阅读说明：本技术 一种胎侧应变裂纹测试方法、装备和应用 (Sidewall strain crack testing method, device and application ) 是由 王建兵 侯丹丹 张春生 王昱壮 高翔 徐晓鹏 黄继文 欧阳好 于 2021-06-07 设计创作，主要内容包括：本申请涉及轮胎制造领域,尤其涉及一种胎侧应变裂纹测试方法、装备和应用。一种胎侧应变裂纹测试方法,其特征在于,该方法包括以下的步骤：1)从轮缘处开始向胎冠方向每隔一段距离用刀具垂直切入,各处切口长度、深度保持一致；各切口位沿周向错开不共线；记录包括切口长度L1、宽度W1的初始数据；2)对轮胎进行充气,每次充气后放置使轮胎变形达到稳定状态；对达到稳定状态的轮胎进行加载,并记录包括切口长度L2、宽度W2的试验数据；3)根据应变计算公式计算胎侧不同气压载荷下的应变,确定胎侧不同部位的应变趋势。该方法通过对胎侧裂纹应变的研究能够准确还原轮胎应变情况,并对胎侧应变裂纹影响因素进行探索分析。(The application relates to the field of tire manufacturing, in particular to a method, equipment and application for testing strain cracks of a tire side. A sidewall strain crack test method, comprising the steps of: 1) cutting vertically from the edge to the crown direction at intervals by using a cutter, wherein the length and the depth of each cut are kept consistent; all the incision positions are staggered along the circumferential direction and are not collinear; recording initial data including a cut length L1, a width W1; 2) inflating the tire, and placing the tire after each inflation to enable the tire to deform to reach a stable state; loading the tire to a steady state and recording test data including a cut length L2, a width W2; 3) and calculating the strain of the tire side under different air pressure loads according to a strain calculation formula, and determining the strain trend of different parts of the tire side. According to the method, the tire strain condition can be accurately reduced through the research on the tire side crack strain, and the influence factors of the tire side strain crack are explored and analyzed.)

1. A sidewall strain crack test method, comprising the steps of:

1) cutting vertically from the edge to the crown direction at intervals by using a cutter, wherein the length and the depth of each cut are kept consistent; all the incision positions are staggered along the circumferential direction and are not collinear; recording initial data including a cut length L1, a width W1;

2) inflating the tire, and placing the tire after each inflation to enable the tire to deform to reach a stable state; loading the tire to a steady state and recording test data including a cut length L2, a width W2;

3) according to the strain calculation formulaAnd calculating the strain of the tire side under different air pressure loads, and determining the strain trend of different parts of the tire side.

2. The method for testing the strain cracks of the tire side wall, according to claim 1, wherein the incision distance in the step 1) is 3-8mm, and the incision positions are staggered from each other by a distance larger than 20mm in the circumferential direction.

3. The method of claim 1, wherein step 2) is performed for 20-30 hours after each inflation.

4. An indoor test device, which adopts the method of any one of claims 1 to 3, and comprises a safety protection device, a tire loading device, an automatic photographing device and an automatic data uploading analysis and output module, wherein the tire loading device is used for loading a tire reaching a stable state, the automatic photographing device is used for acquiring a sidewall photo, and the automatic data uploading analysis and output module is used for recording acquired data of the sidewall photo, analyzing, processing, uploading and outputting the data.

5. A tire profile and method of construction, the method comprising the steps of:

1) processing data acquired by the method of any one of claims 1 to 3;

2) carrying out multi-factor and multi-level test analysis including tire pressure, loading load and tire contour design on different positions of the tire side, and comparing the analysis result with the actual use condition of the tire;

3) and optimally designing the tire contour and construction according to the simulation result.

6. A test computer apparatus, the apparatus comprising a processor, wherein the processor performs the steps of:

1) processing data acquired by the method of any one of claims 1 to 3;

2) carrying out multi-factor and multi-level test analysis including tire pressure, loading load and tire contour design on different positions of the tire side, and comparing the analysis result with the actual use condition of the tire;

3) and optimally designing the tire contour and construction according to the simulation result.

