A PU polymer bonded grinding wheel and its preparation process

Abstract

The invention discloses a PU polymer-bonded grinding wheel and a preparation process thereof, which mainly comprises the following steps: selecting a basic abrasive material with excellent wear resistance and rigidity, mixing the PU polymer with a relevant solvent in proportion, adding a relevant catalyst, stirring evenly to obtain an adhesive, detecting the uniformity of the obtained adhesive mixture, extracting a part of the adhesive mixture as a detection sample, detecting the solid content in the detection sample solution, comparing the detected solid content data with a specified threshold value K, determining the uniformity of the adhesive mixture, stirring the adhesive prepared in step 2 evenly with the basic abrasive, pouring into a mold after stirring evenly, molding the same by heating and curing, grinding and polishing a plate by a grinding wheel, maintaining the grinding wheel after use, and ensuring the service life of the grinding wheel by cleaning the grinding wheel.

Description

Technical Field

[0001] The invention relates to the technical field of material preparation technology, and in particular to a PU polymer-bonded grinding wheel and a preparation technology thereof. Background Art

[0002] Grinding wheel is a device widely used in industrial grinding, mainly used in surface treatment, polishing, grinding and other fields. Traditional grinding wheels are usually made of rubber, synthetic resin and other materials, and have certain limitations in wear resistance, heat resistance, chemical corrosion resistance and other aspects.

[0003] The existing publication number is CN111941292A, which discloses a grinding wheel for grinding and a preparation process thereof. In the document, the weights of various raw materials are formulated in a percentage manner, and the materials have good compatibility and dispersibility, thereby improving the organizational structure of the grinding wheel, thereby improving the wear resistance and aging resistance of the grinding wheel.

[0004] However, the above-mentioned comparative document only mentions the process of how to make the grinding wheel. During this process, the uniformity of the prepared mixed liquid is not tested. If the mixed liquid is uneven, it will lead to an uneven ratio of polymer material and solvent, affecting the adhesion and curing effect of the adhesive itself, and will also directly affect the service life and grinding effect of the prepared grinding wheel. Summary of the invention

[0005] The object of the present invention is to provide a PU polymer bonded grinding wheel and a preparation process thereof, so as to solve the above-mentioned problem that after stirring the mixed liquid, if the mixed liquid is uneven, it will lead to an uneven ratio of the polymer material and the solvent, affecting the adhesion and curing effect of the adhesive itself, and will also directly affect the service life and grinding effect of the prepared grinding wheel.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A PU polymer bonded grinding wheel and a preparation process thereof, mainly comprising the following steps:

[0008] Step 1: Select the basic material;

[0009] Step 2: Mix the PU polymer with the solvent to obtain an adhesive mixture, and test the adhesive mixture obtained by the reaction. The specific method is as follows:

[0010] A1: Detect the uniformity of the prepared adhesive mixture;

[0011] A2: Detect the solid content of the prepared adhesive mixture;

[0012] A3: Extract part of the adhesive mixture as a test sample, divide the extracted part of the adhesive mixture into several groups of equal amounts of adhesive mixtures, and test the solid content of the several groups of equal amounts of adhesive mixtures;

[0013] A4: Sum and average the solid contents of several groups obtained in A3, and use the average value as the solid content frame value L1 of several groups of equal adhesive mixtures, and subtract the obtained solid content frame value from the solid content value in A2;

[0014] A5, subtract the solid contents of several groups obtained in A3 from the average value obtained in A4, sum up the obtained multiple groups of differences and take the average value, and use the average value as the difference frame number L2.

[0015] Step 3: evenly apply the adhesive prepared in step 2 on the base material, and dry it by heating and curing;

[0016] Step 4: Grinding the heated and cured base material using a grinding wheel;

[0017] Step 5: Maintain the grinding wheel after use by cleaning, drying and rust-proofing the grinding wheel to ensure its service life.

[0018] As a further solution of the present invention: in A2, part of the adhesive mixture is heated to volatilize the liquid in the adhesive mixture, and the remaining solid particles are weighed. The obtained data is the mass of the solid particles and is marked as T1. The solid content P in the part of the adhesive mixture is calculated using the formula, , T2 represents the total mass of the extracted adhesive mixture, and C is the preset proportional coefficient.

