A method for testing the bonding strength between a silent sponge and a tire inner liner

Abstract

The present invention provides a method for testing the bonding strength between a silent sponge and a tire liner, and relates to the technical field of testing the physical properties of silent sponge tires, including using a cutting machine to cut a tire to be tested into rectangular samples of preset sizes, partially separating the silent sponge and the tire liner on the rectangular samples, and making a number of test samples; using a tensile machine clamp to clamp the silent sponge and tire liner parts of the test sample respectively, recording the force required at every moment during the process of peeling off the preset length test sample, and obtaining experimental test data; evaluating the bonding strength between the silent sponge and the tire liner of the tested tire. The present invention provides a method for testing the bonding strength between a silent sponge and a tire liner, which can test and verify the bonding performance between the silent sponge and the tire liner, thereby quantifying and predicting in advance whether the bonding performance of this batch of tires can meet the use requirements, and ensuring that the silent sponge of this batch of tires will not fall off during the driving of the tires.

Description

Technical Field

[0001] The invention belongs to the field of physical property testing of silent sponge tires, and in particular relates to a method for testing the bonding strength between a silent sponge and a tire inner liner. Background Art

[0002] In order to reduce the noise of semi-steel radial tires, tire manufacturers currently reduce tire noise by pasting sponges in the inner lining. The adhesion between the silent sponge and the tire inner lining directly affects the degree of tire noise reduction.

[0003] At present, the inspection of the bonding strength between the silent sponge and the tire lining is usually carried out by manual observation or direct hand-tearing. This method has only subjective judgment on the bonding strength between the silent sponge and the tire lining and lacks data support. It is impossible to quantify the bonding performance between the silent sponge and the tire lining and verify it. Therefore, it is impossible to accurately predict in advance whether the bonding performance of a batch of tires can meet the use requirements and whether it can be guaranteed that the silent sponge will not fall off during the driving of the tire. Summary of the invention

[0004] The present invention provides a method for testing the bonding strength between a noise-reducing sponge and a tire inner liner, so as to solve at least one of the technical problems mentioned above.

[0005] In order to solve the above technical problems, the present invention discloses a method for testing the bonding strength between a silent sponge and a tire inner liner, comprising the following steps:

[0006] S1. Sample preparation: Use a cutting machine to cut a section of the tire to be tested along the radial direction, and cut it into rectangular samples of preset sizes. Partially separate the silent sponge and the tire liner on the rectangular sample to make an effective clamping part. Repeat step S1 to make several test samples;

[0007] S2. Test: Use the tensile testing machine clamp to clamp the effective clamping parts of the test sample's mute sponge and tire inner liner respectively, and adjust the indoor environmental parameters to preset values, adjust the moving speed of the clamp and the peeling angle of the test sample to preset values, and record the force required at every moment during the peeling process of the preset length test sample, so as to obtain the test data;

[0008] S3. Evaluation: Analyze the test data to obtain the bonding strength between the tested tire silent sponge and the tire inner liner, and evaluate the bonding strength between the tested tire silent sponge and the tire inner liner.

[0009] Preferably, S10, using a cutting machine to cut a section of a preset length along the radial direction of the tire, and cutting off the sidewalls on both sides with a knife, and then using a cutting machine to cut the section into rectangular samples of preset width along the circumference, and ensuring that at least one complete adhesive strip is included within the preset width range;

[0010] S11. First, use a wallpaper knife to remove the tread part above the cap layer, and then use the wallpaper knife to separate the interface between the silent sponge and the tire inner liner, and open it to a preset length to make an effective clamping part for the test sample. During this process, the silent sponge and the tire inner liner must not be damaged;

[0011] Repeat the above operation to finally form several test samples.

[0012] Preferably, in step S10:

[0013] The cutting machine cuts a section of a preset length along the radial direction of the tire, where the preset length is 200mm±15mm;

[0014] Use a cutting machine to cut into rectangular samples of preset width along the circumference of the cross section, where the preset width is 38mm±1mm;

[0015] In step S11:

[0016] First, use a wallpaper knife to remove the tread part above the cap layer, and the thickness after removal should be kept at 7mm-15mm;

[0017] Use a wallpaper knife to separate the interface between the silent sponge and the tire liner, and open it to a preset length, where the preset length is 50±5mm.