7. A non-transitory computer readable carrier medium storing program instructions that, when executed by a processor, cause the processor to perform the steps of:

1) processing data acquired by the method of any one of claims 1 to 3;

2) carrying out multi-factor and multi-level test analysis including tire pressure, loading load and tire contour design on different positions of the tire side, and comparing the analysis result with the actual use condition of the tire;

3) and optimally designing the tire contour and construction according to the simulation result.

8. A method for optimally designing the tire contour and construction based on big data is characterized in that the method uploads the data acquired by the method of any one of claims 1 to 3 to a big data processing center, the big data processing center processes the acquired data, and a tire contour and construction optimal design scheme is given.

Technical Field

The application relates to the field of tire manufacturing, in particular to a method, equipment and application for testing strain cracks of a tire side.

Background

The occurrence rate of the cracks on the sidewall of the all-steel tire is high in the market use process, and the service life and the driving safety of the tire are seriously influenced. The research on the strain condition and the influence factors of the cracks on the tire side wall has guiding significance on the optimization of the tire design. At present, no test method and test equipment specially aiming at tire side wall strain cracks exist in the market.

Disclosure of Invention

In order to accurately simulate the strain condition of the tire side in practical use, the method for testing the strain crack of the tire side can accurately reduce the strain condition of the tire through the research on the strain of the crack of the tire side, and explore and analyze the influence factors of the strain crack of the tire side.

In order to achieve the above object, the present application adopts the following technical solutions:

a sidewall strain crack test method, comprising the steps of:

1) cutting vertically from the edge to the crown direction at intervals by using a cutter, wherein the length and the depth of each cut are kept consistent; all the incision positions are staggered along the circumferential direction and are not collinear; recording initial data including a cut length L1, a width W1;

2) inflating the tire, and placing the tire after each inflation to enable the tire to deform to reach a stable state; loading the tire to a steady state and recording test data including a cut length L2, a width W2;

3) according to the strain calculation formulaAnd calculating the strain of the tire side under different air pressure loads, and determining the strain trend of different parts of the tire side.

Preferably, the distance cut in the step 1) is 3-8mm, and the positions of the cuts are staggered by more than 20mm along the circumferential direction.

Preferably, step 2) is left for 20 to 30 hours after each aeration.

Further, this application still discloses an indoor test equipment, this equipment adopts a side wall strain crack test method, including safety device, tire loading device, automatic device, the automatic analysis and the output module of uploading of data, tire loading device is used for loading the tire that reaches steady state, and the automatic device of shooing gathers the side wall photo, and the automatic analysis and the output module of uploading of data is to the data and analysis processes of gathering of side wall photo record, uploads and the output.

Further, the application also discloses a tire profile and a construction method, wherein the method comprises the following steps:

1) processing the data acquired by the method;

2) carrying out multi-factor and multi-level test analysis including tire pressure, loading load and tire contour design on different positions of the tire side, and comparing the analysis result with the actual use condition of the tire;

3) and optimally designing the tire contour and construction according to the simulation result.

Further, the present application also discloses an intelligent test computer device, the device comprising a processor, the processor performing the steps of:

1) processing the data acquired by the method;

2) carrying out multi-factor and multi-level test analysis including tire pressure, loading load and tire contour design on different positions of the tire side, and comparing the analysis result with the actual use condition of the tire;

3) and optimally designing the tire contour and construction according to the simulation result.

Further, the present application also discloses a non-transitory computer readable carrier medium storing program instructions that, when executed by a processor, perform the steps of:

1) processing the data acquired by the method;

2) carrying out multi-factor and multi-level test analysis including tire pressure, loading load and tire contour design on different positions of the tire side, and comparing the analysis result with the actual use condition of the tire;

3) and optimally designing the tire contour and construction according to the simulation result.

