A method, apparatus and computer program for measuring the angle of a radial tire belt

Abstract

The present application relates to the field of tire measurement technology, and more particularly to a radial tire belt angle measurement method, device and computer program. The present application pastes a medium that cannot be penetrated by X-rays on the tire tread as a reference and measures the angle of the reference, scans the tire belt of the tire using a tire X-ray detection device and generates a picture, and then calculates the angle of the belt in the overall tire according to the angle change of the picture reference in the CAD software. This kind of belt angle measurement method has the advantages of low cost, high efficiency and high accuracy.

Description

Technical Field

[0001] This invention relates to the field of tire measurement technology, and in particular to a method, device and computer program for measuring the belt layer angle of a radial tire. Background Technology

[0002] A tire consists of components such as the tread, base rubber, sidewall, gusset, bead, carcass, and belt layer. Among these, the carcass, bead, and belt layer are the main load-bearing structures, with the belt layer in the tread area bearing more than 70% of the tire's air pressure load. Compared to the carcass and bead, the belt layer structure is more complex, not only because it is composed of multiple layers of steel wire-rubber composite material at different angles, but also because the angle of the belt layer varies at different locations during tire manufacturing. That is, the angle of the belt layer in different locations in the finished tire is different, and it is also different from that in the semi-finished product. Even within the same belt layer, the angle between the middle position and the edge position can differ to some extent. The belt layer angle has a significant impact on tire inflation deformation, contact patch, rolling resistance, durability, and high-speed performance. Therefore, checking the belt layer angle in a finished tire is crucial. It is not only an important indicator for judging whether tire manufacturing meets design requirements, but also a key parameter for tire performance simulation analysis (e.g., patent CN115659625A: a method, application, and computer program for predicting rolling resistance of periodic pattern tires; CN116776685A: a method, application, and computer program for rapidly predicting the steady-state rolling skeleton force of a tire; CN116011298A: a method, application, and software product for rapidly predicting the high-speed rotational deformation of radial tires; CN114889372A: a method, application, and program product for judging the tension and compression state of rubber material in the tire bead area). Therefore, accurate measurement is necessary.

[0003] Currently, the main method for measuring the angle of tire belt cords is to peel off the rubber material above the tire belt layer to expose the belt layer, and then use a protractor to measure the angle of the belt cords. This method requires special peeling of the tire rubber material before the belt cord angle can be measured, which makes the experimental process extremely time-consuming. Furthermore, the position of the steel cords may change significantly due to the lack of proper rubber restraint, ultimately leading to a deviation between the measured result and the actual belt angle in a complete tire. Therefore, there is a need for a low-cost, high-efficiency, and highly accurate method for measuring tire belt angles. Summary of the Invention

[0004] The purpose of this invention is to address the problems existing in the prior art and provide a method for measuring the angle of the steel wires in the belt layer of a radial tire. This method involves attaching an X-ray-impenetrable medium to the tire tread as a reference object and measuring its angle. The tire belt is then scanned using a tire X-ray inspection device to generate an image. Finally, CAD software calculates the angle of the belt layer in the entire tire based on the angle changes of the reference object in the image. This belt layer angle measurement method has the advantages of low cost, high efficiency, and high accuracy.

[0005] A method for measuring the belt ply angle of a radial tire, the method comprising the following steps:

[0006] The first step is to attach n thin, X-ray-impenetrable reference strips (n ≥ 1) along the tire's axis to the tire tread. The angle formed by one side of each reference strip at the target location and the tire's circumferential direction is denoted as θ. i ;

[0007] The second step is to use a tire X-ray tire inspection device to scan the tire with the reference object attached in the first step and generate an image;

[0008] The third step is to import the image generated in the second step into the CAD software. First, draw a 1mm-2mm line segment Lyi along a long boundary of the shadow of the reference object at the target location. Then, starting from one end of line segment Lyi, draw a 1mm-2mm line segment Lzi along the tire circumference. The angle formed by the two line segments is an acute angle. Finally, measure the angle formed by each reference object line segment and the tire circumferential line segment at the target location and record it as θ. ni Then, the angular deviation of each reference object is calculated as Δθ. n Δθ n =θ ni ―θ i

[0009] The fourth step is to create a 1mm-2mm line segment L′ along the same layer of the shading band at the target location in the CAD software. yi Then, starting from one end of the line segment, draw a line segment L′ of 1mm-2mm along the circumference of the tire. zi Finally, the angle formed by each belt segment and the target position of the tire circumferential segment is measured and recorded as α. ni The actual angle α′ of the belt can be calculated based on the angle change difference obtained in the third step. ni :

[0010] α′ ni =α ni ―Δθ n

[0011] The above steps can be used to measure the belt layer angle at the target position of a radial tire.

[0012] Preferably, the width of the elongated reference object is less than 20mm, and the length of one side at the target position is 1mm-2mm.

[0013] Preferably, if there are multiple reference objects in the step, the angle deviation Δθ n Determined according to the following formula:

[0014]

[0015] Furthermore, the present invention also discloses a radial tire belt layer angle measuring device, which includes a slender strip reference object that cannot be penetrated by X-rays, an X-ray tire inspection device, and a computer. The measuring device uses the method described above to measure the radial tire belt layer angle.

[0016] Furthermore, the present invention also discloses a computer device, including a memory, a processor, and a computer program stored in the memory, wherein the processor executes the computer program to implement steps three to four of the method.

[0017] Furthermore, the present invention also discloses a computer-readable storage medium storing a computer program or instructions thereon, which, when executed by a processor, implements steps three to four of the method.

[0018] Furthermore, the present invention also discloses a computer program product, including a computer program or instructions, which, when executed by a processor, implement steps three to four of the method.