[0018] Preferably, in step S2, the moving speed of the clamp is selected to be 50 mm / min±5 mm / min or 100 mm / min±5 mm / min, the peeling angle of the test sample is selected to be 180°, and the preset peeling length is 50 mm.

[0019] Preferably, in step S2, the indoor environmental parameters are adjusted to preset values, wherein the test temperature under normal temperature conditions is 23°C±1°C, the test temperature under high temperature conditions is 65°C±1°C, the test temperature under low temperature conditions is minus 30°C±1°C, and the insulation time is 30 minutes.

[0020] Preferably, step S3 includes drawing a force-time curve diagram during the test under the same environmental parameters based on the test data, and determining the bonding strength of each test sample under a certain environmental parameter based on the force-time curve diagram, expressed in N / mm.

[0021] Preferably, the method further includes calculating the actual qualified coefficient of the bonding strength between the tested tire silent sponge and the tire inner liner:

[0022] in, is the qualified coefficient of the bonding strength between the vth test sample silent sponge and the tire inner liner, is the pole distance of the force-time curve obtained under the u-th environmental parameter of the v-th test sample, is the number of types of environmental parameters during the test sample test, is a natural number, with a value of 2.71. is the bonding strength between the silent sponge and the tire inner liner under the u-th environmental parameter of the v-th test sample, is the benchmark bonding strength between the silent sponge and the tire inner liner of the qualified sample under the uth environmental parameter, is the actual qualified coefficient of the bonding strength between the tested tire silent sponge and the tire inner liner, is the total number of samples of the tested tires, i.e. the total number of test samples;

[0023] When the actual qualified coefficient of the bonding strength between the silent sponge of the tested tire and the tire inner lining is less than the preset qualified coefficient of the bonding strength between the silent sponge and the tire inner lining, it proves that the corresponding bonding strength between the silent sponge of the tested tire and the tire inner lining is unqualified.

[0024] Preferably, before step S1, the process further includes screening the tires to be tested:

[0025] S01. Place the drum test equipment outside the anechoic chamber, with one side of the drum of the drum test equipment extending into the anechoic chamber;

[0026] S02, sequentially mounting the batches of tires to be tested on a tire mounting rack in the anechoic chamber, with a slide being provided at the bottom of the tire mounting rack;

[0027] S03, simulating a road surface by rotating the drum, adjusting the pressure between the tire surface and the drum surface by using the slide, and performing different types of noise tests after the adjustment is completed. In this process, various types of noise generated during the test of each tire are detected, and a corresponding noise intensity curve is generated;

[0028] S04. Generate a noise comparison matrix based on a number of noise intensity curves, and screen out tires to be tested by comparing the noise comparison matrix with a noise reference matrix.

[0029] Preferably, the noise types in step S03 include pattern block ground hitting noise, tangential vibration noise and friction noise, and the corresponding generated noise intensity curves include pattern block ground hitting noise intensity curve, tangential vibration noise intensity curve and friction noise intensity curve;

[0030] When testing the tread block hitting noise, the drum rotates and the tire passively rolls with the drum. During this period, the pressure between the drum and the tire is periodically adjusted by adjusting the slide.

[0031] When performing tangential vibration and noise testing, the drum rotates while the tire passively rolls along with the drum, while the slide remains stationary;

[0032] When performing friction noise testing, the drum rotates the tire while the tire mounting frame keeps it stationary.

[0033] Preferably, step S03 includes:

[0034] S031. extracting several types of characteristic values ​​of each noise intensity curve;

[0035] S032. Based on all types of eigenvalues ​​of each noise intensity curve, generate a eigenvector corresponding to the noise intensity curve, and based on the eigenvector of each noise intensity curve, generate a noise contrast matrix;

[0036] Step S04 includes:

[0037] S041. Calculate the proximity between the noise comparison matrix corresponding to the k-th tire and the noise reference matrix:

[0038] in, is the closeness between the noise contrast matrix corresponding to the kth tire and the noise reference matrix, is the value of the i-th row and j-th column in the noise contrast matrix corresponding to the k-th tire, is the value of the i-th row and j-th column in the noise reference matrix, m is the total number of rows in the noise contrast matrix, and n is the total number of columns in the noise contrast matrix;

[0039] S042. Take the minimum value of the proximity between the noise comparison matrix and the noise reference matrix in the batch of tires to be tested. ,like , then The corresponding tire is used as the tire to be tested and step S1 is performed;

[0040] Otherwise, take the noise contrast matrix that is closest to the noise reference matrix , and greater than The corresponding tire is taken as the tire to be tested. If the proximity between the noise contrast matrix of all tires and the noise reference matrix is ​​less than , then the noise level of all tires in the batch to be tested is unqualified.