[0019] As a further solution of the present invention: In A4 and A5, the calculated solid content frame value L1 and the difference frame number L2 are substituted into the formula, and the formula is: , R represents the frame value for detecting the uniformity of the adhesive mixture, S represents the preset proportional coefficient, N represents the number of components of the extracted part of the adhesive mixture, and the uniformity frame value R of the adhesive mixture obtained by the formula is compared with the specified solid content threshold K. The specific implementation method is as follows:

[0020] B1: After comparing the measured solid content P with the specified solid content threshold K, the following situations are classified:

[0021] If the solid content P value is greater than the specified solid content threshold K, it is determined that the stirred adhesive mixture is not uniform;

[0022] If the solid content P value is less than or equal to the specified solid content threshold K, it is determined that the stirred adhesive mixture is uniform;

[0023] B2: The unevenly stirred adhesive mixture is further heated and stirred to achieve the uniformity standard of the adhesive mixture.

[0024] As a further solution of the present invention: in B2, the solid content of the heated and stirred adhesive mixture is detected, and the solid particle size ai, the solid particle mass bi and the solid particle number ci are detected and evaluated. The measured data of the solid particle size ai, the solid particle mass bi and the solid particle number ci are respectively brought into the formula to obtain the solid content frame value Pi of the heated and stirred adhesive mixture. , α and β are used as preset proportional coefficients. By comparing the obtained Pi solid content frame value with the solid content threshold K in step B1, the optimal temperature and optimal heating time in the heating and stirring process are determined under different temperatures and different heating times.

[0025] As a further solution of the present invention: by recording different times of heating and stirring the non-uniform adhesive mixture at the same temperature, and by recording different temperatures of heating and stirring the non-uniform adhesive mixture under the same heating time, several portions of the adhesive mixture heated and stirred in the above manner are respectively extracted, and the solid content P of the several portions of the adhesive mixture is calculated by the formula in the above method B2, and the solid content P of the several portions of the extracted adhesive mixture is evaluated, and on the basis of the evaluation of the solid content P, the influence of the temperature and heating time on the non-uniform adhesive mixture when heating and stirring is detected. The specific implementation method is as follows:

[0026] At the same temperature, the solid content P of multiple groups of adhesive mixtures is evaluated, and the heating time is recorded to obtain the heating time of the adhesive mixture with a qualified solid content P after heating and stirring. The heating time of multiple groups is summed and averaged, and the average value is used to determine the optimal heating time threshold;

[0027] At the same time, by evaluating the solid content P of multiple groups of adhesive mixtures and recording the heating temperatures of different components, the heating temperatures of multiple groups of adhesive mixtures with qualified solid content after heating and stirring are obtained, the multiple groups of heating temperatures are summed and averaged, and the average value is used to determine the optimal heating temperature threshold.

[0028] As a further solution of the present invention: a PU polymer bonded grinding wheel and its preparation process, the surface uniformity quality inspection of the base material after grinding in step 4 is carried out, and the specific implementation method is as follows:

[0029] S1: Record the grinding time Tm and grinding pressure Qm of each base material;

[0030] S2: Test each base material after grinding and use the formula , W represents the detection frame value of each base material, D is the error proportional coefficient, and the detection frame value W obtained by calculation is used as the judgment value of each base material after grinding;

[0031] S3: replacing the insufficiently ground base material with a grinding wheel of a different specification and type for further grinding, performing the coating treatment in step 2 on the overly ground base material, and then grinding the coated base material;

[0032] S4: Performing surface inspection in S2 on the further ground base material; during the grinding of the coated base material, adjusting the grinding time.

[0033] As a further solution of the present invention: in S2, the calculated detection frame value W is compared with the specified value range (R1, R2):

[0034] If the base material detection frame value W is within the specified value range (R1, R2), it is determined that the base material is ground evenly;

[0035] If the basic material detection frame value W does not exist in the specified value range (R1, R2), then compare the basic material detection frame value W with R1 and R2;

[0036] If W is greater than R2, it is determined that the base material is not ground sufficiently;

[0037] If W is less than or equal to R1, it is determined that the base material is ground too sufficiently.

