CN111735725B

CN111735725B - Method for detecting performance of sizing material

Info

Publication number: CN111735725B
Application number: CN202010641218.0A
Authority: CN
Inventors: 刘东鹏; 汤汝松
Original assignee: Cheng Shin Tire and Rubber China Co Ltd
Current assignee: Cheng Shin Tire and Rubber China Co Ltd
Priority date: 2020-07-06
Filing date: 2020-07-06
Publication date: 2023-04-18
Anticipated expiration: 2040-07-06
Also published as: CN111735725A

Abstract

The invention provides a method for detecting the performance of sizing materials, which comprises the following steps: cutting the tire into sections comprising a portion of the tire tread, complete PAD, bead portion and tire bead; and fixing the slices on a clamp, and rapidly and reciprocally buckling the slices by using a fixed deformation amount until the slices are broken. The method for detecting the performance of the rubber material detects the performance of the PAD part of the tire by the actual tire slice, and is close to reality, accurate and rapid.

Description

Method for detecting performance of sizing material

Technical Field

The invention relates to the technical field of tire performance detection, in particular to a method for detecting the performance of sizing materials.

Background

Rubber compounds are important raw materials for automobile tires, which determine the service properties of the tires. As shown in fig. 1, fig. 1 is a photograph of a tire slice; wherein PAD refers broadly to the portion of the tire inside the tire curtain and outside the inner rubber, a rubber compound with high hardness properties that maintains the tire shape when the tire loses wind pressure (air leak) allowing the vehicle to continue to travel a distance (80 km).

The general detection of the rubber material is carried out by an ASTM/JIS test method, namely, the corresponding rubber material is vulcanized into a rubber block with the length of 150mm, the width of 25mm and the thickness of 6.5mm, the two ends of the rubber block are clamped for repeatedly stretching at a high speed, and the damage condition of the rubber block is observed to judge the performance of the rubber material. The method for manufacturing the rubber material for manufacturing the PAD by using the test piece and detecting the performance of the rubber material according to the specifications of ASTM or JIS is also a common method for detecting the performance of the rubber material, and the method has the defects that: 1) The method is a laboratory small-scale test, the tire is a structural body consisting of a plurality of parts, the linkage process of each part is complex in the operation condition, the actual performance expression cannot be accurately described by a single test method, and only a trend can be found out; 2) It is necessary to manufacture a mold conforming to the ASTM or JIS standard, which is complicated and increases the cost. The road test of a real vehicle is also a method for detecting sizing material, and the method has the following defects: 1) The real vehicle is used for testing, manpower and automobile expenses need to be paid, and research cost is greatly increased for tire factories; 2) The real vehicle is used for testing, the vehicle and experiment time needs to be arranged, the detection process is long in time consumption, and the process is complicated.

Therefore, in order to simulate the PAD rubber damage condition in the actual use process of the tire, it is necessary to provide a close-to-reality, accurate and quick rubber material performance detection method.

Disclosure of Invention

The invention aims to provide a method for detecting rubber materials, which can be close to reality and accurately and quickly realize the detection of the rubber materials.

The application provides a method for detecting sizing materials, which comprises the steps of firstly cutting a tire into slices comprising PAD, fixing the slices on a clamp, and rapidly and reciprocally buckling the slices by a fixed deformation amount until the slices are broken; according to the detection method, the slice after being damaged by punching and cutting marks is subjected to reciprocating buckling deformation, the damage form possibly existing when the explosion-proof tire is in an air shortage state or when the tire bead part is subjected to violent impact is greatly simulated, the performance of the rubber material can be detected more accurately and quickly, the quality of the slice is judged, and the tire or the formula corresponding to the slice is optimized, so that the tire performance development efficiency is improved.

Drawings

FIG. 1 is a photograph of a tire section of the present invention;

FIG. 2 is a schematic view of a tire slice and portion of the present invention;

FIG. 3 is a schematic view of a fixture and a slice for the method of detecting a sizing material according to the present invention;

FIG. 4 is a perforation fracture tendency chart under different sizing material detection methods;

FIG. 5 is a graph of the knife-cut fracture tendency under different sizing material detection methods.

Detailed Description

For a further understanding of the invention, reference will now be made to the preferred embodiments of the invention by way of example, and it is to be understood that the description is intended to further illustrate features and advantages of the invention, and not to limit the scope of the claims.

In view of the problems of the rubber material detection method ASTM/JIS experimental method, the application provides a realistic, accurate and rapid rubber material performance detection method, which detects the performance of the PAD part of the tire by actual tire slices; specifically, the embodiment of the invention discloses a method for detecting the performance of a sizing material, which comprises the following steps:

cutting the tire into sections comprising a portion of the tire tread, complete PAD, bead portion and tire bead;

fixing the slices on a clamp, and rapidly and reciprocally buckling the slices by a fixed deformation amount until the slices are broken;

the fixed deformation specifically comprises the following steps:

the holes punched in the PAD glue in the slices are 1-5 mm, the deformation is 10-40%, and the deformation frequency is more than 1 ten thousand times; the cutting mark of the cutting is 1-5 mm, the deformation is 10-40%, and the deformation times are more than 1 ten thousand.

In the method for detecting the performance of the rubber compound, the tire is firstly cut into slices, and the slices comprise partial tire treads, complete PADs, bead parts and tire beads; the slice simultaneously comprises the four parts, so that the performance of the rubber material can be accurately evaluated, and finally the related performance of the tire is improved. The ratio of the length to the width of the slice is (5-8): 1, and in a specific embodiment, the ratio of the length to the width of the slice is 6:1.