[0041] Compared with the prior art, the present invention has the following beneficial effects:

[0042] 1. The present invention provides a method for testing the bonding strength between a silent sponge and a tire inner liner, which can test and verify the bonding performance between the silent sponge and the tire inner liner, thereby quantifying and predicting in advance whether the bonding performance of a batch of tires can meet the use requirements, thereby ensuring that the silent sponges of the batch of tires will not fall off during the driving process of the tires;

[0043] 2. The present invention realizes a comprehensive evaluation of the bonding performance between the tire silent sponge and the tire inner liner by calculating the actual qualified coefficient of the bonding strength between the tested tire silent sponge and the tire inner liner;

[0044] 3. The adhesion strength test between the silent sponge and the tire lining of the present invention requires cutting the tire. In order to ensure the integrity of the batch of tires to the greatest extent, the adhesion strength test is achieved with the lowest cost. Therefore, the tires to be tested are selected by scientifically based sampling test. If the adhesion strength between the silent sponge and the tire lining of the tested tire is qualified, the adhesion strength between the silent sponge and the tire lining of the remaining tires in the batch must also be qualified, which improves the detection efficiency and saves the detection cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0046] Figure 1 It is a schematic diagram of the test sample of the present invention;

[0047] Figure 2 The force-time curve of the present invention is Figure 1 Schematic diagram;

[0048] Figure 3 The force-time curve of the present invention is Figure 2 Schematic diagram.

[0049] In the picture: 1. Silent sponge; 2. Tire lining. DETAILED DESCRIPTION

[0050] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0051] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes, and do not specifically refer to the order or sequence, nor are they used to limit the present invention. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions and technical features between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0052] The present invention provides the following embodiments

[0053] Example 1

[0054] The embodiment of the present invention provides a method for testing the bonding strength between a silent sponge and a tire inner liner. Figure 1-Figure 3 As shown, the following steps are included:

[0055] S1. Sample preparation: Use a cutting machine to cut a section along the radial direction of the tire to be tested, and cut it into rectangular samples of preset size, partially separate the silent sponge 1 and the tire inner liner 2 on the rectangular sample, make an effective clamping part, repeat step S1, and make several test samples;

[0056] S2, test: Use the tensile machine clamp to clamp the effective clamping parts corresponding to the silent sponge 1 and the tire inner liner 2 of the test sample respectively, and adjust the indoor environmental parameters to the preset values, adjust the moving speed of the clamp and the peeling angle of the test sample to the preset values, and record the force required at every moment during the peeling process of the preset length test sample, so as to obtain the test data;

[0057] S3. Evaluation: Analyze the test data to obtain the bonding strength between the tested tire silent sponge and the tire inner liner, and evaluate the bonding strength between the tested tire silent sponge and the tire inner liner.

[0058] Optionally, in step S2, the moving speed of the clamp is selected to be 50 mm / min±5 mm / min or 100 mm / min±5 mm / min, the peeling angle of the test sample is selected to be 180°, and the preset peeling length is 50 mm.

[0059] Optionally, in step S2, the indoor environmental parameters are adjusted to preset values, wherein the test temperature under normal temperature conditions is 23℃±1℃, the test temperature under high temperature conditions is 65℃±1℃, the test temperature under low temperature conditions is minus 30℃±1℃, and the insulation time is 30 minutes.

[0060] The working principle and beneficial effects of the above technical solution are as follows: the present invention selects a tire to be tested from a batch of tires, prepares samples of the tire to be tested, and makes several test samples, and then respectively performs adhesion strength test tests under different environmental parameters, and analyzes the test data to obtain the adhesion strength between the silent sponge of the tested tire and the tire inner liner, and evaluates the adhesion strength between the silent sponge of the tested tire and the tire inner liner, so as to know whether the adhesion performance of the tire can meet the use requirements. If the adhesion performance of the tire meets the use requirements, the adhesion performance between the silent sponge of other tires in the batch and the tire inner liner is good, and the silent sponge will not fall off during the driving of the tire;

[0061] The present invention provides a method for testing the bonding strength between a silent sponge and a tire inner liner, which can test and verify the bonding performance between the silent sponge and the tire inner liner, thereby quantifying and predicting in advance whether the bonding performance of a batch of tires can meet the use requirements, thereby ensuring that the silent sponges of this batch of tires will not fall off during the driving process of the tires.