[0038] As a further scheme of the present invention: in S3, ultrasonic waves are used to detect the surface of the base material after the grinding process, and the rebound time To after the ultrasonic waves hit the surface of the base material is detected and statistics are obtained, o represents the rebound time of different groups of ultrasonic waves contacting the surface of the base material, and the formula is used to sum and take the average value Ty, Ty is used as the representative value of the detection rebound time, and multiple groups of evenly ground base materials are subjected to ultrasonic testing, and the rebound time Tl is recorded, l represents different groups of evenly ground base materials, and the formula is used to sum and take the average value Tq, and the obtained average value Tq is used as the threshold value for uniform grinding.

[0039] As a further solution of the present invention: by comparing the detection rebound time representative value Ty with the grinding uniformity threshold value Tq, the analysis and determination are as follows:

[0040] If the measured Tq value is less than or equal to the Ty value, it is determined that the standard material after the re-grinding process is qualified;

[0041] If the measured Tq value is greater than the Ty value, it is determined that the standard material after the re-grinding process is unqualified.

[0042] As a further solution of the present invention: the PU polymer bonded grinding wheel is made according to the above-mentioned preparation process.

[0043] Beneficial effects of the present invention:

[0044] (1) The present invention mixes PU polymer and relevant solvent in proportion, adds relevant catalyst, and stirs to obtain adhesive. The uniformity of the obtained adhesive mixture is tested, and a part of the adhesive mixture is extracted as a test sample. The solid content in the test sample solution is tested, and a part of the adhesive mixture is heated to volatilize the liquid in the adhesive mixture. The remaining solid particles are weighed, and the obtained data is the mass of the solid particles, which is marked as T1. The solid content P in the part of the adhesive mixture is calculated using the formula, T2 represents the total mass of the extracted part of the adhesive mixture, C is a preset proportional coefficient, and the test sample solution is tested. The solid content data after the mixing is compared with the specified threshold value K to determine the uniformity of the adhesive mixture. In A3, the solid content P measured by the formula is compared with the specified solid content threshold value K. After comparing the measured solid content P with the specified solid content threshold value K, the unevenly stirred adhesive mixture is heated and stirred again to make it reach the uniformity standard of the adhesive mixture, so as to avoid the uneven proportion of the polymer material and the solvent in the case of uneven mixed liquid, which affects the adhesion and curing effect of the adhesive itself, and also directly affects the service life and grinding effect of the obtained grinding wheel.

[0045] (2) The present invention performs a quality inspection on the surface uniformity of the ground base material, records the grinding time Tm and grinding pressure Qm of each base material, where m represents each base material, and inspects each ground base material. The formula , W represents the detection frame value of each base material, D is the error proportional coefficient, the detection frame value W obtained by calculation is used as the judgment value for each base material after grinding, and the detection frame value W obtained by calculation is compared with the specified value range (R1, R2), and the base material that is not ground sufficiently is replaced with a grinding wheel of different specifications and types for further grinding, and the base material that is ground too sufficiently is subjected to the smearing treatment in step 2, and then the smeared base material is ground, and the surface inspection in S2 is performed on the base material after further grinding. In the process of grinding the smeared base material, the grinding time is adjusted. By adjusting the reasonable grinding time and grinding pressure, not only can the wear of the grinding wheel be avoided, but also the smoothness and flatness of the grinding surface can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] The present invention will be further described below in conjunction with the accompanying drawings.