This application then will be cut into slices and be fixed in on the anchor clamps, wherein sliced both ends are fixed in respectively the last anchor clamps and the lower anchor clamps of anchor clamps, go up the anchor clamps with the lower anchor clamps are specifically as shown in fig. 3 to sliced fixed. This application anchor clamps can realize stablizing fixedly to the section, can not influence section reciprocating motion.

After the slices are fixed, the slices are quickly bent back and forth by a fixed deformation amount until the slices are broken, and therefore the detection of the sizing material performance is completed. In the process, the fixed deformation in the fixed deformation specifically refers to punching and cutting the PAD part of the slice, the punched holes are 1-5 mm, the deformation is 10-40%, and the deformation times are more than 1 ten thousand; the cutting mark of the knife cutting is 1-5 mm, the deformation is 10-40%, and the deformation frequency is more than 1 ten thousand times; in a specific embodiment, the holes are 3-4 mm, the deformation is 20-30%, and the times are more than or equal to 2 ten thousand; the cutting mark is 3-4 mm, the deformation is 20-30%, and the times are more than or equal to 2 ten thousand. The punching position is 8-12 mm from the center of the slice in the length direction, and the cutting mark position is 8-12 mm from the center of the slice in the length direction; in a specific embodiment, the punching position is 10mm away from the slice center in the length direction, and the cutting mark position is 10mm away from the slice center; as shown in particular in fig. 2. And further carrying out rapid reciprocating buckling on the slices on the basis of the deformation of the slices until the slices are broken. When the performance of the rubber material is specifically evaluated, the slices under the same conditions (large holes, size of cutting marks and deformation) can be detected, the slice is judged to be good or bad according to the detection result, namely the pore diameter change and the cutting mark length change, and then the tire or the formula corresponding to the slice can be optimized, so that the research and development efficiency of the performance of the tire is improved, and the development cost is reduced.

The explosion-proof tire can cause the PAD position to generate the damage form when the tire is in a short-air state or the tire edge position has violent impact, and because the design of the explosion-proof tire is greatly different from that of other tires, the conventional detection items are difficult to achieve the correlation with the actual use, such as heat build-up, tearing property, hardness, ageing property and the like, and cannot show the actual performance and the use condition of the tire, thereby greatly influencing the later use and the development period of the tire. According to the invention, through a reverse experiment, namely punching and cutting marks on the PAD part, the performance of the rubber material is closer to reality, the rubber material has higher relevance, and the risk and the development period can be greatly reduced in development.

For further understanding of the present invention, the following examples are provided to illustrate the method for measuring properties of rubber compounds of the present invention, and the scope of the present invention is not limited by the following examples.

Examples

A) Test conditions and PAD performance verification

Tire vulcanization conditions: the test was carried out after vulcanizing the tire at 180 ℃ for 10 minutes;

control test: the PAD rubber material performance test of the tire is carried out on a common passenger car by using a 245/50R18 explosion-proof tire with the specification on a common road;

tire section test: the tire is cut into slices with the width of 25mm, and the slices are used for testing, wherein the range of the slices is partial tire tread, complete PAD, tire bead position and tire bead; fixing the tire slice by a specially designed clamp (such as the clamp shown in fig. 3), and rapidly and reciprocally flexing the tire test piece by a fixed deformation and a certain speed; the buckling rate is 80-120 times/min;

the size of a hole punched by the tire PAD adhesive is 3-4 mm, the deformation is 20-30%, and the number of times is twenty thousand or more until the test piece is broken;

the size of a cutting mark of the tire PAD rubber cutter cutting is 3-4 mm, the deformation is 20-30%, and the times are twenty-thousand or more until the test piece is broken;

b) The results of the experiments are shown in table 1, the tendency of perforation and knife-cut fracture is shown in figures 4 and 5,

table 1 fracture data table of rubber compounds by different detection methods

Degree of cracking: the amount of growth compared to the original hole/knife cut size;

standard test methods: GB T13934-2006 determination of flex and tear growth in vulcanized or thermoplastic rubber.

As can be seen from table 1, fig. 4 and fig. 5, the compound testing method of the present application is closer to the results of the real vehicle tests in terms of the fracture tendency.

The above description of the embodiments is only intended to facilitate the understanding of the method of the invention and its core idea. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention 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.

Claims

1. A method for detecting the performance of sizing materials comprises the following steps:

the fixed deformation specifically comprises the following steps:

the holes punched in the PAD glue in the slices are 1-5 mm, the deformation is 10-40%, and the deformation frequency is more than 1 ten thousand times; the cutting mark of the knife cutting is 1-5 mm, the deformation is 10-40%, and the deformation frequency is more than 1 ten thousand times;

the punching position is 8-12 mm from the center of the slice in the length direction, and the cutting mark position is 8-12 mm from the center of the slice in the length direction.

2. The detection method according to claim 1, wherein the ratio of the length to the width of the slice is (5-8): 1.

3. The detection method according to claim 1, wherein the rate of buckling is 80 to 120 times/min.

4. The inspection method according to claim 1, wherein the tire is a tire vulcanized at 150 to 200 ℃ for 10 to 20 minutes.

5. The detection method according to claim 1, wherein the hole is 3-4 mm, the deformation is 20-30%, and the number of times is not less than 2 ten thousand.

6. The detection method according to claim 1, wherein the cut mark is 3-4 mm, the deformation is 20-30%, and the number of times is not less than 2 ten thousand.