[0062] Example 2

[0063] Based on Example 1, S10, a section of a preset length is cut along the radial direction of the tire using a cutting machine, and the sidewalls on both sides are cut off with a knife, and then a rectangular sample of a preset width is cut along the circumferential direction of the section using a cutting machine, and at least one complete adhesive strip is ensured to be included within the preset width range;

[0064] S11. First, use a wallpaper knife to remove the tread portion above the cap layer, and then use the wallpaper knife to separate the interface between the silent sponge 1 and the tire inner liner 2, and open it to a preset length to make an effective clamping portion for the test sample. During this process, the silent sponge 1 and the tire inner liner 2 must not be damaged;

[0065] Repeat the above operation to finally form several test samples.

[0066] Optionally, in step S10:

[0067] The cutting machine cuts a section of a preset length along the radial direction of the tire, where the preset length is 200mm±15mm;

[0068] Use a cutting machine to cut into rectangular samples of preset width along the circumference of the cross section, where the preset width is 38mm±1mm;

[0069] In step S11:

[0070] First, use a wallpaper knife to remove the tread part above the cap layer, and the thickness after removal should be kept at 7mm-15mm;

[0071] Use a wallpaper knife to separate the interface between the silent sponge 1 and the tire liner 2, and open it to a preset length, where the preset length is 50±5mm.

[0072] The working principle and beneficial effects of the above technical scheme are as follows: in the process of cutting the sample, by first cutting the radial section of the tire and then cutting the circumferential section, the accurate size and shape of the sample are guaranteed, and the reliability of the test is improved; by removing the tread portion above the cap layer, it can be ensured that only the bonding strength of the silent sponge and the tire liner is tested, and interference from other factors is eliminated; by keeping the thickness of the tread after removal within a certain range, the thickness of the test sample can be controlled, and the bonding strength can be further accurately evaluated; by separating the interface between the silent sponge and the tire liner with a wallpaper knife and opening it to a preset length, it is ensured that the test part of the sample is intact and not damaged, which improves the accuracy of the test and provides convenience for subsequent tests; the range of preset length and width is adjusted to make it more in line with actual application needs, thereby improving the reliability and applicability of the test results.

[0073] Example 3

[0074] Based on Example 1, step S3 includes drawing a force-time curve during the test under the same environmental parameters based on the experimental test data, and determining the bonding strength of each test sample under a certain environmental parameter based on the force-time curve, expressed in N / mm.

[0075] Among them, the bonding strength of each test sample under a certain environmental parameter is determined based on the force-time curve according to A, B, C, and D of GB / T 12833. The bonding strength is expressed by the median value of the peak value of the force-time curve, but the unit is expressed in N / mm. Specifically:

[0076] Method A (for curves with less than 5 peaks):

[0077] Determine the median and interpolar distance of the force peaks in force-time. If there is only one force peak, it can be considered the median.

[0078] Method B (applicable to curves with 5-20 peaks, such as curve Figure 1 shown):

[0079] According to the peak value on the middle 80% section of the complete curve, determine the median value and the pole distance of the peak value;

[0080] Method C (applicable to curves with more than 20 peaks and clearly identifiable, such as curve Figure 2 shown):

[0081] Draw a straight line perpendicular to the time axis through the midpoint of the complete curve, and draw 4 straight lines parallel to the straight line on both sides of the straight line, so that the distance between every two adjacent straight lines in the above 9 straight lines is equal (the error is not more than 1mm), and calculate the median and peak distance of the 9 peaks closest to these 9 straight lines respectively;

[0082] Method D (for oscillating curves)

[0083] A curve whose peak value is not clearly discernible is called an oscillating curve. For an oscillating curve, only the arithmetic mean is calculated, that is, the force value represented by the median line between the two horizontal straight lines where the highest point and the lowest point of the curve segment after removing the initial rising segment are located.

[0084] The working principle and beneficial effects of the above technical solution are as follows: the bonding strength is expressed by the median value of the peak value of the force-time curve, but the unit is expressed in N / mm. The larger the median value of the peak value of the force-time curve, the higher the bonding strength. The larger the pole distance of the force-time curve, the greater the difference in the bonding strength of the test samples. The higher the bonding strength and the smaller the difference in bonding strength, the better the bonding performance between the silent sponge and the tire lining.