Further, the application also discloses a method for optimally designing the tire contour and construction based on big data, the method uploads the data acquired by the tire side strain crack testing method to a big data processing center, the big data processing center performs big data processing on the acquired data, and a tire contour and construction optimal design scheme is given.

Due to the adoption of the technical scheme, the strain change trend of the cracks on the side wall of the tire can be simulated when the tire is actually used. According to the simulation result, the tire profile and construction are optimally designed, the service life of the optimized tire is prolonged by 10%, and the driving safety is synchronously improved.

Drawings

Fig. 1 is a schematic view of the equipment structure of the present application.

FIG. 2 is a schematic diagram of the position structure of the vertical cutting of the tool.

FIG. 3 is a schematic diagram of a structure in which each point is staggered in the circumferential direction.

FIG. 4 is a plot of test data for strain versus position.

Detailed Description

The following detailed description of embodiments of the present application refers to the accompanying drawings.

As shown in figure 1, the equipment adopts the sidewall strain crack testing method, and comprises a safety protection device 1, a tire loading device 2, an automatic photographing device 3 and a data automatic uploading analysis and output module 4, wherein the tire loading device 2 is used for loading a tire reaching a stable state, the automatic photographing device 3 collects sidewall photos, and the data automatic uploading analysis and output module 4 records collected data of the collected sidewall photos, analyzes and processes the data, and uploads and outputs the data.

The testing method adopted by the equipment comprises the following steps:

1) cutting vertically from the edge to the crown direction at intervals by using a cutter, wherein the length and the depth of each cut are kept consistent; all the incision positions are staggered along the circumferential direction and are not collinear; recording initial data including a cut length L1, a width W1;

2) inflating the tire, and placing the tire after each inflation to enable the tire to deform to reach a stable state; loading the tire to a steady state and recording test data including a cut length L2, a width W2;

3) according to the strain calculation formulaAnd calculating the strain of the tire side under different air pressure loads, and determining the strain trend of different parts of the tire side.

Taking the specification of 12.00R20 as an example, the test air pressure is respectively selected to be 700kPa/800kPa/900kPa/1000kPa/1100kPa, the test part is vertically cut into the tire crown direction every 5mm from the position 5mm away from the waterproof line, as shown in figure 3, all the point positions are staggered along the circumferential direction (the circumferential distance is more than or equal to 20 mm), as shown in figure 4. The test data curve is shown in fig. 5.

Example 1

The test method and the test equipment are used for carrying out test analysis by taking the 12.00R20 specification as an example. The inflation pressure was 50kPa, the applied load was 0kg, the tire design profile was C1, and sidewall strain crack data acquisition analysis was performed.

Example 2

The test method and the test equipment are used for carrying out test analysis by taking the 12.00R20 specification as an example. The inflation pressure was 50kPa, the applied load was 0kg, the tire design profile was C2, and sidewall strain crack data acquisition analysis was performed.

Example 3

The test method and the test equipment are used for carrying out test analysis by taking the 12.00R20 specification as an example. The inflation pressure was 800kPa, the applied load was 4000kg, the tire design profile was C2, and sidewall strain crack data acquisition analysis was performed.

Example 4

The test method and the test equipment are used for carrying out test analysis by taking the 12.00R20 specification as an example. The inflation pressure was 1200kPa, the applied load was 8000kg, the tire design profile was C2, and sidewall strain crack data acquisition analysis was performed.

Through comparative analysis of the above example data, the C2 profile strain is found to be smaller than the C1 profile strain, and is the main influence factor of the strain; the high-load sidewall strain is greater than the low-load sidewall strain and is a secondary influence factor of strain; the high-air-pressure tire side strain is larger than that of the low-air-pressure tire side strain, and the influence degree is the largest. In addition, it was found by data analysis that sidewall strain was greatest near the bead and least at the inflated cross-section wide attachment.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present disclosure, including any person skilled in the art, having the benefit of the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art. The general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.