[0047] Figure 1 It is a process flow chart of the present invention;

[0048] Figure 2 This is a diagram obtained by detecting uniformity of adhesive according to the present invention;

[0049] Figure 3 It is a diagram of the steps of detecting the surface uniformity of the ground base material according to the present invention. DETAILED DESCRIPTION

[0050] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0051] Embodiment 1

[0052] See also Figure 1-Figure 3 As shown, the present invention is a PU polymer bonded grinding wheel and a preparation process thereof, which mainly includes the following steps:

[0053] Step 1: Select the basic material;

[0054] Step 2: Mix the PU polymer with the relevant solvent to obtain an adhesive mixture, and test the adhesive mixture obtained by the reaction. The specific method is as follows:

[0055] A1: Detect the uniformity of the prepared adhesive mixture;

[0056] A2: Detect the solid content of the prepared adhesive mixture;

[0057] A3: Extract part of the adhesive mixture as a test sample, divide the extracted part of the adhesive mixture into several groups of equal amounts of adhesive mixtures, and test the solid content of the several groups of equal amounts of adhesive mixtures;

[0058] A4: Sum and average the solid contents of several groups obtained in A3, and use the average value as the solid content frame value L1 of several groups of equal adhesive mixtures, and subtract the obtained solid content frame value from the solid content value in A2;

[0059] A5, subtract the solid contents of several groups obtained in A3 from the average value obtained in A4, sum up the obtained multiple groups of differences and take the average value, and use the average value as the difference frame number L2.

[0060] In A4 and A5, the calculated solid content frame value L1 and the difference frame number L2 are substituted into the formula, and the formula is: , R represents the frame value for detecting the uniformity of the adhesive mixture, S represents the preset proportional coefficient, N represents the number of components of the extracted part of the adhesive mixture, and the uniformity frame value R of the adhesive mixture obtained by the formula is compared with the specified solid content threshold K. The specific implementation method is as follows:

[0061] B1: After comparing the measured solid content P with the specified solid content threshold K, the following situations are classified:

[0062] If the solid content P value is greater than the specified solid content threshold K, it is determined that the stirred adhesive mixture is not uniform;

[0063] If the solid content P value is less than or equal to the specified solid content threshold K, it is determined that the stirred adhesive mixture is uniform;

[0064] B2: The unevenly stirred adhesive mixture is heated and stirred to achieve the uniformity standard of the adhesive mixture. The specific implementation method is as follows:

[0065] In B2, the solid content of the adhesive mixture after heating and stirring is tested and evaluated from three aspects: solid particle size ai, solid particle mass bi and solid particle number ci. The measured data of solid particle size ai, solid particle mass bi and solid particle number ci are respectively used in the formula to obtain the solid content frame value Pi of the adhesive mixture after heating and stirring. , α and β are used as preset proportional coefficients, and the obtained Pi is compared with the solid content threshold K to determine the optimal temperature and optimal heating time in the heating and stirring process under different temperatures and different heating times;

[0066] By recording different times of heating and stirring the uneven adhesive mixture at the same temperature, and by recording different temperatures of heating and stirring the uneven adhesive mixture under the same heating time, several portions of the adhesive mixture after heating and stirring in the above manner are respectively extracted, and the solid content P of the several portions of the adhesive mixture is calculated by the formula using the method in B2 above, and the solid content P of the several portions of the extracted adhesive mixture is evaluated. Based on the evaluation of the solid content P, the influence of the temperature and heating time on the uneven adhesive mixture during heating and stirring is detected. The specific implementation method is as follows:

[0067] At the same temperature, the solid content P of multiple groups of adhesive mixtures is evaluated, and the heating time is recorded to obtain the heating time of the adhesive mixture with a qualified solid content P after heating and stirring. The heating time of multiple groups is summed and averaged, and the average value is used to determine the optimal heating time threshold;

[0068] At the same time, by evaluating the solid content P of multiple groups of adhesive mixtures and recording the heating temperatures of different components, the heating temperatures of multiple groups of adhesive mixtures with qualified solid content after heating and stirring are obtained, the multiple groups of heating temperatures are summed and averaged, and the average value is used to determine the optimal heating temperature threshold.