[0085] Example 4

[0086] On the basis of Example 3, it also includes calculating the actual qualified coefficient of the bonding strength between the tested tire silent sponge and the tire inner liner:

[0087] in, is the qualified coefficient of the bonding strength between the vth test sample silent sponge and the tire inner liner, is the pole distance of the force-time curve obtained under the u-th environmental parameter of the v-th test sample, is the number of types of environmental parameters during the test sample test, is a natural number, with a value of 2.71. is the bonding strength between the silent sponge and the tire inner liner under the u-th environmental parameter of the v-th test sample, is the benchmark bonding strength between the silent sponge and the tire inner liner of the qualified sample under the uth environmental parameter, is the actual qualified coefficient of the bonding strength between the tested tire silent sponge and the tire inner liner, is the total number of samples of the tested tires, i.e. the total number of test samples;

[0088] When the actual qualified coefficient of the bonding strength between the silent sponge of the tested tire and the tire inner lining is less than the preset qualified coefficient of the bonding strength between the silent sponge and the tire inner lining, it proves that the corresponding bonding strength between the silent sponge of the tested tire and the tire inner lining is unqualified.

[0089] The working principle and beneficial effects of the above technical solution are as follows: first, the qualified coefficient of the bonding strength between the silent sponge and the tire lining of each test sample of the tested tire is calculated, and then the actual qualified coefficient of the bonding strength between the silent sponge and the tire lining of the tested tire is calculated through the qualified coefficient of the bonding strength between the silent sponge and the tire lining of each test sample of the tested tire. When calculating the qualified coefficient of the bonding strength between the silent sponge and the tire lining of the vth test sample, not only the difference between the bonding strength between the silent sponge and the tire lining under the uth environmental parameter of the vth test sample and the benchmark bonding strength between the silent sponge and the tire lining of the qualified sample under the uth environmental parameter is taken into account, At the same time, the pole distance of the force-time curve obtained under the u-th environmental parameter of the v-th test sample, that is, the size of the difference in bonding strength, is taken into account, so that the calculation result is more reliable. When the bonding strength between the silent sponge and the tire inner liner under the u-th environmental parameter of the v-th test sample is greater than the benchmark bonding strength between the silent sponge and the tire inner liner of the qualified sample under the u-th environmental parameter, and the smaller the pole distance of the force-time curve obtained under the u-th environmental parameter of the v-th test sample, the greater the qualified coefficient of the bonding strength between the silent sponge and the tire inner liner of the v-th test sample, at this time, both the size and uniformity of the bonding strength of the v-th test sample are good;

[0090] When calculating the actual qualified coefficient of the bonding strength between the tested tire silent sponge and the tire inner liner, in addition to considering the sum of the qualified coefficients of the bonding strength between the silent sponge and the tire inner liner of several test samples, The size of the bonding strength between the silent sponge and the tire inner liner of several test samples is larger, and the actual qualified coefficient of the bonding strength between the silent sponge and the tire inner liner of the tested tire is larger. The closeness of the bonding strength between the test samples is also taken into account. It indicates the degree of unevenness of the bonding strength values ​​between the test samples. The more uneven the bonding strength values ​​between the test samples are, the smaller the actual qualified coefficient of the bonding strength between the tested tire silent sponge and the tire inner liner is.

[0091] Example 5

[0092] On the basis of Example 1, before step S1, the method further includes screening the tires to be tested:

[0093] S01. Place the drum test equipment outside the anechoic chamber, with one side of the drum of the drum test equipment extending into the anechoic chamber;

[0094] S02, sequentially mounting the batches of tires to be tested on a tire mounting rack in the anechoic chamber, with a slide being provided at the bottom of the tire mounting rack;

[0095] S03, simulating a road surface by rotating the drum, adjusting the pressure between the tire surface and the drum surface by using the slide, and performing different types of noise tests after the adjustment is completed. In this process, various types of noise generated during the test of each tire are detected, and a corresponding noise intensity curve is generated;

[0096] S04. Generate a noise comparison matrix based on a number of noise intensity curves, and screen out tires to be tested by comparing the noise comparison matrix with a noise reference matrix.