[0019] This invention employs the aforementioned technical solution, attaching an X-ray-impenetrable medium to the tire tread as a reference object and measuring its angle. A tire X-ray inspection device is then used to scan the tire belt and generate an image. Finally, CAD software calculates the angle of the belt layer within the entire tire based on the angle changes of the reference object in the image. This belt layer angle measurement method offers advantages such as low cost, high efficiency, and high accuracy. Attached Figure Description

[0020] Figure 1 This is a schematic diagram showing the angle and direction of the reference patch.

[0021] Figure 2 The image shows an X-ray scan of the actual reference object, the tire, and the angle of the reference object.

[0022] Figure 3 This is an X-ray scan of the actual tire belt angle. Detailed Implementation

[0023] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present invention.

[0024] Taking 225 / 45R17 as an example, the implementation steps according to the present invention are as follows:

[0025] The first step is to attach one (n ≥ 1) thin (width less than 20mm) strip-shaped reference object, which cannot be penetrated by X-rays, to the tire tread along the tire axis. The angle formed by one side (1mm-2mm in length) of the reference object at the target location and the circumferential direction of the tire is denoted as θ1 = 60° (e.g., ...). Figure 1 ).

[0026] The second step involves using a tire X-ray inspection device to scan the tire with the metal patch attached in the first step and generate an image.

[0027] The third step is to import the image generated in the second step into the CAD software. First, draw a 1mm-2mm line segment L along a long boundary of the shadow of the reference object at the target location. y1 Then from line segment L y1 Starting from one end point, draw a line segment L of 1mm-2mm along the circumference of the tire. z1 The angle formed by the two line segments is an acute angle. Finally, the angle formed by each reference line segment and the tire circumferential line segment at the target position is measured and recorded as θ. 11 (like Figure 2 Then calculate the angular deviation of each reference object as Δθ. n :

[0028] Δθ1=θ 11 ―θ1=72.1―60=12.1°

[0029] If there are multiple reference objects, the angle deviation Δθ n Determined according to the following formula:

[0030]

[0031] The fourth step is to create a 1mm-2mm line segment L′ along the same layer of the shading band at the target location in the CAD software. yi Then, starting from one end of the line segment, draw a line segment L′ of 1mm-2mm along the circumference of the tire. zi Finally, the angle formed by each belt segment and the target position of the tire circumferential segment is measured and recorded as α. ni (like Figure 3The actual angle α′ of the belt can be calculated based on the angle change difference obtained in step three. ni :

[0032] α′ 11 =α 11 ―Δθ1=41.7―12.1=29.6°

[0033] The above steps can be used to measure the belt layer angle at the target position of a radial tire.

[0034] Currently, tire manufacturers require at least one day to perform a high-quality dissection of the tire belt, and the tire must be scrapped after the test. The method described in this patent application completes the entire test in approximately two hours without causing any damage to the tire. This significantly reduces time and economic costs, and markedly improves efficiency. Since this patented method does not cause any damage to the tire and the tire belt angle does not change in any shape, it can accurately measure the actual angle of the belt within the complete tire.

[0035] The foregoing description of embodiments of the present invention, through which those skilled in the art are able to implement or use the present invention, will be readily apparent to those skilled in the art. 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 invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novelty disclosed herein.

Claims

1. A method for measuring the belt layer angle of a radial tire, characterized in that, The method includes the following steps: The first step is to attach n thin, X-ray-impenetrable reference strips (n ≥ 1) along the tire's axis to the tire tread. The angle formed by one side of each reference strip at the target location and the tire's circumferential direction is denoted as _____. ; The second step is to use a tire X-ray tire inspection device to scan the tire with the reference object attached in the first step and generate an image; The third step is to import the image generated in the second step into the CAD software; first, draw a 1mm-2mm line segment L along a long boundary of the shadow of the reference object at the target location. yi Then from line segment L yi Starting from one end point, draw a line segment L of 1mm-2mm along the circumference of the tire. zi The angle formed by the two line segments is an acute angle. Finally, the angle formed by each reference line segment and the tire circumferential line segment at the target position is measured and recorded as follows: Then calculate the angular deviation of each reference object as follows: : The fourth step is to create a 1mm-2mm line segment along the same layer of shading at the target location in the CAD software. Then, starting from one end of the line segment, draw a line segment 1mm-2mm along the circumference of the tire. Finally, the angle formed by each belt segment and the target position of the tire circumferential segment is measured and recorded as follows: The actual angle of the belt can be calculated based on the angle change difference obtained in step three. : The above steps can be used to measure the belt layer angle at the target position of a radial tire.

2. The method for measuring the belt layer angle of a radial tire according to claim 1, characterized in that, The width of the slender reference object is less than 20mm, and the length of one side at the target location is 1mm-2mm.

3. The method for measuring the belt layer angle of a radial tire according to claim 1, characterized in that, If there are multiple reference objects, the angle deviation will be... Determined according to the following formula: 。 4. A device for measuring the belt layer angle of a radial tire, characterized in that, The device includes a slender strip reference object that cannot be penetrated by X-rays, an X-ray tire inspection device, and a computer. The measuring device uses the method described in any one of claims 1-3 to measure the belt layer angle of a radial tire.

5. A computer device, comprising a memory, a processor, and a computer program stored in the memory, characterized in that, The processor executes the computer program to implement steps three to four of the method according to any one of claims 1-3.

6. A computer-readable storage medium having a computer program or instructions stored thereon, characterized in that, When the computer program or instructions are executed by the processor, they implement steps three to four of the method described in any one of claims 1-3.

7. A computer program product, comprising a computer program or instructions, characterized in that, When the computer program or instructions are executed by the processor, they implement steps three to four of the method described in any one of claims 1-3.

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