[0069] Step 3: evenly apply the adhesive prepared in step 2 on the base material, and dry it by heating and curing;

[0070] Step 4: Grinding the heated and cured base material using a grinding wheel;

[0071] Embodiment 2

[0072] like Figure 3 As shown, the surface uniformity quality inspection is performed on the base material after grinding in step 4, and the specific implementation method is as follows:

[0073] S1: Record the grinding time Tm and grinding pressure Qm for each base material, where m represents each base material, m=1, 2, 3, ..., n;

[0074] S2: Test each base material after grinding and use the formula , W represents the detection frame value of each base material, D is the error proportional coefficient, and the detection frame value W obtained by calculation is used as the judgment value of each base material after grinding;

[0075] In S2, the calculated detection frame value W is compared with the specified value range (R1, R2):

[0076] If the base material detection frame value W is within the specified value range (R1, R2), it is determined that the base material is ground evenly;

[0077] If the basic material detection frame value W does not exist in the specified value range (R1, R2), then compare the basic material detection frame value W with R1 and R2;

[0078] If W is greater than R2, it is determined that the base material is not ground sufficiently;

[0079] If W is less than or equal to R1, it is determined that the base material is ground too sufficiently.

[0080] S3: replacing the insufficiently ground base material with a grinding wheel of a different specification and type for further grinding, performing the coating treatment in step 2 on the overly ground base material, and then grinding the coated base material;

[0081] S4: performing surface inspection in S2 on the further ground base material; during the grinding of the coated base material, adjusting the grinding time;

[0082] Step 5: Maintain the grinding wheel after use by cleaning, drying and rust-proofing the grinding wheel to ensure its service life.

[0083] In S3, ultrasonic waves are used to detect the surface of the ground base material, and the rebound time To after the ultrasonic wave hits the surface of the base material is statistically analyzed, where o represents the rebound time of different groups of ultrasonic waves contacting the surface of the base material, o=1, 2, 3, ..., n, and the average value Ty is obtained by summing up the formula. Ty is used as the representative value of the detection rebound time. Multiple groups of evenly ground base materials are subjected to ultrasonic testing, and the rebound time Tl is recorded. l represents different groups of evenly ground base materials, l=1, 2, 3, ... n, and the average value Tq is obtained by summing up the formula. The obtained average value Tq is used as the threshold value of even grinding. By comparing the representative value of the detection rebound time Ty with the threshold value of even grinding Tq, the analysis and judgment are as follows:

[0084] If the measured Tq value is less than or equal to the Ty value, it is determined that the standard material after the re-grinding process is qualified;

[0085] If the measured Tq value is greater than the Ty value, it is determined that the standard material after the re-grinding process is unqualified.

[0086] The working principle of the present invention is as follows: by selecting a basic material with excellent wear resistance and rigidity, PU polymer and relevant solvent are mixed in proportion, relevant catalysts are added, and the adhesive is obtained after being stirred evenly, the uniformity of the obtained adhesive mixture is tested, part of the adhesive mixture is extracted as a test sample, the solid content in the test sample solution is tested, part of the adhesive mixture is heated to volatilize the liquid in the adhesive mixture, and the remaining solid particles are weighed. The obtained data is the mass of the solid particles and is marked as T1. The solid content P in the part of the adhesive mixture is calculated using the formula, , T2 represents the total mass of the extracted part of the adhesive mixture, C is the preset proportional coefficient, the solid content data after the test is compared with the specified threshold value K to determine the uniformity of the adhesive mixture, the solid content P measured by the formula is compared with the specified solid content threshold value K, if the solid content P value is greater than the specified solid content threshold value K, then the stirred adhesive mixture is determined to be uneven, if the solid content P value is less than or equal to the specified solid content threshold value K, then the stirred adhesive mixture is determined to be uniform, the unevenly stirred adhesive mixture is heated and stirred again to make it reach the uniformity standard of the adhesive mixture, the solid content of the heated and stirred adhesive mixture is tested, and the solid particle size ai, solid particle mass bi and solid particle number ci are tested and evaluated in three aspects, and the measured data of solid particle size ai, solid particle mass bi and solid particle number ci are respectively brought into the formula to obtain the solid content frame value Pi of the heated and stirred adhesive mixture, By comparing the obtained Pi with the solid content threshold value K, it is determined that the optimal temperature and the optimal heating time in the heating and stirring process are determined under different temperatures and different heating times. By recording the different times of heating and stirring the uneven adhesive mixture at the same temperature, and by recording the different temperatures of heating and stirring the uneven adhesive mixture under the same heating time, several portions of the adhesive mixture after heating and stirring in the above manner are respectively extracted, and the solid content P of the several portions of the adhesive mixture is calculated using the formula, and the solid content P of the extracted several portions of the adhesive mixture is evaluated, and on the basis of the evaluation of the solid content P, the uneven adhesive mixture during heating and stirring is detected. The influence of temperature and heating time on the mixture of the adhesive is specifically implemented as follows: at the same temperature, by evaluating the solid content P of multiple groups of adhesive mixtures and recording the heating time, the heating time of the adhesive mixture with a qualified solid content P after heating and stirring is obtained, the multiple groups of heating times are summed and averaged, and the average value is used to determine the optimal heating time threshold; at the same time, by evaluating the solid content P of multiple groups of adhesive mixtures and recording the heating temperatures of different components, the heating temperatures of multiple groups of adhesive mixtures with a qualified solid content after heating and stirring are obtained, the multiple groups of heating temperatures are summed and averaged, and the average value is used to determine the optimal heating temperature threshold.