[0097] The working principle and beneficial effects of the above technical solution are as follows: since the adhesion strength test between the silent sponge and the tire inner liner of the present invention requires cutting the tire, in order to ensure the integrity of the batch of tires to the greatest extent, the adhesion strength test is achieved with the minimum cost, and thus the tires to be tested are selected by scientifically based sampling test. If the adhesion strength between the silent sponge and the tire inner liner of the tested tire is qualified, the adhesion strength between the silent sponge and the tire inner liner of the remaining tires in the batch must also be qualified, thereby improving the detection efficiency and saving the detection cost;

[0098] During screening, the road surface is simulated by rotating the drum, and the pressure between the tire table and the drum surface is adjusted by the slide. After the adjustment, different types of noise tests are carried out. In this process, various types of noise generated during the test of each tire are detected, and the corresponding noise intensity curve is generated. A noise comparison matrix is ​​generated based on several noise intensity curves. The noise comparison matrix is ​​compared with the noise reference matrix to screen out the tires to be tested.

[0099] Example 6

[0100] On the basis of Embodiment 5, the noise types in step S03 include pattern block ground hitting noise, tangential vibration noise and friction noise, and the corresponding generated noise intensity curves include pattern block ground hitting noise intensity curve, tangential vibration noise intensity curve and friction noise intensity curve;

[0101] When testing the tread block hitting noise, the drum rotates and the tire passively rolls with the drum. During this period, the pressure between the drum and the tire is periodically adjusted by adjusting the slide.

[0102] When performing tangential vibration and noise testing, the drum rotates while the tire passively rolls along with the drum, while the slide remains stationary;

[0103] When performing friction noise testing, the drum rotates the tire while the tire mounting frame keeps it stationary.

[0104] The working principle and beneficial effects of the above technical solution are as follows: the tread block ground hitting noise is the noise generated when the tire tread contacts the ground, and thus the tire passively rolls with the drum while the drum rotates, and during this period, the pressure between the drum and the tire is adjusted by adjusting the slide periodically, and the slide periodically adjusts the pressure between the drum and the tire to simulate the ground hitting action;

[0105] Tangential vibration noise is the noise caused by the lateral vibration of the tire when it rolls on the drum. Therefore, the drum rotates while the tire passively rolls with the drum, while the slide remains stationary.

[0106] Friction noise is the noise caused by the friction between the tire and the drum surface. The noise is detected using a contact microphone, whereby the drum is rotated and the tire remains stationary under the action of the tire mounting frame to simulate;

[0107] The above three methods can concentrate the detection results on a certain noise to the greatest extent, thereby eliminating the interference of the other two noises to the greatest extent.

[0108] Example 7

[0109] Based on Example 5, step S03 includes:

[0110] S031. extracting several types of characteristic values ​​of each noise intensity curve;

[0111] S032. Based on all types of eigenvalues ​​of each noise intensity curve, generate a eigenvector corresponding to the noise intensity curve, and based on the eigenvector of each noise intensity curve, generate a noise contrast matrix;

[0112] Step S04 includes:

[0113] S041. Calculate the proximity between the noise comparison matrix corresponding to the k-th tire and the noise reference matrix:

[0114] in, is the closeness between the noise contrast matrix corresponding to the kth tire and the noise reference matrix, is the value of the i-th row and j-th column in the noise contrast matrix corresponding to the k-th tire, is the value of the i-th row and j-th column in the noise reference matrix, m is the total number of rows in the noise contrast matrix, and n is the total number of columns in the noise contrast matrix;

[0115] S042. Take the minimum value of the proximity between the noise comparison matrix and the noise reference matrix in the batch of tires to be tested. ,like , then The corresponding tire is used as the tire to be tested and step S1 is performed;

[0116] Otherwise, take the noise contrast matrix that is closest to the noise reference matrix , and greater than The corresponding tire is taken as the tire to be tested. If the proximity between the noise contrast matrix of all tires and the noise reference matrix is ​​less than , then the noise level of all tires in the batch to be tested is unqualified.

