixture for testing. After one test, continue to separate the second piece at the clamping end for testing, and so on, until the remaining unstretched part of the sample bends and deforms during the test.