[0087] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A process for preparing a PU polymer bonded grinding wheel, characterized in that: The main steps include: Step 1: Select the basic material; Step 2: Mix the PU polymer with the solvent to obtain an adhesive mixture, and test the adhesive mixture obtained by the reaction. The specific method is as follows: A1: Detect the uniformity of the prepared adhesive mixture; A2: Detecting the solid content of the prepared adhesive mixture; A3: Extract part of the adhesive mixture as a test sample, divide the extracted part of the adhesive mixture into several groups of equal amounts of adhesive mixtures, and test the solid content of the several groups of equal amounts of adhesive mixtures; A4: Sum and average the solid contents of several groups obtained in A3, and use the average value as the solid content frame value L1 of several groups of equal adhesive mixtures, and subtract the obtained solid content frame value from the solid content value in A2; A5, the solid content of several groups obtained in A3 and the average value obtained in A4 are made different, the obtained multiple groups of differences are summed and averaged, and the average value is used as the difference frame number L2; Step 3: Apply the adhesive prepared in step 2 on the base material and dry it by heating and curing; Step 4: Grinding the heated and cured base material using a grinding wheel; Step 5: Maintenance of the grinding wheel after use: cleaning, drying and rust prevention of the grinding wheel to ensure the service life of the grinding wheel; In A2, part of the adhesive mixture is heated to volatilize the liquid in the adhesive mixture, and the remaining solid particles are weighed. The obtained data is the mass of the solid particles and is marked as T1. The solid content P in this part of the adhesive mixture is calculated using the formula, , T2 represents the total mass of the extracted adhesive mixture, and C is the preset proportional coefficient; In A4 and A5, the calculated solid content frame value L1 and the difference frame number L2 are substituted into the formula, and the formula is: , R represents the frame value for detecting the uniformity of the adhesive mixture, S represents the preset proportional coefficient, N represents the number of components of the extracted part of the adhesive mixture, and the uniformity frame value R of the adhesive mixture obtained by the formula is compared with the specified solid content threshold K. The specific implementation method is as follows: B1: After comparing the uniformity frame value R of the adhesive mixture obtained with the specified solid content threshold K, the following situations are classified: If the solid content R value is greater than the specified solid content threshold K, it is determined that the stirred adhesive mixture is not uniform; If the solid content R value is less than or equal to the specified solid content threshold K, it is determined that the stirred adhesive mixture is uniform; B2: The unevenly stirred adhesive mixture is further heated and stirred to achieve the uniformity standard of the adhesive mixture.

2. The process for preparing a PU polymer bonded grinding wheel according to claim 1, characterized in that: In B2, the solid content of the adhesive mixture after heating and stirring is tested and evaluated from three aspects: solid particle size ai, solid particle mass bi and solid particle number ci. The measured data of solid particle size ai, solid particle mass bi and solid particle number ci are respectively used in the formula to obtain the solid content frame value Pi of the adhesive mixture after heating and stirring. , α and β are used as preset proportional coefficients. By comparing the obtained Pi solid content frame value with the solid content threshold K in step B1, the optimal temperature and optimal heating time in the heating and stirring process are determined under different temperatures and different heating times.