[0117] The working principle and beneficial effects of the above technical solution are as follows: the characteristic values ​​include the noise intensity peak value, peak frequency and peak duration, specifically including the pattern block ground hitting noise intensity peak value, pattern block ground hitting noise peak frequency, pattern block ground hitting noise peak duration, tangential vibration noise intensity peak value, tangential vibration noise peak frequency, tangential vibration noise peak duration, friction noise intensity peak value, friction noise peak frequency and friction noise peak duration;

[0118] By calculating the proximity between the noise contrast matrix corresponding to the kth tire and the noise reference matrix, the minimum value of the proximity between the noise contrast matrix and the noise reference matrix in the batch of tires to be tested is taken. ,like , then The corresponding tire is used as the tire to be tested to perform step S1, that is, if the degree of proximity between the noise contrast matrix and the noise reference matrix of the tire whose noise contrast matrix is ​​least close to the noise reference matrix in the batch of tires to be tested is greater than the degree of proximity corresponding to the tire with qualified bonding strength, it indicates that the bonding strength of the tire most likely to be unqualified in the batch of tires is also preliminarily qualified. If the result of the bonding strength test of the tire to be tested is qualified, then the remaining tires in the batch must be qualified, where Indicates the proximity corresponding to the tire with qualified bonding strength;

[0119] If there are tires that fail the preliminary test, the noise comparison matrix is ​​closest to the noise reference matrix. , and greater than The corresponding tire is taken as the tire to be tested. If the test result of the tire is that the adhesion performance is qualified, the proximity of the noise contrast matrix to the noise reference matrix is ​​greater than that of the tire, and the rest of the tires are qualified. If the proximity of the noise contrast matrix to the noise reference matrix of all tires is less than , then the noise of all tires in the batch to be tested is unqualified, and step S1 does not need to be performed at this time.

[0120] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A method for testing the bonding strength between a silent sponge and a tire inner liner, characterized in that: The following steps are involved: S1, sample preparation: using a cutting machine to cut a section along the radial direction of the tire to be tested, and cut it into a rectangular sample of a preset size, partially separate the silent sponge (1) and the tire inner liner (2) on the rectangular sample, make an effective clamping part, repeat step S1, and make a number of test samples; S2, test: using the tensile machine clamp to clamp the effective clamping parts corresponding to the silent sponge (1) and the tire inner liner (2) of the test sample respectively, and at the same time adjusting the indoor environmental parameters to preset values, adjusting the moving speed of the clamp and the peeling angle of the test sample to preset values, and recording the force required at every moment during the process of peeling the preset length test sample, so as to obtain test data; S3. Evaluation: Analyze the test data to obtain the bonding strength between the tested tire silent sponge and the tire inner liner, and evaluate the bonding strength between the tested tire silent sponge and the tire inner liner; Step S3 includes drawing a force-time curve diagram during the test process under the same environmental parameters based on the test data, and determining the bonding strength of each test sample under a certain environmental parameter based on the force-time curve diagram, with the unit expressed in N / mm; It also includes calculating the actual qualified coefficient of the bonding strength between the tested tire silent sponge and the tire inner liner: in, is the qualified coefficient of the bonding strength between the vth test sample silent sponge and the tire inner liner, is the pole distance of the force-time curve obtained under the u-th environmental parameter of the v-th test sample, is the number of types of environmental parameters during the test sample test, is a natural number, with a value of 2.

71. is the bonding strength between the silent sponge and the tire inner liner under the u-th environmental parameter of the v-th test sample, is the benchmark bonding strength between the silent sponge and the tire inner liner of the qualified sample under the uth environmental parameter, is the actual qualified coefficient of the bonding strength between the tested tire silent sponge and the tire inner liner, is the total number of samples of the tested tires, i.e. the total number of test samples; When the actual qualified coefficient of the bonding strength between the silent sponge of the tested tire and the tire inner lining is less than the preset qualified coefficient of the bonding strength between the silent sponge and the tire inner lining, it proves that the corresponding bonding strength between the silent sponge of the tested tire and the tire inner lining is unqualified.

2. The method for testing the bonding strength between a noise-reducing sponge and a tire inner liner according to claim 1, characterized in that: S10, using a cutting machine to cut a section of a preset length along the radial direction of the tire, and cutting off the sidewalls on both sides with a knife, and then using a cutting machine to cut the section into rectangular samples of preset width along the circumference, and ensuring that at least one complete adhesive strip is included within the preset width; S11. First, use a wallpaper knife to remove the tread portion above the crown layer, and then use the wallpaper knife to separate the interface between the silent sponge (1) and the tire inner liner (2), and open it to a preset length to make an effective clamping portion of the test sample. During this process, the silent sponge (1) and the tire inner liner (2) must not be damaged. Repeat the above operation to finally form several test samples.

3. The method for testing the bonding strength between a noise-reducing sponge and a tire inner liner according to claim 2, characterized in that: In step S10: The cutting machine cuts a section of a preset length along the radial direction of the tire, where the preset length is 200mm±15mm; Use a cutting machine to cut into rectangular samples of preset width along the circumference of the cross section, where the preset width is 38mm±1mm; In step S11: First, use a wallpaper knife to remove the tread part above the cap layer, and the thickness after removal should be kept at 7mm-15mm; The interface between the silent sponge (1) and the tire inner liner (2) is separated by a wallpaper knife and opened to a preset length, wherein the preset length is 50±5 mm.

4. The method for testing the bonding strength between a noise-reducing sponge and a tire inner liner according to claim 1, characterized in that: In step S2, the moving speed of the clamp is selected as 50 mm / min±5 mm / min or 100 mm / min±5 mm / min, the peeling angle of the test sample is selected as 180°, and the preset peeling length is 50 mm.

5. The method for testing the bonding strength between a noise-reducing sponge and a tire inner liner according to claim 1, characterized in that: In step S2, the indoor environmental parameters are adjusted to preset values, wherein the test temperature under normal temperature conditions is 23°C±1°C, the test temperature under high temperature conditions is 65°C±1°C, the test temperature under low temperature conditions is minus 30°C±1°C, and the insulation time is 30 minutes.

6. The method for testing the bonding strength between a noise-reducing sponge and a tire inner liner according to claim 1, characterized in that: Before step S1, the following steps are also included: S01. Place the drum test equipment outside the anechoic chamber, with one side of the drum of the drum test equipment extending into the anechoic chamber; S02, sequentially mounting the batches of tires to be tested on the tire mounting rack in the anechoic chamber, with a slide being provided at the bottom of the tire mounting rack; S03, simulating a road surface by rotating the drum, adjusting the pressure between the tire surface and the drum surface by using the slide, and performing different types of noise tests after the adjustment is completed. In this process, various types of noise generated during the test of each tire are detected, and a corresponding noise intensity curve is generated; S04. Generate a noise comparison matrix based on a number of noise intensity curves, and screen out tires to be tested by comparing the noise comparison matrix with a noise reference matrix.

7. The method for testing the bonding strength between a noise-reducing sponge and a tire inner liner according to claim 6, characterized in that: The noise types in step S03 include pattern block ground hitting noise, tangential vibration noise and friction noise, and the corresponding generated noise intensity curves include pattern block ground hitting noise intensity curve, tangential vibration noise intensity curve and friction noise intensity curve; When testing the tread block hitting noise, the drum rotates and the tire passively rolls with the drum. During this period, the pressure between the drum and the tire is periodically adjusted by adjusting the slide. When performing tangential vibration and noise testing, the drum rotates while the tire passively rolls along with the drum, while the slide remains stationary; When performing friction noise testing, the drum rotates the tire while the tire mounting frame keeps it stationary.

8. The method for testing the bonding strength between a noise-reducing sponge and a tire inner liner according to claim 6, characterized in that: Step S03 includes: S031. extracting several types of characteristic values ​​of each noise intensity curve; S032. Based on all types of eigenvalues ​​of each noise intensity curve, generate a eigenvector corresponding to the noise intensity curve, and based on the eigenvector of each noise intensity curve, generate a noise contrast matrix; Step S04 includes: S041. Calculate the proximity between the noise comparison matrix corresponding to the k-th tire and the noise reference matrix: in, is the closeness between the noise contrast matrix corresponding to the kth tire and the noise reference matrix, is the value of the i-th row and j-th column in the noise contrast matrix corresponding to the k-th tire, is the value of the i-th row and j-th column in the noise reference matrix, m is the total number of rows in the noise contrast matrix, and n is the total number of columns in the noise contrast matrix; S042. Take the minimum value of the proximity between the noise comparison matrix and the noise reference matrix in the batch of tires to be tested. ,like , then The corresponding tire is used as the tire to be tested and step S1 is performed. Indicates the proximity corresponding to the tire with qualified bonding strength; Otherwise, take the noise contrast matrix that is closest to the noise reference matrix , and greater than The corresponding tire is taken as the tire to be tested. If the proximity between the noise contrast matrix of all tires and the noise reference matrix is ​​less than , then the noise level of all tires in the batch to be tested is unqualified.

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