3. The process for preparing a PU polymer bonded grinding wheel according to claim 2, characterized in that: By recording different times of heating and stirring the uneven adhesive mixture at the same temperature, and by recording different temperatures of heating and stirring the uneven adhesive mixture under the same heating time, several portions of the adhesive mixture after heating and stirring in the above manner are respectively extracted, and the solid content P of the several portions of the adhesive mixture is calculated by the formula using the method in B2 above, and the solid content P of the several portions of the extracted adhesive mixture is evaluated. Based on the evaluation of the solid content P, the influence of the temperature and heating time on the uneven adhesive mixture during heating and stirring is detected. The specific implementation method is as follows: At the same temperature, the solid content P of multiple groups of adhesive mixtures is evaluated, and the heating time is recorded to obtain the heating time of the adhesive mixture with a qualified solid content P after heating and stirring. The heating time of multiple groups is summed and averaged, and the average value is used to determine the optimal heating time threshold; At the same time, by evaluating the solid content P of multiple groups of adhesive mixtures and recording the heating temperatures of different components, the heating temperatures of multiple groups of adhesive mixtures with qualified solid content after heating and stirring are obtained, the multiple groups of heating temperatures are summed and averaged, and the average value is used to determine the optimal heating temperature threshold.

4. The process for preparing a PU polymer bonded grinding wheel according to claim 3, characterized in that: The surface uniformity quality test is performed on the base material after grinding in step 4, and the specific implementation method is as follows: S1: Record the grinding time Tm and grinding pressure Qm of each base material; S2: Test each base material after grinding and use the formula , W represents the detection frame value of each base material, D is the error proportional coefficient, and the detection frame value W obtained by calculation is used as the judgment value of each base material after grinding; S3: replacing the insufficiently ground base material with a grinding wheel of a different specification and type for further grinding, performing the coating treatment in step 2 on the overly ground base material, and then grinding the coated base material; S4: Performing surface inspection in S2 on the further ground base material; during the grinding of the coated base material, adjusting the grinding time.

5. The process for preparing a PU polymer bonded grinding wheel according to claim 4, characterized in that: In S2, the calculated detection frame value W is compared with the specified value range (R1, R2): If the base material detection frame value W is within the specified value range (R1, R2), it is determined that the base material is ground evenly; If the basic material detection frame value W does not exist in the specified value range (R1, R2), then compare the basic material detection frame value W with R1 and R2; If W is greater than R2, it is determined that the base material is not ground sufficiently; If W is less than or equal to R1, it is determined that the base material is ground too sufficiently.

6. The process for preparing a PU polymer bonded grinding wheel according to claim 5, characterized in that: In S3, ultrasonic waves are used to detect the surface of the base material after the grinding process. The rebound time To after the ultrasonic wave hits the surface of the base material is detected and statistics are collected. o represents the rebound time of different groups when the ultrasonic wave contacts the surface of the base material. The formula is used to sum and take the average value Ty. Ty is used as the representative value of the detection rebound time. Multiple groups of evenly ground base materials are subjected to ultrasonic detection, and the rebound time Tl is recorded. l represents different groups of evenly ground base materials. The formula is used to sum and take the average value Tq. The obtained average value Tq is used as the threshold value for uniform grinding.

7. The process for preparing a PU polymer bonded grinding wheel according to claim 6, characterized in that: By comparing the representative value Ty of the detection rebound time with the grinding uniformity threshold Tq, the analysis and judgment are as follows: If the measured Tq value is less than or equal to the Ty value, it is determined that the standard material after the re-grinding process is qualified; If the measured Tq value is greater than the Ty value, it is determined that the standard material after the re-grinding process is unqualified.

8. A PU polymer bonded grinding wheel, characterized in that: The PU polymer-bonded grinding wheel is prepared by the preparation process described in any one of claims 1 to 7.

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